drivers/ide/tx4938ide.c

   1 /*
   2  * TX4938 internal IDE driver
   3  * Based on tx4939ide.c.
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  *
   9  * (C) Copyright TOSHIBA CORPORATION 2005-2007
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/ide.h>
  15 #include <linux/init.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/io.h>
  18
  19 #include <asm/ide.h>
  20 #include <asm/txx9/tx4938.h>
  21
  22 static void tx4938ide_tune_ebusc(unsigned int ebus_ch,
  23                                  unsigned int gbus_clock,
  24                                  u8 pio)
  25 {
  26         struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
  27         u64 cr = __raw_readq(&tx4938_ebuscptr->cr[ebus_ch]);
  28         unsigned int sp = (cr >> 4) & 3;
  29         unsigned int clock = gbus_clock / (4 - sp);
  30         unsigned int cycle = 1000000000 / clock;
  31         unsigned int shwt;
  32         int wt;
  33
  34         /* Minimum DIOx- active time */
  35         wt = DIV_ROUND_UP(t->act8b, cycle) - 2;
  36         /* IORDY setup time: 35ns */
  37         wt = max_t(int, wt, DIV_ROUND_UP(35, cycle));
  38         /* actual wait-cycle is max(wt & ~1, 1) */
  39         if (wt > 2 && (wt & 1))
  40                 wt++;
  41         wt &= ~1;
  42         /* Address-valid to DIOR/DIOW setup */
  43         shwt = DIV_ROUND_UP(t->setup, cycle);
  44
  45         /* -DIOx recovery time (SHWT * 4) and cycle time requirement */
  46         while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle)
  47                 shwt++;
  48         if (shwt > 7) {
  49                 pr_warning("tx4938ide: SHWT violation (%d)\n", shwt);
  50                 shwt = 7;
  51         }
  52         pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n",
  53                  ebus_ch, cycle, wt, shwt);
  54
  55         __raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt,
  56                      &tx4938_ebuscptr->cr[ebus_ch]);
  57 }
  58
  59 static void tx4938ide_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  60 {
  61         struct tx4938ide_platform_info *pdata = hwif->dev->platform_data;
  62         u8 safe = drive->pio_mode - XFER_PIO_0;
  63         ide_drive_t *pair;
  64
  65         pair = ide_get_pair_dev(drive);
  66         if (pair)
  67                 safe = min(safe, pair->pio_mode - XFER_PIO_0);
  68         tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe);
  69 }
  70
  71 #ifdef __BIG_ENDIAN
  72
  73 /* custom iops (independent from SWAP_IO_SPACE) */
  74 static void tx4938ide_input_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
  75                                 void *buf, unsigned int len)
  76 {
  77         unsigned long port = drive->hwif->io_ports.data_addr;
  78         unsigned short *ptr = buf;
  79         unsigned int count = (len + 1) / 2;
  80
  81         while (count--)
  82                 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
  83         __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
  84 }
  85
  86 static void tx4938ide_output_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
  87                                 void *buf, unsigned int len)
  88 {
  89         unsigned long port = drive->hwif->io_ports.data_addr;
  90         unsigned short *ptr = buf;
  91         unsigned int count = (len + 1) / 2;
  92
  93         while (count--) {
  94                 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
  95                 ptr++;
  96         }
  97         __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
  98 }
  99
 100 static const struct ide_tp_ops tx4938ide_tp_ops = {
 101         .exec_command           = ide_exec_command,
 102         .read_status            = ide_read_status,
 103         .read_altstatus         = ide_read_altstatus,
 104         .write_devctl           = ide_write_devctl,
 105
 106         .dev_select             = ide_dev_select,
 107         .tf_load                = ide_tf_load,
 108         .tf_read                = ide_tf_read,
 109
 110         .input_data             = tx4938ide_input_data_swap,
