Blackfin: add driver for on-chip ATAPI controller

This is a port of the Linux Blackfin on-chip ATAPI driver to U-Boot.

Signed-off-by: Sonic Zhang <Sonic.Zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 1201 insertions, 0 deletions

diff --git a/drivers/block/pata_bfin.c b/drivers/block/pata_bfin.c
new file mode 100644
index 0000000..f16dabe
--- /dev/null
+++ b/drivers/block/pata_bfin.c
@@ -0,0 +1,1201 @@
+/*
+ * Driver for Blackfin on-chip ATAPI controller.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Copyright (c) 2008 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <config.h>
+#include <asm/byteorder.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/mach-common/bits/pata.h>
+#include <ata.h>
+#include <libata.h>
+#include "pata_bfin.h"
+
+static struct ata_port port[CONFIG_SYS_SATA_MAX_DEVICE];
+
+/**
+ * PIO Mode - Frequency compatibility
+ */
+/* mode: 0         1         2         3         4 */
+static const u32 pio_fsclk[] =
+{ 33333333, 33333333, 33333333, 33333333, 33333333 };
+
+/**
+ * MDMA Mode - Frequency compatibility
+ */
+/*               mode:      0         1         2        */
+static const u32 mdma_fsclk[] = { 33333333, 33333333, 33333333 };
+
+/**
+ * UDMA Mode - Frequency compatibility
+ *
+ * UDMA5 - 100 MB/s   - SCLK  = 133 MHz
+ * UDMA4 - 66 MB/s    - SCLK >=  80 MHz
+ * UDMA3 - 44.4 MB/s  - SCLK >=  50 MHz
+ * UDMA2 - 33 MB/s    - SCLK >=  40 MHz
+ */
+/* mode: 0         1         2         3         4          5 */
+static const u32 udma_fsclk[] =
+{ 33333333, 33333333, 40000000, 50000000, 80000000, 133333333 };
+
+/**
+ * Register transfer timing table
+ */
+/*               mode:       0    1    2    3    4    */
+/* Cycle Time                     */
+static const u32 reg_t0min[]   = { 600, 383, 330, 180, 120 };
+/* DIOR/DIOW to end cycle         */
+static const u32 reg_t2min[]   = { 290, 290, 290, 70,  25  };
+/* DIOR/DIOW asserted pulse width */
+static const u32 reg_teocmin[] = { 290, 290, 290, 80,  70  };
+
+/**
+ * PIO timing table
+ */
+/*               mode:       0    1    2    3    4    */
+/* Cycle Time                     */
+static const u32 pio_t0min[]   = { 600, 383, 240, 180, 120 };
+/* Address valid to DIOR/DIORW    */
+static const u32 pio_t1min[]   = { 70,  50,  30,  30,  25  };
+/* DIOR/DIOW to end cycle         */
+static const u32 pio_t2min[]   = { 165, 125, 100, 80,  70  };
+/* DIOR/DIOW asserted pulse width */
+static const u32 pio_teocmin[] = { 165, 125, 100, 70,  25  };
+/* DIOW data hold                 */
+static const u32 pio_t4min[]   = { 30,  20,  15,  10,  10  };
+
+/* ******************************************************************
+ * Multiword DMA timing table
+ * ******************************************************************
+ */
+/*               mode:       0   1    2        */
+/* Cycle Time                     */
+static const u32 mdma_t0min[]  = { 480, 150, 120 };
+/* DIOR/DIOW asserted pulse width */
+static const u32 mdma_tdmin[]  = { 215, 80,  70  };
+/* DMACK to read data released    */
+static const u32 mdma_thmin[]  = { 20,  15,  10  };
+/* DIOR/DIOW to DMACK hold        */
+static const u32 mdma_tjmin[]  = { 20,  5,   5   };
+/* DIOR negated pulse width       */
+static const u32 mdma_tkrmin[] = { 50,  50,  25  };
+/* DIOR negated pulse width       */
+static const u32 mdma_tkwmin[] = { 215, 50,  25  };
+/* CS[1:0] valid to DIOR/DIOW     */
+static const u32 mdma_tmmin[]  = { 50,  30,  25  };
+/* DMACK to read data released    */
+static const u32 mdma_tzmax[]  = { 20,  25,  25  };
+
+/**
+ * Ultra DMA timing table
+ */
+/*               mode:         0    1    2    3    4    5       */
+static const u32 udma_tcycmin[]  = { 112, 73,  54,  39,  25,  17 };
+static const u32 udma_tdvsmin[]  = { 70,  48,  31,  20,  7,   5  };
+static const u32 udma_tenvmax[]  = { 70,  70,  70,  55,  55,  50 };
+static const u32 udma_trpmin[]   = { 160, 125, 100, 100, 100, 85 };
+static const u32 udma_tmin[]     = { 5,   5,   5,   5,   3,   3  };
+
+
+static const u32 udma_tmlimin = 20;
+static const u32 udma_tzahmin = 20;
+static const u32 udma_tenvmin = 20;
+static const u32 udma_tackmin = 20;
+static const u32 udma_tssmin = 50;
+
+static void msleep(int count)
+{
+	int i;
+
+	for (i = 0; i < count; i++)
+		udelay(1000);
+}
+
+/**
+ *
+ *	Function:       num_clocks_min
+ *
+ *	Description:
+ *	calculate number of SCLK cycles to meet minimum timing
+ */
+static unsigned short num_clocks_min(unsigned long tmin,
+				unsigned long fsclk)
+{
+	unsigned long tmp ;
+	unsigned short result;
+
+	tmp = tmin * (fsclk/1000/1000) / 1000;
+	result = (unsigned short)tmp;
+	if ((tmp*1000*1000) < (tmin*(fsclk/1000)))
+		result++;
+
+	return result;
+}
+
+/**
+ *	bfin_set_piomode - Initialize host controller PATA PIO timings
+ *	@ap: Port whose timings we are configuring
+ *	@pio_mode: mode
+ *
+ *	Set PIO mode for device.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+
+static void bfin_set_piomode(struct ata_port *ap, int pio_mode)
+{
+	int mode = pio_mode - XFER_PIO_0;
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+	unsigned int fsclk = get_sclk();
+	unsigned short teoc_reg, t2_reg, teoc_pio;
+	unsigned short t4_reg, t2_pio, t1_reg;
+	unsigned short n0, n6, t6min = 5;
+
+	/* the most restrictive timing value is t6 and tc, the DIOW - data hold
+	* If one SCLK pulse is longer than this minimum value then register
+	* transfers cannot be supported at this frequency.
