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