/* * pata_via.c - VIA PATA for new ATA layer * (C) 2005-2006 Red Hat Inc * Alan Cox <alan@redhat.com> * * Documentation * Most chipset documentation available under NDA only * * VIA version guide * VIA VT82C561 - early design, uses ata_generic currently * VIA VT82C576 - MWDMA, 33Mhz * VIA VT82C586 - MWDMA, 33Mhz * VIA VT82C586a - Added UDMA to 33Mhz * VIA VT82C586b - UDMA33 * VIA VT82C596a - Nonfunctional UDMA66 * VIA VT82C596b - Working UDMA66 * VIA VT82C686 - Nonfunctional UDMA66 * VIA VT82C686a - Working UDMA66 * VIA VT82C686b - Updated to UDMA100 * VIA VT8231 - UDMA100 * VIA VT8233 - UDMA100 * VIA VT8233a - UDMA133 * VIA VT8233c - UDMA100 * VIA VT8235 - UDMA133 * VIA VT8237 - UDMA133 * * Most registers remain compatible across chips. Others start reserved * and acquire sensible semantics if set to 1 (eg cable detect). A few * exceptions exist, notably around the FIFO settings. * * One additional quirk of the VIA design is that like ALi they use few * PCI IDs for a lot of chips. * * Based heavily on: * * Version 3.38 * * VIA IDE driver for Linux. Supported southbridges: * * vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b, * vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a, * vt8235, vt8237 * * Copyright (c) 2000-2002 Vojtech Pavlik * * Based on the work of: * Michel Aubry * Jeff Garzik * Andre Hedrick */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/init.h> #include <linux/blkdev.h> #include <linux/delay.h> #include <scsi/scsi_host.h> #include <linux/libata.h> #define DRV_NAME "pata_via" #define DRV_VERSION "0.1.14" /* * The following comes directly from Vojtech Pavlik's ide/pci/via82cxxx * driver. */ enum { VIA_UDMA = 0x007, VIA_UDMA_NONE = 0x000, VIA_UDMA_33 = 0x001, VIA_UDMA_66 = 0x002, VIA_UDMA_100 = 0x003, VIA_UDMA_133 = 0x004, VIA_BAD_PREQ = 0x010, /* Crashes if PREQ# till DDACK# set */ VIA_BAD_CLK66 = 0x020, /* 66 MHz clock doesn't work correctly */ VIA_SET_FIFO = 0x040, /* Needs to have FIFO split set */ VIA_NO_UNMASK = 0x080, /* Doesn't work with IRQ unmasking on */ VIA_BAD_ID = 0x100, /* Has wrong vendor ID (0x1107) */ VIA_BAD_AST = 0x200, /* Don't touch Address Setup Timing */ VIA_NO_ENABLES = 0x400, /* Has no enablebits */ }; /* * VIA SouthBridge chips. */ static const struct via_isa_bridge { const char *name; u16 id; u8 rev_min; u8 rev_max; u16 flags; } via_isa_bridges[] = { { "cx700", PCI_DEVICE_ID_VIA_CX700, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST }, { "vt6410", PCI_DEVICE_ID_VIA_6410, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_NO_ENABLES}, { "vt8237a", PCI_DEVICE_ID_VIA_8237A, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST }, { "vt8237", PCI_DEVICE_ID_VIA_8237, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST }, { "vt8235", PCI_DEVICE_ID_VIA_8235, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST }, { "vt8233a", PCI_DEVICE_ID_VIA_8233A, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST }, { "vt8233c", PCI_DEVICE_ID_VIA_8233C_0, 0x00, 0x2f, VIA_UDMA_100 }, { "vt8233", PCI_DEVICE_ID_VIA_8233_0, 0x00, 0x2f, VIA_UDMA_100 }, { "vt8231", PCI_DEVICE_ID_VIA_8231, 0x00, 0x2f, VIA_UDMA_100 }, { "vt82c686b", PCI_DEVICE_ID_VIA_82C686, 0x40, 0x4f, VIA_UDMA_100 }, { "vt82c686a", PCI_DEVICE_ID_VIA_82C686, 0x10, 0x2f, VIA_UDMA_66 }, { "vt82c686", PCI_DEVICE_ID_VIA_82C686, 0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 }, { "vt82c596b", PCI_DEVICE_ID_VIA_82C596, 0x10, 0x2f, VIA_UDMA_66 }, { "vt82c596a", PCI_DEVICE_ID_VIA_82C596, 0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 }, { "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO }, { "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ }, { "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO }, { "vt82c586a", PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO }, { "vt82c586", PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO }, { "vt82c576", PCI_DEVICE_ID_VIA_82C576, 