*/
/*
- * This file implements two early consoles named mrst and hsu.
- * mrst is based on Maxim3110 spi-uart device, it exists in both
- * Moorestown and Medfield platforms, while hsu is based on a High
- * Speed UART device which only exists in the Medfield platform
+ * This file implements early console named hsu.
+ * hsu is based on a High Speed UART device which only exists in the Medfield
+ * platform
*/
#include <linux/serial_reg.h>
#include <linux/serial_mfd.h>
-#include <linux/kmsg_dump.h>
#include <linux/console.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <asm/pgtable.h>
#include <asm/intel-mid.h>
-#define MRST_SPI_TIMEOUT 0x200000
-#define MRST_REGBASE_SPI0 0xff128000
-#define MRST_REGBASE_SPI1 0xff128400
-#define MRST_CLK_SPI0_REG 0xff11d86c
-
-/* Bit fields in CTRLR0 */
-#define SPI_DFS_OFFSET 0
-
-#define SPI_FRF_OFFSET 4
-#define SPI_FRF_SPI 0x0
-#define SPI_FRF_SSP 0x1
-#define SPI_FRF_MICROWIRE 0x2
-#define SPI_FRF_RESV 0x3
-
-#define SPI_MODE_OFFSET 6
-#define SPI_SCPH_OFFSET 6
-#define SPI_SCOL_OFFSET 7
-#define SPI_TMOD_OFFSET 8
-#define SPI_TMOD_TR 0x0 /* xmit & recv */
-#define SPI_TMOD_TO 0x1 /* xmit only */
-#define SPI_TMOD_RO 0x2 /* recv only */
-#define SPI_TMOD_EPROMREAD 0x3 /* eeprom read mode */
-
-#define SPI_SLVOE_OFFSET 10
-#define SPI_SRL_OFFSET 11
-#define SPI_CFS_OFFSET 12
-
-/* Bit fields in SR, 7 bits */
-#define SR_MASK 0x7f /* cover 7 bits */
-#define SR_BUSY (1 << 0)
-#define SR_TF_NOT_FULL (1 << 1)
-#define SR_TF_EMPT (1 << 2)
-#define SR_RF_NOT_EMPT (1 << 3)
-#define SR_RF_FULL (1 << 4)
-#define SR_TX_ERR (1 << 5)
-#define SR_DCOL (1 << 6)
-
-struct dw_spi_reg {
- u32 ctrl0;
- u32 ctrl1;
- u32 ssienr;
- u32 mwcr;
- u32 ser;
- u32 baudr;
- u32 txfltr;
- u32 rxfltr;
- u32 txflr;
- u32 rxflr;
- u32 sr;
- u32 imr;
- u32 isr;
- u32 risr;
- u32 txoicr;
- u32 rxoicr;
- u32 rxuicr;
- u32 msticr;
- u32 icr;
- u32 dmacr;
- u32 dmatdlr;
- u32 dmardlr;
- u32 idr;
- u32 version;
-
- /* Currently operates as 32 bits, though only the low 16 bits matter */
- u32 dr;
-} __packed;
-
-#define dw_readl(dw, name) __raw_readl(&(dw)->name)
-#define dw_writel(dw, name, val) __raw_writel((val), &(dw)->name)
-
-/* Default use SPI0 register for mrst, we will detect Penwell and use SPI1 */
-static unsigned long mrst_spi_paddr = MRST_REGBASE_SPI0;
-
-static u32 *pclk_spi0;
-/* Always contains an accessible address, start with 0 */
-static struct dw_spi_reg *pspi;
-
-static struct kmsg_dumper dw_dumper;
-static int dumper_registered;
-
-static void dw_kmsg_dump(struct kmsg_dumper *dumper,
- enum kmsg_dump_reason reason)
-{
- static char line[1024];
- size_t len;
-
- /* When run to this, we'd better re-init the HW */
- mrst_early_console_init();
-
- while (kmsg_dump_get_line(dumper, true, line, sizeof(line), &len))
- early_mrst_console.write(&early_mrst_console, line, len);
