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 u8 tx4938ide_inb(unsigned long port)
  76 {
  77         return __raw_readb((void __iomem *)port);
  78 }
  79
  80 static void tx4938ide_outb(u8 value, unsigned long port)
  81 {
  82         __raw_writeb(value, (void __iomem *)port);
  83 }
  84
  85 static void tx4938ide_tf_load(ide_drive_t *drive, struct ide_cmd *cmd)
  86 {
  87         ide_hwif_t *hwif = drive->hwif;
  88         struct ide_io_ports *io_ports = &hwif->io_ports;
  89         struct ide_taskfile *tf = &cmd->tf;
  90         u8 HIHI = cmd->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF;
  91
  92         if (cmd->ftf_flags & IDE_FTFLAG_FLAGGED)
  93                 HIHI = 0xFF;
  94
  95         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
  96                 tx4938ide_outb(tf->hob_feature, io_ports->feature_addr);
  97         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
  98                 tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr);
  99         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
 100                 tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr);
 101         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
 102                 tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr);
 103         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
 104                 tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr);
 105
 106         if (cmd->tf_flags & IDE_TFLAG_OUT_FEATURE)
 107                 tx4938ide_outb(tf->feature, io_ports->feature_addr);
 108         if (cmd->tf_flags & IDE_TFLAG_OUT_NSECT)
 109                 tx4938ide_outb(tf->nsect, io_ports->nsect_addr);
 110         if (cmd->tf_flags & IDE_TFLAG_OUT_LBAL)
 111                 tx4938ide_outb(tf->lbal, io_ports->lbal_addr);
 112         if (cmd->tf_flags & IDE_TFLAG_OUT_LBAM)
 113                 tx4938ide_outb(tf->lbam, io_ports->lbam_addr);
 114         if (cmd->tf_flags & IDE_TFLAG_OUT_LBAH)
 115                 tx4938ide_outb(tf->lbah, io_ports->lbah_addr);
 116
 117         if (cmd->tf_flags & IDE_TFLAG_OUT_DEVICE)
 118                 tx4938ide_outb((tf->device & HIHI) | drive->select,
 119                                io_ports->device_addr);
 120 }
 121
 122 static void tx4938ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 123 {
 124         ide_hwif_t *hwif = drive->hwif;
 125         struct ide_io_ports *io_ports = &hwif->io_ports;
 126         struct ide_taskfile *tf = &cmd->tf;
 127
 128         /* be sure we're looking at the low order bits */
 129         tx4938ide_outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 130
 131         if (cmd->tf_flags & IDE_TFLAG_IN_ERROR)
 132                 tf->error  = tx4938ide_inb(io_ports->feature_addr);
 133         if (cmd->tf_flags & IDE_TFLAG_IN_NSECT)
 134                 tf->nsect  = tx4938ide_inb(io_ports->nsect_addr);
 135         if (cmd->tf_flags & IDE_TFLAG_IN_LBAL)
 136                 tf->lbal   = tx4938ide_inb(io_ports->lbal_addr);
 137         if (cmd->tf_flags & IDE_TFLAG_IN_LBAM)
 138                 tf->lbam   = tx4938ide_inb(io_ports->lbam_addr);
 139         if (cmd->tf_flags & IDE_TFLAG_IN_LBAH)
 140                 tf->lbah   = tx4938ide_inb(io_ports->lbah_addr);
 141         if (cmd->tf_flags & IDE_TFLAG_IN_DEVICE)
 142                 tf->device = tx4938ide_inb(io_ports->device_addr);
 143
 144         if (cmd->tf_flags & IDE_TFLAG_LBA48) {
 145                 tx4938ide_outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 146
 147                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_ERROR)
 148                         tf->hob_error = tx4938ide_inb(io_ports->feature_addr);
 149                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
 150                         tf->hob_nsect = tx4938ide_inb(io_ports->nsect_addr);
 151                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 152                         tf->hob_lbal  = tx4938ide_inb(io_ports->lbal_addr);
 153                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 154                         tf->hob_lbam  = tx4938ide_inb(io_ports->lbam_addr);
 155                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 156                         tf->hob_lbah  = tx4938ide_inb(io_ports->lbah_addr);
 157         }
 158 }
 159
 160 static void tx4938ide_input_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
 161                                 void *buf, unsigned int len)
 162 {
 163         unsigned long port = drive->hwif->io_ports.data_addr;
 164         unsigned short *ptr = buf;
 165         unsigned int count = (len + 1) / 2;
 166
 167         while (count--)
 168                 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
 169         __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
 170 }
 171
 172 static void tx4938ide_output_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
 173                                 void *buf, unsigned int len)
 174 {
