1 /* 2 * Generic platform device PATA driver 3 * 4 * Copyright (C) 2006 - 2007 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/ata_platform.h> 23 24 #define DRV_NAME "pata_platform" 25 #define DRV_VERSION "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 */ 33 static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused) 34 { 35 struct ata_device *dev; 36 37 ata_link_for_each_dev(dev, link) { 38 if (ata_dev_enabled(dev)) { 39 /* We don't really care */ 40 dev->pio_mode = dev->xfer_mode = XFER_PIO_0; 41 dev->xfer_shift = ATA_SHIFT_PIO; 42 dev->flags |= ATA_DFLAG_PIO; 43 ata_dev_printk(dev, KERN_INFO, "configured for PIO\n"); 44 } 45 } 46 return 0; 47 } 48 49 static int ata_dummy_ret0(struct ata_port *ap) { return 0; } 50 51 static struct scsi_host_template pata_platform_sht = { 52 .module = THIS_MODULE, 53 .name = DRV_NAME, 54 .ioctl = ata_scsi_ioctl, 55 .queuecommand = ata_scsi_queuecmd, 56 .can_queue = ATA_DEF_QUEUE, 57 .this_id = ATA_SHT_THIS_ID, 58 .sg_tablesize = LIBATA_MAX_PRD, 59 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 60 .emulated = ATA_SHT_EMULATED, 61 .use_clustering = ATA_SHT_USE_CLUSTERING, 62 .proc_name = DRV_NAME, 63 .dma_boundary = ATA_DMA_BOUNDARY, 64 .slave_configure = ata_scsi_slave_config, 65 .slave_destroy = ata_scsi_slave_destroy, 66 .bios_param = ata_std_bios_param, 67 }; 68 69 static struct ata_port_operations pata_platform_port_ops = { 70 .set_mode = pata_platform_set_mode, 71 72 .tf_load = ata_tf_load, 73 .tf_read = ata_tf_read, 74 .check_status = ata_check_status, 75 .exec_command = ata_exec_command, 76 .dev_select = ata_std_dev_select, 77 78 .freeze = ata_bmdma_freeze, 79 .thaw = ata_bmdma_thaw, 80 .error_handler = ata_bmdma_error_handler, 81 .post_internal_cmd = ata_bmdma_post_internal_cmd, 82 .cable_detect = ata_cable_unknown, 83 84 .qc_prep = ata_qc_prep, 85 .qc_issue = ata_qc_issue_prot, 86 87 .data_xfer = ata_data_xfer_noirq, 88 89 .irq_clear = ata_bmdma_irq_clear, 90 .irq_on = ata_irq_on, 91 92 .port_start = ata_dummy_ret0, 93 }; 94 95 static void pata_platform_setup_port(struct ata_ioports *ioaddr, 96 unsigned int shift) 97 { 98 /* Fixup the port shift for platforms that need it */ 99 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); 100 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); 101 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); 102 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); 103 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); 104 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); 105 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); 106 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); 107 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); 108 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); 109 } 110 111 /** 112 * __pata_platform_probe - attach a platform interface 113 * @dev: device 114 * @io_res: Resource representing I/O base 115 * @ctl_res: Resource representing CTL base 116 * @irq_res: Resource representing IRQ and its flags 117 * @ioport_shift: I/O port shift 118 * @__pio_mask: PIO mask 119 * 120 * Register a platform bus IDE interface. Such interfaces are PIO and we 121 * assume do not support IRQ sharing. 122 * 123 * Platform devices are expected to contain at least 2 resources per port: 124 * 125 * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM) 126 * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM) 127 * 128 * and optionally: 129 * 130 * - IRQ (IORESOURCE_IRQ) 131 * 132 * If the base resources are both mem types, the ioremap() is handled 133 * here. For IORESOURCE_IO, it's assumed that there's no remapping 134 * necessary. 135 * 136 * If no IRQ resource is present, PIO polling mode is used instead. 