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1/*2 * Generic platform device PATA driver3 *4 * Copyright (C) 2006 - 2007 Paul Mundt5 *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 Public11 * License. See the file "COPYING" in the main directory of this archive12 * 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 26static int pio_mask = 1;27module_param(pio_mask, int, 0);28MODULE_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 has32 * already been configured..33 */34static 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 48static const struct scsi_host_template pata_platform_sht = {49 ATA_PIO_SHT(DRV_NAME),50};51 52static 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 interface70 * @dev: device71 * @io_res: Resource representing I/O base72 * @ctl_res: Resource representing CTL base73 * @irq_res: Resource representing IRQ and its flags74 * @ioport_shift: I/O port shift75 * @__pio_mask: PIO mask76 * @sht: scsi_host_template to use when registering77 * @use16bit: Flag to indicate 16-bit IO instead of 32-bit78 *79 * Register a platform bus IDE interface. Such interfaces are PIO and we80 * 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 handled92 * here. For IORESOURCE_IO, it's assumed that there's no remapping93 * necessary.94 *95 * If no IRQ resource is present, PIO polling mode is used instead.96 */97int __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 const 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 MMIO110 */111 mmio = (( io_res->flags == IORESOURCE_MEM) &&112 (ctl_res->flags == IORESOURCE_MEM));113 114 /*115 * And the IRQ116 */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 if (!ap->ops)132 return -ENOMEM;133 ap->ops->inherits = &ata_sff_port_ops;134 ap->ops->cable_detect = ata_cable_unknown;135 ap->ops->set_mode = pata_platform_set_mode;136 if (use16bit)137 ap->ops->sff_data_xfer = ata_sff_data_xfer;138 else139 ap->ops->sff_data_xfer = ata_sff_data_xfer32;140 141 ap->pio_mask = __pio_mask;142 ap->flags |= ATA_FLAG_SLAVE_POSS;143 144 /*145 * Use polling mode if there's no IRQ146 */147 if (!irq) {148 ap->flags |= ATA_FLAG_PIO_POLLING;149 ata_port_desc(ap, "no IRQ, using PIO polling");150 }151 152 /*153 * Handle the MMIO case154 */155 if (mmio) {156 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,157 resource_size(io_res));158 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,159 resource_size(ctl_res));160 } else {161 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,162 resource_size(io_res));163 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,164 resource_size(ctl_res));165 }166 if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {167 dev_err(dev, "failed to map IO/CTL base\n");168 return -ENOMEM;169 }170 171 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;172 173 pata_platform_setup_port(&ap->ioaddr, ioport_shift);174 175 ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",176 (unsigned long long)io_res->start,177 (unsigned long long)ctl_res->start);178 179 /* activate */180 return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,181 irq_flags, sht);182}183EXPORT_SYMBOL_GPL(__pata_platform_probe);184 185static int pata_platform_probe(struct platform_device *pdev)186{187 struct resource *io_res;188 struct resource *ctl_res;189 struct resource *irq_res;190 struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);191 192 /*193 * Simple resource validation ..194 */195 if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {196 dev_err(&pdev->dev, "invalid number of resources\n");197 return -EINVAL;198 }199 200 /*201 * Get the I/O base first202 */203 io_res = platform_get_mem_or_io(pdev, 0);204 if (!io_res)205 return -EINVAL;206 207 /*208 * Then the CTL base209 */210 ctl_res = platform_get_mem_or_io(pdev, 1);211 if (!ctl_res)212 return -EINVAL;213 214 /*215 * And the IRQ216 */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, false);222}223 224static struct platform_driver pata_platform_driver = {225 .probe = pata_platform_probe,226 .remove_new = ata_platform_remove_one,227 .driver = {228 .name = DRV_NAME,229 },230};231 232module_platform_driver(pata_platform_driver);233 234MODULE_AUTHOR("Paul Mundt");235MODULE_DESCRIPTION("low-level driver for platform device ATA");236MODULE_LICENSE("GPL");237MODULE_VERSION(DRV_VERSION);238MODULE_ALIAS("platform:" DRV_NAME);239