-}
-
-/* Set the ratio rate to 115200, 8n1, IRQ disabled */
-static void max3110_write_config(void)
-{
- u16 config;
-
- config = 0xc001;
- dw_writel(pspi, dr, config);
-}
-
-/* Translate char to a eligible word and send to max3110 */
-static void max3110_write_data(char c)
-{
- u16 data;
-
- data = 0x8000 | c;
- dw_writel(pspi, dr, data);
-}
-
-void mrst_early_console_init(void)
-{
- u32 ctrlr0 = 0;
- u32 spi0_cdiv;
- u32 freq; /* Freqency info only need be searched once */
-
- /* Base clk is 100 MHz, the actual clk = 100M / (clk_divider + 1) */
- pclk_spi0 = (void *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE,
- MRST_CLK_SPI0_REG);
- spi0_cdiv = ((*pclk_spi0) & 0xe00) >> 9;
- freq = 100000000 / (spi0_cdiv + 1);
-
- if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_PENWELL)
- mrst_spi_paddr = MRST_REGBASE_SPI1;
-
- pspi = (void *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE,
- mrst_spi_paddr);
-
- /* Disable SPI controller */
- dw_writel(pspi, ssienr, 0);
-
- /* Set control param, 8 bits, transmit only mode */
- ctrlr0 = dw_readl(pspi, ctrl0);
-
- ctrlr0 &= 0xfcc0;
- ctrlr0 |= 0xf | (SPI_FRF_SPI << SPI_FRF_OFFSET)
- | (SPI_TMOD_TO << SPI_TMOD_OFFSET);
- dw_writel(pspi, ctrl0, ctrlr0);
-
- /*
- * Change the spi0 clk to comply with 115200 bps, use 100000 to
- * calculate the clk dividor to make the clock a little slower
- * than real baud rate.
- */
- dw_writel(pspi, baudr, freq/100000);
-
- /* Disable all INT for early phase */
- dw_writel(pspi, imr, 0x0);
-
- /* Set the cs to spi-uart */
- dw_writel(pspi, ser, 0x2);
-
- /* Enable the HW, the last step for HW init */
- dw_writel(pspi, ssienr, 0x1);
-
- /* Set the default configuration */
- max3110_write_config();
-
- /* Register the kmsg dumper */
- if (!dumper_registered) {
- dw_dumper.dump = dw_kmsg_dump;
- kmsg_dump_register(&dw_dumper);
- dumper_registered = 1;
- }
-}
-
-/* Slave select should be called in the read/write function */
-static void early_mrst_spi_putc(char c)
-{
- unsigned int timeout;
- u32 sr;
-
- timeout = MRST_SPI_TIMEOUT;
- /* Early putc needs to make sure the TX FIFO is not full */
- while (--timeout) {
- sr = dw_readl(pspi, sr);
- if (!(sr & SR_TF_NOT_FULL))
- cpu_relax();
- else
- break;
- }
-
- if (!timeout)
- pr_warn("MRST earlycon: timed out\n");
- else
- max3110_write_data(c);
-}
-
-/* Early SPI only uses polling mode */
-static void early_mrst_spi_write(struct console *con, const char *str,
- unsigned n)
-{
- int i;
-
- for (i = 0; i < n && *str; i++) {
- if (*str == '\n')
- early_mrst_spi_putc('\r');
- early_mrst_spi_putc(*str);
- str++;
- }
-}
-
-struct console early_mrst_console = {
- .name = "earlymrst",
- .write = early_mrst_spi_write,
- .flags = CON_PRINTBUFFER,
- .index = -1,
-};
-
/*
* Following is the early console based on Medfield HSU (High
* Speed UART) device.
