/*
* linux/drivers/ide/pci/sc1200.c Version 0.97 Aug 3 2007
*
* 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/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <linux/pm.h>
#include <asm/io.h>
#include <asm/irq.h>
#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 = hwif->pci_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 = &hwif->drives[(drive->dn & 1) ^ 1];
struct hd_driveid *mateid = mate->id;
u8 mask = hwif->ultra_mask;
if (mate->present == 0)
goto out;
if ((mateid->capability & 1) && __ide_dma_bad_drive(mate) == 0) {
if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
goto out;
if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
mask = 0;
}
out:
return mask;
}
static void sc1200_set_dma_mode(ide_drive_t *drive, const u8 mode)
{
ide_hwif_t *hwif = HWIF(drive);
int unit = drive->select.b.unit;
unsigned int reg, timings;
unsigned short pci_clock;
unsigned int basereg = hwif->channel ? 0x50 : 0x40;
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.
*/
timings = 0;
switch (mode) {
case XFER_UDMA_0:
switch (pci_clock) {
case PCI_CLK_33: timings = 0x00921250; break;
case PCI_CLK_48: timings = 0x00932470; break;
case PCI_CLK_66: timings = 0x009436a1; break;
}
break;
case XFER_UDMA_1:
switch (pci_clock) {
case PCI_CLK_33: timings = 0x00911140; break;
case PCI_CLK_48: timings = 0x00922260; break;
case PCI_CLK_66: timings = 0x00933481; break;
}
break;
case XFER_UDMA_2:
switch (pci_clock) {
case PCI_CLK_33: timings = 0x00911030; break;
case PCI_CLK_48: timings = 0x00922140; break;
case PCI_CLK_66: timings = 0x00923261; break;
}
break;
case XFER_MW_DMA_0:
switch (pci_clock) {
case PCI_CLK_33: timings = 0x00077771; break;
case PCI_CLK_48: timings = 0x000bbbb2; break;
case PCI_CLK_66: timings = 0x000ffff3; break;
}
break;
case XFER_MW_DMA_1:
switch (pci_clock) {
case PCI_CLK_33: timings = 0x00012121; break;
case PCI_CLK_48: timings = 0x00024241; break;
case PCI_CLK_66: timings = 0x00035352; break;
}
break;
case XFER_MW_DMA_2:
switch (pci_clock) {
case PCI_CLK_33: timings = 0x00002020; break;
case PCI_CLK_48: timings = 0x00013131; break;
case PCI_CLK_66: timings = 0x00015151; break;
}
break;
default:
BUG();
break;
}
if (unit == 0) { /* are we configuring drive0? */
pci_read_config_dword(hwif->pci_dev, basereg+4, ®);
timings |= reg & 0x80000000; /* preserve PIO format bit */
pci_write_config_dword(hwif->pci_dev, basereg+4, timings);
} else {
pci_write_config_dword(hwif->pci_dev, basereg+12, timings);
}
}
/* Replacement for the standard ide_dma_end action in
* dma_proc.
