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