port = clamp_val(port, 0, 2);
paddr = HSU_PORT_BASE + port * 0x80;
- phsu = (void *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE, paddr);
+ phsu = (void __iomem *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE, paddr);
/* Disable FIFO */
writeb(0x0, phsu + UART_FCR);
+++ /dev/null
-/*
- * mrst_max3110.c - spi uart protocol driver for Maxim 3110
- *
- * Copyright (c) 2008-2010, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-/*
- * Note:
- * 1. From Max3110 spec, the Rx FIFO has 8 words, while the Tx FIFO only has
- * 1 word. If SPI master controller doesn't support sclk frequency change,
- * then the char need be sent out one by one with some delay
- *
- * 2. Currently only RX available interrupt is used, no need for waiting TXE
- * interrupt for a low speed UART device
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#ifdef CONFIG_MAGIC_SYSRQ
-#define SUPPORT_SYSRQ
-#endif
-
-#include <linux/module.h>
-#include <linux/ioport.h>
-#include <linux/irq.h>
-#include <linux/init.h>
-#include <linux/console.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/serial_core.h>
-#include <linux/serial_reg.h>
-
-#include <linux/kthread.h>
-#include <linux/spi/spi.h>
-#include <linux/pm.h>
-
-#include "mrst_max3110.h"
-
-#define UART_TX_NEEDED 1
-#define CON_TX_NEEDED 2
-#define BIT_IRQ_PENDING 3
-
-struct uart_max3110 {
- struct uart_port port;
- struct spi_device *spi;
- char name[SPI_NAME_SIZE];
-
- wait_queue_head_t wq;
- struct task_struct *main_thread;
- struct task_struct *read_thread;
- struct mutex thread_mutex;
- struct mutex io_mutex;
-
- u32 baud;
- u16 cur_conf;
- u8 clock;
- u8 parity, word_7bits;
- u16 irq;
-
- unsigned long uart_flags;
-
- /* console related */
- struct circ_buf con_xmit;
-};
-
-/* global data structure, may need be removed */
-static struct uart_max3110 *pmax;
-
-static int receive_chars(struct uart_max3110 *max,
- unsigned short *str, int len);
-static int max3110_read_multi(struct uart_max3110 *max);
-static void max3110_con_receive(struct uart_max3110 *max);
-
-static int max3110_write_then_read(struct uart_max3110 *max,
- const void *txbuf, void *rxbuf, unsigned len, int always_fast)
-{
- struct spi_device *spi = max->spi;
- struct spi_message message;
- struct spi_transfer x;
- int ret;
-
- mutex_lock(&max->io_mutex);
- spi_message_init(&message);
- memset(&x, 0, sizeof x);
- x.len = len;
- x.tx_buf = txbuf;
- x.rx_buf = rxbuf;
- spi_message_add_tail(&x, &message);
-
- if (always_fast)
- x.speed_hz = spi->max_speed_hz;
- else if (max->baud)
- x.speed_hz = max->baud;
-
- /* Do the i/o */
- ret = spi_sync(spi, &message);
- mutex_unlock(&max->io_mutex);
- return ret;
-}
-
-/* Write a 16b word to the device */
-static int max3110_out(struct uart_max3110 *max, const u16 out)
-{
- void *buf;
- u16 *obuf, *ibuf;
- int ret;
-
- buf = kzalloc(8, GFP_KERNEL | GFP_DMA);
- if (!buf)
- return -ENOMEM;
-
- obuf = buf;
- ibuf = buf + 4;
- *obuf = out;
- ret = max3110_write_then_read(max, obuf, ibuf, 2, 1);
- if (ret) {
- pr_warn("%s: get err msg %d when sending 0x%x\n",
- __func__, ret, out);
- goto exit;
- }
-
- receive_chars(max, ibuf, 1);
-
-exit:
- kfree(buf);
- return ret;
-}
-
-/*
- * This is usually used to read data from SPIC RX FIFO, which doesn't
- * need any delay like flushing character out.
