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it821x.c
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/* * linux/drivers/ide/pci/it821x.c Version 0.16 Jul 3 2007 * * Copyright (C) 2004 Red Hat <alan@redhat.com> * Copyright (C) 2007 Bartlomiej Zolnierkiewicz * * May be copied or modified under the terms of the GNU General Public License * Based in part on the ITE vendor provided SCSI driver. * * Documentation available from * http://www.ite.com.tw/pc/IT8212F_V04.pdf * Some other documents are NDA. * * The ITE8212 isn't exactly a standard IDE controller. It has two * modes. In pass through mode then it is an IDE controller. In its smart * mode its actually quite a capable hardware raid controller disguised * as an IDE controller. Smart mode only understands DMA read/write and * identify, none of the fancier commands apply. The IT8211 is identical * in other respects but lacks the raid mode. * * Errata: * o Rev 0x10 also requires master/slave hold the same DMA timings and * cannot do ATAPI MWDMA. * o The identify data for raid volumes lacks CHS info (technically ok) * but also fails to set the LBA28 and other bits. We fix these in * the IDE probe quirk code. * o If you write LBA48 sized I/O's (ie > 256 sector) in smart mode * raid then the controller firmware dies * o Smart mode without RAID doesn't clear all the necessary identify * bits to reduce the command set to the one used * * This has a few impacts on the driver * - In pass through mode we do all the work you would expect * - In smart mode the clocking set up is done by the controller generally * but we must watch the other limits and filter. * - There are a few extra vendor commands that actually talk to the * controller but only work PIO with no IRQ. * * Vendor areas of the identify block in smart mode are used for the * timing and policy set up. Each HDD in raid mode also has a serial * block on the disk. The hardware extra commands are get/set chip status, * rebuild, get rebuild status. * * In Linux the driver supports pass through mode as if the device was * just another IDE controller. If the smart mode is running then * volumes are managed by the controller firmware and each IDE "disk" * is a raid volume. Even more cute - the controller can do automated * hotplug and rebuild. * * The pass through controller itself is a little demented. It has a * flaw that it has a single set of PIO/MWDMA timings per channel so * non UDMA devices restrict each others performance. It also has a * single clock source per channel so mixed UDMA100/133 performance * isn't perfect and we have to pick a clock. Thankfully none of this * matters in smart mode. ATAPI DMA is not currently supported. * * It seems the smart mode is a win for RAID1/RAID10 but otherwise not. * * TODO * - ATAPI UDMA is ok but not MWDMA it seems * - RAID configuration ioctls * - Move to libata once it grows up */ #include <linux/types.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/delay.h> #include <linux/hdreg.h> #include <linux/ide.h> #include <linux/init.h> #include <asm/io.h> struct it821x_dev { unsigned int smart:1, /* Are we in smart raid mode */ timing10:1; /* Rev 0x10 */ u8 clock_mode; /* 0, ATA_50 or ATA_66 */ u8 want[2][2]; /* Mode/Pri log for master slave */ /* We need these for switching the clock when DMA goes on/off The high byte is the 66Mhz timing */ u16 pio[2]; /* Cached PIO values */ u16 mwdma[2]; /* Cached MWDMA values */ u16 udma[2]; /* Cached