+++ /dev/null
-/*
- * IDE host driver for AT91 (SAM9, CAP9, AT572D940HF) Static Memory Controller
- * with Compact Flash True IDE logic
- *
- * Copyright (c) 2008, 2009 Kelvatek Ltd.
- *
- * 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.
- *
- * This program is distributed in the hope that 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/clk.h>
-#include <linux/err.h>
-#include <linux/ide.h>
-#include <linux/platform_device.h>
-
-#include <mach/board.h>
-#include <asm/gpio.h>
-#include <mach/at91sam9_smc.h>
-
-#define DRV_NAME "at91_ide"
-
-#define perr(fmt, args...) pr_err(DRV_NAME ": " fmt, ##args)
-#define pdbg(fmt, args...) pr_debug("%s " fmt, __func__, ##args)
-
-/*
- * Access to IDE device is possible through EBI Static Memory Controller
- * with Compact Flash logic. For details see EBI and SMC datasheet sections
- * of any microcontroller from AT91SAM9 family.
- *
- * Within SMC chip select address space, lines A[23:21] distinguish Compact
- * Flash modes (I/O, common memory, attribute memory, True IDE). IDE modes are:
- * 0x00c0000 - True IDE
- * 0x00e0000 - Alternate True IDE (Alt Status Register)
- *
- * On True IDE mode Task File and Data Register are mapped at the same address.
- * To distinguish access between these two different bus data width is used:
- * 8Bit for Task File, 16Bit for Data I/O.
- *
- * After initialization we do 8/16 bit flipping (changes in SMC MODE register)
- * only inside IDE callback routines which are serialized by IDE layer,
- * so no additional locking needed.
- */
-
-#define TASK_FILE 0x00c00000
-#define ALT_MODE 0x00e00000
-#define REGS_SIZE 8
-
-#define enter_16bit(cs, mode) do { \
- mode = at91_sys_read(AT91_SMC_MODE(cs)); \
- at91_sys_write(AT91_SMC_MODE(cs), mode | AT91_SMC_DBW_16); \
-} while (0)
-
-#define leave_16bit(cs, mode) at91_sys_write(AT91_SMC_MODE(cs), mode);
-
-static void set_smc_timings(const u8 chipselect, const u16 cycle,
- const u16 setup, const u16 pulse,
- const u16 data_float, int use_iordy)
-{
- unsigned long mode = AT91_SMC_READMODE | AT91_SMC_WRITEMODE |
- AT91_SMC_BAT_SELECT;
-
- /* disable or enable waiting for IORDY signal */
- if (use_iordy)
- mode |= AT91_SMC_EXNWMODE_READY;
-
- /* add data float cycles if needed */
- if (data_float)
- mode |= AT91_SMC_TDF_(data_float);
-
- at91_sys_write(AT91_SMC_MODE(chipselect), mode);
-
- /* setup timings in SMC */
- at91_sys_write(AT91_SMC_SETUP(chipselect), AT91_SMC_NWESETUP_(setup) |
- AT91_SMC_NCS_WRSETUP_(0) |
- AT91_SMC_NRDSETUP_(setup) |
- AT91_SMC_NCS_RDSETUP_(0));
- at91_sys_write(AT91_SMC_PULSE(chipselect), AT91_SMC_NWEPULSE_(pulse) |
- AT91_SMC_NCS_WRPULSE_(cycle) |
- AT91_SMC_NRDPULSE_(pulse) |
- AT91_SMC_NCS_RDPULSE_(cycle));
- at91_sys_write(AT91_SMC_CYCLE(chipselect), AT91_SMC_NWECYCLE_(cycle) |
- AT91_SMC_NRDCYCLE_(cycle));
-}
-
-static unsigned int calc_mck_cycles(unsigned int ns, unsigned int mck_hz)
-{
- u64 tmp = ns;
-
- tmp *= mck_hz;
- tmp += 1000*1000*1000 - 1; /* round up */
- do_div(tmp, 1000*1000*1000);
- return (unsigned int) tmp;
-}
-
-static void apply_timings(const u8 chipselect, const u8 pio,
- const struct ide_timing *timing, int use_iordy)
-{
- unsigned int t0, t1, t2, t6z;
- unsigned int cycle, setup, pulse, data_float;
- unsigned int mck_hz;
- struct clk *mck;
