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Commit 28502848 authored by Atsushi Nemoto's avatar Atsushi Nemoto Committed by Bartlomiej Zolnierkiewicz
Browse files

ide: Add tx4938ide driver (v2) 



This is the driver for the Toshiba TX4938 SoC EBUS controller ATA mode.
It has custom set_pio_mode and some hacks for big endian.

Signed-off-by: default avatarAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: ralf@linux-mips.org
Cc: sshtylyov@ru.mvista.com
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
parent 5d1d2f8c

drivers/ide/Kconfig

+5 −0
Original line number Original line Diff line number Diff line
@@ -720,6 +720,11 @@ config BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ 
       default "128"

       default "128"

       depends on BLK_DEV_IDE_AU1XXX

       depends on BLK_DEV_IDE_AU1XXX





config BLK_DEV_IDE_TX4938

	tristate "TX4938 internal IDE support"

	depends on SOC_TX4938

	select IDE_TIMINGS



config BLK_DEV_IDE_TX4939

config BLK_DEV_IDE_TX4939

	tristate "TX4939 internal IDE support"

	tristate "TX4939 internal IDE support"

	depends on SOC_TX4939

	depends on SOC_TX4939

drivers/ide/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -112,4 +112,5 @@ obj-$(CONFIG_BLK_DEV_PALMCHIP_BK3710) += palm_bk3710.o 




obj-$(CONFIG_BLK_DEV_IDE_AU1XXX)	+= au1xxx-ide.o

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_TX4939)	+= tx4939ide.o

drivers/ide/tx4938ide.c

0 → 100644
+310 −0
Original line number Original line Diff line number Diff line 
/*

 * TX4938 internal IDE driver

 * Based on tx4939ide.c.

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * (C) Copyright TOSHIBA CORPORATION 2005-2007

 */



#include <linux/module.h>

#include <linux/types.h>

#include <linux/ide.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/io.h>

#include <asm/txx9/tx4938.h>



static void tx4938ide_tune_ebusc(unsigned int ebus_ch,

				 unsigned int gbus_clock,

				 u8 pio)

{

	struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);

	u64 cr = __raw_readq(&tx4938_ebuscptr->cr[ebus_ch]);

	unsigned int sp = (cr >> 4) & 3;

	unsigned int clock = gbus_clock / (4 - sp);

	unsigned int cycle = 1000000000 / clock;

	unsigned int wt, shwt;



	/* Minimum DIOx- active time */

	wt = DIV_ROUND_UP(t->act8b, cycle) - 2;

	/* IORDY setup time: 35ns */

	wt = max(wt, DIV_ROUND_UP(35, cycle));

	/* actual wait-cycle is max(wt & ~1, 1) */

	if (wt > 2 && (wt & 1))

		wt++;

	wt &= ~1;

	/* Address-valid to DIOR/DIOW setup */

	shwt = DIV_ROUND_UP(t->setup, cycle);



	pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n",

		 ebus_ch, cycle, wt, shwt);



	__raw_writeq((cr & ~(0x3f007ull)) | (wt << 12) | shwt,

		     &tx4938_ebuscptr->cr[ebus_ch]);

}



static void tx4938ide_set_pio_mode(ide_drive_t *drive, const u8 pio)

{

	ide_hwif_t *hwif = drive->hwif;

	struct tx4938ide_platform_info *pdata = hwif->dev->platform_data;

	u8 safe = pio;

	ide_drive_t *pair;



	pair = ide_get_pair_dev(drive);

	if (pair)

		safe = min(safe, ide_get_best_pio_mode(pair, 255, 5));

	tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe);

}



#ifdef __BIG_ENDIAN



/* custom iops (independent from SWAP_IO_SPACE) */

static u8 tx4938ide_inb(unsigned long port)

{

	return __raw_readb((void __iomem *)port);

}



static void tx4938ide_outb(u8 value, unsigned long port)

{

	__raw_writeb(value, (void __iomem *)port);

}



static void tx4938ide_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;



		/* no endian swap */

		__raw_writew(data, (void __iomem *)io_ports->data_addr);

	}



	if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)

		tx4938ide_outb(tf->hob_feature, io_ports->feature_addr);

	if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)

		tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr);

	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)

		tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr);

	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)

		tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr);

	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)

		tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr);



	if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)

		tx4938ide_outb(tf->feature, io_ports->feature_addr);

	if (task->tf_flags & IDE_TFLAG_OUT_NSECT)

		tx4938ide_outb(tf->nsect, io_ports->nsect_addr);

	if (task->tf_flags & IDE_TFLAG_OUT_LBAL)

		tx4938ide_outb(tf->lbal, io_ports->lbal_addr);

	if (task->tf_flags & IDE_TFLAG_OUT_LBAM)

		tx4938ide_outb(tf->lbam, io_ports->lbam_addr);

	if (task->tf_flags & IDE_TFLAG_OUT_LBAH)

		tx4938ide_outb(tf->lbah, io_ports->lbah_addr);



	if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)

		tx4938ide_outb((tf->device & HIHI) | drive->select,

			       io_ports->device_addr);

}



static void tx4938ide_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;



		/* no endian swap */

		data = __raw_readw((void __iomem *)io_ports->data_addr);

		tf->data = data & 0xff;

		tf->hob_data = (data >> 8) & 0xff;

