drivers/ide/palm_bk3710.c - kernel/msm-4.9 - Gitiles

 /*
  * Palmchip bk3710 IDE controller
  *
  * Copyright (C) 2006 Texas Instruments.
  * Copyright (C) 2007 MontaVista Software, Inc., <source@mvista.com>
  *
  * ----------------------------------------------------------------------------
  *
  * 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/types.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/ioport.h>
 #include <linux/ide.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/clk.h>
 #include <linux/platform_device.h>

 /* Offset of the primary interface registers */
 #define IDE_PALM_ATA_PRI_REG_OFFSET 0x1F0

 /* Primary Control Offset */
 #define IDE_PALM_ATA_PRI_CTL_OFFSET 0x3F6

 #define BK3710_BMICP		0x00
 #define BK3710_BMISP		0x02
 #define BK3710_BMIDTP		0x04
 #define BK3710_IDETIMP		0x40
 #define BK3710_IDESTATUS	0x47
 #define BK3710_UDMACTL		0x48
 #define BK3710_MISCCTL		0x50
 #define BK3710_REGSTB		0x54
 #define BK3710_REGRCVR		0x58
 #define BK3710_DATSTB		0x5C
 #define BK3710_DATRCVR		0x60
 #define BK3710_DMASTB		0x64
 #define BK3710_DMARCVR		0x68
 #define BK3710_UDMASTB		0x6C
 #define BK3710_UDMATRP		0x70
 #define BK3710_UDMAENV		0x74
 #define BK3710_IORDYTMP		0x78

 static unsigned ideclk_period; /* in nanoseconds */

 struct palm_bk3710_udmatiming {
 	unsigned int rptime;	/* tRP -- Ready to pause time (nsec) */
 	unsigned int cycletime;	/* tCYCTYP2/2 -- avg Cycle Time (nsec) */
 				/* tENV is always a minimum of 20 nsec */
 };

 static const struct palm_bk3710_udmatiming palm_bk3710_udmatimings[6] = {
 	{ 160, 240 / 2 },	/* UDMA Mode 0 */
 	{ 125, 160 / 2 },	/* UDMA Mode 1 */
 	{ 100, 120 / 2 },	/* UDMA Mode 2 */
 	{ 100,  90 / 2 },	/* UDMA Mode 3 */
 	{ 100,  60 / 2 },	/* UDMA Mode 4 */
 	{  85,  40 / 2 },	/* UDMA Mode 5 */
 };

 static void palm_bk3710_setudmamode(void __iomem *base, unsigned int dev,
 				    unsigned int mode)
 {
 	u8 tenv, trp, t0;
 	u32 val32;
 	u16 val16;

 	/* DMA Data Setup */
 	t0 = DIV_ROUND_UP(palm_bk3710_udmatimings[mode].cycletime,
 			  ideclk_period) - 1;
 	tenv = DIV_ROUND_UP(20, ideclk_period) - 1;
 	trp = DIV_ROUND_UP(palm_bk3710_udmatimings[mode].rptime,
 			   ideclk_period) - 1;

 	/* udmastb Ultra DMA Access Strobe Width */
 	val32 = readl(base + BK3710_UDMASTB) & (0xFF << (dev ? 0 : 8));
 	val32 |= (t0 << (dev ? 8 : 0));
 	writel(val32, base + BK3710_UDMASTB);

 	/* udmatrp Ultra DMA Ready to Pause Time */
 	val32 = readl(base + BK3710_UDMATRP) & (0xFF << (dev ? 0 : 8));
 	val32 |= (trp << (dev ? 8 : 0));
 	writel(val32, base + BK3710_UDMATRP);

 	/* udmaenv Ultra DMA envelop Time */
 	val32 = readl(base + BK3710_UDMAENV) & (0xFF << (dev ? 0 : 8));
 	val32 |= (tenv << (dev ? 8 : 0));
 	writel(val32, base + BK3710_UDMAENV);

 	/* Enable UDMA for Device */
 	val16 = readw(base + BK3710_UDMACTL) | (1 << dev);
 	writew(val16, base + BK3710_UDMACTL);
 }

 static void palm_bk3710_setdmamode(void __iomem *base, unsigned int dev,
 				   unsigned short min_cycle,
 				   unsigned int mode)
 {
 	u8 td, tkw, t0;
 	u32 val32;
 	u16 val16;
 	struct ide_timing *t;
 	int cycletime;

 	t = ide_timing_find_mode(mode);
 	cycletime = max_t(int, t->cycle, min_cycle);

