/*
- * Driver for 8250/16550-type serial ports
+ * Universal/legacy driver for 8250/16550-type serial ports
*
* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
*
* Copyright (C) 2001 Russell King.
*
+ * Supports: ISA-compatible 8250/16550 ports
+ * PNP 8250/16550 ports
+ * early_serial_setup() ports
+ * userspace-configurable "phantom" ports
+ * "serial8250" platform devices
+ * serial8250_register_8250_port() ports
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
- *
- * A note about mapbase / membase
- *
- * mapbase is the physical address of the IO port.
- * membase is an 'ioremapped' cookie.
*/
-#if defined(CONFIG_SERIAL_8250_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/ioport.h>
static struct uart_driver serial8250_reg;
-static int serial_index(struct uart_port *port)
-{
- return port->minor - 64;
-}
-
static unsigned int skip_txen_test; /* force skip of txen test at init time */
-/*
- * Debugging.
- */
-#if 0
-#define DEBUG_AUTOCONF(fmt...) printk(fmt)
-#else
-#define DEBUG_AUTOCONF(fmt...) do { } while (0)
-#endif
-
-#if 0
-#define DEBUG_INTR(fmt...) printk(fmt)
-#else
-#define DEBUG_INTR(fmt...) do { } while (0)
-#endif
-
#define PASS_LIMIT 512
-#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
-
-
#include <asm/serial.h>
/*
* SERIAL_PORT_DFNS tells us about built-in ports that have no
static DEFINE_MUTEX(hash_mutex); /* Used to walk the hash */
/*
- * Here we define the default xmit fifo size used for each type of UART.
+ * This is the serial driver's interrupt routine.
+ *
+ * Arjan thinks the old way was overly complex, so it got simplified.
+ * Alan disagrees, saying that need the complexity to handle the weird
+ * nature of ISA shared interrupts. (This is a special exception.)
+ *
+ * In order to handle ISA shared interrupts properly, we need to check
+ * that all ports have been serviced, and therefore the ISA interrupt
+ * line has been de-asserted.
+ *
+ * This means we need to loop through all ports. checking that they
+ * don't have an interrupt pending.
*/
-static const struct serial8250_config uart_config[] = {
- [PORT_UNKNOWN] = {
- .name = "unknown",
- .fifo_size = 1,
- .tx_loadsz = 1,
- },
- [PORT_8250] = {
- .name = "8250",
- .fifo_size = 1,
- .tx_loadsz = 1,
- },
- [PORT_16450] = {
- .name = "16450",
- .fifo_size = 1,
- .tx_loadsz = 1,
- },
- [PORT_16550] = {
- .name = "16550",
- .fifo_size = 1,
- .tx_loadsz = 1,
- },
- [PORT_16550A] = {
- .name = "16550A",
- .fifo_size = 16,
- .tx_loadsz = 16,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- .rxtrig_bytes = {1, 4, 8, 14},
- .flags = UART_CAP_FIFO,
- },
- [PORT_CIRRUS] = {
- .name = "Cirrus",
- .fifo_size = 1,
- .tx_loadsz = 1,
- },
- [PORT_16650] = {
- .name = "ST16650",
- .fifo_size = 1,
- .tx_loadsz = 1,
- .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP,
- },
- [PORT_16650V2] = {
- .name = "ST16650V2",
- .fifo_size = 32,
- .tx_loadsz = 16,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 |
- UART_FCR_T_TRIG_00,
- .rxtrig_bytes = {8, 16, 24, 28},
- .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP,
- },
- [PORT_16750] = {
- .name = "TI16750",
- .fifo_size = 64,
- .tx_loadsz = 64,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 |
- UART_FCR7_64BYTE,
- .rxtrig_bytes = {1, 16, 32, 56},
- .flags = UART_CAP_FIFO | UART_CAP_SLEEP | UART_CAP_AFE,
- },
- [PORT_STARTECH] = {
- .name = "Startech",
- .fifo_size = 1,
- .tx_loadsz = 1,
- },
- [PORT_16C950] = {
- .name = "16C950/954",
- .fifo_size = 128,
- .tx_loadsz = 128,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- /* UART_CAP_EFR breaks billionon CF bluetooth card. */
- .flags = UART_CAP_FIFO | UART_CAP_SLEEP,
- },
- [PORT_16654] = {
- .name = "ST16654",
- .fifo_size = 64,
- .tx_loadsz = 32,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 |
- UART_FCR_T_TRIG_10,
- .rxtrig_bytes = {8, 16, 56, 60},
- .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP,
- },
- [PORT_16850] = {
- .name = "XR16850",
- .fifo_size = 128,
- .tx_loadsz = 128,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP,
- },
- [PORT_RSA] = {
- .name = "RSA",
- .fifo_size = 2048,
- .tx_loadsz = 2048,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11,
- .flags = UART_CAP_FIFO,
- },
- [PORT_NS16550A] = {
- .name = "NS16550A",
- .fifo_size = 16,
- .tx_loadsz = 16,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- .flags = UART_CAP_FIFO | UART_NATSEMI,
- },
- [PORT_XSCALE] = {
- .name = "XScale",
- .fifo_size = 32,
- .tx_loadsz = 32,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- .flags = UART_CAP_FIFO | UART_CAP_UUE | UART_CAP_RTOIE,
- },
- [PORT_OCTEON] = {
- .name = "OCTEON",
- .fifo_size = 64,
- .tx_loadsz = 64,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- .flags = UART_CAP_FIFO,
- },
- [PORT_AR7] = {
- .name = "AR7",
- .fifo_size = 16,
- .tx_loadsz = 16,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_00,
- .flags = UART_CAP_FIFO | UART_CAP_AFE,
- },
- [PORT_U6_16550A] = {
- .name = "U6_16550A",
- .fifo_size = 64,
- .tx_loadsz = 64,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- .flags = UART_CAP_FIFO | UART_CAP_AFE,
- },
- [PORT_TEGRA] = {
- .name = "Tegra",
- .fifo_size = 32,
- .tx_loadsz = 8,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 |
- UART_FCR_T_TRIG_01,
- .rxtrig_bytes = {1, 4, 8, 14},
- .flags = UART_CAP_FIFO | UART_CAP_RTOIE,
- },
- [PORT_XR17D15X] = {
- .name = "XR17D15X",
- .fifo_size = 64,
- .tx_loadsz = 64,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR |
- UART_CAP_SLEEP,
- },
- [PORT_XR17V35X] = {
- .name = "XR17V35X",
- .fifo_size = 256,
- .tx_loadsz = 256,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11 |
- UART_FCR_T_TRIG_11,
- .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR |
- UART_CAP_SLEEP,
- },
- [PORT_LPC3220] = {
- .name = "LPC3220",
- .fifo_size = 64,
- .tx_loadsz = 32,
- .fcr = UART_FCR_DMA_SELECT | UART_FCR_ENABLE_FIFO |
- UART_FCR_R_TRIG_00 | UART_FCR_T_TRIG_00,
- .flags = UART_CAP_FIFO,
- },
- [PORT_BRCM_TRUMANAGE] = {
- .name = "TruManage",
- .fifo_size = 1,
- .tx_loadsz = 1024,
- .flags = UART_CAP_HFIFO,
- },
- [PORT_8250_CIR] = {
- .name = "CIR port"
- },
- [PORT_ALTR_16550_F32] = {
- .name = "Altera 16550 FIFO32",
- .fifo_size = 32,
- .tx_loadsz = 32,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- .flags = UART_CAP_FIFO | UART_CAP_AFE,
- },
- [PORT_ALTR_16550_F64] = {
- .name = "Altera 16550 FIFO64",
- .fifo_size = 64,
- .tx_loadsz = 64,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- .flags = UART_CAP_FIFO | UART_CAP_AFE,
- },
- [PORT_ALTR_16550_F128] = {
- .name = "Altera 16550 FIFO128",
- .fifo_size = 128,
- .tx_loadsz = 128,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- .flags = UART_CAP_FIFO | UART_CAP_AFE,
- },
-/* tx_loadsz is set to 63-bytes instead of 64-bytes to implement
-workaround of errata A-008006 which states that tx_loadsz should be
-configured less than Maximum supported fifo bytes */
- [PORT_16550A_FSL64] = {
- .name = "16550A_FSL64",
- .fifo_size = 64,
- .tx_loadsz = 63,
- .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 |
- UART_FCR7_64BYTE,
- .flags = UART_CAP_FIFO,
- },
-};
-
-/* Uart divisor latch read */
-static int default_serial_dl_read(struct uart_8250_port *up)
-{
- return serial_in(up, UART_DLL) | serial_in(up, UART_DLM) << 8;
-}
-
-/* Uart divisor latch write */
-static void default_serial_dl_write(struct uart_8250_port *up, int value)
-{
- serial_out(up, UART_DLL, value & 0xff);
- serial_out(up, UART_DLM, value >> 8 & 0xff);
-}
-
-#if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X)
-
-/* Au1x00/RT288x UART hardware has a weird register layout */
-static const s8 au_io_in_map[8] = {
- 0, /* UART_RX */
- 2, /* UART_IER */
- 3, /* UART_IIR */
- 5, /* UART_LCR */
- 6, /* UART_MCR */
- 7, /* UART_LSR */
- 8, /* UART_MSR */
- -1, /* UART_SCR (unmapped) */
-};
-
-static const s8 au_io_out_map[8] = {
- 1, /* UART_TX */
- 2, /* UART_IER */
- 4, /* UART_FCR */
- 5, /* UART_LCR */
- 6, /* UART_MCR */
- -1, /* UART_LSR (unmapped) */
- -1, /* UART_MSR (unmapped) */
- -1, /* UART_SCR (unmapped) */
-};
-
-static unsigned int au_serial_in(struct uart_port *p, int offset)
-{
- if (offset >= ARRAY_SIZE(au_io_in_map))
- return UINT_MAX;
- offset = au_io_in_map[offset];
- if (offset < 0)
- return UINT_MAX;
- return __raw_readl(p->membase + (offset << p->regshift));
-}
-
-static void au_serial_out(struct uart_port *p, int offset, int value)
-{
- if (offset >= ARRAY_SIZE(au_io_out_map))
- return;
- offset = au_io_out_map[offset];
- if (offset < 0)
- return;
- __raw_writel(value, p->membase + (offset << p->regshift));
-}
-
-/* Au1x00 haven't got a standard divisor latch */
-static int au_serial_dl_read(struct uart_8250_port *up)
+static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
{
- return __raw_readl(up->port.membase + 0x28);
-}
+ struct irq_info *i = dev_id;
+ struct list_head *l, *end = NULL;
+ int pass_counter = 0, handled = 0;
-static void au_serial_dl_write(struct uart_8250_port *up, int value)
-{
- __raw_writel(value, up->port.membase + 0x28);
-}
+ DEBUG_INTR("serial8250_interrupt(%d)...", irq);
-#endif
+ spin_lock(&i->lock);
-static unsigned int hub6_serial_in(struct uart_port *p, int offset)
-{
- offset = offset << p->regshift;
- outb(p->hub6 - 1 + offset, p->iobase);
- return inb(p->iobase + 1);
-}
+ l = i->head;
+ do {
+ struct uart_8250_port *up;
+ struct uart_port *port;
-static void hub6_serial_out(struct uart_port *p, int offset, int value)
-{
- offset = offset << p->regshift;
- outb(p->hub6 - 1 + offset, p->iobase);
- outb(value, p->iobase + 1);
-}
+ up = list_entry(l, struct uart_8250_port, list);
+ port = &up->port;
-static unsigned int mem_serial_in(struct uart_port *p, int offset)
-{
- offset = offset << p->regshift;
- return readb(p->membase + offset);
-}
+ if (port->handle_irq(port)) {
+ handled = 1;
+ end = NULL;
+ } else if (end == NULL)
+ end = l;
-static void mem_serial_out(struct uart_port *p, int offset, int value)
-{
- offset = offset << p->regshift;
- writeb(value, p->membase + offset);
-}
+ l = l->next;
-static void mem32_serial_out(struct uart_port *p, int offset, int value)
-{
- offset = offset << p->regshift;
- writel(value, p->membase + offset);
-}
+ if (l == i->head && pass_counter++ > PASS_LIMIT) {
+ /* If we hit this, we're dead. */
+ printk_ratelimited(KERN_ERR
+ "serial8250: too much work for irq%d\n", irq);
+ break;
+ }
+ } while (l != end);
-static unsigned int mem32_serial_in(struct uart_port *p, int offset)
-{
- offset = offset << p->regshift;
- return readl(p->membase + offset);
-}
+ spin_unlock(&i->lock);
-static void mem32be_serial_out(struct uart_port *p, int offset, int value)
-{
- offset = offset << p->regshift;
- iowrite32be(value, p->membase + offset);
-}
+ DEBUG_INTR("end.\n");
-static unsigned int mem32be_serial_in(struct uart_port *p, int offset)
-{
- offset = offset << p->regshift;
- return ioread32be(p->membase + offset);
+ return IRQ_RETVAL(handled);
}
-static unsigned int io_serial_in(struct uart_port *p, int offset)
+/*
+ * To support ISA shared interrupts, we need to have one interrupt
+ * handler that ensures that the IRQ line has been deasserted
+ * before returning. Failing to do this will result in the IRQ
+ * line being stuck active, and, since ISA irqs are edge triggered,
+ * no more IRQs will be seen.
