519 lines
14 KiB
C
519 lines
14 KiB
C
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/*
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* linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003
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*
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* Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
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* May be copied or modified under the terms of the GNU General Public License
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*
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* Development of this chipset driver was funded
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* by the nice folks at National Semiconductor.
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*
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* Documentation:
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* Available from National Semiconductor
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/ioport.h>
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#include <linux/blkdev.h>
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#include <linux/hdreg.h>
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#include <linux/interrupt.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/ide.h>
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#include <linux/pm.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#define SC1200_REV_A 0x00
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#define SC1200_REV_B1 0x01
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#define SC1200_REV_B3 0x02
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#define SC1200_REV_C1 0x03
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#define SC1200_REV_D1 0x04
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#define PCI_CLK_33 0x00
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#define PCI_CLK_48 0x01
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#define PCI_CLK_66 0x02
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#define PCI_CLK_33A 0x03
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static unsigned short sc1200_get_pci_clock (void)
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{
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unsigned char chip_id, silicon_revision;
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unsigned int pci_clock;
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/*
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* Check the silicon revision, as not all versions of the chip
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* have the register with the fast PCI bus timings.
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*/
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chip_id = inb (0x903c);
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silicon_revision = inb (0x903d);
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// Read the fast pci clock frequency
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if (chip_id == 0x04 && silicon_revision < SC1200_REV_B1) {
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pci_clock = PCI_CLK_33;
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} else {
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// check clock generator configuration (cfcc)
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// the clock is in bits 8 and 9 of this word
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pci_clock = inw (0x901e);
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pci_clock >>= 8;
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pci_clock &= 0x03;
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if (pci_clock == PCI_CLK_33A)
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pci_clock = PCI_CLK_33;
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}
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return pci_clock;
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}
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extern char *ide_xfer_verbose (byte xfer_rate);
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/*
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* Set a new transfer mode at the drive
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*/
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static int sc1200_set_xfer_mode (ide_drive_t *drive, byte mode)
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{
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printk("%s: sc1200_set_xfer_mode(%s)\n", drive->name, ide_xfer_verbose(mode));
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return ide_config_drive_speed(drive, mode);
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}
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/*
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* Here are the standard PIO mode 0-4 timings for each "format".
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* Format-0 uses fast data reg timings, with slower command reg timings.
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* Format-1 uses fast timings for all registers, but won't work with all drives.
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*/
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static const unsigned int sc1200_pio_timings[4][5] =
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{{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz
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{0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz
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{0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz
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{0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}}; // format1, 66Mhz
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/*
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* After chip reset, the PIO timings are set to 0x00009172, which is not valid.
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*/
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//#define SC1200_BAD_PIO(timings) (((timings)&~0x80000000)==0x00009172)
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static int sc1200_autoselect_dma_mode (ide_drive_t *drive)
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{
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int udma_ok = 1, mode = 0;
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ide_hwif_t *hwif = HWIF(drive);
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int unit = drive->select.b.unit;
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ide_drive_t *mate = &hwif->drives[unit^1];
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struct hd_driveid *id = drive->id;
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/*
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* The SC1200 specifies that two drives sharing a cable cannot
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* mix UDMA/MDMA. It has to be one or the other, for the pair,
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* though different timings can still be chosen for each drive.
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* We could set the appropriate timing bits on the fly,
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* but that might be a bit confusing. So, for now we statically
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* handle this requirement by looking at our mate drive to see
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* what it is capable of, before choosing a mode for our own drive.
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*/
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if (mate->present) {
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struct hd_driveid *mateid = mate->id;
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if (mateid && (mateid->capability & 1) && !__ide_dma_bad_drive(mate)) {
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if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
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udma_ok = 1;
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else if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
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udma_ok = 0;
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else
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udma_ok = 1;
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}
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}
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/*
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* Now see what the current drive is capable of,
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* selecting UDMA only if the mate said it was ok.
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*/
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if (id && (id->capability & 1) && hwif->autodma && !__ide_dma_bad_drive(drive)) {
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if (udma_ok && (id->field_valid & 4) && (id->dma_ultra & 7)) {
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if (id->dma_ultra & 4)
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mode = XFER_UDMA_2;
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else if (id->dma_ultra & 2)
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mode = XFER_UDMA_1;
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else if (id->dma_ultra & 1)
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mode = XFER_UDMA_0;
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}
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if (!mode && (id->field_valid & 2) && (id->dma_mword & 7)) {
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if (id->dma_mword & 4)
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mode = XFER_MW_DMA_2;
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else if (id->dma_mword & 2)
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mode = XFER_MW_DMA_1;
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else if (id->dma_mword & 1)
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mode = XFER_MW_DMA_0;
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}
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}
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return mode;
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}
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/*
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* sc1200_config_dma2() handles selection/setting of DMA/UDMA modes
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* for both the chipset and drive.
