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Commit 918d7b7c authored by Sergey Matyukevich's avatar Sergey Matyukevich Committed by Jeff Garzik
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[libata] PATA driver for CF interface on AT91SAM9260 SoC 



This patch provides PATA driver for CompactFlash interface in True IDE
mode on AT91SAM9260 SoC.

Signed-off-by: default avatarSergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent ad5d8eac

drivers/ata/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -679,6 +679,14 @@ config PATA_PLATFORM 


	  If unsure, say N.



config PATA_AT91

	tristate "PATA support for AT91SAM9260"

	depends on ARM && ARCH_AT91

	help

	  This option enables support for IDE devices on the Atmel AT91SAM9260 SoC.



	  If unsure, say N.



config PATA_OF_PLATFORM

	tristate "OpenFirmware platform device PATA support"

	depends on PATA_PLATFORM && PPC_OF

drivers/ata/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -72,6 +72,7 @@ obj-$(CONFIG_PATA_SCH) += pata_sch.o 
obj-$(CONFIG_PATA_BF54X)	+= pata_bf54x.o

obj-$(CONFIG_PATA_OCTEON_CF)	+= pata_octeon_cf.o

obj-$(CONFIG_PATA_PLATFORM)	+= pata_platform.o

obj-$(CONFIG_PATA_AT91)	+= pata_at91.o

obj-$(CONFIG_PATA_OF_PLATFORM)	+= pata_of_platform.o

obj-$(CONFIG_PATA_ICSIDE)	+= pata_icside.o

# Should be last but two libata driver

drivers/ata/pata_at91.c

0 → 100644
+361 −0
Original line number Diff line number Diff line 
/*

 * PATA driver for AT91SAM9260 Static Memory Controller

 * with CompactFlash interface in True IDE mode

 *

 * Copyright (C) 2009 Matyukevich Sergey

 *

 * Based on:

 *      * generic platform driver by Paul Mundt: drivers/ata/pata_platform.c

 *      * pata_at32 driver by Kristoffer Nyborg Gregertsen

 *      * at91_ide driver by Stanislaw Gruszka

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2

 * as published by the Free Software Foundation.

 *

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/blkdev.h>

#include <scsi/scsi_host.h>

#include <linux/ata.h>

#include <linux/clk.h>

#include <linux/libata.h>

#include <linux/platform_device.h>

#include <linux/ata_platform.h>



#include <mach/at91sam9260_matrix.h>

#include <mach/at91sam9_smc.h>

#include <mach/at91sam9260.h>

#include <mach/board.h>

#include <mach/gpio.h>





#define DRV_NAME "pata_at91"

#define DRV_VERSION "0.1"



#define CF_IDE_OFFSET	    0x00c00000

#define CF_ALT_IDE_OFFSET   0x00e00000

#define CF_IDE_RES_SIZE     0x08



struct at91_ide_info {

	unsigned long mode;

	unsigned int cs;



	void __iomem *ide_addr;

	void __iomem *alt_addr;

};



const struct ata_timing initial_timing =

	{XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0};



static unsigned int calc_mck_cycles(unsigned int ns, unsigned int mck_hz)

{

	unsigned long mul;



    /*

     * cycles = x [nsec] * f [Hz] / 10^9 [ns in sec] =

     *     x * (f / 1_000_000_000) =

     *     x * ((f * 65536) / 1_000_000_000) / 65536 =

     *     x * (((f / 10_000) * 65536) / 100_000) / 65536 =

     */



    mul = (mck_hz / 10000) << 16;

    mul /= 100000;



    return (ns * mul + 65536) >> 16;    /* rounding */

}



static void set_smc_mode(struct at91_ide_info *info)

{

    at91_sys_write(AT91_SMC_MODE(info->cs), info->mode);

    return;

}



static void set_smc_timing(struct device *dev,

		struct at91_ide_info *info, const struct ata_timing *ata)

{

	int read_cycle, write_cycle, active, recover;

	int nrd_setup, nrd_pulse, nrd_recover;

	int nwe_setup, nwe_pulse;



	int ncs_write_setup, ncs_write_pulse;

	int ncs_read_setup, ncs_read_pulse;



	unsigned int mck_hz;

	struct clk *mck;



	read_cycle  = ata->cyc8b;

	nrd_setup   = ata->setup;

	nrd_pulse   = ata->act8b;

	nrd_recover = ata->rec8b;



	mck = clk_get(NULL, "mck");