+ */
+static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up)
{
- offset = offset << p->regshift;
- return inb(p->iobase + offset);
-}
+ spin_lock_irq(&i->lock);
-static void io_serial_out(struct uart_port *p, int offset, int value)
-{
- offset = offset << p->regshift;
- outb(value, p->iobase + offset);
+ if (!list_empty(i->head)) {
+ if (i->head == &up->list)
+ i->head = i->head->next;
+ list_del(&up->list);
+ } else {
+ BUG_ON(i->head != &up->list);
+ i->head = NULL;
+ }
+ spin_unlock_irq(&i->lock);
+ /* List empty so throw away the hash node */
+ if (i->head == NULL) {
+ hlist_del(&i->node);
+ kfree(i);
+ }
}
-static int serial8250_default_handle_irq(struct uart_port *port);
-static int exar_handle_irq(struct uart_port *port);
-
-static void set_io_from_upio(struct uart_port *p)
+static int serial_link_irq_chain(struct uart_8250_port *up)
{
- struct uart_8250_port *up = up_to_u8250p(p);
-
- up->dl_read = default_serial_dl_read;
- up->dl_write = default_serial_dl_write;
+ struct hlist_head *h;
+ struct hlist_node *n;
+ struct irq_info *i;
+ int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0;
- switch (p->iotype) {
- case UPIO_HUB6:
- p->serial_in = hub6_serial_in;
- p->serial_out = hub6_serial_out;
- break;
+ mutex_lock(&hash_mutex);
- case UPIO_MEM:
- p->serial_in = mem_serial_in;
- p->serial_out = mem_serial_out;
- break;
+ h = &irq_lists[up->port.irq % NR_IRQ_HASH];
- case UPIO_MEM32:
- p->serial_in = mem32_serial_in;
- p->serial_out = mem32_serial_out;
- break;
+ hlist_for_each(n, h) {
+ i = hlist_entry(n, struct irq_info, node);
+ if (i->irq == up->port.irq)
+ break;
+ }
- case UPIO_MEM32BE:
- p->serial_in = mem32be_serial_in;
- p->serial_out = mem32be_serial_out;
- break;
+ if (n == NULL) {
+ i = kzalloc(sizeof(struct irq_info), GFP_KERNEL);
+ if (i == NULL) {
+ mutex_unlock(&hash_mutex);
+ return -ENOMEM;
+ }
+ spin_lock_init(&i->lock);
+ i->irq = up->port.irq;
+ hlist_add_head(&i->node, h);
+ }
+ mutex_unlock(&hash_mutex);
-#if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X)
- case UPIO_AU:
- p->serial_in = au_serial_in;
- p->serial_out = au_serial_out;
- up->dl_read = au_serial_dl_read;
- up->dl_write = au_serial_dl_write;
- break;
-#endif
+ spin_lock_irq(&i->lock);
- default:
- p->serial_in = io_serial_in;
- p->serial_out = io_serial_out;
- break;
- }
- /* Remember loaded iotype */
- up->cur_iotype = p->iotype;
- p->handle_irq = serial8250_default_handle_irq;
-}
+ if (i->head) {
+ list_add(&up->list, i->head);
+ spin_unlock_irq(&i->lock);
-static void
-serial_port_out_sync(struct uart_port *p, int offset, int value)
-{
- switch (p->iotype) {
- case UPIO_MEM:
- case UPIO_MEM32:
- case UPIO_MEM32BE:
- case UPIO_AU:
- p->serial_out(p, offset, value);
- p->serial_in(p, UART_LCR); /* safe, no side-effects */
- break;
- default:
- p->serial_out(p, offset, value);
+ ret = 0;
+ } else {
+ INIT_LIST_HEAD(&up->list);
+ i->head = &up->list;
+ spin_unlock_irq(&i->lock);
+ irq_flags |= up->port.irqflags;
+ ret = request_irq(up->port.irq, serial8250_interrupt,
+ irq_flags, "serial", i);
+ if (ret < 0)
+ serial_do_unlink(i, up);
}
-}
-/*
- * For the 16C950
- */
-static void serial_icr_write(struct uart_8250_port *up, int offset, int value)
-{
- serial_out(up, UART_SCR, offset);
- serial_out(up, UART_ICR, value);
+ return ret;
}
-static unsigned int serial_icr_read(struct uart_8250_port *up, int offset)
+static void serial_unlink_irq_chain(struct uart_8250_port *up)
{
- unsigned int value;
+ /*
+ * yes, some broken gcc emit "warning: 'i' may be used uninitialized"
+ * but no, we are not going to take a patch that assigns NULL below.
+ */
+ struct irq_info *i;
+ struct hlist_node *n;
+ struct hlist_head *h;
- serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);
- serial_out(up, UART_SCR, offset);
- value = serial_in(up, UART_ICR);
- serial_icr_write(up, UART_ACR, up->acr);
+ mutex_lock(&hash_mutex);
- return value;
-}
+ h = &irq_lists[up->port.irq % NR_IRQ_HASH];
-/*
- * FIFO support.
- */
-static void serial8250_clear_fifos(struct uart_8250_port *p)
-{
- if (p->capabilities & UART_CAP_FIFO) {
- serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO);
- serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO |
- UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
- serial_out(p, UART_FCR, 0);
+ hlist_for_each(n, h) {
+ i = hlist_entry(n, struct irq_info, node);
+ if (i->irq == up->port.irq)
+ break;
}
-}
-void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p)
-{
- serial8250_clear_fifos(p);
- serial_out(p, UART_FCR, p->fcr);
-}
-EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos);
+ BUG_ON(n == NULL);
+ BUG_ON(i->head == NULL);
-void serial8250_rpm_get(struct uart_8250_port *p)
-{
- if (!(p->capabilities & UART_CAP_RPM))
- return;
- pm_runtime_get_sync(p->port.dev);
-}
-EXPORT_SYMBOL_GPL(serial8250_rpm_get);
+ if (list_empty(i->head))
+ free_irq(up->port.irq, i);
-void serial8250_rpm_put(struct uart_8250_port *p)
-{
- if (!(p->capabilities & UART_CAP_RPM))
- return;
- pm_runtime_mark_last_busy(p->port.dev);
- pm_runtime_put_autosuspend(p->port.dev);
+ serial_do_unlink(i, up);
+ mutex_unlock(&hash_mutex);
}
-EXPORT_SYMBOL_GPL(serial8250_rpm_put);
/*
- * These two wrappers ensure that enable_runtime_pm_tx() can be called more than
- * once and disable_runtime_pm_tx() will still disable RPM because the fifo is
- * empty and the HW can idle again.
+ * This function is used to handle ports that do not have an
+ * interrupt. This doesn't work very well for 16450's, but gives
+ * barely passable results for a 16550A. (Although at the expense
+ * of much CPU overhead).
*/
-static void serial8250_rpm_get_tx(struct uart_8250_port *p)
+static void serial8250_timeout(unsigned long data)
{
- unsigned char rpm_active;
-
- if (!(p->capabilities & UART_CAP_RPM))
- return;
+ struct uart_8250_port *up = (struct uart_8250_port *)data;
- rpm_active = xchg(&p->rpm_tx_active, 1);
- if (rpm_active)
- return;
- pm_runtime_get_sync(p->port.dev);
+ up->port.handle_irq(&up->port);
+ mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port));
}
-static void serial8250_rpm_put_tx(struct uart_8250_port *p)
+static void serial8250_backup_timeout(unsigned long data)
{
- unsigned char rpm_active;
+ struct uart_8250_port *up = (struct uart_8250_port *)data;
+ unsigned int iir, ier = 0, lsr;
+ unsigned long flags;
- if (!(p->capabilities & UART_CAP_RPM))
- return;
-
- rpm_active = xchg(&p->rpm_tx_active, 0);
- if (!rpm_active)
- return;
- pm_runtime_mark_last_busy(p->port.dev);
- pm_runtime_put_autosuspend(p->port.dev);
-}
-
-/*
- * IER sleep support. UARTs which have EFRs need the "extended
- * capability" bit enabled. Note that on XR16C850s, we need to
- * reset LCR to write to IER.
- */
-static void serial8250_set_sleep(struct uart_8250_port *p, int sleep)
-{
- unsigned char lcr = 0, efr = 0;
- /*
- * Exar UARTs have a SLEEP register that enables or disables
- * each UART to enter sleep mode separately. On the XR17V35x the
- * register is accessible to each UART at the UART_EXAR_SLEEP
- * offset but the UART channel may only write to the corresponding
- * bit.
- */
- serial8250_rpm_get(p);
- if ((p->port.type == PORT_XR17V35X) ||
- (p->port.type == PORT_XR17D15X)) {
- serial_out(p, UART_EXAR_SLEEP, sleep ? 0xff : 0);
- goto out;
- }
-
- if (p->capabilities & UART_CAP_SLEEP) {
- if (p->capabilities & UART_CAP_EFR) {
- lcr = serial_in(p, UART_LCR);
- efr = serial_in(p, UART_EFR);
- serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B);
- serial_out(p, UART_EFR, UART_EFR_ECB);
- serial_out(p, UART_LCR, 0);
- }
- serial_out(p, UART_IER, sleep ? UART_IERX_SLEEP : 0);
- if (p->capabilities & UART_CAP_EFR) {
- serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B);
- serial_out(p, UART_EFR, efr);
- serial_out(p, UART_LCR, lcr);
- }
- }
-out:
- serial8250_rpm_put(p);
-}
-
-#ifdef CONFIG_SERIAL_8250_RSA
-/*
- * Attempts to turn on the RSA FIFO. Returns zero on failure.
- * We set the port uart clock rate if we succeed.
- */
-static int __enable_rsa(struct uart_8250_port *up)
-{
- unsigned char mode;
- int result;
-
- mode = serial_in(up, UART_RSA_MSR);
- result = mode & UART_RSA_MSR_FIFO;
-
- if (!result) {
- serial_out(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
- mode = serial_in(up, UART_RSA_MSR);
- result = mode & UART_RSA_MSR_FIFO;
- }
-
- if (result)
- up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
-
- return result;
-}
-
-static void enable_rsa(struct uart_8250_port *up)
-{
- if (up->port.type == PORT_RSA) {
- if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
- spin_lock_irq(&up->port.lock);
- __enable_rsa(up);
- spin_unlock_irq(&up->port.lock);
- }
- if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
- serial_out(up, UART_RSA_FRR, 0);
- }
-}
-
-/*
- * Attempts to turn off the RSA FIFO. Returns zero on failure.
- * It is unknown why interrupts were disabled in here. However,
- * the caller is expected to preserve this behaviour by grabbing
- * the spinlock before calling this function.
- */
-static void disable_rsa(struct uart_8250_port *up)
-{
- unsigned char mode;
- int result;
-
- if (up->port.type == PORT_RSA &&
- up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
- spin_lock_irq(&up->port.lock);
-
- mode = serial_in(up, UART_RSA_MSR);
- result = !(mode & UART_RSA_MSR_FIFO);
-
- if (!result) {
- serial_out(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
- mode = serial_in(up, UART_RSA_MSR);
- result = !(mode & UART_RSA_MSR_FIFO);
- }
-
- if (result)
- up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
- spin_unlock_irq(&up->port.lock);
- }
-}
-#endif /* CONFIG_SERIAL_8250_RSA */
-
-/*
- * This is a quickie test to see how big the FIFO is.
- * It doesn't work at all the time, more's the pity.
- */
-static int size_fifo(struct uart_8250_port *up)
-{
- unsigned char old_fcr, old_mcr, old_lcr;
- unsigned short old_dl;
- int count;
-
- old_lcr = serial_in(up, UART_LCR);
- serial_out(up, UART_LCR, 0);
- old_fcr = serial_in(up, UART_FCR);
- old_mcr = serial_in(up, UART_MCR);
- serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
- UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
- serial_out(up, UART_MCR, UART_MCR_LOOP);
- serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
- old_dl = serial_dl_read(up);
- serial_dl_write(up, 0x0001);
- serial_out(up, UART_LCR, 0x03);
- for (count = 0; count < 256; count++)
- serial_out(up, UART_TX, count);
- mdelay(20);/* FIXME - schedule_timeout */
- for (count = 0; (serial_in(up, UART_LSR) & UART_LSR_DR) &&
- (count < 256); count++)
- serial_in(up, UART_RX);
- serial_out(up, UART_FCR, old_fcr);
- serial_out(up, UART_MCR, old_mcr);
- serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
- serial_dl_write(up, old_dl);
- serial_out(up, UART_LCR, old_lcr);
-
- return count;
-}
-
-/*
- * Read UART ID using the divisor method - set DLL and DLM to zero
- * and the revision will be in DLL and device type in DLM. We
- * preserve the device state across this.
