Paul Mundt | a20c9e8 | 2006-10-27 19:08:48 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic platform device PATA driver |
| 3 | * |
| 4 | * Copyright (C) 2006 Paul Mundt |
| 5 | * |
| 6 | * Based on pata_pcmcia: |
| 7 | * |
| 8 | * Copyright 2005-2006 Red Hat Inc <alan@redhat.com>, all rights reserved. |
| 9 | * |
| 10 | * This file is subject to the terms and conditions of the GNU General Public |
| 11 | * License. See the file "COPYING" in the main directory of this archive |
| 12 | * for more details. |
| 13 | */ |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/blkdev.h> |
| 18 | #include <scsi/scsi_host.h> |
| 19 | #include <linux/ata.h> |
| 20 | #include <linux/libata.h> |
| 21 | #include <linux/platform_device.h> |
| 22 | #include <linux/pata_platform.h> |
| 23 | |
| 24 | #define DRV_NAME "pata_platform" |
| 25 | #define DRV_VERSION "0.1.2" |
| 26 | |
| 27 | static int pio_mask = 1; |
| 28 | |
| 29 | /* |
| 30 | * Provide our own set_mode() as we don't want to change anything that has |
| 31 | * already been configured.. |
| 32 | */ |
Al Viro | 161c888 | 2007-01-30 13:23:45 +0000 | [diff] [blame] | 33 | static int pata_platform_set_mode(struct ata_port *ap, struct ata_device **unused) |
Paul Mundt | a20c9e8 | 2006-10-27 19:08:48 -0700 | [diff] [blame] | 34 | { |
| 35 | int i; |
| 36 | |
| 37 | for (i = 0; i < ATA_MAX_DEVICES; i++) { |
| 38 | struct ata_device *dev = &ap->device[i]; |
| 39 | |
| 40 | if (ata_dev_enabled(dev)) { |
| 41 | /* We don't really care */ |
| 42 | dev->pio_mode = dev->xfer_mode = XFER_PIO_0; |
| 43 | dev->xfer_shift = ATA_SHIFT_PIO; |
| 44 | dev->flags |= ATA_DFLAG_PIO; |
| 45 | } |
| 46 | } |
Al Viro | 161c888 | 2007-01-30 13:23:45 +0000 | [diff] [blame] | 47 | return 0; |
Paul Mundt | a20c9e8 | 2006-10-27 19:08:48 -0700 | [diff] [blame] | 48 | } |
| 49 | |
| 50 | static void pata_platform_host_stop(struct ata_host *host) |
| 51 | { |
| 52 | int i; |
| 53 | |
| 54 | /* |
| 55 | * Unmap the bases for MMIO |
| 56 | */ |
| 57 | for (i = 0; i < host->n_ports; i++) { |
| 58 | struct ata_port *ap = host->ports[i]; |
| 59 | |
| 60 | if (ap->flags & ATA_FLAG_MMIO) { |
| 61 | iounmap((void __iomem *)ap->ioaddr.ctl_addr); |
| 62 | iounmap((void __iomem *)ap->ioaddr.cmd_addr); |
| 63 | } |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | static struct scsi_host_template pata_platform_sht = { |
| 68 | .module = THIS_MODULE, |
| 69 | .name = DRV_NAME, |
| 70 | .ioctl = ata_scsi_ioctl, |
| 71 | .queuecommand = ata_scsi_queuecmd, |
| 72 | .can_queue = ATA_DEF_QUEUE, |
| 73 | .this_id = ATA_SHT_THIS_ID, |
| 74 | .sg_tablesize = LIBATA_MAX_PRD, |
Paul Mundt | a20c9e8 | 2006-10-27 19:08:48 -0700 | [diff] [blame] | 75 | .cmd_per_lun = ATA_SHT_CMD_PER_LUN, |
| 76 | .emulated = ATA_SHT_EMULATED, |
| 77 | .use_clustering = ATA_SHT_USE_CLUSTERING, |
| 78 | .proc_name = DRV_NAME, |
| 79 | .dma_boundary = ATA_DMA_BOUNDARY, |
| 80 | .slave_configure = ata_scsi_slave_config, |
Tejun Heo | c972b60 | 2006-11-29 12:10:46 +0900 | [diff] [blame] | 81 | .slave_destroy = ata_scsi_slave_destroy, |
Paul Mundt | a20c9e8 | 2006-10-27 19:08:48 -0700 | [diff] [blame] | 82 | .bios_param = ata_std_bios_param, |
| 83 | }; |
| 84 | |
| 85 | static struct ata_port_operations pata_platform_port_ops = { |
| 86 | .set_mode = pata_platform_set_mode, |
| 87 | |
| 88 | .port_disable = ata_port_disable, |
| 89 | .tf_load = ata_tf_load, |
| 90 | .tf_read = ata_tf_read, |
| 91 | .check_status = ata_check_status, |
| 92 | .exec_command = ata_exec_command, |
