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linux/drivers/ata/pata_mpc52xx.c
Julia Lawall d01159dffa drivers/ata/pata_mpc52xx.c: clean up error handling code 
This patch makes a number of changes with respect to the error-handling
code:

* Remove cleanup calls for the devm functions in both the error handling
  code and the remove function.  This cleanup is done automatically.

* The previous change simplifies the cleanup code at the end of the
  function such that there is nothing to do on the failure of the call to
  devm_ioremap.  So it is changed to just return directly.

* There is no need for the ifs in the cleanup code at the end of the
  function, because in each case the cleanup needed is statically
  known.  Drop the ifs, add new err labels, and drop the initializations of
  the tested variables to NULL.

* Change the call to request_irq to a call to devm_request_irq, so that it
  is cleaned up on exit.

* Cause the return value of devm_request_irq to go into the returned
  variable rv rather than the unused variable ret.  Drop ret.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2012-03-13 16:41:08 -04:00

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/*
* 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 <sysdev/bestcomm/bestcomm.h>
#include <sysdev/bestcomm/bestcomm_priv.h>
#include <sysdev/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 __devinit
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);
}
static struct mpc52xx_ata_priv *
mpc52xx_ata_remove_one(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
struct mpc52xx_ata_priv *priv = host->private_data;
ata_host_detach(host);
return priv;
}
/* ======================================================================== */
/* OF Platform driver */
/* ======================================================================== */
static int __devinit
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 mpc52xx_ata_priv *priv;
int task_irq;
/* Deregister the ATA interface */
priv = mpc52xx_ata_remove_one(&op->dev);
/* 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
static int
mpc52xx_ata_suspend(struct platform_device *op, pm_message_t state)
{
struct ata_host *host = dev_get_drvdata(&op->dev);
return ata_host_suspend(host, state);
}
static int
mpc52xx_ata_resume(struct platform_device *op)
{
struct ata_host *host = dev_get_drvdata(&op->dev);
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
.suspend = mpc52xx_ata_suspend,
.resume = mpc52xx_ata_resume,
#endif
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
.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);
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