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_for_each_dev(dev, link, ENABLED) {
  34                ata_dev_info(dev, "configured for PIO0\n");
  35                dev->pio_mode = XFER_PIO_0;
  36                dev->xfer_mode = XFER_PIO_0;
  37                dev->xfer_shift = ATA_SHIFT_PIO;
  38                dev->flags |= ATA_DFLAG_PIO;
  39        }
  40        return 0;
  41}
  42
  43static unsigned int ixp4xx_mmio_data_xfer(struct ata_device *dev,
  44                                unsigned char *buf, unsigned int buflen, int rw)
  45{
  46        unsigned int i;
  47        unsigned int words = buflen >> 1;
  48        u16 *buf16 = (u16 *) buf;
  49        struct ata_port *ap = dev->link->ap;
  50        void __iomem *mmio = ap->ioaddr.data_addr;
  51        struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
  52
  53        /* set the expansion bus in 16bit mode and restore
  54         * 8 bit mode after the transaction.
  55         */
  56        *data->cs0_cfg &= ~(0x01);
  57        udelay(100);
  58
  59        /* Transfer multiple of 2 bytes */
  60        if (rw == READ)
  61                for (i = 0; i < words; i++)
  62                        buf16[i] = readw(mmio);
  63        else
  64                for (i = 0; i < words; i++)
  65                        writew(buf16[i], mmio);
  66
  67        /* Transfer trailing 1 byte, if any. */
  68        if (unlikely(buflen & 0x01)) {
  69                u16 align_buf[1] = { 0 };
  70                unsigned char *trailing_buf = buf + buflen - 1;
  71
  72                if (rw == READ) {
  73                        align_buf[0] = readw(mmio);
  74                        memcpy(trailing_buf, align_buf, 1);
  75                } else {
  76                        memcpy(align_buf, trailing_buf, 1);
  77                        writew(align_buf[0], mmio);
  78                }
  79                words++;
  80        }
  81
  82        udelay(100);
  83        *data->cs0_cfg |= 0x01;
  84
  85        return words << 1;
  86}
  87
  88static struct scsi_host_template ixp4xx_sht = {
  89        ATA_PIO_SHT(DRV_NAME),
  90};
  91
  92static struct ata_port_operations ixp4xx_port_ops = {
  93        .inherits               = &ata_sff_port_ops,
  94        .sff_data_xfer          = ixp4xx_mmio_data_xfer,
  95        .cable_detect           = ata_cable_40wire,
  96        .set_mode               = ixp4xx_set_mode,
  97};
  98
  99static void ixp4xx_setup_port(struct ata_port *ap,
 100                              struct ixp4xx_pata_data *data,
 101                              unsigned long raw_cs0, unsigned long raw_cs1)
 102{
 103        struct ata_ioports *ioaddr = &ap->ioaddr;
 104        unsigned long raw_cmd = raw_cs0;
 105        unsigned long raw_ctl = raw_cs1 + 0x06;
 106
 107        ioaddr->cmd_addr        = data->cs0;
 108        ioaddr->altstatus_addr  = data->cs1 + 0x06;
 109        ioaddr->ctl_addr        = data->cs1 + 0x06;
 110
 111        ata_sff_std_ports(ioaddr);
 112
 113#ifndef __ARMEB__
 114
 115        /* adjust the addresses to handle the address swizzling of the
 116         * ixp4xx in little endian mode.
 117         */
 118
 119        *(unsigned long *)&ioaddr->data_addr            ^= 0x02;
 120        *(unsigned long *)&ioaddr->cmd_addr             ^= 0x03;
 121        *(unsigned long *)&ioaddr->altstatus_addr       ^= 0x03;
 122        *(unsigned long *)&ioaddr->ctl_addr             ^= 0x03;
 123        *(unsigned long *)&ioaddr->error_addr           ^= 0x03;
 124        *(unsigned long *)&ioaddr->feature_addr         ^= 0x03;
 125        *(unsigned long *)&ioaddr->nsect_addr           ^= 0x03;
 126        *(unsigned long *)&ioaddr->lbal_addr            ^= 0x03;
 127        *(unsigned long *)&ioaddr->lbam_addr            ^= 0x03;
 128        *(unsigned long *)&ioaddr->lbah_addr            ^= 0x03;
 129        *(unsigned long *)&ioaddr->device_addr          ^= 0x03;
 130        *(unsigned long *)&ioaddr->status_addr          ^= 0x03;
 131        *(unsigned long *)&ioaddr->command_addr         ^= 0x03;
 132
 133        raw_cmd ^= 0x03;
 134        raw_ctl ^= 0x03;
 135#endif
 136
 137        ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
 138}
 139
 140static int ixp4xx_pata_probe(struct platform_device *pdev)
 141{
 142        unsigned int irq;
 143        struct resource *cs0, *cs1;
 144        struct ata_host *host;
 145        struct ata_port *ap;
 146        struct ixp4xx_pata_data *data = pdev->dev.platform_data;
 147
 148        cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 149        cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 150
 151        if (!cs0 || !cs1)
 152                return -EINVAL;
 153
 154        /* allocate host */
 155        host = ata_host_alloc(&pdev->dev, 1);
 156        if (!host)
 157                return -ENOMEM;
 158
 159        /* acquire resources and fill host */
 160        pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 161
 162        data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
 163        data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
 164
 165        if (!data->cs0 || !data->cs1)
 166                return -ENOMEM;
 167
 168        irq = platform_get_irq(pdev, 0);
 169        if (irq)
 170                irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
 171
 172        /* Setup expansion bus chip selects */
 173        *data->cs0_cfg = data->cs0_bits;
 174        *data->cs1_cfg = data->cs1_bits;
 175
 176        ap = host->ports[0];
 177
 178        ap->ops = &ixp4xx_port_ops;
 179        ap->pio_mask = ATA_PIO4;
 180        ap->flags |= ATA_FLAG_NO_ATAPI;
 181
 182        ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
 183
 184        ata_print_version_once(&pdev->dev, DRV_VERSION);
 185
 186        /* activate host */
 187        return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
 188}
 189
 190static struct platform_driver ixp4xx_pata_platform_driver = {
 191        .driver  = {
 192                .name   = DRV_NAME,
 193                .owner  = THIS_MODULE,
 194        },
 195        .probe          = ixp4xx_pata_probe,
 196        .remove         = ata_platform_remove_one,
 197};
 198
 199module_platform_driver(ixp4xx_pata_platform_driver);
 200
 201MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 202MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
 203MODULE_LICENSE("GPL");
 204MODULE_VERSION(DRV_VERSION);
 205MODULE_ALIAS("platform:" DRV_NAME);
 206
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