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