drivers/ata/pata_winbond.c

   1 /*
   2  *    pata_winbond.c - Winbond VLB ATA controllers
   3  *      (C) 2006 Red Hat <alan@redhat.com>
   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/pci.h>
  12 #include <linux/init.h>
  13 #include <linux/blkdev.h>
  14 #include <linux/delay.h>
  15 #include <scsi/scsi_host.h>
  16 #include <linux/libata.h>
  17 #include <linux/platform_device.h>
  18
  19 #define DRV_NAME "pata_winbond"
  20 #define DRV_VERSION "0.0.1"
  21
  22 #define NR_HOST 4       /* Two winbond controllers, two channels each */
  23
  24 struct winbond_data {
  25         unsigned long config;
  26         struct platform_device *platform_dev;
  27 };
  28
  29 static struct ata_host *winbond_host[NR_HOST];
  30 static struct winbond_data winbond_data[NR_HOST];
  31 static int nr_winbond_host;
  32
  33 #ifdef MODULE
  34 static int probe_winbond = 1;
  35 #else
  36 static int probe_winbond;
  37 #endif
  38
  39 static spinlock_t winbond_lock = SPIN_LOCK_UNLOCKED;
  40
  41 static void winbond_writecfg(unsigned long port, u8 reg, u8 val)
  42 {
  43         unsigned long flags;
  44         spin_lock_irqsave(&winbond_lock, flags);
  45         outb(reg, port + 0x01);
  46         outb(val, port + 0x02);
  47         spin_unlock_irqrestore(&winbond_lock, flags);
  48 }
  49
  50 static u8 winbond_readcfg(unsigned long port, u8 reg)
  51 {
  52         u8 val;
  53
  54         unsigned long flags;
  55         spin_lock_irqsave(&winbond_lock, flags);
  56         outb(reg, port + 0x01);
  57         val = inb(port + 0x02);
  58         spin_unlock_irqrestore(&winbond_lock, flags);
  59
  60         return val;
  61 }
  62
  63 static void winbond_set_piomode(struct ata_port *ap, struct ata_device *adev)
  64 {
  65         struct ata_timing t;
  66         struct winbond_data *winbond = ap->host->private_data;
  67         int active, recovery;
  68         u8 reg;
  69         int timing = 0x88 + (ap->port_no * 4) + (adev->devno * 2);
  70
  71         reg = winbond_readcfg(winbond->config, 0x81);
  72
  73         /* Get the timing data in cycles */
  74         if (reg & 0x40)         /* Fast VLB bus, assume 50MHz */
  75                 ata_timing_compute(adev, adev->pio_mode, &t, 20000, 1000);
  76         else
  77                 ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);
  78
  79         active = (FIT(t.active, 3, 17) - 1) & 0x0F;
  80         recovery = (FIT(t.recover, 1, 15) + 1) & 0x0F;
  81         timing = (active << 4) | recovery;
  82         winbond_writecfg(winbond->config, timing, reg);
  83
  84         /* Load the setup timing */
  85
  86         reg = 0x35;
  87         if (adev->class != ATA_DEV_ATA)
  88                 reg |= 0x08;    /* FIFO off */
  89         if (!ata_pio_need_iordy(adev))
  90                 reg |= 0x02;    /* IORDY off */
  91         reg |= (FIT(t.setup, 0, 3) << 6);
  92         winbond_writecfg(winbond->config, timing + 1, reg);
  93 }
  94
  95
  96 static void winbond_data_xfer(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data)
  97 {
  98         struct ata_port *ap = adev->ap;
  99         int slop = buflen & 3;
 100
 101         if (ata_id_has_dword_io(adev->id)) {
 102                 if (write_data)
 103                         outsl(ap->ioaddr.data_addr, buf, buflen >> 2);
 104                 else
 105                         insl(ap->ioaddr.data_addr, buf, buflen >> 2);
 106
 107                 if (unlikely(slop)) {
 108                         u32 pad;
 109                         if (write_data) {
 110                                 memcpy(&pad, buf + buflen - slop, slop);
 111                                 outl(le32_to_cpu(pad), ap->ioaddr.data_addr);
 112                         } else {
 113                                 pad = cpu_to_le16(inl(ap->ioaddr.data_addr));
 114                                 memcpy(buf + buflen - slop, &pad, slop);
 115                         }
 116                 }
 117         } else
 118                 ata_pio_data_xfer(adev, buf, buflen, write_data);
 119 }
 120
 121 static struct scsi_host_template winbond_sht = {
 122         .module                 = THIS_MODULE,
 123         .name                   = DRV_NAME,
 124         .ioctl                  = ata_scsi_ioctl,
 125         .queuecommand           = ata_scsi_queuecmd,
 126         .can_queue              = ATA_DEF_QUEUE,
 127         .this_id                = ATA_SHT_THIS_ID,
 128         .sg_tablesize           = LIBATA_MAX_PRD,
 129         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 130         .emulated               = ATA_SHT_EMULATED,
 131         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 132         .proc_name              = DRV_NAME,
 133         .dma_boundary           = ATA_DMA_BOUNDARY,
 134         .slave_configure        = ata_scsi_slave_config,
 135         .slave_destroy          = ata_scsi_slave_destroy,
 136         .bios_param             = ata_std_bios_param,
 137 };
 138
 139 static struct ata_port_operations winbond_port_ops = {
 140         .port_disable   = ata_port_disable,
 141         .set_piomode    = winbond_set_piomode,
 142
 143         .tf_load        = ata_tf_load,
 144         .tf_read        = ata_tf_read,
 145         .check_status   = ata_check_status,
 146         .exec_command   = ata_exec_command,
 147         .dev_select     = ata_std_dev_select,
 148
 149         .freeze         = ata_bmdma_freeze,
 150         .thaw           = ata_bmdma_thaw,
 151         .error_handler  = ata_bmdma_error_handler,
 152         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 153
 154         .qc_prep        = ata_qc_prep,
 155         .qc_issue       = ata_qc_issue_prot,
 156
 157         .data_xfer      = winbond_data_xfer,
 158
 159         .irq_handler    = ata_interrupt,
 160         .irq_clear      = ata_bmdma_irq_clear,
 161
 162         .port_start     = ata_port_start,
 163         .port_stop      = ata_port_stop,
 164         .host_stop      = ata_host_stop
 165 };
 166
 167 /**
 168  *      winbond_init_one                -       attach a winbond interface
 169  *      @type: Type to display
 170  *      @io: I/O port start
 171  *      @irq: interrupt line
 172  *      @fast: True if on a > 33Mhz VLB
 173  *
 174  *      Register a VLB bus IDE interface. Such interfaces are PIO and we
 175  *      assume do not support IRQ sharing.