UDMA values (per drive) */ }; #define ATA_66 0 #define ATA_50 1 #define ATA_ANY 2 #define UDMA_OFF 0 #define MWDMA_OFF 0 /* * We allow users to force the card into non raid mode without * flashing the alternative BIOS. This is also neccessary right now * for embedded platforms that cannot run a PC BIOS but are using this * device. */ static int it8212_noraid; /** * it821x_program - program the PIO/MWDMA registers * @drive: drive to tune * @timing: timing info * * Program the PIO/MWDMA timing for this channel according to the * current clock. */ static void it821x_program(ide_drive_t *drive, u16 timing) { ide_hwif_t *hwif = drive->hwif; struct it821x_dev *itdev = ide_get_hwifdata(hwif); int channel = hwif->channel; u8 conf; /* Program PIO/MWDMA timing bits */ if(itdev->clock_mode == ATA_66) conf = timing >> 8; else conf = timing & 0xFF; pci_write_config_byte(hwif->pci_dev, 0x54 + 4 * channel, conf); } /** * it821x_program_udma - program the UDMA registers * @drive: drive to tune * @timing: timing info * * Program the UDMA timing for this drive according to the * current clock. */ static void it821x_program_udma(ide_drive_t *drive, u16 timing) { ide_hwif_t *hwif = drive->hwif; struct it821x_dev *itdev = ide_get_hwifdata(hwif); int channel = hwif->channel; int unit = drive->select.b.unit; u8 conf; /* Program UDMA timing bits */ if(itdev->clock_mode == ATA_66) conf = timing >> 8; else conf = timing & 0xFF; if(itdev->timing10 == 0) pci_write_config_byte(hwif->pci_dev, 0x56 + 4 * channel + unit, conf); else { pci_write_config_byte(hwif->pci_dev, 0x56 + 4 * channel, conf); pci_write_config_byte(hwif->pci_dev, 0x56 + 4 * channel + 1, conf); } } /** * it821x_clock_strategy * @drive: drive to set up * * Select between the 50 and 66Mhz base clocks to get the best * results for this interface. */ static void it821x_clock_strategy(ide_drive_t *drive) { ide_hwif_t *hwif = drive->hwif; struct it821x_dev *itdev = ide_get_hwifdata(hwif); u8 unit = drive->select.b.unit; ide_drive_t *pair = &hwif->drives[1-unit]; int clock, altclock; u8 v; int sel = 0; if(itdev->want[0][0] > itdev->want[1][0]) { clock = itdev->want[0][1]; altclock = itdev->want[1][1]; } else { clock = itdev->want[1][1]; altclock = itdev->want[0][1]; } /* * if both clocks can be used for the mode with the higher priority * use the clock needed by the mode with the lower priority */ if (clock == ATA_ANY) clock = altclock; /* Nobody cares - keep the same clock */ if(clock == ATA_ANY) return; /* No change */ if(clock == itdev->clock_mode) return; /* Load this into the controller ? */ if(clock == ATA_66) itdev->clock_mode = ATA_66; else { itdev->clock_mode = ATA_50; sel = 1; } pci_read_config_byte(hwif->pci_dev, 0x50, &v); v &= ~(1 << (1 + hwif->channel)); v |= sel << (1 + hwif->channel); pci_write_config_byte(hwif->pci_dev, 0x50, v); /* * Reprogram the UDMA/PIO of the pair drive for the switch * MWDMA will be dealt with by the dma switcher */ if(pair && itdev->udma[1-unit] != UDMA_OFF) { it821x_program_udma(pair, itdev->udma[1-unit]); it821x_program(pair, itdev->pio[1-unit]); } /* * Reprogram the UDMA/PIO of our drive for the switch. * MWDMA will be dealt with by the dma switcher */ if(itdev->udma[unit] != UDMA_OFF) { it821x_program_udma(drive, itdev->udma[unit]); it821x_program(drive, itdev->pio[unit]); } } /** * it821x_tunepio - tune a drive * @drive: drive to tune * @pio: the desired PIO mode * * Try to tune the drive/host to the desired PIO