drivers/ide/falconide.c

   1 /*
   2  *  Atari Falcon IDE Driver
   3  *
   4  *     Created 12 Jul 1997 by Geert Uytterhoeven
   5  *
   6  *  This file is subject to the terms and conditions of the GNU General Public
   7  *  License.  See the file COPYING in the main directory of this archive for
   8  *  more details.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/mm.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/ide.h>
  17 #include <linux/init.h>
  18 #include <linux/platform_device.h>
  19
  20 #include <asm/setup.h>
  21 #include <asm/atarihw.h>
  22 #include <asm/atariints.h>
  23 #include <asm/atari_stdma.h>
  24 #include <asm/ide.h>
  25
  26 #define DRV_NAME "falconide"
  27
  28     /*
  29      *  Offsets from base address
  30      */
  31
  32 #define ATA_HD_CONTROL  0x39
  33
  34     /*
  35      *  falconide_intr_lock is used to obtain access to the IDE interrupt,
  36      *  which is shared between several drivers.
  37      */
  38
  39 static int falconide_intr_lock;
  40
  41 static void falconide_release_lock(void)
  42 {
  43         if (falconide_intr_lock == 0) {
  44                 printk(KERN_ERR "%s: bug\n", __func__);
  45                 return;
  46         }
  47         falconide_intr_lock = 0;
  48         stdma_release();
  49 }
  50
  51 static void falconide_get_lock(irq_handler_t handler, void *data)
  52 {
  53         if (falconide_intr_lock == 0) {
  54                 if (in_interrupt() > 0)
  55                         panic("Falcon IDE hasn't ST-DMA lock in interrupt");
  56                 stdma_lock(handler, data);
  57                 falconide_intr_lock = 1;
  58         }
  59 }
  60
  61 static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
  62                                  void *buf, unsigned int len)
  63 {
  64         unsigned long data_addr = drive->hwif->io_ports.data_addr;
  65
  66         if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
  67                 __ide_mm_insw(data_addr, buf, (len + 1) / 2);
  68                 return;
  69         }
  70
  71         raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
  72 }
  73
  74 static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
  75                                   void *buf, unsigned int len)
  76 {
  77         unsigned long data_addr = drive->hwif->io_ports.data_addr;
  78
  79         if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
  80                 __ide_mm_outsw(data_addr, buf, (len + 1) / 2);
  81                 return;
  82         }
  83
  84         raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
  85 }
  86
  87 /* Atari has a byte-swapped IDE interface */
  88 static const struct ide_tp_ops falconide_tp_ops = {
  89         .exec_command           = ide_exec_command,
  90         .read_status            = ide_read_status,
  91         .read_altstatus         = ide_read_altstatus,
  92         .write_devctl           = ide_write_devctl,
  93
  94         .dev_select             = ide_dev_select,
  95         .tf_load                = ide_tf_load,
  96         .tf_read                = ide_tf_read,
  97
  98         .input_data             = falconide_input_data,
  99         .output_data            = falconide_output_data,
 100 };
 101
 102 static const struct ide_port_info falconide_port_info = {
 103         .get_lock               = falconide_get_lock,
 104         .release_lock           = falconide_release_lock,
 105         .tp_ops                 = &falconide_tp_ops,
 106         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
 107                                   IDE_HFLAG_NO_DMA,
 108         .irq_flags              = IRQF_SHARED,
 109         .chipset                = ide_generic,
 110 };
 111
 112 static void __init falconide_setup_ports(struct ide_hw *hw, unsigned long base)
 113 {
 114         int i;
 115
 116         memset(hw, 0, sizeof(*hw));
 117
 118         hw->io_ports.data_addr = base;
 119
 120         for (i = 1; i < 8; i++)
 121                 hw->io_ports_array[i] = base + 1 + i * 4;
 122
 123         hw->io_ports.ctl_addr = base + ATA_HD_CONTROL;
 124
 125         hw->irq = IRQ_MFP_IDE;
 126 }
 127
 128     /*
 129      *  Probe for a Falcon IDE interface
 130      */
 131
 132 static int __init falconide_init(struct platform_device *pdev)
 133 {
 134         struct resource *res;
 135         struct ide_host *host;
 136         struct ide_hw hw, *hws[] = { &hw };
 137         unsigned long base;
 138         int rc;
 139
 140         dev_info(&pdev->dev, "Atari Falcon IDE controller\n");
 141
 142         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 143         if (!res)
 144                 return -ENODEV;
 145
 146         if (!devm_request_mem_region(&pdev->dev, res->start,
 147                                      resource_size(res), DRV_NAME)) {
 148                 dev_err(&pdev->dev, "resources busy\n");
 149                 return -EBUSY;
 150         }
 151
 152         base = (unsigned long)res->start;
 153
 154         falconide_setup_ports(&hw, base);
 155
 156         host = ide_host_alloc(&falconide_port_info, hws, 1);
 157         if (host == NULL) {
 158                 rc = -ENOMEM;
 159                 goto err;
 160         }
 161
 162         falconide_get_lock(NULL, NULL);
 163         rc = ide_host_register(host, &falconide_port_info, hws);
 164         falconide_release_lock();
 165
 166         if (rc)
 167                 goto err_free;
 168
 169         return 0;
 170 err_free:
 171         ide_host_free(host);
 172 err:
 173         release_mem_region(res->start, resource_size(res));
 174         return rc;
 175 }
 176
 177 static int falconide_remove(struct platform_device *pdev)
 178 {
 179         struct ide_host *host = dev_get_drvdata(&pdev->dev);
 180
 181         ide_host_remove(host);
 182
 183         return 0;
 184 }
 185
 186 static struct platform_driver ide_falcon_driver = {
 187         .remove = falconide_remove,
 188         .driver   = {
 189                 .name   = "atari-falcon-ide",
 190         },
 191 };
 192
 193 module_platform_driver_probe(ide_falcon_driver, falconide_init);
 194
 195 MODULE_AUTHOR("Geert Uytterhoeven");
 196 MODULE_DESCRIPTION("low-level driver for Atari Falcon IDE");
 197 MODULE_LICENSE("GPL");
 198 MODULE_ALIAS("platform:atari-falcon-ide");