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     "0.1.2"
  27
  28 static int ixp4xx_set_mode(struct ata_port *ap, struct ata_device **error)
  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_ready(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_phy_reset(struct ata_port *ap)
  46 {
  47         ap->cbl = ATA_CBL_PATA40;
  48         ata_port_probe(ap);
  49         ata_bus_reset(ap);
  50 }
  51
  52 static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
  53                                 unsigned int buflen, int write_data)
  54 {
  55         unsigned int i;
  56         unsigned int words = buflen >> 1;
  57         u16 *buf16 = (u16 *) buf;
  58         struct ata_port *ap = adev->ap;
  59         void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
  60         struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
  61
  62         /* set the expansion bus in 16bit mode and restore
  63          * 8 bit mode after the transaction.
  64          */
  65         *data->cs0_cfg &= ~(0x01);
  66         udelay(100);
  67
  68         /* Transfer multiple of 2 bytes */
  69         if (write_data) {
  70                 for (i = 0; i < words; i++)
  71                         writew(buf16[i], mmio);
  72         } else {
  73                 for (i = 0; i < words; i++)
  74                         buf16[i] = readw(mmio);
  75         }
  76
  77         /* Transfer trailing 1 byte, if any. */
  78         if (unlikely(buflen & 0x01)) {
  79                 u16 align_buf[1] = { 0 };
  80                 unsigned char *trailing_buf = buf + buflen - 1;
  81
  82                 if (write_data) {
  83                         memcpy(align_buf, trailing_buf, 1);
  84                         writew(align_buf[0], mmio);
  85                 } else {
  86                         align_buf[0] = readw(mmio);
  87                         memcpy(trailing_buf, align_buf, 1);
  88                 }
  89         }
  90
  91         udelay(100);
  92         *data->cs0_cfg |= 0x01;
  93 }
  94
  95 static void ixp4xx_irq_clear(struct ata_port *ap)
  96 {
  97 }
  98
  99 static struct scsi_host_template ixp4xx_sht = {
 100         .module                 = THIS_MODULE,
 101         .name                   = DRV_NAME,
 102         .ioctl                  = ata_scsi_ioctl,
 103         .queuecommand           = ata_scsi_queuecmd,
 104         .can_queue              = ATA_DEF_QUEUE,
 105         .this_id                = ATA_SHT_THIS_ID,
 106         .sg_tablesize           = LIBATA_MAX_PRD,
 107         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 108         .emulated               = ATA_SHT_EMULATED,
 109         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 110         .proc_name              = DRV_NAME,
 111         .dma_boundary           = ATA_DMA_BOUNDARY,
 112         .slave_configure        = ata_scsi_slave_config,
 113         .slave_destroy          = ata_scsi_slave_destroy,
 114         .bios_param             = ata_std_bios_param,
 115 };
 116
 117 static struct ata_port_operations ixp4xx_port_ops = {
 118         .set_mode       = ixp4xx_set_mode,
 119         .mode_filter    = ata_pci_default_filter,
 120
 121         .port_disable   = ata_port_disable,
 122         .tf_load        = ata_tf_load,
 123         .tf_read        = ata_tf_read,
 124         .check_status   = ata_check_status,
 125         .exec_command   = ata_exec_command,
 126         .dev_select     = ata_std_dev_select,
 127
 128         .qc_prep        = ata_qc_prep,
 129         .qc_issue       = ata_qc_issue_prot,
 130         .eng_timeout    = ata_eng_timeout,
 131         .data_xfer      = ixp4xx_mmio_data_xfer,
 132
 133         .irq_handler    = ata_interrupt,
 134         .irq_clear      = ixp4xx_irq_clear,
 135         .irq_on         = ata_irq_on,
 136         .irq_ack        = ata_irq_ack,
 137
 138         .port_start     = ata_port_start,
 139
 140         .phy_reset      = ixp4xx_phy_reset,
 141 };
 142
 143 static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
 144                                 struct ixp4xx_pata_data *data)
 145 {
 146         ioaddr->cmd_addr        = data->cs0;
 147         ioaddr->altstatus_addr  = data->cs1 + 0x06;
 148         ioaddr->ctl_addr        = data->cs1 + 0x06;
 149
 150         ata_std_ports(ioaddr);
 151
 152 #ifndef __ARMEB__
 153
 154         /* adjust the addresses to handle the address swizzling of the
 155          * ixp4xx in little endian mode.