+	*/
+	n6 = num_clocks_min(t6min, fsclk);
+	if (mode >= 0 && mode <= 4 && n6 >= 1) {
+		debug("set piomode: mode=%d, fsclk=%ud\n", mode, fsclk);
+		/* calculate the timing values for register transfers. */
+		while (mode > 0 && pio_fsclk[mode] > fsclk)
+			mode--;
+
+		/* DIOR/DIOW to end cycle time */
+		t2_reg = num_clocks_min(reg_t2min[mode], fsclk);
+		/* DIOR/DIOW asserted pulse width */
+		teoc_reg = num_clocks_min(reg_teocmin[mode], fsclk);
+		/* Cycle Time */
+		n0  = num_clocks_min(reg_t0min[mode], fsclk);
+
+		/* increase t2 until we meed the minimum cycle length */
+		if (t2_reg + teoc_reg < n0)
+			t2_reg = n0 - teoc_reg;
+
+		/* calculate the timing values for pio transfers. */
+
+		/* DIOR/DIOW to end cycle time */
+		t2_pio = num_clocks_min(pio_t2min[mode], fsclk);
+		/* DIOR/DIOW asserted pulse width */
+		teoc_pio = num_clocks_min(pio_teocmin[mode], fsclk);
+		/* Cycle Time */
+		n0  = num_clocks_min(pio_t0min[mode], fsclk);
+
+		/* increase t2 until we meed the minimum cycle length */
+		if (t2_pio + teoc_pio < n0)
+			t2_pio = n0 - teoc_pio;
+
+		/* Address valid to DIOR/DIORW */
+		t1_reg = num_clocks_min(pio_t1min[mode], fsclk);
+
+		/* DIOW data hold */
+		t4_reg = num_clocks_min(pio_t4min[mode], fsclk);
+
+		ATAPI_SET_REG_TIM_0(base, (teoc_reg<<8 | t2_reg));
+		ATAPI_SET_PIO_TIM_0(base, (t4_reg<<12 | t2_pio<<4 | t1_reg));
+		ATAPI_SET_PIO_TIM_1(base, teoc_pio);
+		if (mode > 2) {
+			ATAPI_SET_CONTROL(base,
+				ATAPI_GET_CONTROL(base) | IORDY_EN);
+		} else {
+			ATAPI_SET_CONTROL(base,
+				ATAPI_GET_CONTROL(base) & ~IORDY_EN);
+		}
+
+		/* Disable host ATAPI PIO interrupts */
+		ATAPI_SET_INT_MASK(base, ATAPI_GET_INT_MASK(base)
+			& ~(PIO_DONE_MASK | HOST_TERM_XFER_MASK));
+		SSYNC();
+	}
+}
+
+/**
+ *
+ *    Function:       wait_complete
+ *
+ *    Description:    Waits the interrupt from device
+ *
+ */
+static inline void wait_complete(void __iomem *base, unsigned short mask)
+{
+	unsigned short status;
+	unsigned int i = 0;
+
+	for (i = 0; i < PATA_BFIN_WAIT_TIMEOUT; i++) {
+		status = ATAPI_GET_INT_STATUS(base) & mask;
+		if (status)
+			break;
+	}
+
+	ATAPI_SET_INT_STATUS(base, mask);
+}
+
+/**
+ *
+ *    Function:       write_atapi_register
+ *
+ *    Description:    Writes to ATA Device Resgister
+ *
+ */
+
+static void write_atapi_register(void __iomem *base,
+		unsigned long ata_reg, unsigned short value)
+{
+	/* Program the ATA_DEV_TXBUF register with write data (to be
+	 * written into the device).
+	 */
+	ATAPI_SET_DEV_TXBUF(base, value);
+
+	/* Program the ATA_DEV_ADDR register with address of the
+	 * device register (0x01 to 0x0F).
+	 */
+	ATAPI_SET_DEV_ADDR(base, ata_reg);
+
+	/* Program the ATA_CTRL register with dir set to write (1)
+	 */
+	ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) | XFER_DIR));
+
+	/* ensure PIO DMA is not set */
+	ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) & ~PIO_USE_DMA));
+
+	/* and start the transfer */
+	ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) | PIO_START));
+
+	/* Wait for the interrupt to indicate the end of the transfer.
