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_port *ap, struct ata_device **error)
  30 {
  31         int i;
  32
  33         for (i = 0; i < ATA_MAX_DEVICES; i++) {
  34                 struct ata_device *dev = &ap->device[i];
  35                 if (ata_dev_enabled(dev)) {
  36                         ata_dev_printk(dev, KERN_INFO, "configured for PIO0\n");
  37                         dev->pio_mode = XFER_PIO_0;
  38                         dev->xfer_mode = XFER_PIO_0;
  39                         dev->xfer_shift = ATA_SHIFT_PIO;
  40                         dev->flags |= ATA_DFLAG_PIO;
  41                 }
  42         }
  43         return 0;
  44 }
  45
  46 static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
  47                                 unsigned int buflen, int write_data)
  48 {
  49         unsigned int i;
  50         unsigned int words = buflen >> 1;
  51         u16 *buf16 = (u16 *) buf;
  52         struct ata_port *ap = adev->ap;
  53         void __iomem *mmio = ap->ioaddr.data_addr;
  54         struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
  55
  56         /* set the expansion bus in 16bit mode and restore
  57          * 8 bit mode after the transaction.
  58          */
  59         *data->cs0_cfg &= ~(0x01);
  60         udelay(100);
  61
  62         /* Transfer multiple of 2 bytes */
  63         if (write_data) {
  64                 for (i = 0; i < words; i++)
  65                         writew(buf16[i], mmio);
  66         } else {
  67                 for (i = 0; i < words; i++)
  68                         buf16[i] = readw(mmio);
  69         }
  70
  71         /* Transfer trailing 1 byte, if any. */
  72         if (unlikely(buflen & 0x01)) {
  73                 u16 align_buf[1] = { 0 };
  74                 unsigned char *trailing_buf = buf + buflen - 1;
  75
  76                 if (write_data) {
  77                         memcpy(align_buf, trailing_buf, 1);
  78                         writew(align_buf[0], mmio);
  79                 } else {
  80                         align_buf[0] = readw(mmio);
  81                         memcpy(trailing_buf, align_buf, 1);
  82                 }
  83         }
  84
  85         udelay(100);
  86         *data->cs0_cfg |= 0x01;
  87 }
  88
  89 static struct scsi_host_template ixp4xx_sht = {
  90         .module                 = THIS_MODULE,
  91         .name                   = DRV_NAME,
  92         .ioctl                  = ata_scsi_ioctl,
  93         .queuecommand           = ata_scsi_queuecmd,
  94         .can_queue              = ATA_DEF_QUEUE,
  95         .this_id                = ATA_SHT_THIS_ID,
  96         .sg_tablesize           = LIBATA_MAX_PRD,
  97         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
  98         .emulated               = ATA_SHT_EMULATED,
  99         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 100         .proc_name              = DRV_NAME,
 101         .dma_boundary           = ATA_DMA_BOUNDARY,
 102         .slave_configure        = ata_scsi_slave_config,
 103         .slave_destroy          = ata_scsi_slave_destroy,
 104         .bios_param             = ata_std_bios_param,
 105 };
 106
 107 static struct ata_port_operations ixp4xx_port_ops = {
 108         .set_mode               = ixp4xx_set_mode,
 109         .mode_filter            = ata_pci_default_filter,
 110
 111         .port_disable           = ata_port_disable,
 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         .irq_ack                = ata_dummy_irq_ack,
 132
 133         .port_start             = ata_port_start,
 134 };
 135
 136 static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
 137                                 struct ixp4xx_pata_data *data)
 138 {
 139         ioaddr->cmd_addr        = data->cs0;
 140         ioaddr->altstatus_addr  = data->cs1 + 0x06;
 141         ioaddr->ctl_addr        = data->cs1 + 0x06;
 142
 143         ata_std_ports(ioaddr);
 144
 145 #ifndef __ARMEB__
 146
 147         /* adjust the addresses to handle the address swizzling of the
 148          * ixp4xx in little endian mode.
 149          */
 150
 151         *(unsigned long *)&ioaddr->data_addr            ^= 0x02;
 152         *(unsigned long *)&ioaddr->cmd_addr             ^= 0x03;
 153         *(unsigned long *)&ioaddr->altstatus_addr       ^= 0x03;
 154         *(unsigned long *)&ioaddr->ctl_addr             ^= 0x03;
 155         *(unsigned long *)&ioaddr->error_addr           ^= 0x03;
 156         *(unsigned long *)&ioaddr->feature_addr         ^= 0x03;
 157         *(unsigned long *)&ioaddr->nsect_addr           ^= 0x03;
 158         *(unsigned long *)&ioaddr->lbal_addr            ^= 0x03;
 159         *(unsigned long *)&ioaddr->lbam_addr            ^= 0x03;
 160         *(unsigned long *)&ioaddr->lbah_addr            ^= 0x03;
 161         *(unsigned long *)&ioaddr->device_addr          ^= 0x03;
 162         *(unsigned long *)&ioaddr->status_addr          ^= 0x03;
 163         *(unsigned long *)&ioaddr->command_addr         ^= 0x03;
 164 #endif
 165 }
 166
 167 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
 168 {
 169         unsigned int irq;
 170         struct resource *cs0, *cs1;
 171         struct ata_host *host;
 172         struct ata_port *ap;
 173         struct ixp4xx_pata_data *data = pdev->dev.platform_data;
 174
 175         cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 176         cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 177
 178         if (!cs0 || !cs1)
 179                 return -EINVAL;
 180
 181         /* allocate host */
 182         host = ata_host_alloc(&pdev->dev, 1);
 183         if (!host)
 184                 return -ENOMEM;
 185
 186         /* acquire resources and fill host */
 187         pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
 188
 189         data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
 190         data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
 191
 192         irq = platform_get_irq(pdev, 0);
 193         if (irq)
 194                 set_irq_type(irq, IRQT_RISING);
 195
 196         /* Setup expansion bus chip selects */
 197         *data->cs0_cfg = data->cs0_bits;
 198         *data->cs1_cfg = data->cs1_bits;
 199
 200         ap = host->ports[0];
 201
 202         ap->ops = &ixp4xx_port_ops;
 203         ap->pio_mask = 0x1f; /* PIO4 */
 204         ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
 205
 206         ixp4xx_setup_port(&ap->ioaddr, data);
 207
 208         dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
 209
 210         /* activate host */
 211         return ata_host_activate(host, irq, ata_interrupt, 0, &ixp4xx_sht);
 212 }
 213
 214 static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
 215 {
 216         struct ata_host *host = platform_get_drvdata(dev);
 217
 218         ata_host_detach(host);
 219
 220         return 0;
 221 }
 222
 223 static struct platform_driver ixp4xx_pata_platform_driver = {
 224         .driver  = {
 225                 .name   = DRV_NAME,
 226                 .owner  = THIS_MODULE,
 227         },
 228         .probe          = ixp4xx_pata_probe,
 229         .remove         = __devexit_p(ixp4xx_pata_remove),
 230 };
 231
 232 static int __init ixp4xx_pata_init(void)
 233 {
 234         return platform_driver_register(&ixp4xx_pata_platform_driver);
 235 }
 236
 237 static void __exit ixp4xx_pata_exit(void)
 238 {
 239         platform_driver_unregister(&ixp4xx_pata_platform_driver);
 240 }
 241
 242 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 243 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
 244 MODULE_LICENSE("GPL");
 245 MODULE_VERSION(DRV_VERSION);
 246
 247 module_init(ixp4xx_pata_init);
 248 module_exit(ixp4xx_pata_exit);