137 */ 138 int __devinit __pata_platform_probe(struct device *dev, 139 struct resource *io_res, 140 struct resource *ctl_res, 141 struct resource *irq_res, 142 unsigned int ioport_shift, 143 int __pio_mask) 144 { 145 struct ata_host *host; 146 struct ata_port *ap; 147 unsigned int mmio; 148 int irq = 0; 149 int irq_flags = 0; 150 151 /* 152 * Check for MMIO 153 */ 154 mmio = (( io_res->flags == IORESOURCE_MEM) && 155 (ctl_res->flags == IORESOURCE_MEM)); 156 157 /* 158 * And the IRQ 159 */ 160 if (irq_res && irq_res->start > 0) { 161 irq = irq_res->start; 162 irq_flags = irq_res->flags; 163 } 164 165 /* 166 * Now that that's out of the way, wire up the port.. 167 */ 168 host = ata_host_alloc(dev, 1); 169 if (!host) 170 return -ENOMEM; 171 ap = host->ports[0]; 172 173 ap->ops = &pata_platform_port_ops; 174 ap->pio_mask = __pio_mask; 175 ap->flags |= ATA_FLAG_SLAVE_POSS; 176 177 /* 178 * Use polling mode if there's no IRQ 179 */ 180 if (!irq) { 181 ap->flags |= ATA_FLAG_PIO_POLLING; 182 ata_port_desc(ap, "no IRQ, using PIO polling"); 183 } 184 185 /* 186 * Handle the MMIO case 187 */ 188 if (mmio) { 189 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start, 190 io_res->end - io_res->start + 1); 191 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start, 192 ctl_res->end - ctl_res->start + 1); 193 } else { 194 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start, 195 io_res->end - io_res->start + 1); 196 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start, 197 ctl_res->end - ctl_res->start + 1); 198 } 199 if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) { 200 dev_err(dev, "failed to map IO/CTL base\n"); 201 return -ENOMEM; 202 } 203 204 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; 205 206 pata_platform_setup_port(&ap->ioaddr, ioport_shift); 207 208 ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport", 209 (unsigned long long)io_res->start, 210 (unsigned long long)ctl_res->start); 211 212 /* activate */ 213 return ata_host_activate(host, irq, irq ? ata_interrupt : NULL, 214 irq_flags, &pata_platform_sht); 215 } 216 EXPORT_SYMBOL_GPL(__pata_platform_probe); 217 218 /** 219 * __pata_platform_remove - unplug a platform interface 220 * @dev: device 221 * 222 * A platform bus ATA device has been unplugged. Perform the needed 223 * cleanup. Also called on module unload for any active devices. 224 */ 225 int __devexit __pata_platform_remove(struct device *dev) 226 { 227 struct ata_host *host = dev_get_drvdata(dev); 228 229 ata_host_detach(host); 230 231 return 0; 232 } 233 EXPORT_SYMBOL_GPL(__pata_platform_remove); 234 235 static int __devinit pata_platform_probe(struct platform_device *pdev) 236 { 237 struct resource *io_res; 238 struct resource *ctl_res; 239 struct resource *irq_res; 240 struct pata_platform_info *pp_info = pdev->dev.platform_data; 241 242 /* 243 * Simple resource validation .. 244 */ 245 if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) { 246 dev_err(&pdev->dev, "invalid number of resources\n"); 247 return -EINVAL; 248 } 249 250 /* 251 * Get the I/O base first 252 */ 253 io_res = platform_get_resource(pdev, IORESOURCE_IO, 0); 254 if (io_res == NULL) { 255 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 256 if (unlikely(io_res == NULL)) 257 return -EINVAL; 258 } 259 260 /* 261 * Then the CTL base 262 */ 263 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); 264 if (ctl_res == NULL) { 265 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 266 if (unlikely(ctl_res == NULL)) 267 return -EINVAL; 268 } 269 270 /* 271 * And the IRQ 272 */ 273 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 274 if (irq_res) 275 irq_res->flags = pp_info ? pp_info->irq_flags : 0; 276 277 return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res, 278 pp_info ? pp_info->ioport_shift : 0, 279 pio_mask); 280 } 281 282 static int __devexit pata_platform_remove(struct platform_device *pdev) 283 { 284 return __pata_platform_remove(&pdev->dev); 285 } 286 287 static struct platform_driver pata_platform_driver = { 288 .probe = pata_platform_probe, 289 .remove = __devexit_p(pata_platform_remove), 290 .driver = { 291 .name = DRV_NAME, 292 .owner = THIS_MODULE, 293 }, 294 }; 295 296 static int __init pata_platform_init(void) 297 { 298 return platform_driver_register(&pata_platform_driver); 299 } 300 301 static void __exit pata_platform_exit(void) 302 { 303 platform_driver_unregister(&pata_platform_driver); 304 } 305 module_init(pata_platform_init); 306 module_exit(pata_platform_exit); 307 308 module_param(pio_mask, int, 0); 309 310 MODULE_AUTHOR("Paul Mundt"); 311 MODULE_DESCRIPTION("low-level driver for platform device ATA"); 312 MODULE_LICENSE("GPL"); 313 MODULE_VERSION(DRV_VERSION); 314