+	 * (We need to wait on and clear rhe ATA_DEV_INT interrupt status)
+	 */
+	wait_complete(base, PIO_DONE_INT);
+}
+
+/**
+ *
+ *	Function:       read_atapi_register
+ *
+ *Description:    Reads from ATA Device Resgister
+ *
+ */
+
+static unsigned short read_atapi_register(void __iomem *base,
+		unsigned long ata_reg)
+{
+	/* Program the ATA_DEV_ADDR register with address of the
+	 * device register (0x01 to 0x0F).
+	 */
+	ATAPI_SET_DEV_ADDR(base, ata_reg);
+
+	/* Program the ATA_CTRL register with dir set to read (0) and
+	 */
+	ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) & ~XFER_DIR));
+
+	/* ensure PIO DMA is not set */
+	ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) & ~PIO_USE_DMA));
+
+	/* and start the transfer */
+	ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) | PIO_START));
+
+	/* Wait for the interrupt to indicate the end of the transfer.
+	 * (PIO_DONE interrupt is set and it doesn't seem to matter
+	 * that we don't clear it)
+	 */
+	wait_complete(base, PIO_DONE_INT);
+
+	/* Read the ATA_DEV_RXBUF register with write data (to be
+	 * written into the device).
+	 */
+	return ATAPI_GET_DEV_RXBUF(base);
+}
+
+/**
+ *
+ *    Function:       write_atapi_register_data
+ *
+ *    Description:    Writes to ATA Device Resgister
+ *
+ */
+
+static void write_atapi_data(void __iomem *base,
+		int len, unsigned short *buf)
+{
+	int i;
+
+	/* Set transfer length to 1 */
+	ATAPI_SET_XFER_LEN(base, 1);
+
+	/* Program the ATA_DEV_ADDR register with address of the
+	 * ATA_REG_DATA
+	 */
+	ATAPI_SET_DEV_ADDR(base, ATA_REG_DATA);
+
+	/* Program the ATA_CTRL register with dir set to write (1)
+	 */
+	ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) | XFER_DIR));
+
+	/* ensure PIO DMA is not set */
+	ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) & ~PIO_USE_DMA));
+
+	for (i = 0; i < len; i++) {
+		/* Program the ATA_DEV_TXBUF register with write data (to be
+		 * written into the device).
+		 */
+		ATAPI_SET_DEV_TXBUF(base, buf[i]);
+
+		/* and start the transfer */
+		ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) | PIO_START));
+
+		/* Wait for the interrupt to indicate the end of the transfer.
+		 * (We need to wait on and clear rhe ATA_DEV_INT
+		 * interrupt status)
+		 */
+		wait_complete(base, PIO_DONE_INT);
+	}
+}
+
+/**
+ *
+ *	Function:       read_atapi_register_data
+ *
+ *	Description:    Reads from ATA Device Resgister
+ *
+ */
+
+static void read_atapi_data(void __iomem *base,
+		int len, unsigned short *buf)
+{
+	int i;
+
+	/* Set transfer length to 1 */
+	ATAPI_SET_XFER_LEN(base, 1);
+
+	/* Program the ATA_DEV_ADDR register with address of the
+	 * ATA_REG_DATA
+	 */
+	ATAPI_SET_DEV_ADDR(base, ATA_REG_DATA);
+
+	/* Program the ATA_CTRL register with dir set to read (0) and
+	 */
+	ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) & ~XFER_DIR));
+
+	/* ensure PIO DMA is not set */
+	ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) & ~PIO_USE_DMA));
+
+	for (i = 0; i < len; i++) {
+		/* and start the transfer */
+		ATAPI_SET_CONTROL(base, (ATAPI_GET_CONTROL(base) | PIO_START));
+
+		/* Wait for the interrupt to indicate the end of the transfer.
+		 * (PIO_DONE interrupt is set and it doesn't seem to matter
+		 * that we don't clear it)
+		 */
+		wait_complete(base, PIO_DONE_INT);
+
+		/* Read the ATA_DEV_RXBUF register with write data (to be
+		 * written into the device).
+		 */
+		buf[i] = ATAPI_GET_DEV_RXBUF(base);
+	}
+}
+
+/**
+ *	bfin_check_status - Read device status reg & clear interrupt
+ *	@ap: port where the device is
+ *
+ *	Note: Original code is ata_check_status().
+ */
+
+static u8 bfin_check_status(struct ata_port *ap)
+{
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+	return read_atapi_register(base, ATA_REG_STATUS);
+}
+
+/**
+ *	bfin_check_altstatus - Read device alternate status reg
+ *	@ap: port where the device is
+ */
+
+static u8 bfin_check_altstatus(struct ata_port *ap)
+{
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+	return read_atapi_register(base, ATA_REG_ALTSTATUS);
+}
+
+/**
+ *      bfin_ata_busy_wait - Wait for a port status register
+ *      @ap: Port to wait for.
+ *      @bits: bits that must be clear
+ *      @max: number of 10uS waits to perform
+ *
+ *      Waits up to max*10 microseconds for the selected bits in the port's
+ *      status register to be cleared.
