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 "1.1" 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 int ata_dummy_ret0(struct ata_port *ap) { return 0; } 50 51 static struct scsi_host_template pata_platform_sht = { 52 .module = THIS_MODULE, 53 .name = DRV_NAME, 54 .ioctl = ata_scsi_ioctl, 55 .queuecommand = ata_scsi_queuecmd, 56 .can_queue = ATA_DEF_QUEUE, 57 .this_id = ATA_SHT_THIS_ID, 58 .sg_tablesize = LIBATA_MAX_PRD, 59 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 60 .emulated = ATA_SHT_EMULATED, 61 .use_clustering = ATA_SHT_USE_CLUSTERING, 62 .proc_name = DRV_NAME, 63 .dma_boundary = ATA_DMA_BOUNDARY, 64 .slave_configure = ata_scsi_slave_config, 65 .slave_destroy = ata_scsi_slave_destroy, 66 .bios_param = ata_std_bios_param, 67 }; 68 69 static struct ata_port_operations pata_platform_port_ops = { 70 .set_mode = pata_platform_set_mode, 71 72 .tf_load = ata_tf_load, 73 .tf_read = ata_tf_read, 74 .check_status = ata_check_status, 75 .exec_command = ata_exec_command, 76 .dev_select = ata_std_dev_select, 77 78 .freeze = ata_bmdma_freeze, 79 .thaw = ata_bmdma_thaw, 80 .error_handler = ata_bmdma_error_handler, 81 .post_internal_cmd = ata_bmdma_post_internal_cmd, 82 .cable_detect = ata_cable_unknown, 83 84 .qc_prep = ata_qc_prep, 85 .qc_issue = ata_qc_issue_prot, 86 87 .data_xfer = ata_data_xfer_noirq, 88 89 .irq_clear = ata_bmdma_irq_clear, 90 .irq_on = ata_irq_on, 91 92 .port_start = ata_dummy_ret0, 93 }; 94 95 static void pata_platform_setup_port(struct ata_ioports *ioaddr, 96 struct pata_platform_info *info) 97 { 98 unsigned int shift = 0; 99 100 /* Fixup the port shift for platforms that need it */ 101 if (info && info->ioport_shift) 102 shift = info->ioport_shift; 103 104 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); 105 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); 106 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); 107 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); 108 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); 109 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); 110 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); 111 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); 112 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); 113 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); 114 } 115 116 /** 117 * pata_platform_probe - attach a platform interface 118 * @pdev: platform device 119 * 120 * Register a platform bus IDE interface. Such interfaces are PIO and we 121 * assume do not support IRQ sharing. 122 * 123 * Platform devices are expected to contain 3 resources per port: 124 * 125 * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM) 126 * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM) 127 * - IRQ (IORESOURCE_IRQ) 128 * 129 * If the base resources are both mem types, the ioremap() is handled 130 * here. For IORESOURCE_IO, it's assumed that there's no remapping 131 * necessary. 132 */ 133 static int __devinit pata_platform_probe(struct platform_device *pdev) 134 { 135 struct resource *io_res, *ctl_res; 136 struct ata_host *host; 137 struct ata_port *ap; 138 struct pata_platform_info *pp_info; 139 unsigned int mmio; 140 141 /* 142 * Simple resource validation .. 143 */ 144 if (unlikely(pdev->num_resources != 3)) { 145 dev_err(&pdev->dev, "invalid number of resources\n"); 146 return -EINVAL; 147 } 148 149 /* 150 * Get the I/O base first 151 */ 152 io_res = platform_get_resource(pdev, IORESOURCE_IO, 0); 153 if (io_res == NULL) { 154 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 155 if (unlikely(io_res == NULL)) 156 return -EINVAL; 157 } 158 159 /* 160 * Then the CTL base 161 */ 162 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); 163 if (ctl_res == NULL) { 164 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 165 if (unlikely(ctl_res == NULL)) 166 return -EINVAL; 167 } 168 169 /* 170 * Check for MMIO 171 */ 172 mmio = (( io_res->flags == IORESOURCE_MEM) && 173 (ctl_res->flags == IORESOURCE_MEM)); 174 175 /* 176 * Now that that's out of the way, wire up the port.. 177 */ 178 host = ata_host_alloc(&pdev->dev, 1); 179 if (!host) 180 return -ENOMEM; 181 ap = host->ports[0]; 182 183 ap->ops = &pata_platform_port_ops; 184 ap->pio_mask = pio_mask; 185 ap->flags |= ATA_FLAG_SLAVE_POSS; 186 187 /* 188 * Handle the MMIO case 189 */ 190 if (mmio) { 191 ap->ioaddr.cmd_addr = devm_ioremap(&pdev->dev, io_res->start, 192 io_res->end - io_res->start + 1); 193 ap->ioaddr.ctl_addr = devm_ioremap(&pdev->dev, ctl_res->start, 194 ctl_res->end - ctl_res->start + 1); 195 } else { 196 ap->ioaddr.cmd_addr = devm_ioport_map(&pdev->dev, io_res->start, 197 io_res->end - io_res->start + 1); 198 ap->ioaddr.ctl_addr = devm_ioport_map(&pdev->dev, ctl_res->start, 199 ctl_res->end - ctl_res->start + 1); 200 } 201 if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) { 202 dev_err(&pdev->dev, "failed to map IO/CTL base\n"); 203 return -ENOMEM; 204 } 205 206 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; 207 208 pp_info = pdev->dev.platform_data; 209 pata_platform_setup_port(&ap->ioaddr, pp_info); 210 211 ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport", 212 (unsigned long long)io_res->start, 213 (unsigned long long)ctl_res->start); 214 215 /* activate */ 216 return ata_host_activate(host, platform_get_irq(pdev, 0), 217 ata_interrupt, pp_info ? pp_info->irq_flags 218 : 0, &pata_platform_sht); 219 } 220 221 /** 222 * pata_platform_remove - unplug a platform interface 223 * @pdev: platform device 224 * 225 * A platform bus ATA device has been unplugged. Perform the needed 226 * cleanup. Also called on module unload for any active devices. 227 */ 228 static int __devexit pata_platform_remove(struct platform_device *pdev) 229 { 230 struct device *dev = &pdev->dev; 231 struct ata_host *host = dev_get_drvdata(dev); 232 233 ata_host_detach(host); 234 235 return 0; 236 } 237 238 static struct platform_driver pata_platform_driver = { 239 .probe = pata_platform_probe, 240 .remove = __devexit_p(pata_platform_remove), 241 .driver = { 242 .name = DRV_NAME, 243 .owner = THIS_MODULE, 244 }, 245 }; 246 247 static int __init pata_platform_init(void) 248 { 249 return platform_driver_register(&pata_platform_driver); 250 } 251 252 static void __exit pata_platform_exit(void) 253 { 254 platform_driver_unregister(&pata_platform_driver); 255 } 256 module_init(pata_platform_init); 257 module_exit(pata_platform_exit); 258 259 module_param(pio_mask, int, 0); 260 261 MODULE_AUTHOR("Paul Mundt"); 262 MODULE_DESCRIPTION("low-level driver for platform device ATA"); 263 MODULE_LICENSE("GPL"); 264 MODULE_VERSION(DRV_VERSION); 265