 156          */
 157
 158         *(unsigned long *)&ioaddr->data_addr            ^= 0x02;
 159         *(unsigned long *)&ioaddr->cmd_addr             ^= 0x03;
 160         *(unsigned long *)&ioaddr->altstatus_addr       ^= 0x03;
 161         *(unsigned long *)&ioaddr->ctl_addr             ^= 0x03;
 162         *(unsigned long *)&ioaddr->error_addr           ^= 0x03;
 163         *(unsigned long *)&ioaddr->feature_addr         ^= 0x03;
 164         *(unsigned long *)&ioaddr->nsect_addr           ^= 0x03;
 165         *(unsigned long *)&ioaddr->lbal_addr            ^= 0x03;
 166         *(unsigned long *)&ioaddr->lbam_addr            ^= 0x03;
 167         *(unsigned long *)&ioaddr->lbah_addr            ^= 0x03;
 168         *(unsigned long *)&ioaddr->device_addr          ^= 0x03;
 169         *(unsigned long *)&ioaddr->status_addr          ^= 0x03;
 170         *(unsigned long *)&ioaddr->command_addr         ^= 0x03;
 171 #endif
 172 }
 173
 174 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
 175 {
 176         int ret;
 177         unsigned int irq;
 178         struct resource *cs0, *cs1;
 179         struct ata_probe_ent ae;
 180
 181         struct ixp4xx_pata_data *data = pdev->dev.platform_data;
 182
 183         cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 184         cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 185
 186         if (!cs0 || !cs1)
 187                 return -EINVAL;
 188
 189         pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
 190
 191         data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
 192         data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
 193
 194         irq = platform_get_irq(pdev, 0);
 195         if (irq)
 196                 set_irq_type(irq, IRQT_HIGH);
 197
 198         /* Setup expansion bus chip selects */
 199         *data->cs0_cfg = data->cs0_bits;
 200         *data->cs1_cfg = data->cs1_bits;
 201
 202         memset(&ae, 0, sizeof(struct ata_probe_ent));
 203         INIT_LIST_HEAD(&ae.node);
 204
 205         ae.dev          = &pdev->dev;
 206         ae.port_ops     = &ixp4xx_port_ops;
 207         ae.sht          = &ixp4xx_sht;
 208         ae.n_ports      = 1;
 209         ae.pio_mask     = 0x1f; /* PIO4 */
 210         ae.irq          = irq;
 211         ae.irq_flags    = 0;
 212         ae.port_flags   = ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY
 213                         | ATA_FLAG_NO_ATAPI | ATA_FLAG_SRST;
 214
 215         /* run in polling mode if no irq has been assigned */
 216         if (!irq)
 217                 ae.port_flags |= ATA_FLAG_PIO_POLLING;
 218
 219         ixp4xx_setup_port(&ae.port[0], data);
 220
 221         dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
 222
 223         ret = ata_device_add(&ae);
 224         if (ret == 0)
 225                 return -ENODEV;
 226
 227         return 0;
 228 }
 229
 230 static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
 231 {
 232         struct ata_host *host = platform_get_drvdata(dev);
 233
 234         ata_host_detach(host);
 235         platform_set_drvdata(dev, NULL);
 236
 237         return 0;
 238 }
 239
 240 static struct platform_driver ixp4xx_pata_platform_driver = {
 241         .driver  = {
 242                 .name   = DRV_NAME,
 243                 .owner  = THIS_MODULE,
 244         },
 245         .probe          = ixp4xx_pata_probe,
 246         .remove         = __devexit_p(ixp4xx_pata_remove),
 247 };
 248
 249 static int __init ixp4xx_pata_init(void)
 250 {
 251         return platform_driver_register(&ixp4xx_pata_platform_driver);
 252 }
 253
 254 static void __exit ixp4xx_pata_exit(void)
 255 {
 256         platform_driver_unregister(&ixp4xx_pata_platform_driver);
 257 }
 258
 259 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 260 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
 261 MODULE_LICENSE("GPL");
 262 MODULE_VERSION(DRV_VERSION);
 263
 264 module_init(ixp4xx_pata_init);
 265 module_exit(ixp4xx_pata_exit);