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_drive_t *drive, const u8 pio)
  60 {
  61         ide_hwif_t *hwif = drive->hwif;
  62         struct tx4938ide_platform_info *pdata = hwif->dev->platform_data;
  63         u8 safe = pio;
  64         ide_drive_t *pair;
  65
  66         pair = ide_get_pair_dev(drive);
  67         if (pair)
  68                 safe = min(safe, ide_get_best_pio_mode(pair, 255, 5));
  69         tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe);
  70 }
  71
  72 #ifdef __BIG_ENDIAN
  73
  74 /* custom iops (independent from SWAP_IO_SPACE) */
  75 static void tx4938ide_input_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
  76                                 void *buf, unsigned int len)
  77 {
  78         unsigned long port = drive->hwif->io_ports.data_addr;
  79         unsigned short *ptr = buf;
  80         unsigned int count = (len + 1) / 2;
  81
  82         while (count--)
  83                 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
  84         __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
  85 }
  86
  87 static void tx4938ide_output_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
  88                                 void *buf, unsigned int len)
  89 {
  90         unsigned long port = drive->hwif->io_ports.data_addr;
  91         unsigned short *ptr = buf;
  92         unsigned int count = (len + 1) / 2;
  93
  94         while (count--) {
  95                 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
  96                 ptr++;
  97         }
  98         __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
  99 }
 100
 101 static const struct ide_tp_ops tx4938ide_tp_ops = {
 102         .exec_command           = ide_exec_command,
 103         .read_status            = ide_read_status,
 104         .read_altstatus         = ide_read_altstatus,
 105         .write_devctl           = ide_write_devctl,
 106
 107         .dev_select             = ide_dev_select,
 108         .tf_load                = ide_tf_load,
 109         .tf_read                = ide_tf_read,
 110
 111         .input_data             = tx4938ide_input_data_swap,
 112         .output_data            = tx4938ide_output_data_swap,
 113 };
 114
 115 #endif  /* __BIG_ENDIAN */
 116
 117 static const struct ide_port_ops tx4938ide_port_ops = {
 118         .set_pio_mode           = tx4938ide_set_pio_mode,
 119 };
 120
 121 static const struct ide_port_info tx4938ide_port_info __initdata = {
 122         .port_ops               = &tx4938ide_port_ops,
 123 #ifdef __BIG_ENDIAN
 124         .tp_ops                 = &tx4938ide_tp_ops,
 125 #endif
 126         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
 127         .pio_mask               = ATA_PIO5,
 128         .chipset                = ide_generic,
 129 };
 130
 131 static int __init tx4938ide_probe(struct platform_device *pdev)
 132 {
 133         hw_regs_t hw;
 134         hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };
 135         struct ide_host *host;
 136         struct resource *res;
 137         struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;
 138         int irq, ret, i;
 139         unsigned long mapbase, mapctl;
 140         struct ide_port_info d = tx4938ide_port_info;
 141
 142         irq = platform_get_irq(pdev, 0);
 143         if (irq < 0)
 144                 return -ENODEV;
 145         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 146         if (!res)
 147                 return -ENODEV;
 148
 149         if (!devm_request_mem_region(&pdev->dev, res->start,
 150                                      res->end - res->start + 1, "tx4938ide"))
 151                 return -EBUSY;
 152         mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
 153                                               8 << pdata->ioport_shift);
 154         mapctl = (unsigned long)devm_ioremap(&pdev->dev,
 155                                              res->start + 0x10000 +
 156                                              (6 << pdata->ioport_shift),
 157                                              1 << pdata->ioport_shift);
 158         if (!mapbase || !mapctl)
 159                 return -EBUSY;
 160
 161         memset(&hw, 0, sizeof(hw));
 162         if (pdata->ioport_shift) {
 163                 unsigned long port = mapbase;
 164                 unsigned long ctl = mapctl;
 165
 166                 hw.io_ports_array[0] = port;
 167 #ifdef __BIG_ENDIAN
 168                 port++;
 169                 ctl++;
 170 #endif
 171                 for (i = 1; i <= 7; i++)
 172                         hw.io_ports_array[i] =
 173                                 port + (i << pdata->ioport_shift);
 174                 hw.io_ports.ctl_addr = ctl;
 175         } else
 176                 ide_std_init_ports(&hw, mapbase, mapctl);
 177         hw.irq = irq;
 178         hw.dev = &pdev->dev;
 179
 180         pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n",
 181                 mapbase, mapctl, hw.irq);
 182         if (pdata->gbus_clock)
 183                 tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0);
 184         else
 185                 d.port_ops = NULL;
 186         ret = ide_host_add(&d, hws, &host);
 187         if (!ret)
 188                 platform_set_drvdata(pdev, host);
 189         return ret;
 190 }
 191
 192 static int __exit tx4938ide_remove(struct platform_device *pdev)
 193 {
 194         struct ide_host *host = platform_get_drvdata(pdev);
 195
 196         ide_host_remove(host);
 197         return 0;
 198 }
 199
 200 static struct platform_driver tx4938ide_driver = {
 201         .driver         = {
 202                 .name   = "tx4938ide",
 203                 .owner  = THIS_MODULE,
 204         },
 205         .remove = __exit_p(tx4938ide_remove),
 206 };
 207
 208 static int __init tx4938ide_init(void)
 209 {
 210         return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
 211 }
 212
 213 static void __exit tx4938ide_exit(void)
 214 {
 215         platform_driver_unregister(&tx4938ide_driver);
 216 }
 217
 218 module_init(tx4938ide_init);
 219 module_exit(tx4938ide_exit);
 220
 221 MODULE_DESCRIPTION("TX4938 internal IDE driver");
 222 MODULE_LICENSE("GPL");
 223 MODULE_ALIAS("platform:tx4938ide");