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     "0.1.1ac1"
  27
  28 static int ixp4xx_set_mode(struct ata_port *ap, struct ata_device *adev)
  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         return 0;
  42 }
  43
  44 static void ixp4xx_phy_reset(struct ata_port *ap)
  45 {
  46         ap->cbl = ATA_CBL_PATA40;
  47         ata_port_probe(ap);
  48         ata_bus_reset(ap);
  49 }
  50
  51 static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
  52                                 unsigned int buflen, int write_data)
  53 {
  54         unsigned int i;
  55         unsigned int words = buflen >> 1;
  56         u16 *buf16 = (u16 *) buf;
  57         struct ata_port *ap = adev->ap;
  58         void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
  59         struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
  60
  61         /* set the expansion bus in 16bit mode and restore
  62          * 8 bit mode after the transaction.
  63          */
  64         *data->cs0_cfg &= ~(0x01);
  65         udelay(100);
  66
  67         /* Transfer multiple of 2 bytes */
  68         if (write_data) {
  69                 for (i = 0; i < words; i++)
  70                         writew(buf16[i], mmio);
  71         } else {
  72                 for (i = 0; i < words; i++)
  73                         buf16[i] = readw(mmio);
  74         }
  75
  76         /* Transfer trailing 1 byte, if any. */
  77         if (unlikely(buflen & 0x01)) {
  78                 u16 align_buf[1] = { 0 };
  79                 unsigned char *trailing_buf = buf + buflen - 1;
  80
  81                 if (write_data) {
  82                         memcpy(align_buf, trailing_buf, 1);
  83                         writew(align_buf[0], mmio);
  84                 } else {
  85                         align_buf[0] = readw(mmio);
  86                         memcpy(trailing_buf, align_buf, 1);
  87                 }
  88         }
  89
  90         udelay(100);
  91         *data->cs0_cfg |= 0x01;
  92 }
  93
  94 static void ixp4xx_irq_clear(struct ata_port *ap)
  95 {
  96 }
  97
  98 static struct scsi_host_template ixp4xx_sht = {
  99         .module                 = THIS_MODULE,
 100         .name                   = DRV_NAME,
 101         .ioctl                  = ata_scsi_ioctl,
 102         .queuecommand           = ata_scsi_queuecmd,
 103         .can_queue              = ATA_DEF_QUEUE,
 104         .this_id                = ATA_SHT_THIS_ID,
 105         .sg_tablesize           = LIBATA_MAX_PRD,
 106         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 107         .emulated               = ATA_SHT_EMULATED,
 108         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 109         .proc_name              = DRV_NAME,
 110         .dma_boundary           = ATA_DMA_BOUNDARY,
 111         .slave_configure        = ata_scsi_slave_config,
 112         .slave_destroy          = ata_scsi_slave_destroy,
 113         .bios_param             = ata_std_bios_param,
 114 };
 115
 116 static struct ata_port_operations ixp4xx_port_ops = {
 117         .set_mode       = ixp4xx_set_mode,
 118         .mode_filter    = ata_pci_default_filter,
 119
 120         .port_disable   = ata_port_disable,
 121         .tf_load        = ata_tf_load,
 122         .tf_read        = ata_tf_read,
 123         .check_status   = ata_check_status,
 124         .exec_command   = ata_exec_command,
 125         .dev_select     = ata_std_dev_select,
 126
 127         .qc_prep        = ata_qc_prep,
 128         .qc_issue       = ata_qc_issue_prot,
 129         .eng_timeout    = ata_eng_timeout,
 130         .data_xfer      = ixp4xx_mmio_data_xfer,
 131
 132         .irq_handler    = ata_interrupt,
 133         .irq_clear      = ixp4xx_irq_clear,
 134         .irq_on         = ata_irq_on,
 135         .irq_ack        = ata_irq_ack,
 136
 137         .port_start     = ata_port_start,
 138
 139         .phy_reset      = ixp4xx_phy_reset,
 140 };
 141
 142 static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
 143                                 struct ixp4xx_pata_data *data)
 144 {
 145         ioaddr->cmd_addr        = data->cs0;
 146         ioaddr->altstatus_addr  = data->cs1 + 0x06;
 147         ioaddr->ctl_addr        = data->cs1 + 0x06;
 148
 149         ata_std_ports(ioaddr);
 150
 151 #ifndef __ARMEB__
 152
 153         /* adjust the addresses to handle the address swizzling of the
 154          * ixp4xx in little endian mode.