 	/* DMA Data Setup */
 	t0 = DIV_ROUND_UP(cycletime, ideclk_period);
 	td = DIV_ROUND_UP(t->active, ideclk_period);
 	tkw = t0 - td - 1;
 	td -= 1;

 	val32 = readl(base + BK3710_DMASTB) & (0xFF << (dev ? 0 : 8));
 	val32 |= (td << (dev ? 8 : 0));
 	writel(val32, base + BK3710_DMASTB);

 	val32 = readl(base + BK3710_DMARCVR) & (0xFF << (dev ? 0 : 8));
 	val32 |= (tkw << (dev ? 8 : 0));
 	writel(val32, base + BK3710_DMARCVR);

 	/* Disable UDMA for Device */
 	val16 = readw(base + BK3710_UDMACTL) & ~(1 << dev);
 	writew(val16, base + BK3710_UDMACTL);
 }

 static void palm_bk3710_setpiomode(void __iomem *base, ide_drive_t *mate,
 				   unsigned int dev, unsigned int cycletime,
 				   unsigned int mode)
 {
 	u8 t2, t2i, t0;
 	u32 val32;
 	struct ide_timing *t;

 	t = ide_timing_find_mode(XFER_PIO_0 + mode);

 	/* PIO Data Setup */
 	t0 = DIV_ROUND_UP(cycletime, ideclk_period);
 	t2 = DIV_ROUND_UP(t->active, ideclk_period);

 	t2i = t0 - t2 - 1;
 	t2 -= 1;

 	val32 = readl(base + BK3710_DATSTB) & (0xFF << (dev ? 0 : 8));
 	val32 |= (t2 << (dev ? 8 : 0));
 	writel(val32, base + BK3710_DATSTB);

 	val32 = readl(base + BK3710_DATRCVR) & (0xFF << (dev ? 0 : 8));
 	val32 |= (t2i << (dev ? 8 : 0));
 	writel(val32, base + BK3710_DATRCVR);

 	if (mate) {
 		u8 mode2 = ide_get_best_pio_mode(mate, 255, 4);

 		if (mode2 < mode)
 			mode = mode2;
 	}

 	/* TASKFILE Setup */
 	t0 = DIV_ROUND_UP(t->cyc8b, ideclk_period);
 	t2 = DIV_ROUND_UP(t->act8b, ideclk_period);

 	t2i = t0 - t2 - 1;
 	t2 -= 1;

 	val32 = readl(base + BK3710_REGSTB) & (0xFF << (dev ? 0 : 8));
 	val32 |= (t2 << (dev ? 8 : 0));
 	writel(val32, base + BK3710_REGSTB);

 	val32 = readl(base + BK3710_REGRCVR) & (0xFF << (dev ? 0 : 8));
 	val32 |= (t2i << (dev ? 8 : 0));
 	writel(val32, base + BK3710_REGRCVR);
 }

 static void palm_bk3710_set_dma_mode(ide_drive_t *drive, u8 xferspeed)
 {
 	int is_slave = drive->dn & 1;
 	void __iomem *base = (void *)drive->hwif->dma_base;

 	if (xferspeed >= XFER_UDMA_0) {
 		palm_bk3710_setudmamode(base, is_slave,
 					xferspeed - XFER_UDMA_0);
 	} else {
 		palm_bk3710_setdmamode(base, is_slave,
 				       drive->id[ATA_ID_EIDE_DMA_MIN],
 				       xferspeed);
 	}
 }

 static void palm_bk3710_set_pio_mode(ide_drive_t *drive, u8 pio)
 {
 	unsigned int cycle_time;
 	int is_slave = drive->dn & 1;
 	ide_drive_t *mate;
 	void __iomem *base = (void *)drive->hwif->dma_base;