+ *      Returns final value of status register.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static inline u8 bfin_ata_busy_wait(struct ata_port *ap, unsigned int bits,
+				unsigned int max, u8 usealtstatus)
+{
+	u8 status;
+
+	do {
+		udelay(10);
+		if (usealtstatus)
+			status = bfin_check_altstatus(ap);
+		else
+			status = bfin_check_status(ap);
+		max--;
+	} while (status != 0xff && (status & bits) && (max > 0));
+
+	return status;
+}
+
+/**
+ *	bfin_ata_busy_sleep - sleep until BSY clears, or timeout
+ *	@ap: port containing status register to be polled
+ *	@tmout_pat: impatience timeout in msecs
+ *	@tmout: overall timeout in msecs
+ *
+ *	Sleep until ATA Status register bit BSY clears,
+ *	or a timeout occurs.
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+static int bfin_ata_busy_sleep(struct ata_port *ap,
+		       long tmout_pat, unsigned long tmout)
+{
+	u8 status;
+
+	status = bfin_ata_busy_wait(ap, ATA_BUSY, 300, 0);
+	while (status != 0xff && (status & ATA_BUSY) && tmout_pat > 0) {
+		msleep(50);
+		tmout_pat -= 50;
+		status = bfin_ata_busy_wait(ap, ATA_BUSY, 3, 0);
+	}
+
+	if (status != 0xff && (status & ATA_BUSY))
+		printf("port is slow to respond, please be patient "
+				"(Status 0x%x)\n", status);
+
+	while (status != 0xff && (status & ATA_BUSY) && tmout_pat > 0) {
+		msleep(50);
+		tmout_pat -= 50;
+		status = bfin_check_status(ap);
+	}
+
+	if (status == 0xff)
+		return -ENODEV;
+
+	if (status & ATA_BUSY) {
+		printf("port failed to respond "
+				"(%lu secs, Status 0x%x)\n",
+				DIV_ROUND_UP(tmout, 1000), status);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+/**
+ *	bfin_dev_select - Select device 0/1 on ATA bus
+ *	@ap: ATA channel to manipulate
+ *	@device: ATA device (numbered from zero) to select
+ *
+ *	Note: Original code is ata_sff_dev_select().
+ */
+
+static void bfin_dev_select(struct ata_port *ap, unsigned int device)
+{
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+	u8 tmp;
+
+
+	if (device == 0)
+		tmp = ATA_DEVICE_OBS;
+	else
+		tmp = ATA_DEVICE_OBS | ATA_DEV1;
+
+	write_atapi_register(base, ATA_REG_DEVICE, tmp);
+	udelay(1);
+}
+
+/**
+ *	bfin_devchk - PATA device presence detection
+ *	@ap: ATA channel to examine
+ *	@device: Device to examine (starting at zero)
+ *
+ *	Note: Original code is ata_devchk().
+ */
+
+static unsigned int bfin_devchk(struct ata_port *ap,
+				unsigned int device)
+{
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+	u8 nsect, lbal;
+
+	bfin_dev_select(ap, device);
+
+	write_atapi_register(base, ATA_REG_NSECT, 0x55);
+	write_atapi_register(base, ATA_REG_LBAL, 0xaa);
+
+	write_atapi_register(base, ATA_REG_NSECT, 0xaa);
+	write_atapi_register(base, ATA_REG_LBAL, 0x55);
+
+	write_atapi_register(base, ATA_REG_NSECT, 0x55);
+	write_atapi_register(base, ATA_REG_LBAL, 0xaa);
+
+	nsect = read_atapi_register(base, ATA_REG_NSECT);
+	lbal = read_atapi_register(base, ATA_REG_LBAL);
+
+	if ((nsect == 0x55) && (lbal == 0xaa))
+		return 1;	/* we found a device */
+
+	return 0;		/* nothing found */
+}
+
+/**
+ *	bfin_bus_post_reset - PATA device post reset
+ *
+ *	Note: Original code is ata_bus_post_reset().
+ */
+
+static void bfin_bus_post_reset(struct ata_port *ap, unsigned int devmask)
+{
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+	unsigned int dev0 = devmask & (1 << 0);
+	unsigned int dev1 = devmask & (1 << 1);
+	long deadline;
+
+	/* if device 0 was found in ata_devchk, wait for its
+	 * BSY bit to clear
+	 */
+	if (dev0)
+		bfin_ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
+
+	/* if device 1 was found in ata_devchk, wait for
+	 * register access, then wait for BSY to clear
+	 */
+	deadline = ATA_TMOUT_BOOT;
+	while (dev1) {
+		u8 nsect, lbal;
+
+		bfin_dev_select(ap, 1);
+		nsect = read_atapi_register(base, ATA_REG_NSECT);
+		lbal = read_atapi_register(base, ATA_REG_LBAL);
+		if ((nsect == 1) && (lbal == 1))
+			break;
+		if (deadline <= 0) {
+			dev1 = 0;
+			break;
+		}
+		msleep(50);	/* give drive a breather */
+		deadline -= 50;
+	}
+	if (dev1)
+		bfin_ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
+
+	/* is all this really necessary? */
+	bfin_dev_select(ap, 0);
+	if (dev1)
+		bfin_dev_select(ap, 1);
+	if (dev0)
+		bfin_dev_select(ap, 0);
+}
+
+/**
+ *	bfin_bus_softreset - PATA device software reset
+ *
+ *	Note: Original code is ata_bus_softreset().