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*/
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static int sc1200_config_dma2 (ide_drive_t *drive, int mode)
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{
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ide_hwif_t *hwif = HWIF(drive);
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int unit = drive->select.b.unit;
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unsigned int reg, timings;
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unsigned short pci_clock;
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unsigned int basereg = hwif->channel ? 0x50 : 0x40;
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/*
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* Default to DMA-off in case we run into trouble here.
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*/
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hwif->ide_dma_off_quietly(drive); /* turn off DMA while we fiddle */
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outb(inb(hwif->dma_base+2)&~(unit?0x40:0x20), hwif->dma_base+2); /* clear DMA_capable bit */
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/*
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* Tell the drive to switch to the new mode; abort on failure.
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*/
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if (!mode || sc1200_set_xfer_mode(drive, mode)) {
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printk("SC1200: set xfer mode failure\n");
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return 1; /* failure */
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}
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pci_clock = sc1200_get_pci_clock();
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/*
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* Now tune the chipset to match the drive:
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*
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* Note that each DMA mode has several timings associated with it.
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* The correct timing depends on the fast PCI clock freq.
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*/
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timings = 0;
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switch (mode) {
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case XFER_UDMA_0:
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switch (pci_clock) {
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case PCI_CLK_33: timings = 0x00921250; break;
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case PCI_CLK_48: timings = 0x00932470; break;
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case PCI_CLK_66: timings = 0x009436a1; break;
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}
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break;
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case XFER_UDMA_1:
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switch (pci_clock) {
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case PCI_CLK_33: timings = 0x00911140; break;
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case PCI_CLK_48: timings = 0x00922260; break;
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case PCI_CLK_66: timings = 0x00933481; break;
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}
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break;
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case XFER_UDMA_2:
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switch (pci_clock) {
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case PCI_CLK_33: timings = 0x00911030; break;
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case PCI_CLK_48: timings = 0x00922140; break;
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case PCI_CLK_66: timings = 0x00923261; break;
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}
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break;
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case XFER_MW_DMA_0:
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switch (pci_clock) {
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case PCI_CLK_33: timings = 0x00077771; break;
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case PCI_CLK_48: timings = 0x000bbbb2; break;
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case PCI_CLK_66: timings = 0x000ffff3; break;
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}
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break;
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case XFER_MW_DMA_1:
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switch (pci_clock) {
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case PCI_CLK_33: timings = 0x00012121; break;
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case PCI_CLK_48: timings = 0x00024241; break;
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case PCI_CLK_66: timings = 0x00035352; break;
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}
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break;
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case XFER_MW_DMA_2:
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switch (pci_clock) {
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case PCI_CLK_33: timings = 0x00002020; break;
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case PCI_CLK_48: timings = 0x00013131; break;
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case PCI_CLK_66: timings = 0x00015151; break;
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}
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break;
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}
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if (timings == 0) {
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printk("%s: sc1200_config_dma: huh? mode=%02x clk=%x \n", drive->name, mode, pci_clock);
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return 1; /* failure */
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}
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if (unit == 0) { /* are we configuring drive0? */
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pci_read_config_dword(hwif->pci_dev, basereg+4, ®);
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timings |= reg & 0x80000000; /* preserve PIO format bit */
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pci_write_config_dword(hwif->pci_dev, basereg+4, timings);
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} else {
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pci_write_config_dword(hwif->pci_dev, basereg+12, timings);
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}
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outb(inb(hwif->dma_base+2)|(unit?0x40:0x20), hwif->dma_base+2); /* set DMA_capable bit */
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/*
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* Finally, turn DMA on in software, and exit.
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*/
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return hwif->ide_dma_on(drive); /* success */
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}
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/*
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* sc1200_config_dma() handles selection/setting of DMA/UDMA modes
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* for both the chipset and drive.
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*/
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static int sc1200_config_dma (ide_drive_t *drive)
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{
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return sc1200_config_dma2(drive, sc1200_autoselect_dma_mode(drive));
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}
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/* Replacement for the standard ide_dma_end action in
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* dma_proc.