 	/*
 	 * Obtain the drive PIO data for tuning the Palm Chip registers
 	 */
 	cycle_time = ide_pio_cycle_time(drive, pio);
 	mate = ide_get_pair_dev(drive);
 	palm_bk3710_setpiomode(base, mate, is_slave, cycle_time, pio);
 }

 static void __devinit palm_bk3710_chipinit(void __iomem *base)
 {
 	/*
 	 * REVISIT:  the ATA reset signal needs to be managed through a
 	 * GPIO, which means it should come from platform_data.  Until
 	 * we get and use such information, we have to trust that things
 	 * have been reset before we get here.
 	 */

 	/*
 	 * Program the IDETIMP Register Value based on the following assumptions
 	 *
 	 * (ATA_IDETIMP_IDEEN		, ENABLE ) |
 	 * (ATA_IDETIMP_PREPOST1	, DISABLE) |
 	 * (ATA_IDETIMP_PREPOST0	, DISABLE) |
 	 *
 	 * DM6446 silicon rev 2.1 and earlier have no observed net benefit
 	 * from enabling prefetch/postwrite.
 	 */
 	writew(BIT(15), base + BK3710_IDETIMP);

 	/*
 	 * UDMACTL Ultra-ATA DMA Control
 	 * (ATA_UDMACTL_UDMAP1	, 0 ) |
 	 * (ATA_UDMACTL_UDMAP0	, 0 )
 	 *
 	 */
 	writew(0, base + BK3710_UDMACTL);

 	/*
 	 * MISCCTL Miscellaneous Conrol Register
 	 * (ATA_MISCCTL_HWNHLD1P	, 1 cycle)
 	 * (ATA_MISCCTL_HWNHLD0P	, 1 cycle)
 	 * (ATA_MISCCTL_TIMORIDE	, 1)
 	 */
 	writel(0x001, base + BK3710_MISCCTL);

 	/*
 	 * IORDYTMP IORDY Timer for Primary Register
 	 * (ATA_IORDYTMP_IORDYTMP     , 0xffff  )
 	 */
 	writel(0xFFFF, base + BK3710_IORDYTMP);

 	/*
 	 * Configure BMISP Register
 	 * (ATA_BMISP_DMAEN1	, DISABLE )	|
 	 * (ATA_BMISP_DMAEN0	, DISABLE )	|
 	 * (ATA_BMISP_IORDYINT	, CLEAR)	|
 	 * (ATA_BMISP_INTRSTAT	, CLEAR)	|
 	 * (ATA_BMISP_DMAERROR	, CLEAR)
 	 */
 	writew(0, base + BK3710_BMISP);

 	palm_bk3710_setpiomode(base, NULL, 0, 600, 0);
 	palm_bk3710_setpiomode(base, NULL, 1, 600, 0);
 }

 static u8 palm_bk3710_cable_detect(ide_hwif_t *hwif)
 {
 	return ATA_CBL_PATA80;
 }

 static int __devinit palm_bk3710_init_dma(ide_hwif_t *hwif,
 					  const struct ide_port_info *d)
 {
 	printk(KERN_INFO "    %s: MMIO-DMA\n", hwif->name);

 	if (ide_allocate_dma_engine(hwif))
 		return -1;

 	hwif->dma_base = hwif->io_ports.data_addr - IDE_PALM_ATA_PRI_REG_OFFSET;

 	return 0;
 }

 static const struct ide_port_ops palm_bk3710_ports_ops = {
 	.set_pio_mode		= palm_bk3710_set_pio_mode,
 	.set_dma_mode		= palm_bk3710_set_dma_mode,
 	.cable_detect		= palm_bk3710_cable_detect,
 };

 static struct ide_port_info __devinitdata palm_bk3710_port_info = {
 	.init_dma		= palm_bk3710_init_dma,
 	.port_ops		= &palm_bk3710_ports_ops,
 	.dma_ops		= &sff_dma_ops,
 	.host_flags		= IDE_HFLAG_MMIO,
 	.pio_mask		= ATA_PIO4,
 	.mwdma_mask		= ATA_MWDMA2,
 	.chipset		= ide_palm3710,
 };

 static int __init palm_bk3710_probe(struct platform_device *pdev)
 {
 	struct clk *clk;
 	struct resource *mem, *irq;
 	void __iomem *base;
 	unsigned long rate, mem_size;
 	int i, rc;
 	struct ide_hw hw, *hws[] = { &hw };

 	clk = clk_get(&pdev->dev, "IDECLK");
 	if (IS_ERR(clk))
 		return -ENODEV;

 	clk_enable(clk);
 	rate = clk_get_rate(clk);

