/* * linux/drivers/ide/pci/sc1200.c Version 0.95 Jun 16 2007 * * Copyright (C) 2000-2002 Mark Lord * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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; } extern char *ide_xfer_verbose (byte xfer_rate); /* * Set a new transfer mode at the drive */ static int sc1200_set_xfer_mode (ide_drive_t *drive, byte mode) { printk("%s: sc1200_set_xfer_mode(%s)\n", drive->name, ide_xfer_verbose(mode)); return ide_config_drive_speed(drive, mode); } /* * 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 int sc1200_tune_chipset(ide_drive_t *drive, 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; mode = ide_rate_filter(drive, mode); /* * Tell the drive to switch to the new mode; abort on failure. */ if (sc1200_set_xfer_mode(drive, mode)) { printk("SC1200: set xfer mode failure\n"); return 1; /* failure */ } switch (mode) { case XFER_PIO_4: case XFER_PIO_3: case XFER_PIO_2: case XFER_PIO_1: case XFER_PIO_0: sc1200_tunepio(drive, mode - XFER_PIO_0); return 0; } pci_clock = sc1200_get_pci_clock(); /* * Now tune the chipset to match the drive: * * 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); } return 0; /* success */ } /* * sc1200_config_dma() handles selection/setting of DMA/UDMA modes * for both the chipset and drive. */ static int sc1200_config_dma (ide_drive_t *drive) { if (ide_tune_dma(drive)) return 0; return 1; } /* 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_tuneproc() handles selection/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_tuneproc (ide_drive_t *drive, byte pio) /* mode=255 means "autotune" */ { ide_hwif_t *hwif = HWIF(drive); int mode = -1; /* * bad abuse of ->tuneproc 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 (sc1200_tune_chipset(drive, mode) == 0) hwif->dma_host_on(drive); return; } pio = ide_get_best_pio_mode(drive, pio, 4, NULL); printk("SC1200: %s: setting PIO mode%d\n", drive->name, pio); if (sc1200_set_xfer_mode(drive, XFER_PIO_0 + pio) == 0) 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) { if (hwif->mate) hwif->serialized = hwif->mate->serialized = 1; hwif->autodma = 0; if (hwif->dma_base) { hwif->udma_filter = sc1200_udma_filter; 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->speedproc = &sc1200_tune_chipset; } 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, .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_DEVICE(PCI_VENDOR_ID_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");