linux/drivers/ata/pata_ixp4xx_cf.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * ixp4xx PATA/Compact Flash driver
   4 * Copyright (C) 2006-07 Tower Technologies
   5 * Author: Alessandro Zummo <a.zummo@towertech.it>
   6 *
   7 * An ATA driver to handle a Compact Flash connected
   8 * to the ixp4xx expansion bus in TrueIDE mode. The CF
   9 * must have it chip selects connected to two CS lines
  10 * on the ixp4xx. In the irq is not available, you might
  11 * want to modify both this driver and libata to run in
  12 * polling mode.
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/module.h>
  17#include <linux/libata.h>
  18#include <linux/irq.h>
  19#include <linux/platform_device.h>
  20#include <scsi/scsi_host.h>
  21
  22#define DRV_NAME        "pata_ixp4xx_cf"
  23#define DRV_VERSION     "0.2"
  24
  25static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
  26{
  27        struct ata_device *dev;
  28
  29        ata_for_each_dev(dev, link, ENABLED) {
  30                ata_dev_info(dev, "configured for PIO0\n");
  31                dev->pio_mode = XFER_PIO_0;
  32                dev->xfer_mode = XFER_PIO_0;
  33                dev->xfer_shift = ATA_SHIFT_PIO;
  34                dev->flags |= ATA_DFLAG_PIO;
  35        }
  36        return 0;
  37}
  38
  39static unsigned int ixp4xx_mmio_data_xfer(struct ata_queued_cmd *qc,
  40                                unsigned char *buf, unsigned int buflen, int rw)
  41{
  42        unsigned int i;
  43        unsigned int words = buflen >> 1;
  44        u16 *buf16 = (u16 *) buf;
  45        struct ata_port *ap = qc->dev->link->ap;
  46        void __iomem *mmio = ap->ioaddr.data_addr;
  47        struct ixp4xx_pata_data *data = dev_get_platdata(ap->host->dev);
  48
  49        /* set the expansion bus in 16bit mode and restore
  50         * 8 bit mode after the transaction.
  51         */
  52        *data->cs0_cfg &= ~(0x01);
  53        udelay(100);
  54
  55        /* Transfer multiple of 2 bytes */
  56        if (rw == READ)
  57                for (i = 0; i < words; i++)
  58                        buf16[i] = readw(mmio);
  59        else
  60                for (i = 0; i < words; i++)
  61                        writew(buf16[i], mmio);
  62
  63        /* Transfer trailing 1 byte, if any. */
  64        if (unlikely(buflen & 0x01)) {
  65                u16 align_buf[1] = { 0 };
  66                unsigned char *trailing_buf = buf + buflen - 1;
  67
  68                if (rw == READ) {
  69                        align_buf[0] = readw(mmio);
  70                        memcpy(trailing_buf, align_buf, 1);
  71                } else {
  72                        memcpy(align_buf, trailing_buf, 1);
  73                        writew(align_buf[0], mmio);
  74                }
  75                words++;
  76        }
  77
  78        udelay(100);
  79        *data->cs0_cfg |= 0x01;
  80
  81        return words << 1;
  82}
  83
  84static struct scsi_host_template ixp4xx_sht = {
  85        ATA_PIO_SHT(DRV_NAME),
  86};
  87
  88static struct ata_port_operations ixp4xx_port_ops = {
  89        .inherits               = &ata_sff_port_ops,
  90        .sff_data_xfer          = ixp4xx_mmio_data_xfer,
  91        .cable_detect           = ata_cable_40wire,
  92        .set_mode               = ixp4xx_set_mode,
  93};
  94
  95static void ixp4xx_setup_port(struct ata_port *ap,
  96                              struct ixp4xx_pata_data *data,
  97                              unsigned long raw_cs0, unsigned long raw_cs1)
  98{
  99        struct ata_ioports *ioaddr = &ap->ioaddr;
 100        unsigned long raw_cmd = raw_cs0;
 101        unsigned long raw_ctl = raw_cs1 + 0x06;
 102
 103        ioaddr->cmd_addr        = data->cs0;
 104        ioaddr->altstatus_addr  = data->cs1 + 0x06;
 105        ioaddr->ctl_addr        = data->cs1 + 0x06;
 106
 107        ata_sff_std_ports(ioaddr);
 108
 109#ifndef __ARMEB__
 110
 111        /* adjust the addresses to handle the address swizzling of the
 112         * ixp4xx in little endian mode.