mode taking into * the consideration the maximum PIO mode supported by the other * device on the cable. */ static int it821x_tunepio(ide_drive_t *drive, u8 set_pio) { ide_hwif_t *hwif = drive->hwif; struct it821x_dev *itdev = ide_get_hwifdata(hwif); int unit = drive->select.b.unit; ide_drive_t *pair = &hwif->drives[1 - unit]; /* Spec says 89 ref driver uses 88 */ static u16 pio[] = { 0xAA88, 0xA382, 0xA181, 0x3332, 0x3121 }; static u8 pio_want[] = { ATA_66, ATA_66, ATA_66, ATA_66, ATA_ANY }; /* * Compute the best PIO mode we can for a given device. We must * pick a speed that does not cause problems with the other device * on the cable. */ if (pair) { u8 pair_pio = ide_get_best_pio_mode(pair, 255, 4, NULL); /* trim PIO to the slowest of the master/slave */ if (pair_pio < set_pio) set_pio = pair_pio; } if (itdev->smart) return 0; /* We prefer 66Mhz clock for PIO 0-3, don't care for PIO4 */ itdev->want[unit][1] = pio_want[set_pio]; itdev->want[unit][0] = 1; /* PIO is lowest priority */ itdev->pio[unit] = pio[set_pio]; it821x_clock_strategy(drive); it821x_program(drive, itdev->pio[unit]); return ide_config_drive_speed(drive, XFER_PIO_0 + set_pio); } static void it821x_tuneproc(ide_drive_t *drive, u8 pio) { pio = ide_get_best_pio_mode(drive, pio, 4, NULL); (void)it821x_tunepio(drive, pio); } /** * it821x_tune_mwdma - tune a channel for MWDMA * @drive: drive to set up * @mode_wanted: the target operating mode * * Load the timing settings for this device mode into the * controller when doing MWDMA in pass through mode. The caller * must manage the whole lack of per device MWDMA/PIO timings and * the shared MWDMA/PIO timing register. */ static void it821x_tune_mwdma (ide_drive_t *drive, byte mode_wanted) { ide_hwif_t *hwif = drive->hwif; struct it821x_dev *itdev = (void *)ide_get_hwifdata(hwif); int unit = drive->select.b.unit; int channel = hwif->channel; u8 conf; static u16 dma[] = { 0x8866, 0x3222, 0x3121 }; static u8 mwdma_want[] = { ATA_ANY, ATA_66, ATA_ANY }; itdev->want[unit][1] = mwdma_want[mode_wanted]; itdev->want[unit][0] = 2; /* MWDMA is low priority */ itdev->mwdma[unit] = dma[mode_wanted]; itdev->udma[unit] = UDMA_OFF; /* UDMA bits off - Revision 0x10 do them in pairs */ pci_read_config_byte(hwif->pci_dev, 0x50, &conf); if(itdev->timing10) conf |= channel ? 0x60: 0x18; else conf |= 1 << (3 + 2 * channel + unit); pci_write_config_byte(hwif->pci_dev, 0x50, conf); it821x_clock_strategy(drive); /* FIXME: do we need to program this ? */ /* it821x_program(drive, itdev->mwdma[unit]); */ } /** * it821x_tune_udma - tune a channel for UDMA * @drive: drive to set up * @mode_wanted: the target operating mode * * Load the timing settings for this device mode into the * controller when doing UDMA modes in pass through. */ static void it821x_tune_udma (ide_drive_t *drive, byte mode_wanted) { ide_hwif_t *hwif = drive->hwif; struct it821x_dev *itdev = ide_get_hwifdata(hwif); int unit = drive->select.b.unit; int channel = hwif->channel; u8 conf; static u16 udma[] = { 0x4433, 0x4231, 0x3121, 0x2121, 0x1111, 0x2211, 0x1111 }; static u8 udma_want[] = { ATA_ANY, ATA_50, ATA_ANY, ATA_66, ATA_66, ATA_50, ATA_66 }; itdev->want[unit][1] = udma_want[mode_wanted]; itdev->want[unit][0] = 3; /* UDMA is high priority */ itdev->mwdma[unit] = MWDMA_OFF; itdev->udma[unit] = udma[mode_wanted]; if(mode_wanted >= 5) itdev->udma[unit] |= 0x8080; /* UDMA 5/6 select on */ /* UDMA on. Again revision 0x10 must do the pair */ pci_read_config_byte(hwif->pci_dev, 0x50, &conf); if(itdev->timing10) conf &= channel ? 