| 93 | .dev_select = ata_std_dev_select, |
| 94 | |
| 95 | .freeze = ata_bmdma_freeze, |
| 96 | .thaw = ata_bmdma_thaw, |
| 97 | .error_handler = ata_bmdma_error_handler, |
| 98 | .post_internal_cmd = ata_bmdma_post_internal_cmd, |
| 99 | |
| 100 | .qc_prep = ata_qc_prep, |
| 101 | .qc_issue = ata_qc_issue_prot, |
| 102 | |
| 103 | .data_xfer = ata_pio_data_xfer_noirq, |
| 104 | |
| 105 | .irq_handler = ata_interrupt, |
| 106 | .irq_clear = ata_bmdma_irq_clear, |
| 107 | |
| 108 | .port_start = ata_port_start, |
| 109 | .port_stop = ata_port_stop, |
| 110 | .host_stop = pata_platform_host_stop |
| 111 | }; |
| 112 | |
| 113 | static void pata_platform_setup_port(struct ata_ioports *ioaddr, |
| 114 | struct pata_platform_info *info) |
| 115 | { |
| 116 | unsigned int shift = 0; |
| 117 | |
| 118 | /* Fixup the port shift for platforms that need it */ |
| 119 | if (info && info->ioport_shift) |
| 120 | shift = info->ioport_shift; |
| 121 | |
| 122 | ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); |
| 123 | ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); |
| 124 | ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); |
| 125 | ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); |
| 126 | ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); |
| 127 | ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); |
| 128 | ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); |
| 129 | ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); |
| 130 | ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); |
| 131 | ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * pata_platform_probe - attach a platform interface |
| 136 | * @pdev: platform device |
| 137 | * |
| 138 | * Register a platform bus IDE interface. Such interfaces are PIO and we |
| 139 | * assume do not support IRQ sharing. |
| 140 | * |
| 141 | * Platform devices are expected to contain 3 resources per port: |
| 142 | * |
| 143 | * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM) |
| 144 | * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM) |
| 145 | * - IRQ (IORESOURCE_IRQ) |
| 146 | * |
| 147 | * If the base resources are both mem types, the ioremap() is handled |
| 148 | * here. For IORESOURCE_IO, it's assumed that there's no remapping |
| 149 | * necessary. |
| 150 | */ |
| 151 | static int __devinit pata_platform_probe(struct platform_device *pdev) |
| 152 | { |
| 153 | struct resource *io_res, *ctl_res; |
| 154 | struct ata_probe_ent ae; |
| 155 | unsigned int mmio; |
| 156 | int ret; |
| 157 | |
| 158 | /* |
| 159 | * Simple resource validation .. |
| 160 | */ |
| 161 | if (unlikely(pdev->num_resources != 3)) { |
| 162 | dev_err(&pdev->dev, "invalid number of resources\n"); |
| 163 | return -EINVAL; |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Get the I/O base first |
| 168 | */ |
| 169 | io_res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
| 170 | if (io_res == NULL) { |
| 171 | io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 172 | if (unlikely(io_res == NULL)) |
| 173 | return -EINVAL; |
| 174 | } |
| 175 | |
| 176 | /* |
| 177 | * Then the CTL base |
| 178 | */ |
| 179 | ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); |
| 180 | if (ctl_res == NULL) { |
| 181 | ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 182 | if (unlikely(ctl_res == NULL)) |
| 183 | return -EINVAL; |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Check for MMIO |
| 188 | */ |
| 189 | mmio = (( io_res->flags == IORESOURCE_MEM) && |