- *
- * Return how many valide bytes are read back
- */
-static int max3110_read_multi(struct uart_max3110 *max)
-{
- void *buf;
- u16 *obuf, *ibuf;
- int ret, blen;
-
- blen = M3110_RX_FIFO_DEPTH * sizeof(u16);
- buf = kzalloc(blen * 2, GFP_KERNEL | GFP_DMA);
- if (!buf)
- return 0;
-
- /* tx/rx always have the same length */
- obuf = buf;
- ibuf = buf + blen;
-
- if (max3110_write_then_read(max, obuf, ibuf, blen, 1)) {
- kfree(buf);
- return 0;
- }
-
- ret = receive_chars(max, ibuf, M3110_RX_FIFO_DEPTH);
-
- kfree(buf);
- return ret;
-}
-
-static void serial_m3110_con_putchar(struct uart_port *port, int ch)
-{
- struct uart_max3110 *max =
- container_of(port, struct uart_max3110, port);
- struct circ_buf *xmit = &max->con_xmit;
-
- if (uart_circ_chars_free(xmit)) {
- xmit->buf[xmit->head] = (char)ch;
- xmit->head = (xmit->head + 1) & (PAGE_SIZE - 1);
- }
-}
-
-/*
- * 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 serial_m3110_con_write(struct console *co,
- const char *s, unsigned int count)
-{
- if (!pmax)
- return;
-
- uart_console_write(&pmax->port, s, count, serial_m3110_con_putchar);
-
- if (!test_and_set_bit(CON_TX_NEEDED, &pmax->uart_flags))
- wake_up(&pmax->wq);
-}
-
-static int __init
-serial_m3110_con_setup(struct console *co, char *options)
-{
- struct uart_max3110 *max = pmax;
- int baud = 115200;
- int bits = 8;
- int parity = 'n';
- int flow = 'n';
-
- pr_info("setting up console\n");
-
- if (co->index == -1)
- co->index = 0;
-
- if (!max) {
- pr_err("pmax is NULL, return\n");
- return -ENODEV;
- }
-
- if (options)
- uart_parse_options(options, &baud, &parity, &bits, &flow);
-
- return uart_set_options(&max->port, co, baud, parity, bits, flow);
-}
-
-static struct tty_driver *serial_m3110_con_device(struct console *co,
- int *index)
-{
- struct uart_driver *p = co->data;
- *index = co->index;
- return p->tty_driver;
-}
-
-static struct uart_driver serial_m3110_reg;
-static struct console serial_m3110_console = {
- .name = "ttyS",
- .write = serial_m3110_con_write,
- .device = serial_m3110_con_device,
- .setup = serial_m3110_con_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &serial_m3110_reg,
-};
-
-static unsigned int serial_m3110_tx_empty(struct uart_port *port)
-{
- return 1;
-}
-
-static void serial_m3110_stop_tx(struct uart_port *port)
-{
- return;
-}
-
-/* stop_rx will be called in spin_lock env */
-static void serial_m3110_stop_rx(struct uart_port *port)
-{
- return;
-}
-
-#define WORDS_PER_XFER 128
-static void send_circ_buf(struct uart_max3110 *max,
- struct circ_buf *xmit)
-{
- void *buf;
- u16 *obuf, *ibuf;
- int i, len, blen, dma_size, left, ret = 0;
-
-
- dma_size = WORDS_PER_XFER * sizeof(u16) * 2;
- buf = kzalloc(dma_size, GFP_KERNEL | GFP_DMA);
- if (!buf)
- return;
- obuf = buf;
- ibuf = buf + dma_size/2;
-
- while (!uart_circ_empty(xmit)) {
- left = uart_circ_chars_pending(xmit);
- while (left) {
- len = min(left, WORDS_PER_XFER);
- blen = len * sizeof(u16);
- memset(ibuf, 0, blen);
-
- for (i = 0; i < len; i++) {
- obuf[i] = (u8)xmit->buf[xmit->tail] | WD_TAG;
- xmit->tail = (xmit->tail + 1) &
- (UART_XMIT_SIZE - 1);
- }
-
- /* Fail to send msg to console is not very critical */
-
- ret = max3110_write_then_read(max, obuf, ibuf, blen, 0);
- if (ret)
- pr_warn("%s: get err msg %d\n", __func__, ret);
-
- receive_chars(max, ibuf, len);
-
- max->port.icount.tx += len;
- left -= len;
- }
- }
-