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*
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* returns 1 on error, 0 otherwise
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*/
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static int sc1200_ide_dma_end (ide_drive_t *drive)
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{
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ide_hwif_t *hwif = HWIF(drive);
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unsigned long dma_base = hwif->dma_base;
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byte dma_stat;
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dma_stat = inb(dma_base+2); /* get DMA status */
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if (!(dma_stat & 4))
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printk(" ide_dma_end dma_stat=%0x err=%x newerr=%x\n",
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dma_stat, ((dma_stat&7)!=4), ((dma_stat&2)==2));
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outb(dma_stat|0x1b, dma_base+2); /* clear the INTR & ERROR bits */
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outb(inb(dma_base)&~1, dma_base); /* !! DO THIS HERE !! stop DMA */
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drive->waiting_for_dma = 0;
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ide_destroy_dmatable(drive); /* purge DMA mappings */
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return (dma_stat & 7) != 4; /* verify good DMA status */
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}
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/*
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* sc1200_tuneproc() handles selection/setting of PIO modes
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* for both the chipset and drive.
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*
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* All existing BIOSs for this chipset guarantee that all drives
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* will have valid default PIO timings set up before we get here.
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*/
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static void sc1200_tuneproc (ide_drive_t *drive, byte pio) /* mode=255 means "autotune" */
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{
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ide_hwif_t *hwif = HWIF(drive);
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unsigned int format;
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static byte modes[5] = {XFER_PIO_0, XFER_PIO_1, XFER_PIO_2, XFER_PIO_3, XFER_PIO_4};
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int mode = -1;
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switch (pio) {
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case 200: mode = XFER_UDMA_0; break;
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case 201: mode = XFER_UDMA_1; break;
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case 202: mode = XFER_UDMA_2; break;
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case 100: mode = XFER_MW_DMA_0; break;
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case 101: mode = XFER_MW_DMA_1; break;
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case 102: mode = XFER_MW_DMA_2; break;
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}
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if (mode != -1) {
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printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
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(void)sc1200_config_dma2(drive, mode);
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return;
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}
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pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
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printk("SC1200: %s: setting PIO mode%d\n", drive->name, pio);
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if (!sc1200_set_xfer_mode(drive, modes[pio])) {
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unsigned int basereg = hwif->channel ? 0x50 : 0x40;
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pci_read_config_dword (hwif->pci_dev, basereg+4, &format);
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format = (format >> 31) & 1;
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if (format)
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format += sc1200_get_pci_clock();
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pci_write_config_dword(hwif->pci_dev, basereg + (drive->select.b.unit << 3), sc1200_pio_timings[format][pio]);
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}
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}
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static ide_hwif_t *lookup_pci_dev (ide_hwif_t *prev, struct pci_dev *dev)
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{
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int h;
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for (h = 0; h < MAX_HWIFS; h++) {
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ide_hwif_t *hwif = &ide_hwifs[h];
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if (prev) {
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if (hwif == prev)
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prev = NULL; // found previous, now look for next match
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} else {
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if (hwif && hwif->pci_dev == dev)
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return hwif; // found next match
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}
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}
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return NULL; // not found
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}
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typedef struct sc1200_saved_state_s {
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__u32 regs[4];
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} sc1200_saved_state_t;
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static int sc1200_suspend (struct pci_dev *dev, u32 state)