 176  */
 177
 178 static __init int winbond_init_one(unsigned long port)
 179 {
 180         struct ata_probe_ent ae;
 181         struct platform_device *pdev;
 182         int ret;
 183         u8 reg;
 184         int i;
 185
 186         reg = winbond_readcfg(port, 0x81);
 187         reg |= 0x80;    /* jumpered mode off */
 188         winbond_writecfg(port, 0x81, reg);
 189         reg = winbond_readcfg(port, 0x83);
 190         reg |= 0xF0;    /* local control */
 191         winbond_writecfg(port, 0x83, reg);
 192         reg = winbond_readcfg(port, 0x85);
 193         reg |= 0xF0;    /* programmable timing */
 194         winbond_writecfg(port, 0x85, reg);
 195
 196         reg = winbond_readcfg(port, 0x81);
 197
 198         if (!(reg & 0x03))              /* Disabled */
 199                 return 0;
 200
 201         for (i = 0; i < 2 ; i ++) {
 202
 203                 if (reg & (1 << i)) {
 204                         /*
 205                          *      Fill in a probe structure first of all
 206                          */
 207
 208                         pdev = platform_device_register_simple(DRV_NAME, nr_winbond_host, NULL, 0);
 209                         if (IS_ERR(pdev))
 210                                 return PTR_ERR(pdev);
 211
 212                         memset(&ae, 0, sizeof(struct ata_probe_ent));
 213                         INIT_LIST_HEAD(&ae.node);
 214                         ae.dev = &pdev->dev;
 215
 216                         ae.port_ops = &winbond_port_ops;
 217                         ae.pio_mask = 0x1F;
 218
 219                         ae.sht = &winbond_sht;
 220
 221                         ae.n_ports = 1;
 222                         ae.irq = 14 + i;
 223                         ae.irq_flags = 0;
 224                         ae.port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST;
 225                         ae.port[0].cmd_addr = 0x1F0 - (0x80 * i);
 226                         ae.port[0].altstatus_addr = ae.port[0].cmd_addr + 0x0206;
 227                         ae.port[0].ctl_addr = ae.port[0].altstatus_addr;
 228                         ata_std_ports(&ae.port[0]);
 229                         /*
 230                          *      Hook in a private data structure per channel
 231                          */
 232                         ae.private_data = &winbond_data[nr_winbond_host];
 233                         winbond_data[nr_winbond_host].config = port;
 234                         winbond_data[nr_winbond_host].platform_dev = pdev;
 235
 236                         ret = ata_device_add(&ae);
 237                         if (ret == 0) {
 238                                 platform_device_unregister(pdev);
 239                                 return -ENODEV;
 240                         }
 241                         winbond_host[nr_winbond_host++] = dev_get_drvdata(&pdev->dev);
 242                 }
 243         }
 244
 245         return 0;
 246 }
 247
 248 /**
 249  *      winbond_init            -       attach winbond interfaces
 250  *
 251  *      Attach winbond IDE interfaces by scanning the ports it may occupy.
 252  */
 253
 254 static __init int winbond_init(void)
 255 {
 256         static const unsigned long config[2] = { 0x130, 0x1B0 };
 257
 258         int ct = 0;
 259         int i;
 260
 261         if (probe_winbond == 0)
 262                 return -ENODEV;
 263
 264         /*
 265          *      Check both base addresses
 266          */
 267
 268         for (i = 0; i < 2; i++) {
 269                 if (probe_winbond & (1<<i)) {
 270                         int ret = 0;
 271                         unsigned long port = config[i];
 272
 273                         if (request_region(port, 2, "pata_winbond")) {
 274                                 ret = winbond_init_one(port);
 275                                 if(ret <= 0)
 276                                         release_region(port, 2);
 277                                 else ct+= ret;
 278                         }
 279                 }
 280         }
 281         if (ct != 0)
 282                 return 0;
 283         return -ENODEV;
 284 }
 285
 286 static __exit void winbond_exit(void)
 287 {
 288         int i;
 289
 290         for (i = 0; i < nr_winbond_host; i++) {
 291                 ata_host_remove(winbond_host[i]);
 292                 release_region(winbond_data[i].config, 2);
 293                 platform_device_unregister(winbond_data[i].platform_dev);
 294         }
 295 }
 296
 297 MODULE_AUTHOR("Alan Cox");
 298 MODULE_DESCRIPTION("low-level driver for Winbond VL ATA");
 299 MODULE_LICENSE("GPL");
 300 MODULE_VERSION(DRV_VERSION);
 301
 302 module_init(winbond_init);
 303 module_exit(winbond_exit);
 304
 305 module_param(probe_winbond, int, 0);
 306