drivers/ata/pata_winbond.c

   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
  23 struct winbond_data {
  24         unsigned long config;
  25         struct platform_device *platform_dev;
  26 };
  27
  28 static struct ata_host *winbond_host[NR_HOST];
  29 static struct winbond_data winbond_data[NR_HOST];
  30 static int nr_winbond_host;
  31
  32 #ifdef MODULE
  33 static int probe_winbond = 1;
  34 #else
  35 static int probe_winbond;
  36 #endif
  37
  38 static DEFINE_SPINLOCK(winbond_lock);
  39
  40 static 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
  49 static 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
  62 static 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
  95 static 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
 124 static struct scsi_host_template winbond_sht = {
 125         ATA_PIO_SHT(DRV_NAME),
 126 };
 127
 128 static 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
 146 static __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
 230 static __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
 262 static __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
 273 MODULE_AUTHOR("Alan Cox");
 274 MODULE_DESCRIPTION("low-level driver for Winbond VL ATA");
 275 MODULE_LICENSE("GPL");
 276 MODULE_VERSION(DRV_VERSION);
 277
 278 module_init(winbond_init);
 279 module_exit(winbond_exit);
 280
 281 module_param(probe_winbond, int, 0);
 282