- */
-static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p)
-{
- unsigned char old_dll, old_dlm, old_lcr;
- unsigned int id;
-
- old_lcr = serial_in(p, UART_LCR);
- serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A);
-
- old_dll = serial_in(p, UART_DLL);
- old_dlm = serial_in(p, UART_DLM);
-
- serial_out(p, UART_DLL, 0);
- serial_out(p, UART_DLM, 0);
-
- id = serial_in(p, UART_DLL) | serial_in(p, UART_DLM) << 8;
-
- serial_out(p, UART_DLL, old_dll);
- serial_out(p, UART_DLM, old_dlm);
- serial_out(p, UART_LCR, old_lcr);
-
- return id;
-}
-
-/*
- * This is a helper routine to autodetect StarTech/Exar/Oxsemi UART's.
- * When this function is called we know it is at least a StarTech
- * 16650 V2, but it might be one of several StarTech UARTs, or one of
- * its clones. (We treat the broken original StarTech 16650 V1 as a
- * 16550, and why not? Startech doesn't seem to even acknowledge its
- * existence.)
- *
- * What evil have men's minds wrought...
- */
-static void autoconfig_has_efr(struct uart_8250_port *up)
-{
- unsigned int id1, id2, id3, rev;
-
- /*
- * Everything with an EFR has SLEEP
- */
- up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP;
-
- /*
- * First we check to see if it's an Oxford Semiconductor UART.
- *
- * If we have to do this here because some non-National
- * Semiconductor clone chips lock up if you try writing to the
- * LSR register (which serial_icr_read does)
- */
-
- /*
- * Check for Oxford Semiconductor 16C950.
- *
- * EFR [4] must be set else this test fails.
- *
- * This shouldn't be necessary, but Mike Hudson (Exoray@isys.ca)
- * claims that it's needed for 952 dual UART's (which are not
- * recommended for new designs).
- */
- up->acr = 0;
- serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
- serial_out(up, UART_EFR, UART_EFR_ECB);
- serial_out(up, UART_LCR, 0x00);
- id1 = serial_icr_read(up, UART_ID1);
- id2 = serial_icr_read(up, UART_ID2);
- id3 = serial_icr_read(up, UART_ID3);
- rev = serial_icr_read(up, UART_REV);
-
- DEBUG_AUTOCONF("950id=%02x:%02x:%02x:%02x ", id1, id2, id3, rev);
-
- if (id1 == 0x16 && id2 == 0xC9 &&
- (id3 == 0x50 || id3 == 0x52 || id3 == 0x54)) {
- up->port.type = PORT_16C950;
-
- /*
- * Enable work around for the Oxford Semiconductor 952 rev B
- * chip which causes it to seriously miscalculate baud rates
- * when DLL is 0.
- */
- if (id3 == 0x52 && rev == 0x01)
- up->bugs |= UART_BUG_QUOT;
- return;
- }
-
- /*
- * We check for a XR16C850 by setting DLL and DLM to 0, and then
- * reading back DLL and DLM. The chip type depends on the DLM
- * value read back:
- * 0x10 - XR16C850 and the DLL contains the chip revision.
- * 0x12 - XR16C2850.
- * 0x14 - XR16C854.
- */
- id1 = autoconfig_read_divisor_id(up);
- DEBUG_AUTOCONF("850id=%04x ", id1);
-
- id2 = id1 >> 8;
- if (id2 == 0x10 || id2 == 0x12 || id2 == 0x14) {
- up->port.type = PORT_16850;
- return;
- }
-
- /*
- * It wasn't an XR16C850.
- *
- * We distinguish between the '654 and the '650 by counting
- * how many bytes are in the FIFO. I'm using this for now,
- * since that's the technique that was sent to me in the
- * serial driver update, but I'm not convinced this works.
- * I've had problems doing this in the past. -TYT
- */
- if (size_fifo(up) == 64)
- up->port.type = PORT_16654;
- else
- up->port.type = PORT_16650V2;
-}
-
-/*
- * We detected a chip without a FIFO. Only two fall into
- * this category - the original 8250 and the 16450. The
- * 16450 has a scratch register (accessible with LCR=0)
- */
-static void autoconfig_8250(struct uart_8250_port *up)
-{
- unsigned char scratch, status1, status2;
-
- up->port.type = PORT_8250;
-
- scratch = serial_in(up, UART_SCR);
- serial_out(up, UART_SCR, 0xa5);
- status1 = serial_in(up, UART_SCR);
- serial_out(up, UART_SCR, 0x5a);
- status2 = serial_in(up, UART_SCR);
- serial_out(up, UART_SCR, scratch);
-
- if (status1 == 0xa5 && status2 == 0x5a)
- up->port.type = PORT_16450;
-}
-
-static int broken_efr(struct uart_8250_port *up)
-{
- /*
- * Exar ST16C2550 "A2" devices incorrectly detect as
- * having an EFR, and report an ID of 0x0201. See
- * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html
- */
- if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16)
- return 1;
-
- return 0;
-}
-
-/*
- * We know that the chip has FIFOs. Does it have an EFR? The
- * EFR is located in the same register position as the IIR and
- * we know the top two bits of the IIR are currently set. The
- * EFR should contain zero. Try to read the EFR.
- */
-static void autoconfig_16550a(struct uart_8250_port *up)
-{
- unsigned char status1, status2;
- unsigned int iersave;
-
- up->port.type = PORT_16550A;
- up->capabilities |= UART_CAP_FIFO;
-
- /*
- * XR17V35x UARTs have an extra divisor register, DLD
- * that gets enabled with when DLAB is set which will
- * cause the device to incorrectly match and assign
- * port type to PORT_16650. The EFR for this UART is
- * found at offset 0x09. Instead check the Deice ID (DVID)
- * register for a 2, 4 or 8 port UART.
- */
- if (up->port.flags & UPF_EXAR_EFR) {
- status1 = serial_in(up, UART_EXAR_DVID);
- if (status1 == 0x82 || status1 == 0x84 || status1 == 0x88) {
- DEBUG_AUTOCONF("Exar XR17V35x ");
- up->port.type = PORT_XR17V35X;
- up->capabilities |= UART_CAP_AFE | UART_CAP_EFR |
- UART_CAP_SLEEP;
-
- return;
- }
-
- }
-
- /*
- * Check for presence of the EFR when DLAB is set.
- * Only ST16C650V1 UARTs pass this test.
- */
- serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
- if (serial_in(up, UART_EFR) == 0) {
- serial_out(up, UART_EFR, 0xA8);
- if (serial_in(up, UART_EFR) != 0) {
- DEBUG_AUTOCONF("EFRv1 ");
- up->port.type = PORT_16650;
- up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP;
- } else {
- serial_out(up, UART_LCR, 0);
- serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
- UART_FCR7_64BYTE);
- status1 = serial_in(up, UART_IIR) >> 5;
- serial_out(up, UART_FCR, 0);
- serial_out(up, UART_LCR, 0);
-
- if (status1 == 7)
- up->port.type = PORT_16550A_FSL64;
- else
- DEBUG_AUTOCONF("Motorola 8xxx DUART ");
- }
- serial_out(up, UART_EFR, 0);
- return;
- }
-
- /*
- * Maybe it requires 0xbf to be written to the LCR.
- * (other ST16C650V2 UARTs, TI16C752A, etc)
- */
- serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
- if (serial_in(up, UART_EFR) == 0 && !broken_efr(up)) {
- DEBUG_AUTOCONF("EFRv2 ");
- autoconfig_has_efr(up);
- return;
- }
-
- /*
- * Check for a National Semiconductor SuperIO chip.
- * Attempt to switch to bank 2, read the value of the LOOP bit
- * from EXCR1. Switch back to bank 0, change it in MCR. Then
- * switch back to bank 2, read it from EXCR1 again and check
- * it's changed. If so, set baud_base in EXCR2 to 921600. -- dwmw2
- */
- serial_out(up, UART_LCR, 0);
- status1 = serial_in(up, UART_MCR);
- serial_out(up, UART_LCR, 0xE0);
- status2 = serial_in(up, 0x02); /* EXCR1 */
-
- if (!((status2 ^ status1) & UART_MCR_LOOP)) {
- serial_out(up, UART_LCR, 0);
- serial_out(up, UART_MCR, status1 ^ UART_MCR_LOOP);
- serial_out(up, UART_LCR, 0xE0);
- status2 = serial_in(up, 0x02); /* EXCR1 */
- serial_out(up, UART_LCR, 0);
- serial_out(up, UART_MCR, status1);
-
- if ((status2 ^ status1) & UART_MCR_LOOP) {
- unsigned short quot;
-
- serial_out(up, UART_LCR, 0xE0);
-
- quot = serial_dl_read(up);
- quot <<= 3;
-
- if (ns16550a_goto_highspeed(up))
- serial_dl_write(up, quot);
-
- serial_out(up, UART_LCR, 0);
-
- up->port.uartclk = 921600*16;
- up->port.type = PORT_NS16550A;
- up->capabilities |= UART_NATSEMI;
- return;
- }
- }
-
- /*
- * No EFR. Try to detect a TI16750, which only sets bit 5 of
- * the IIR when 64 byte FIFO mode is enabled when DLAB is set.
- * Try setting it with and without DLAB set. Cheap clones
- * set bit 5 without DLAB set.
- */
- serial_out(up, UART_LCR, 0);
- serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
- status1 = serial_in(up, UART_IIR) >> 5;
- serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
- serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
- serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
- status2 = serial_in(up, UART_IIR) >> 5;
- serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
- serial_out(up, UART_LCR, 0);
-
- DEBUG_AUTOCONF("iir1=%d iir2=%d ", status1, status2);
-
- if (status1 == 6 && status2 == 7) {
- up->port.type = PORT_16750;
- up->capabilities |= UART_CAP_AFE | UART_CAP_SLEEP;
- return;
- }
-
- /*
- * Try writing and reading the UART_IER_UUE bit (b6).
- * If it works, this is probably one of the Xscale platform's
- * internal UARTs.
- * We're going to explicitly set the UUE bit to 0 before
- * trying to write and read a 1 just to make sure it's not
- * already a 1 and maybe locked there before we even start start.
- */
- iersave = serial_in(up, UART_IER);
- serial_out(up, UART_IER, iersave & ~UART_IER_UUE);
- if (!(serial_in(up, UART_IER) & UART_IER_UUE)) {
- /*
- * OK it's in a known zero state, try writing and reading
- * without disturbing the current state of the other bits.
- */
- serial_out(up, UART_IER, iersave | UART_IER_UUE);
- if (serial_in(up, UART_IER) & UART_IER_UUE) {
- /*
- * It's an Xscale.
- * We'll leave the UART_IER_UUE bit set to 1 (enabled).
- */
- DEBUG_AUTOCONF("Xscale ");
- up->port.type = PORT_XSCALE;
- up->capabilities |= UART_CAP_UUE | UART_CAP_RTOIE;
- return;
- }
- } else {
- /*
- * If we got here we couldn't force the IER_UUE bit to 0.
- * Log it and continue.
- */
- DEBUG_AUTOCONF("Couldn't force IER_UUE to 0 ");
- }
- serial_out(up, UART_IER, iersave);
-
- /*
- * Exar uarts have EFR in a weird location
- */
- if (up->port.flags & UPF_EXAR_EFR) {
- DEBUG_AUTOCONF("Exar XR17D15x ");
- up->port.type = PORT_XR17D15X;
- up->capabilities |= UART_CAP_AFE | UART_CAP_EFR |
- UART_CAP_SLEEP;
-
- return;
- }
-
- /*
- * We distinguish between 16550A and U6 16550A by counting
- * how many bytes are in the FIFO.
- */
- if (up->port.type == PORT_16550A && size_fifo(up) == 64) {
- up->port.type = PORT_U6_16550A;
- up->capabilities |= UART_CAP_AFE;
- }
-}
-
-/*
- * This routine is called by rs_init() to initialize a specific serial
- * port. It determines what type of UART chip this serial port is
- * using: 8250, 16450, 16550, 16550A. The important question is
- * whether or not this UART is a 16550A or not, since this will
- * determine whether or not we can use its FIFO features or not.
- */
-static void autoconfig(struct uart_8250_port *up)
-{
- unsigned char status1, scratch, scratch2, scratch3;
- unsigned char save_lcr, save_mcr;
- struct uart_port *port = &up->port;
- unsigned long flags;
- unsigned int old_capabilities;
-
- if (!port->iobase && !port->mapbase && !port->membase)
- return;
-
- DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04lx, 0x%p): ",
- serial_index(port), port->iobase, port->membase);
-
- /*
- * We really do need global IRQs disabled here - we're going to
- * be frobbing the chips IRQ enable register to see if it exists.
- */
- spin_lock_irqsave(&port->lock, flags);
-
- up->capabilities = 0;
- up->bugs = 0;
-
- if (!(port->flags & UPF_BUGGY_UART)) {
- /*
- * Do a simple existence test first; if we fail this,
- * there's no point trying anything else.
