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 module_param(pio_mask, int, 0); 28 MODULE_PARM_DESC(pio_mask, "PIO modes supported, mode 0 only by default"); 29 30 /* 31 * Provide our own set_mode() as we don't want to change anything that has 32 * already been configured.. 33 */ 34 static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused) 35 { 36 struct ata_device *dev; 37 38 ata_for_each_dev(dev, link, ENABLED) { 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_info(dev, "configured for PIO\n"); 44 } 45 return 0; 46 } 47 48 static struct scsi_host_template pata_platform_sht = { 49 ATA_PIO_SHT(DRV_NAME), 50 }; 51 52 static void pata_platform_setup_port(struct ata_ioports *ioaddr, 53 unsigned int shift) 54 { 55 /* Fixup the port shift for platforms that need it */ 56 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); 57 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); 58 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); 59 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); 60 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); 61 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); 62 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); 63 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); 64 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); 65 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); 66 } 67 68 /** 69 * __pata_platform_probe - attach a platform interface 70 * @dev: device 71 * @io_res: Resource representing I/O base 72 * @ctl_res: Resource representing CTL base 73 * @irq_res: Resource representing IRQ and its flags 74 * @ioport_shift: I/O port shift 75 * @__pio_mask: PIO mask 76 * @sht: scsi_host_template to use when registering 77 * @use16bit: Flag to indicate 16-bit IO instead of 32-bit 78 * 79 * Register a platform bus IDE interface. Such interfaces are PIO and we 80 * assume do not support IRQ sharing. 81 * 82 * Platform devices are expected to contain at least 2 resources per port: 83 * 84 * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM) 85 * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM) 86 * 87 * and optionally: 88 * 89 * - IRQ (IORESOURCE_IRQ) 90 * 91 * If the base resources are both mem types, the ioremap() is handled 92 * here. For IORESOURCE_IO, it's assumed that there's no remapping 93 * necessary. 94 * 95 * If no IRQ resource is present, PIO polling mode is used instead. 96 */ 97 int __pata_platform_probe(struct device *dev, struct resource *io_res, 98 struct resource *ctl_res, struct resource *irq_res, 99 unsigned int ioport_shift, int __pio_mask, 100 struct scsi_host_template *sht, bool use16bit) 101 { 102 struct ata_host *host; 103 struct ata_port *ap; 104 unsigned int mmio; 105 int irq = 0; 106 int irq_flags = 0; 107 108 /* 109 * Check for MMIO 110 */ 111 mmio = (( io_res->flags == IORESOURCE_MEM) && 112 (ctl_res->flags == IORESOURCE_MEM)); 113 114 /* 115 * And the IRQ 116 */ 117 if (irq_res && irq_res->start > 0) { 118 irq = irq_res->start; 119 irq_flags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED; 120 } 121 122 /* 123 * Now that that's out of the way, wire up the port.. 124 */ 125 host = ata_host_alloc(dev, 1); 126 if (!host) 127 return -ENOMEM; 128 ap = host->ports[0]; 129 130 ap->ops = devm_kzalloc(dev, sizeof(*ap->ops), GFP_KERNEL); 131 ap->ops->inherits = &ata_sff_port_ops; 132 ap->ops->cable_detect = ata_cable_unknown; 133 ap->ops->set_mode = pata_platform_set_mode; 134 if (use16bit) 135 ap->ops->sff_data_xfer = ata_sff_data_xfer; 136 else 137 ap->ops->sff_data_xfer = ata_sff_data_xfer32; 138 139 ap->pio_mask = __pio_mask; 140 ap->flags |= ATA_FLAG_SLAVE_POSS; 141 142 /* 143 * Use polling mode if there's no IRQ 144 */ 145 if (!irq) { 146 ap->flags |= ATA_FLAG_PIO_POLLING; 147 ata_port_desc(ap, "no IRQ, using PIO polling"); 148 } 149 150 /* 151 * Handle the MMIO case 152 */ 153 if (mmio) { 154 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start, 155 resource_size(io_res)); 156 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start, 157 resource_size(ctl_res)); 158 } else { 159 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start, 160 resource_size(io_res)); 161 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start, 162 resource_size(ctl_res)); 163 } 164 if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) { 165 dev_err(dev, "failed to map IO/CTL base\n"); 166 return -ENOMEM; 167 } 168 169 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; 170 171 pata_platform_setup_port(&ap->ioaddr, ioport_shift); 172 173 ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport", 174 (unsigned long long)io_res->start, 175 (unsigned long long)ctl_res->start); 176 177 /* activate */ 178 return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL, 179 irq_flags, sht); 180 } 181 EXPORT_SYMBOL_GPL(__pata_platform_probe); 182 183 static int pata_platform_probe(struct platform_device *pdev) 184 { 185 struct resource *io_res; 186 struct resource *ctl_res; 187 struct resource *irq_res; 188 struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev); 189 190 /* 191 * Simple resource validation .. 192 */ 193 if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) { 194 dev_err(&pdev->dev, "invalid number of resources\n"); 195 return -EINVAL; 196 } 197 198 /* 199 * Get the I/O base first 200 */ 201 io_res = platform_get_resource(pdev, IORESOURCE_IO, 0); 202 if (io_res == NULL) { 203 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 204 if (unlikely(io_res == NULL)) 205 return -EINVAL; 206 } 207 208 /* 209 * Then the CTL base 210 */ 211 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); 212 if (ctl_res == NULL) { 213 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 214 if (unlikely(ctl_res == NULL)) 215 return -EINVAL; 216 } 217 218 /* 219 * And the IRQ 220 */ 221 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 222 223 return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res, 224 pp_info ? pp_info->ioport_shift : 0, 225 pio_mask, &pata_platform_sht, false); 226 } 227 228 static struct platform_driver pata_platform_driver = { 229 .probe = pata_platform_probe, 230 .remove = ata_platform_remove_one, 231 .driver = { 232 .name = DRV_NAME, 233 }, 234 }; 235 236 module_platform_driver(pata_platform_driver); 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