- kfree(buf);
-}
-
-static void transmit_char(struct uart_max3110 *max)
-{
- struct uart_port *port = &max->port;
- struct circ_buf *xmit = &port->state->xmit;
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(port))
- return;
-
- send_circ_buf(max, xmit);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-
- if (uart_circ_empty(xmit))
- serial_m3110_stop_tx(port);
-}
-
-/*
- * This will be called by uart_write() and tty_write, can't
- * go to sleep
- */
-static void serial_m3110_start_tx(struct uart_port *port)
-{
- struct uart_max3110 *max =
- container_of(port, struct uart_max3110, port);
-
- if (!test_and_set_bit(UART_TX_NEEDED, &max->uart_flags))
- wake_up(&max->wq);
-}
-
-static int
-receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
-{
- struct uart_port *port = &max->port;
- struct tty_port *tport;
- char buf[M3110_RX_FIFO_DEPTH];
- int r, w, usable;
-
- /* If uart is not opened, just return */
- if (!port->state)
- return 0;
-
- tport = &port->state->port;
-
- for (r = 0, w = 0; r < len; r++) {
- if (str[r] & MAX3110_BREAK &&
- uart_handle_break(port))
- continue;
-
- if (str[r] & MAX3110_READ_DATA_AVAILABLE) {
- if (uart_handle_sysrq_char(port, str[r] & 0xff))
- continue;
-
- buf[w++] = str[r] & 0xff;
- }
- }
-
- if (!w)
- return 0;
-
- for (r = 0; w; r += usable, w -= usable) {
- usable = tty_buffer_request_room(tport, w);
- if (usable) {
- tty_insert_flip_string(tport, buf + r, usable);
- port->icount.rx += usable;
- }
- }
- tty_flip_buffer_push(tport);
-
- return r;
-}
-
-/*
- * This routine will be used in read_thread or RX IRQ handling,
- * it will first do one round buffer read(8 words), if there is some
- * valid RX data, will try to read 5 more rounds till all data
- * is read out.
- *
- * Use stack space as data buffer to save some system load, and chose
- * 504 Btyes as a threadhold to do a bulk push to upper tty layer when
- * receiving bulk data, a much bigger buffer may cause stack overflow
- */
-static void max3110_con_receive(struct uart_max3110 *max)
-{
- int loop = 1, num;
-
- do {
- num = max3110_read_multi(max);
-
- if (num) {
- loop = 5;
- }
- } while (--loop);
-}
-
-static int max3110_main_thread(void *_max)
-{
- struct uart_max3110 *max = _max;
- wait_queue_head_t *wq = &max->wq;
- int ret = 0;
- struct circ_buf *xmit = &max->con_xmit;
-
- pr_info("start main thread\n");
-
- do {
- wait_event_interruptible(*wq,
- max->uart_flags || kthread_should_stop());
-
- mutex_lock(&max->thread_mutex);
-
- if (test_and_clear_bit(BIT_IRQ_PENDING, &max->uart_flags))
- max3110_con_receive(max);
-
- /* first handle console output */
- if (test_and_clear_bit(CON_TX_NEEDED, &max->uart_flags))
- send_circ_buf(max, xmit);
-
- /* handle uart output */
- if (test_and_clear_bit(UART_TX_NEEDED, &max->uart_flags))
- transmit_char(max);
-
- mutex_unlock(&max->thread_mutex);
-
- } while (!kthread_should_stop());
-
- return ret;
-}
-
-static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
-{
- struct uart_max3110 *max = dev_id;
-
- /* max3110's irq is a falling edge, not level triggered,
- * so no need to disable the irq */
-
- if (!test_and_set_bit(BIT_IRQ_PENDING, &max->uart_flags))
- wake_up(&max->wq);
-
- return IRQ_HANDLED;
-}
-
-/* if don't use RX IRQ, then need a thread to polling read */
-static int max3110_read_thread(void *_max)
-{
- struct uart_max3110 *max = _max;
-
- pr_info("start read thread\n");
