Initial import

1 files changed, 876 insertions, 0 deletions

diff --git a/drivers/ata/pata_mpc52xx.c b/drivers/ata/pata_mpc52xx.c
new file mode 100644
index 000000000..252ba27fa
--- /dev/null
+++ b/drivers/ata/pata_mpc52xx.c
@@ -0,0 +1,876 @@
+/*
+ * drivers/ata/pata_mpc52xx.c
+ *
+ * libata driver for the Freescale MPC52xx on-chip IDE interface
+ *
+ * Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
+ * Copyright (C) 2003 Mipsys - Benjamin Herrenschmidt
+ *
+ * UDMA support based on patches by Freescale (Bernard Kuhn, John Rigby),
+ * Domen Puncer and Tim Yamin.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/gfp.h>
+#include <linux/delay.h>
+#include <linux/libata.h>
+#include <linux/of_platform.h>
+#include <linux/types.h>
+
+#include <asm/cacheflush.h>
+#include <asm/prom.h>
+#include <asm/mpc52xx.h>
+
+#include <linux/fsl/bestcomm/bestcomm.h>
+#include <linux/fsl/bestcomm/bestcomm_priv.h>
+#include <linux/fsl/bestcomm/ata.h>
+
+#define DRV_NAME	"mpc52xx_ata"
+
+/* Private structures used by the driver */
+struct mpc52xx_ata_timings {
+	u32	pio1;
+	u32	pio2;
+	u32	mdma1;
+	u32	mdma2;
+	u32	udma1;
+	u32	udma2;
+	u32	udma3;
+	u32	udma4;
+	u32	udma5;
+	int	using_udma;
+};
+
+struct mpc52xx_ata_priv {
+	unsigned int			ipb_period;
+	struct mpc52xx_ata __iomem	*ata_regs;
+	phys_addr_t			ata_regs_pa;
+	int				ata_irq;
+	struct mpc52xx_ata_timings	timings[2];
+	int				csel;
+
+	/* DMA */
+	struct bcom_task		*dmatsk;
+	const struct udmaspec		*udmaspec;
+	const struct mdmaspec		*mdmaspec;
+	int 				mpc52xx_ata_dma_last_write;
+	int				waiting_for_dma;
+};
+
+
+/* ATAPI-4 PIO specs (in ns) */
+static const u16 ataspec_t0[5]		= {600, 383, 240, 180, 120};
+static const u16 ataspec_t1[5]		= { 70,  50,  30,  30,  25};
+static const u16 ataspec_t2_8[5]	= {290, 290, 290,  80,  70};
+static const u16 ataspec_t2_16[5]	= {165, 125, 100,  80,  70};
+static const u16 ataspec_t2i[5]		= {  0,   0,   0,  70,  25};
+static const u16 ataspec_t4[5]		= { 30,  20,  15,  10,  10};
+static const u16 ataspec_ta[5]		= { 35,  35,  35,  35,  35};
+
+#define CALC_CLKCYC(c,v) ((((v)+(c)-1)/(c)))
+
+/* ======================================================================== */
+
+/* ATAPI-4 MDMA specs (in clocks) */
+struct mdmaspec {
+	u8 t0M;
+	u8 td;
+	u8 th;
+	u8 tj;
+	u8 tkw;
+	u8 tm;
+	u8 tn;
+};
+
+static const struct mdmaspec mdmaspec66[3] = {
+	{ .t0M = 32, .td = 15, .th = 2, .tj = 2, .tkw = 15, .tm = 4, .tn = 1 },
+	{ .t0M = 10, .td = 6,  .th = 1, .tj = 1, .tkw = 4,  .tm = 2, .tn = 1 },
+	{ .t0M = 8,  .td = 5,  .th = 1, .tj = 1, .tkw = 2,  .tm = 2, .tn = 1 },
+};
+
+static const struct mdmaspec mdmaspec132[3] = {
+	{ .t0M = 64, .td = 29, .th = 3, .tj = 3, .tkw = 29, .tm = 7, .tn = 2 },
+	{ .t0M = 20, .td = 11, .th = 2, .tj = 1, .tkw = 7,  .tm = 4, .tn = 1 },
+	{ .t0M = 16, .td = 10, .th = 2, .tj = 1, .tkw = 4,  .tm = 4, .tn = 1 },
+};
+
+/* ATAPI-4 UDMA specs (in clocks) */
+struct udmaspec {
+	u8 tcyc;
+	u8 t2cyc;
+	u8 tds;
+	u8 tdh;
+	u8 tdvs;
+	u8 tdvh;
+	u8 tfs;
+	u8 tli;
+	u8 tmli;
+	u8 taz;
+	u8 tzah;
+	u8 tenv;
+	u8 tsr;
+	u8 trfs;
+	u8 trp;
+	u8 tack;
+	u8 tss;
+};
+
+static const struct udmaspec udmaspec66[6] = {
+	{ .tcyc = 8,  .t2cyc = 16, .tds  = 1,  .tdh  = 1, .tdvs = 5,  .tdvh = 1,