0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK }, { "vt82c576", PCI_DEVICE_ID_VIA_82C576, 0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID }, { NULL } }; /** * via_cable_detect - cable detection * @ap: ATA port * * Perform cable detection. Actually for the VIA case the BIOS * already did this for us. We read the values provided by the * BIOS. If you are using an 8235 in a non-PC configuration you * may need to update this code. * * Hotplug also impacts on this. */ static int via_cable_detect(struct ata_port *ap) { struct pci_dev *pdev = to_pci_dev(ap->host->dev); u32 ata66; pci_read_config_dword(pdev, 0x50, &ata66); /* Check both the drive cable reporting bits, we might not have two drives */ if (ata66 & (0x10100000 >> (16 * ap->port_no))) return ATA_CBL_PATA80; else return ATA_CBL_PATA40; } static int via_pre_reset(struct ata_port *ap) { const struct via_isa_bridge *config = ap->host->private_data; if (!(config->flags & VIA_NO_ENABLES)) { static const struct pci_bits via_enable_bits[] = { { 0x40, 1, 0x02, 0x02 }, { 0x40, 1, 0x01, 0x01 } }; struct pci_dev *pdev = to_pci_dev(ap->host->dev); if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no])) return -ENOENT; } if ((config->flags & VIA_UDMA) >= VIA_UDMA_66) ap->cbl = via_cable_detect(ap); else ap->cbl = ATA_CBL_PATA40; return ata_std_prereset(ap); } /** * via_error_handler - reset for VIA chips * @ap: ATA port * * Handle the reset callback for the later chips with cable detect */ static void via_error_handler(struct ata_port *ap) { ata_bmdma_drive_eh(ap, via_pre_reset, ata_std_softreset, NULL, ata_std_postreset); } /** * via_do_set_mode - set initial PIO mode data * @ap: ATA interface * @adev: ATA device * @mode: ATA mode being programmed * @tdiv: Clocks per PCI clock * @set_ast: Set to program address setup * @udma_type: UDMA mode/format of registers * * Program the VIA registers for DMA and PIO modes. Uses the ata timing * support in order to compute modes. * * FIXME: Hotplug will require we serialize multiple mode changes * on the two channels. */ static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mode, int tdiv, int set_ast, int udma_type) { struct pci_dev *pdev = to_pci_dev(ap->host->dev); struct ata_device *peer = ata_dev_pair(adev); struct ata_timing t, p; static int via_clock = 33333; /* Bus clock in kHZ - ought to be tunable one day */ unsigned long T = 1000000000 / via_clock; unsigned long UT = T/tdiv; int ut; int offset = 3 - (2*ap->port_no) - adev->devno; /* Calculate the timing values we require */ ata_timing_compute(adev, mode, &t, T, UT); /* We share 8bit timing so we must merge the constraints */ if (peer) { if (peer->pio_mode) { ata_timing_compute(peer, peer->pio_mode, &p, T, UT); ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT); } } /* Address setup is programmable but breaks on UDMA133 setups */ if (set_ast) { u8 setup; /* 2 bits per drive */ int shift = 2 * offset; pci_read_config_byte(pdev, 0x4C, &setup); setup &= ~(3 << shift); setup |= FIT(t.setup, 1, 4) << shift; /* 1,4 or 1,4 - 1 FIXME */ pci_write_config_byte(pdev, 0x4C, setup); } /* Load the PIO mode bits */ pci_write_config_byte(pdev, 0x4F - ap->port_no, ((FIT(t.act8b, 1, 16) - 1) << 4) | (FIT(t.rec8b, 1, 16) - 1)); pci_write_config_byte(pdev, 0x48 + offset, ((FIT(t.active, 1, 16) - 1) << 4) | (FIT(t.recover, 1, 16) - 1)); /* Load the UDMA bits according to type */ switch(udma_type) { default: /* BUG() ? */ /* fall through */ case 33: ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 5) - 2)) : 0x03; break; case 66: ut = t.udma ? (0xe8 | (FIT(t.udma, 2, 9) - 2)) : 0x0f; break; case 100: ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07; break; case 133: ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07; break; } /* Set UDMA unless device is not UDMA capable */ if (udma_type) pci_write_config_byte(pdev, 0x50 + offset, ut); } static void via_set_piomode(struct ata_port *ap, struct ata_device *adev) { const struct via_isa_bridge *config = ap->host->private_data; int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1; int mode = config->flags & VIA_UDMA; static u8 tclock[5] = { 1, 1, 2, 3, 4 }; static u8 udma[5] = { 0, 33, 66, 100, 133 }; via_do_set_mode(ap, adev, adev->pio_mode, tclock[mode], set_ast, udma[mode]); } static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev) { const struct via_isa_bridge *config = ap->host->private_data; int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1; int mode = config->flags & VIA_UDMA; static u8 tclock[5] = { 1, 1, 2, 3, 4 }; static u8 udma[5] = { 0, 33, 66, 100, 133 }; via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]); } static struct scsi_host_template via_sht = { .module = THIS_MODULE, .name = DRV_NAME, .ioctl = ata_scsi_ioctl, .queuecommand = ata_scsi_queuecmd, .can_queue = ATA_DEF_QUEUE, .this_id = ATA_SHT_THIS_ID, .sg_tablesize = LIBATA_MAX_PRD, .max_sectors = ATA_MAX_SECTORS, .cmd_per_lun = ATA_SHT_CMD_PER_LUN, .emulated = ATA_SHT_EMULATED, .use_clustering = ATA_SHT_USE_CLUSTERING, .proc_name = DRV_NAME, .dma_boundary = ATA_DMA_BOUNDARY, .slave_configure = ata_scsi_slave_config, .slave_destroy = ata_scsi_slave_destroy, .bios_param = ata_std_bios_param, }; static struct ata_port_operations via_port_ops = { .port_disable = ata_port_disable, .set_piomode = via_set_piomode, .set_dmamode = via_set_dmamode, .mode_filter = ata_pci_default_filter, .tf_load = ata_tf_load, .tf_read = ata_tf_read, .check_status = ata_check_status, .exec_command = ata_exec_command, .dev_select = ata_std_dev_select, .freeze = ata_bmdma_freeze, .thaw = ata_bmdma_thaw, .error_handler = via_error_handler, .post_internal_cmd = ata_bmdma_post_internal_cmd, .bmdma_setup = ata_bmdma_setup, .bmdma_start = ata_bmdma_start, .bmdma_stop = ata_bmdma_stop, .bmdma_status = ata_bmdma_status, .qc_prep = ata_qc_prep, .qc_issue = ata_qc_issue_prot, .data_xfer = ata_pio_data_xfer, .irq_handler = ata_interrupt, .irq_clear = ata_bmdma_irq_clear, .port_start = ata_port_start, .port_stop = ata_port_stop, .host_stop = ata_host_stop }; static struct ata_port_operations via_port_ops_noirq = { .port_disable = ata_port_disable, .set_piomode = via_set_piomode, .set_dmamode = via_set_dmamode, .mode_filter = ata_pci_default_filter, .tf_load = ata_tf_load, .tf_read = ata_tf_read, .check_status = ata_check_status, .exec_command = ata_exec_command, .dev_select = ata_std_dev_select, .freeze = ata_bmdma_freeze, .thaw = ata_bmdma_thaw, .error_handler = via_error_handler, .post_internal_cmd = ata_bmdma_post_internal_cmd, .bmdma_setup = ata_bmdma_setup, .bmdma_start = ata_bmdma_start, .bmdma_stop = ata_bmdma_stop, .bmdma_status = ata_bmdma_status, .qc_prep = ata_qc_prep, .qc_issue = ata_qc_issue_prot, .data_xfer = ata_pio_data_xfer_noirq, .irq_handler = ata_interrupt, .irq_clear = ata_bmdma_irq_clear, .port_start = ata_port_start, .port_stop = ata_port_stop, .host_stop = ata_host_stop }; /** * via_init_one - discovery callback * @pdev: PCI device ID * @id: PCI table info * * A VIA IDE interface has been discovered. Figure out what revision * and perform configuration work before handing it to the ATA layer */ static int via_init_one(struct pci_dev *pdev, const struct pci_device_id *id) { /* Early VIA without UDMA support */ static struct ata_port_info via_mwdma_info = { .sht = &via_sht, .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, .pio_mask = 0x1f, .mwdma_mask = 0x07, .port_ops = &via_port_ops }; /* Ditto with IRQ masking required */ static struct ata_port_info via_mwdma_info_borked = { .sht = &via_sht, .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, .pio_mask = 0x1f, .mwdma_mask = 0x07, .port_ops = &via_port_ops_noirq, }; /* VIA UDMA 33 devices (and borked 66) */ static struct ata_port_info via_udma33_info = { .sht = &via_sht, .