	BUG_ON(IS_ERR(mck));

	mck_hz = clk_get_rate(mck);



	read_cycle  = calc_mck_cycles(read_cycle, mck_hz);

	nrd_setup   = calc_mck_cycles(nrd_setup, mck_hz);

	nrd_pulse   = calc_mck_cycles(nrd_pulse, mck_hz);

	nrd_recover = calc_mck_cycles(nrd_recover, mck_hz);



	clk_put(mck);



	active  = nrd_setup + nrd_pulse;

	recover = read_cycle - active;



	/* Need at least two cycles recovery */

	if (recover < 2)

		read_cycle = active + 2;



	/* (CS0, CS1, DIR, OE) <= (CFCE1, CFCE2, CFRNW, NCSX) timings */

	ncs_read_setup = 1;

	ncs_read_pulse = read_cycle - 2;



	/* Write timings same as read timings */

	write_cycle = read_cycle;

	nwe_setup = nrd_setup;

	nwe_pulse = nrd_pulse;

	ncs_write_setup = ncs_read_setup;

	ncs_write_pulse = ncs_read_pulse;



	dev_dbg(dev, "ATA timings: nrd_setup = %d nrd_pulse = %d nrd_cycle = %d\n",

			nrd_setup, nrd_pulse, read_cycle);

	dev_dbg(dev, "ATA timings: nwe_setup = %d nwe_pulse = %d nwe_cycle = %d\n",

			nwe_setup, nwe_pulse, write_cycle);

	dev_dbg(dev, "ATA timings: ncs_read_setup = %d ncs_read_pulse = %d\n",

			ncs_read_setup, ncs_read_pulse);

	dev_dbg(dev, "ATA timings: ncs_write_setup = %d ncs_write_pulse = %d\n",

			ncs_write_setup, ncs_write_pulse);



	at91_sys_write(AT91_SMC_SETUP(info->cs),

			AT91_SMC_NWESETUP_(nwe_setup) |

			AT91_SMC_NRDSETUP_(nrd_setup) |

			AT91_SMC_NCS_WRSETUP_(ncs_write_setup) |

			AT91_SMC_NCS_RDSETUP_(ncs_read_setup));



	at91_sys_write(AT91_SMC_PULSE(info->cs),

			AT91_SMC_NWEPULSE_(nwe_pulse) |

			AT91_SMC_NRDPULSE_(nrd_pulse) |

			AT91_SMC_NCS_WRPULSE_(ncs_write_pulse) |

			AT91_SMC_NCS_RDPULSE_(ncs_read_pulse));



	at91_sys_write(AT91_SMC_CYCLE(info->cs),

			AT91_SMC_NWECYCLE_(write_cycle) |

			AT91_SMC_NRDCYCLE_(read_cycle));



	return;

}



static void pata_at91_set_piomode(struct ata_port *ap, struct ata_device *adev)

{

	struct at91_ide_info *info = ap->host->private_data;

	struct ata_timing timing;

	int ret;



	/* Compute ATA timing and set it to SMC */

	ret = ata_timing_compute(adev, adev->pio_mode, &timing, 1000, 0);

	if (ret) {

		dev_warn(ap->dev, "Failed to compute ATA timing %d, \

				set PIO_0 timing\n", ret);

		set_smc_timing(ap->dev, info, &initial_timing);

	} else {

		set_smc_timing(ap->dev, info, &timing);

	}



	/* Setup SMC mode */

	set_smc_mode(info);



	return;

}



static unsigned int pata_at91_data_xfer_noirq(struct ata_device *dev,

		unsigned char *buf, unsigned int buflen, int rw)

{

	struct at91_ide_info *info = dev->link->ap->host->private_data;

	unsigned int consumed;

	unsigned long flags;

	unsigned int mode;



	local_irq_save(flags);

	mode = at91_sys_read(AT91_SMC_MODE(info->cs));



	/* set 16bit mode before writing data */

	at91_sys_write(AT91_SMC_MODE(info->cs),

			(mode & ~AT91_SMC_DBW) | AT91_SMC_DBW_16);



	consumed = ata_sff_data_xfer(dev, buf, buflen, rw);



	/* restore 8bit mode after data is written */

	at91_sys_write(AT91_SMC_MODE(info->cs),

			(mode & ~AT91_SMC_DBW) | AT91_SMC_DBW_8);



	local_irq_restore(flags);

	return consumed;

}



static struct scsi_host_template pata_at91_sht = {

	ATA_PIO_SHT(DRV_NAME),

};



static struct ata_port_operations pata_at91_port_ops = {

	.inherits	= &ata_sff_port_ops,



	.sff_data_xfer	= pata_at91_data_xfer_noirq,

	.set_piomode	= pata_at91_set_piomode,

	.cable_detect	= ata_cable_40wire,

	.port_start	= ATA_OP_NULL,

};



static int __devinit pata_at91_probe(struct platform_device *pdev)

