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, 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 struct scsi_host_template pata_platform_sht = { 50 ATA_PIO_SHT(DRV_NAME), 51 }; 52 53 static struct ata_port_operations pata_platform_port_ops = { 54 .inherits = &ata_sff_port_ops, 55 .sff_data_xfer = ata_sff_data_xfer_noirq, 56 .cable_detect = ata_cable_unknown, 57 .set_mode = pata_platform_set_mode, 58 .port_start = ATA_OP_NULL, 59 }; 60 61 static void pata_platform_setup_port(struct ata_ioports *ioaddr, 62 unsigned int shift) 63 { 64 /* Fixup the port shift for platforms that need it */ 65 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); 66 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); 67 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); 68 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); 69 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); 70 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); 71 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); 72 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); 73 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); 74 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); 75 } 76 77 /** 78 * __pata_platform_probe - attach a platform interface 79 * @dev: device 80 * @io_res: Resource representing I/O base 81 * @ctl_res: Resource representing CTL base 82 * @irq_res: Resource representing IRQ and its flags 83 * @ioport_shift: I/O port shift 84 * @__pio_mask: PIO mask 85 * 86 * Register a platform bus IDE interface. Such interfaces are PIO and we 87 * assume do not support IRQ sharing. 88 * 89 * Platform devices are expected to contain at least 2 resources per port: 90 * 91 * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM) 92 * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM) 93 * 94 * and optionally: 95 * 96 * - IRQ (IORESOURCE_IRQ) 97 * 98 * If the base resources are both mem types, the ioremap() is handled 99 * here. For IORESOURCE_IO, it's assumed that there's no remapping 100 * necessary. 101 * 102 * If no IRQ resource is present, PIO polling mode is used instead. 103 */ 104 int __devinit __pata_platform_probe(struct device *dev, 105 struct resource *io_res, 106 struct resource *ctl_res, 107 struct resource *irq_res, 108 unsigned int ioport_shift, 109 int __pio_mask) 110 { 111 struct ata_host *host; 112 struct ata_port *ap; 113 unsigned int mmio; 114 int irq = 0; 115 int irq_flags = 0; 116 117 /* 118 * Check for MMIO 119 */ 120 mmio = (( io_res->flags == IORESOURCE_MEM) && 121 (ctl_res->flags == IORESOURCE_MEM)); 122 123 /* 124 * And the IRQ 125 */ 126 if (irq_res && irq_res->start > 0) { 127 irq = irq_res->start; 128 irq_flags = irq_res->flags; 129 } 130 131 /* 132 * Now that that's out of the way, wire up the port.. 133 */ 134 host = ata_host_alloc(dev, 1); 135 if (!host) 136 return -ENOMEM; 137 ap = host->ports[0]; 138 139 ap->ops = &pata_platform_port_ops; 140 ap->pio_mask = __pio_mask; 141 ap->flags |= ATA_FLAG_SLAVE_POSS; 142 143 /* 144 * Use polling mode if there's no IRQ 145 */ 146 if (!irq) { 147 ap->flags |= ATA_FLAG_PIO_POLLING; 148 ata_port_desc(ap, "no IRQ, using PIO polling"); 149 } 150 151 /* 152 * Handle the MMIO case 153 */ 154 if (mmio) { 155 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start, 156 io_res->end - io_res->start + 1); 157 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start, 158 ctl_res->end - ctl_res->start + 1); 159 } else { 160 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start, 161 io_res->end - io_res->start + 1); 162 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start, 163 ctl_res->end - ctl_res->start + 1); 164 } 165 if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) { 166 dev_err(dev, "failed to map IO/CTL base\n"); 167 return -ENOMEM; 168 } 169 170 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; 171 172 pata_platform_setup_port(&ap->ioaddr, ioport_shift); 173 174 ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport", 175 (unsigned long long)io_res->start, 176 (unsigned long long)ctl_res->start); 177 178 /* activate */ 179 return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL, 180 irq_flags, &pata_platform_sht); 181 } 182 EXPORT_SYMBOL_GPL(__pata_platform_probe); 183 184 /** 185 * __pata_platform_remove - unplug a platform interface 186 * @dev: device 187 * 188 * A platform bus ATA device has been unplugged. Perform the needed 189 * cleanup. Also called on module unload for any active devices. 190 */ 191 int __devexit __pata_platform_remove(struct device *dev) 192 { 193 struct ata_host *host = dev_get_drvdata(dev); 194 195 ata_host_detach(host); 196 197 return 0; 198 } 199 EXPORT_SYMBOL_GPL(__pata_platform_remove); 200 201 static int __devinit pata_platform_probe(struct platform_device *pdev) 202 { 203 struct resource *io_res; 204 struct resource *ctl_res; 205 struct resource *irq_res; 206 struct pata_platform_info *pp_info = pdev->dev.platform_data; 207 208 /* 209 * Simple resource validation .. 210 */ 211 if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) { 212 dev_err(&pdev->dev, "invalid number of resources\n"); 213 return -EINVAL; 214 } 215 216 /* 217 * Get the I/O base first 218 */ 219 io_res = platform_get_resource(pdev, IORESOURCE_IO, 0); 220 if (io_res == NULL) { 221 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 222 if (unlikely(io_res == NULL)) 223 return -EINVAL; 224 } 225 226 /* 227 * Then the CTL base 228 */ 229 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); 230 if (ctl_res == NULL) { 231 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 232 if (unlikely(ctl_res == NULL)) 233 return -EINVAL; 234 } 235 236 /* 237 * And the IRQ 238 */ 239 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 240 if (irq_res) 241 irq_res->flags = pp_info ? pp_info->irq_flags : 0; 242 243 return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res, 244 pp_info ? pp_info->ioport_shift : 0, 245 pio_mask); 246 } 247 248 static int __devexit pata_platform_remove(struct platform_device *pdev) 249 { 250 return __pata_platform_remove(&pdev->dev); 251 } 252 253 static struct platform_driver pata_platform_driver = { 254 .probe = pata_platform_probe, 255 .remove = __devexit_p(pata_platform_remove), 256 .driver = { 257 .name = DRV_NAME, 258 .owner = THIS_MODULE, 259 }, 260 }; 261 262 static int __init pata_platform_init(void) 263 { 264 return platform_driver_register(&pata_platform_driver); 265 } 266 267 static void __exit pata_platform_exit(void) 268 { 269 platform_driver_unregister(&pata_platform_driver); 270 } 271 module_init(pata_platform_init); 272 module_exit(pata_platform_exit); 273 274 module_param(pio_mask, int, 0); 275 276 MODULE_AUTHOR("Paul Mundt"); 277 MODULE_DESCRIPTION("low-level driver for platform device ATA"); 278 MODULE_LICENSE("GPL"); 279 MODULE_VERSION(DRV_VERSION); 280 MODULE_ALIAS("platform:" DRV_NAME); 281