linux/drivers/ide/tx4938ide.c
Bartlomiej Zolnierkiewicz 040f6b4f14 tx493xide: use ->pio_mode value to determine pair device speed
Use the current PIO mode value instead of the physical maximum one
of the pair device on the port to determine PIO commmand timings used
for both devices on the port.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-19 01:52:35 -08:00

222 lines
5.7 KiB
C

/*
* TX4938 internal IDE driver
* Based on tx4939ide.c.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* (C) Copyright TOSHIBA CORPORATION 2005-2007
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <asm/ide.h>
#include <asm/txx9/tx4938.h>
static void tx4938ide_tune_ebusc(unsigned int ebus_ch,
unsigned int gbus_clock,
u8 pio)
{
struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
u64 cr = __raw_readq(&tx4938_ebuscptr->cr[ebus_ch]);
unsigned int sp = (cr >> 4) & 3;
unsigned int clock = gbus_clock / (4 - sp);
unsigned int cycle = 1000000000 / clock;
unsigned int shwt;
int wt;
/* Minimum DIOx- active time */
wt = DIV_ROUND_UP(t->act8b, cycle) - 2;
/* IORDY setup time: 35ns */
wt = max_t(int, wt, DIV_ROUND_UP(35, cycle));
/* actual wait-cycle is max(wt & ~1, 1) */
if (wt > 2 && (wt & 1))
wt++;
wt &= ~1;
/* Address-valid to DIOR/DIOW setup */
shwt = DIV_ROUND_UP(t->setup, cycle);
/* -DIOx recovery time (SHWT * 4) and cycle time requirement */
while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle)
shwt++;
if (shwt > 7) {
pr_warning("tx4938ide: SHWT violation (%d)\n", shwt);
shwt = 7;
}
pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n",
ebus_ch, cycle, wt, shwt);
__raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt,
&tx4938_ebuscptr->cr[ebus_ch]);
}
static void tx4938ide_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
struct tx4938ide_platform_info *pdata = hwif->dev->platform_data;
u8 safe = drive->pio_mode - XFER_PIO_0;
ide_drive_t *pair;
pair = ide_get_pair_dev(drive);
if (pair)
safe = min(safe, pair->pio_mode - XFER_PIO_0);
tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe);
}
#ifdef __BIG_ENDIAN
/* custom iops (independent from SWAP_IO_SPACE) */
static void tx4938ide_input_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
void *buf, unsigned int len)
{
unsigned long port = drive->hwif->io_ports.data_addr;
unsigned short *ptr = buf;
unsigned int count = (len + 1) / 2;
while (count--)
*ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
__ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
}
static void tx4938ide_output_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
void *buf, unsigned int len)
{
unsigned long port = drive->hwif->io_ports.data_addr;
unsigned short *ptr = buf;
unsigned int count = (len + 1) / 2;
while (count--) {
__raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
ptr++;
}
__ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
}
static const struct ide_tp_ops tx4938ide_tp_ops = {
.exec_command = ide_exec_command,
.read_status = ide_read_status,
.read_altstatus = ide_read_altstatus,
.write_devctl = ide_write_devctl,
.dev_select = ide_dev_select,
.tf_load = ide_tf_load,
.tf_read = ide_tf_read,
.input_data = tx4938ide_input_data_swap,
.output_data = tx4938ide_output_data_swap,
};
#endif /* __BIG_ENDIAN */
static const struct ide_port_ops tx4938ide_port_ops = {
.set_pio_mode = tx4938ide_set_pio_mode,
};
static const struct ide_port_info tx4938ide_port_info __initdata = {
.port_ops = &tx4938ide_port_ops,
#ifdef __BIG_ENDIAN
.tp_ops = &tx4938ide_tp_ops,
#endif
.host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
.pio_mask = ATA_PIO5,
.chipset = ide_generic,
};
static int __init tx4938ide_probe(struct platform_device *pdev)
{
struct ide_hw hw, *hws[] = { &hw };
struct ide_host *host;
struct resource *res;
struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;
int irq, ret, i;
unsigned long mapbase, mapctl;
struct ide_port_info d = tx4938ide_port_info;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
if (!devm_request_mem_region(&pdev->dev, res->start,
resource_size(res), "tx4938ide"))
return -EBUSY;
mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
8 << pdata->ioport_shift);
mapctl = (unsigned long)devm_ioremap(&pdev->dev,
res->start + 0x10000 +
(6 << pdata->ioport_shift),
1 << pdata->ioport_shift);
if (!mapbase || !mapctl)
return -EBUSY;
memset(&hw, 0, sizeof(hw));
if (pdata->ioport_shift) {
unsigned long port = mapbase;
unsigned long ctl = mapctl;
hw.io_ports_array[0] = port;
#ifdef __BIG_ENDIAN
port++;
ctl++;
#endif
for (i = 1; i <= 7; i++)
hw.io_ports_array[i] =
port + (i << pdata->ioport_shift);
hw.io_ports.ctl_addr = ctl;
} else
ide_std_init_ports(&hw, mapbase, mapctl);
hw.irq = irq;
hw.dev = &pdev->dev;
pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n",
mapbase, mapctl, hw.irq);
if (pdata->gbus_clock)
tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0);
else
d.port_ops = NULL;
ret = ide_host_add(&d, hws, 1, &host);
if (!ret)
platform_set_drvdata(pdev, host);
return ret;
}
static int __exit tx4938ide_remove(struct platform_device *pdev)
{
struct ide_host *host = platform_get_drvdata(pdev);
ide_host_remove(host);
return 0;
}
static struct platform_driver tx4938ide_driver = {
.driver = {
.name = "tx4938ide",
.owner = THIS_MODULE,
},
.remove = __exit_p(tx4938ide_remove),
};
static int __init tx4938ide_init(void)
{
return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
}
static void __exit tx4938ide_exit(void)
{
platform_driver_unregister(&tx4938ide_driver);
}
module_init(tx4938ide_init);
module_exit(tx4938ide_exit);
MODULE_DESCRIPTION("TX4938 internal IDE driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:tx4938ide");