- *
- * 0x80 is used as a nonsense port to prevent against
- * false positives due to ISA bus float. The
- * assumption is that 0x80 is a non-existent port;
- * which should be safe since include/asm/io.h also
- * makes this assumption.
- *
- * Note: this is safe as long as MCR bit 4 is clear
- * and the device is in "PC" mode.
- */
- scratch = serial_in(up, UART_IER);
- serial_out(up, UART_IER, 0);
-#ifdef __i386__
- outb(0xff, 0x080);
-#endif
- /*
- * Mask out IER[7:4] bits for test as some UARTs (e.g. TL
- * 16C754B) allow only to modify them if an EFR bit is set.
- */
- scratch2 = serial_in(up, UART_IER) & 0x0f;
- serial_out(up, UART_IER, 0x0F);
-#ifdef __i386__
- outb(0, 0x080);
-#endif
- scratch3 = serial_in(up, UART_IER) & 0x0f;
- serial_out(up, UART_IER, scratch);
- if (scratch2 != 0 || scratch3 != 0x0F) {
- /*
- * We failed; there's nothing here
- */
- spin_unlock_irqrestore(&port->lock, flags);
- DEBUG_AUTOCONF("IER test failed (%02x, %02x) ",
- scratch2, scratch3);
- goto out;
- }
- }
-
- save_mcr = serial_in(up, UART_MCR);
- save_lcr = serial_in(up, UART_LCR);
-
- /*
- * Check to see if a UART is really there. Certain broken
- * internal modems based on the Rockwell chipset fail this
- * test, because they apparently don't implement the loopback
- * test mode. So this test is skipped on the COM 1 through
- * COM 4 ports. This *should* be safe, since no board
- * manufacturer would be stupid enough to design a board
- * that conflicts with COM 1-4 --- we hope!
- */
- if (!(port->flags & UPF_SKIP_TEST)) {
- serial_out(up, UART_MCR, UART_MCR_LOOP | 0x0A);
- status1 = serial_in(up, UART_MSR) & 0xF0;
- serial_out(up, UART_MCR, save_mcr);
- if (status1 != 0x90) {
- spin_unlock_irqrestore(&port->lock, flags);
- DEBUG_AUTOCONF("LOOP test failed (%02x) ",
- status1);
- goto out;
- }
- }
-
- /*
- * We're pretty sure there's a port here. Lets find out what
- * type of port it is. The IIR top two bits allows us to find
- * out if it's 8250 or 16450, 16550, 16550A or later. This
- * determines what we test for next.
- *
- * We also initialise the EFR (if any) to zero for later. The
- * EFR occupies the same register location as the FCR and IIR.
- */
- serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
- serial_out(up, UART_EFR, 0);
- serial_out(up, UART_LCR, 0);
-
- serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
- scratch = serial_in(up, UART_IIR) >> 6;
-
- switch (scratch) {
- case 0:
- autoconfig_8250(up);
- break;
- case 1:
- port->type = PORT_UNKNOWN;
- break;
- case 2:
- port->type = PORT_16550;
- break;
- case 3:
- autoconfig_16550a(up);
- break;
- }
-
-#ifdef CONFIG_SERIAL_8250_RSA
- /*
- * Only probe for RSA ports if we got the region.
- */
- if (port->type == PORT_16550A && up->probe & UART_PROBE_RSA &&
- __enable_rsa(up))
- port->type = PORT_RSA;
-#endif
-
- serial_out(up, UART_LCR, save_lcr);
-
- port->fifosize = uart_config[up->port.type].fifo_size;
- old_capabilities = up->capabilities;
- up->capabilities = uart_config[port->type].flags;
- up->tx_loadsz = uart_config[port->type].tx_loadsz;
-
- if (port->type == PORT_UNKNOWN)
- goto out_lock;
-
- /*
- * Reset the UART.
- */
-#ifdef CONFIG_SERIAL_8250_RSA
- if (port->type == PORT_RSA)
- serial_out(up, UART_RSA_FRR, 0);
-#endif
- serial_out(up, UART_MCR, save_mcr);
- serial8250_clear_fifos(up);
- serial_in(up, UART_RX);
- if (up->capabilities & UART_CAP_UUE)
- serial_out(up, UART_IER, UART_IER_UUE);
- else
- serial_out(up, UART_IER, 0);
-
-out_lock:
- spin_unlock_irqrestore(&port->lock, flags);
- if (up->capabilities != old_capabilities) {
- printk(KERN_WARNING
- "ttyS%d: detected caps %08x should be %08x\n",
- serial_index(port), old_capabilities,
- up->capabilities);
- }
-out:
- DEBUG_AUTOCONF("iir=%d ", scratch);
- DEBUG_AUTOCONF("type=%s\n", uart_config[port->type].name);
-}
-
-static void autoconfig_irq(struct uart_8250_port *up)
-{
- struct uart_port *port = &up->port;
- unsigned char save_mcr, save_ier;
- unsigned char save_ICP = 0;
- unsigned int ICP = 0;
- unsigned long irqs;
- int irq;
-
- if (port->flags & UPF_FOURPORT) {
- ICP = (port->iobase & 0xfe0) | 0x1f;
- save_ICP = inb_p(ICP);
- outb_p(0x80, ICP);
- inb_p(ICP);
- }
-
- /* forget possible initially masked and pending IRQ */
- probe_irq_off(probe_irq_on());
- save_mcr = serial_in(up, UART_MCR);
- save_ier = serial_in(up, UART_IER);
- serial_out(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2);
-
- irqs = probe_irq_on();
- serial_out(up, UART_MCR, 0);
- udelay(10);
- if (port->flags & UPF_FOURPORT) {
- serial_out(up, UART_MCR,
- UART_MCR_DTR | UART_MCR_RTS);
- } else {
- serial_out(up, UART_MCR,
- UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2);
- }
- serial_out(up, UART_IER, 0x0f); /* enable all intrs */
- serial_in(up, UART_LSR);
- serial_in(up, UART_RX);
- serial_in(up, UART_IIR);
- serial_in(up, UART_MSR);
- serial_out(up, UART_TX, 0xFF);
- udelay(20);
- irq = probe_irq_off(irqs);
-
- serial_out(up, UART_MCR, save_mcr);
- serial_out(up, UART_IER, save_ier);
-
- if (port->flags & UPF_FOURPORT)
- outb_p(save_ICP, ICP);
-
- port->irq = (irq > 0) ? irq : 0;
-}
-
-static inline void __stop_tx(struct uart_8250_port *p)
-{
- if (p->ier & UART_IER_THRI) {
- p->ier &= ~UART_IER_THRI;
- serial_out(p, UART_IER, p->ier);
- serial8250_rpm_put_tx(p);
- }
-}
-
-static void serial8250_stop_tx(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
-
- serial8250_rpm_get(up);
- __stop_tx(up);
-
- /*
- * We really want to stop the transmitter from sending.
- */
- if (port->type == PORT_16C950) {
- up->acr |= UART_ACR_TXDIS;
- serial_icr_write(up, UART_ACR, up->acr);
- }
- serial8250_rpm_put(up);
-}
-
-static void serial8250_start_tx(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
-
- serial8250_rpm_get_tx(up);
-
- if (up->dma && !up->dma->tx_dma(up))
- return;
-
- if (!(up->ier & UART_IER_THRI)) {
- up->ier |= UART_IER_THRI;
- serial_port_out(port, UART_IER, up->ier);
-
- if (up->bugs & UART_BUG_TXEN) {
- unsigned char lsr;
- lsr = serial_in(up, UART_LSR);
- up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
- if (lsr & UART_LSR_THRE)
- serial8250_tx_chars(up);
- }
- }
-
- /*
- * Re-enable the transmitter if we disabled it.
- */
- if (port->type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
- up->acr &= ~UART_ACR_TXDIS;
- serial_icr_write(up, UART_ACR, up->acr);
- }
-}
-
-static void serial8250_throttle(struct uart_port *port)
-{
- port->throttle(port);
-}
-
-static void serial8250_unthrottle(struct uart_port *port)
-{
- port->unthrottle(port);
-}
-
-static void serial8250_stop_rx(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
-
- serial8250_rpm_get(up);
-
- up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
- up->port.read_status_mask &= ~UART_LSR_DR;
- serial_port_out(port, UART_IER, up->ier);
-
- serial8250_rpm_put(up);
-}
-
-static void serial8250_disable_ms(struct uart_port *port)
-{
- struct uart_8250_port *up =
- container_of(port, struct uart_8250_port, port);
-
- /* no MSR capabilities */
- if (up->bugs & UART_BUG_NOMSR)
- return;
-
- up->ier &= ~UART_IER_MSI;
- serial_port_out(port, UART_IER, up->ier);
-}
-
-static void serial8250_enable_ms(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
-
- /* no MSR capabilities */
- if (up->bugs & UART_BUG_NOMSR)
- return;
-
- up->ier |= UART_IER_MSI;
-
- serial8250_rpm_get(up);
- serial_port_out(port, UART_IER, up->ier);
- serial8250_rpm_put(up);
-}
-
-/*
- * serial8250_rx_chars: processes according to the passed in LSR
- * value, and returns the remaining LSR bits not handled
- * by this Rx routine.
- */
-unsigned char
-serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr)
-{
- struct uart_port *port = &up->port;
- unsigned char ch;
- int max_count = 256;
- char flag;
-
- do {
- if (likely(lsr & UART_LSR_DR))
- ch = serial_in(up, UART_RX);
- else
- /*
- * Intel 82571 has a Serial Over Lan device that will
- * set UART_LSR_BI without setting UART_LSR_DR when
- * it receives a break. To avoid reading from the
- * receive buffer without UART_LSR_DR bit set, we
- * just force the read character to be 0
- */
- ch = 0;
-
- flag = TTY_NORMAL;
- port->icount.rx++;
-
- lsr |= up->lsr_saved_flags;
- up->lsr_saved_flags = 0;
-
- if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) {
- if (lsr & UART_LSR_BI) {
- lsr &= ~(UART_LSR_FE | UART_LSR_PE);
- port->icount.brk++;
- /*
- * We do the SysRQ and SAK checking
- * here because otherwise the break
- * may get masked by ignore_status_mask
- * or read_status_mask.
- */
- if (uart_handle_break(port))
- goto ignore_char;
- } else if (lsr & UART_LSR_PE)
- port->icount.parity++;
- else if (lsr & UART_LSR_FE)
- port->icount.frame++;
- if (lsr & UART_LSR_OE)
- port->icount.overrun++;
-
- /*
- * Mask off conditions which should be ignored.
- */
- lsr &= port->read_status_mask;
-
- if (lsr & UART_LSR_BI) {
- DEBUG_INTR("handling break....");
- flag = TTY_BREAK;
- } else if (lsr & UART_LSR_PE)
- flag = TTY_PARITY;
- else if (lsr & UART_LSR_FE)
- flag = TTY_FRAME;
- }
- if (uart_handle_sysrq_char(port, ch))
- goto ignore_char;
-
- uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
-
-ignore_char:
- lsr = serial_in(up, UART_LSR);
- } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (--max_count > 0));
- spin_unlock(&port->lock);
- tty_flip_buffer_push(&port->state->port);
- spin_lock(&port->lock);
- return lsr;
-}
-EXPORT_SYMBOL_GPL(serial8250_rx_chars);
-
-void serial8250_tx_chars(struct uart_8250_port *up)
-{
- struct uart_port *port = &up->port;
- struct circ_buf *xmit = &port->state->xmit;
- int count;
-
- if (port->x_char) {
- serial_out(up, UART_TX, port->x_char);
- port->icount.tx++;
- port->x_char = 0;
- return;
- }
- if (uart_tx_stopped(port)) {
- serial8250_stop_tx(port);
- return;
- }
- if (uart_circ_empty(xmit)) {
- __stop_tx(up);
- return;
- }
-
- count = up->tx_loadsz;
- do {
- serial_out(up, UART_TX, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- if (up->capabilities & UART_CAP_HFIFO) {
- if ((serial_port_in(port, UART_LSR) & BOTH_EMPTY) !=
- BOTH_EMPTY)
- break;
- }
- } while (--count > 0);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-
- DEBUG_INTR("THRE...");
-
- /*
- * With RPM enabled, we have to wait until the FIFO is empty before the
- * HW can go idle. So we get here once again with empty FIFO and disable
- * the interrupt and RPM in __stop_tx()
- */
- if (uart_circ_empty(xmit) && !(up->capabilities & UART_CAP_RPM))
- __stop_tx(up);
-}
-EXPORT_SYMBOL_GPL(serial8250_tx_chars);
-
-/* Caller holds uart port lock */
-unsigned int serial8250_modem_status(struct uart_8250_port *up)
-{
- struct uart_port *port = &up->port;
- unsigned int status = serial_in(up, UART_MSR);
-
- status |= up->msr_saved_flags;
- up->msr_saved_flags = 0;
- if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
- port->state != NULL) {
- if (status & UART_MSR_TERI)
- port->icount.rng++;
- if (status & UART_MSR_DDSR)
- port->icount.dsr++;
- if (status & UART_MSR_DDCD)
- uart_handle_dcd_change(port, status & UART_MSR_DCD);
- if (status & UART_MSR_DCTS)
- uart_handle_cts_change(port, status & UART_MSR_CTS);
-
- wake_up_interruptible(&port->state->port.delta_msr_wait);
- }
-
- return status;
-}
-EXPORT_SYMBOL_GPL(serial8250_modem_status);
-
-/*
- * This handles the interrupt from one port.