 175         unsigned long port = drive->hwif->io_ports.data_addr;
 176         unsigned short *ptr = buf;
 177         unsigned int count = (len + 1) / 2;
 178
 179         while (count--) {
 180                 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
 181                 ptr++;
 182         }
 183         __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
 184 }
 185
 186 static const struct ide_tp_ops tx4938ide_tp_ops = {
 187         .exec_command           = ide_exec_command,
 188         .read_status            = ide_read_status,
 189         .read_altstatus         = ide_read_altstatus,
 190         .write_devctl           = ide_write_devctl,
 191
 192         .dev_select             = ide_dev_select,
 193         .tf_load                = tx4938ide_tf_load,
 194         .tf_read                = tx4938ide_tf_read,
 195
 196         .input_data             = tx4938ide_input_data_swap,
 197         .output_data            = tx4938ide_output_data_swap,
 198 };
 199
 200 #endif  /* __BIG_ENDIAN */
 201
 202 static const struct ide_port_ops tx4938ide_port_ops = {
 203         .set_pio_mode           = tx4938ide_set_pio_mode,
 204 };
 205
 206 static const struct ide_port_info tx4938ide_port_info __initdata = {
 207         .port_ops               = &tx4938ide_port_ops,
 208 #ifdef __BIG_ENDIAN
 209         .tp_ops                 = &tx4938ide_tp_ops,
 210 #endif
 211         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
 212         .pio_mask               = ATA_PIO5,
 213         .chipset                = ide_generic,
 214 };
 215
 216 static int __init tx4938ide_probe(struct platform_device *pdev)
 217 {
 218         hw_regs_t hw;
 219         hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };
 220         struct ide_host *host;
 221         struct resource *res;
 222         struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;
 223         int irq, ret, i;
 224         unsigned long mapbase, mapctl;
 225         struct ide_port_info d = tx4938ide_port_info;
 226
 227         irq = platform_get_irq(pdev, 0);
 228         if (irq < 0)
 229                 return -ENODEV;
 230         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 231         if (!res)
 232                 return -ENODEV;
 233
 234         if (!devm_request_mem_region(&pdev->dev, res->start,
 235                                      res->end - res->start + 1, "tx4938ide"))
 236                 return -EBUSY;
 237         mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
 238                                               8 << pdata->ioport_shift);
 239         mapctl = (unsigned long)devm_ioremap(&pdev->dev,
 240                                              res->start + 0x10000 +
 241                                              (6 << pdata->ioport_shift),
 242                                              1 << pdata->ioport_shift);
 243         if (!mapbase || !mapctl)
 244                 return -EBUSY;
 245
 246         memset(&hw, 0, sizeof(hw));
 247         if (pdata->ioport_shift) {
 248                 unsigned long port = mapbase;
 249                 unsigned long ctl = mapctl;
 250
 251                 hw.io_ports_array[0] = port;
 252 #ifdef __BIG_ENDIAN
 253                 port++;
 254                 ctl++;
 255 #endif
 256                 for (i = 1; i <= 7; i++)
 257                         hw.io_ports_array[i] =
 258                                 port + (i << pdata->ioport_shift);
 259                 hw.io_ports.ctl_addr = ctl;
 260         } else
 261                 ide_std_init_ports(&hw, mapbase, mapctl);
 262         hw.irq = irq;
 263         hw.dev = &pdev->dev;
 264
 265         pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n",
 266                 mapbase, mapctl, hw.irq);
 267         if (pdata->gbus_clock)
 268                 tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0);
 269         else
 270                 d.port_ops = NULL;
 271         ret = ide_host_add(&d, hws, &host);
 272         if (!ret)
 273                 platform_set_drvdata(pdev, host);
 274         return ret;
 275 }
 276
 277 static int __exit tx4938ide_remove(struct platform_device *pdev)
 278 {
 279         struct ide_host *host = platform_get_drvdata(pdev);
 280
 281         ide_host_remove(host);
 282         return 0;
 283 }
 284
 285 static struct platform_driver tx4938ide_driver = {
 286         .driver         = {
 287                 .name   = "tx4938ide",
 288                 .owner  = THIS_MODULE,
 289         },
 290         .remove = __exit_p(tx4938ide_remove),
 291 };
 292
 293 static int __init tx4938ide_init(void)
 294 {
 295         return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
 296 }
 297
 298 static void __exit tx4938ide_exit(void)
 299 {
 300         platform_driver_unregister(&tx4938ide_driver);
 301 }
 302
 303 module_init(tx4938ide_init);
 304 module_exit(tx4938ide_exit);
 305
 306 MODULE_DESCRIPTION("TX4938 internal IDE driver");
 307 MODULE_LICENSE("GPL");
 308 MODULE_ALIAS("platform:tx4938ide");