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 int pata_platform_set_mode(struct ata_port *ap, struct ata_device **unused) 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 return 0; 48 } 49 50 static void pata_platform_host_stop(struct ata_host *host) 51 { 52 int i; 53 54 /* 55 * Unmap the bases for MMIO 56 */ 57 for (i = 0; i < host->n_ports; i++) { 58 struct ata_port *ap = host->ports[i]; 59 60 if (ap->flags & ATA_FLAG_MMIO) { 61 iounmap((void __iomem *)ap->ioaddr.ctl_addr); 62 iounmap((void __iomem *)ap->ioaddr.cmd_addr); 63 } 64 } 65 } 66 67 static struct scsi_host_template pata_platform_sht = { 68 .module = THIS_MODULE, 69 .name = DRV_NAME, 70 .ioctl = ata_scsi_ioctl, 71 .queuecommand = ata_scsi_queuecmd, 72 .can_queue = ATA_DEF_QUEUE, 73 .this_id = ATA_SHT_THIS_ID, 74 .sg_tablesize = LIBATA_MAX_PRD, 75 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 76 .emulated = ATA_SHT_EMULATED, 77 .use_clustering = ATA_SHT_USE_CLUSTERING, 78 .proc_name = DRV_NAME, 79 .dma_boundary = ATA_DMA_BOUNDARY, 80 .slave_configure = ata_scsi_slave_config, 81 .slave_destroy = ata_scsi_slave_destroy, 82 .bios_param = ata_std_bios_param, 83 }; 84 85 static struct ata_port_operations pata_platform_port_ops = { 86 .set_mode = pata_platform_set_mode, 87 88 .port_disable = ata_port_disable, 89 .tf_load = ata_tf_load, 90 .tf_read = ata_tf_read, 91 .check_status = ata_check_status, 92 .exec_command = ata_exec_command, 93 .dev_select = ata_std_dev_select, 94 95 .freeze = ata_bmdma_freeze, 96 .thaw = ata_bmdma_thaw, 97 .error_handler = ata_bmdma_error_handler, 98 .post_internal_cmd = ata_bmdma_post_internal_cmd, 99 100 .qc_prep = ata_qc_prep, 101 .qc_issue = ata_qc_issue_prot, 102 103 .data_xfer = ata_pio_data_xfer_noirq, 104 105 .irq_handler = ata_interrupt, 106 .irq_clear = ata_bmdma_irq_clear, 107 108 .port_start = ata_port_start, 109 .port_stop = ata_port_stop, 110 .host_stop = pata_platform_host_stop 111 }; 112 113 static void pata_platform_setup_port(struct ata_ioports *ioaddr, 114 struct pata_platform_info *info) 115 { 116 unsigned int shift = 0; 117 118 /* Fixup the port shift for platforms that need it */ 119 if (info && info->ioport_shift) 120 shift = info->ioport_shift; 121 122 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); 123 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); 124 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); 125 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); 126 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); 127 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); 128 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); 129 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); 130 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); 131 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); 132 } 133 134 /** 135 * pata_platform_probe - attach a platform interface 136 * @pdev: platform device 137 * 138 * Register a platform bus IDE interface. Such interfaces are PIO and we 139 * assume do not support IRQ sharing. 140 * 141 * Platform devices are expected to contain 3 resources per port: 142 * 143 * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM) 144 * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM) 145 * - IRQ (IORESOURCE_IRQ) 146 * 147 * If the base resources are both mem types, the ioremap() is handled 148 * here. For IORESOURCE_IO, it's assumed that there's no remapping 149 * necessary. 150 */ 151 static int __devinit pata_platform_probe(struct platform_device *pdev) 152 { 153 struct resource *io_res, *ctl_res; 154 struct ata_probe_ent ae; 155 unsigned int mmio; 156 int ret; 157 158 /* 159 * Simple resource validation .. 