+	  .tfs  = 16, .tli   = 10, .tmli = 2,  .taz  = 1, .tzah = 2,  .tenv = 2,
+	  .tsr  = 3,  .trfs  = 5,  .trp  = 11, .tack = 2, .tss  = 4,
+	},
+	{ .tcyc = 5,  .t2cyc = 11, .tds  = 1,  .tdh  = 1, .tdvs = 4,  .tdvh = 1,
+	  .tfs  = 14, .tli   = 10, .tmli = 2,  .taz  = 1, .tzah = 2,  .tenv = 2,
+	  .tsr  = 2,  .trfs  = 5,  .trp  = 9,  .tack = 2, .tss  = 4,
+	},
+	{ .tcyc = 4,  .t2cyc = 8,  .tds  = 1,  .tdh  = 1, .tdvs = 3,  .tdvh = 1,
+	  .tfs  = 12, .tli   = 10, .tmli = 2,  .taz  = 1, .tzah = 2,  .tenv = 2,
+	  .tsr  = 2,  .trfs  = 4,  .trp  = 7,  .tack = 2, .tss  = 4,
+	},
+	{ .tcyc = 3,  .t2cyc = 6,  .tds  = 1,  .tdh  = 1, .tdvs = 2,  .tdvh = 1,
+	  .tfs  = 9,  .tli   = 7,  .tmli = 2,  .taz  = 1, .tzah = 2,  .tenv = 2,
+	  .tsr  = 2,  .trfs  = 4,  .trp  = 7,  .tack = 2, .tss  = 4,
+	},
+	{ .tcyc = 2,  .t2cyc = 4,  .tds  = 1,  .tdh  = 1, .tdvs = 1,  .tdvh = 1,
+	  .tfs  = 8,  .tli   = 8,  .tmli = 2,  .taz  = 1, .tzah = 2,  .tenv = 2,
+	  .tsr  = 2,  .trfs  = 4,  .trp  = 7,  .tack = 2, .tss  = 4,
+	},
+	{ .tcyc = 2,  .t2cyc = 2,  .tds  = 1,  .tdh  = 1, .tdvs = 1,  .tdvh = 1,
+	  .tfs  = 6,  .tli   = 5,  .tmli = 2,  .taz  = 1, .tzah = 2,  .tenv = 2,
+	  .tsr  = 2,  .trfs  = 4,  .trp  = 6,  .tack = 2, .tss  = 4,
+	},
+};
+
+static const struct udmaspec udmaspec132[6] = {
+	{ .tcyc = 15, .t2cyc = 31, .tds  = 2,  .tdh  = 1, .tdvs = 10, .tdvh = 1,
+	  .tfs  = 30, .tli   = 20, .tmli = 3,  .taz  = 2, .tzah = 3,  .tenv = 3,
+	  .tsr  = 7,  .trfs  = 10, .trp  = 22, .tack = 3, .tss  = 7,
+	},
+	{ .tcyc = 10, .t2cyc = 21, .tds  = 2,  .tdh  = 1, .tdvs = 7,  .tdvh = 1,
+	  .tfs  = 27, .tli   = 20, .tmli = 3,  .taz  = 2, .tzah = 3,  .tenv = 3,
+	  .tsr  = 4,  .trfs  = 10, .trp  = 17, .tack = 3, .tss  = 7,
+	},
+	{ .tcyc = 6,  .t2cyc = 12, .tds  = 1,  .tdh  = 1, .tdvs = 5,  .tdvh = 1,
+	  .tfs  = 23, .tli   = 20, .tmli = 3,  .taz  = 2, .tzah = 3,  .tenv = 3,
+	  .tsr  = 3,  .trfs  = 8,  .trp  = 14, .tack = 3, .tss  = 7,
+	},
+	{ .tcyc = 7,  .t2cyc = 12, .tds  = 1,  .tdh  = 1, .tdvs = 3,  .tdvh = 1,
+	  .tfs  = 15, .tli   = 13, .tmli = 3,  .taz  = 2, .tzah = 3,  .tenv = 3,
+	  .tsr  = 3,  .trfs  = 8,  .trp  = 14, .tack = 3, .tss  = 7,
+	},
+	{ .tcyc = 2,  .t2cyc = 5,  .tds  = 0,  .tdh  = 0, .tdvs = 1,  .tdvh = 1,
+	  .tfs  = 16, .tli   = 14, .tmli = 2,  .taz  = 1, .tzah = 2,  .tenv = 2,
+	  .tsr  = 2,  .trfs  = 7,  .trp  = 13, .tack = 2, .tss  = 6,
+	},
+	{ .tcyc = 3,  .t2cyc = 6,  .tds  = 1,  .tdh  = 1, .tdvs = 1,  .tdvh = 1,
+	  .tfs  = 12, .tli   = 10, .tmli = 3,  .taz  = 2, .tzah = 3,  .tenv = 3,
+	  .tsr  = 3,  .trfs  = 7,  .trp  = 12, .tack = 3, .tss  = 7,
+	},
+};
+
+/* ======================================================================== */
+
+/* Bit definitions inside the registers */
+#define MPC52xx_ATA_HOSTCONF_SMR	0x80000000UL /* State machine reset */
+#define MPC52xx_ATA_HOSTCONF_FR		0x40000000UL /* FIFO Reset */
+#define MPC52xx_ATA_HOSTCONF_IE		0x02000000UL /* Enable interrupt in PIO */
+#define MPC52xx_ATA_HOSTCONF_IORDY	0x01000000UL /* Drive supports IORDY protocol */
+
+#define MPC52xx_ATA_HOSTSTAT_TIP	0x80000000UL /* Transaction in progress */
+#define MPC52xx_ATA_HOSTSTAT_UREP	0x40000000UL /* UDMA Read Extended Pause */
+#define MPC52xx_ATA_HOSTSTAT_RERR	0x02000000UL /* Read Error */
