diff options
Diffstat (limited to 'drivers/ide/sc1200.c')
| -rw-r--r-- | drivers/ide/sc1200.c | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/drivers/ide/sc1200.c b/drivers/ide/sc1200.c new file mode 100644 index 000000000..a5b701818 --- /dev/null +++ b/drivers/ide/sc1200.c @@ -0,0 +1,355 @@ +/* + * 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"); |