drivers/ata/pata_ixp4xx_cf.c

   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
  25 static 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
  39 static 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
  84 static struct scsi_host_template ixp4xx_sht = {
  85         ATA_PIO_SHT(DRV_NAME),
  86 };
  87
  88 static 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
  95 static 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
 136 static int ixp4xx_pata_probe(struct platform_device *pdev)
 137 {
 138         unsigned int irq;
 139         struct resource *cs0, *cs1;
 140         struct ata_host *host;
 141         struct ata_port *ap;
 142         struct ixp4xx_pata_data *data = dev_get_platdata(&pdev->dev);
 143         int ret;
 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)
 169                 irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
 170
 171         /* Setup expansion bus chip selects */
 172         *data->cs0_cfg = data->cs0_bits;
 173         *data->cs1_cfg = data->cs1_bits;
 174
 175         ap = host->ports[0];
 176
 177         ap->ops = &ixp4xx_port_ops;
 178         ap->pio_mask = ATA_PIO4;
 179         ap->flags |= ATA_FLAG_NO_ATAPI;
 180
 181         ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
 182
 183         ata_print_version_once(&pdev->dev, DRV_VERSION);
 184
 185         /* activate host */
 186         return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
 187 }
 188
 189 static struct platform_driver ixp4xx_pata_platform_driver = {
 190         .driver  = {
 191                 .name   = DRV_NAME,
 192         },
 193         .probe          = ixp4xx_pata_probe,
 194         .remove         = ata_platform_remove_one,
 195 };
 196
 197 module_platform_driver(ixp4xx_pata_platform_driver);
 198
 199 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 200 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
 201 MODULE_LICENSE("GPL");
 202 MODULE_VERSION(DRV_VERSION);
 203 MODULE_ALIAS("platform:" DRV_NAME);