drivers/ata/pata_ixp4xx_cf.c

   1 /*
   2  * ixp4xx PATA/Compact Flash driver
   3  * Copyright (c) 2006 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. The interrupt line is optional, if not
  10  * specified the driver will run in polling mode.
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  *
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/libata.h>
  21 #include <linux/irq.h>
  22 #include <linux/platform_device.h>
  23 #include <scsi/scsi_host.h>
  24
  25 #define DRV_NAME        "pata_ixp4xx_cf"
  26 #define DRV_VERSION     "0.1.1"
  27
  28 static void ixp4xx_set_mode(struct ata_port *ap)
  29 {
  30         int i;
  31
  32         for (i = 0; i < ATA_MAX_DEVICES; i++) {
  33                 struct ata_device *dev = &ap->device[i];
  34                 if (ata_dev_enabled(dev)) {
  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         }
  41 }
  42
  43 static void ixp4xx_phy_reset(struct ata_port *ap)
  44 {
  45         ap->cbl = ATA_CBL_PATA40;
  46         ata_port_probe(ap);
  47         ata_bus_reset(ap);
  48 }
  49
  50 static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
  51                                 unsigned int buflen, int write_data)
  52 {
  53         unsigned int i;
  54         unsigned int words = buflen >> 1;
  55         u16 *buf16 = (u16 *) buf;
  56         struct ata_port *ap = adev->ap;
  57         void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
  58         struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
  59
  60         /* set the expansion bus in 16bit mode and restore
  61          * 8 bit mode after the transaction.
  62          */
  63         *data->cs0_cfg &= ~(0x01);
  64         udelay(100);
  65
  66         /* Transfer multiple of 2 bytes */
  67         if (write_data) {
  68                 for (i = 0; i < words; i++)
  69                         writew(buf16[i], mmio);
  70         } else {
  71                 for (i = 0; i < words; i++)
  72                         buf16[i] = readw(mmio);
  73         }
  74
  75         /* Transfer trailing 1 byte, if any. */
  76         if (unlikely(buflen & 0x01)) {
  77                 u16 align_buf[1] = { 0 };
  78                 unsigned char *trailing_buf = buf + buflen - 1;
  79
  80                 if (write_data) {
  81                         memcpy(align_buf, trailing_buf, 1);
  82                         writew(align_buf[0], mmio);
  83                 } else {
  84                         align_buf[0] = readw(mmio);
  85                         memcpy(trailing_buf, align_buf, 1);
  86                 }
  87         }
  88
  89         udelay(100);
  90         *data->cs0_cfg |= 0x01;
  91 }
  92
  93 static void ixp4xx_irq_clear(struct ata_port *ap)
  94 {
  95 }
  96
  97 static void ixp4xx_host_stop (struct ata_host *host)
  98 {
  99         struct ixp4xx_pata_data *data = host->dev->platform_data;
 100
 101         iounmap(data->cs0);
 102         iounmap(data->cs1);
 103 }
 104
 105 static struct scsi_host_template ixp4xx_sht = {
 106         .module                 = THIS_MODULE,
 107         .name                   = DRV_NAME,
 108         .ioctl                  = ata_scsi_ioctl,
 109         .queuecommand           = ata_scsi_queuecmd,
 110         .can_queue              = ATA_DEF_QUEUE,
 111         .this_id                = ATA_SHT_THIS_ID,
 112         .sg_tablesize           = LIBATA_MAX_PRD,
 113         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 114         .emulated               = ATA_SHT_EMULATED,
 115         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 116         .proc_name              = DRV_NAME,
 117         .dma_boundary           = ATA_DMA_BOUNDARY,
 118         .slave_configure        = ata_scsi_slave_config,
 119         .slave_destroy          = ata_scsi_slave_destroy,
 120         .bios_param             = ata_std_bios_param,
 121 };
 122
 123 static struct ata_port_operations ixp4xx_port_ops = {
 124         .set_mode       = ixp4xx_set_mode,
 125         .mode_filter    = ata_pci_default_filter,
 126
 127         .port_disable   = ata_port_disable,
 128         .tf_load        = ata_tf_load,
 129         .tf_read        = ata_tf_read,
 130         .check_status   = ata_check_status,
 131         .exec_command   = ata_exec_command,
 132         .dev_select     = ata_std_dev_select,
 133
 134         .qc_prep        = ata_qc_prep,
 135         .qc_issue       = ata_qc_issue_prot,
 136         .eng_timeout    = ata_eng_timeout,
 137         .data_xfer      = ixp4xx_mmio_data_xfer,
 138
 139         .irq_handler    = ata_interrupt,
 140         .irq_clear      = ixp4xx_irq_clear,
 141
 142         .port_start     = ata_port_start,
 143         .port_stop      = ata_port_stop,
 144         .host_stop      = ixp4xx_host_stop,
 145
 146         .phy_reset      = ixp4xx_phy_reset,
 147 };
 148
 149 static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
 150                                 struct ixp4xx_pata_data *data)
 151 {
 152         ioaddr->cmd_addr        = (unsigned long) data->cs0;
 153         ioaddr->altstatus_addr  = (unsigned long) data->cs1 + 0x06;
 154         ioaddr->ctl_addr        = (unsigned long) data->cs1 + 0x06;
 155
 156         ata_std_ports(ioaddr);
 157
 158 #ifndef __ARMEB__
 159
 160         /* adjust the addresses to handle the address swizzling of the
 161          * ixp4xx in little endian mode.