- do {
- /*
- * If can't acquire the mutex, it means the main thread
- * is running which will also perform the rx job
- */
- if (mutex_trylock(&max->thread_mutex)) {
- max3110_con_receive(max);
- mutex_unlock(&max->thread_mutex);
- }
-
- set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(HZ / 20);
- } while (!kthread_should_stop());
-
- return 0;
-}
-
-static int serial_m3110_startup(struct uart_port *port)
-{
- struct uart_max3110 *max =
- container_of(port, struct uart_max3110, port);
- u16 config = 0;
- int ret = 0;
-
- if (port->line != 0) {
- pr_err("uart port startup failed\n");
- return -1;
- }
-
- /* Disable all IRQ and config it to 115200, 8n1 */
- config = WC_TAG | WC_FIFO_ENABLE
- | WC_1_STOPBITS
- | WC_8BIT_WORD
- | WC_BAUD_DR2;
-
- /* as we use thread to handle tx/rx, need set low latency */
- port->state->port.low_latency = 1;
-
- if (max->irq) {
- /* Enable RX IRQ only */
- config |= WC_RXA_IRQ_ENABLE;
- } else {
- /* If IRQ is disabled, start a read thread for input data */
- max->read_thread =
- kthread_run(max3110_read_thread, max, "max3110_read");
- if (IS_ERR(max->read_thread)) {
- ret = PTR_ERR(max->read_thread);
- max->read_thread = NULL;
- pr_err("Can't create read thread!\n");
- return ret;
- }
- }
-
- ret = max3110_out(max, config);
- if (ret) {
- if (max->read_thread)
- kthread_stop(max->read_thread);
- max->read_thread = NULL;
- return ret;
- }
-
- max->cur_conf = config;
- return 0;
-}
-
-static void serial_m3110_shutdown(struct uart_port *port)
-{
- struct uart_max3110 *max =
- container_of(port, struct uart_max3110, port);
- u16 config;
-
- if (max->read_thread) {
- kthread_stop(max->read_thread);
- max->read_thread = NULL;
- }
-
- /* Disable interrupts from this port */
- config = WC_TAG | WC_SW_SHDI;
- max3110_out(max, config);
-}
-
-static void serial_m3110_release_port(struct uart_port *port)
-{
-}
-
-static int serial_m3110_request_port(struct uart_port *port)
-{
- return 0;
-}
-
-static void serial_m3110_config_port(struct uart_port *port, int flags)
-{
- port->type = PORT_MAX3100;
-}
-
-static int
-serial_m3110_verify_port(struct uart_port *port, struct serial_struct *ser)
-{
- /* we don't want the core code to modify any port params */
- return -EINVAL;
-}
-
-
-static const char *serial_m3110_type(struct uart_port *port)
-{
- struct uart_max3110 *max =
- container_of(port, struct uart_max3110, port);
- return max->name;
-}
-
-static void
-serial_m3110_set_termios(struct uart_port *port, struct ktermios *termios,
- struct ktermios *old)
-{
- struct uart_max3110 *max =
- container_of(port, struct uart_max3110, port);
- unsigned char cval;
- unsigned int baud, parity = 0;
- int clk_div = -1;
- u16 new_conf = max->cur_conf;
-
- switch (termios->c_cflag & CSIZE) {
- case CS7:
- cval = UART_LCR_WLEN7;
- new_conf |= WC_7BIT_WORD;
- break;
- default:
- /* We only support CS7 & CS8 */
- termios->c_cflag &= ~CSIZE;
- termios->c_cflag |= CS8;
- case CS8:
- cval = UART_LCR_WLEN8;
- new_conf |= WC_8BIT_WORD;
- break;
- }
-
- baud = uart_get_baud_rate(port, termios, old, 0, 230400);
-
- /* First calc the div for 1.8MHZ clock case */
- switch (baud) {
- case 300:
- clk_div = WC_BAUD_DR384;
- break;
- case 600:
- clk_div = WC_BAUD_DR192;
- break;
- case 1200:
- clk_div = WC_BAUD_DR96;
- break;
- case 2400:
- clk_div = WC_BAUD_DR48;
- break;
- case 4800:
- clk_div = WC_BAUD_DR24;
- break;
- case 9600:
- clk_div = WC_BAUD_DR12;
- break;
- case 19200:
- clk_div = WC_BAUD_DR6;
- break;
- case 38400:
- clk_div = WC_BAUD_DR3;
- break;
- case 57600:
- clk_div = WC_BAUD_DR2;
- break;
- case 115200:
- clk_div = WC_BAUD_DR1;
- break;
- case 230400:
- if (max->clock & MAX3110_HIGH_CLK)
- break;
- default:
- /* Pick the previous baud rate */
- baud = max->baud;
- clk_div = max->cur_conf & WC_BAUD_DIV_MASK;
- tty_termios_encode_baud_rate(termios, baud, baud);
- }
-
- if (max->clock & MAX3110_HIGH_CLK) {
- clk_div += 1;
- /* High clk version max3110 doesn't support B300 */
- if (baud == 300) {
- baud = 600;
- clk_div = WC_BAUD_DR384;
- }
- if (baud == 230400)
- clk_div = WC_BAUD_DR1;
- tty_termios_encode_baud_rate(termios, baud, baud);
- }
-
- new_conf = (new_conf & ~WC_BAUD_DIV_MASK) | clk_div;
-
- if (unlikely(termios->c_cflag & CMSPAR))
- termios->c_cflag &= ~CMSPAR;
-
- if (termios->c_cflag & CSTOPB)
- new_conf |= WC_2_STOPBITS;
- else
- new_conf &= ~WC_2_STOPBITS;
-
- if (termios->c_cflag & PARENB) {
- new_conf |= WC_PARITY_ENABLE;
- parity |= UART_LCR_PARITY;
- } else
- new_conf &= ~WC_PARITY_ENABLE;
-
- if (!(termios->c_cflag & PARODD))
- parity |= UART_LCR_EPAR;
- max->parity = parity;
-
- uart_update_timeout(port, termios->c_cflag, baud);
-
- new_conf |= WC_TAG;
- if (new_conf != max->cur_conf) {
- if (!max3110_out(max, new_conf)) {
- max->cur_conf = new_conf;
- max->baud = baud;
- }
- }
-}
-
-/* Don't handle hw handshaking */
-static unsigned int serial_m3110_get_mctrl(struct uart_port *port)
-{
- return TIOCM_DSR | TIOCM_CAR | TIOCM_DSR;
-}
-
-static void serial_m3110_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
-}
-
-static void serial_m3110_break_ctl(struct uart_port *port, int break_state)
-{
-}
-
-static void serial_m3110_pm(struct uart_port *port, unsigned int state,
- unsigned int oldstate)
-{
-}
-
-static struct uart_ops serial_m3110_ops = {
- .tx_empty = serial_m3110_tx_empty,
- .set_mctrl = serial_m3110_set_mctrl,
- .get_mctrl = serial_m3110_get_mctrl,
- .stop_tx = serial_m3110_stop_tx,
- .start_tx = serial_m3110_start_tx,
- .stop_rx = serial_m3110_stop_rx,
- .break_ctl = serial_m3110_break_ctl,
- .startup = serial_m3110_startup,
- .shutdown = serial_m3110_shutdown,
- .set_termios = serial_m3110_set_termios,
- .pm = serial_m3110_pm,
- .type = serial_m3110_type,
- .release_port = serial_m3110_release_port,
- .request_port = serial_m3110_request_port,
- .config_port = serial_m3110_config_port,
- .verify_port = serial_m3110_verify_port,
-};
-
-static struct uart_driver serial_m3110_reg = {
- .owner = THIS_MODULE,
- .driver_name = "MRST serial",
- .dev_name = "ttyS",
- .major = TTY_MAJOR,
- .minor = 64,
- .nr = 1,
- .cons = &serial_m3110_console,
-};
-
-#ifdef CONFIG_PM_SLEEP
-static int serial_m3110_suspend(struct device *dev)
-{
- struct spi_device *spi = to_spi_device(dev);
- struct uart_max3110 *max = spi_get_drvdata(spi);
-
- if (max->irq > 0)
- disable_irq(max->irq);
- uart_suspend_port(&serial_m3110_reg, &max->port);
- max3110_out(max, max->cur_conf | WC_SW_SHDI);
- return 0;
-}
-
-static int serial_m3110_resume(struct device *dev)
-{
- struct spi_device *spi = to_spi_device(dev);
- struct uart_max3110 *max = spi_get_drvdata(spi);
-
- max3110_out(max, max->cur_conf);
- uart_resume_port(&serial_m3110_reg, &max->port);
- if (max->irq > 0)
- enable_irq(max->irq);
- return 0;
-}
-
-static SIMPLE_DEV_PM_OPS(serial_m3110_pm_ops, serial_m3110_suspend,