+#define MPC52xx_ATA_HOSTSTAT_WERR	0x01000000UL /* Write Error */
+
+#define MPC52xx_ATA_FIFOSTAT_EMPTY	0x01 /* FIFO Empty */
+#define MPC52xx_ATA_FIFOSTAT_ERROR	0x40 /* FIFO Error */
+
+#define MPC52xx_ATA_DMAMODE_WRITE	0x01 /* Write DMA */
+#define MPC52xx_ATA_DMAMODE_READ	0x02 /* Read DMA */
+#define MPC52xx_ATA_DMAMODE_UDMA	0x04 /* UDMA enabled */
+#define MPC52xx_ATA_DMAMODE_IE		0x08 /* Enable drive interrupt to CPU in DMA mode */
+#define MPC52xx_ATA_DMAMODE_FE		0x10 /* FIFO Flush enable in Rx mode */
+#define MPC52xx_ATA_DMAMODE_FR		0x20 /* FIFO Reset */
+#define MPC52xx_ATA_DMAMODE_HUT		0x40 /* Host UDMA burst terminate */
+
+#define MAX_DMA_BUFFERS 128
+#define MAX_DMA_BUFFER_SIZE 0x20000u
+
+/* Structure of the hardware registers */
+struct mpc52xx_ata {
+
+	/* Host interface registers */
+	u32 config;		/* ATA + 0x00 Host configuration */
+	u32 host_status;	/* ATA + 0x04 Host controller status */
+	u32 pio1;		/* ATA + 0x08 PIO Timing 1 */
+	u32 pio2;		/* ATA + 0x0c PIO Timing 2 */
+	u32 mdma1;		/* ATA + 0x10 MDMA Timing 1 */
+	u32 mdma2;		/* ATA + 0x14 MDMA Timing 2 */
+	u32 udma1;		/* ATA + 0x18 UDMA Timing 1 */
+	u32 udma2;		/* ATA + 0x1c UDMA Timing 2 */
+	u32 udma3;		/* ATA + 0x20 UDMA Timing 3 */
+	u32 udma4;		/* ATA + 0x24 UDMA Timing 4 */
+	u32 udma5;		/* ATA + 0x28 UDMA Timing 5 */
+	u32 share_cnt;		/* ATA + 0x2c ATA share counter */
+	u32 reserved0[3];
+
+	/* FIFO registers */
+	u32 fifo_data;		/* ATA + 0x3c */
+	u8  fifo_status_frame;	/* ATA + 0x40 */
+	u8  fifo_status;	/* ATA + 0x41 */
+	u16 reserved7[1];
+	u8  fifo_control;	/* ATA + 0x44 */
+	u8  reserved8[5];
+	u16 fifo_alarm;		/* ATA + 0x4a */
+	u16 reserved9;
+	u16 fifo_rdp;		/* ATA + 0x4e */
+	u16 reserved10;
+	u16 fifo_wrp;		/* ATA + 0x52 */
+	u16 reserved11;
+	u16 fifo_lfrdp;		/* ATA + 0x56 */
+	u16 reserved12;
+	u16 fifo_lfwrp;		/* ATA + 0x5a */
+
+	/* Drive TaskFile registers */
+	u8  tf_control;		/* ATA + 0x5c TASKFILE Control/Alt Status */
+	u8  reserved13[3];
+	u16 tf_data;		/* ATA + 0x60 TASKFILE Data */
+	u16 reserved14;
+	u8  tf_features;	/* ATA + 0x64 TASKFILE Features/Error */
+	u8  reserved15[3];
+	u8  tf_sec_count;	/* ATA + 0x68 TASKFILE Sector Count */
+	u8  reserved16[3];
+	u8  tf_sec_num;		/* ATA + 0x6c TASKFILE Sector Number */
+	u8  reserved17[3];
+	u8  tf_cyl_low;		/* ATA + 0x70 TASKFILE Cylinder Low */
+	u8  reserved18[3];
+	u8  tf_cyl_high;	/* ATA + 0x74 TASKFILE Cylinder High */
+	u8  reserved19[3];
+	u8  tf_dev_head;	/* ATA + 0x78 TASKFILE Device/Head */
+	u8  reserved20[3];
+	u8  tf_command;		/* ATA + 0x7c TASKFILE Command/Status */
+	u8  dma_mode;		/* ATA + 0x7d ATA Host DMA Mode configuration */
+	u8  reserved21[2];
+};
+
+
+/* ======================================================================== */
+/* Aux fns                                                                  */
+/* ======================================================================== */
+
+
+/* MPC52xx low level hw control */
+static int
+mpc52xx_ata_compute_pio_timings(struct mpc52xx_ata_priv *priv, int dev, int pio)
+{
+	struct mpc52xx_ata_timings *timing = &priv->timings[dev];
+	unsigned int ipb_period = priv->ipb_period;
+	u32 t0, t1, t2_8, t2_16, t2i, t4, ta;
+
+	if ((pio < 0) || (pio > 4))
+		return -EINVAL;