0x9F: 0xE7; else conf &= ~ (1 << (3 + 2 * channel + unit)); pci_write_config_byte(hwif->pci_dev, 0x50, conf); it821x_clock_strategy(drive); it821x_program_udma(drive, itdev->udma[unit]); } /** * it821x_dma_read - DMA hook * @drive: drive for DMA * * The IT821x has a single timing register for MWDMA and for PIO * operations. As we flip back and forth we have to reload the * clock. In addition the rev 0x10 device only works if the same * timing value is loaded into the master and slave UDMA clock * so we must also reload that. * * FIXME: we could figure out in advance if we need to do reloads */ static void it821x_dma_start(ide_drive_t *drive) { ide_hwif_t *hwif = drive->hwif; struct it821x_dev *itdev = ide_get_hwifdata(hwif); int unit = drive->select.b.unit; if(itdev->mwdma[unit] != MWDMA_OFF) it821x_program(drive, itdev->mwdma[unit]); else if(itdev->udma[unit] != UDMA_OFF && itdev->timing10) it821x_program_udma(drive, itdev->udma[unit]); ide_dma_start(drive); } /** * it821x_dma_write - DMA hook * @drive: drive for DMA stop * * The IT821x has a single timing register for MWDMA and for PIO * operations. As we flip back and forth we have to reload the * clock. */ static int it821x_dma_end(ide_drive_t *drive) { ide_hwif_t *hwif = drive->hwif; int unit = drive->select.b.unit; struct it821x_dev *itdev = ide_get_hwifdata(hwif); int ret = __ide_dma_end(drive); if(itdev->mwdma[unit] != MWDMA_OFF) it821x_program(drive, itdev->pio[unit]); return ret; } /** * it821x_tune_chipset - set controller timings * @drive: Drive to set up * @xferspeed: speed we want to achieve * * Tune the ITE chipset for the desired mode. If we can't achieve * the desired mode then tune for a lower one, but ultimately * make the thing work. */ static int it821x_tune_chipset (ide_drive_t *drive, byte xferspeed) { ide_hwif_t *hwif = drive->hwif; struct it821x_dev *itdev = ide_get_hwifdata(hwif); u8 speed = ide_rate_filter(drive, xferspeed); switch (speed) { case XFER_PIO_4: case XFER_PIO_3: case XFER_PIO_2: case XFER_PIO_1: case XFER_PIO_0: return it821x_tunepio(drive, speed - XFER_PIO_0); } if (itdev->smart == 0) { switch (speed) { /* MWDMA tuning is really hard because our MWDMA and PIO timings are kept in the same place. We can switch in the host dma on/off callbacks */ case XFER_MW_DMA_2: case XFER_MW_DMA_1: case XFER_MW_DMA_0: it821x_tune_mwdma(drive, (speed - XFER_MW_DMA_0)); break; case XFER_UDMA_6: case XFER_UDMA_5: case XFER_UDMA_4: case XFER_UDMA_3: case XFER_UDMA_2: case XFER_UDMA_1: case XFER_UDMA_0: it821x_tune_udma(drive, (speed - XFER_UDMA_0)); break; default: return 1; } return ide_config_drive_speed(drive, speed); } /* don't touch anything in the smart mode */ return 0; } /** * it821x_configure_drive_for_dma - set up for DMA transfers * @drive: drive we are going to set up * * Set up the drive for DMA, tune the controller and drive as * required. If the drive isn't suitable for DMA or we hit * other problems then we will drop down to PIO and set up * PIO appropriately */ static int it821x_config_drive_for_dma (ide_drive_t *drive) { if (ide_tune_dma(drive)) return 0; it821x_tuneproc(drive, 255); return -1; } /** * ata66_it821x - check for 80 pin cable * @hwif: interface to check * * Check for the presence of an ATA66 capable cable on the * interface. Problematic as it seems some cards don't have * the needed logic onboard. */ static