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_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
  45 static 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
  90 static struct scsi_host_template ixp4xx_sht = {
  91         .module                 = THIS_MODULE,
  92         .name                   = DRV_NAME,
  93         .ioctl                  = ata_scsi_ioctl,
  94         .queuecommand           = ata_scsi_queuecmd,
  95         .can_queue              = ATA_DEF_QUEUE,
  96         .this_id                = ATA_SHT_THIS_ID,
  97         .sg_tablesize           = LIBATA_MAX_PRD,
  98         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
  99         .emulated               = ATA_SHT_EMULATED,
 100         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 101         .proc_name              = DRV_NAME,
 102         .dma_boundary           = ATA_DMA_BOUNDARY,
 103         .slave_configure        = ata_scsi_slave_config,
 104         .slave_destroy          = ata_scsi_slave_destroy,
 105         .bios_param             = ata_std_bios_param,
 106 };
 107
 108 static struct ata_port_operations ixp4xx_port_ops = {
 109         .set_mode               = ixp4xx_set_mode,
 110         .mode_filter            = ata_pci_default_filter,
 111
 112         .tf_load                = ata_tf_load,
 113         .tf_read                = ata_tf_read,
 114         .exec_command           = ata_exec_command,
 115         .check_status           = ata_check_status,
 116         .dev_select             = ata_std_dev_select,
 117
 118         .freeze                 = ata_bmdma_freeze,
 119         .thaw                   = ata_bmdma_thaw,
 120         .error_handler          = ata_bmdma_error_handler,
 121         .post_internal_cmd      = ata_bmdma_post_internal_cmd,
 122
 123         .qc_prep                = ata_qc_prep,
 124         .qc_issue               = ata_qc_issue_prot,
 125         .data_xfer              = ixp4xx_mmio_data_xfer,
 126         .cable_detect           = ata_cable_40wire,
 127
 128         .irq_handler            = ata_interrupt,
 129         .irq_clear              = ata_bmdma_irq_clear,
 130         .irq_on                 = ata_irq_on,
 131
 132         .port_start             = ata_port_start,
 133 };
 134
 135 static void ixp4xx_setup_port(struct ata_port *ap,
 136                               struct ixp4xx_pata_data *data,
 137                               unsigned long raw_cs0, unsigned long raw_cs1)
 138 {
 139         struct ata_ioports *ioaddr = &ap->ioaddr;
 140         unsigned long raw_cmd = raw_cs0;
 141         unsigned long raw_ctl = raw_cs1 + 0x06;
 142
 143         ioaddr->cmd_addr        = data->cs0;
 144         ioaddr->altstatus_addr  = data->cs1 + 0x06;
 145         ioaddr->ctl_addr        = data->cs1 + 0x06;
 146
 147         ata_std_ports(ioaddr);
 148
 149 #ifndef __ARMEB__
 150
 151         /* adjust the addresses to handle the address swizzling of the
 152          * ixp4xx in little endian mode.
 153          */
 154
 155         *(unsigned long *)&ioaddr->data_addr            ^= 0x02;
 156         *(unsigned long *)&ioaddr->cmd_addr             ^= 0x03;
 157         *(unsigned long *)&ioaddr->altstatus_addr       ^= 0x03;
 158         *(unsigned long *)&ioaddr->ctl_addr             ^= 0x03;
 159         *(unsigned long *)&ioaddr->error_addr           ^= 0x03;
 160         *(unsigned long *)&ioaddr->feature_addr         ^= 0x03;
 161         *(unsigned long *)&ioaddr->nsect_addr           ^= 0x03;
 162         *(unsigned long *)&ioaddr->lbal_addr            ^= 0x03;
 163         *(unsigned long *)&ioaddr->lbam_addr            ^= 0x03;
 164         *(unsigned long *)&ioaddr->lbah_addr            ^= 0x03;
 165         *(unsigned long *)&ioaddr->device_addr          ^= 0x03;
 166         *(unsigned long *)&ioaddr->status_addr          ^= 0x03;
 167         *(unsigned long *)&ioaddr->command_addr         ^= 0x03;
 168
 169         raw_cmd ^= 0x03;
 170         raw_ctl ^= 0x03;
 171 #endif
 172
 173         ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
 174 }
 175
 176 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
 177 {
 178         unsigned int irq;
 179         struct resource *cs0, *cs1;
 180         struct ata_host *host;
 181         struct ata_port *ap;
 182         struct ixp4xx_pata_data *data = pdev->dev.platform_data;
 183
 184         cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 185         cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 186
 187         if (!cs0 || !cs1)
 188                 return -EINVAL;
 189
 190         /* allocate host */
 191         host = ata_host_alloc(&pdev->dev, 1);
 192         if (!host)
 193                 return -ENOMEM;
 194
 195         /* acquire resources and fill host */
 196         pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
 197
 198         data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
 199         data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
 200
 201         if (!data->cs0 || !data->cs1)
 202                 return -ENOMEM;
 203
 204         irq = platform_get_irq(pdev, 0);
 205         if (irq)
 206                 set_irq_type(irq, IRQT_RISING);
 207
 208         /* Setup expansion bus chip selects */
 209         *data->cs0_cfg = data->cs0_bits;
 210         *data->cs1_cfg = data->cs1_bits;
 211
 212         ap = host->ports[0];
 213
 214         ap->ops = &ixp4xx_port_ops;
 215         ap->pio_mask = 0x1f; /* PIO4 */
 216         ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
 217
 218         ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
 219
 220         dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
 221
 222         /* activate host */
 223         return ata_host_activate(host, irq, ata_interrupt, 0, &ixp4xx_sht);
 224 }
 225
 226 static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
 227 {
 228         struct ata_host *host = platform_get_drvdata(dev);
 229
 230         ata_host_detach(host);
 231
 232         return 0;
 233 }
 234
 235 static struct platform_driver ixp4xx_pata_platform_driver = {
 236         .driver  = {
 237                 .name   = DRV_NAME,
 238                 .owner  = THIS_MODULE,
 239         },
 240         .probe          = ixp4xx_pata_probe,
 241         .remove         = __devexit_p(ixp4xx_pata_remove),
 242 };
 243
 244 static int __init ixp4xx_pata_init(void)
 245 {
 246         return platform_driver_register(&ixp4xx_pata_platform_driver);
 247 }
 248
 249 static void __exit ixp4xx_pata_exit(void)
 250 {
 251         platform_driver_unregister(&ixp4xx_pata_platform_driver);
 252 }
 253
 254 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 255 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
 256 MODULE_LICENSE("GPL");
 257 MODULE_VERSION(DRV_VERSION);
 258
 259 module_init(ixp4xx_pata_init);
 260 module_exit(ixp4xx_pata_exit);