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 #include <asm/txx9/tx4938.h>
  19
  20 static void tx4938ide_tune_ebusc(unsigned int ebus_ch,
  21                                  unsigned int gbus_clock,
  22                                  u8 pio)
  23 {
  24         struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
  25         u64 cr = __raw_readq(&tx4938_ebuscptr->cr[ebus_ch]);
  26         unsigned int sp = (cr >> 4) & 3;
  27         unsigned int clock = gbus_clock / (4 - sp);
  28         unsigned int cycle = 1000000000 / clock;
  29         unsigned int shwt;
  30         int wt;
  31
  32         /* Minimum DIOx- active time */
  33         wt = DIV_ROUND_UP(t->act8b, cycle) - 2;
  34         /* IORDY setup time: 35ns */
  35         wt = max_t(int, wt, DIV_ROUND_UP(35, cycle));
  36         /* actual wait-cycle is max(wt & ~1, 1) */
  37         if (wt > 2 && (wt & 1))
  38                 wt++;
  39         wt &= ~1;
  40         /* Address-valid to DIOR/DIOW setup */
  41         shwt = DIV_ROUND_UP(t->setup, cycle);
  42
  43         /* -DIOx recovery time (SHWT * 4) and cycle time requirement */
  44         while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle)
  45                 shwt++;
  46         if (shwt > 7) {
  47                 pr_warning("tx4938ide: SHWT violation (%d)\n", shwt);
  48                 shwt = 7;
  49         }
  50         pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n",
  51                  ebus_ch, cycle, wt, shwt);
  52
  53         __raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt,
  54                      &tx4938_ebuscptr->cr[ebus_ch]);
  55 }
  56
  57 static void tx4938ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
  58 {
  59         ide_hwif_t *hwif = drive->hwif;
  60         struct tx4938ide_platform_info *pdata = hwif->dev->platform_data;
  61         u8 safe = pio;
  62         ide_drive_t *pair;
  63
  64         pair = ide_get_pair_dev(drive);
  65         if (pair)
  66                 safe = min(safe, ide_get_best_pio_mode(pair, 255, 5));
  67         tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe);
  68 }
  69
  70 #ifdef __BIG_ENDIAN
  71
  72 /* custom iops (independent from SWAP_IO_SPACE) */
  73 static u8 tx4938ide_inb(unsigned long port)
  74 {
  75         return __raw_readb((void __iomem *)port);
  76 }
  77
  78 static void tx4938ide_outb(u8 value, unsigned long port)
  79 {
  80         __raw_writeb(value, (void __iomem *)port);
  81 }
  82
  83 static void tx4938ide_tf_load(ide_drive_t *drive, ide_task_t *task)
  84 {
  85         ide_hwif_t *hwif = drive->hwif;
  86         struct ide_io_ports *io_ports = &hwif->io_ports;
  87         struct ide_taskfile *tf = &task->tf;
  88         u8 HIHI = task->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF;
  89
  90         if (task->tf_flags & IDE_TFLAG_FLAGGED)
  91                 HIHI = 0xFF;
  92
  93         if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
  94                 u16 data = (tf->hob_data << 8) | tf->data;
  95
  96                 /* no endian swap */
  97                 __raw_writew(data, (void __iomem *)io_ports->data_addr);
  98         }
  99
 100         if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
 101                 tx4938ide_outb(tf->hob_feature, io_ports->feature_addr);
 102         if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
 103                 tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr);
 104         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
 105                 tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr);
 106         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
 107                 tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr);
 108         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
 109                 tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr);
 110
 111         if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
 112                 tx4938ide_outb(tf->feature, io_ports->feature_addr);
 113         if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
 114                 tx4938ide_outb(tf->nsect, io_ports->nsect_addr);
 115         if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
 116                 tx4938ide_outb(tf->lbal, io_ports->lbal_addr);