 	/* NOTE:  round *down* to meet minimum timings; we count in clocks */
 	ideclk_period = 1000000000UL / rate;

 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (mem == NULL) {
 		printk(KERN_ERR "failed to get memory region resource\n");
 		return -ENODEV;
 	}

 	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (irq == NULL) {
 		printk(KERN_ERR "failed to get IRQ resource\n");
 		return -ENODEV;
 	}

 	mem_size = mem->end - mem->start + 1;
 	if (request_mem_region(mem->start, mem_size, "palm_bk3710") == NULL) {
 		printk(KERN_ERR "failed to request memory region\n");
 		return -EBUSY;
 	}

 	base = ioremap(mem->start, mem_size);
 	if (!base) {
 		printk(KERN_ERR "failed to map IO memory\n");
 		release_mem_region(mem->start, mem_size);
 		return -ENOMEM;
 	}

 	/* Configure the Palm Chip controller */
 	palm_bk3710_chipinit(base);

 	memset(&hw, 0, sizeof(hw));
 	for (i = 0; i < IDE_NR_PORTS - 2; i++)
 		hw.io_ports_array[i] = (unsigned long)
 				(base + IDE_PALM_ATA_PRI_REG_OFFSET + i);
 	hw.io_ports.ctl_addr = (unsigned long)
 			(base + IDE_PALM_ATA_PRI_CTL_OFFSET);
 	hw.irq = irq->start;
 	hw.dev = &pdev->dev;

 	palm_bk3710_port_info.udma_mask = rate < 100000000 ? ATA_UDMA4 :
 							     ATA_UDMA5;

 	/* Register the IDE interface with Linux */
 	rc = ide_host_add(&palm_bk3710_port_info, hws, 1, NULL);
 	if (rc)
 		goto out;

 	return 0;
 out:
 	printk(KERN_WARNING "Palm Chip BK3710 IDE Register Fail\n");
 	return rc;
 }

 /* work with hotplug and coldplug */
 MODULE_ALIAS("platform:palm_bk3710");

 static struct platform_driver platform_bk_driver = {
 	.driver = {
 		.name = "palm_bk3710",
 		.owner = THIS_MODULE,
 	},
 };

 static int __init palm_bk3710_init(void)
 {
 	return platform_driver_probe(&platform_bk_driver, palm_bk3710_probe);
 }

 module_init(palm_bk3710_init);
 MODULE_LICENSE("GPL");
	/*
	* Palmchip bk3710 IDE controller
	*
	* Copyright (C) 2006 Texas Instruments.
	* Copyright (C) 2007 MontaVista Software, Inc., <source@mvista.com>
	*
	* ----------------------------------------------------------------------------
	*
	* 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/types.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/ioport.h>
	#include <linux/ide.h>
	#include <linux/delay.h>
	#include <linux/init.h>
	#include <linux/clk.h>
	#include <linux/platform_device.h>

	/* Offset of the primary interface registers */
	#define IDE_PALM_ATA_PRI_REG_OFFSET 0x1F0

	/* Primary Control Offset */
	#define IDE_PALM_ATA_PRI_CTL_OFFSET 0x3F6

	#define BK3710_BMICP 0x00
	#define BK3710_BMISP 0x02
	#define BK3710_BMIDTP 0x04
	#define BK3710_IDETIMP 0x40
	#define BK3710_IDESTATUS 0x47
	#define BK3710_UDMACTL 0x48
	#define BK3710_MISCCTL 0x50
	#define BK3710_REGSTB 0x54
	#define BK3710_REGRCVR 0x58
	#define BK3710_DATSTB 0x5C
	#define BK3710_DATRCVR 0x60
	#define BK3710_DMASTB 0x64
	#define BK3710_DMARCVR 0x68
	#define BK3710_UDMASTB 0x6C
	#define BK3710_UDMATRP 0x70
	#define BK3710_UDMAENV 0x74
	#define BK3710_IORDYTMP 0x78

	static unsigned ideclk_period; /* in nanoseconds */

	struct palm_bk3710_udmatiming {
	unsigned int rptime; /* tRP -- Ready to pause time (nsec) */
	unsigned int cycletime; /* tCYCTYP2/2 -- avg Cycle Time (nsec) */
	/* tENV is always a minimum of 20 nsec */
	};

