| 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_xfer_noirq, |
| 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); |