 117         if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
 118                 tx4938ide_outb(tf->lbam, io_ports->lbam_addr);
 119         if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
 120                 tx4938ide_outb(tf->lbah, io_ports->lbah_addr);
 121
 122         if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
 123                 tx4938ide_outb((tf->device & HIHI) | drive->select,
 124                                io_ports->device_addr);
 125 }
 126
 127 static void tx4938ide_tf_read(ide_drive_t *drive, ide_task_t *task)
 128 {
 129         ide_hwif_t *hwif = drive->hwif;
 130         struct ide_io_ports *io_ports = &hwif->io_ports;
 131         struct ide_taskfile *tf = &task->tf;
 132
 133         if (task->tf_flags & IDE_TFLAG_IN_DATA) {
 134                 u16 data;
 135
 136                 /* no endian swap */
 137                 data = __raw_readw((void __iomem *)io_ports->data_addr);
 138                 tf->data = data & 0xff;
 139                 tf->hob_data = (data >> 8) & 0xff;
 140         }
 141
 142         /* be sure we're looking at the low order bits */
 143         tx4938ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
 144
 145         if (task->tf_flags & IDE_TFLAG_IN_FEATURE)
 146                 tf->feature = tx4938ide_inb(io_ports->feature_addr);
 147         if (task->tf_flags & IDE_TFLAG_IN_NSECT)
 148                 tf->nsect  = tx4938ide_inb(io_ports->nsect_addr);
 149         if (task->tf_flags & IDE_TFLAG_IN_LBAL)
 150                 tf->lbal   = tx4938ide_inb(io_ports->lbal_addr);
 151         if (task->tf_flags & IDE_TFLAG_IN_LBAM)
 152                 tf->lbam   = tx4938ide_inb(io_ports->lbam_addr);
 153         if (task->tf_flags & IDE_TFLAG_IN_LBAH)
 154                 tf->lbah   = tx4938ide_inb(io_ports->lbah_addr);
 155         if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
 156                 tf->device = tx4938ide_inb(io_ports->device_addr);
 157
 158         if (task->tf_flags & IDE_TFLAG_LBA48) {
 159                 tx4938ide_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
 160
 161                 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 162                         tf->hob_feature =
 163                                 tx4938ide_inb(io_ports->feature_addr);
 164                 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
 165                         tf->hob_nsect   = tx4938ide_inb(io_ports->nsect_addr);
 166                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 167                         tf->hob_lbal    = tx4938ide_inb(io_ports->lbal_addr);
 168                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 169                         tf->hob_lbam    = tx4938ide_inb(io_ports->lbam_addr);
 170                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 171                         tf->hob_lbah    = tx4938ide_inb(io_ports->lbah_addr);
 172         }
 173 }
 174
 175 static void tx4938ide_input_data_swap(ide_drive_t *drive, struct request *rq,
 176                                 void *buf, unsigned int len)
 177 {
 178         unsigned long port = drive->hwif->io_ports.data_addr;
 179         unsigned short *ptr = buf;
 180         unsigned int count = (len + 1) / 2;
 181
 182         while (count--)
 183                 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
 184         __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
 185 }
 186
 187 static void tx4938ide_output_data_swap(ide_drive_t *drive, struct request *rq,
 188                                 void *buf, unsigned int len)
 189 {
 190         unsigned long port = drive->hwif->io_ports.data_addr;
 191         unsigned short *ptr = buf;
 192         unsigned int count = (len + 1) / 2;
 193
 194         while (count--) {
 195                 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
 196                 ptr++;
 197         }
 198         __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
 199 }
 200
 201 static const struct ide_tp_ops tx4938ide_tp_ops = {
 202         .exec_command           = ide_exec_command,
 203         .read_status            = ide_read_status,
 204         .read_altstatus         = ide_read_altstatus,
 205
 206         .set_irq                = ide_set_irq,
