| /* |
| * pata_cmd640.c - CMD640 PCI PATA for new ATA layer |
| * (C) 2007 Red Hat Inc |
| * Alan Cox <alan@redhat.com> |
| * |
| * Based upon |
| * linux/drivers/ide/pci/cmd640.c Version 1.02 Sep 01, 1996 |
| * |
| * Copyright (C) 1995-1996 Linus Torvalds & authors (see driver) |
| * |
| * This drives only the PCI version of the controller. If you have a |
| * VLB one then we have enough docs to support it but you can write |
| * your own code. |
| */ |
| |
| #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_cmd640" |
| #define DRV_VERSION "0.0.5" |
| |
| struct cmd640_reg { |
| int last; |
| u8 reg58[ATA_MAX_DEVICES]; |
| }; |
| |
| enum { |
| CFR = 0x50, |
| CNTRL = 0x51, |
| CMDTIM = 0x52, |
| ARTIM0 = 0x53, |
| DRWTIM0 = 0x54, |
| ARTIM23 = 0x57, |
| DRWTIM23 = 0x58, |
| BRST = 0x59 |
| }; |
| |
| /** |
| * cmd640_set_piomode - set initial PIO mode data |
| * @ap: ATA port |
| * @adev: ATA device |
| * |
| * Called to do the PIO mode setup. |
| */ |
| |
| static void cmd640_set_piomode(struct ata_port *ap, struct ata_device *adev) |
| { |
| struct cmd640_reg *timing = ap->private_data; |
| struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
| struct ata_timing t; |
| const unsigned long T = 1000000 / 33; |
| const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 }; |
| u8 reg; |
| int arttim = ARTIM0 + 2 * adev->devno; |
| struct ata_device *pair = ata_dev_pair(adev); |
| |
| if (ata_timing_compute(adev, adev->pio_mode, &t, T, 0) < 0) { |
| printk(KERN_ERR DRV_NAME ": mode computation failed.\n"); |
| return; |
| } |
| |
| /* The second channel has shared timings and the setup timing is |
| messy to switch to merge it for worst case */ |
| if (ap->port_no && pair) { |
| struct ata_timing p; |
| ata_timing_compute(pair, pair->pio_mode, &p, T, 1); |
| ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP); |
| } |
| |
| /* Make the timings fit */ |
| if (t.recover > 16) { |
| t.active += t.recover - 16; |
| t.recover = 16; |
| } |
| if (t.active > 16) |
| t.active = 16; |
| |
| /* Now convert the clocks into values we can actually stuff into |
| the chip */ |
| |
| if (t.recover > 1) |
| t.recover--; /* 640B only */ |
| else |
| t.recover = 15; |
| |
| if (t.setup > 4) |
| t.setup = 0xC0; |
| else |
| t.setup = setup_data[t.setup]; |
| |
| if (ap->port_no == 0) { |
| t.active &= 0x0F; /* 0 = 16 */ |
| |
| /* Load setup timing */ |
| pci_read_config_byte(pdev, arttim, ®); |
| reg &= 0x3F; |
| reg |= t.setup; |
| pci_write_config_byte(pdev, arttim, reg); |
| |
| /* Load active/recovery */ |
| pci_write_config_byte(pdev, arttim + 1, (t.active << 4) | t.recover); |
| } else { |
| /* Save the shared timings for channel, they will be loaded |
| by qc_issue_prot. Reloading the setup time is expensive |
| so we keep a merged one loaded */ |
| pci_read_config_byte(pdev, ARTIM23, ®); |
| reg &= 0x3F; |
| reg |= t.setup; |
| pci_write_config_byte(pdev, ARTIM23, reg); |
| timing->reg58[adev->devno] = (t.active << 4) | t.recover; |
| } |
| } |
| |
| |
| /** |
| * cmd640_qc_issue_prot - command preparation hook |
| * @qc: Command to be issued |
| * |
| * Channel 1 has shared timings. We must reprogram the |
| * clock each drive 2/3 switch we do. |
| */ |
| |
| static unsigned int cmd640_qc_issue_prot(struct ata_queued_cmd *qc) |
| { |
| struct ata_port *ap = qc->ap; |
| struct ata_device *adev = qc->dev; |
| struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
| struct cmd640_reg *timing = ap->private_data; |
| |
| if (ap->port_no != 0 && adev->devno != timing->last) { |
| pci_write_config_byte(pdev, DRWTIM23, timing->reg58[adev->devno]); |
| timing->last = adev->devno; |
| } |
| return ata_qc_issue_prot(qc); |
| } |