unsigned int __devinit ata66_it821x(ide_hwif_t *hwif) { /* The reference driver also only does disk side */ return 1; } /** * it821x_fixup - post init callback * @hwif: interface * * This callback is run after the drives have been probed but * before anything gets attached. It allows drivers to do any * final tuning that is needed, or fixups to work around bugs. */ static void __devinit it821x_fixups(ide_hwif_t *hwif) { struct it821x_dev *itdev = ide_get_hwifdata(hwif); int i; if(!itdev->smart) { /* * If we are in pass through mode then not much * needs to be done, but we do bother to clear the * IRQ mask as we may well be in PIO (eg rev 0x10) * for now and we know unmasking is safe on this chipset. */ for (i = 0; i < 2; i++) { ide_drive_t *drive = &hwif->drives[i]; if(drive->present) drive->unmask = 1; } return; } /* * Perform fixups on smart mode. We need to "lose" some * capabilities the firmware lacks but does not filter, and * also patch up some capability bits that it forgets to set * in RAID mode. */ for(i = 0; i < 2; i++) { ide_drive_t *drive = &hwif->drives[i]; struct hd_driveid *id; u16 *idbits; if(!drive->present) continue; id = drive->id; idbits = (u16 *)drive->id; /* Check for RAID v native */ if(strstr(id->model, "Integrated Technology Express")) { /* In raid mode the ident block is slightly buggy We need to set the bits so that the IDE layer knows LBA28. LBA48 and DMA ar valid */ id->capability |= 3; /* LBA28, DMA */ id->command_set_2 |= 0x0400; /* LBA48 valid */ id->cfs_enable_2 |= 0x0400; /* LBA48 on */ /* Reporting logic */ printk(KERN_INFO "%s: IT8212 %sRAID %d volume", drive->name, idbits[147] ? "Bootable ":"", idbits[129]); if(idbits[129] != 1) printk("(%dK stripe)", idbits[146]); printk(".\n"); } else { /* Non RAID volume. Fixups to stop the core code doing unsupported things */ id->field_valid &= 3; id->queue_depth = 0; id->command_set_1 = 0; id->command_set_2 &= 0xC400; id->cfsse &= 0xC000; id->cfs_enable_1 = 0; id->cfs_enable_2 &= 0xC400; id->csf_default &= 0xC000; id->word127 = 0; id->dlf = 0; id->csfo = 0; id->cfa_power = 0; printk(KERN_INFO "%s: Performing identify fixups.\n", drive->name); } /* * Set MWDMA0 mode as enabled/support - just to tell * IDE core that DMA is supported (it821x hardware * takes care of DMA mode programming). */ if (id->capability & 1) { id->dma_mword |= 0x0101; drive->current_speed = XFER_MW_DMA_0; } } } /** * init_hwif_it821x - set up hwif structs * @hwif: interface to set up * * We do the basic set up of the interface structure. The IT8212 * requires several custom handlers so we override the default * ide DMA handlers appropriately */ static void __devinit init_hwif_it821x(ide_hwif_t *hwif) { struct it821x_dev *idev = kzalloc(sizeof(struct it821x_dev), GFP_KERNEL); u8 conf; if(idev == NULL) { printk(KERN_ERR "it821x: out of memory, falling back to legacy behaviour.\n"); goto fallback; } ide_set_hwifdata(hwif, idev); hwif->atapi_dma = 1; pci_read_config_byte(hwif->pci_dev, 0x50, &conf); if(conf & 1) { idev->smart = 1; hwif->atapi_dma = 0; /* Long I/O's although allowed in LBA48 space cause the onboard firmware to enter the twighlight zone */ hwif->rqsize = 256; } /* Pull the current clocks from 0x50 also */ if (conf & (1 << (1 + hwif->channel))) idev->clock_mode = ATA_50; else idev->clock_mode = ATA_66; idev->want[0][1] = ATA_ANY; idev->want[1][1] = ATA_ANY; /* * Not in the docs but according to the reference driver * this is neccessary. */ pci_read_config_byte(hwif->pci_dev, 0x08, &conf); if(conf == 0x10) { idev->timing10 = 1; hwif->atapi_dma = 0; if(!idev->smart) printk(KERN_WARNING "it821x: Revision 0x10, workarounds activated.