*
* returns 1 on error, 0 otherwise
*/
static int sc1200_ide_dma_end (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
unsigned long dma_base = hwif->dma_base;
byte 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 */
drive->waiting_for_dma = 0;
ide_destroy_dmatable(drive); /* purge DMA mappings */
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_drive_t *drive, const u8 pio)
{
ide_hwif_t *hwif = HWIF(drive);
int mode = -1;
/*
* 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);
hwif->dma_off_quietly(drive);
if (ide_set_dma_mode(drive, mode) == 0)
hwif->dma_host_on(drive);
return;
}
sc1200_tunepio(drive, pio);
}
#ifdef CONFIG_PM
static ide_hwif_t *lookup_pci_dev (ide_hwif_t *prev, struct pci_dev *dev)
{
int h;
for (h = 0; h < MAX_HWIFS; h++) {
ide_hwif_t *hwif = &ide_hwifs[h];
if (prev) {
if (hwif == prev)
prev = NULL; // found previous, now look for next match
} else {
if (hwif && hwif->pci_dev == dev)
return hwif; // found next match
}
}
return NULL; // not found
}
typedef struct sc1200_saved_state_s {
__u32 regs[4];
} sc1200_saved_state_t;
static int sc1200_suspend (struct pci_dev *dev, pm_message_t state)
{
ide_hwif_t *hwif = NULL;
printk("SC1200: suspend(%u)\n", state.event);
if (state.event == PM_EVENT_ON) {
// we only save state when going from full power to less
//
// Loop over all interfaces that are part of this PCI device:
//
while ((hwif = lookup_pci_dev(hwif, dev)) != NULL) {
sc1200_saved_state_t *ss;
unsigned int basereg, r;
//
// allocate a permanent save area, if not already allocated
//
ss = (sc1200_saved_state_t *)hwif->config_data;
if (ss == NULL) {
ss = kmalloc(sizeof(sc1200_saved_state_t), GFP_KERNEL);
if (ss == NULL)
return -ENOMEM;
hwif->config_data = (unsigned long)ss;
}
ss = (sc1200_saved_state_t *)hwif->config_data;
//
// Save timing registers: this may be unnecessary if
// BIOS also does it
//
basereg = hwif->channel ? 0x50 : 0x40;
for (r = 0; r < 4; ++r) {
pci_read_config_dword (hwif->pci_dev, basereg + (r<<2), &ss->regs[r]);
}
}
}
/* You don't need to iterate over disks -- sysfs should have done that for you already */
pci_disable_device(dev);
pci_set_power_state(dev, pci_choose_state(dev, state));
dev->current_state = state.event;
return 0;
}
static int sc1200_resume (struct pci_dev *dev)
{
ide_hwif_t *hwif = NULL;
pci_set_power_state(dev, PCI_D0); // bring chip back from sleep state
dev->current_state = PM_EVENT_ON;
pci_enable_device(dev);
//
// loop over all interfaces that are part of this pci device:
//
while ((hwif = lookup_pci_dev(hwif, dev)) != NULL) {
unsigned int basereg, r;
sc1200_saved_state_t *ss = (sc1200_saved_state_t *)hwif->config_data;
//
// Restore timing registers: this may be unnecessary if BIOS also does it
//
basereg = hwif->channel ? 0x50 : 0x40;
if (ss != NULL) {
for (r = 0; r < 4; ++r) {
pci_write_config_dword(hwif->pci_dev, basereg + (r<<2), ss->regs[r]);
}
}
}
return 0;
}
#endif
/*
* This gets invoked by the IDE driver once for each channel,
* and performs channel-specific pre-initialization before drive probing.
*/
static void __devinit init_hwif_sc1200 (ide_hwif_t *hwif)
{
hwif->set_pio_mode = &sc1200_set_pio_mode;
hwif->set_dma_mode = &sc1200_set_dma_mode;
if (hwif->dma_base == 0)
return;
hwif->udma_filter = sc1200_udma_filter;
hwif->ide_dma_end = &sc1200_ide_dma_end;
}
static ide_pci_device_t sc1200_chipset __devinitdata = {
.name = "SC1200",
.init_hwif = init_hwif_sc1200,
.host_flags = IDE_HFLAG_SERIALIZE |
IDE_HFLAG_POST_SET_MODE |
IDE_HFLAG_ABUSE_DMA_MODES |
IDE_HFLAG_BOOTABLE,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA2,
};
static int __devinit sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
return ide_setup_pci_device(dev, &sc1200_chipset);
}
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 driver = {
.name = "SC1200_IDE",
.id_table = sc1200_pci_tbl,
.probe = sc1200_init_one,
#ifdef CONFIG_PM
.suspend = sc1200_suspend,
.resume = sc1200_resume,
#endif
};
static int __init sc1200_ide_init(void)
{
return ide_pci_register_driver(&driver);
}
module_init(sc1200_ide_init);
MODULE_AUTHOR("Mark Lord");
MODULE_DESCRIPTION("PCI driver module for NS SC1200 IDE");
MODULE_LICENSE("GPL");
