LXR linux/drivers/ata/pata

   1/*
   2 *    pata_winbond.c - Winbond VLB ATA controllers
   3 *      (C) 2006 Red Hat
   4 *
   5 *    Support for the Winbond 83759A when operating in advanced mode.
   6 *    Multichip mode is not currently supported.
   7 */
   8
   9#include <linux/kernel.h>
  10#include <linux/module.h>
  11#include <linux/init.h>
  12#include <linux/blkdev.h>
  13#include <linux/delay.h>
  14#include <scsi/scsi_host.h>
  15#include <linux/libata.h>
  16#include <linux/platform_device.h>
  17
  18#define DRV_NAME "pata_winbond"
  19#define DRV_VERSION "0.0.3"
  20
  21#define NR_HOST 4       /* Two winbond controllers, two channels each */
  22
  23struct winbond_data {
  24        unsigned long config;
  25        struct platform_device *platform_dev;
  26};
  27
  28static struct ata_host *winbond_host[NR_HOST];
  29static struct winbond_data winbond_data[NR_HOST];
  30static int nr_winbond_host;
  31
  32#ifdef MODULE
  33static int probe_winbond = 1;
  34#else
  35static int probe_winbond;
  36#endif
  37
  38static DEFINE_SPINLOCK(winbond_lock);
  39
  40static void winbond_writecfg(unsigned long port, u8 reg, u8 val)
  41{
  42        unsigned long flags;
  43        spin_lock_irqsave(&winbond_lock, flags);
  44        outb(reg, port + 0x01);
  45        outb(val, port + 0x02);
  46        spin_unlock_irqrestore(&winbond_lock, flags);
  47}
  48
  49static u8 winbond_readcfg(unsigned long port, u8 reg)
  50{
  51        u8 val;
  52
  53        unsigned long flags;
  54        spin_lock_irqsave(&winbond_lock, flags);
  55        outb(reg, port + 0x01);
  56        val = inb(port + 0x02);
  57        spin_unlock_irqrestore(&winbond_lock, flags);
  58
  59        return val;
  60}
  61
  62static void winbond_set_piomode(struct ata_port *ap, struct ata_device *adev)
  63{
  64        struct ata_timing t;
  65        struct winbond_data *winbond = ap->host->private_data;
  66        int active, recovery;
  67        u8 reg;
  68        int timing = 0x88 + (ap->port_no * 4) + (adev->devno * 2);
  69
  70        reg = winbond_readcfg(winbond->config, 0x81);
  71
  72        /* Get the timing data in cycles */
  73        if (reg & 0x40)         /* Fast VLB bus, assume 50MHz */
  74                ata_timing_compute(adev, adev->pio_mode, &t, 20000, 1000);
  75        else
  76                ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);
  77
  78        active = (clamp_val(t.active, 3, 17) - 1) & 0x0F;
  79        recovery = (clamp_val(t.recover, 1, 15) + 1) & 0x0F;
  80        timing = (active << 4) | recovery;
  81        winbond_writecfg(winbond->config, timing, reg);
  82
  83        /* Load the setup timing */
  84
  85        reg = 0x35;
  86        if (adev->class != ATA_DEV_ATA)
  87                reg |= 0x08;    /* FIFO off */
  88        if (!ata_pio_need_iordy(adev))
  89                reg |= 0x02;    /* IORDY off */
  90        reg |= (clamp_val(t.setup, 0, 3) << 6);
  91        winbond_writecfg(winbond->config, timing + 1, reg);
  92}
  93
  94
  95static unsigned int winbond_data_xfer(struct ata_device *dev,
  96                        unsigned char *buf, unsigned int buflen, int rw)
  97{
  98        struct ata_port *ap = dev->link->ap;
  99        int slop = buflen & 3;
 100
 101        if (ata_id_has_dword_io(dev->id)) {
 102                if (rw == READ)
 103                        ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
 104                else
 105                        iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
 106
 107                if (unlikely(slop)) {
 108                        __le32 pad;
 109                        if (rw == READ) {
 110                                pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));
 111                                memcpy(buf + buflen - slop, &pad, slop);
 112                        } else {
 113                                memcpy(&pad, buf + buflen - slop, slop);
 114                                iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
 115                        }
 116                        buflen += 4 - slop;
 117                }
 118        } else
 119                buflen = ata_sff_data_xfer(dev, buf, buflen, rw);
 120
 121        return buflen;
 122}
 123
 124static struct scsi_host_template winbond_sht = {
 125        ATA_PIO_SHT(DRV_NAME),
 126};
 127
 128static struct ata_port_operations winbond_port_ops = {
 129        .inherits       = &ata_sff_port_ops,
 130        .sff_data_xfer  = winbond_data_xfer,
 131        .cable_detect   = ata_cable_40wire,
 132        .set_piomode    = winbond_set_piomode,
 133};
 134
 135/**
 136 *      winbond_init_one                -       attach a winbond interface
 137 *      @type: Type to display
 138 *      @io: I/O port start
 139 *      @irq: interrupt line
 140 *      @fast: True if on a > 33Mhz VLB
 141 *
 142 *      Register a VLB bus IDE interface. Such interfaces are PIO and we
 143 *      assume do not support IRQ sharing.