- serial_m3110_resume);
-#define SERIAL_M3110_PM_OPS (&serial_m3110_pm_ops)
-
-#else
-#define SERIAL_M3110_PM_OPS NULL
-#endif
-
-static int serial_m3110_probe(struct spi_device *spi)
-{
- struct uart_max3110 *max;
- void *buffer;
- u16 res;
- int ret = 0;
-
- max = kzalloc(sizeof(*max), GFP_KERNEL);
- if (!max)
- return -ENOMEM;
-
- /* Set spi info */
- spi->bits_per_word = 16;
- max->clock = MAX3110_HIGH_CLK;
-
- spi_setup(spi);
-
- max->port.type = PORT_MAX3100;
- max->port.fifosize = 2; /* Only have 16b buffer */
- max->port.ops = &serial_m3110_ops;
- max->port.line = 0;
- max->port.dev = &spi->dev;
- max->port.uartclk = 115200;
-
- max->spi = spi;
- strcpy(max->name, spi->modalias);
- max->irq = (u16)spi->irq;
-
- mutex_init(&max->thread_mutex);
- mutex_init(&max->io_mutex);
-
- max->word_7bits = 0;
- max->parity = 0;
- max->baud = 0;
-
- max->cur_conf = 0;
- max->uart_flags = 0;
-
- /* Check if reading configuration register returns something sane */
-
- res = RC_TAG;
- ret = max3110_write_then_read(max, (u8 *)&res, (u8 *)&res, 2, 0);
- if (ret < 0 || res == 0 || res == 0xffff) {
- dev_dbg(&spi->dev, "MAX3111 deemed not present (conf reg %04x)",
- res);
- ret = -ENODEV;
- goto err_get_page;
- }
-
- buffer = (void *)__get_free_page(GFP_KERNEL);
- if (!buffer) {
- ret = -ENOMEM;
- goto err_get_page;
- }
- max->con_xmit.buf = buffer;
- max->con_xmit.head = 0;
- max->con_xmit.tail = 0;
-
- init_waitqueue_head(&max->wq);
-
- max->main_thread = kthread_run(max3110_main_thread,
- max, "max3110_main");
- if (IS_ERR(max->main_thread)) {
- ret = PTR_ERR(max->main_thread);
- goto err_kthread;
- }
-
- if (max->irq) {
- ret = request_irq(max->irq, serial_m3110_irq,
- IRQ_TYPE_EDGE_FALLING, "max3110", max);
- if (ret) {
- max->irq = 0;
- dev_warn(&spi->dev,
- "unable to allocate IRQ, will use polling method\n");
- }
- }
-
- spi_set_drvdata(spi, max);
- pmax = max;
-
- /* Give membase a psudo value to pass serial_core's check */
- max->port.membase = (unsigned char __iomem *)0xff110000;
- uart_add_one_port(&serial_m3110_reg, &max->port);
-
- return 0;
-
-err_kthread:
- free_page((unsigned long)buffer);
-err_get_page:
- kfree(max);
- return ret;
-}
-
-static int serial_m3110_remove(struct spi_device *dev)
-{
- struct uart_max3110 *max = spi_get_drvdata(dev);
-
- if (!max)
- return 0;
-
- uart_remove_one_port(&serial_m3110_reg, &max->port);
-
- free_page((unsigned long)max->con_xmit.buf);
-
- if (max->irq)
- free_irq(max->irq, max);
-
- if (max->main_thread)
- kthread_stop(max->main_thread);
-
- kfree(max);
- return 0;
-}
-
-static struct spi_driver uart_max3110_driver = {
- .driver = {
- .name = "spi_max3111",
- .owner = THIS_MODULE,
- .pm = SERIAL_M3110_PM_OPS,
- },
- .probe = serial_m3110_probe,
- .remove = serial_m3110_remove,
-};
-
-static int __init serial_m3110_init(void)
-{
- int ret = 0;
-
- ret = uart_register_driver(&serial_m3110_reg);
- if (ret)
- return ret;
-
- ret = spi_register_driver(&uart_max3110_driver);
- if (ret)
- uart_unregister_driver(&serial_m3110_reg);
-
- return ret;
-}
-
-static void __exit serial_m3110_exit(void)
-{
- spi_unregister_driver(&uart_max3110_driver);
- uart_unregister_driver(&serial_m3110_reg);
-}
-
-module_init(serial_m3110_init);
-module_exit(serial_m3110_exit);
-
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("spi:max3110-uart");
projects / cascardo / linux.git / commitdiff