\n"); } hwif->speedproc = &it821x_tune_chipset; hwif->tuneproc = &it821x_tuneproc; /* MWDMA/PIO clock switching for pass through mode */ if(!idev->smart) { hwif->dma_start = &it821x_dma_start; hwif->ide_dma_end = &it821x_dma_end; } hwif->drives[0].autotune = 1; hwif->drives[1].autotune = 1; if (!hwif->dma_base) goto fallback; hwif->ultra_mask = 0x7f; hwif->mwdma_mask = 0x07; hwif->ide_dma_check = &it821x_config_drive_for_dma; if (!(hwif->udma_four)) hwif->udma_four = ata66_it821x(hwif); /* * The BIOS often doesn't set up DMA on this controller * so we always do it. */ hwif->autodma = 1; hwif->drives[0].autodma = hwif->autodma; hwif->drives[1].autodma = hwif->autodma; return; fallback: hwif->autodma = 0; return; } static void __devinit it8212_disable_raid(struct pci_dev *dev) { /* Reset local CPU, and set BIOS not ready */ pci_write_config_byte(dev, 0x5E, 0x01); /* Set to bypass mode, and reset PCI bus */ pci_write_config_byte(dev, 0x50, 0x00); pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_PARITY | PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); pci_write_config_word(dev, 0x40, 0xA0F3); pci_write_config_dword(dev,0x4C, 0x02040204); pci_write_config_byte(dev, 0x42, 0x36); pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0x20); } static unsigned int __devinit init_chipset_it821x(struct pci_dev *dev, const char *name) { u8 conf; static char *mode[2] = { "pass through", "smart" }; /* Force the card into bypass mode if so requested */ if (it8212_noraid) { printk(KERN_INFO "it8212: forcing bypass mode.\n"); it8212_disable_raid(dev); } pci_read_config_byte(dev, 0x50, &conf); printk(KERN_INFO "it821x: controller in %s mode.\n", mode[conf & 1]); return 0; } #define DECLARE_ITE_DEV(name_str) \ { \ .name = name_str, \ .init_chipset = init_chipset_it821x, \ .init_hwif = init_hwif_it821x, \ .channels = 2, \ .autodma = AUTODMA, \ .bootable = ON_BOARD, \ .fixup = it821x_fixups \ } static ide_pci_device_t it821x_chipsets[] __devinitdata = { /* 0 */ DECLARE_ITE_DEV("IT8212"), }; /** * it821x_init_one - pci layer discovery entry * @dev: PCI device * @id: ident table entry * * Called by the PCI code when it finds an ITE821x controller. * We then use the IDE PCI generic helper to do most of the work. */ static int __devinit it821x_init_one(struct pci_dev *dev, const struct pci_device_id *id) { ide_setup_pci_device(dev, &it821x_chipsets[id->driver_data]); return 0; } static struct pci_device_id it821x_pci_tbl[] = { { PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_8211, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, { PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_8212, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, { 0, }, }; MODULE_DEVICE_TABLE(pci, it821x_pci_tbl); static struct pci_driver driver = { .name = "ITE821x IDE", .id_table = it821x_pci_tbl, .probe = it821x_init_one, }; static int __init it821x_ide_init(void) { return ide_pci_register_driver(&driver); } module_init(it821x_ide_init); module_param_named(noraid, it8212_noraid, int, S_IRUGO); MODULE_PARM_DESC(it8212_noraid, "Force card into bypass mode"); MODULE_AUTHOR("Alan Cox"); MODULE_DESCRIPTION("PCI driver module for the ITE 821x"); MODULE_LICENSE("GPL");
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