 144 */
 145
 146static __init int winbond_init_one(unsigned long port)
 147{
 148        struct platform_device *pdev;
 149        u8 reg;
 150        int i, rc;
 151
 152        reg = winbond_readcfg(port, 0x81);
 153        reg |= 0x80;    /* jumpered mode off */
 154        winbond_writecfg(port, 0x81, reg);
 155        reg = winbond_readcfg(port, 0x83);
 156        reg |= 0xF0;    /* local control */
 157        winbond_writecfg(port, 0x83, reg);
 158        reg = winbond_readcfg(port, 0x85);
 159        reg |= 0xF0;    /* programmable timing */
 160        winbond_writecfg(port, 0x85, reg);
 161
 162        reg = winbond_readcfg(port, 0x81);
 163
 164        if (!(reg & 0x03))              /* Disabled */
 165                return -ENODEV;
 166
 167        for (i = 0; i < 2 ; i ++) {
 168                unsigned long cmd_port = 0x1F0 - (0x80 * i);
 169                unsigned long ctl_port = cmd_port + 0x206;
 170                struct ata_host *host;
 171                struct ata_port *ap;
 172                void __iomem *cmd_addr, *ctl_addr;
 173
 174                if (!(reg & (1 << i)))
 175                        continue;
 176
 177                pdev = platform_device_register_simple(DRV_NAME, nr_winbond_host, NULL, 0);
 178                if (IS_ERR(pdev))
 179                        return PTR_ERR(pdev);
 180
 181                rc = -ENOMEM;
 182                host = ata_host_alloc(&pdev->dev, 1);
 183                if (!host)
 184                        goto err_unregister;
 185                ap = host->ports[0];
 186
 187                rc = -ENOMEM;
 188                cmd_addr = devm_ioport_map(&pdev->dev, cmd_port, 8);
 189                ctl_addr = devm_ioport_map(&pdev->dev, ctl_port, 1);
 190                if (!cmd_addr || !ctl_addr)
 191                        goto err_unregister;
 192
 193                ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", cmd_port, ctl_port);
 194
 195                ap->ops = &winbond_port_ops;
 196                ap->pio_mask = ATA_PIO4;
 197                ap->flags |= ATA_FLAG_SLAVE_POSS;
 198                ap->ioaddr.cmd_addr = cmd_addr;
 199                ap->ioaddr.altstatus_addr = ctl_addr;
 200                ap->ioaddr.ctl_addr = ctl_addr;
 201                ata_sff_std_ports(&ap->ioaddr);
 202
 203                /* hook in a private data structure per channel */
 204                host->private_data = &winbond_data[nr_winbond_host];
 205                winbond_data[nr_winbond_host].config = port;
 206                winbond_data[nr_winbond_host].platform_dev = pdev;
 207
 208                /* activate */
 209                rc = ata_host_activate(host, 14 + i, ata_sff_interrupt, 0,
 210                                       &winbond_sht);
 211                if (rc)
 212                        goto err_unregister;
 213
 214                winbond_host[nr_winbond_host++] = dev_get_drvdata(&pdev->dev);
 215        }
 216
 217        return 0;
 218
 219 err_unregister:
 220        platform_device_unregister(pdev);
 221        return rc;
 222}
 223
 224/**
 225 *      winbond_init            -       attach winbond interfaces
 226 *
 227 *      Attach winbond IDE interfaces by scanning the ports it may occupy.
 228 */
 229
 230static __init int winbond_init(void)
 231{
 232        static const unsigned long config[2] = { 0x130, 0x1B0 };
 233
 234        int ct = 0;
 235        int i;
 236
 237        if (probe_winbond == 0)
 238                return -ENODEV;
 239
 240        /*
 241         *      Check both base addresses
 242         */
 243
 244        for (i = 0; i < 2; i++) {
 245                if (probe_winbond & (1<<i)) {
 246                        int ret = 0;
 247                        unsigned long port = config[i];
 248
 249                        if (request_region(port, 2, "pata_winbond")) {
 250                                ret = winbond_init_one(port);
 251                                if (ret <= 0)
 252                                        release_region(port, 2);
 253                                else ct+= ret;
 254                        }
 255                }
 256        }
 257        if (ct != 0)
 258                return 0;
 259        return -ENODEV;
 260}
 261
 262static __exit void winbond_exit(void)
 263{
 264        int i;
 265
 266        for (i = 0; i < nr_winbond_host; i++) {
 267                ata_host_detach(winbond_host[i]);
 268                release_region(winbond_data[i].config, 2);
 269                platform_device_unregister(winbond_data[i].platform_dev);
 270        }
 271}
 272
 273MODULE_AUTHOR("Alan Cox");
 274MODULE_DESCRIPTION("low-level driver for Winbond VL ATA");
 275MODULE_LICENSE("GPL");
 276MODULE_VERSION(DRV_VERSION);
 277
 278module_init(winbond_init);
 279module_exit(winbond_exit);
 280
 281module_param(probe_winbond, int, 0);
 282
 283