160 */ 161 if (unlikely(pdev->num_resources != 3)) { 162 dev_err(&pdev->dev, "invalid number of resources\n"); 163 return -EINVAL; 164 } 165 166 /* 167 * Get the I/O base first 168 */ 169 io_res = platform_get_resource(pdev, IORESOURCE_IO, 0); 170 if (io_res == NULL) { 171 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 172 if (unlikely(io_res == NULL)) 173 return -EINVAL; 174 } 175 176 /* 177 * Then the CTL base 178 */ 179 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); 180 if (ctl_res == NULL) { 181 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 182 if (unlikely(ctl_res == NULL)) 183 return -EINVAL; 184 } 185 186 /* 187 * Check for MMIO 188 */ 189 mmio = (( io_res->flags == IORESOURCE_MEM) && 190 (ctl_res->flags == IORESOURCE_MEM)); 191 192 /* 193 * Now that that's out of the way, wire up the port.. 194 */ 195 memset(&ae, 0, sizeof(struct ata_probe_ent)); 196 INIT_LIST_HEAD(&ae.node); 197 ae.dev = &pdev->dev; 198 ae.port_ops = &pata_platform_port_ops; 199 ae.sht = &pata_platform_sht; 200 ae.n_ports = 1; 201 ae.pio_mask = pio_mask; 202 ae.irq = platform_get_irq(pdev, 0); 203 ae.irq_flags = 0; 204 ae.port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST; 205 206 /* 207 * Handle the MMIO case 208 */ 209 if (mmio) { 210 ae.port_flags |= ATA_FLAG_MMIO; 211 212 ae.port[0].cmd_addr = (unsigned long)ioremap(io_res->start, 213 io_res->end - io_res->start + 1); 214 if (unlikely(!ae.port[0].cmd_addr)) { 215 dev_err(&pdev->dev, "failed to remap IO base\n"); 216 return -ENXIO; 217 } 218 219 ae.port[0].ctl_addr = (unsigned long)ioremap(ctl_res->start, 220 ctl_res->end - ctl_res->start + 1); 221 if (unlikely(!ae.port[0].ctl_addr)) { 222 dev_err(&pdev->dev, "failed to remap CTL base\n"); 223 ret = -ENXIO; 224 goto bad_remap; 225 } 226 } else { 227 ae.port[0].cmd_addr = io_res->start; 228 ae.port[0].ctl_addr = ctl_res->start; 229 } 230 231 ae.port[0].altstatus_addr = ae.port[0].ctl_addr; 232 233 pata_platform_setup_port(&ae.port[0], pdev->dev.platform_data); 234 235 if (unlikely(ata_device_add(&ae) == 0)) { 236 ret = -ENODEV; 237 goto add_failed; 238 } 239 240 return 0; 241 242 add_failed: 243 if (ae.port[0].ctl_addr && mmio) 244 iounmap((void __iomem *)ae.port[0].ctl_addr); 245 bad_remap: 246 if (ae.port[0].cmd_addr && mmio) 247 iounmap((void __iomem *)ae.port[0].cmd_addr); 248 249 return ret; 250 } 251 252 /** 253 * pata_platform_remove - unplug a platform interface 254 * @pdev: platform device 255 * 256 * A platform bus ATA device has been unplugged. Perform the needed 257 * cleanup. Also called on module unload for any active devices. 258 */ 259 static int __devexit pata_platform_remove(struct platform_device *pdev) 260 { 261 struct device *dev = &pdev->dev; 262 struct ata_host *host = dev_get_drvdata(dev); 263 264 ata_host_remove(host); 265 dev_set_drvdata(dev, NULL); 266 267 return 0; 268 } 269 270 static struct platform_driver pata_platform_driver = { 271 .probe = pata_platform_probe, 272 .remove = __devexit_p(pata_platform_remove), 273 .driver = { 274 .name = DRV_NAME, 275 .owner = THIS_MODULE, 276 }, 277 }; 278 279 static int __init pata_platform_init(void) 280 { 281 return platform_driver_register(&pata_platform_driver); 282 } 283 284 static void __exit pata_platform_exit(void) 285 { 286 platform_driver_unregister(&pata_platform_driver); 287 } 288 module_init(pata_platform_init); 289 module_exit(pata_platform_exit); 290 291 module_param(pio_mask, int, 0); 292 293 MODULE_AUTHOR("Paul Mundt"); 294 MODULE_DESCRIPTION("low-level driver for platform device ATA"); 295 MODULE_LICENSE("GPL"); 296 MODULE_VERSION(DRV_VERSION); 297