Subject: [PATCH 1/1] at91: drop ide driver in favor of the pata one

From: [email-masked] (Nicolas Ferre)
Date: Thu, 26 Jan 2012 16:57:18 +0100

On 12/15/2011 02:29 PM, Jean-Christophe PLAGNIOL-VILLARD :
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <[email-masked]>
> Cc: Nicolas Ferre <[email-masked]>

Acked-by: Nicolas Ferre <[email-masked]>

I queue it for at91-next

Thanks,

> Cc: linux-ide at vger.kernel.org
> Cc: "David S. Miller" <[email-masked]>
> ---
>  arch/arm/mach-at91/at91sam9260_devices.c |    7 +-
>  arch/arm/mach-at91/at91sam9263_devices.c |    6 +-
>  drivers/ide/Makefile                     |    1 -
>  drivers/ide/at91_ide.c                   |  366 ------------------------------
>  4 files changed, 5 insertions(+), 375 deletions(-)
>  delete mode 100644 drivers/ide/at91_ide.c
> 
> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
> index 642ccb6..820e857 100644
> --- a/arch/arm/mach-at91/at91sam9260_devices.c
> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
> @@ -1215,8 +1215,7 @@ void __init at91_add_device_serial(void) {}
>   *  CF/IDE
>   * -------------------------------------------------------------------- */
>  
> -#if defined(CONFIG_BLK_DEV_IDE_AT91) || defined(CONFIG_BLK_DEV_IDE_AT91_MODULE) || \
> -	defined(CONFIG_PATA_AT91) || defined(CONFIG_PATA_AT91_MODULE) || \
> +#if defined(CONFIG_PATA_AT91) || defined(CONFIG_PATA_AT91_MODULE) || \
>  	defined(CONFIG_AT91_CF) || defined(CONFIG_AT91_CF_MODULE)
>  
>  static struct at91_cf_data cf0_data;
> @@ -1313,10 +1312,8 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>  	if (data->flags & AT91_CF_TRUE_IDE)
>  #if defined(CONFIG_PATA_AT91) || defined(CONFIG_PATA_AT91_MODULE)
>  		pdev->name = "pata_at91";
> -#elif defined(CONFIG_BLK_DEV_IDE_AT91) || defined(CONFIG_BLK_DEV_IDE_AT91_MODULE)
> -		pdev->name = "at91_ide";
>  #else
> -#warning "board requires AT91_CF_TRUE_IDE: enable either at91_ide or pata_at91"
> +#warning "board requires AT91_CF_TRUE_IDE: enable pata_at91"
>  #endif
>  	else
>  		pdev->name = "at91_cf";
> diff --git a/arch/arm/mach-at91/at91sam9263_devices.c b/arch/arm/mach-at91/at91sam9263_devices.c
> index 7b46b27..a61637a 100644
> --- a/arch/arm/mach-at91/at91sam9263_devices.c
> +++ b/arch/arm/mach-at91/at91sam9263_devices.c
> @@ -355,8 +355,8 @@ void __init at91_add_device_mmc(short mmc_id, struct at91_mmc_data *data) {}
>   *  Compact Flash (PCMCIA or IDE)
>   * -------------------------------------------------------------------- */
>  
> -#if defined(CONFIG_AT91_CF) || defined(CONFIG_AT91_CF_MODULE) || \
> -    defined(CONFIG_BLK_DEV_IDE_AT91) || defined(CONFIG_BLK_DEV_IDE_AT91_MODULE)
> +#if defined(CONFIG_PATA_AT91) || defined(CONFIG_PATA_AT91_MODULE) || \
> +	defined(CONFIG_AT91_CF) || defined(CONFIG_AT91_CF_MODULE)
>  
>  static struct at91_cf_data cf0_data;
>  
> @@ -450,7 +450,7 @@ void __init at91_add_device_cf(struct at91_cf_data *data)
>  	at91_set_A_periph(AT91_PIN_PD9, 0);  /* CFCE2 */
>  	at91_set_A_periph(AT91_PIN_PD14, 0); /* CFNRW */
>  
> -	pdev->name = (data->flags & AT91_CF_TRUE_IDE) ? "at91_ide" : "at91_cf";
> +	pdev->name = (data->flags & AT91_CF_TRUE_IDE) ? "pata_at91" : "at91_cf";
>  	platform_device_register(pdev);
>  }
>  #else
> diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
> index 7f879b2..af8d016 100644
> --- a/drivers/ide/Makefile
> +++ b/drivers/ide/Makefile
> @@ -116,4 +116,3 @@ obj-$(CONFIG_BLK_DEV_IDE_AU1XXX)	+= au1xxx-ide.o
>  
>  obj-$(CONFIG_BLK_DEV_IDE_TX4938)	+= tx4938ide.o
>  obj-$(CONFIG_BLK_DEV_IDE_TX4939)	+= tx4939ide.o
> -obj-$(CONFIG_BLK_DEV_IDE_AT91)		+= at91_ide.o
> diff --git a/drivers/ide/at91_ide.c b/drivers/ide/at91_ide.c
> deleted file mode 100644
> index 41d4155..0000000
> --- a/drivers/ide/at91_ide.c
> +++ /dev/null
> @@ -1,366 +0,0 @@
> -/*
> - * 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 <[email-masked]>");
> -

-- 
Nicolas Ferre