 155          */
 156
 157         *(unsigned long *)&ioaddr->data_addr            ^= 0x02;
 158         *(unsigned long *)&ioaddr->cmd_addr             ^= 0x03;
 159         *(unsigned long *)&ioaddr->altstatus_addr       ^= 0x03;
 160         *(unsigned long *)&ioaddr->ctl_addr             ^= 0x03;
 161         *(unsigned long *)&ioaddr->error_addr           ^= 0x03;
 162         *(unsigned long *)&ioaddr->feature_addr         ^= 0x03;
 163         *(unsigned long *)&ioaddr->nsect_addr           ^= 0x03;
 164         *(unsigned long *)&ioaddr->lbal_addr            ^= 0x03;
 165         *(unsigned long *)&ioaddr->lbam_addr            ^= 0x03;
 166         *(unsigned long *)&ioaddr->lbah_addr            ^= 0x03;
 167         *(unsigned long *)&ioaddr->device_addr          ^= 0x03;
 168         *(unsigned long *)&ioaddr->status_addr          ^= 0x03;
 169         *(unsigned long *)&ioaddr->command_addr         ^= 0x03;
 170 #endif
 171 }
 172
 173 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
 174 {
 175         int ret;
 176         unsigned int irq;
 177         struct resource *cs0, *cs1;
 178         struct ata_probe_ent ae;
 179
 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         pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
 189
 190         data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
 191         data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
 192
 193         irq = platform_get_irq(pdev, 0);
 194         if (irq)
 195                 set_irq_type(irq, IRQT_HIGH);
 196
 197         /* Setup expansion bus chip selects */
 198         *data->cs0_cfg = data->cs0_bits;
 199         *data->cs1_cfg = data->cs1_bits;
 200
 201         memset(&ae, 0, sizeof(struct ata_probe_ent));
 202         INIT_LIST_HEAD(&ae.node);
 203
 204         ae.dev          = &pdev->dev;
 205         ae.port_ops     = &ixp4xx_port_ops;
 206         ae.sht          = &ixp4xx_sht;
 207         ae.n_ports      = 1;
 208         ae.pio_mask     = 0x1f; /* PIO4 */
 209         ae.irq          = irq;
 210         ae.irq_flags    = 0;
 211         ae.port_flags   = ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY
 212                         | ATA_FLAG_NO_ATAPI | ATA_FLAG_SRST;
 213
 214         /* run in polling mode if no irq has been assigned */
 215         if (!irq)
 216                 ae.port_flags |= ATA_FLAG_PIO_POLLING;
 217
 218         ixp4xx_setup_port(&ae.port[0], data);
 219
 220         dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
 221
 222         ret = ata_device_add(&ae);
 223         if (ret == 0)
 224                 return -ENODEV;
 225
 226         return 0;
 227 }
 228
 229 static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
 230 {
 231         struct ata_host *host = platform_get_drvdata(dev);
 232
 233         ata_host_detach(host);
 234         platform_set_drvdata(dev, NULL);
 235
 236         return 0;
 237 }
 238
 239 static struct platform_driver ixp4xx_pata_platform_driver = {
 240         .driver  = {
 241                 .name   = DRV_NAME,
 242                 .owner  = THIS_MODULE,
 243         },
 244         .probe          = ixp4xx_pata_probe,
 245         .remove         = __devexit_p(ixp4xx_pata_remove),
 246 };
 247
 248 static int __init ixp4xx_pata_init(void)
 249 {
 250         return platform_driver_register(&ixp4xx_pata_platform_driver);
 251 }
 252
 253 static void __exit ixp4xx_pata_exit(void)
 254 {
 255         platform_driver_unregister(&ixp4xx_pata_platform_driver);
 256 }
 257
 258 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 259 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
 260 MODULE_LICENSE("GPL");
 261 MODULE_VERSION(DRV_VERSION);
 262
 263 module_init(ixp4xx_pata_init);
 264 module_exit(ixp4xx_pata_exit);