	static const struct palm_bk3710_udmatiming palm_bk3710_udmatimings[6] = {
	{ 160, 240 / 2 }, /* UDMA Mode 0 */
	{ 125, 160 / 2 }, /* UDMA Mode 1 */
	{ 100, 120 / 2 }, /* UDMA Mode 2 */
	{ 100, 90 / 2 }, /* UDMA Mode 3 */
	{ 100, 60 / 2 }, /* UDMA Mode 4 */
	{ 85, 40 / 2 }, /* UDMA Mode 5 */
	};

	static void palm_bk3710_setudmamode(void __iomem *base, unsigned int dev,
	unsigned int mode)
	{
	u8 tenv, trp, t0;
	u32 val32;
	u16 val16;

	/* DMA Data Setup */
	t0 = DIV_ROUND_UP(palm_bk3710_udmatimings[mode].cycletime,
	ideclk_period) - 1;
	tenv = DIV_ROUND_UP(20, ideclk_period) - 1;
	trp = DIV_ROUND_UP(palm_bk3710_udmatimings[mode].rptime,
	ideclk_period) - 1;

	/* udmastb Ultra DMA Access Strobe Width */
	val32 = readl(base + BK3710_UDMASTB) & (0xFF << (dev ? 0 : 8));
	val32 \|= (t0 << (dev ? 8 : 0));
	writel(val32, base + BK3710_UDMASTB);

	/* udmatrp Ultra DMA Ready to Pause Time */
	val32 = readl(base + BK3710_UDMATRP) & (0xFF << (dev ? 0 : 8));
	val32 \|= (trp << (dev ? 8 : 0));
	writel(val32, base + BK3710_UDMATRP);

	/* udmaenv Ultra DMA envelop Time */
	val32 = readl(base + BK3710_UDMAENV) & (0xFF << (dev ? 0 : 8));
	val32 \|= (tenv << (dev ? 8 : 0));
	writel(val32, base + BK3710_UDMAENV);

	/* Enable UDMA for Device */
	val16 = readw(base + BK3710_UDMACTL) \| (1 << dev);
	writew(val16, base + BK3710_UDMACTL);
	}

	static void palm_bk3710_setdmamode(void __iomem *base, unsigned int dev,
	unsigned short min_cycle,
	unsigned int mode)
	{
	u8 td, tkw, t0;
	u32 val32;
	u16 val16;
	struct ide_timing *t;
	int cycletime;

	t = ide_timing_find_mode(mode);
	cycletime = max_t(int, t->cycle, min_cycle);

	/* DMA Data Setup */
	t0 = DIV_ROUND_UP(cycletime, ideclk_period);
	td = DIV_ROUND_UP(t->active, ideclk_period);
	tkw = t0 - td - 1;
	td -= 1;

	val32 = readl(base + BK3710_DMASTB) & (0xFF << (dev ? 0 : 8));
	val32 \|= (td << (dev ? 8 : 0));
	writel(val32, base + BK3710_DMASTB);

	val32 = readl(base + BK3710_DMARCVR) & (0xFF << (dev ? 0 : 8));
	val32 \|= (tkw << (dev ? 8 : 0));
	writel(val32, base + BK3710_DMARCVR);

	/* Disable UDMA for Device */
	val16 = readw(base + BK3710_UDMACTL) & ~(1 << dev);
	writew(val16, base + BK3710_UDMACTL);
	}

	static void palm_bk3710_setpiomode(void __iomem base, ide_drive_t mate,
	unsigned int dev, unsigned int cycletime,
	unsigned int mode)
	{
	u8 t2, t2i, t0;
	u32 val32;
	struct ide_timing *t;

	t = ide_timing_find_mode(XFER_PIO_0 + mode);

