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 void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
  46                                 unsigned int buflen, int write_data)
  47 {
  48         unsigned int i;
  49         unsigned int words = buflen >> 1;
  50         u16 *buf16 = (u16 *) buf;
  51         struct ata_port *ap = adev->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 (write_data) {
  63                 for (i = 0; i < words; i++)
  64                         writew(buf16[i], mmio);
  65         } else {
  66                 for (i = 0; i < words; i++)
  67                         buf16[i] = readw(mmio);
  68         }
  69
  70         /* Transfer trailing 1 byte, if any. */
  71         if (unlikely(buflen & 0x01)) {
  72                 u16 align_buf[1] = { 0 };
  73                 unsigned char *trailing_buf = buf + buflen - 1;
  74
  75                 if (write_data) {
  76                         memcpy(align_buf, trailing_buf, 1);
  77                         writew(align_buf[0], mmio);
  78                 } else {
  79                         align_buf[0] = readw(mmio);
  80                         memcpy(trailing_buf, align_buf, 1);
  81                 }
  82         }
  83
  84         udelay(100);
  85         *data->cs0_cfg |= 0x01;
  86 }
  87
  88 static struct scsi_host_template ixp4xx_sht = {
  89         .module                 = THIS_MODULE,
  90         .name                   = DRV_NAME,
  91         .ioctl                  = ata_scsi_ioctl,
  92         .queuecommand           = ata_scsi_queuecmd,
  93         .can_queue              = ATA_DEF_QUEUE,
  94         .this_id                = ATA_SHT_THIS_ID,
  95         .sg_tablesize           = LIBATA_MAX_PRD,
  96         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
  97         .emulated               = ATA_SHT_EMULATED,
  98         .use_clustering         = ATA_SHT_USE_CLUSTERING,
  99         .proc_name              = DRV_NAME,
 100         .dma_boundary           = ATA_DMA_BOUNDARY,
 101         .slave_configure        = ata_scsi_slave_config,
 102         .slave_destroy          = ata_scsi_slave_destroy,
 103         .bios_param             = ata_std_bios_param,
 104 };
 105
 106 static struct ata_port_operations ixp4xx_port_ops = {
 107         .set_mode               = ixp4xx_set_mode,
 108         .mode_filter            = ata_pci_default_filter,
 109
 110         .tf_load                = ata_tf_load,
 111         .tf_read                = ata_tf_read,
 112         .exec_command           = ata_exec_command,
 113         .check_status           = ata_check_status,
 114         .dev_select             = ata_std_dev_select,
 115
 116         .freeze                 = ata_bmdma_freeze,
 117         .thaw                   = ata_bmdma_thaw,
 118         .error_handler          = ata_bmdma_error_handler,
 119         .post_internal_cmd      = ata_bmdma_post_internal_cmd,
 120
 121         .qc_prep                = ata_qc_prep,
 122         .qc_issue               = ata_qc_issue_prot,
 123         .data_xfer              = ixp4xx_mmio_data_xfer,
 124         .cable_detect           = ata_cable_40wire,
 125
 126         .irq_handler            = ata_interrupt,
 127         .irq_clear              = ata_bmdma_irq_clear,
 128         .irq_on                 = ata_irq_on,
 129
 130         .port_start             = ata_port_start,
 131 };
 132
 133 static void ixp4xx_setup_port(struct ata_port *ap,
 134                               struct ixp4xx_pata_data *data,
 135                               unsigned long raw_cs0, unsigned long raw_cs1)
 136 {
 137         struct ata_ioports *ioaddr = &ap->ioaddr;
 138         unsigned long raw_cmd = raw_cs0;
 139         unsigned long raw_ctl = raw_cs1 + 0x06;
 140
 141         ioaddr->cmd_addr        = data->cs0;
 142         ioaddr->altstatus_addr  = data->cs1 + 0x06;
 143         ioaddr->ctl_addr        = data->cs1 + 0x06;
 144
 145         ata_std_ports(ioaddr);
 146
 147 #ifndef __ARMEB__
 148
 149         /* adjust the addresses to handle the address swizzling of the
 150          * ixp4xx in little endian mode.
