/*
* Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
* Copyright (C) 2007 Bartlomiej Zolnierkiewicz
*
* May be copied or modified under the terms of the GNU General Public License
*
* Development of this chipset driver was funded
* by the nice folks at National Semiconductor.
*
* Documentation:
* Available from National Semiconductor
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <linux/pm.h>
#include <asm/io.h>
#define DRV_NAME "sc1200"
#define SC1200_REV_A 0x00
#define SC1200_REV_B1 0x01
#define SC1200_REV_B3 0x02
#define SC1200_REV_C1 0x03
#define SC1200_REV_D1 0x04
#define PCI_CLK_33 0x00
#define PCI_CLK_48 0x01
#define PCI_CLK_66 0x02
#define PCI_CLK_33A 0x03
static unsigned short sc1200_get_pci_clock (void)
{
unsigned char chip_id, silicon_revision;
unsigned int pci_clock;
/*
* Check the silicon revision, as not all versions of the chip
* have the register with the fast PCI bus timings.
*/
chip_id = inb (0x903c);
silicon_revision = inb (0x903d);
// Read the fast pci clock frequency
if (chip_id == 0x04 && silicon_revision < SC1200_REV_B1) {
pci_clock = PCI_CLK_33;
} else {
// check clock generator configuration (cfcc)
// the clock is in bits 8 and 9 of this word
pci_clock = inw (0x901e);
pci_clock >>= 8;
pci_clock &= 0x03;
if (pci_clock == PCI_CLK_33A)
pci_clock = PCI_CLK_33;
}
return pci_clock;
}
/*
* Here are the standard PIO mode 0-4 timings for each "format".
* Format-0 uses fast data reg timings, with slower command reg timings.
* Format-1 uses fast timings for all registers, but won't work with all drives.
*/
static const unsigned int sc1200_pio_timings[4][5] =
{{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz
{0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz
{0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz
{0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}}; // format1, 66Mhz
/*
* After chip reset, the PIO timings are set to 0x00009172, which is not valid.
*/
//#define SC1200_BAD_PIO(timings) (((timings)&~0x80000000)==0x00009172)
static void sc1200_tunepio(ide_drive_t *drive, u8 pio)
{
ide_hwif_t *hwif = drive->hwif;
struct pci_dev *pdev = to_pci_dev(hwif->dev);
unsigned int basereg = hwif->channel ? 0x50 : 0x40, format = 0;
pci_read_config_dword(pdev, basereg + 4, &format);
format = (format >> 31) & 1;
if (format)
format += sc1200_get_pci_clock();
pci_write_config_dword(pdev, basereg + ((drive->dn & 1) << 3),
sc1200_pio_timings[format][pio]);
}
/*
* The SC1200 specifies that two drives sharing a cable cannot mix
* UDMA/MDMA. It has to be one or the other, for the pair, though
* different timings can still be chosen for each drive. We could
* set the appropriate timing bits on the fly, but that might be
* a bit confusing. So, for now we statically handle this requirement
* by looking at our mate drive to see what it is capable of, before
* choosing a mode for our own drive.
*/
static u8 sc1200_udma_filter(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
ide_drive_t *mate = ide_get_pair_dev(drive);
u16 *mateid;
u8 mask = hwif->ultra_mask;
if (mate == NULL)
goto out;
mateid = mate->id;
if (ata_id_has_dma(mateid) && __ide_dma_bad_drive(mate) == 0) {
if ((mateid[ATA_ID_FIELD_VALID] & 4) &&
(mateid[ATA_ID_UDMA_MODES] & 7))
goto out;
if (mateid[ATA_ID_MWDMA_MODES] & 7)
mask = 0;
}
out:
return mask;
}
static void sc1200_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
unsigned int reg, timings;
unsigned short pci_clock;
unsigned int basereg = hwif->channel ? 0x50 : 0x40;
const u8 mode = drive->dma_mode;
static const u32 udma_timing[3][3] = {
{ 0x00921250, 0x00911140, 0x00911030 },
{ 0x00932470, 0x00922260, 0x00922140 },
{ 0x009436a1, 0x00933481, 0x00923261 },
};
static const u32 mwdma_timing[3][3] = {
{ 0x00077771, 0x00012121, 0x00002020 },
{ 0x000bbbb2, 0x00024241, 0x00013131 },
{ 0x000ffff3, 0x00035352, 0x00015151 },
};
pci_clock = sc1200_get_pci_clock();
/*
* Note that each DMA mode has several timings associated with it.
* The correct timing depends on the fast PCI clock freq.
*/
if (mode >= XFER_UDMA_0)
timings = udma_timing[pci_clock][mode - XFER_UDMA_0];
else
timings = mwdma_timing[pci_clock][mode - XFER_MW_DMA_0];
if ((drive->dn & 1) == 0) {
pci_read_config_dword(dev, basereg + 4, ®);
timings |= reg & 0x80000000; /* preserve PIO format bit */
pci_write_config_dword(dev, basereg + 4, timings);
} else
pci_write_config_dword(dev, basereg + 12, timings);
}
/* Replacement for the standard ide_dma_end action in
* dma_proc.
