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/blkdev.h> 17 #include <scsi/scsi_host.h> 18 #include <linux/ata.h> 19 #include <linux/libata.h> 20 #include <linux/platform_device.h> 21 #include <linux/ata_platform.h> 22 23 #define DRV_NAME "pata_platform" 24 #define DRV_VERSION "1.2" 25 26 static int pio_mask = 1; 27 28 /* 29 * Provide our own set_mode() as we don't want to change anything that has 30 * already been configured.. 31 */ 32 static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused) 33 { 34 struct ata_device *dev; 35 36 ata_for_each_dev(dev, link, ENABLED) { 37 /* We don't really care */ 38 dev->pio_mode = dev->xfer_mode = XFER_PIO_0; 39 dev->xfer_shift = ATA_SHIFT_PIO; 40 dev->flags |= ATA_DFLAG_PIO; 41 ata_dev_info(dev, "configured for PIO\n"); 42 } 43 return 0; 44 } 45 46 static struct scsi_host_template pata_platform_sht = { 47 ATA_PIO_SHT(DRV_NAME), 48 }; 49 50 static struct ata_port_operations pata_platform_port_ops = { 51 .inherits = &ata_sff_port_ops, 52 .sff_data_xfer = ata_sff_data_xfer32, 53 .cable_detect = ata_cable_unknown, 54 .set_mode = pata_platform_set_mode, 55 }; 56 57 static void pata_platform_setup_port(struct ata_ioports *ioaddr, 58 unsigned int shift) 59 { 60 /* Fixup the port shift for platforms that need it */ 61 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); 62 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); 63 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); 64 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); 65 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); 66 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); 67 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); 68 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); 69 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); 70 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); 71 } 72 73 /** 74 * __pata_platform_probe - attach a platform interface 75 * @dev: device 76 * @io_res: Resource representing I/O base 77 * @ctl_res: Resource representing CTL base 78 * @irq_res: Resource representing IRQ and its flags 79 * @ioport_shift: I/O port shift 80 * @__pio_mask: PIO mask 81 * @sht: scsi_host_template to use when registering 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 struct scsi_host_template *sht) 105 { 106 struct ata_host *host; 107 struct ata_port *ap; 108 unsigned int mmio; 109 int irq = 0; 110 int irq_flags = 0; 111 112 /* 113 * Check for MMIO 114 */ 115 mmio = (( io_res->flags == IORESOURCE_MEM) && 116 (ctl_res->flags == IORESOURCE_MEM)); 117 118 /* 119 * And the IRQ 120 */ 121 if (irq_res && irq_res->start > 0) { 122 irq = irq_res->start; 123 irq_flags = irq_res->flags & IRQF_TRIGGER_MASK; 124 } 125 126 /* 127 * Now that that's out of the way, wire up the port.. 128 */ 129 host = ata_host_alloc(dev, 1); 130 if (!host) 131 return -ENOMEM; 132 ap = host->ports[0]; 133 134 ap->ops = &pata_platform_port_ops; 135 ap->pio_mask = __pio_mask; 136 ap->flags |= ATA_FLAG_SLAVE_POSS; 137 138 /* 139 * Use polling mode if there's no IRQ 140 */ 141 if (!irq) { 142 ap->flags |= ATA_FLAG_PIO_POLLING; 143 ata_port_desc(ap, "no IRQ, using PIO polling"); 144 } 145 146 /* 147 * Handle the MMIO case 148 */ 149 if (mmio) { 150 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start, 151 resource_size(io_res)); 152 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start, 153 resource_size(ctl_res)); 154 } else { 155 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start, 156 resource_size(io_res)); 157 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start, 158 resource_size(ctl_res)); 159 } 160 if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) { 161 dev_err(dev, "failed to map IO/CTL base\n"); 162 return -ENOMEM; 163 } 164 165 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; 166 167 pata_platform_setup_port(&ap->ioaddr, ioport_shift); 168 169 ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport", 170 (unsigned long long)io_res->start, 171 (unsigned long long)ctl_res->start); 172 173 /* activate */ 174 return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL, 175 irq_flags, sht); 176 } 177 EXPORT_SYMBOL_GPL(__pata_platform_probe); 178 179 static int pata_platform_probe(struct platform_device *pdev) 180 { 181 struct resource *io_res; 182 struct resource *ctl_res; 183 struct resource *irq_res; 184 struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev); 185 186 /* 187 * Simple resource validation .. 188 */ 189 if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) { 190 dev_err(&pdev->dev, "invalid number of resources\n"); 191 return -EINVAL; 192 } 193 194 /* 195 * Get the I/O base first 196 */ 197 io_res = platform_get_resource(pdev, IORESOURCE_IO, 0); 198 if (io_res == NULL) { 199 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 200 if (unlikely(io_res == NULL)) 201 return -EINVAL; 202 } 203 204 /* 205 * Then the CTL base 206 */ 207 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); 208 if (ctl_res == NULL) { 209 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 210 if (unlikely(ctl_res == NULL)) 211 return -EINVAL; 212 } 213 214 /* 215 * And the IRQ 216 */ 217 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 218 219 return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res, 220 pp_info ? pp_info->ioport_shift : 0, 221 pio_mask, &pata_platform_sht); 222 } 223 224 static struct platform_driver pata_platform_driver = { 225 .probe = pata_platform_probe, 226 .remove = ata_platform_remove_one, 227 .driver = { 228 .name = DRV_NAME, 229 }, 230 }; 231 232 module_platform_driver(pata_platform_driver); 233 234 module_param(pio_mask, int, 0); 235 236 MODULE_AUTHOR("Paul Mundt"); 237 MODULE_DESCRIPTION("low-level driver for platform device ATA"); 238 MODULE_LICENSE("GPL"); 239 MODULE_VERSION(DRV_VERSION); 240 MODULE_ALIAS("platform:" DRV_NAME); 241