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linux/drivers/ata/pata_mpc52xx.c
Alan Cox 0eaea364ed pata_mpc52xx: remove un-needed assignment 
ata_irq is always assigned so does not need to be initialised to zero.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2008-01-23 05:24:17 -05:00

548 lines
15 KiB
C
Raw Blame History

/*
* 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 void
mpc52xx_ata_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, ata_std_prereset, ata_std_softreset, NULL,
ata_std_postreset);
}
static struct scsi_host_template mpc52xx_ata_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
.ioctl = ata_scsi_ioctl,
.queuecommand = ata_scsi_queuecmd,
.can_queue = ATA_DEF_QUEUE,
.this_id = ATA_SHT_THIS_ID,
.sg_tablesize = LIBATA_MAX_PRD,
.max_sectors = ATA_MAX_SECTORS,
.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
.emulated = ATA_SHT_EMULATED,
.use_clustering = ATA_SHT_USE_CLUSTERING,
.proc_name = DRV_NAME,
.dma_boundary = ATA_DMA_BOUNDARY,
.slave_configure = ata_scsi_slave_config,
.bios_param = ata_std_bios_param,
};
static struct ata_port_operations mpc52xx_ata_port_ops = {
.set_piomode = mpc52xx_ata_set_piomode,
.dev_select = mpc52xx_ata_dev_select,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = mpc52xx_ata_error_handler,
.cable_detect = ata_cable_40wire,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ata_data_xfer,
.irq_clear = ata_bmdma_irq_clear,
.irq_on = ata_irq_on,
.port_start = ata_port_start,
};
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[] = {
{
.type = "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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