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