+
+	t0	= CALC_CLKCYC(ipb_period, 1000 * ataspec_t0[pio]);
+	t1	= CALC_CLKCYC(ipb_period, 1000 * ataspec_t1[pio]);
+	t2_8	= CALC_CLKCYC(ipb_period, 1000 * ataspec_t2_8[pio]);
+	t2_16	= CALC_CLKCYC(ipb_period, 1000 * ataspec_t2_16[pio]);
+	t2i	= CALC_CLKCYC(ipb_period, 1000 * ataspec_t2i[pio]);
+	t4	= CALC_CLKCYC(ipb_period, 1000 * ataspec_t4[pio]);
+	ta	= CALC_CLKCYC(ipb_period, 1000 * ataspec_ta[pio]);
+
+	timing->pio1 = (t0 << 24) | (t2_8 << 16) | (t2_16 << 8) | (t2i);
+	timing->pio2 = (t4 << 24) | (t1 << 16) | (ta << 8);
+
+	return 0;
+}
+
+static int
+mpc52xx_ata_compute_mdma_timings(struct mpc52xx_ata_priv *priv, int dev,
+				 int speed)
+{
+	struct mpc52xx_ata_timings *t = &priv->timings[dev];
+	const struct mdmaspec *s = &priv->mdmaspec[speed];
+
+	if (speed < 0 || speed > 2)
+		return -EINVAL;
+
+	t->mdma1 = ((u32)s->t0M << 24) | ((u32)s->td << 16) | ((u32)s->tkw << 8) | s->tm;
+	t->mdma2 = ((u32)s->th << 24) | ((u32)s->tj << 16) | ((u32)s->tn << 8);
+	t->using_udma = 0;
+
+	return 0;
+}
+
+static int
+mpc52xx_ata_compute_udma_timings(struct mpc52xx_ata_priv *priv, int dev,
+				 int speed)
+{
+	struct mpc52xx_ata_timings *t = &priv->timings[dev];
+	const struct udmaspec *s = &priv->udmaspec[speed];
+
+	if (speed < 0 || speed > 2)
+		return -EINVAL;
+
+	t->udma1 = ((u32)s->t2cyc << 24) | ((u32)s->tcyc << 16) | ((u32)s->tds << 8) | s->tdh;
+	t->udma2 = ((u32)s->tdvs << 24) | ((u32)s->tdvh << 16) | ((u32)s->tfs << 8) | s->tli;
+	t->udma3 = ((u32)s->tmli << 24) | ((u32)s->taz << 16) | ((u32)s->tenv << 8) | s->tsr;
+	t->udma4 = ((u32)s->tss << 24) | ((u32)s->trfs << 16) | ((u32)s->trp << 8) | s->tack;
+	t->udma5 = (u32)s->tzah << 24;
+	t->using_udma = 1;
+
+	return 0;
+}
+
+static void
+mpc52xx_ata_apply_timings(struct mpc52xx_ata_priv *priv, int device)
+{
+	struct mpc52xx_ata __iomem *regs = priv->ata_regs;
+	struct mpc52xx_ata_timings *timing = &priv->timings[device];
+
+	out_be32(&regs->pio1,  timing->pio1);
+	out_be32(&regs->pio2,  timing->pio2);
+	out_be32(&regs->mdma1, timing->mdma1);
+	out_be32(&regs->mdma2, timing->mdma2);
+	out_be32(&regs->udma1, timing->udma1);
+	out_be32(&regs->udma2, timing->udma2);
+	out_be32(&regs->udma3, timing->udma3);
+	out_be32(&regs->udma4, timing->udma4);
+	out_be32(&regs->udma5, timing->udma5);
+	priv->csel = device;
+}
+
+static int
+mpc52xx_ata_hw_init(struct mpc52xx_ata_priv *priv)
+{
+	struct mpc52xx_ata __iomem *regs = priv->ata_regs;
+	int tslot;
+
+	/* Clear share_cnt (all sample code do this ...) */
+	out_be32(&regs->share_cnt, 0);
+
+	/* Configure and reset host */
+	out_be32(&regs->config,
+			MPC52xx_ATA_HOSTCONF_IE |
+			MPC52xx_ATA_HOSTCONF_IORDY |
+			MPC52xx_ATA_HOSTCONF_SMR |
+			MPC52xx_ATA_HOSTCONF_FR);
+
+	udelay(10);
+
+	out_be32(&regs->config,
+			MPC52xx_ATA_HOSTCONF_IE |
+			MPC52xx_ATA_HOSTCONF_IORDY);
+
+	/* Set the time slot to 1us */
+	tslot = CALC_CLKCYC(priv->ipb_period, 1000000);
+	out_be32(&regs->share_cnt, tslot << 16);
+
+	/* Init timings to PIO0 */
+	memset(priv->timings, 0x00, 2*sizeof(struct mpc52xx_ata_timings));
+
+	mpc52xx_ata_compute_pio_timings(priv, 0, 0);
+	mpc52xx_ata_compute_pio_timings(priv, 1, 0);
+
+	mpc52xx_ata_apply_timings(priv, 0);
+
+	return 0;
+}
+
+