	/* PIO Data Setup */
	t0 = DIV_ROUND_UP(cycletime, ideclk_period);
	t2 = DIV_ROUND_UP(t->active, ideclk_period);

	t2i = t0 - t2 - 1;
	t2 -= 1;

	val32 = readl(base + BK3710_DATSTB) & (0xFF << (dev ? 0 : 8));
	val32 \|= (t2 << (dev ? 8 : 0));
	writel(val32, base + BK3710_DATSTB);

	val32 = readl(base + BK3710_DATRCVR) & (0xFF << (dev ? 0 : 8));
	val32 \|= (t2i << (dev ? 8 : 0));
	writel(val32, base + BK3710_DATRCVR);

	if (mate) {
	u8 mode2 = ide_get_best_pio_mode(mate, 255, 4);

	if (mode2 < mode)
	mode = mode2;
	}

	/* TASKFILE Setup */
	t0 = DIV_ROUND_UP(t->cyc8b, ideclk_period);
	t2 = DIV_ROUND_UP(t->act8b, ideclk_period);

	t2i = t0 - t2 - 1;
	t2 -= 1;

	val32 = readl(base + BK3710_REGSTB) & (0xFF << (dev ? 0 : 8));
	val32 \|= (t2 << (dev ? 8 : 0));
	writel(val32, base + BK3710_REGSTB);

	val32 = readl(base + BK3710_REGRCVR) & (0xFF << (dev ? 0 : 8));
	val32 \|= (t2i << (dev ? 8 : 0));
	writel(val32, base + BK3710_REGRCVR);
	}

	static void palm_bk3710_set_dma_mode(ide_drive_t *drive, u8 xferspeed)
	{
	int is_slave = drive->dn & 1;
	void __iomem base = (void )drive->hwif->dma_base;

	if (xferspeed >= XFER_UDMA_0) {
	palm_bk3710_setudmamode(base, is_slave,
	xferspeed - XFER_UDMA_0);
	} else {
	palm_bk3710_setdmamode(base, is_slave,
	drive->id[ATA_ID_EIDE_DMA_MIN],
	xferspeed);
	}
	}

	static void palm_bk3710_set_pio_mode(ide_drive_t *drive, u8 pio)
	{
	unsigned int cycle_time;
	int is_slave = drive->dn & 1;
	ide_drive_t *mate;
	void __iomem base = (void )drive->hwif->dma_base;

	/*
	* Obtain the drive PIO data for tuning the Palm Chip registers
	*/
	cycle_time = ide_pio_cycle_time(drive, pio);
	mate = ide_get_pair_dev(drive);
	palm_bk3710_setpiomode(base, mate, is_slave, cycle_time, pio);
	}

	static void __devinit palm_bk3710_chipinit(void __iomem *base)
	{
	/*
	* REVISIT: the ATA reset signal needs to be managed through a
	* GPIO, which means it should come from platform_data. Until
	* we get and use such information, we have to trust that things
	* have been reset before we get here.
	*/

	/*
	* Program the IDETIMP Register Value based on the following assumptions
	*
	* (ATA_IDETIMP_IDEEN , ENABLE ) \|
	* (ATA_IDETIMP_PREPOST1 , DISABLE) \|
	* (ATA_IDETIMP_PREPOST0 , DISABLE) \|
	*
	* DM6446 silicon rev 2.1 and earlier have no observed net benefit
	* from enabling prefetch/postwrite.
	*/
	writew(BIT(15), base + BK3710_IDETIMP);

	/*
	* UDMACTL Ultra-ATA DMA Control
	* (ATA_UDMACTL_UDMAP1 , 0 ) \|
	* (ATA_UDMACTL_UDMAP0 , 0 )
	*
	*/
	writew(0, base + BK3710_UDMACTL);

	/*
	* MISCCTL Miscellaneous Conrol Register
	* (ATA_MISCCTL_HWNHLD1P , 1 cycle)
	* (ATA_MISCCTL_HWNHLD0P , 1 cycle)
	* (ATA_MISCCTL_TIMORIDE , 1)
	*/
	writel(0x001, base + BK3710_MISCCTL);

	/*
	* IORDYTMP IORDY Timer for Primary Register
	* (ATA_IORDYTMP_IORDYTMP , 0xffff )
	*/
	writel(0xFFFF, base + BK3710_IORDYTMP);

