linux/drivers/ata/pata_ixp4xx_cf.c
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   1/*
   2 * ixp4xx PATA/Compact Flash driver
   3 * Copyright (C) 2006-07 Tower Technologies
   4 * Author: Alessandro Zummo <a.zummo@towertech.it>
   5 *
   6 * An ATA driver to handle a Compact Flash connected
   7 * to the ixp4xx expansion bus in TrueIDE mode. The CF
   8 * must have it chip selects connected to two CS lines
   9 * on the ixp4xx. In the irq is not available, you might
  10 * want to modify both this driver and libata to run in
  11 * polling mode.
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License version 2 as
  15 * published by the Free Software Foundation.
  16 *
  17 */
  18
  19#include <linux/kernel.h>
  20#include <linux/module.h>
  21#include <linux/libata.h>
  22#include <linux/irq.h>
  23#include <linux/platform_device.h>
  24#include <scsi/scsi_host.h>
  25
  26#define DRV_NAME        "pata_ixp4xx_cf"
  27#define DRV_VERSION     "0.2"
  28
  29static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
  30{
  31        struct ata_device *dev;
  32
  33        ata_link_for_each_dev(dev, link) {
  34                if (ata_dev_enabled(dev)) {
  35                        ata_dev_printk(dev, KERN_INFO, "configured for PIO0\n");
  36                        dev->pio_mode = XFER_PIO_0;
  37                        dev->xfer_mode = XFER_PIO_0;
  38                        dev->xfer_shift = ATA_SHIFT_PIO;
  39                        dev->flags |= ATA_DFLAG_PIO;
  40                }
  41        }
  42        return 0;
  43}
  44
  45static unsigned int ixp4xx_mmio_data_xfer(struct ata_device *dev,
  46                                unsigned char *buf, unsigned int buflen, int rw)
  47{
  48        unsigned int i;
  49        unsigned int words = buflen >> 1;
  50        u16 *buf16 = (u16 *) buf;
  51        struct ata_port *ap = dev->link->ap;
  52        void __iomem *mmio = ap->ioaddr.data_addr;
  53        struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
  54
  55        /* set the expansion bus in 16bit mode and restore
  56         * 8 bit mode after the transaction.
  57         */
  58        *data->cs0_cfg &= ~(0x01);
  59        udelay(100);
  60
  61        /* Transfer multiple of 2 bytes */
  62        if (rw == READ)
  63                for (i = 0; i < words; i++)
  64                        buf16[i] = readw(mmio);
  65        else
  66                for (i = 0; i < words; i++)
  67                        writew(buf16[i], mmio);
  68
  69        /* Transfer trailing 1 byte, if any. */
  70        if (unlikely(buflen & 0x01)) {
  71                u16 align_buf[1] = { 0 };
  72                unsigned char *trailing_buf = buf + buflen - 1;
  73
  74                if (rw == READ) {
  75                        align_buf[0] = readw(mmio);
  76                        memcpy(trailing_buf, align_buf, 1);
  77                } else {
  78                        memcpy(align_buf, trailing_buf, 1);
  79                        writew(align_buf[0], mmio);
  80                }
  81                words++;
  82        }
  83
  84        udelay(100);
  85        *data->cs0_cfg |= 0x01;
  86
  87        return words << 1;
  88}
  89
  90static struct scsi_host_template ixp4xx_sht = {
  91        ATA_PIO_SHT(DRV_NAME),
  92};
  93
  94static struct ata_port_operations ixp4xx_port_ops = {
  95        .inherits               = &ata_sff_port_ops,
  96        .sff_data_xfer          = ixp4xx_mmio_data_xfer,
  97        .cable_detect           = ata_cable_40wire,
  98        .set_mode               = ixp4xx_set_mode,
  99};
 100
 101static void ixp4xx_setup_port(struct ata_port *ap,
 102                              struct ixp4xx_pata_data *data,
 103                              unsigned long raw_cs0, unsigned long raw_cs1)
 104{
 105        struct ata_ioports *ioaddr = &ap->ioaddr;
 106        unsigned long raw_cmd = raw_cs0;
 107        unsigned long raw_ctl = raw_cs1 + 0x06;
 108
 109        ioaddr->cmd_addr        = data->cs0;
 110        ioaddr->altstatus_addr  = data->cs1 + 0x06;
 111        ioaddr->ctl_addr        = data->cs1 + 0x06;
 112
 113        ata_sff_std_ports(ioaddr);
 114
 115#ifndef __ARMEB__
 116
 117        /* adjust the addresses to handle the address swizzling of the
 118         * ixp4xx in little endian mode.
