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![Sergei Shtylyov](/assets/img/avatar_default.png)
The IDE code assumed for years that the bit 1 of the identify data word 53 also covers the validity of the SW/MW DMA information in words 62 and 63, but it has always covered only words 64 thru 70, with words 62 and 63 being defined in the original ATA spec, not in ATA-2... This fix however should only concern *very* old hard disks and rather old CF cards... Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
354 lines
9.2 KiB
C
354 lines
9.2 KiB
C
/*
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* Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
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* Copyright (C) 2007 Bartlomiej Zolnierkiewicz
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*
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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/module.h>
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#include <linux/types.h>
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#include <linux/kernel.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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#define DRV_NAME "sc1200"
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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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/*
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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 void sc1200_tunepio(ide_drive_t *drive, u8 pio)
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{
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ide_hwif_t *hwif = drive->hwif;
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struct pci_dev *pdev = to_pci_dev(hwif->dev);
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unsigned int basereg = hwif->channel ? 0x50 : 0x40, format = 0;
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pci_read_config_dword(pdev, 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(pdev, basereg + ((drive->dn & 1) << 3),
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sc1200_pio_timings[format][pio]);
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}
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/*
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* The SC1200 specifies that two drives sharing a cable cannot mix
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* UDMA/MDMA. It has to be one or the other, for the pair, though
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* different timings can still be chosen for each drive. We could
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* set the appropriate timing bits on the fly, but that might be
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* a bit confusing. So, for now we statically handle this requirement
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* by looking at our mate drive to see what it is capable of, before
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* choosing a mode for our own drive.
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*/
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static u8 sc1200_udma_filter(ide_drive_t *drive)
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{
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ide_hwif_t *hwif = drive->hwif;
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ide_drive_t *mate = ide_get_pair_dev(drive);
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u16 *mateid;
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u8 mask = hwif->ultra_mask;
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if (mate == NULL)
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goto out;
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mateid = mate->id;
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if (ata_id_has_dma(mateid) && __ide_dma_bad_drive(mate) == 0) {
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if ((mateid[ATA_ID_FIELD_VALID] & 4) &&
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(mateid[ATA_ID_UDMA_MODES] & 7))
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goto out;
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if (mateid[ATA_ID_MWDMA_MODES] & 7)
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mask = 0;
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}
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out:
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return mask;
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}
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static void sc1200_set_dma_mode(ide_drive_t *drive, const u8 mode)
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{
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ide_hwif_t *hwif = drive->hwif;
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struct pci_dev *dev = to_pci_dev(hwif->dev);
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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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static const u32 udma_timing[3][3] = {
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{ 0x00921250, 0x00911140, 0x00911030 },
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{ 0x00932470, 0x00922260, 0x00922140 },
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{ 0x009436a1, 0x00933481, 0x00923261 },
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};
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static const u32 mwdma_timing[3][3] = {
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{ 0x00077771, 0x00012121, 0x00002020 },
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{ 0x000bbbb2, 0x00024241, 0x00013131 },
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{ 0x000ffff3, 0x00035352, 0x00015151 },
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};
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pci_clock = sc1200_get_pci_clock();
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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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if (mode >= XFER_UDMA_0)
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timings = udma_timing[pci_clock][mode - XFER_UDMA_0];
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else
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timings = mwdma_timing[pci_clock][mode - XFER_MW_DMA_0];
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if ((drive->dn & 1) == 0) {
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pci_read_config_dword(dev, basereg + 4, ®);
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timings |= reg & 0x80000000; /* preserve PIO format bit */
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pci_write_config_dword(dev, basereg + 4, timings);
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} else
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pci_write_config_dword(dev, basereg + 12, timings);
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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_dma_end(ide_drive_t *drive)
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{
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ide_hwif_t *hwif = drive->hwif;
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unsigned long dma_base = hwif->dma_base;
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u8 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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return (dma_stat & 7) != 4; /* verify good DMA status */
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}
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/*
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* sc1200_set_pio_mode() handles 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_set_pio_mode(ide_drive_t *drive, const u8 pio)
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{
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ide_hwif_t *hwif = drive->hwif;
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int mode = -1;
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/*
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* bad abuse of ->set_pio_mode interface
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*/
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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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ide_dma_off_quietly(drive);
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if (ide_set_dma_mode(drive, mode) == 0 &&
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(drive->dev_flags & IDE_DFLAG_USING_DMA))
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hwif->dma_ops->dma_host_set(drive, 1);
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return;