+ */
+
+static unsigned int bfin_bus_softreset(struct ata_port *ap,
+				       unsigned int devmask)
+{
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+
+	/* software reset.  causes dev0 to be selected */
+	write_atapi_register(base, ATA_REG_CTRL, ap->ctl_reg);
+	udelay(20);
+	write_atapi_register(base, ATA_REG_CTRL, ap->ctl_reg | ATA_SRST);
+	udelay(20);
+	write_atapi_register(base, ATA_REG_CTRL, ap->ctl_reg);
+
+	/* spec mandates ">= 2ms" before checking status.
+	 * We wait 150ms, because that was the magic delay used for
+	 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
+	 * between when the ATA command register is written, and then
+	 * status is checked.  Because waiting for "a while" before
+	 * checking status is fine, post SRST, we perform this magic
+	 * delay here as well.
+	 *
+	 * Old drivers/ide uses the 2mS rule and then waits for ready
+	 */
+	msleep(150);
+
+	/* Before we perform post reset processing we want to see if
+	 * the bus shows 0xFF because the odd clown forgets the D7
+	 * pulldown resistor.
+	 */
+	if (bfin_check_status(ap) == 0xFF)
+		return 0;
+
+	bfin_bus_post_reset(ap, devmask);
+
+	return 0;
+}
+
+/**
+ *	bfin_softreset - reset host port via ATA SRST
+ *	@ap: port to reset
+ *
+ *	Note: Original code is ata_sff_softreset().
+ */
+
+static int bfin_softreset(struct ata_port *ap)
+{
+	unsigned int err_mask;
+
+	ap->dev_mask = 0;
+
+	/* determine if device 0/1 are present.
+	 * only one device is supported on one port by now.
+	*/
+	if (bfin_devchk(ap, 0))
+		ap->dev_mask |= (1 << 0);
+	else if (bfin_devchk(ap, 1))
+		ap->dev_mask |= (1 << 1);
+	else
+		return -ENODEV;
+
+	/* select device 0 again */
+	bfin_dev_select(ap, 0);
+
+	/* issue bus reset */
+	err_mask = bfin_bus_softreset(ap, ap->dev_mask);
+	if (err_mask) {
+		printf("SRST failed (err_mask=0x%x)\n",
+				err_mask);
+		ap->dev_mask = 0;
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/**
+ *	bfin_irq_clear - Clear ATAPI interrupt.
+ *	@ap: Port associated with this ATA transaction.
+ *
+ *	Note: Original code is ata_sff_irq_clear().
+ */
+
+static void bfin_irq_clear(struct ata_port *ap)
+{
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+
+	ATAPI_SET_INT_STATUS(base, ATAPI_GET_INT_STATUS(base)|ATAPI_DEV_INT
+		| MULTI_DONE_INT | UDMAIN_DONE_INT | UDMAOUT_DONE_INT
+		| MULTI_TERM_INT | UDMAIN_TERM_INT | UDMAOUT_TERM_INT);
+}
+
+static u8 bfin_wait_for_irq(struct ata_port *ap, unsigned int max)
+{
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+
+	do {
+		if (ATAPI_GET_INT_STATUS(base) & (ATAPI_DEV_INT
+		| MULTI_DONE_INT | UDMAIN_DONE_INT | UDMAOUT_DONE_INT
+		| MULTI_TERM_INT | UDMAIN_TERM_INT | UDMAOUT_TERM_INT)) {
+			break;
+		}
+		udelay(1000);
+		max--;
+	} while ((max > 0));
+
+	return max == 0;
+}
+
+/**
+ *	bfin_ata_reset_port - initialize BFIN ATAPI port.
+ */
+
+static int bfin_ata_reset_port(struct ata_port *ap)
+{
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+	int count;
+	unsigned short status;
+
+	/* Disable all ATAPI interrupts */
+	ATAPI_SET_INT_MASK(base, 0);
+	SSYNC();
+
+	/* Assert the RESET signal 25us*/
+	ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base) | DEV_RST);
+	udelay(30);
+
+	/* Negate the RESET signal for 2ms*/
+	ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base) & ~DEV_RST);
+	msleep(2);
+
+	/* Wait on Busy flag to clear */
+	count = 10000000;
+	do {
+		status = read_atapi_register(base, ATA_REG_STATUS);
+	} while (--count && (status & ATA_BUSY));
+
+	/* Enable only ATAPI Device interrupt */
+	ATAPI_SET_INT_MASK(base, 1);
+	SSYNC();
+
+	return !count;
+}
+
+/**
+ *
+ *	Function:       bfin_config_atapi_gpio
+ *
+ *	Description:    Configures the ATAPI pins for use
+ *
+ */
+static int bfin_config_atapi_gpio(struct ata_port *ap)
+{
+	bfin_write_PORTH_FER(bfin_read_PORTH_FER() | 0x4);
+	bfin_write_PORTH_MUX(bfin_read_PORTH_MUX() & ~0x30);
+	bfin_write_PORTH_DIR_SET(0x4);
+
+	bfin_write_PORTJ_FER(0x7f8);
+	bfin_write_PORTJ_MUX(bfin_read_PORTI_MUX() & ~0x3fffc0);
+	bfin_write_PORTJ_DIR_SET(0x5f8);
+	bfin_write_PORTJ_DIR_CLEAR(0x200);
+	bfin_write_PORTJ_INEN(0x200);
+
+	bfin_write_PINT2_ASSIGN(0x0707);
+	bfin_write_PINT2_MASK_SET(0x200);
+	SSYNC();
+
+	return 0;
+}
+
+/**
+ *	bfin_atapi_probe	-	attach a bfin atapi interface
+ *	@pdev: platform device
+ *
+ *	Register a bfin atapi interface.