	/*
	* Configure BMISP Register
	* (ATA_BMISP_DMAEN1 , DISABLE ) \|
	* (ATA_BMISP_DMAEN0 , DISABLE ) \|
	* (ATA_BMISP_IORDYINT , CLEAR) \|
	* (ATA_BMISP_INTRSTAT , CLEAR) \|
	* (ATA_BMISP_DMAERROR , CLEAR)
	*/
	writew(0, base + BK3710_BMISP);

	palm_bk3710_setpiomode(base, NULL, 0, 600, 0);
	palm_bk3710_setpiomode(base, NULL, 1, 600, 0);
	}

	static u8 palm_bk3710_cable_detect(ide_hwif_t *hwif)
	{
	return ATA_CBL_PATA80;
	}

	static int __devinit palm_bk3710_init_dma(ide_hwif_t *hwif,
	const struct ide_port_info *d)
	{
	printk(KERN_INFO " %s: MMIO-DMA\n", hwif->name);

	if (ide_allocate_dma_engine(hwif))
	return -1;

	hwif->dma_base = hwif->io_ports.data_addr - IDE_PALM_ATA_PRI_REG_OFFSET;

	return 0;
	}

	static const struct ide_port_ops palm_bk3710_ports_ops = {
	.set_pio_mode = palm_bk3710_set_pio_mode,
	.set_dma_mode = palm_bk3710_set_dma_mode,
	.cable_detect = palm_bk3710_cable_detect,
	};

	static struct ide_port_info __devinitdata palm_bk3710_port_info = {
	.init_dma = palm_bk3710_init_dma,
	.port_ops = &palm_bk3710_ports_ops,
	.dma_ops = &sff_dma_ops,
	.host_flags = IDE_HFLAG_MMIO,
	.pio_mask = ATA_PIO4,
	.mwdma_mask = ATA_MWDMA2,
	.chipset = ide_palm3710,
	};

	static int __init palm_bk3710_probe(struct platform_device *pdev)
	{
	struct clk *clk;
	struct resource mem, irq;
	void __iomem *base;
	unsigned long rate, mem_size;
	int i, rc;
	struct ide_hw hw, *hws[] = { &hw };

	clk = clk_get(&pdev->dev, "IDECLK");
	if (IS_ERR(clk))
	return -ENODEV;

	clk_enable(clk);
	rate = clk_get_rate(clk);

	/* NOTE: round down to meet minimum timings; we count in clocks */
	ideclk_period = 1000000000UL / rate;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (mem == NULL) {
	printk(KERN_ERR "failed to get memory region resource\n");
	return -ENODEV;
	}

	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (irq == NULL) {
	printk(KERN_ERR "failed to get IRQ resource\n");
	return -ENODEV;
	}

	mem_size = mem->end - mem->start + 1;
	if (request_mem_region(mem->start, mem_size, "palm_bk3710") == NULL) {
	printk(KERN_ERR "failed to request memory region\n");
	return -EBUSY;
	}

	base = ioremap(mem->start, mem_size);
	if (!base) {
	printk(KERN_ERR "failed to map IO memory\n");
	release_mem_region(mem->start, mem_size);
	return -ENOMEM;
	}

	/* Configure the Palm Chip controller */
	palm_bk3710_chipinit(base);

	memset(&hw, 0, sizeof(hw));
	for (i = 0; i < IDE_NR_PORTS - 2; i++)
	hw.io_ports_array[i] = (unsigned long)
	(base + IDE_PALM_ATA_PRI_REG_OFFSET + i);
	hw.io_ports.ctl_addr = (unsigned long)
	(base + IDE_PALM_ATA_PRI_CTL_OFFSET);
	hw.irq = irq->start;
	hw.dev = &pdev->dev;

	palm_bk3710_port_info.udma_mask = rate < 100000000 ? ATA_UDMA4 :
	ATA_UDMA5;

	/* Register the IDE interface with Linux */
	rc = ide_host_add(&palm_bk3710_port_info, hws, 1, NULL);
	if (rc)
	goto out;

	return 0;
	out:
	printk(KERN_WARNING "Palm Chip BK3710 IDE Register Fail\n");
	return rc;
	}

	/* work with hotplug and coldplug */
	MODULE_ALIAS("platform:palm_bk3710");

	static struct platform_driver platform_bk_driver = {
	.driver = {
	.name = "palm_bk3710",
	.owner = THIS_MODULE,
	},
	};

	static int __init palm_bk3710_init(void)
	{
	return platform_driver_probe(&platform_bk_driver, palm_bk3710_probe);
	}

	module_init(palm_bk3710_init);
	MODULE_LICENSE("GPL");