{

	struct at91_cf_data *board = pdev->dev.platform_data;

	struct device *dev = &pdev->dev;

	struct at91_ide_info *info;

	struct resource *mem_res;

	struct ata_host *host;

	struct ata_port *ap;

	int irq_flags = 0;

	int irq = 0;

	int ret;



	/*  get platform resources: IO/CTL memories and irq/rst pins */



	if (pdev->num_resources != 1) {

		dev_err(&pdev->dev, "invalid number of resources\n");

		return -EINVAL;

	}



	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);



	if (!mem_res) {

		dev_err(dev, "failed to get mem resource\n");

		return -EINVAL;

	}



	irq = board->irq_pin;



	/* init ata host */



	host = ata_host_alloc(dev, 1);



	if (!host)

		return -ENOMEM;



	ap = host->ports[0];

	ap->ops = &pata_at91_port_ops;

	ap->flags |= ATA_FLAG_SLAVE_POSS;

	ap->pio_mask = ATA_PIO4;



	if (!irq) {

		ap->flags |= ATA_FLAG_PIO_POLLING;

		ata_port_desc(ap, "no IRQ, using PIO polling");

	}



	info = kzalloc(sizeof(*info), GFP_KERNEL);



	if (!info) {

		dev_err(dev, "failed to allocate memory for private data\n");

		return -ENOMEM;

	}



	info->cs    = board->chipselect;

	info->mode  = AT91_SMC_READMODE | AT91_SMC_WRITEMODE |

		AT91_SMC_EXNWMODE_READY | AT91_SMC_BAT_SELECT |

		AT91_SMC_DBW_8 | AT91_SMC_TDF_(0);



	info->ide_addr = devm_ioremap(dev,

			mem_res->start + CF_IDE_OFFSET, CF_IDE_RES_SIZE);



	if (!info->ide_addr) {

		dev_err(dev, "failed to map IO base\n");

		ret = -ENOMEM;

		goto err_ide_ioremap;

	}



	info->alt_addr = devm_ioremap(dev,

			mem_res->start + CF_ALT_IDE_OFFSET, CF_IDE_RES_SIZE);



	if (!info->alt_addr) {

		dev_err(dev, "failed to map CTL base\n");

		ret = -ENOMEM;

		goto err_alt_ioremap;

	}



	ap->ioaddr.cmd_addr = info->ide_addr;

	ap->ioaddr.ctl_addr = info->alt_addr + 0x06;

	ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;



	ata_sff_std_ports(&ap->ioaddr);



	ata_port_desc(ap, "mmio cmd 0x%llx ctl 0x%llx",

			(unsigned long long)mem_res->start + CF_IDE_OFFSET,

			(unsigned long long)mem_res->start + CF_ALT_IDE_OFFSET);



	host->private_data = info;



	return ata_host_activate(host, irq ? gpio_to_irq(irq) : 0,

			irq ? ata_sff_interrupt : NULL,

			irq_flags, &pata_at91_sht);



err_alt_ioremap:

	devm_iounmap(dev, info->ide_addr);



err_ide_ioremap:

	kfree(info);



	return ret;

}



static int __devexit pata_at91_remove(struct platform_device *pdev)

{

	struct ata_host *host = dev_get_drvdata(&pdev->dev);

	struct at91_ide_info *info = host->private_data;

	struct device *dev = &pdev->dev;



	if (!host)

		return 0;



	ata_host_detach(host);



	if (!info)

		return 0;



	devm_iounmap(dev, info->ide_addr);

	devm_iounmap(dev, info->alt_addr);



	kfree(info);

	return 0;

}



static struct platform_driver pata_at91_driver = {

	.probe		= pata_at91_probe,

	.remove		= __devexit_p(pata_at91_remove),

	.driver 	= {

		.name		= DRV_NAME,

		.owner		= THIS_MODULE,

	},

};



static int __init pata_at91_init(void)

{

	return platform_driver_register(&pata_at91_driver);

}



static void __exit pata_at91_exit(void)

{

	platform_driver_unregister(&pata_at91_driver);

}





module_init(pata_at91_init);

module_exit(pata_at91_exit);





MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("Driver for CF in True IDE mode on AT91SAM9260 SoC");

MODULE_AUTHOR("Matyukevich Sergey");

MODULE_VERSION(DRV_VERSION);