+/* ======================================================================== */
+/* libata driver                                                            */
+/* ======================================================================== */
+
+static void
+mpc52xx_ata_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	struct mpc52xx_ata_priv *priv = ap->host->private_data;
+	int pio, rv;
+
+	pio = adev->pio_mode - XFER_PIO_0;
+
+	rv = mpc52xx_ata_compute_pio_timings(priv, adev->devno, pio);
+
+	if (rv) {
+		dev_err(ap->dev, "error: invalid PIO mode: %d\n", pio);
+		return;
+	}
+
+	mpc52xx_ata_apply_timings(priv, adev->devno);
+}
+
+static void
+mpc52xx_ata_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+	struct mpc52xx_ata_priv *priv = ap->host->private_data;
+	int rv;
+
+	if (adev->dma_mode >= XFER_UDMA_0) {
+		int dma = adev->dma_mode - XFER_UDMA_0;
+		rv = mpc52xx_ata_compute_udma_timings(priv, adev->devno, dma);
+	} else {
+		int dma = adev->dma_mode - XFER_MW_DMA_0;
+		rv = mpc52xx_ata_compute_mdma_timings(priv, adev->devno, dma);
+	}
+
+	if (rv) {
+		dev_alert(ap->dev,
+			"Trying to select invalid DMA mode %d\n",
+			adev->dma_mode);
+		return;
+	}
+
+	mpc52xx_ata_apply_timings(priv, adev->devno);
+}
+
+static void
+mpc52xx_ata_dev_select(struct ata_port *ap, unsigned int device)
+{
+	struct mpc52xx_ata_priv *priv = ap->host->private_data;
+
+	if (device != priv->csel)
+		mpc52xx_ata_apply_timings(priv, device);
+
+	ata_sff_dev_select(ap, device);
+}
+
+static int
+mpc52xx_ata_build_dmatable(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct mpc52xx_ata_priv *priv = ap->host->private_data;
+	struct bcom_ata_bd *bd;
+	unsigned int read = !(qc->tf.flags & ATA_TFLAG_WRITE), si;
+	struct scatterlist *sg;
+	int count = 0;
+
+	if (read)
+		bcom_ata_rx_prepare(priv->dmatsk);
+	else
+		bcom_ata_tx_prepare(priv->dmatsk);
+
+	for_each_sg(qc->sg, sg, qc->n_elem, si) {
+		dma_addr_t cur_addr = sg_dma_address(sg);
+		u32 cur_len = sg_dma_len(sg);
+
+		while (cur_len) {
+			unsigned int tc = min(cur_len, MAX_DMA_BUFFER_SIZE);
+			bd = (struct bcom_ata_bd *)
+				bcom_prepare_next_buffer(priv->dmatsk);
+
+			if (read) {
+				bd->status = tc;
+				bd->src_pa = (__force u32) priv->ata_regs_pa +
+					offsetof(struct mpc52xx_ata, fifo_data);
+				bd->dst_pa = (__force u32) cur_addr;
+			} else {
+				bd->status = tc;
+				bd->src_pa = (__force u32) cur_addr;
+				bd->dst_pa = (__force u32) priv->ata_regs_pa +
+					offsetof(struct mpc52xx_ata, fifo_data);
+			}
+
+			bcom_submit_next_buffer(priv->dmatsk, NULL);
+
+			cur_addr += tc;
+			cur_len -= tc;
+			count++;
+
+			if (count > MAX_DMA_BUFFERS) {
+				dev_alert(ap->dev, "dma table"
+					"too small\n");
+				goto use_pio_instead;
+			}
+		}
+	}
+	return 1;
+
+ use_pio_instead:
+	bcom_ata_reset_bd(priv->dmatsk);
+	return 0;
+}
+
+static void
+mpc52xx_bmdma_setup(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct mpc52xx_ata_priv *priv = ap->host->private_data;
+	struct mpc52xx_ata __iomem *regs = priv->ata_regs;
+
+	unsigned int read = !(qc->tf.flags & ATA_TFLAG_WRITE);
+	u8 dma_mode;
+
+	if (!mpc52xx_ata_build_dmatable(qc))
+		dev_alert(ap->dev, "%s: %i, return 1?\n",
+			__func__, __LINE__);
+
+	/* Check FIFO is OK... */