| |
| /** |
| * cmd640_port_start - port setup |
| * @ap: ATA port being set up |
| * |
| * The CMD640 needs to maintain private data structures so we |
| * allocate space here. |
| */ |
| |
| static int cmd640_port_start(struct ata_port *ap) |
| { |
| struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
| struct cmd640_reg *timing; |
| |
| int ret = ata_port_start(ap); |
| if (ret < 0) |
| return ret; |
| |
| timing = devm_kzalloc(&pdev->dev, sizeof(struct cmd640_reg), GFP_KERNEL); |
| if (timing == NULL) |
| return -ENOMEM; |
| timing->last = -1; /* Force a load */ |
| ap->private_data = timing; |
| return ret; |
| } |
| |
| static struct scsi_host_template cmd640_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, |
| .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 cmd640_port_ops = { |
| .set_piomode = cmd640_set_piomode, |
| .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 = ata_bmdma_error_handler, |
| .post_internal_cmd = ata_bmdma_post_internal_cmd, |
| .cable_detect = ata_cable_40wire, |
| |
| .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 = cmd640_qc_issue_prot, |
| |
| /* In theory this is not needed once we kill the prefetcher */ |
| .data_xfer = ata_data_xfer_noirq, |
| |
| .irq_handler = ata_interrupt, |
| .irq_clear = ata_bmdma_irq_clear, |
| .irq_on = ata_irq_on, |
| |
| .port_start = cmd640_port_start, |
| }; |
| |
| static void cmd640_hardware_init(struct pci_dev *pdev) |
| { |
| u8 r; |
| u8 ctrl; |
| |
| /* CMD640 detected, commiserations */ |
| pci_write_config_byte(pdev, 0x5B, 0x00); |
| /* Get version info */ |
| pci_read_config_byte(pdev, CFR, &r); |
| /* PIO0 command cycles */ |
| pci_write_config_byte(pdev, CMDTIM, 0); |
| /* 512 byte bursts (sector) */ |
| pci_write_config_byte(pdev, BRST, 0x40); |
| /* |
| * A reporter a long time ago |
| * Had problems with the data fifo |
| * So don't run the risk |
| * Of putting crap on the disk |
| * For its better just to go slow |
| */ |
| /* Do channel 0 */ |
| pci_read_config_byte(pdev, CNTRL, &ctrl); |
| pci_write_config_byte(pdev, CNTRL, ctrl | 0xC0); |
| /* Ditto for channel 1 */ |
| pci_read_config_byte(pdev, ARTIM23, &ctrl); |
| ctrl |= 0x0C; |
| pci_write_config_byte(pdev, ARTIM23, ctrl); |
| } |
| |
| static int cmd640_init_one(struct pci_dev *pdev, const struct pci_device_id *id) |
| { |
| static const struct ata_port_info info = { |
| .sht = &cmd640_sht, |
| .flags = ATA_FLAG_SLAVE_POSS, |
| .pio_mask = 0x1f, |
| .port_ops = &cmd640_port_ops |
| }; |
| const struct ata_port_info *ppi[] = { &info, NULL }; |
| |
| cmd640_hardware_init(pdev); |
| return ata_pci_init_one(pdev, ppi); |
| } |
| |
| static int cmd640_reinit_one(struct pci_dev *pdev) |
| { |
| cmd640_hardware_init(pdev); |
| #ifdef CONFIG_PM |
| return ata_pci_device_resume(pdev); |
| #else |
| return 0; |
| #endif |
| } |
| |
| static const struct pci_device_id cmd640[] = { |
| { PCI_VDEVICE(CMD, 0x640), 0 }, |
| { }, |
| }; |
| |
| static struct pci_driver cmd640_pci_driver = { |
| .name = DRV_NAME, |
| .id_table = cmd640, |
| .probe = cmd640_init_one, |
| .remove = ata_pci_remove_one, |
| #ifdef CONFIG_PM |
| .suspend = ata_pci_device_suspend, |
| #endif |
| .resume = cmd640_reinit_one, |
| }; |
| |
| static int __init cmd640_init(void) |
| { |
| return pci_register_driver(&cmd640_pci_driver); |
| } |
| |
| static void __exit cmd640_exit(void) |
| { |
| pci_unregister_driver(&cmd640_pci_driver); |
| } |
| |
| MODULE_AUTHOR("Alan Cox"); |
| MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers"); |
| MODULE_LICENSE("GPL"); |
| MODULE_DEVICE_TABLE(pci, cmd640); |
| MODULE_VERSION(DRV_VERSION); |
| |
| module_init(cmd640_init); |
| module_exit(cmd640_exit); |