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linux/drivers/ata/pata_mpc52xx.c
Tejun Heo a1efdaba2d libata: make reset related methods proper port operations 
Currently reset methods are not specified directly in the
ata_port_operations table.  If a LLD wants to use custom reset
methods, it should construct and use a error_handler which uses those
reset methods.  It's done this way for two reasons.

First, the ops table already contained too many methods and adding
four more of them would noticeably increase the amount of necessary
boilerplate code all over low level drivers.

Second, as ->error_handler uses those reset methods, it can get
confusing.  ie. By overriding ->error_handler, those reset ops can be
made useless making layering a bit hazy.

Now that ops table uses inheritance, the first problem doesn't exist
anymore.  The second isn't completely solved but is relieved by
providing default values - most drivers can just override what it has
implemented and don't have to concern itself about higher level
callbacks.  In fact, there currently is no driver which actually
modifies error handling behavior.  Drivers which override
->error_handler just wraps the standard error handler only to prepare
the controller for EH.  I don't think making ops layering strict has
any noticeable benefit.

This patch makes ->prereset, ->softreset, ->hardreset, ->postreset and
their PMP counterparts propoer ops.  Default ops are provided in the
base ops tables and drivers are converted to override individual reset
methods instead of creating custom error_handler.

* ata_std_error_handler() doesn't use sata_std_hardreset() if SCRs
  aren't accessible.  sata_promise doesn't need to use separate
  error_handlers for PATA and SATA anymore.

* softreset is broken for sata_inic162x and sata_sx4.  As libata now
  always prefers hardreset, this doesn't really matter but the ops are
  forced to NULL using ATA_OP_NULL for documentation purpose.

* pata_hpt374 needs to use different prereset for the first and second
  PCI functions.  This used to be done by branching from
  hpt374_error_handler().  The proper way to do this is to use
  separate ops and port_info tables for each function.  Converted.

Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-04-17 15:44:18 -04:00

512 lines
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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
*
* 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/slab.h>
#include <linux/delay.h>
#include <linux/libata.h>
#include <asm/types.h>
#include <asm/prom.h>
#include <asm/of_platform.h>
#include <asm/mpc52xx.h>
#define DRV_NAME "mpc52xx_ata"
#define DRV_VERSION "0.1.2"
/* Private structures used by the driver */
struct mpc52xx_ata_timings {
u32 pio1;
u32 pio2;
};
struct mpc52xx_ata_priv {
unsigned int ipb_period;
struct mpc52xx_ata __iomem * ata_regs;
int ata_irq;
struct mpc52xx_ata_timings timings[2];
int csel;
};
/* ATAPI-4 PIO specs (in ns) */
static const int ataspec_t0[5] = {600, 383, 240, 180, 120};
static const int ataspec_t1[5] = { 70, 50, 30, 30, 25};
static const int ataspec_t2_8[5] = {290, 290, 290, 80, 70};
static const int ataspec_t2_16[5] = {165, 125, 100, 80, 70};
static const int ataspec_t2i[5] = { 0, 0, 0, 70, 25};
static const int ataspec_t4[5] = { 30, 20, 15, 10, 10};
static const int ataspec_ta[5] = { 35, 35, 35, 35, 35};
#define CALC_CLKCYC(c,v) ((((v)+(c)-1)/(c)))
/* 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_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 */
/* 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;
unsigned int 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 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, 0);
out_be32(&regs->mdma2, 0);
out_be32(&regs->udma1, 0);
out_be32(&regs->udma2, 0);
out_be32(&regs->udma3, 0);
out_be32(&regs->udma4, 0);
out_be32(&regs->udma5, 0);
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) {
printk(KERN_ERR DRV_NAME
": Trying to select invalid PIO mode %d\n", pio);
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_std_dev_select(ap,device);
}
static struct scsi_host_template mpc52xx_ata_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static struct ata_port_operations mpc52xx_ata_port_ops = {
.inherits = &ata_sff_port_ops,
.dev_select = mpc52xx_ata_dev_select,
.cable_detect = ata_cable_40wire,
.set_piomode = mpc52xx_ata_set_piomode,
.post_internal_cmd = ATA_OP_NULL,
};
static int __devinit
mpc52xx_ata_init_one(struct device *dev, struct mpc52xx_ata_priv *priv,
unsigned long raw_ata_regs)
{
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 = 0x1f; /* Up to PIO4 */
ap->mwdma_mask = 0x00; /* No MWDMA */
ap->udma_mask = 0x00; /* No UDMA */
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_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 of_device *op, const struct of_device_id *match)
{
unsigned int ipb_freq;
struct resource res_mem;
int ata_irq;
struct mpc52xx_ata __iomem *ata_regs;
struct mpc52xx_ata_priv *priv;
int rv;
/* Get ipb frequency */
ipb_freq = mpc52xx_find_ipb_freq(op->node);
if (!ipb_freq) {
printk(KERN_ERR DRV_NAME ": "
"Unable to find IPB Bus frequency\n" );
return -ENODEV;
}
/* Get IRQ and register */
rv = of_address_to_resource(op->node, 0, &res_mem);
if (rv) {
printk(KERN_ERR DRV_NAME ": "
"Error while parsing device node resource\n" );
return rv;
}
ata_irq = irq_of_parse_and_map(op->node, 0);
if (ata_irq == NO_IRQ) {
printk(KERN_ERR DRV_NAME ": "
"Error while mapping the irq\n");
return -EINVAL;
}
/* Request mem region */
if (!devm_request_mem_region(&op->dev, res_mem.start,
sizeof(struct mpc52xx_ata), DRV_NAME)) {
printk(KERN_ERR DRV_NAME ": "
"Error while requesting mem region\n");
rv = -EBUSY;
goto err;
}
/* Remap registers */
ata_regs = devm_ioremap(&op->dev, res_mem.start,
sizeof(struct mpc52xx_ata));
if (!ata_regs) {
printk(KERN_ERR DRV_NAME ": "
"Error while mapping register set\n");
rv = -ENOMEM;
goto err;
}
/* Prepare our private structure */
priv = devm_kzalloc(&op->dev, sizeof(struct mpc52xx_ata_priv),
GFP_ATOMIC);
if (!priv) {
printk(KERN_ERR DRV_NAME ": "
"Error while allocating private structure\n");
rv = -ENOMEM;
goto err;
}
priv->ipb_period = 1000000000 / (ipb_freq / 1000);
priv->ata_regs = ata_regs;
priv->ata_irq = ata_irq;
priv->csel = -1;
/* Init the hw */
rv = mpc52xx_ata_hw_init(priv);
if (rv) {
printk(KERN_ERR DRV_NAME ": Error during HW init\n");
goto err;
}
/* Register ourselves to libata */
rv = mpc52xx_ata_init_one(&op->dev, priv, res_mem.start);
if (rv) {
printk(KERN_ERR DRV_NAME ": "
"Error while registering to ATA layer\n");
return rv;
}
/* Done */
return 0;
/* Error path */
err:
irq_dispose_mapping(ata_irq);
return rv;
}
static int
mpc52xx_ata_remove(struct of_device *op)
{
struct mpc52xx_ata_priv *priv;
priv = mpc52xx_ata_remove_one(&op->dev);
irq_dispose_mapping(priv->ata_irq);
return 0;
}
#ifdef CONFIG_PM
static int
mpc52xx_ata_suspend(struct of_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 of_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) {
printk(KERN_ERR DRV_NAME ": Error during HW init\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 of_platform_driver mpc52xx_ata_of_platform_driver = {
.owner = THIS_MODULE,
.name = DRV_NAME,
.match_table = mpc52xx_ata_of_match,
.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,
},
};
/* ======================================================================== */
/* Module */
/* ======================================================================== */
static int __init
mpc52xx_ata_init(void)
{
printk(KERN_INFO "ata: MPC52xx IDE/ATA libata driver\n");
return of_register_platform_driver(&mpc52xx_ata_of_platform_driver);
}
static void __exit
mpc52xx_ata_exit(void)
{
of_unregister_platform_driver(&mpc52xx_ata_of_platform_driver);
}
module_init(mpc52xx_ata_init);
module_exit(mpc52xx_ata_exit);
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);
MODULE_VERSION(DRV_VERSION);
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