+	if (in_8(&priv->ata_regs->fifo_status) & MPC52xx_ATA_FIFOSTAT_ERROR)
+		dev_alert(ap->dev, "%s: FIFO error detected: 0x%02x!\n",
+			__func__, in_8(&priv->ata_regs->fifo_status));
+
+	if (read) {
+		dma_mode = MPC52xx_ATA_DMAMODE_IE | MPC52xx_ATA_DMAMODE_READ |
+				MPC52xx_ATA_DMAMODE_FE;
+
+		/* Setup FIFO if direction changed */
+		if (priv->mpc52xx_ata_dma_last_write != 0) {
+			priv->mpc52xx_ata_dma_last_write = 0;
+
+			/* Configure FIFO with granularity to 7 */
+			out_8(&regs->fifo_control, 7);
+			out_be16(&regs->fifo_alarm, 128);
+
+			/* Set FIFO Reset bit (FR) */
+			out_8(&regs->dma_mode, MPC52xx_ATA_DMAMODE_FR);
+		}
+	} else {
+		dma_mode = MPC52xx_ATA_DMAMODE_IE | MPC52xx_ATA_DMAMODE_WRITE;
+
+		/* Setup FIFO if direction changed */
+		if (priv->mpc52xx_ata_dma_last_write != 1) {
+			priv->mpc52xx_ata_dma_last_write = 1;
+
+			/* Configure FIFO with granularity to 4 */
+			out_8(&regs->fifo_control, 4);
+			out_be16(&regs->fifo_alarm, 128);
+		}
+	}
+
+	if (priv->timings[qc->dev->devno].using_udma)
+		dma_mode |= MPC52xx_ATA_DMAMODE_UDMA;
+
+	out_8(&regs->dma_mode, dma_mode);
+	priv->waiting_for_dma = ATA_DMA_ACTIVE;
+
+	ata_wait_idle(ap);
+	ap->ops->sff_exec_command(ap, &qc->tf);
+}
+
+static void
+mpc52xx_bmdma_start(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct mpc52xx_ata_priv *priv = ap->host->private_data;
+
+	bcom_set_task_auto_start(priv->dmatsk->tasknum, priv->dmatsk->tasknum);
+	bcom_enable(priv->dmatsk);
+}
+
+static void
+mpc52xx_bmdma_stop(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct mpc52xx_ata_priv *priv = ap->host->private_data;
+
+	bcom_disable(priv->dmatsk);
+	bcom_ata_reset_bd(priv->dmatsk);
+	priv->waiting_for_dma = 0;
+
+	/* Check FIFO is OK... */
+	if (in_8(&priv->ata_regs->fifo_status) & MPC52xx_ATA_FIFOSTAT_ERROR)
+		dev_alert(ap->dev, "%s: FIFO error detected: 0x%02x!\n",
+			__func__, in_8(&priv->ata_regs->fifo_status));
+}
+
+static u8
+mpc52xx_bmdma_status(struct ata_port *ap)
+{
+	struct mpc52xx_ata_priv *priv = ap->host->private_data;
+
+	/* Check FIFO is OK... */
+	if (in_8(&priv->ata_regs->fifo_status) & MPC52xx_ATA_FIFOSTAT_ERROR) {
+		dev_alert(ap->dev, "%s: FIFO error detected: 0x%02x!\n",
+			__func__, in_8(&priv->ata_regs->fifo_status));
+		return priv->waiting_for_dma | ATA_DMA_ERR;
+	}
+
+	return priv->waiting_for_dma;
+}
+
+static irqreturn_t
+mpc52xx_ata_task_irq(int irq, void *vpriv)
+{
+	struct mpc52xx_ata_priv *priv = vpriv;
+	while (bcom_buffer_done(priv->dmatsk))
+		bcom_retrieve_buffer(priv->dmatsk, NULL, NULL);
+
+	priv->waiting_for_dma |= ATA_DMA_INTR;
+
+	return IRQ_HANDLED;
+}
+
+static struct scsi_host_template mpc52xx_ata_sht = {
+	ATA_PIO_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations mpc52xx_ata_port_ops = {
+	.inherits		= &ata_bmdma_port_ops,
+	.sff_dev_select		= mpc52xx_ata_dev_select,
+	.set_piomode		= mpc52xx_ata_set_piomode,
+	.set_dmamode		= mpc52xx_ata_set_dmamode,
+	.bmdma_setup		= mpc52xx_bmdma_setup,
+	.bmdma_start		= mpc52xx_bmdma_start,
+	.bmdma_stop		= mpc52xx_bmdma_stop,
+	.bmdma_status		= mpc52xx_bmdma_status,
+	.qc_prep		= ata_noop_qc_prep,
+};
+
+static int mpc52xx_ata_init_one(struct device *dev,
+				struct mpc52xx_ata_priv *priv,
+				unsigned long raw_ata_regs,
+				int mwdma_mask, int udma_mask)