-
- /* see table 22 of Compact Flash standard 4.1 for the meaning,
- * we do not stretch active (t2) time, so setup (t1) + hold time (th)
- * assure at least minimal recovery (t2i) time */
- t0 = timing->cyc8b;
- t1 = timing->setup;
- t2 = timing->act8b;
- t6z = (pio < 5) ? 30 : 20;
-
- pdbg("t0=%u t1=%u t2=%u t6z=%u\n", t0, t1, t2, t6z);
-
- mck = clk_get(NULL, "mck");
- BUG_ON(IS_ERR(mck));
- mck_hz = clk_get_rate(mck);
- pdbg("mck_hz=%u\n", mck_hz);
-
- cycle = calc_mck_cycles(t0, mck_hz);
- setup = calc_mck_cycles(t1, mck_hz);
- pulse = calc_mck_cycles(t2, mck_hz);
- data_float = calc_mck_cycles(t6z, mck_hz);
-
- pdbg("cycle=%u setup=%u pulse=%u data_float=%u\n",
- cycle, setup, pulse, data_float);
-
- set_smc_timings(chipselect, cycle, setup, pulse, data_float, use_iordy);
-}
-
-static void at91_ide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
- void *buf, unsigned int len)
-{
- ide_hwif_t *hwif = drive->hwif;
- struct ide_io_ports *io_ports = &hwif->io_ports;
- u8 chipselect = hwif->select_data;
- unsigned long mode;
-
- pdbg("cs %u buf %p len %d\n", chipselect, buf, len);
-
- len++;
-
- enter_16bit(chipselect, mode);
- readsw((void __iomem *)io_ports->data_addr, buf, len / 2);
- leave_16bit(chipselect, mode);
-}
-
-static void at91_ide_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
- void *buf, unsigned int len)
-{
- ide_hwif_t *hwif = drive->hwif;
- struct ide_io_ports *io_ports = &hwif->io_ports;
- u8 chipselect = hwif->select_data;
- unsigned long mode;
-
- pdbg("cs %u buf %p len %d\n", chipselect, buf, len);
-
- enter_16bit(chipselect, mode);
- writesw((void __iomem *)io_ports->data_addr, buf, len / 2);
- leave_16bit(chipselect, mode);
-}
-
-static void at91_ide_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
-{
- struct ide_timing *timing;
- u8 chipselect = hwif->select_data;
- int use_iordy = 0;
- const u8 pio = drive->pio_mode - XFER_PIO_0;
-
- pdbg("chipselect %u pio %u\n", chipselect, pio);
-
- timing = ide_timing_find_mode(XFER_PIO_0 + pio);
- BUG_ON(!timing);
-
- if (ide_pio_need_iordy(drive, pio))
- use_iordy = 1;
-
- apply_timings(chipselect, pio, timing, use_iordy);
-}
-
-static const struct ide_tp_ops at91_ide_tp_ops = {
- .exec_command = ide_exec_command,
- .read_status = ide_read_status,
- .read_altstatus = ide_read_altstatus,
- .write_devctl = ide_write_devctl,
-
- .dev_select = ide_dev_select,
- .tf_load = ide_tf_load,
- .tf_read = ide_tf_read,
-
- .input_data = at91_ide_input_data,
- .output_data = at91_ide_output_data,
-};
-
-static const struct ide_port_ops at91_ide_port_ops = {
- .set_pio_mode = at91_ide_set_pio_mode,
-};
-
-static const struct ide_port_info at91_ide_port_info __initdata = {
- .port_ops = &at91_ide_port_ops,
- .tp_ops = &at91_ide_tp_ops,
- .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA | IDE_HFLAG_SINGLE |
- IDE_HFLAG_NO_IO_32BIT | IDE_HFLAG_UNMASK_IRQS,
- .pio_mask = ATA_PIO6,
- .chipset = ide_generic,
-};
-
-/*
- * If interrupt is delivered through GPIO, IRQ are triggered on falling
- * and rising edge of signal. Whereas IDE device request interrupt on high
- * level (rising edge in our case). This mean we have fake interrupts, so
- * we need to check interrupt pin and exit instantly from ISR when line
- * is on low level.