- */
-int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
-{
- unsigned char status;
- unsigned long flags;
- struct uart_8250_port *up = up_to_u8250p(port);
- int dma_err = 0;
-
- if (iir & UART_IIR_NO_INT)
- return 0;
-
- spin_lock_irqsave(&port->lock, flags);
-
- status = serial_port_in(port, UART_LSR);
-
- DEBUG_INTR("status = %x...", status);
-
- if (status & (UART_LSR_DR | UART_LSR_BI)) {
- if (up->dma)
- dma_err = up->dma->rx_dma(up, iir);
-
- if (!up->dma || dma_err)
- status = serial8250_rx_chars(up, status);
- }
- serial8250_modem_status(up);
- if ((!up->dma || (up->dma && up->dma->tx_err)) &&
- (status & UART_LSR_THRE))
- serial8250_tx_chars(up);
-
- spin_unlock_irqrestore(&port->lock, flags);
- return 1;
-}
-EXPORT_SYMBOL_GPL(serial8250_handle_irq);
-
-static int serial8250_default_handle_irq(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
- unsigned int iir;
- int ret;
-
- serial8250_rpm_get(up);
-
- iir = serial_port_in(port, UART_IIR);
- ret = serial8250_handle_irq(port, iir);
-
- serial8250_rpm_put(up);
- return ret;
-}
-
-/*
- * These Exar UARTs have an extra interrupt indicator that could
- * fire for a few unimplemented interrupts. One of which is a
- * wakeup event when coming out of sleep. Put this here just
- * to be on the safe side that these interrupts don't go unhandled.
- */
-static int exar_handle_irq(struct uart_port *port)
-{
- unsigned char int0, int1, int2, int3;
- unsigned int iir = serial_port_in(port, UART_IIR);
- int ret;
-
- ret = serial8250_handle_irq(port, iir);
-
- if ((port->type == PORT_XR17V35X) ||
- (port->type == PORT_XR17D15X)) {
- int0 = serial_port_in(port, 0x80);
- int1 = serial_port_in(port, 0x81);
- int2 = serial_port_in(port, 0x82);
- int3 = serial_port_in(port, 0x83);
- }
-
- return ret;
-}
-
-/*
- * This is the serial driver's interrupt routine.
- *
- * Arjan thinks the old way was overly complex, so it got simplified.
- * Alan disagrees, saying that need the complexity to handle the weird
- * nature of ISA shared interrupts. (This is a special exception.)
- *
- * In order to handle ISA shared interrupts properly, we need to check
- * that all ports have been serviced, and therefore the ISA interrupt
- * line has been de-asserted.
- *
- * This means we need to loop through all ports. checking that they
- * don't have an interrupt pending.
- */
-static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
-{
- struct irq_info *i = dev_id;
- struct list_head *l, *end = NULL;
- int pass_counter = 0, handled = 0;
-
- DEBUG_INTR("serial8250_interrupt(%d)...", irq);
-
- spin_lock(&i->lock);
-
- l = i->head;
- do {
- struct uart_8250_port *up;
- struct uart_port *port;
-
- up = list_entry(l, struct uart_8250_port, list);
- port = &up->port;
-
- if (port->handle_irq(port)) {
- handled = 1;
- end = NULL;
- } else if (end == NULL)
- end = l;
-
- l = l->next;
-
- if (l == i->head && pass_counter++ > PASS_LIMIT) {
- /* If we hit this, we're dead. */
- printk_ratelimited(KERN_ERR
- "serial8250: too much work for irq%d\n", irq);
- break;
- }
- } while (l != end);
-
- spin_unlock(&i->lock);
-
- DEBUG_INTR("end.\n");
-
- return IRQ_RETVAL(handled);
-}
-
-/*
- * To support ISA shared interrupts, we need to have one interrupt
- * handler that ensures that the IRQ line has been deasserted
- * before returning. Failing to do this will result in the IRQ
- * line being stuck active, and, since ISA irqs are edge triggered,
- * no more IRQs will be seen.
- */
-static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up)
-{
- spin_lock_irq(&i->lock);
-
- if (!list_empty(i->head)) {
- if (i->head == &up->list)
- i->head = i->head->next;
- list_del(&up->list);
- } else {
- BUG_ON(i->head != &up->list);
- i->head = NULL;
- }
- spin_unlock_irq(&i->lock);
- /* List empty so throw away the hash node */
- if (i->head == NULL) {
- hlist_del(&i->node);
- kfree(i);
- }
-}
-
-static int serial_link_irq_chain(struct uart_8250_port *up)
-{
- struct hlist_head *h;
- struct hlist_node *n;
- struct irq_info *i;
- int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0;
-
- mutex_lock(&hash_mutex);
-
- h = &irq_lists[up->port.irq % NR_IRQ_HASH];
-
- hlist_for_each(n, h) {
- i = hlist_entry(n, struct irq_info, node);
- if (i->irq == up->port.irq)
- break;
- }
-
- if (n == NULL) {
- i = kzalloc(sizeof(struct irq_info), GFP_KERNEL);
- if (i == NULL) {
- mutex_unlock(&hash_mutex);
- return -ENOMEM;
- }
- spin_lock_init(&i->lock);
- i->irq = up->port.irq;
- hlist_add_head(&i->node, h);
- }
- mutex_unlock(&hash_mutex);
-
- spin_lock_irq(&i->lock);
-
- if (i->head) {
- list_add(&up->list, i->head);
- spin_unlock_irq(&i->lock);
-
- ret = 0;
- } else {
- INIT_LIST_HEAD(&up->list);
- i->head = &up->list;
- spin_unlock_irq(&i->lock);
- irq_flags |= up->port.irqflags;
- ret = request_irq(up->port.irq, serial8250_interrupt,
- irq_flags, "serial", i);
- if (ret < 0)
- serial_do_unlink(i, up);
- }
-
- return ret;
-}
-
-static void serial_unlink_irq_chain(struct uart_8250_port *up)
-{
- /*
- * yes, some broken gcc emit "warning: 'i' may be used uninitialized"
- * but no, we are not going to take a patch that assigns NULL below.
- */
- struct irq_info *i;
- struct hlist_node *n;
- struct hlist_head *h;
-
- mutex_lock(&hash_mutex);
-
- h = &irq_lists[up->port.irq % NR_IRQ_HASH];
-
- hlist_for_each(n, h) {
- i = hlist_entry(n, struct irq_info, node);
- if (i->irq == up->port.irq)
- break;
- }
-
- BUG_ON(n == NULL);
- BUG_ON(i->head == NULL);
-
- if (list_empty(i->head))
- free_irq(up->port.irq, i);
-
- serial_do_unlink(i, up);
- mutex_unlock(&hash_mutex);
-}
-
-/*
- * This function is used to handle ports that do not have an
- * interrupt. This doesn't work very well for 16450's, but gives
- * barely passable results for a 16550A. (Although at the expense
- * of much CPU overhead).
- */
-static void serial8250_timeout(unsigned long data)
-{
- struct uart_8250_port *up = (struct uart_8250_port *)data;
-
- up->port.handle_irq(&up->port);
- mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port));
-}
-
-static void serial8250_backup_timeout(unsigned long data)
-{
- struct uart_8250_port *up = (struct uart_8250_port *)data;
- unsigned int iir, ier = 0, lsr;
- unsigned long flags;
-
- spin_lock_irqsave(&up->port.lock, flags);
-
- /*
- * Must disable interrupts or else we risk racing with the interrupt
- * based handler.
- */
- if (up->port.irq) {
- ier = serial_in(up, UART_IER);
- serial_out(up, UART_IER, 0);
- }
-
- iir = serial_in(up, UART_IIR);
-
- /*
- * This should be a safe test for anyone who doesn't trust the
- * IIR bits on their UART, but it's specifically designed for
- * the "Diva" UART used on the management processor on many HP
- * ia64 and parisc boxes.
- */
- lsr = serial_in(up, UART_LSR);
- up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
- if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
- (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) &&
- (lsr & UART_LSR_THRE)) {
- iir &= ~(UART_IIR_ID | UART_IIR_NO_INT);
- iir |= UART_IIR_THRI;
- }
-
- if (!(iir & UART_IIR_NO_INT))
- serial8250_tx_chars(up);
-
- if (up->port.irq)
- serial_out(up, UART_IER, ier);
-
- spin_unlock_irqrestore(&up->port.lock, flags);
-
- /* Standard timer interval plus 0.2s to keep the port running */
- mod_timer(&up->timer,
- jiffies + uart_poll_timeout(&up->port) + HZ / 5);
-}
-
-static int univ8250_setup_irq(struct uart_8250_port *up)
-{
- struct uart_port *port = &up->port;
- int retval = 0;
-
- /*
- * The above check will only give an accurate result the first time
- * the port is opened so this value needs to be preserved.
- */
- if (up->bugs & UART_BUG_THRE) {
- pr_debug("ttyS%d - using backup timer\n", serial_index(port));
-
- up->timer.function = serial8250_backup_timeout;
- up->timer.data = (unsigned long)up;
- mod_timer(&up->timer, jiffies +
- uart_poll_timeout(port) + HZ / 5);
- }
-
- /*
- * If the "interrupt" for this port doesn't correspond with any
- * hardware interrupt, we use a timer-based system. The original
- * driver used to do this with IRQ0.
- */
- if (!port->irq) {
- up->timer.data = (unsigned long)up;
- mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
- } else
- retval = serial_link_irq_chain(up);
-
- return retval;
-}
-
-static void univ8250_release_irq(struct uart_8250_port *up)
-{
- struct uart_port *port = &up->port;
-
- del_timer_sync(&up->timer);
- up->timer.function = serial8250_timeout;
- if (port->irq)
- serial_unlink_irq_chain(up);
-}
-
-static unsigned int serial8250_tx_empty(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
- unsigned long flags;
- unsigned int lsr;
-
- serial8250_rpm_get(up);
-
- spin_lock_irqsave(&port->lock, flags);
- lsr = serial_port_in(port, UART_LSR);
- up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
- spin_unlock_irqrestore(&port->lock, flags);
-
- serial8250_rpm_put(up);
-
- return (lsr & BOTH_EMPTY) == BOTH_EMPTY ? TIOCSER_TEMT : 0;
-}
-
-static unsigned int serial8250_get_mctrl(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
- unsigned int status;
- unsigned int ret;
-
- serial8250_rpm_get(up);
- status = serial8250_modem_status(up);
- serial8250_rpm_put(up);
-
- ret = 0;
- if (status & UART_MSR_DCD)
- ret |= TIOCM_CAR;
- if (status & UART_MSR_RI)
- ret |= TIOCM_RNG;
- if (status & UART_MSR_DSR)
- ret |= TIOCM_DSR;
- if (status & UART_MSR_CTS)
- ret |= TIOCM_CTS;
- return ret;
-}
-
-void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
- unsigned char mcr = 0;
-
- if (mctrl & TIOCM_RTS)
- mcr |= UART_MCR_RTS;
- if (mctrl & TIOCM_DTR)
- mcr |= UART_MCR_DTR;
- if (mctrl & TIOCM_OUT1)
- mcr |= UART_MCR_OUT1;
- if (mctrl & TIOCM_OUT2)
- mcr |= UART_MCR_OUT2;
- if (mctrl & TIOCM_LOOP)
- mcr |= UART_MCR_LOOP;
-
- mcr = (mcr & up->mcr_mask) | up->mcr_force | up->mcr;
-
- serial_port_out(port, UART_MCR, mcr);
-}
-EXPORT_SYMBOL_GPL(serial8250_do_set_mctrl);
-
-static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
- if (port->set_mctrl)
- port->set_mctrl(port, mctrl);
- else
- serial8250_do_set_mctrl(port, mctrl);
-}
-
-static void serial8250_break_ctl(struct uart_port *port, int break_state)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
- unsigned long flags;
-
- serial8250_rpm_get(up);
- spin_lock_irqsave(&port->lock, flags);
- if (break_state == -1)
- up->lcr |= UART_LCR_SBC;
- else
- up->lcr &= ~UART_LCR_SBC;
- serial_port_out(port, UART_LCR, up->lcr);
- spin_unlock_irqrestore(&port->lock, flags);
- serial8250_rpm_put(up);
-}
-
-/*
- * Wait for transmitter & holding register to empty
- */
-static void wait_for_xmitr(struct uart_8250_port *up, int bits)
-{
- unsigned int status, tmout = 10000;
-
- /* Wait up to 10ms for the character(s) to be sent. */
- for (;;) {
- status = serial_in(up, UART_LSR);
-
- up->lsr_saved_flags |= status & LSR_SAVE_FLAGS;
-
- if ((status & bits) == bits)
- break;
- if (--tmout == 0)
- break;
- udelay(1);
- }
-
- /* Wait up to 1s for flow control if necessary */
- if (up->port.flags & UPF_CONS_FLOW) {
- unsigned int tmout;
- for (tmout = 1000000; tmout; tmout--) {
- unsigned int msr = serial_in(up, UART_MSR);
- up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
- if (msr & UART_MSR_CTS)
- break;
- udelay(1);
- touch_nmi_watchdog();
- }
- }
-}
-
-#ifdef CONFIG_CONSOLE_POLL
-/*
- * Console polling routines for writing and reading from the uart while
- * in an interrupt or debug context.