| 190 | (ctl_res->flags == IORESOURCE_MEM)); |
| 191 | |
| 192 | /* |
| 193 | * Now that that's out of the way, wire up the port.. |
| 194 | */ |
| 195 | memset(&ae, 0, sizeof(struct ata_probe_ent)); |
| 196 | INIT_LIST_HEAD(&ae.node); |
| 197 | ae.dev = &pdev->dev; |
| 198 | ae.port_ops = &pata_platform_port_ops; |
| 199 | ae.sht = &pata_platform_sht; |
| 200 | ae.n_ports = 1; |
| 201 | ae.pio_mask = pio_mask; |
| 202 | ae.irq = platform_get_irq(pdev, 0); |
| 203 | ae.irq_flags = 0; |
| 204 | ae.port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST; |
| 205 | |
| 206 | /* |
| 207 | * Handle the MMIO case |
| 208 | */ |
| 209 | if (mmio) { |
| 210 | ae.port_flags |= ATA_FLAG_MMIO; |
| 211 | |
| 212 | ae.port[0].cmd_addr = (unsigned long)ioremap(io_res->start, |
| 213 | io_res->end - io_res->start + 1); |
| 214 | if (unlikely(!ae.port[0].cmd_addr)) { |
| 215 | dev_err(&pdev->dev, "failed to remap IO base\n"); |
| 216 | return -ENXIO; |
| 217 | } |
| 218 | |
| 219 | ae.port[0].ctl_addr = (unsigned long)ioremap(ctl_res->start, |
| 220 | ctl_res->end - ctl_res->start + 1); |
| 221 | if (unlikely(!ae.port[0].ctl_addr)) { |
| 222 | dev_err(&pdev->dev, "failed to remap CTL base\n"); |
| 223 | ret = -ENXIO; |
| 224 | goto bad_remap; |
| 225 | } |
| 226 | } else { |
| 227 | ae.port[0].cmd_addr = io_res->start; |
| 228 | ae.port[0].ctl_addr = ctl_res->start; |
| 229 | } |
| 230 | |
| 231 | ae.port[0].altstatus_addr = ae.port[0].ctl_addr; |
| 232 | |
| 233 | pata_platform_setup_port(&ae.port[0], pdev->dev.platform_data); |
| 234 | |
| 235 | if (unlikely(ata_device_add(&ae) == 0)) { |
| 236 | ret = -ENODEV; |
| 237 | goto add_failed; |
| 238 | } |
| 239 | |
| 240 | return 0; |
| 241 | |
| 242 | add_failed: |
| 243 | if (ae.port[0].ctl_addr && mmio) |
| 244 | iounmap((void __iomem *)ae.port[0].ctl_addr); |
| 245 | bad_remap: |
| 246 | if (ae.port[0].cmd_addr && mmio) |
| 247 | iounmap((void __iomem *)ae.port[0].cmd_addr); |
| 248 | |
| 249 | return ret; |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * pata_platform_remove - unplug a platform interface |
| 254 | * @pdev: platform device |
| 255 | * |
| 256 | * A platform bus ATA device has been unplugged. Perform the needed |
| 257 | * cleanup. Also called on module unload for any active devices. |
| 258 | */ |
| 259 | static int __devexit pata_platform_remove(struct platform_device *pdev) |
| 260 | { |
| 261 | struct device *dev = &pdev->dev; |
| 262 | struct ata_host *host = dev_get_drvdata(dev); |
| 263 | |
| 264 | ata_host_remove(host); |
| 265 | dev_set_drvdata(dev, NULL); |
| 266 | |
| 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | static struct platform_driver pata_platform_driver = { |
| 271 | .probe = pata_platform_probe, |
| 272 | .remove = __devexit_p(pata_platform_remove), |
| 273 | .driver = { |
| 274 | .name = DRV_NAME, |
| 275 | .owner = THIS_MODULE, |
| 276 | }, |
| 277 | }; |
| 278 | |
| 279 | static int __init pata_platform_init(void) |
| 280 | { |
| 281 | return platform_driver_register(&pata_platform_driver); |
| 282 | } |
| 283 | |
| 284 | static void __exit pata_platform_exit(void) |
| 285 | { |
| 286 | platform_driver_unregister(&pata_platform_driver); |
| 287 | } |
| 288 | module_init(pata_platform_init); |
| 289 | module_exit(pata_platform_exit); |
| 290 | |
| 291 | module_param(pio_mask, int, 0); |
| 292 | |
| 293 | MODULE_AUTHOR("Paul Mundt"); |
| 294 | MODULE_DESCRIPTION("low-level driver for platform device ATA"); |
| 295 | MODULE_LICENSE("GPL"); |
| 296 | MODULE_VERSION(DRV_VERSION); |