- */
-
-irqreturn_t at91_irq_handler(int irq, void *dev_id)
-{
- int ntries = 8;
- int pin_val1, pin_val2;
-
- /* additional deglitch, line can be noisy in badly designed PCB */
- do {
- pin_val1 = at91_get_gpio_value(irq);
- pin_val2 = at91_get_gpio_value(irq);
- } while (pin_val1 != pin_val2 && --ntries > 0);
-
- if (pin_val1 == 0 || ntries <= 0)
- return IRQ_HANDLED;
-
- return ide_intr(irq, dev_id);
-}
-
-static int __init at91_ide_probe(struct platform_device *pdev)
-{
- int ret;
- struct ide_hw hw, *hws[] = { &hw };
- struct ide_host *host;
- struct resource *res;
- unsigned long tf_base = 0, ctl_base = 0;
- struct at91_cf_data *board = pdev->dev.platform_data;
-
- if (!board)
- return -ENODEV;
-
- if (board->det_pin && at91_get_gpio_value(board->det_pin) != 0) {
- perr("no device detected\n");
- return -ENODEV;
- }
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- perr("can't get memory resource\n");
- return -ENODEV;
- }
-
- if (!devm_request_mem_region(&pdev->dev, res->start + TASK_FILE,
- REGS_SIZE, "ide") ||
- !devm_request_mem_region(&pdev->dev, res->start + ALT_MODE,
- REGS_SIZE, "alt")) {
- perr("memory resources in use\n");
- return -EBUSY;
- }
-
- pdbg("chipselect %u irq %u res %08lx\n", board->chipselect,
- board->irq_pin, (unsigned long) res->start);
-
- tf_base = (unsigned long) devm_ioremap(&pdev->dev, res->start + TASK_FILE,
- REGS_SIZE);
- ctl_base = (unsigned long) devm_ioremap(&pdev->dev, res->start + ALT_MODE,
- REGS_SIZE);
- if (!tf_base || !ctl_base) {
- perr("can't map memory regions\n");
- return -EBUSY;
- }
-
- memset(&hw, 0, sizeof(hw));
-
- if (board->flags & AT91_IDE_SWAP_A0_A2) {
- /* workaround for stupid hardware bug */
- hw.io_ports.data_addr = tf_base + 0;
- hw.io_ports.error_addr = tf_base + 4;
- hw.io_ports.nsect_addr = tf_base + 2;
- hw.io_ports.lbal_addr = tf_base + 6;
- hw.io_ports.lbam_addr = tf_base + 1;
- hw.io_ports.lbah_addr = tf_base + 5;
- hw.io_ports.device_addr = tf_base + 3;
- hw.io_ports.command_addr = tf_base + 7;
- hw.io_ports.ctl_addr = ctl_base + 3;
- } else
- ide_std_init_ports(&hw, tf_base, ctl_base + 6);
-
- hw.irq = board->irq_pin;
- hw.dev = &pdev->dev;
-
- host = ide_host_alloc(&at91_ide_port_info, hws, 1);
- if (!host) {
- perr("failed to allocate ide host\n");
- return -ENOMEM;
- }
-
- /* setup Static Memory Controller - PIO 0 as default */
- apply_timings(board->chipselect, 0, ide_timing_find_mode(XFER_PIO_0), 0);
-
- /* with GPIO interrupt we have to do quirks in handler */
- if (gpio_is_valid(board->irq_pin))
- host->irq_handler = at91_irq_handler;
-
- host->ports[0]->select_data = board->chipselect;
-
- ret = ide_host_register(host, &at91_ide_port_info, hws);
- if (ret) {
- perr("failed to register ide host\n");
- goto err_free_host;
- }
- platform_set_drvdata(pdev, host);
- return 0;
-
-err_free_host:
- ide_host_free(host);
- return ret;
-}
-
-static int __exit at91_ide_remove(struct platform_device *pdev)
-{
- struct ide_host *host = platform_get_drvdata(pdev);
-
- ide_host_remove(host);
- return 0;
-}
-
-static struct platform_driver at91_ide_driver = {
- .driver = {
- .name = DRV_NAME,
- .owner = THIS_MODULE,
- },
- .remove = __exit_p(at91_ide_remove),
-};
-
-static int __init at91_ide_init(void)
-{
- return platform_driver_probe(&at91_ide_driver, at91_ide_probe);
-}
-
-static void __exit at91_ide_exit(void)
-{
- platform_driver_unregister(&at91_ide_driver);
-}
-
-module_init(at91_ide_init);
-module_exit(at91_ide_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Stanislaw Gruszka <stf_xl@wp.pl>");
-
projects / cascardo / linux.git / commitdiff