 113         */
 114
 115        *(unsigned long *)&ioaddr->data_addr            ^= 0x02;
 116        *(unsigned long *)&ioaddr->cmd_addr             ^= 0x03;
 117        *(unsigned long *)&ioaddr->altstatus_addr       ^= 0x03;
 118        *(unsigned long *)&ioaddr->ctl_addr             ^= 0x03;
 119        *(unsigned long *)&ioaddr->error_addr           ^= 0x03;
 120        *(unsigned long *)&ioaddr->feature_addr         ^= 0x03;
 121        *(unsigned long *)&ioaddr->nsect_addr           ^= 0x03;
 122        *(unsigned long *)&ioaddr->lbal_addr            ^= 0x03;
 123        *(unsigned long *)&ioaddr->lbam_addr            ^= 0x03;
 124        *(unsigned long *)&ioaddr->lbah_addr            ^= 0x03;
 125        *(unsigned long *)&ioaddr->device_addr          ^= 0x03;
 126        *(unsigned long *)&ioaddr->status_addr          ^= 0x03;
 127        *(unsigned long *)&ioaddr->command_addr         ^= 0x03;
 128
 129        raw_cmd ^= 0x03;
 130        raw_ctl ^= 0x03;
 131#endif
 132
 133        ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
 134}
 135
 136static int ixp4xx_pata_probe(struct platform_device *pdev)
 137{
 138        struct resource *cs0, *cs1;
 139        struct ata_host *host;
 140        struct ata_port *ap;
 141        struct ixp4xx_pata_data *data = dev_get_platdata(&pdev->dev);
 142        int ret;
 143        int irq;
 144
 145        cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 146        cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 147
 148        if (!cs0 || !cs1)
 149                return -EINVAL;
 150
 151        /* allocate host */
 152        host = ata_host_alloc(&pdev->dev, 1);
 153        if (!host)
 154                return -ENOMEM;
 155
 156        /* acquire resources and fill host */
 157        ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 158        if (ret)
 159                return ret;
 160
 161        data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
 162        data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
 163
 164        if (!data->cs0 || !data->cs1)
 165                return -ENOMEM;
 166
 167        irq = platform_get_irq(pdev, 0);
 168        if (irq > 0)
 169                irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
 170        else if (irq < 0)
 171                return irq;
 172        else
 173                return -EINVAL;
 174
 175        /* Setup expansion bus chip selects */
 176        *data->cs0_cfg = data->cs0_bits;
 177        *data->cs1_cfg = data->cs1_bits;
 178
 179        ap = host->ports[0];
 180
 181        ap->ops = &ixp4xx_port_ops;
 182        ap->pio_mask = ATA_PIO4;
 183        ap->flags |= ATA_FLAG_NO_ATAPI;
 184
 185        ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
 186
 187        ata_print_version_once(&pdev->dev, DRV_VERSION);
 188
 189        /* activate host */
 190        return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
 191}
 192
 193static struct platform_driver ixp4xx_pata_platform_driver = {
 194        .driver  = {
 195                .name   = DRV_NAME,
 196        },
 197        .probe          = ixp4xx_pata_probe,
 198        .remove         = ata_platform_remove_one,
 199};
 200
 201module_platform_driver(ixp4xx_pata_platform_driver);
 202
 203MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 204MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
 205MODULE_LICENSE("GPL");
 206MODULE_VERSION(DRV_VERSION);
 207MODULE_ALIAS("platform:" DRV_NAME);
 208