+{
+	struct ata_host *host;
+	struct ata_port *ap;
+	struct ata_ioports *aio;
+
+	host = ata_host_alloc(dev, 1);
+	if (!host)
+		return -ENOMEM;
+
+	ap = host->ports[0];
+	ap->flags		|= ATA_FLAG_SLAVE_POSS;
+	ap->pio_mask		= ATA_PIO4;
+	ap->mwdma_mask		= mwdma_mask;
+	ap->udma_mask		= udma_mask;
+	ap->ops			= &mpc52xx_ata_port_ops;
+	host->private_data	= priv;
+
+	aio = &ap->ioaddr;
+	aio->cmd_addr		= NULL;	/* Don't have a classic reg block */
+	aio->altstatus_addr	= &priv->ata_regs->tf_control;
+	aio->ctl_addr		= &priv->ata_regs->tf_control;
+	aio->data_addr		= &priv->ata_regs->tf_data;
+	aio->error_addr		= &priv->ata_regs->tf_features;
+	aio->feature_addr	= &priv->ata_regs->tf_features;
+	aio->nsect_addr		= &priv->ata_regs->tf_sec_count;
+	aio->lbal_addr		= &priv->ata_regs->tf_sec_num;
+	aio->lbam_addr		= &priv->ata_regs->tf_cyl_low;
+	aio->lbah_addr		= &priv->ata_regs->tf_cyl_high;
+	aio->device_addr	= &priv->ata_regs->tf_dev_head;
+	aio->status_addr	= &priv->ata_regs->tf_command;
+	aio->command_addr	= &priv->ata_regs->tf_command;
+
+	ata_port_desc(ap, "ata_regs 0x%lx", raw_ata_regs);
+
+	/* activate host */
+	return ata_host_activate(host, priv->ata_irq, ata_bmdma_interrupt, 0,
+				 &mpc52xx_ata_sht);
+}
+
+/* ======================================================================== */
+/* OF Platform driver                                                       */
+/* ======================================================================== */
+
+static int mpc52xx_ata_probe(struct platform_device *op)
+{
+	unsigned int ipb_freq;
+	struct resource res_mem;
+	int ata_irq = 0;
+	struct mpc52xx_ata __iomem *ata_regs;
+	struct mpc52xx_ata_priv *priv = NULL;
+	int rv, task_irq;
+	int mwdma_mask = 0, udma_mask = 0;
+	const __be32 *prop;
+	int proplen;
+	struct bcom_task *dmatsk;
+
+	/* Get ipb frequency */
+	ipb_freq = mpc5xxx_get_bus_frequency(op->dev.of_node);
+	if (!ipb_freq) {
+		dev_err(&op->dev, "could not determine IPB bus frequency\n");
+		return -ENODEV;
+	}
+
+	/* Get device base address from device tree, request the region
+	 * and ioremap it. */
+	rv = of_address_to_resource(op->dev.of_node, 0, &res_mem);
+	if (rv) {
+		dev_err(&op->dev, "could not determine device base address\n");
+		return rv;
+	}
+
+	if (!devm_request_mem_region(&op->dev, res_mem.start,
+				     sizeof(*ata_regs), DRV_NAME)) {
+		dev_err(&op->dev, "error requesting register region\n");
+		return -EBUSY;
+	}
+
+	ata_regs = devm_ioremap(&op->dev, res_mem.start, sizeof(*ata_regs));
+	if (!ata_regs) {
+		dev_err(&op->dev, "error mapping device registers\n");
+		return -ENOMEM;
+	}
+
+	/*
+	 * By default, all DMA modes are disabled for the MPC5200.  Some
+	 * boards don't have the required signals routed to make DMA work.
+	 * Also, the MPC5200B has a silicon bug that causes data corruption
+	 * with UDMA if it is used at the same time as the LocalPlus bus.
+	 *
+	 * Instead of trying to guess what modes are usable, check the
+	 * ATA device tree node to find out what DMA modes work on the board.
+	 * UDMA/MWDMA modes can also be forced by adding "libata.force=<mode>"
+	 * to the kernel boot parameters.
+	 *
+	 * The MPC5200 ATA controller supports MWDMA modes 0, 1 and 2 and
+	 * UDMA modes 0, 1 and 2.
