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 "1.0" 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 ata_dev_printk(dev, KERN_INFO, "configured for PIO\n"); 46 } 47 } 48 return 0; 49 } 50 51 static int ata_dummy_ret0(struct ata_port *ap) { return 0; } 52 53 static struct scsi_host_template pata_platform_sht = { 54 .module = THIS_MODULE, 55 .name = DRV_NAME, 56 .ioctl = ata_scsi_ioctl, 57 .queuecommand = ata_scsi_queuecmd, 58 .can_queue = ATA_DEF_QUEUE, 59 .this_id = ATA_SHT_THIS_ID, 60 .sg_tablesize = LIBATA_MAX_PRD, 61 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 62 .emulated = ATA_SHT_EMULATED, 63 .use_clustering = ATA_SHT_USE_CLUSTERING, 64 .proc_name = DRV_NAME, 65 .dma_boundary = ATA_DMA_BOUNDARY, 66 .slave_configure = ata_scsi_slave_config, 67 .slave_destroy = ata_scsi_slave_destroy, 68 .bios_param = ata_std_bios_param, 69 }; 70 71 static struct ata_port_operations pata_platform_port_ops = { 72 .set_mode = pata_platform_set_mode, 73 74 .port_disable = ata_port_disable, 75 .tf_load = ata_tf_load, 76 .tf_read = ata_tf_read, 77 .check_status = ata_check_status, 78 .exec_command = ata_exec_command, 79 .dev_select = ata_std_dev_select, 80 81 .freeze = ata_bmdma_freeze, 82 .thaw = ata_bmdma_thaw, 83 .error_handler = ata_bmdma_error_handler, 84 .post_internal_cmd = ata_bmdma_post_internal_cmd, 85 .cable_detect = ata_cable_unknown, 86 87 .qc_prep = ata_qc_prep, 88 .qc_issue = ata_qc_issue_prot, 89 90 .data_xfer = ata_data_xfer_noirq, 91 92 .irq_clear = ata_bmdma_irq_clear, 93 .irq_on = ata_irq_on, 94 .irq_ack = ata_irq_ack, 95 96 .port_start = ata_dummy_ret0, 97 }; 98 99 static void pata_platform_setup_port(struct ata_ioports *ioaddr, 100 struct pata_platform_info *info) 101 { 102 unsigned int shift = 0; 103 104 /* Fixup the port shift for platforms that need it */ 105 if (info && info->ioport_shift) 106 shift = info->ioport_shift; 107 108 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); 109 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); 110 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); 111 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); 112 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); 113 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); 114 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); 115 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); 116 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); 117 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); 118 } 119 120 /** 121 * pata_platform_probe - attach a platform interface 122 * @pdev: platform device 123 * 124 * Register a platform bus IDE interface. Such interfaces are PIO and we 125 * assume do not support IRQ sharing. 126 * 127 * Platform devices are expected to contain 3 resources per port: 128 * 129 * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM) 130 * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM) 131 * - IRQ (IORESOURCE_IRQ) 132 * 133 * If the base resources are both mem types, the ioremap() is handled 134 * here. For IORESOURCE_IO, it's assumed that there's no remapping 135 * necessary. 136 */ 137 static int __devinit pata_platform_probe(struct platform_device *pdev) 138 { 139 struct resource *io_res, *ctl_res; 140 struct ata_host *host; 141 struct ata_port *ap; 142 unsigned int mmio; 143 144 /* 145 * Simple resource validation .. 146 */ 147 if (unlikely(pdev->num_resources != 3)) { 148 dev_err(&pdev->dev, "invalid number of resources\n"); 149 return -EINVAL; 150 } 151 152 /* 153 * Get the I/O base first 154 */ 155 io_res = platform_get_resource(pdev, IORESOURCE_IO, 0); 156 if (io_res == NULL) { 157 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 158 if (unlikely(io_res == NULL)) 159 return -EINVAL; 160 } 161 162 /* 163 * Then the CTL base 164 */ 165 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); 166 if (ctl_res == NULL) { 167 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 168 if (unlikely(ctl_res == NULL)) 169 return -EINVAL; 170 } 171 172 /* 173 * Check for MMIO 174 */ 175 mmio = (( io_res->flags == IORESOURCE_MEM) && 176 (ctl_res->flags == IORESOURCE_MEM)); 177 178 /* 179 * Now that that's out of the way, wire up the port.. 180 */ 181 host = ata_host_alloc(&pdev->dev, 1); 182 if (!host) 183 return -ENOMEM; 184 ap = host->ports[0]; 185 186 ap->ops = &pata_platform_port_ops; 187 ap->pio_mask = pio_mask; 188 ap->flags |= ATA_FLAG_SLAVE_POSS; 189 190 /* 191 * Handle the MMIO case 192 */ 193 if (mmio) { 194 ap->ioaddr.cmd_addr = devm_ioremap(&pdev->dev, io_res->start, 195 io_res->end - io_res->start + 1); 196 ap->ioaddr.ctl_addr = devm_ioremap(&pdev->dev, ctl_res->start, 197 ctl_res->end - ctl_res->start + 1); 198 } else { 199 ap->ioaddr.cmd_addr = devm_ioport_map(&pdev->dev, io_res->start, 200 io_res->end - io_res->start + 1); 201 ap->ioaddr.ctl_addr = devm_ioport_map(&pdev->dev, ctl_res->start, 202 ctl_res->end - ctl_res->start + 1); 203 } 204 if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) { 205 dev_err(&pdev->dev, "failed to map IO/CTL base\n"); 206 return -ENOMEM; 207 } 208 209 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; 210 211 pata_platform_setup_port(&ap->ioaddr, pdev->dev.platform_data); 212 213 /* activate */ 214 return ata_host_activate(host, platform_get_irq(pdev, 0), ata_interrupt, 215 0, &pata_platform_sht); 216 } 217 218 /** 219 * pata_platform_remove - unplug a platform interface 220 * @pdev: platform device 221 * 222 * A platform bus ATA device has been unplugged. Perform the needed 223 * cleanup. Also called on module unload for any active devices. 224 */ 225 static int __devexit pata_platform_remove(struct platform_device *pdev) 226 { 227 struct device *dev = &pdev->dev; 228 struct ata_host *host = dev_get_drvdata(dev); 229 230 ata_host_detach(host); 231 232 return 0; 233 } 234 235 static struct platform_driver pata_platform_driver = { 236 .probe = pata_platform_probe, 237 .remove = __devexit_p(pata_platform_remove), 238 .driver = { 239 .name = DRV_NAME, 240 .owner = THIS_MODULE, 241 }, 242 }; 243 244 static int __init pata_platform_init(void) 245 { 246 return platform_driver_register(&pata_platform_driver); 247 } 248 249 static void __exit pata_platform_exit(void) 250 { 251 platform_driver_unregister(&pata_platform_driver); 252 } 253 module_init(pata_platform_init); 254 module_exit(pata_platform_exit); 255 256 module_param(pio_mask, int, 0); 257 258 MODULE_AUTHOR("Paul Mundt"); 259 MODULE_DESCRIPTION("low-level driver for platform device ATA"); 260 MODULE_LICENSE("GPL"); 261 MODULE_VERSION(DRV_VERSION); 262