 162          */
 163
 164         ioaddr->data_addr       ^= 0x02;
 165         ioaddr->cmd_addr        ^= 0x03;
 166         ioaddr->altstatus_addr  ^= 0x03;
 167         ioaddr->ctl_addr        ^= 0x03;
 168         ioaddr->error_addr      ^= 0x03;
 169         ioaddr->feature_addr    ^= 0x03;
 170         ioaddr->nsect_addr      ^= 0x03;
 171         ioaddr->lbal_addr       ^= 0x03;
 172         ioaddr->lbam_addr       ^= 0x03;
 173         ioaddr->lbah_addr       ^= 0x03;
 174         ioaddr->device_addr     ^= 0x03;
 175         ioaddr->status_addr     ^= 0x03;
 176         ioaddr->command_addr    ^= 0x03;
 177 #endif
 178 }
 179
 180 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
 181 {
 182         int ret;
 183         unsigned int irq;
 184         struct resource *cs0, *cs1;
 185         struct ata_probe_ent ae;
 186
 187         struct ixp4xx_pata_data *data = pdev->dev.platform_data;
 188
 189         cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 190         cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 191
 192         if (!cs0 || !cs1)
 193                 return -EINVAL;
 194
 195         pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
 196
 197         data->cs0 = ioremap(cs0->start, 0x1000);
 198         data->cs1 = ioremap(cs1->start, 0x1000);
 199
 200         irq = platform_get_irq(pdev, 0);
 201         if (irq)
 202                 set_irq_type(irq, IRQT_HIGH);
 203
 204         /* Setup expansion bus chip selects */
 205         *data->cs0_cfg = data->cs0_bits;
 206         *data->cs1_cfg = data->cs1_bits;
 207
 208         memset(&ae, 0, sizeof(struct ata_probe_ent));
 209         INIT_LIST_HEAD(&ae.node);
 210
 211         ae.dev          = &pdev->dev;
 212         ae.port_ops     = &ixp4xx_port_ops;
 213         ae.sht          = &ixp4xx_sht;
 214         ae.n_ports      = 1;
 215         ae.pio_mask     = 0x1f; /* PIO4 */
 216         ae.irq          = irq;
 217         ae.irq_flags    = 0;
 218         ae.port_flags   = ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY
 219                         | ATA_FLAG_NO_ATAPI | ATA_FLAG_SRST;
 220
 221         /* run in polling mode if no irq has been assigned */
 222         if (!irq)
 223                 ae.port_flags |= ATA_FLAG_PIO_POLLING;
 224
 225         ixp4xx_setup_port(&ae.port[0], data);
 226
 227         dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
 228
 229         ret = ata_device_add(&ae);
 230         if (ret == 0)
 231                 return -ENODEV;
 232
 233         return 0;
 234 }
 235
 236 static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
 237 {
 238         struct ata_host *host = platform_get_drvdata(dev);
 239
 240         ata_host_remove(host);
 241         platform_set_drvdata(dev, NULL);
 242
 243         return 0;
 244 }
 245
 246 static struct platform_driver ixp4xx_pata_platform_driver = {
 247         .driver  = {
 248                 .name   = DRV_NAME,
 249                 .owner  = THIS_MODULE,
 250         },
 251         .probe          = ixp4xx_pata_probe,
 252         .remove         = __devexit_p(ixp4xx_pata_remove),
 253 };
 254
 255 static int __init ixp4xx_pata_init(void)
 256 {
 257         return platform_driver_register(&ixp4xx_pata_platform_driver);
 258 }
 259
 260 static void __exit ixp4xx_pata_exit(void)
 261 {
 262         platform_driver_unregister(&ixp4xx_pata_platform_driver);
 263 }
 264
 265 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 266 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
 267 MODULE_LICENSE("GPL");
 268 MODULE_VERSION(DRV_VERSION);
 269
 270 module_init(ixp4xx_pata_init);
 271 module_exit(ixp4xx_pata_exit);