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, .pio_mask = 0x1f, .mwdma_mask = 0x07, .udma_mask = 0x7, .port_ops = &via_port_ops }; /* VIA UDMA 66 devices */ static struct ata_port_info via_udma66_info = { .sht = &via_sht, .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, .pio_mask = 0x1f, .mwdma_mask = 0x07, .udma_mask = 0x1f, .port_ops = &via_port_ops }; /* VIA UDMA 100 devices */ static struct ata_port_info via_udma100_info = { .sht = &via_sht, .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, .pio_mask = 0x1f, .mwdma_mask = 0x07, .udma_mask = 0x3f, .port_ops = &via_port_ops }; /* UDMA133 with bad AST (All current 133) */ static struct ata_port_info via_udma133_info = { .sht = &via_sht, .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, .pio_mask = 0x1f, .mwdma_mask = 0x07, .udma_mask = 0x7f, /* FIXME: should check north bridge */ .port_ops = &via_port_ops }; struct ata_port_info *port_info[2], *type; struct pci_dev *isa = NULL; const struct via_isa_bridge *config; static int printed_version; u8 t; u8 enable; u32 timing; if (!printed_version++) dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n"); /* To find out how the IDE will behave and what features we actually have to look at the bridge not the IDE controller */ for (config = via_isa_bridges; config->id; config++) if ((isa = pci_get_device(PCI_VENDOR_ID_VIA + !!(config->flags & VIA_BAD_ID), config->id, NULL))) { pci_read_config_byte(isa, PCI_REVISION_ID, &t); if (t >= config->rev_min && t <= config->rev_max) break; pci_dev_put(isa); } if (!config->id) { printk(KERN_WARNING "via: Unknown VIA SouthBridge, disabling.\n"); return -ENODEV; } pci_dev_put(isa); /* 0x40 low bits indicate enabled channels */ pci_read_config_byte(pdev, 0x40 , &enable); enable &= 3; if (enable == 0) { return -ENODEV; } /* Initialise the FIFO for the enabled channels. */ if (config->flags & VIA_SET_FIFO) { u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20}; u8 fifo; pci_read_config_byte(pdev, 0x43, &fifo); /* Clear PREQ# until DDACK# for errata */ if (config->flags & VIA_BAD_PREQ) fifo &= 0x7F; else fifo &= 0x9f; /* Turn on FIFO for enabled channels */ fifo |= fifo_setting[enable]; pci_write_config_byte(pdev, 0x43, fifo); } /* Clock set up */ switch(config->flags & VIA_UDMA) { case VIA_UDMA_NONE: if (config->flags & VIA_NO_UNMASK) type = &via_mwdma_info_borked; else type = &via_mwdma_info; break; case VIA_UDMA_33: type = &via_udma33_info; break; case VIA_UDMA_66: type = &via_udma66_info; /* The 66 MHz devices require we enable the clock */ pci_read_config_dword(pdev, 0x50, &timing); timing |= 0x80008; pci_write_config_dword(pdev, 0x50, timing); break; case VIA_UDMA_100: type = &via_udma100_info; break; case VIA_UDMA_133: type = &via_udma133_info; break; default: WARN_ON(1); return -ENODEV; } if (config->flags & VIA_BAD_CLK66) { /* Disable the 66MHz clock on problem devices */ pci_read_config_dword(pdev, 0x50, &timing); timing &= ~0x80008; pci_write_config_dword(pdev, 0x50, timing); } /* We have established the device type, now fire it up */ type->private_data = (void *)config; port_info[0] = port_info[1] = type; return ata_pci_init_one(pdev, port_info, 2); } static const struct pci_device_id via[] = { { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C576_1), }, { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C586_1), }, { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_6410), }, { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_SATA_EIDE), }, { }, }; static struct pci_driver via_pci_driver = { .name = DRV_NAME, .id_table = via, .probe = via_init_one, .remove = ata_pci_remove_one }; static int __init via_init(void) { return pci_register_driver(&via_pci_driver); } static void __exit via_exit(void) { pci_unregister_driver(&via_pci_driver); } MODULE_AUTHOR("Alan Cox"); MODULE_DESCRIPTION("low-level driver for VIA PATA"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pci, via); MODULE_VERSION(DRV_VERSION); module_init(via_init); module_exit(via_exit);