+	 */
+	prop = of_get_property(op->dev.of_node, "mwdma-mode", &proplen);
+	if ((prop) && (proplen >= 4))
+		mwdma_mask = ATA_MWDMA2 & ((1 << (*prop + 1)) - 1);
+	prop = of_get_property(op->dev.of_node, "udma-mode", &proplen);
+	if ((prop) && (proplen >= 4))
+		udma_mask = ATA_UDMA2 & ((1 << (*prop + 1)) - 1);
+
+	ata_irq = irq_of_parse_and_map(op->dev.of_node, 0);
+	if (ata_irq == NO_IRQ) {
+		dev_err(&op->dev, "error mapping irq\n");
+		return -EINVAL;
+	}
+
+	/* Prepare our private structure */
+	priv = devm_kzalloc(&op->dev, sizeof(*priv), GFP_ATOMIC);
+	if (!priv) {
+		dev_err(&op->dev, "error allocating private structure\n");
+		rv = -ENOMEM;
+		goto err1;
+	}
+
+	priv->ipb_period = 1000000000 / (ipb_freq / 1000);
+	priv->ata_regs = ata_regs;
+	priv->ata_regs_pa = res_mem.start;
+	priv->ata_irq = ata_irq;
+	priv->csel = -1;
+	priv->mpc52xx_ata_dma_last_write = -1;
+
+	if (ipb_freq/1000000 == 66) {
+		priv->mdmaspec = mdmaspec66;
+		priv->udmaspec = udmaspec66;
+	} else {
+		priv->mdmaspec = mdmaspec132;
+		priv->udmaspec = udmaspec132;
+	}
+
+	/* Allocate a BestComm task for DMA */
+	dmatsk = bcom_ata_init(MAX_DMA_BUFFERS, MAX_DMA_BUFFER_SIZE);
+	if (!dmatsk) {
+		dev_err(&op->dev, "bestcomm initialization failed\n");
+		rv = -ENOMEM;
+		goto err1;
+	}
+
+	task_irq = bcom_get_task_irq(dmatsk);
+	rv = devm_request_irq(&op->dev, task_irq, &mpc52xx_ata_task_irq, 0,
+				"ATA task", priv);
+	if (rv) {
+		dev_err(&op->dev, "error requesting DMA IRQ\n");
+		goto err2;
+	}
+	priv->dmatsk = dmatsk;
+
+	/* Init the hw */
+	rv = mpc52xx_ata_hw_init(priv);
+	if (rv) {
+		dev_err(&op->dev, "error initializing hardware\n");
+		goto err2;
+	}
+
+	/* Register ourselves to libata */
+	rv = mpc52xx_ata_init_one(&op->dev, priv, res_mem.start,
+				  mwdma_mask, udma_mask);
+	if (rv) {
+		dev_err(&op->dev, "error registering with ATA layer\n");
+		goto err2;
+	}
+
+	return 0;
+
+ err2:
+	irq_dispose_mapping(task_irq);
+	bcom_ata_release(dmatsk);
+ err1:
+	irq_dispose_mapping(ata_irq);
+	return rv;
+}
+
+static int
+mpc52xx_ata_remove(struct platform_device *op)
+{
+	struct ata_host *host = platform_get_drvdata(op);
+	struct mpc52xx_ata_priv *priv = host->private_data;
+	int task_irq;
+
+	/* Deregister the ATA interface */
+	ata_platform_remove_one(op);
+
+	/* Clean up DMA */
+	task_irq = bcom_get_task_irq(priv->dmatsk);
+	irq_dispose_mapping(task_irq);
+	bcom_ata_release(priv->dmatsk);
+	irq_dispose_mapping(priv->ata_irq);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int
+mpc52xx_ata_suspend(struct platform_device *op, pm_message_t state)
+{
+	struct ata_host *host = platform_get_drvdata(op);
+
+	return ata_host_suspend(host, state);
+}
+
+static int
+mpc52xx_ata_resume(struct platform_device *op)
+{
+	struct ata_host *host = platform_get_drvdata(op);
+	struct mpc52xx_ata_priv *priv = host->private_data;
+	int rv;
+
+	rv = mpc52xx_ata_hw_init(priv);
+	if (rv) {
+		dev_err(host->dev, "error initializing hardware\n");
+		return rv;
+	}
+
+	ata_host_resume(host);
+
+	return 0;
+}
+#endif
+
+static struct of_device_id mpc52xx_ata_of_match[] = {
+	{ .compatible = "fsl,mpc5200-ata", },
+	{ .compatible = "mpc5200-ata", },
+	{},
+};
+
+
+static struct platform_driver mpc52xx_ata_of_platform_driver = {
+	.probe		= mpc52xx_ata_probe,
+	.remove		= mpc52xx_ata_remove,
+#ifdef CONFIG_PM_SLEEP
+	.suspend	= mpc52xx_ata_suspend,
+	.resume		= mpc52xx_ata_resume,
+#endif
+	.driver		= {
+		.name	= DRV_NAME,
+		.of_match_table = mpc52xx_ata_of_match,
+	},
+};
+
+module_platform_driver(mpc52xx_ata_of_platform_driver);
+
+MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
+MODULE_DESCRIPTION("Freescale MPC52xx IDE/ATA libata driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(of, mpc52xx_ata_of_match);
+