 119         */
 120
 121        *(unsigned long *)&ioaddr->data_addr            ^= 0x02;
 122        *(unsigned long *)&ioaddr->cmd_addr             ^= 0x03;
 123        *(unsigned long *)&ioaddr->altstatus_addr       ^= 0x03;
 124        *(unsigned long *)&ioaddr->ctl_addr             ^= 0x03;
 125        *(unsigned long *)&ioaddr->error_addr           ^= 0x03;
 126        *(unsigned long *)&ioaddr->feature_addr         ^= 0x03;
 127        *(unsigned long *)&ioaddr->nsect_addr           ^= 0x03;
 128        *(unsigned long *)&ioaddr->lbal_addr            ^= 0x03;
 129        *(unsigned long *)&ioaddr->lbam_addr            ^= 0x03;
 130        *(unsigned long *)&ioaddr->lbah_addr            ^= 0x03;
 131        *(unsigned long *)&ioaddr->device_addr          ^= 0x03;
 132        *(unsigned long *)&ioaddr->status_addr          ^= 0x03;
 133        *(unsigned long *)&ioaddr->command_addr         ^= 0x03;
 134
 135        raw_cmd ^= 0x03;
 136        raw_ctl ^= 0x03;
 137#endif
 138
 139        ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
 140}
 141
 142static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
 143{
 144        unsigned int irq;
 145        struct resource *cs0, *cs1;
 146        struct ata_host *host;
 147        struct ata_port *ap;
 148        struct ixp4xx_pata_data *data = pdev->dev.platform_data;
 149
 150        cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 151        cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 152
 153        if (!cs0 || !cs1)
 154                return -EINVAL;
 155
 156        /* allocate host */
 157        host = ata_host_alloc(&pdev->dev, 1);
 158        if (!host)
 159                return -ENOMEM;
 160
 161        /* acquire resources and fill host */
 162        pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
 163
 164        data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
 165        data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
 166
 167        if (!data->cs0 || !data->cs1)
 168                return -ENOMEM;
 169
 170        irq = platform_get_irq(pdev, 0);
 171        if (irq)
 172                set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
 173
 174        /* Setup expansion bus chip selects */
 175        *data->cs0_cfg = data->cs0_bits;
 176        *data->cs1_cfg = data->cs1_bits;
 177
 178        ap = host->ports[0];
 179
 180        ap->ops = &ixp4xx_port_ops;
 181        ap->pio_mask = 0x1f; /* PIO4 */
 182        ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
 183
 184        ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
 185
 186        dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
 187
 188        /* activate host */
 189        return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
 190}
 191
 192static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
 193{
 194        struct ata_host *host = platform_get_drvdata(dev);
 195
 196        ata_host_detach(host);
 197
 198        return 0;
 199}
 200
 201static struct platform_driver ixp4xx_pata_platform_driver = {
 202        .driver  = {
 203                .name   = DRV_NAME,
 204                .owner  = THIS_MODULE,
 205        },
 206        .probe          = ixp4xx_pata_probe,
 207        .remove         = __devexit_p(ixp4xx_pata_remove),
 208};
 209
 210static int __init ixp4xx_pata_init(void)
 211{
 212        return platform_driver_register(&ixp4xx_pata_platform_driver);
 213}
 214
 215static void __exit ixp4xx_pata_exit(void)
 216{
 217        platform_driver_unregister(&ixp4xx_pata_platform_driver);
 218}
 219
 220MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 221MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
 222MODULE_LICENSE("GPL");
 223MODULE_VERSION(DRV_VERSION);
 224MODULE_ALIAS("platform:" DRV_NAME);
 225
 226module_init(ixp4xx_pata_init);
 227module_exit(ixp4xx_pata_exit);
 228