- */
-
-static int serial8250_get_poll_char(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
- unsigned char lsr;
- int status;
-
- serial8250_rpm_get(up);
-
- lsr = serial_port_in(port, UART_LSR);
-
- if (!(lsr & UART_LSR_DR)) {
- status = NO_POLL_CHAR;
- goto out;
- }
-
- status = serial_port_in(port, UART_RX);
-out:
- serial8250_rpm_put(up);
- return status;
-}
-
-
-static void serial8250_put_poll_char(struct uart_port *port,
- unsigned char c)
-{
- unsigned int ier;
- struct uart_8250_port *up = up_to_u8250p(port);
-
- serial8250_rpm_get(up);
- /*
- * First save the IER then disable the interrupts
- */
- ier = serial_port_in(port, UART_IER);
- if (up->capabilities & UART_CAP_UUE)
- serial_port_out(port, UART_IER, UART_IER_UUE);
- else
- serial_port_out(port, UART_IER, 0);
-
- wait_for_xmitr(up, BOTH_EMPTY);
- /*
- * Send the character out.
- */
- serial_port_out(port, UART_TX, c);
-
- /*
- * Finally, wait for transmitter to become empty
- * and restore the IER
- */
- wait_for_xmitr(up, BOTH_EMPTY);
- serial_port_out(port, UART_IER, ier);
- serial8250_rpm_put(up);
-}
-
-#endif /* CONFIG_CONSOLE_POLL */
-
-int serial8250_do_startup(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
- unsigned long flags;
- unsigned char lsr, iir;
- int retval;
-
- if (port->type == PORT_8250_CIR)
- return -ENODEV;
-
- if (!port->fifosize)
- port->fifosize = uart_config[port->type].fifo_size;
- if (!up->tx_loadsz)
- up->tx_loadsz = uart_config[port->type].tx_loadsz;
- if (!up->capabilities)
- up->capabilities = uart_config[port->type].flags;
- up->mcr = 0;
-
- if (port->iotype != up->cur_iotype)
- set_io_from_upio(port);
-
- serial8250_rpm_get(up);
- if (port->type == PORT_16C950) {
- /* Wake up and initialize UART */
- up->acr = 0;
- serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B);
- serial_port_out(port, UART_EFR, UART_EFR_ECB);
- serial_port_out(port, UART_IER, 0);
- serial_port_out(port, UART_LCR, 0);
- serial_icr_write(up, UART_CSR, 0); /* Reset the UART */
- serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B);
- serial_port_out(port, UART_EFR, UART_EFR_ECB);
- serial_port_out(port, UART_LCR, 0);
- }
-
-#ifdef CONFIG_SERIAL_8250_RSA
- /*
- * If this is an RSA port, see if we can kick it up to the
- * higher speed clock.
- */
- enable_rsa(up);
-#endif
- /*
- * Clear the FIFO buffers and disable them.
- * (they will be reenabled in set_termios())
- */
- serial8250_clear_fifos(up);
-
- /*
- * Clear the interrupt registers.
- */
- serial_port_in(port, UART_LSR);
- serial_port_in(port, UART_RX);
- serial_port_in(port, UART_IIR);
- serial_port_in(port, UART_MSR);
-
- /*
- * At this point, there's no way the LSR could still be 0xff;
- * if it is, then bail out, because there's likely no UART
- * here.
- */
- if (!(port->flags & UPF_BUGGY_UART) &&
- (serial_port_in(port, UART_LSR) == 0xff)) {
- printk_ratelimited(KERN_INFO "ttyS%d: LSR safety check engaged!\n",
- serial_index(port));
- retval = -ENODEV;
- goto out;
- }
-
- /*
- * For a XR16C850, we need to set the trigger levels
- */
- if (port->type == PORT_16850) {
- unsigned char fctr;
-
- serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
-
- fctr = serial_in(up, UART_FCTR) & ~(UART_FCTR_RX|UART_FCTR_TX);
- serial_port_out(port, UART_FCTR,
- fctr | UART_FCTR_TRGD | UART_FCTR_RX);
- serial_port_out(port, UART_TRG, UART_TRG_96);
- serial_port_out(port, UART_FCTR,
- fctr | UART_FCTR_TRGD | UART_FCTR_TX);
- serial_port_out(port, UART_TRG, UART_TRG_96);
-
- serial_port_out(port, UART_LCR, 0);
- }
-
- if (port->irq) {
- unsigned char iir1;
- /*
- * Test for UARTs that do not reassert THRE when the
- * transmitter is idle and the interrupt has already
- * been cleared. Real 16550s should always reassert
- * this interrupt whenever the transmitter is idle and
- * the interrupt is enabled. Delays are necessary to
- * allow register changes to become visible.
- */
- spin_lock_irqsave(&port->lock, flags);
- if (up->port.irqflags & IRQF_SHARED)
- disable_irq_nosync(port->irq);
-
- wait_for_xmitr(up, UART_LSR_THRE);
- serial_port_out_sync(port, UART_IER, UART_IER_THRI);
- udelay(1); /* allow THRE to set */
- iir1 = serial_port_in(port, UART_IIR);
- serial_port_out(port, UART_IER, 0);
- serial_port_out_sync(port, UART_IER, UART_IER_THRI);
- udelay(1); /* allow a working UART time to re-assert THRE */
- iir = serial_port_in(port, UART_IIR);
- serial_port_out(port, UART_IER, 0);
-
- if (port->irqflags & IRQF_SHARED)
- enable_irq(port->irq);
- spin_unlock_irqrestore(&port->lock, flags);
-
- /*
- * If the interrupt is not reasserted, or we otherwise
- * don't trust the iir, setup a timer to kick the UART
- * on a regular basis.
- */
- if ((!(iir1 & UART_IIR_NO_INT) && (iir & UART_IIR_NO_INT)) ||
- up->port.flags & UPF_BUG_THRE) {
- up->bugs |= UART_BUG_THRE;
- }
- }
-
- retval = up->ops->setup_irq(up);
- if (retval)
- goto out;
-
- /*
- * Now, initialize the UART
- */
- serial_port_out(port, UART_LCR, UART_LCR_WLEN8);
-
- spin_lock_irqsave(&port->lock, flags);
- if (up->port.flags & UPF_FOURPORT) {
- if (!up->port.irq)
- up->port.mctrl |= TIOCM_OUT1;
- } else
- /*
- * Most PC uarts need OUT2 raised to enable interrupts.
- */
- if (port->irq)
- up->port.mctrl |= TIOCM_OUT2;
-
- serial8250_set_mctrl(port, port->mctrl);
-
- /* Serial over Lan (SoL) hack:
- Intel 8257x Gigabit ethernet chips have a
- 16550 emulation, to be used for Serial Over Lan.
- Those chips take a longer time than a normal
- serial device to signalize that a transmission
- data was queued. Due to that, the above test generally
- fails. One solution would be to delay the reading of
- iir. However, this is not reliable, since the timeout
- is variable. So, let's just don't test if we receive
- TX irq. This way, we'll never enable UART_BUG_TXEN.
- */
- if (up->port.flags & UPF_NO_TXEN_TEST)
- goto dont_test_tx_en;
-
- /*
- * Do a quick test to see if we receive an
- * interrupt when we enable the TX irq.
- */
- serial_port_out(port, UART_IER, UART_IER_THRI);
- lsr = serial_port_in(port, UART_LSR);
- iir = serial_port_in(port, UART_IIR);
- serial_port_out(port, UART_IER, 0);
-
- if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT) {
- if (!(up->bugs & UART_BUG_TXEN)) {
- up->bugs |= UART_BUG_TXEN;
- pr_debug("ttyS%d - enabling bad tx status workarounds\n",
- serial_index(port));
- }
- } else {
- up->bugs &= ~UART_BUG_TXEN;
- }
-
-dont_test_tx_en:
- spin_unlock_irqrestore(&port->lock, flags);
-
- /*
- * Clear the interrupt registers again for luck, and clear the
- * saved flags to avoid getting false values from polling
- * routines or the previous session.
- */
- serial_port_in(port, UART_LSR);
- serial_port_in(port, UART_RX);
- serial_port_in(port, UART_IIR);
- serial_port_in(port, UART_MSR);
- up->lsr_saved_flags = 0;
- up->msr_saved_flags = 0;
-
- /*
- * Request DMA channels for both RX and TX.
- */
- if (up->dma) {
- retval = serial8250_request_dma(up);
- if (retval) {
- pr_warn_ratelimited("ttyS%d - failed to request DMA\n",
- serial_index(port));
- up->dma = NULL;
- }
- }
-
- /*
- * Finally, enable interrupts. Note: Modem status interrupts
- * are set via set_termios(), which will be occurring imminently
- * anyway, so we don't enable them here.
- */
- up->ier = UART_IER_RLSI | UART_IER_RDI;
- serial_port_out(port, UART_IER, up->ier);
-
- if (port->flags & UPF_FOURPORT) {
- unsigned int icp;
- /*
- * Enable interrupts on the AST Fourport board
- */
- icp = (port->iobase & 0xfe0) | 0x01f;
- outb_p(0x80, icp);
- inb_p(icp);
- }
- retval = 0;
-out:
- serial8250_rpm_put(up);
- return retval;
-}
-EXPORT_SYMBOL_GPL(serial8250_do_startup);
-
-static int serial8250_startup(struct uart_port *port)
-{
- if (port->startup)
- return port->startup(port);
- return serial8250_do_startup(port);
-}
-
-void serial8250_do_shutdown(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
- unsigned long flags;
-
- serial8250_rpm_get(up);
- /*
- * Disable interrupts from this port
- */
- up->ier = 0;
- serial_port_out(port, UART_IER, 0);
-
- if (up->dma)
- serial8250_release_dma(up);
-
- spin_lock_irqsave(&port->lock, flags);
- if (port->flags & UPF_FOURPORT) {
- /* reset interrupts on the AST Fourport board */
- inb((port->iobase & 0xfe0) | 0x1f);
- port->mctrl |= TIOCM_OUT1;
- } else
- port->mctrl &= ~TIOCM_OUT2;
-
- serial8250_set_mctrl(port, port->mctrl);
- spin_unlock_irqrestore(&port->lock, flags);
-
- /*
- * Disable break condition and FIFOs
- */
- serial_port_out(port, UART_LCR,
- serial_port_in(port, UART_LCR) & ~UART_LCR_SBC);
- serial8250_clear_fifos(up);
-
-#ifdef CONFIG_SERIAL_8250_RSA
- /*
- * Reset the RSA board back to 115kbps compat mode.
- */
- disable_rsa(up);
-#endif
-
- /*
- * Read data port to reset things, and then unlink from
- * the IRQ chain.
- */
- serial_port_in(port, UART_RX);
- serial8250_rpm_put(up);
-
- up->ops->release_irq(up);
-}
-EXPORT_SYMBOL_GPL(serial8250_do_shutdown);
-
-static void serial8250_shutdown(struct uart_port *port)
-{
- if (port->shutdown)
- port->shutdown(port);
- else
- serial8250_do_shutdown(port);
-}
-
-/*
- * XR17V35x UARTs have an extra fractional divisor register (DLD)
- * Calculate divisor with extra 4-bit fractional portion
- */
-static unsigned int xr17v35x_get_divisor(struct uart_8250_port *up,
- unsigned int baud,
- unsigned int *frac)
-{
- struct uart_port *port = &up->port;
- unsigned int quot_16;
-
- quot_16 = DIV_ROUND_CLOSEST(port->uartclk, baud);
- *frac = quot_16 & 0x0f;
-
- return quot_16 >> 4;
-}
-
-static unsigned int serial8250_get_divisor(struct uart_8250_port *up,
- unsigned int baud,
- unsigned int *frac)
-{
- struct uart_port *port = &up->port;
- unsigned int quot;
-
- /*
- * Handle magic divisors for baud rates above baud_base on
- * SMSC SuperIO chips.