 111         .output_data            = tx4938ide_output_data_swap,
 112 };
 113
 114 #endif  /* __BIG_ENDIAN */
 115
 116 static const struct ide_port_ops tx4938ide_port_ops = {
 117         .set_pio_mode           = tx4938ide_set_pio_mode,
 118 };
 119
 120 static const struct ide_port_info tx4938ide_port_info __initdata = {
 121         .port_ops               = &tx4938ide_port_ops,
 122 #ifdef __BIG_ENDIAN
 123         .tp_ops                 = &tx4938ide_tp_ops,
 124 #endif
 125         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
 126         .pio_mask               = ATA_PIO5,
 127         .chipset                = ide_generic,
 128 };
 129
 130 static int __init tx4938ide_probe(struct platform_device *pdev)
 131 {
 132         struct ide_hw hw, *hws[] = { &hw };
 133         struct ide_host *host;
 134         struct resource *res;
 135         struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;
 136         int irq, ret, i;
 137         unsigned long mapbase, mapctl;
 138         struct ide_port_info d = tx4938ide_port_info;
 139
 140         irq = platform_get_irq(pdev, 0);
 141         if (irq < 0)
 142                 return -ENODEV;
 143         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 144         if (!res)
 145                 return -ENODEV;
 146
 147         if (!devm_request_mem_region(&pdev->dev, res->start,
 148                                      resource_size(res), "tx4938ide"))
 149                 return -EBUSY;
 150         mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
 151                                               8 << pdata->ioport_shift);
 152         mapctl = (unsigned long)devm_ioremap(&pdev->dev,
 153                                              res->start + 0x10000 +
 154                                              (6 << pdata->ioport_shift),
 155                                              1 << pdata->ioport_shift);
 156         if (!mapbase || !mapctl)
 157                 return -EBUSY;
 158
 159         memset(&hw, 0, sizeof(hw));
 160         if (pdata->ioport_shift) {
 161                 unsigned long port = mapbase;
 162                 unsigned long ctl = mapctl;
 163
 164                 hw.io_ports_array[0] = port;
 165 #ifdef __BIG_ENDIAN
 166                 port++;
 167                 ctl++;
 168 #endif
 169                 for (i = 1; i <= 7; i++)
 170                         hw.io_ports_array[i] =
 171                                 port + (i << pdata->ioport_shift);
 172                 hw.io_ports.ctl_addr = ctl;
 173         } else
 174                 ide_std_init_ports(&hw, mapbase, mapctl);
 175         hw.irq = irq;
 176         hw.dev = &pdev->dev;
 177
 178         pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n",
 179                 mapbase, mapctl, hw.irq);
 180         if (pdata->gbus_clock)
 181                 tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0);
 182         else
 183                 d.port_ops = NULL;
 184         ret = ide_host_add(&d, hws, 1, &host);
 185         if (!ret)
 186                 platform_set_drvdata(pdev, host);
 187         return ret;
 188 }
 189
 190 static int __exit tx4938ide_remove(struct platform_device *pdev)
 191 {
 192         struct ide_host *host = platform_get_drvdata(pdev);
 193
 194         ide_host_remove(host);
 195         return 0;
 196 }
 197
 198 static struct platform_driver tx4938ide_driver = {
 199         .driver         = {
 200                 .name   = "tx4938ide",
 201                 .owner  = THIS_MODULE,
 202         },
 203         .remove = __exit_p(tx4938ide_remove),
 204 };
 205
 206 static int __init tx4938ide_init(void)
 207 {
 208         return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
 209 }
 210
 211 static void __exit tx4938ide_exit(void)
 212 {
 213         platform_driver_unregister(&tx4938ide_driver);
 214 }
 215
 216 module_init(tx4938ide_init);
 217 module_exit(tx4938ide_exit);
 218
 219 MODULE_DESCRIPTION("TX4938 internal IDE driver");
 220 MODULE_LICENSE("GPL");
 221 MODULE_ALIAS("platform:tx4938ide");