 151          */
 152
 153         *(unsigned long *)&ioaddr->data_addr            ^= 0x02;
 154         *(unsigned long *)&ioaddr->cmd_addr             ^= 0x03;
 155         *(unsigned long *)&ioaddr->altstatus_addr       ^= 0x03;
 156         *(unsigned long *)&ioaddr->ctl_addr             ^= 0x03;
 157         *(unsigned long *)&ioaddr->error_addr           ^= 0x03;
 158         *(unsigned long *)&ioaddr->feature_addr         ^= 0x03;
 159         *(unsigned long *)&ioaddr->nsect_addr           ^= 0x03;
 160         *(unsigned long *)&ioaddr->lbal_addr            ^= 0x03;
 161         *(unsigned long *)&ioaddr->lbam_addr            ^= 0x03;
 162         *(unsigned long *)&ioaddr->lbah_addr            ^= 0x03;
 163         *(unsigned long *)&ioaddr->device_addr          ^= 0x03;
 164         *(unsigned long *)&ioaddr->status_addr          ^= 0x03;
 165         *(unsigned long *)&ioaddr->command_addr         ^= 0x03;
 166
 167         raw_cmd ^= 0x03;
 168         raw_ctl ^= 0x03;
 169 #endif
 170
 171         ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
 172 }
 173
 174 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
 175 {
 176         unsigned int irq;
 177         struct resource *cs0, *cs1;
 178         struct ata_host *host;
 179         struct ata_port *ap;
 180         struct ixp4xx_pata_data *data = pdev->dev.platform_data;
 181
 182         cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 183         cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 184
 185         if (!cs0 || !cs1)
 186                 return -EINVAL;
 187
 188         /* allocate host */
 189         host = ata_host_alloc(&pdev->dev, 1);
 190         if (!host)
 191                 return -ENOMEM;
 192
 193         /* acquire resources and fill host */
 194         pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
 195
 196         data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
 197         data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
 198
 199         if (!data->cs0 || !data->cs1)
 200                 return -ENOMEM;
 201
 202         irq = platform_get_irq(pdev, 0);
 203         if (irq)
 204                 set_irq_type(irq, IRQT_RISING);
 205
 206         /* Setup expansion bus chip selects */
 207         *data->cs0_cfg = data->cs0_bits;
 208         *data->cs1_cfg = data->cs1_bits;
 209
 210         ap = host->ports[0];
 211
 212         ap->ops = &ixp4xx_port_ops;
 213         ap->pio_mask = 0x1f; /* PIO4 */
 214         ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
 215
 216         ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
 217
 218         dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
 219
 220         /* activate host */
 221         return ata_host_activate(host, irq, ata_interrupt, 0, &ixp4xx_sht);
 222 }
 223
 224 static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
 225 {
 226         struct ata_host *host = platform_get_drvdata(dev);
 227
 228         ata_host_detach(host);
 229
 230         return 0;
 231 }
 232
 233 static struct platform_driver ixp4xx_pata_platform_driver = {
 234         .driver  = {
 235                 .name   = DRV_NAME,
 236                 .owner  = THIS_MODULE,
 237         },
 238         .probe          = ixp4xx_pata_probe,
 239         .remove         = __devexit_p(ixp4xx_pata_remove),
 240 };
 241
 242 static int __init ixp4xx_pata_init(void)
 243 {
 244         return platform_driver_register(&ixp4xx_pata_platform_driver);
 245 }
 246
 247 static void __exit ixp4xx_pata_exit(void)
 248 {
 249         platform_driver_unregister(&ixp4xx_pata_platform_driver);
 250 }
 251
 252 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 253 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
 254 MODULE_LICENSE("GPL");
 255 MODULE_VERSION(DRV_VERSION);
 256
 257 module_init(ixp4xx_pata_init);
 258 module_exit(ixp4xx_pata_exit);