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{
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ide_hwif_t *hwif = NULL;
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printk("SC1200: suspend(%u)\n", state);
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if (state == 0) {
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// we only save state when going from full power to less
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//
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// Loop over all interfaces that are part of this PCI device:
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//
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while ((hwif = lookup_pci_dev(hwif, dev)) != NULL) {
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sc1200_saved_state_t *ss;
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unsigned int basereg, r;
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//
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// allocate a permanent save area, if not already allocated
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//
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ss = (sc1200_saved_state_t *)hwif->config_data;
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if (ss == NULL) {
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ss = kmalloc(sizeof(sc1200_saved_state_t), GFP_KERNEL);
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if (ss == NULL)
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return -ENOMEM;
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hwif->config_data = (unsigned long)ss;
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}
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ss = (sc1200_saved_state_t *)hwif->config_data;
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//
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// Save timing registers: this may be unnecessary if
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// BIOS also does it
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//
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basereg = hwif->channel ? 0x50 : 0x40;
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for (r = 0; r < 4; ++r) {
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pci_read_config_dword (hwif->pci_dev, basereg + (r<<2), &ss->regs[r]);
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}
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}
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}
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/* You don't need to iterate over disks -- sysfs should have done that for you already */
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pci_disable_device(dev);
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pci_set_power_state(dev,state);
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dev->current_state = state;
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return 0;
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}
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static int sc1200_resume (struct pci_dev *dev)
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{
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ide_hwif_t *hwif = NULL;
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printk("SC1200: resume\n");
|
||
|
pci_set_power_state(dev,0); // bring chip back from sleep state
|
||
|
dev->current_state = 0;
|
||
|
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, d, format;
|
||
|
sc1200_saved_state_t *ss = (sc1200_saved_state_t *)hwif->config_data;
|
||
|
printk("%s: SC1200: resume\n", hwif->name);
|
||
|
|
||
|
//
|
||
|
// 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]);
|
||
|
}
|
||
|
}
|
||
|
//
|
||
|
// Re-program drive PIO modes
|
||
|
//
|
||
|
pci_read_config_dword(hwif->pci_dev, basereg+4, &format);
|
||
|
format = (format >> 31) & 1;
|
||
|
if (format)
|
||
|
format += sc1200_get_pci_clock();
|
||
|
for (d = 0; d < 2; ++d) {
|
||
|
ide_drive_t *drive = &(hwif->drives[d]);
|
||
|
if (drive->present) {
|
||
|
unsigned int pio, timings;
|
||
|
pci_read_config_dword(hwif->pci_dev, basereg+(drive->select.b.unit << 3), &timings);
|
||
|
for (pio = 0; pio <= 4; ++pio) {
|
||
|
if (sc1200_pio_timings[format][pio] == timings)
|
||
|
break;
|
||
|
}
|
||
|
if (pio > 4)
|
||
|
pio = 255; /* autotune */
|
||
|
(void)sc1200_tuneproc(drive, pio);
|
||
|
}
|
||
|
}
|
||
|
//
|
||
|
// Re-program drive DMA modes
|
||
|
//
|
||
|
for (d = 0; d < MAX_DRIVES; ++d) {
|
||
|
ide_drive_t *drive = &(hwif->drives[d]);
|
||
|
if (drive->present && !__ide_dma_bad_drive(drive)) {
|
||
|
int was_using_dma = drive->using_dma;
|
||
|
hwif->ide_dma_off_quietly(drive);
|
||
|
sc1200_config_dma(drive);
|
||
|
if (!was_using_dma && drive->using_dma) {
|
||
|
hwif->ide_dma_off_quietly(drive);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* This gets invoked by the IDE driver once for each channel,
|
||
|
* and performs channel-specific pre-initialization before drive probing.
|
||
|
*/
|
||
|
static void __init init_hwif_sc1200 (ide_hwif_t *hwif)
|
||
|
{
|
||
|
if (hwif->mate)
|
||
|
hwif->serialized = hwif->mate->serialized = 1;
|
||
|
hwif->autodma = 0;
|
||
|
if (hwif->dma_base) {
|
||
|
hwif->ide_dma_check = &sc1200_config_dma;
|
||
|
hwif->ide_dma_end = &sc1200_ide_dma_end;
|
||
|
if (!noautodma)
|
||
|
hwif->autodma = 1;
|
||
|
hwif->tuneproc = &sc1200_tuneproc;
|
||
|
}
|
||
|
hwif->atapi_dma = 1;
|
||
|
hwif->ultra_mask = 0x07;
|
||
|
hwif->mwdma_mask = 0x07;
|
||
|
|
||
|
hwif->drives[0].autodma = hwif->autodma;
|
||
|
hwif->drives[1].autodma = hwif->autodma;
|
||
|
}
|
||
|
|
||
|
static ide_pci_device_t sc1200_chipset __devinitdata = {
|
||
|
.name = "SC1200",
|
||
|
.init_hwif = init_hwif_sc1200,
|
||
|
.channels = 2,
|
||
|
.autodma = AUTODMA,
|
||
|
.bootable = ON_BOARD,
|
||
|
};
|
||
|
|
||
|
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 struct pci_device_id sc1200_pci_tbl[] = {
|
||
|
{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_IDE, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 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,
|
||
|
.suspend = sc1200_suspend,
|
||
|
.resume = sc1200_resume,
|
||
|
};
|
||
|
|
||
|
static int 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");
|