+ *
+ *
+ *	Platform devices are expected to contain 2 resources per port:
+ *
+ *		- I/O Base (IORESOURCE_IO)
+ *		- IRQ	   (IORESOURCE_IRQ)
+ *
+ */
+static int bfin_ata_probe_port(struct ata_port *ap)
+{
+	if (bfin_config_atapi_gpio(ap)) {
+		printf("Requesting Peripherals faild\n");
+		return -EFAULT;
+	}
+
+	if (bfin_ata_reset_port(ap)) {
+		printf("Fail to reset ATAPI device\n");
+		return -EFAULT;
+	}
+
+	if (ap->ata_mode >= XFER_PIO_0 && ap->ata_mode <= XFER_PIO_4)
+		bfin_set_piomode(ap, ap->ata_mode);
+	else {
+		printf("Given ATA data transfer mode is not supported.\n");
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+#define ATA_SECTOR_WORDS (ATA_SECT_SIZE/2)
+
+static void bfin_ata_identify(struct ata_port *ap, int dev)
+{
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+	u8 status = 0;
+	static u16 iobuf[ATA_SECTOR_WORDS];
+	u64 n_sectors = 0;
+	hd_driveid_t *iop = (hd_driveid_t *)iobuf;
+
+	memset(iobuf, 0, sizeof(iobuf));
+
+	if (!(ap->dev_mask & (1 << dev)))
+		return;
+
+	debug("port=%d dev=%d\n", ap->port_no, dev);
+
+	bfin_dev_select(ap, dev);
+
+	status = 0;
+	/* Device Identify Command */
+	write_atapi_register(base, ATA_REG_CMD, ATA_CMD_ID_ATA);
+	bfin_check_altstatus(ap);
+	udelay(10);
+
+	status = bfin_ata_busy_wait(ap, ATA_BUSY, 1000, 0);
+	if (status & ATA_ERR) {
+		printf("\ndevice not responding\n");
+		ap->dev_mask &= ~(1 << dev);
+		return;
+	}
+
+	read_atapi_data(base, ATA_SECTOR_WORDS, iobuf);
+
+	ata_swap_buf_le16(iobuf, ATA_SECTOR_WORDS);
+
+	/* we require LBA and DMA support (bits 8 & 9 of word 49) */
+	if (!ata_id_has_dma(iobuf) || !ata_id_has_lba(iobuf))
+		printf("ata%u: no dma/lba\n", ap->port_no);
+
+#ifdef DEBUG
+	ata_dump_id(iobuf);
+#endif
+
+	n_sectors = ata_id_n_sectors(iobuf);
+
+	if (n_sectors == 0) {
+		ap->dev_mask &= ~(1 << dev);
+		return;
+	}
+
+	ata_id_c_string(iobuf, (unsigned char *)sata_dev_desc[ap->port_no].revision,
+			 ATA_ID_FW_REV, sizeof(sata_dev_desc[ap->port_no].revision));
+	ata_id_c_string(iobuf, (unsigned char *)sata_dev_desc[ap->port_no].vendor,
+			 ATA_ID_PROD, sizeof(sata_dev_desc[ap->port_no].vendor));
+	ata_id_c_string(iobuf, (unsigned char *)sata_dev_desc[ap->port_no].product,
+			 ATA_ID_SERNO, sizeof(sata_dev_desc[ap->port_no].product));
+
+	if ((iop->config & 0x0080) == 0x0080)
+		sata_dev_desc[ap->port_no].removable = 1;
+	else
+		sata_dev_desc[ap->port_no].removable = 0;
+
+	sata_dev_desc[ap->port_no].lba = (u32) n_sectors;
+	debug("lba=0x%x\n", sata_dev_desc[ap->port_no].lba);
+
+#ifdef CONFIG_LBA48
+	if (iop->command_set_2 & 0x0400)
+		sata_dev_desc[ap->port_no].lba48 = 1;
+	else
+		sata_dev_desc[ap->port_no].lba48 = 0;
+#endif
+
+	/* assuming HD */
+	sata_dev_desc[ap->port_no].type = DEV_TYPE_HARDDISK;
+	sata_dev_desc[ap->port_no].blksz = ATA_SECT_SIZE;
+	sata_dev_desc[ap->port_no].lun = 0;	/* just to fill something in... */
+
+	printf("PATA device#%d %s is found on ata port#%d.\n",
+		ap->port_no%PATA_DEV_NUM_PER_PORT,
+		sata_dev_desc[ap->port_no].vendor,
+		ap->port_no/PATA_DEV_NUM_PER_PORT);
+}
+
+static void bfin_ata_set_Feature_cmd(struct ata_port *ap, int dev)
+{
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+	u8 status = 0;
+
+	if (!(ap->dev_mask & (1 << dev)))
+		return;
+
+	bfin_dev_select(ap, dev);
+
+	write_atapi_register(base, ATA_REG_FEATURE, SETFEATURES_XFER);
+	write_atapi_register(base, ATA_REG_NSECT, ap->ata_mode);
+	write_atapi_register(base, ATA_REG_LBAL, 0);
+	write_atapi_register(base, ATA_REG_LBAM, 0);
+	write_atapi_register(base, ATA_REG_LBAH, 0);
+
+	write_atapi_register(base, ATA_REG_DEVICE, ATA_DEVICE_OBS);
+	write_atapi_register(base, ATA_REG_CMD, ATA_CMD_SET_FEATURES);
+
+	udelay(50);
+	msleep(150);
+
+	status = bfin_ata_busy_wait(ap, ATA_BUSY, 5000, 0);
+	if ((status & (ATA_BUSY | ATA_ERR))) {
+		printf("Error  : status 0x%02x\n", status);
+		ap->dev_mask &= ~(1 << dev);
+	}
+}
+
+int scan_sata(int dev)
+{
+	/* dev is the index of each ata device in the system. one PATA port
+	 * contains 2 devices. one element in scan_done array indicates one
+	 * PATA port. device connected to one PATA port is selected by
+	 * bfin_dev_select() before access.