*
* returns 1 on error, 0 otherwise
*/
static int sc1200_dma_end(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
unsigned long dma_base = hwif->dma_base;
u8 dma_stat;
dma_stat = inb(dma_base+2); /* get DMA status */
if (!(dma_stat & 4))
printk(" ide_dma_end dma_stat=%0x err=%x newerr=%x\n",
dma_stat, ((dma_stat&7)!=4), ((dma_stat&2)==2));
outb(dma_stat|0x1b, dma_base+2); /* clear the INTR & ERROR bits */
outb(inb(dma_base)&~1, dma_base); /* !! DO THIS HERE !! stop DMA */
return (dma_stat & 7) != 4; /* verify good DMA status */
}
/*
* sc1200_set_pio_mode() handles setting of PIO modes
* for both the chipset and drive.
*
* All existing BIOSs for this chipset guarantee that all drives
* will have valid default PIO timings set up before we get here.
*/
static void sc1200_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
int mode = -1;
const u8 pio = drive->pio_mode - XFER_PIO_0;
/*
* bad abuse of ->set_pio_mode interface
*/
switch (pio) {
case 200: mode = XFER_UDMA_0; break;
case 201: mode = XFER_UDMA_1; break;
case 202: mode = XFER_UDMA_2; break;
case 100: mode = XFER_MW_DMA_0; break;
case 101: mode = XFER_MW_DMA_1; break;
case 102: mode = XFER_MW_DMA_2; break;
}
if (mode != -1) {
printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
ide_dma_off_quietly(drive);
if (ide_set_dma_mode(drive, mode) == 0 &&
(drive->dev_flags & IDE_DFLAG_USING_DMA))
hwif->dma_ops->dma_host_set(drive, 1);
return;
}
sc1200_tunepio(drive, pio);
}
#ifdef CONFIG_PM
struct sc1200_saved_state {
u32 regs[8];
};
static int sc1200_suspend (struct pci_dev *dev, pm_message_t state)
{
printk("SC1200: suspend(%u)\n", state.event);
/*
* we only save state when going from full power to less
*/
if (state.event == PM_EVENT_ON) {
struct ide_host *host = pci_get_drvdata(dev);
struct sc1200_saved_state *ss = host->host_priv;
unsigned int r;
/*
* save timing registers
* (this may be unnecessary if BIOS also does it)
*/
for (r = 0; r < 8; r++)
pci_read_config_dword(dev, 0x40 + r * 4, &ss->regs[r]);
}
pci_disable_device(dev);
pci_set_power_state(dev, pci_choose_state(dev, state));
return 0;
}
static int sc1200_resume (struct pci_dev *dev)
{
struct ide_host *host = pci_get_drvdata(dev);
struct sc1200_saved_state *ss = host->host_priv;
unsigned int r;
int i;
i = pci_enable_device(dev);
if (i)
return i;
/*
* restore timing registers
* (this may be unnecessary if BIOS also does it)
*/
for (r = 0; r < 8; r++)
pci_write_config_dword(dev, 0x40 + r * 4, ss->regs[r]);
return 0;
}
#endif
static const struct ide_port_ops sc1200_port_ops = {
.set_pio_mode = sc1200_set_pio_mode,
.set_dma_mode = sc1200_set_dma_mode,
.udma_filter = sc1200_udma_filter,
};
static const struct ide_dma_ops sc1200_dma_ops = {
.dma_host_set = ide_dma_host_set,
.dma_setup = ide_dma_setup,
.dma_start = ide_dma_start,
.dma_end = sc1200_dma_end,
.dma_test_irq = ide_dma_test_irq,
.dma_lost_irq = ide_dma_lost_irq,
.dma_timer_expiry = ide_dma_sff_timer_expiry,
.dma_sff_read_status = ide_dma_sff_read_status,
};
static const struct ide_port_info sc1200_chipset = {
.name = DRV_NAME,
.port_ops = &sc1200_port_ops,
.dma_ops = &sc1200_dma_ops,
.host_flags = IDE_HFLAG_SERIALIZE |
IDE_HFLAG_POST_SET_MODE |
IDE_HFLAG_ABUSE_DMA_MODES,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA2,
};
static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
struct sc1200_saved_state *ss = NULL;
int rc;
#ifdef CONFIG_PM
ss = kmalloc(sizeof(*ss), GFP_KERNEL);
if (ss == NULL)
return -ENOMEM;
#endif
rc = ide_pci_init_one(dev, &sc1200_chipset, ss);
if (rc)
kfree(ss);
return rc;
}
static const struct pci_device_id sc1200_pci_tbl[] = {
{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), 0},
{ 0, },
};
MODULE_DEVICE_TABLE(pci, sc1200_pci_tbl);
static struct pci_driver sc1200_pci_driver = {
.name = "SC1200_IDE",
.id_table = sc1200_pci_tbl,
.probe = sc1200_init_one,
.remove = ide_pci_remove,
#ifdef CONFIG_PM
.suspend = sc1200_suspend,
.resume = sc1200_resume,
#endif
};
static int __init sc1200_ide_init(void)
{
return ide_pci_register_driver(&sc1200_pci_driver);
}
static void __exit sc1200_ide_exit(void)
{
pci_unregister_driver(&sc1200_pci_driver);
}
module_init(sc1200_ide_init);
module_exit(sc1200_ide_exit);
MODULE_AUTHOR("Mark Lord");
MODULE_DESCRIPTION("PCI driver module for NS SC1200 IDE");
MODULE_LICENSE("GPL");
