1 files changed, 467 insertions, 0 deletions

diff --git a/drivers/ide/at91_ide.c b/drivers/ide/at91_ide.c
new file mode 100644
index 0000000..1bb50f4
--- /dev/null
+++ b/drivers/ide/at91_ide.c
@@ -0,0 +1,467 @@
+/*
+ * 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/version.h>
+#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 <mach/gpio.h>
+#include <mach/at91sam9263.h>
+#include <mach/at91sam9_smc.h>
+#include <mach/at91sam9263_matrix.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 request *rq,
+				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);
+	__ide_mm_insw((void __iomem *) io_ports->data_addr, buf, len / 2);
+	leave_16bit(chipselect, mode);
+}
+
+static void at91_ide_output_data(ide_drive_t *drive, struct request *rq,
+				 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);
+	__ide_mm_outsw((void __iomem *) io_ports->data_addr, buf, len / 2);
+	leave_16bit(chipselect, mode);
+}
+
+static u8 ide_mm_inb(unsigned long port)
+{
+	return readb((void __iomem *) port);
+}
+
+static void ide_mm_outb(u8 value, unsigned long port)
+{
+	writeb(value, (void __iomem *) port);
+}
+
+static void at91_ide_tf_load(ide_drive_t *drive, ide_task_t *task)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	struct ide_io_ports *io_ports = &hwif->io_ports;
+	struct ide_taskfile *tf = &task->tf;
+	u8 HIHI = (task->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;
+
+	if (task->tf_flags & IDE_TFLAG_FLAGGED)
+		HIHI = 0xFF;
+
+	if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
+		u16 data = (tf->hob_data << 8) | tf->data;
+
+		at91_ide_output_data(drive, NULL, &data, 2);
+	}
+
+	if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
+		ide_mm_outb(tf->hob_feature, io_ports->feature_addr);
+	if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
+		ide_mm_outb(tf->hob_nsect, io_ports->nsect_addr);
+	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
+		ide_mm_outb(tf->hob_lbal, io_ports->lbal_addr);
+	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
+		ide_mm_outb(tf->hob_lbam, io_ports->lbam_addr);
+	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
+		ide_mm_outb(tf->hob_lbah, io_ports->lbah_addr);
+
+	if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
+		ide_mm_outb(tf->feature, io_ports->feature_addr);
+	if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
+		ide_mm_outb(tf->nsect, io_ports->nsect_addr);
+	if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
+		ide_mm_outb(tf->lbal, io_ports->lbal_addr);
+	if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
+		ide_mm_outb(tf->lbam, io_ports->lbam_addr);
+	if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
+		ide_mm_outb(tf->lbah, io_ports->lbah_addr);
+
+	if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
+		ide_mm_outb((tf->device & HIHI) | drive->select, io_ports->device_addr);
+}
+
+static void at91_ide_tf_read(ide_drive_t *drive, ide_task_t *task)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	struct ide_io_ports *io_ports = &hwif->io_ports;
+	struct ide_taskfile *tf = &task->tf;
+
+	if (task->tf_flags & IDE_TFLAG_IN_DATA) {
+		u16 data;
+
+		at91_ide_input_data(drive, NULL, &data, 2);
+		tf->data = data & 0xff;
+		tf->hob_data = (data >> 8) & 0xff;
+	}
+
+	/* be sure we're looking at the low order bits */
+	ide_mm_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
+
+	if (task->tf_flags & IDE_TFLAG_IN_FEATURE)
+		tf->feature = ide_mm_inb(io_ports->feature_addr);
+	if (task->tf_flags & IDE_TFLAG_IN_NSECT)
+		tf->nsect  = ide_mm_inb(io_ports->nsect_addr);
+	if (task->tf_flags & IDE_TFLAG_IN_LBAL)
+		tf->lbal   = ide_mm_inb(io_ports->lbal_addr);
+	if (task->tf_flags & IDE_TFLAG_IN_LBAM)
+		tf->lbam   = ide_mm_inb(io_ports->lbam_addr);
+	if (task->tf_flags & IDE_TFLAG_IN_LBAH)
+		tf->lbah   = ide_mm_inb(io_ports->lbah_addr);
+	if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
+		tf->device = ide_mm_inb(io_ports->device_addr);
+
+	if (task->tf_flags & IDE_TFLAG_LBA48) {
+		ide_mm_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
+
+		if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
+			tf->hob_feature = ide_mm_inb(io_ports->feature_addr);
+		if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
+			tf->hob_nsect   = ide_mm_inb(io_ports->nsect_addr);
+		if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
+			tf->hob_lbal    = ide_mm_inb(io_ports->lbal_addr);
+		if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
+			tf->hob_lbam    = ide_mm_inb(io_ports->lbam_addr);
+		if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
+			tf->hob_lbah    = ide_mm_inb(io_ports->lbah_addr);
+	}
+}
+
+static void at91_ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
+{
+	struct ide_timing *timing;
+	u8 chipselect = drive->hwif->select_data;
+	int use_iordy = 0;
+
+	pdbg("chipselect %u pio %u\n", chipselect, pio);
+
+	timing = ide_timing_find_mode(XFER_PIO_0 + pio);
+	BUG_ON(!timing);
+
+	if ((pio > 2 || ata_id_has_iordy(drive->id)) &&
+	    !(ata_id_is_cfa(drive->id) && pio > 4))
+		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,
+	.set_irq	= ide_set_irq,
+
+	.tf_load	= at91_ide_tf_load,
+	.tf_read	= at91_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_PIO5,
+};
+
+/*
+ * 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;
+	hw_regs_t hw;
+	hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };
+	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.chipset = ide_generic;
+	hw.dev = &pdev->dev;
+
+	host = ide_host_alloc(&at91_ide_port_info, hws);
+	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 (board->irq_pin >= PIN_BASE)
+		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>");
+