	}



	/* be sure we're looking at the low order bits */

	tx4938ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);



	if (task->tf_flags & IDE_TFLAG_IN_FEATURE)

		tf->feature = tx4938ide_inb(io_ports->feature_addr);

	if (task->tf_flags & IDE_TFLAG_IN_NSECT)

		tf->nsect  = tx4938ide_inb(io_ports->nsect_addr);

	if (task->tf_flags & IDE_TFLAG_IN_LBAL)

		tf->lbal   = tx4938ide_inb(io_ports->lbal_addr);

	if (task->tf_flags & IDE_TFLAG_IN_LBAM)

		tf->lbam   = tx4938ide_inb(io_ports->lbam_addr);

	if (task->tf_flags & IDE_TFLAG_IN_LBAH)

		tf->lbah   = tx4938ide_inb(io_ports->lbah_addr);

	if (task->tf_flags & IDE_TFLAG_IN_DEVICE)

		tf->device = tx4938ide_inb(io_ports->device_addr);



	if (task->tf_flags & IDE_TFLAG_LBA48) {

		tx4938ide_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);



		if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)

			tf->hob_feature =

				tx4938ide_inb(io_ports->feature_addr);

		if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)

			tf->hob_nsect   = tx4938ide_inb(io_ports->nsect_addr);

		if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)

			tf->hob_lbal    = tx4938ide_inb(io_ports->lbal_addr);

		if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)

			tf->hob_lbam    = tx4938ide_inb(io_ports->lbam_addr);

		if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)

			tf->hob_lbah    = tx4938ide_inb(io_ports->lbah_addr);

	}

}



static void tx4938ide_input_data_swap(ide_drive_t *drive, struct request *rq,

				void *buf, unsigned int len)

{

	unsigned long port = drive->hwif->io_ports.data_addr;

	unsigned short *ptr = buf;

	unsigned int count = (len + 1) / 2;



	while (count--)

		*ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));

	__ide_flush_dcache_range((unsigned long)buf, count * 2);

}



static void tx4938ide_output_data_swap(ide_drive_t *drive, struct request *rq,

				void *buf, unsigned int len)

{

	unsigned long port = drive->hwif->io_ports.data_addr;

	unsigned short *ptr = buf;

	unsigned int count = (len + 1) / 2;



	while (count--) {

		__raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);

		ptr++;

	}

	__ide_flush_dcache_range((unsigned long)buf, count * 2);

}



static const struct ide_tp_ops tx4938ide_tp_ops = {

	.exec_command		= ide_exec_command,

	.read_status		= ide_read_status,

	.read_altstatus		= ide_read_altstatus,

	.read_sff_dma_status	= ide_read_sff_dma_status,



	.set_irq		= ide_set_irq,



	.tf_load		= tx4938ide_tf_load,

	.tf_read		= tx4938ide_tf_read,



	.input_data		= tx4938ide_input_data_swap,

	.output_data		= tx4938ide_output_data_swap,

};



#endif	/* __BIG_ENDIAN */



static const struct ide_port_ops tx4938ide_port_ops = {

	.set_pio_mode = tx4938ide_set_pio_mode,

};



static const struct ide_port_info tx4938ide_port_info __initdata = {

	.port_ops = &tx4938ide_port_ops,

#ifdef __BIG_ENDIAN

	.tp_ops = &tx4938ide_tp_ops,

#endif

	.host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,

	.pio_mask = ATA_PIO5,

};



static int __init tx4938ide_probe(struct platform_device *pdev)

{

	hw_regs_t hw;

	hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };

	struct ide_host *host;

	struct resource *res;

	struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;

	int irq, ret, i;

	unsigned long mapbase;

	struct ide_port_info d = tx4938ide_port_info;



	irq = platform_get_irq(pdev, 0);

	if (irq < 0)

		return -ENODEV;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res)

		return -ENODEV;



	if (!devm_request_mem_region(&pdev->dev, res->start,

				     res->end - res->start + 1, "tx4938ide"))

		return -EBUSY;

	mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,

					      res->end - res->start + 1);

	if (!mapbase)

		return -EBUSY;



	memset(&hw, 0, sizeof(hw));

	if (pdata->ioport_shift) {

		unsigned long port = mapbase;



		hw.io_ports_array[0] = port;

#ifdef __BIG_ENDIAN

		port++;

#endif

		for (i = 1; i <= 7; i++)

			hw.io_ports_array[i] =

				port + (i << pdata->ioport_shift);

		hw.io_ports.ctl_addr =

			port + 0x10000 + (6 << pdata->ioport_shift);

	} else

		ide_std_init_ports(&hw, mapbase, mapbase + 0x10006);

	hw.irq = irq;

	hw.dev = &pdev->dev;



	pr_info("TX4938 IDE interface (base %#lx, irq %d)\n", mapbase, hw.irq);

	if (pdata->gbus_clock)

		tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0);

	else

		d.port_ops = NULL;

	ret = ide_host_add(&d, hws, &host);

	if (ret)

		return ret;

	platform_set_drvdata(pdev, host);

	return 0;

}



static int __exit tx4938ide_remove(struct platform_device *pdev)

{

	struct ide_host *host = platform_get_drvdata(pdev);



	ide_host_remove(host);

	return 0;

}



static struct platform_driver tx4938ide_driver = {

	.driver		= {

		.name	= "tx4938ide",

		.owner	= THIS_MODULE,

	},

	.remove = __exit_p(tx4938ide_remove),

};



static int __init tx4938ide_init(void)

{

	return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);

}



static void __exit tx4938ide_exit(void)

{

	platform_driver_unregister(&tx4938ide_driver);

}



module_init(tx4938ide_init);

module_exit(tx4938ide_exit);



MODULE_DESCRIPTION("TX4938 internal IDE driver");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:tx4938ide");