+	 */
+	struct ata_port *ap = &port[dev];
+	static int scan_done[(CONFIG_SYS_SATA_MAX_DEVICE+1)/PATA_DEV_NUM_PER_PORT];
+
+	if (scan_done[dev/PATA_DEV_NUM_PER_PORT])
+		return 0;
+
+	/* Check for attached device */
+	if (!bfin_ata_probe_port(ap)) {
+		if (bfin_softreset(ap)) {
+			/* soft reset failed, try a hard one */
+			bfin_ata_reset_port(ap);
+			if (bfin_softreset(ap))
+				scan_done[dev/PATA_DEV_NUM_PER_PORT] = 1;
+		} else {
+			scan_done[dev/PATA_DEV_NUM_PER_PORT] = 1;
+		}
+	}
+	if (scan_done[dev/PATA_DEV_NUM_PER_PORT]) {
+		/* Probe device and set xfer mode */
+		bfin_ata_identify(ap, dev%PATA_DEV_NUM_PER_PORT);
+		bfin_ata_set_Feature_cmd(ap, dev%PATA_DEV_NUM_PER_PORT);
+		init_part(&sata_dev_desc[dev]);
+		return 0;
+	}
+
+	printf("PATA device#%d is not present on ATA port#%d.\n",
+		ap->port_no%PATA_DEV_NUM_PER_PORT,
+		ap->port_no/PATA_DEV_NUM_PER_PORT);
+
+	return -1;
+}
+
+int init_sata(int dev)
+{
+	struct ata_port *ap = &port[dev];
+	static u8 init_done;
+	int res = 1;
+
+	if (init_done)
+		return res;
+
+	init_done = 1;
+
+	switch (dev/PATA_DEV_NUM_PER_PORT) {
+	case 0:
+		ap->ioaddr.ctl_addr = ATAPI_CONTROL;
+		ap->ata_mode = CONFIG_BFIN_ATA_MODE;
+		break;
+	default:
+		printf("Tried to scan unknown port %d.\n", dev);
+		return res;
+	}
+
+	if (ap->ata_mode < XFER_PIO_0 || ap->ata_mode > XFER_PIO_4) {
+		ap->ata_mode = XFER_PIO_4;
+		printf("DMA mode is not supported. Set to PIO mode 4.\n");
+	}
+
+	ap->port_no = dev;
+	ap->ctl_reg = 0x8;	/*Default value of control reg */
+
+	res = 0;
+	return res;
+}
+
+/* Read up to 255 sectors
+ *
+ * Returns sectors read
+*/
+static u8 do_one_read(struct ata_port *ap, u64 blknr, u8 blkcnt, u16 *buffer,
+			uchar lba48)
+{
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+	u8 sr = 0;
+	u8 status;
+	u16 err = 0;
+
+	if (!(bfin_check_status(ap) & ATA_DRDY)) {
+		printf("Device ata%d not ready\n", ap->port_no);
+		return 0;
+	}
+
+	/* Set up transfer */
+#ifdef CONFIG_LBA48
+	if (lba48) {
+		/* write high bits */
+		write_atapi_register(base, ATA_REG_NSECT, 0);
+		write_atapi_register(base, ATA_REG_LBAL, (blknr >> 24) & 0xFF);
+		write_atapi_register(base, ATA_REG_LBAM, (blknr >> 32) & 0xFF);
+		write_atapi_register(base, ATA_REG_LBAH, (blknr >> 40) & 0xFF);
+	}
+#endif
+	write_atapi_register(base, ATA_REG_NSECT, blkcnt);
+	write_atapi_register(base, ATA_REG_LBAL, (blknr >> 0) & 0xFF);
+	write_atapi_register(base, ATA_REG_LBAM, (blknr >> 8) & 0xFF);
+	write_atapi_register(base, ATA_REG_LBAH, (blknr >> 16) & 0xFF);
+
+#ifdef CONFIG_LBA48
+	if (lba48) {
+		write_atapi_register(base, ATA_REG_DEVICE, ATA_LBA);
+		write_atapi_register(base, ATA_REG_CMD, ATA_CMD_PIO_READ_EXT);
+	} else
+#endif
+	{
+		write_atapi_register(base, ATA_REG_DEVICE, ATA_LBA | ((blknr >> 24) & 0xF));
+		write_atapi_register(base, ATA_REG_CMD, ATA_CMD_PIO_READ);
+	}
+	status = bfin_ata_busy_wait(ap, ATA_BUSY, 500000, 1);
+
+	if (status & (ATA_BUSY | ATA_ERR)) {
+		printf("Device %d not responding status 0x%x.\n", ap->port_no, status);
+		err = read_atapi_register(base, ATA_REG_ERR);
+		printf("Error reg = 0x%x\n", err);
+		return sr;
+	}
+
+	while (blkcnt--) {
+		if (bfin_wait_for_irq(ap, 500)) {
+			printf("ata%u irq failed\n", ap->port_no);
+			return sr;
+		}
+
+		status = bfin_check_status(ap);