- *
- */
- if ((port->flags & UPF_MAGIC_MULTIPLIER) &&
- baud == (port->uartclk/4))
- quot = 0x8001;
- else if ((port->flags & UPF_MAGIC_MULTIPLIER) &&
- baud == (port->uartclk/8))
- quot = 0x8002;
- else if (up->port.type == PORT_XR17V35X)
- quot = xr17v35x_get_divisor(up, baud, frac);
- else
- quot = uart_get_divisor(port, baud);
-
- /*
- * Oxford Semi 952 rev B workaround
- */
- if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0)
- quot++;
-
- return quot;
-}
-
-static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
- tcflag_t c_cflag)
-{
- unsigned char cval;
-
- switch (c_cflag & CSIZE) {
- case CS5:
- cval = UART_LCR_WLEN5;
- break;
- case CS6:
- cval = UART_LCR_WLEN6;
- break;
- case CS7:
- cval = UART_LCR_WLEN7;
- break;
- default:
- case CS8:
- cval = UART_LCR_WLEN8;
- break;
- }
-
- if (c_cflag & CSTOPB)
- cval |= UART_LCR_STOP;
- if (c_cflag & PARENB) {
- cval |= UART_LCR_PARITY;
- if (up->bugs & UART_BUG_PARITY)
- up->fifo_bug = true;
- }
- if (!(c_cflag & PARODD))
- cval |= UART_LCR_EPAR;
-#ifdef CMSPAR
- if (c_cflag & CMSPAR)
- cval |= UART_LCR_SPAR;
-#endif
-
- return cval;
-}
-
-static void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
- unsigned int quot, unsigned int quot_frac)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
-
- /* Workaround to enable 115200 baud on OMAP1510 internal ports */
- if (is_omap1510_8250(up)) {
- if (baud == 115200) {
- quot = 1;
- serial_port_out(port, UART_OMAP_OSC_12M_SEL, 1);
- } else
- serial_port_out(port, UART_OMAP_OSC_12M_SEL, 0);
- }
-
- /*
- * For NatSemi, switch to bank 2 not bank 1, to avoid resetting EXCR2,
- * otherwise just set DLAB
- */
- if (up->capabilities & UART_NATSEMI)
- serial_port_out(port, UART_LCR, 0xe0);
- else
- serial_port_out(port, UART_LCR, up->lcr | UART_LCR_DLAB);
-
- serial_dl_write(up, quot);
-
- /* XR17V35x UARTs have an extra fractional divisor register (DLD) */
- if (up->port.type == PORT_XR17V35X)
- serial_port_out(port, 0x2, quot_frac);
-}
-
-void
-serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
- struct ktermios *old)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
- unsigned char cval;
- unsigned long flags;
- unsigned int baud, quot, frac = 0;
-
- cval = serial8250_compute_lcr(up, termios->c_cflag);
-
- /*
- * Ask the core to calculate the divisor for us.
- */
- baud = uart_get_baud_rate(port, termios, old,
- port->uartclk / 16 / 0xffff,
- port->uartclk / 16);
- quot = serial8250_get_divisor(up, baud, &frac);
-
- /*
- * Ok, we're now changing the port state. Do it with
- * interrupts disabled.
- */
- serial8250_rpm_get(up);
- spin_lock_irqsave(&port->lock, flags);
-
- up->lcr = cval; /* Save computed LCR */
-
- if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) {
- /* NOTE: If fifo_bug is not set, a user can set RX_trigger. */
- if ((baud < 2400 && !up->dma) || up->fifo_bug) {
- up->fcr &= ~UART_FCR_TRIGGER_MASK;
- up->fcr |= UART_FCR_TRIGGER_1;
- }
- }
-
- /*
- * MCR-based auto flow control. When AFE is enabled, RTS will be
- * deasserted when the receive FIFO contains more characters than
- * the trigger, or the MCR RTS bit is cleared. In the case where
- * the remote UART is not using CTS auto flow control, we must
- * have sufficient FIFO entries for the latency of the remote
- * UART to respond. IOW, at least 32 bytes of FIFO.
- */
- if (up->capabilities & UART_CAP_AFE && port->fifosize >= 32) {
- up->mcr &= ~UART_MCR_AFE;
- if (termios->c_cflag & CRTSCTS)
- up->mcr |= UART_MCR_AFE;
- }
-
- /*
- * Update the per-port timeout.
- */
- uart_update_timeout(port, termios->c_cflag, baud);
-
- port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
- if (termios->c_iflag & INPCK)
- port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
- if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
- port->read_status_mask |= UART_LSR_BI;
-
- /*
- * Characteres to ignore
- */
- port->ignore_status_mask = 0;
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
- if (termios->c_iflag & IGNBRK) {
- port->ignore_status_mask |= UART_LSR_BI;
- /*
- * If we're ignoring parity and break indicators,
- * ignore overruns too (for real raw support).
- */
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= UART_LSR_OE;
- }
-
- /*
- * ignore all characters if CREAD is not set
- */
- if ((termios->c_cflag & CREAD) == 0)
- port->ignore_status_mask |= UART_LSR_DR;
-
- /*
- * CTS flow control flag and modem status interrupts
- */
- up->ier &= ~UART_IER_MSI;
- if (!(up->bugs & UART_BUG_NOMSR) &&
- UART_ENABLE_MS(&up->port, termios->c_cflag))
- up->ier |= UART_IER_MSI;
- if (up->capabilities & UART_CAP_UUE)
- up->ier |= UART_IER_UUE;
- if (up->capabilities & UART_CAP_RTOIE)
- up->ier |= UART_IER_RTOIE;
-
- serial_port_out(port, UART_IER, up->ier);
-
- if (up->capabilities & UART_CAP_EFR) {
- unsigned char efr = 0;
- /*
- * TI16C752/Startech hardware flow control. FIXME:
- * - TI16C752 requires control thresholds to be set.
- * - UART_MCR_RTS is ineffective if auto-RTS mode is enabled.
- */
- if (termios->c_cflag & CRTSCTS)
- efr |= UART_EFR_CTS;
-
- serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B);
- if (port->flags & UPF_EXAR_EFR)
- serial_port_out(port, UART_XR_EFR, efr);
- else
- serial_port_out(port, UART_EFR, efr);
- }
-
- serial8250_set_divisor(port, baud, quot, frac);
+ spin_lock_irqsave(&up->port.lock, flags);
/*
- * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR
- * is written without DLAB set, this mode will be disabled.
+ * Must disable interrupts or else we risk racing with the interrupt
+ * based handler.
*/
- if (port->type == PORT_16750)
- serial_port_out(port, UART_FCR, up->fcr);
-
- serial_port_out(port, UART_LCR, up->lcr); /* reset DLAB */
- if (port->type != PORT_16750) {
- /* emulated UARTs (Lucent Venus 167x) need two steps */
- if (up->fcr & UART_FCR_ENABLE_FIFO)
- serial_port_out(port, UART_FCR, UART_FCR_ENABLE_FIFO);
- serial_port_out(port, UART_FCR, up->fcr); /* set fcr */
- }
- serial8250_set_mctrl(port, port->mctrl);
- spin_unlock_irqrestore(&port->lock, flags);
- serial8250_rpm_put(up);
-
- /* Don't rewrite B0 */
- if (tty_termios_baud_rate(termios))
- tty_termios_encode_baud_rate(termios, baud, baud);
-}
-EXPORT_SYMBOL(serial8250_do_set_termios);
-
-static void
-serial8250_set_termios(struct uart_port *port, struct ktermios *termios,
- struct ktermios *old)
-{
- if (port->set_termios)
- port->set_termios(port, termios, old);
- else
- serial8250_do_set_termios(port, termios, old);
-}
-
-static void
-serial8250_set_ldisc(struct uart_port *port, struct ktermios *termios)
-{
- if (termios->c_line == N_PPS) {
- port->flags |= UPF_HARDPPS_CD;
- spin_lock_irq(&port->lock);
- serial8250_enable_ms(port);
- spin_unlock_irq(&port->lock);
- } else {
- port->flags &= ~UPF_HARDPPS_CD;
- if (!UART_ENABLE_MS(port, termios->c_cflag)) {
- spin_lock_irq(&port->lock);
- serial8250_disable_ms(port);
- spin_unlock_irq(&port->lock);
- }
+ if (up->port.irq) {
+ ier = serial_in(up, UART_IER);
+ serial_out(up, UART_IER, 0);
}
-}
+ iir = serial_in(up, UART_IIR);
-void serial8250_do_pm(struct uart_port *port, unsigned int state,
- unsigned int oldstate)
-{
- struct uart_8250_port *p = up_to_u8250p(port);
+ /*
+ * This should be a safe test for anyone who doesn't trust the
+ * IIR bits on their UART, but it's specifically designed for
+ * the "Diva" UART used on the management processor on many HP
+ * ia64 and parisc boxes.
+ */
+ lsr = serial_in(up, UART_LSR);
+ up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
+ if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
+ (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) &&
+ (lsr & UART_LSR_THRE)) {
+ iir &= ~(UART_IIR_ID | UART_IIR_NO_INT);
+ iir |= UART_IIR_THRI;
+ }
- serial8250_set_sleep(p, state != 0);
-}
-EXPORT_SYMBOL(serial8250_do_pm);
+ if (!(iir & UART_IIR_NO_INT))
+ serial8250_tx_chars(up);
-static void
-serial8250_pm(struct uart_port *port, unsigned int state,
- unsigned int oldstate)
-{
- if (port->pm)
- port->pm(port, state, oldstate);
- else
- serial8250_do_pm(port, state, oldstate);
-}
+ if (up->port.irq)
+ serial_out(up, UART_IER, ier);
-static unsigned int serial8250_port_size(struct uart_8250_port *pt)
-{
- if (pt->port.mapsize)
- return pt->port.mapsize;
- if (pt->port.iotype == UPIO_AU) {
- if (pt->port.type == PORT_RT2880)
- return 0x100;
- return 0x1000;
- }
- if (is_omap1_8250(pt))
- return 0x16 << pt->port.regshift;
+ spin_unlock_irqrestore(&up->port.lock, flags);
- return 8 << pt->port.regshift;
+ /* Standard timer interval plus 0.2s to keep the port running */
+ mod_timer(&up->timer,
+ jiffies + uart_poll_timeout(&up->port) + HZ / 5);
}
-/*
- * Resource handling.
- */
-static int serial8250_request_std_resource(struct uart_8250_port *up)
+static int univ8250_setup_irq(struct uart_8250_port *up)
{
- unsigned int size = serial8250_port_size(up);
struct uart_port *port = &up->port;
- int ret = 0;
+ int retval = 0;
- switch (port->iotype) {
- case UPIO_AU:
- case UPIO_TSI:
- case UPIO_MEM32:
- case UPIO_MEM32BE:
- case UPIO_MEM:
- if (!port->mapbase)
- break;
+ /*
+ * The above check will only give an accurate result the first time
+ * the port is opened so this value needs to be preserved.
+ */
+ if (up->bugs & UART_BUG_THRE) {
+ pr_debug("ttyS%d - using backup timer\n", serial_index(port));
- if (!request_mem_region(port->mapbase, size, "serial")) {
- ret = -EBUSY;
- break;
- }
+ up->timer.function = serial8250_backup_timeout;
+ up->timer.data = (unsigned long)up;
+ mod_timer(&up->timer, jiffies +
+ uart_poll_timeout(port) + HZ / 5);
+ }
- if (port->flags & UPF_IOREMAP) {
- port->membase = ioremap_nocache(port->mapbase, size);
- if (!port->membase) {
- release_mem_region(port->mapbase, size);
- ret = -ENOMEM;
- }
- }
- break;
+ /*
+ * If the "interrupt" for this port doesn't correspond with any
+ * hardware interrupt, we use a timer-based system. The original
+ * driver used to do this with IRQ0.