 207
 208         .tf_load                = tx4938ide_tf_load,
 209         .tf_read                = tx4938ide_tf_read,
 210
 211         .input_data             = tx4938ide_input_data_swap,
 212         .output_data            = tx4938ide_output_data_swap,
 213 };
 214
 215 #endif  /* __BIG_ENDIAN */
 216
 217 static const struct ide_port_ops tx4938ide_port_ops = {
 218         .set_pio_mode           = tx4938ide_set_pio_mode,
 219 };
 220
 221 static const struct ide_port_info tx4938ide_port_info __initdata = {
 222         .port_ops               = &tx4938ide_port_ops,
 223 #ifdef __BIG_ENDIAN
 224         .tp_ops                 = &tx4938ide_tp_ops,
 225 #endif
 226         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
 227         .pio_mask               = ATA_PIO5,
 228         .chipset                = ide_generic,
 229 };
 230
 231 static int __init tx4938ide_probe(struct platform_device *pdev)
 232 {
 233         hw_regs_t hw;
 234         hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };
 235         struct ide_host *host;
 236         struct resource *res;
 237         struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;
 238         int irq, ret, i;
 239         unsigned long mapbase, mapctl;
 240         struct ide_port_info d = tx4938ide_port_info;
 241
 242         irq = platform_get_irq(pdev, 0);
 243         if (irq < 0)
 244                 return -ENODEV;
 245         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 246         if (!res)
 247                 return -ENODEV;
 248
 249         if (!devm_request_mem_region(&pdev->dev, res->start,
 250                                      res->end - res->start + 1, "tx4938ide"))
 251                 return -EBUSY;
 252         mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
 253                                               8 << pdata->ioport_shift);
 254         mapctl = (unsigned long)devm_ioremap(&pdev->dev,
 255                                              res->start + 0x10000 +
 256                                              (6 << pdata->ioport_shift),
 257                                              1 << pdata->ioport_shift);
 258         if (!mapbase || !mapctl)
 259                 return -EBUSY;
 260
 261         memset(&hw, 0, sizeof(hw));
 262         if (pdata->ioport_shift) {
 263                 unsigned long port = mapbase;
 264                 unsigned long ctl = mapctl;
 265
 266                 hw.io_ports_array[0] = port;
 267 #ifdef __BIG_ENDIAN
 268                 port++;
 269                 ctl++;
 270 #endif
 271                 for (i = 1; i <= 7; i++)
 272                         hw.io_ports_array[i] =
 273                                 port + (i << pdata->ioport_shift);
 274                 hw.io_ports.ctl_addr = ctl;
 275         } else
 276                 ide_std_init_ports(&hw, mapbase, mapctl);
 277         hw.irq = irq;
 278         hw.dev = &pdev->dev;
 279
 280         pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n",
 281                 mapbase, mapctl, hw.irq);
 282         if (pdata->gbus_clock)
 283                 tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0);
 284         else
 285                 d.port_ops = NULL;
 286         ret = ide_host_add(&d, hws, &host);
 287         if (!ret)
 288                 platform_set_drvdata(pdev, host);
 289         return ret;
 290 }
 291
 292 static int __exit tx4938ide_remove(struct platform_device *pdev)
 293 {
 294         struct ide_host *host = platform_get_drvdata(pdev);
 295
 296         ide_host_remove(host);
 297         return 0;
 298 }
 299
 300 static struct platform_driver tx4938ide_driver = {
 301         .driver         = {
 302                 .name   = "tx4938ide",
 303                 .owner  = THIS_MODULE,
 304         },
 305         .remove = __exit_p(tx4938ide_remove),
 306 };
 307
 308 static int __init tx4938ide_init(void)
 309 {
 310         return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
 311 }
 312
 313 static void __exit tx4938ide_exit(void)
 314 {
 315         platform_driver_unregister(&tx4938ide_driver);
 316 }
 317
 318 module_init(tx4938ide_init);
 319 module_exit(tx4938ide_exit);
 320
 321 MODULE_DESCRIPTION("TX4938 internal IDE driver");
 322 MODULE_LICENSE("GPL");
 323 MODULE_ALIAS("platform:tx4938ide");