+		if (status & ATA_ERR) {
+			err = read_atapi_register(base, ATA_REG_ERR);
+			printf("ata%u error %d\n", ap->port_no, err);
+			return sr;
+		}
+		bfin_irq_clear(ap);
+
+		/* Read one sector */
+		read_atapi_data(base, ATA_SECTOR_WORDS, buffer);
+		buffer += ATA_SECTOR_WORDS;
+		sr++;
+	}
+
+	return sr;
+}
+
+ulong sata_read(int dev, ulong block, ulong blkcnt, void *buff)
+{
+	struct ata_port *ap = &port[dev];
+	ulong n = 0, sread;
+	u16 *buffer = (u16 *) buff;
+	u8 status = 0;
+	u64 blknr = (u64) block;
+	unsigned char lba48 = 0;
+
+#ifdef CONFIG_LBA48
+	if (blknr > 0xfffffff) {
+		if (!sata_dev_desc[dev].lba48) {
+			printf("Drive doesn't support 48-bit addressing\n");
+			return 0;
+		}
+		/* more than 28 bits used, use 48bit mode */
+		lba48 = 1;
+	}
+#endif
+	bfin_dev_select(ap, dev%PATA_DEV_NUM_PER_PORT);
+
+	while (blkcnt > 0) {
+
+		if (blkcnt > 255)
+			sread = 255;
+		else
+			sread = blkcnt;
+
+		status = do_one_read(ap, blknr, sread, buffer, lba48);
+		if (status != sread) {
+			printf("Read failed\n");
+			return n;
+		}
+
+		blkcnt -= sread;
+		blknr += sread;
+		n += sread;
+		buffer += sread * ATA_SECTOR_WORDS;
+	}
+	return n;
+}
+
+ulong sata_write(int dev, ulong block, ulong blkcnt, const void *buff)
+{
+	struct ata_port *ap = &port[dev];
+	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+	ulong n = 0;
+	u16 *buffer = (u16 *) buff;
+	unsigned char status = 0;
+	u64 blknr = (u64) block;
+#ifdef CONFIG_LBA48
+	unsigned char lba48 = 0;
+
+	if (blknr > 0xfffffff) {
+		if (!sata_dev_desc[dev].lba48) {
+			printf("Drive doesn't support 48-bit addressing\n");
+			return 0;
+		}
+		/* more than 28 bits used, use 48bit mode */
+		lba48 = 1;
+	}
+#endif
+
+	bfin_dev_select(ap, dev%PATA_DEV_NUM_PER_PORT);
+
+	while (blkcnt-- > 0) {
+		status = bfin_ata_busy_wait(ap, ATA_BUSY, 50000, 0);
+		if (status & ATA_BUSY) {
+			printf("ata%u failed to respond\n", ap->port_no);
+			return n;
+		}
+#ifdef CONFIG_LBA48
+		if (lba48) {
+			/* write high bits */
+			write_atapi_register(base, ATA_REG_NSECT, 0);
+			write_atapi_register(base, ATA_REG_LBAL,
+				(blknr >> 24) & 0xFF);
+			write_atapi_register(base, ATA_REG_LBAM,
+				(blknr >> 32) & 0xFF);
+			write_atapi_register(base, ATA_REG_LBAH,
+				(blknr >> 40) & 0xFF);
+		}
+#endif
+		write_atapi_register(base, ATA_REG_NSECT, 1);
+		write_atapi_register(base, ATA_REG_LBAL, (blknr >> 0) & 0xFF);
+		write_atapi_register(base, ATA_REG_LBAM, (blknr >> 8) & 0xFF);
+		write_atapi_register(base, ATA_REG_LBAH, (blknr >> 16) & 0xFF);
+#ifdef CONFIG_LBA48
+		if (lba48) {
+			write_atapi_register(base, ATA_REG_DEVICE, ATA_LBA);
+			write_atapi_register(base, ATA_REG_CMD,
+				ATA_CMD_PIO_WRITE_EXT);
+		} else
+#endif
+		{
+			write_atapi_register(base, ATA_REG_DEVICE,
+				ATA_LBA | ((blknr >> 24) & 0xF));
+			write_atapi_register(base, ATA_REG_CMD,
+				ATA_CMD_PIO_WRITE);
+		}
+
+		/*may take up to 5 sec */
+		status = bfin_ata_busy_wait(ap, ATA_BUSY, 50000, 0);
+		if ((status & (ATA_DRQ | ATA_BUSY | ATA_ERR)) != ATA_DRQ) {
+			printf("Error no DRQ dev %d blk %ld: sts 0x%02x\n",
+				ap->port_no, (ulong) blknr, status);
+			return n;
+		}
+
+		write_atapi_data(base, ATA_SECTOR_WORDS, buffer);
+		bfin_check_altstatus(ap);
+		udelay(1);
+
+		++n;
+		++blknr;
+		buffer += ATA_SECTOR_WORDS;
+	}
+	return n;
+}