+ */
+ if (!port->irq) {
+ up->timer.data = (unsigned long)up;
+ mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
+ } else
+ retval = serial_link_irq_chain(up);
- case UPIO_HUB6:
- case UPIO_PORT:
- if (!request_region(port->iobase, size, "serial"))
- ret = -EBUSY;
- break;
- }
- return ret;
+ return retval;
}
-static void serial8250_release_std_resource(struct uart_8250_port *up)
+static void univ8250_release_irq(struct uart_8250_port *up)
{
- unsigned int size = serial8250_port_size(up);
struct uart_port *port = &up->port;
- switch (port->iotype) {
- case UPIO_AU:
- case UPIO_TSI:
- case UPIO_MEM32:
- case UPIO_MEM32BE:
- case UPIO_MEM:
- if (!port->mapbase)
- break;
-
- if (port->flags & UPF_IOREMAP) {
- iounmap(port->membase);
- port->membase = NULL;
- }
-
- release_mem_region(port->mapbase, size);
- break;
-
- case UPIO_HUB6:
- case UPIO_PORT:
- release_region(port->iobase, size);
- break;
- }
+ del_timer_sync(&up->timer);
+ up->timer.function = serial8250_timeout;
+ if (port->irq)
+ serial_unlink_irq_chain(up);
}
#ifdef CONFIG_SERIAL_8250_RSA
}
#endif
-static void serial8250_release_port(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
-
- serial8250_release_std_resource(up);
-}
-
-static int serial8250_request_port(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
- int ret;
-
- if (port->type == PORT_8250_CIR)
- return -ENODEV;
-
- ret = serial8250_request_std_resource(up);
-
- return ret;
-}
-
-static int fcr_get_rxtrig_bytes(struct uart_8250_port *up)
-{
- const struct serial8250_config *conf_type = &uart_config[up->port.type];
- unsigned char bytes;
-
- bytes = conf_type->rxtrig_bytes[UART_FCR_R_TRIG_BITS(up->fcr)];
-
- return bytes ? bytes : -EOPNOTSUPP;
-}
-
-static int bytes_to_fcr_rxtrig(struct uart_8250_port *up, unsigned char bytes)
-{
- const struct serial8250_config *conf_type = &uart_config[up->port.type];
- int i;
-
- if (!conf_type->rxtrig_bytes[UART_FCR_R_TRIG_BITS(UART_FCR_R_TRIG_00)])
- return -EOPNOTSUPP;
-
- for (i = 1; i < UART_FCR_R_TRIG_MAX_STATE; i++) {
- if (bytes < conf_type->rxtrig_bytes[i])
- /* Use the nearest lower value */
- return (--i) << UART_FCR_R_TRIG_SHIFT;
- }
-
- return UART_FCR_R_TRIG_11;
-}
-
-static int do_get_rxtrig(struct tty_port *port)
-{
- struct uart_state *state = container_of(port, struct uart_state, port);
- struct uart_port *uport = state->uart_port;
- struct uart_8250_port *up =
- container_of(uport, struct uart_8250_port, port);
-
- if (!(up->capabilities & UART_CAP_FIFO) || uport->fifosize <= 1)
- return -EINVAL;
-
- return fcr_get_rxtrig_bytes(up);
-}
-
-static int do_serial8250_get_rxtrig(struct tty_port *port)
-{
- int rxtrig_bytes;
-
- mutex_lock(&port->mutex);
- rxtrig_bytes = do_get_rxtrig(port);
- mutex_unlock(&port->mutex);
-
- return rxtrig_bytes;
-}
-
-static ssize_t serial8250_get_attr_rx_trig_bytes(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct tty_port *port = dev_get_drvdata(dev);
- int rxtrig_bytes;
-
- rxtrig_bytes = do_serial8250_get_rxtrig(port);
- if (rxtrig_bytes < 0)
- return rxtrig_bytes;
-
- return snprintf(buf, PAGE_SIZE, "%d\n", rxtrig_bytes);
-}
-
-static int do_set_rxtrig(struct tty_port *port, unsigned char bytes)
-{
- struct uart_state *state = container_of(port, struct uart_state, port);
- struct uart_port *uport = state->uart_port;
- struct uart_8250_port *up =
- container_of(uport, struct uart_8250_port, port);
- int rxtrig;
-
- if (!(up->capabilities & UART_CAP_FIFO) || uport->fifosize <= 1 ||
- up->fifo_bug)
- return -EINVAL;
-
- rxtrig = bytes_to_fcr_rxtrig(up, bytes);
- if (rxtrig < 0)
- return rxtrig;
-
- serial8250_clear_fifos(up);
- up->fcr &= ~UART_FCR_TRIGGER_MASK;
- up->fcr |= (unsigned char)rxtrig;
- serial_out(up, UART_FCR, up->fcr);
- return 0;
-}
-
-static int do_serial8250_set_rxtrig(struct tty_port *port, unsigned char bytes)
-{
- int ret;
-
- mutex_lock(&port->mutex);
- ret = do_set_rxtrig(port, bytes);
- mutex_unlock(&port->mutex);
-
- return ret;
-}
-
-static ssize_t serial8250_set_attr_rx_trig_bytes(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t count)
-{
- struct tty_port *port = dev_get_drvdata(dev);
- unsigned char bytes;
- int ret;
-
- if (!count)
- return -EINVAL;
-
- ret = kstrtou8(buf, 10, &bytes);
- if (ret < 0)
- return ret;
-
- ret = do_serial8250_set_rxtrig(port, bytes);
- if (ret < 0)
- return ret;
-
- return count;
-}
-
-static DEVICE_ATTR(rx_trig_bytes, S_IRUSR | S_IWUSR | S_IRGRP,
- serial8250_get_attr_rx_trig_bytes,
- serial8250_set_attr_rx_trig_bytes);
-
-static struct attribute *serial8250_dev_attrs[] = {
- &dev_attr_rx_trig_bytes.attr,
- NULL,
- };
-
-static struct attribute_group serial8250_dev_attr_group = {
- .attrs = serial8250_dev_attrs,
- };
-
-static void register_dev_spec_attr_grp(struct uart_8250_port *up)
-{
- const struct serial8250_config *conf_type = &uart_config[up->port.type];
-
- if (conf_type->rxtrig_bytes[0])
- up->port.attr_group = &serial8250_dev_attr_group;
-}
-
-static void serial8250_config_port(struct uart_port *port, int flags)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
- int ret;
-
- if (port->type == PORT_8250_CIR)
- return;
-
- /*
- * Find the region that we can probe for. This in turn
- * tells us whether we can probe for the type of port.
- */
- ret = serial8250_request_std_resource(up);
- if (ret < 0)
- return;
-
- if (port->iotype != up->cur_iotype)
- set_io_from_upio(port);
-
- if (flags & UART_CONFIG_TYPE)
- autoconfig(up);
-
- /* if access method is AU, it is a 16550 with a quirk */
- if (port->type == PORT_16550A && port->iotype == UPIO_AU)
- up->bugs |= UART_BUG_NOMSR;
-
- /* HW bugs may trigger IRQ while IIR == NO_INT */
- if (port->type == PORT_TEGRA)
- up->bugs |= UART_BUG_NOMSR;
-
- if (port->type != PORT_UNKNOWN && flags & UART_CONFIG_IRQ)
- autoconfig_irq(up);
-
- if (port->type == PORT_UNKNOWN)
- serial8250_release_std_resource(up);
-
- /* Fixme: probably not the best place for this */
- if ((port->type == PORT_XR17V35X) ||
- (port->type == PORT_XR17D15X))
- port->handle_irq = exar_handle_irq;
-
- register_dev_spec_attr_grp(up);
- up->fcr = uart_config[up->port.type].fcr;
-}
-
-static int
-serial8250_verify_port(struct uart_port *port, struct serial_struct *ser)
-{
- if (ser->irq >= nr_irqs || ser->irq < 0 ||
- ser->baud_base < 9600 || ser->type < PORT_UNKNOWN ||
- ser->type >= ARRAY_SIZE(uart_config) || ser->type == PORT_CIRRUS ||
- ser->type == PORT_STARTECH)
- return -EINVAL;
- return 0;
-}
-
-static const char *
-serial8250_type(struct uart_port *port)
-{
- int type = port->type;
-
- if (type >= ARRAY_SIZE(uart_config))
- type = 0;
- return uart_config[type].name;
-}
-
-static const struct uart_ops serial8250_pops = {
- .tx_empty = serial8250_tx_empty,
- .set_mctrl = serial8250_set_mctrl,
- .get_mctrl = serial8250_get_mctrl,
- .stop_tx = serial8250_stop_tx,
- .start_tx = serial8250_start_tx,
- .throttle = serial8250_throttle,
- .unthrottle = serial8250_unthrottle,
- .stop_rx = serial8250_stop_rx,
- .enable_ms = serial8250_enable_ms,
- .break_ctl = serial8250_break_ctl,
- .startup = serial8250_startup,
- .shutdown = serial8250_shutdown,
- .set_termios = serial8250_set_termios,
- .set_ldisc = serial8250_set_ldisc,
- .pm = serial8250_pm,
- .type = serial8250_type,
- .release_port = serial8250_release_port,
- .request_port = serial8250_request_port,
- .config_port = serial8250_config_port,
- .verify_port = serial8250_verify_port,
-#ifdef CONFIG_CONSOLE_POLL
- .poll_get_char = serial8250_get_poll_char,
- .poll_put_char = serial8250_put_poll_char,
-#endif
-};
-
static const struct uart_ops *base_ops;
static struct uart_ops univ8250_port_ops;
}
EXPORT_SYMBOL(serial8250_set_isa_configurator);
-static void serial8250_init_port(struct uart_8250_port *up)
-{
- struct uart_port *port = &up->port;
-
- spin_lock_init(&port->lock);
- port->ops = &serial8250_pops;
-
- up->cur_iotype = 0xFF;
-}
-
-static void serial8250_set_defaults(struct uart_8250_port *up)
-{
- struct uart_port *port = &up->port;
-
- if (up->port.flags & UPF_FIXED_TYPE) {
- unsigned int type = up->port.type;
-
- if (!up->port.fifosize)
- up->port.fifosize = uart_config[type].fifo_size;
- if (!up->tx_loadsz)
- up->tx_loadsz = uart_config[type].tx_loadsz;
- if (!up->capabilities)
- up->capabilities = uart_config[type].flags;
- }
-
- set_io_from_upio(port);
-
- /* default dma handlers */
- if (up->dma) {
- if (!up->dma->tx_dma)
- up->dma->tx_dma = serial8250_tx_dma;
- if (!up->dma->rx_dma)
- up->dma->rx_dma = serial8250_rx_dma;
- }
-}
-
#ifdef CONFIG_SERIAL_8250_RSA
static void univ8250_config_port(struct uart_port *port, int flags)
#ifdef CONFIG_SERIAL_8250_CONSOLE
-static void serial8250_console_putchar(struct uart_port *port, int ch)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
-
- wait_for_xmitr(up, UART_LSR_THRE);
- serial_port_out(port, UART_TX, ch);
-}
-
-/*
- * Print a string to the serial port trying not to disturb
- * any possible real use of the port...
- *
- * The console_lock must be held when we get here.
- */
-static void serial8250_console_write(struct uart_8250_port *up, const char *s,
- unsigned int count)
-{
- struct uart_port *port = &up->port;
- unsigned long flags;
- unsigned int ier;
- int locked = 1;
-
- touch_nmi_watchdog();
-
- serial8250_rpm_get(up);
-
- if (port->sysrq)
- locked = 0;
- else if (oops_in_progress)
- locked = spin_trylock_irqsave(&port->lock, flags);
- else
- spin_lock_irqsave(&port->lock, flags);
-
- /*
- * First save the IER then disable the interrupts
- */
- ier = serial_port_in(port, UART_IER);
-
- if (up->capabilities & UART_CAP_UUE)
- serial_port_out(port, UART_IER, UART_IER_UUE);
- else
- serial_port_out(port, UART_IER, 0);
-
- /* check scratch reg to see if port powered off during system sleep */
- if (up->canary && (up->canary != serial_port_in(port, UART_SCR))) {
- struct ktermios termios;
- unsigned int baud, quot, frac = 0;
-
- termios.c_cflag = port->cons->cflag;
- if (port->state->port.tty && termios.c_cflag == 0)
- termios.c_cflag = port->state->port.tty->termios.c_cflag;
-
- baud = uart_get_baud_rate(port, &termios, NULL,
- port->uartclk / 16 / 0xffff,
- port->uartclk / 16);
- quot = serial8250_get_divisor(up, baud, &frac);
-
- serial8250_set_divisor(port, baud, quot, frac);
- serial_port_out(port, UART_LCR, up->lcr);
- serial_port_out(port, UART_MCR, UART_MCR_DTR | UART_MCR_RTS);
-
- up->canary = 0;
- }
-
- uart_console_write(port, s, count, serial8250_console_putchar);
-
- /*
- * Finally, wait for transmitter to become empty
- * and restore the IER
- */
- wait_for_xmitr(up, BOTH_EMPTY);
- serial_port_out(port, UART_IER, ier);
-
- /*
- * The receive handling will happen properly because the
- * receive ready bit will still be set; it is not cleared
- * on read. However, modem control will not, we must
- * call it if we have saved something in the saved flags
- * while processing with interrupts off.
- */
- if (up->msr_saved_flags)
- serial8250_modem_status(up);
-
- if (locked)
- spin_unlock_irqrestore(&port->lock, flags);
- serial8250_rpm_put(up);
-}
-
static void univ8250_console_write(struct console *co, const char *s,
unsigned int count)
{
serial8250_console_write(up, s, count);
}
-static unsigned int probe_baud(struct uart_port *port)
-{
- unsigned char lcr, dll, dlm;
- unsigned int quot;
-
- lcr = serial_port_in(port, UART_LCR);
- serial_port_out(port, UART_LCR, lcr | UART_LCR_DLAB);
- dll = serial_port_in(port, UART_DLL);
- dlm = serial_port_in(port, UART_DLM);
- serial_port_out(port, UART_LCR, lcr);
-
- quot = (dlm << 8) | dll;
- return (port->uartclk / 16) / quot;
-}
-
-static int serial8250_console_setup(struct uart_port *port, char *options, bool probe)
-{
- int baud = 9600;
- int bits = 8;
- int parity = 'n';
- int flow = 'n';
-
- if (!port->iobase && !port->membase)
- return -ENODEV;
-
- if (options)
- uart_parse_options(options, &baud, &parity, &bits, &flow);
- else if (probe)
- baud = probe_baud(port);
-
- return uart_set_options(port, port->cons, baud, parity, bits, flow);
-}
-
static int univ8250_console_setup(struct console *co, char *options)
{
struct uart_port *port;
projects / cascardo / linux.git / blobdiff