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}
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sc1200_tunepio(drive, pio);
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}
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#ifdef CONFIG_PM
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struct sc1200_saved_state {
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u32 regs[8];
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};
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static int sc1200_suspend (struct pci_dev *dev, pm_message_t state)
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{
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printk("SC1200: suspend(%u)\n", state.event);
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/*
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* we only save state when going from full power to less
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*/
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if (state.event == PM_EVENT_ON) {
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struct ide_host *host = pci_get_drvdata(dev);
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struct sc1200_saved_state *ss = host->host_priv;
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unsigned int r;
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/*
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* save timing registers
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* (this may be unnecessary if BIOS also does it)
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*/
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for (r = 0; r < 8; r++)
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pci_read_config_dword(dev, 0x40 + r * 4, &ss->regs[r]);
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}
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pci_disable_device(dev);
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pci_set_power_state(dev, pci_choose_state(dev, 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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struct ide_host *host = pci_get_drvdata(dev);
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struct sc1200_saved_state *ss = host->host_priv;
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unsigned int r;
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int i;
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i = pci_enable_device(dev);
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if (i)
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return i;
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/*
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* restore timing registers
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* (this may be unnecessary if BIOS also does it)
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*/
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for (r = 0; r < 8; r++)
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pci_write_config_dword(dev, 0x40 + r * 4, ss->regs[r]);
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return 0;
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}
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#endif
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static const struct ide_port_ops sc1200_port_ops = {
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.set_pio_mode = sc1200_set_pio_mode,
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.set_dma_mode = sc1200_set_dma_mode,
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.udma_filter = sc1200_udma_filter,
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};
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static const struct ide_dma_ops sc1200_dma_ops = {
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.dma_host_set = ide_dma_host_set,
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.dma_setup = ide_dma_setup,
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.dma_start = ide_dma_start,
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.dma_end = sc1200_dma_end,
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.dma_test_irq = ide_dma_test_irq,
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.dma_lost_irq = ide_dma_lost_irq,
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.dma_timer_expiry = ide_dma_sff_timer_expiry,
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.dma_sff_read_status = ide_dma_sff_read_status,
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};
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static const struct ide_port_info sc1200_chipset __devinitdata = {
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.name = DRV_NAME,
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.port_ops = &sc1200_port_ops,
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.dma_ops = &sc1200_dma_ops,
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.host_flags = IDE_HFLAG_SERIALIZE |
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IDE_HFLAG_POST_SET_MODE |
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IDE_HFLAG_ABUSE_DMA_MODES,
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.pio_mask = ATA_PIO4,
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.mwdma_mask = ATA_MWDMA2,
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.udma_mask = ATA_UDMA2,
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};
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static int __devinit sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
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{
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struct sc1200_saved_state *ss = NULL;
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int rc;
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#ifdef CONFIG_PM
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ss = kmalloc(sizeof(*ss), GFP_KERNEL);
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if (ss == NULL)
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return -ENOMEM;
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#endif
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rc = ide_pci_init_one(dev, &sc1200_chipset, ss);
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if (rc)
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kfree(ss);
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return rc;
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}
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static const struct pci_device_id sc1200_pci_tbl[] = {
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{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), 0},
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{ 0, },
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};
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MODULE_DEVICE_TABLE(pci, sc1200_pci_tbl);
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static struct pci_driver sc1200_pci_driver = {
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.name = "SC1200_IDE",
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.id_table = sc1200_pci_tbl,
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.probe = sc1200_init_one,
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.remove = ide_pci_remove,
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#ifdef CONFIG_PM
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.suspend = sc1200_suspend,
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.resume = sc1200_resume,
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#endif
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};
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static int __init sc1200_ide_init(void)
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{
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return ide_pci_register_driver(&sc1200_pci_driver);
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}
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static void __exit sc1200_ide_exit(void)
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{
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pci_unregister_driver(&sc1200_pci_driver);
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}
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module_init(sc1200_ide_init);
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module_exit(sc1200_ide_exit);
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MODULE_AUTHOR("Mark Lord");
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MODULE_DESCRIPTION("PCI driver module for NS SC1200 IDE");
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MODULE_LICENSE("GPL");
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