drivers/ata/pata_ixp4xx_cf.c

   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
  29 static 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_printk(dev, KERN_INFO, "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
  43 static 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
  88 static struct scsi_host_template ixp4xx_sht = {
  89         ATA_PIO_SHT(DRV_NAME),
  90 };
  91
  92 static 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
  99 static 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
 140 static __devinit 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_32BIT_MASK;
 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                 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 = 0x1f; /* PIO4 */
 180         ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
 181
 182         ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
 183
 184         dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
 185
 186         /* activate host */
 187         return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
 188 }
 189
 190 static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
 191 {
 192         struct ata_host *host = platform_get_drvdata(dev);
 193
 194         ata_host_detach(host);
 195
 196         return 0;
 197 }
 198
 199 static struct platform_driver ixp4xx_pata_platform_driver = {
 200         .driver  = {
 201                 .name   = DRV_NAME,
 202                 .owner  = THIS_MODULE,
 203         },
 204         .probe          = ixp4xx_pata_probe,
 205         .remove         = __devexit_p(ixp4xx_pata_remove),
 206 };
 207
 208 static int __init ixp4xx_pata_init(void)
 209 {
 210         return platform_driver_register(&ixp4xx_pata_platform_driver);
 211 }
 212
 213 static void __exit ixp4xx_pata_exit(void)
 214 {
 215         platform_driver_unregister(&ixp4xx_pata_platform_driver);
 216 }
 217
 218 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 219 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
 220 MODULE_LICENSE("GPL");
 221 MODULE_VERSION(DRV_VERSION);
 222 MODULE_ALIAS("platform:" DRV_NAME);
 223
 224 module_init(ixp4xx_pata_init);
 225 module_exit(ixp4xx_pata_exit);