linux/drivers/ide/tx4938ide.c
<<
>>
Prefs
   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
  22static 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
  59static 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_t(u8, 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) */
  74static 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
  86static 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
 100static 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
 116static const struct ide_port_ops tx4938ide_port_ops = {
 117        .set_pio_mode           = tx4938ide_set_pio_mode,
 118};
 119
 120static 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
 130static 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
 190static 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
 198static struct platform_driver tx4938ide_driver = {
 199        .driver         = {
 200                .name   = "tx4938ide",
 201                .owner  = THIS_MODULE,
 202        },
 203        .remove = __exit_p(tx4938ide_remove),
 204};
 205
 206static int __init tx4938ide_init(void)
 207{
 208        return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
 209}
 210
 211static void __exit tx4938ide_exit(void)
 212{
 213        platform_driver_unregister(&tx4938ide_driver);
 214}
 215
 216module_init(tx4938ide_init);
 217module_exit(tx4938ide_exit);
 218
 219MODULE_DESCRIPTION("TX4938 internal IDE driver");
 220MODULE_LICENSE("GPL");
 221MODULE_ALIAS("platform:tx4938ide");
 222
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.