target/linux/ar7/patches-2.6.32/160-vlynq_try_remote_first.patch

   1 Index: linux-2.6.32.26/drivers/vlynq/vlynq.c
   2 ===================================================================
   3 --- linux-2.6.32.26.orig/drivers/vlynq/vlynq.c  2010-11-22 10:48:20.000000000 -0800
   4 +++ linux-2.6.32.26/drivers/vlynq/vlynq.c       2010-11-28 02:56:51.972405343 -0800
   5 @@ -103,6 +103,12 @@
   6  }
   7  #endif
   8
   9 +u32 __vlynq_rev_reg(struct vlynq_regs *regs)
  10 +{
  11 +       return readl(&regs->revision);
  12 +}
  13 +EXPORT_SYMBOL(__vlynq_rev_reg);
  14 +
  15  /* Check the VLYNQ link status with a given device */
  16  static int vlynq_linked(struct vlynq_device *dev)
  17  {
  18 @@ -117,20 +123,40 @@
  19         return 0;
  20  }
  21
  22 +static volatile int vlynq_delay_value_new = 0;
  23 +
  24 +static void vlynq_delay_wait(u32 count)
  25 +{
  26 +       /* Code adopted from original vlynq driver */
  27 +       int i = 0;
  28 +       volatile int *ptr = &vlynq_delay_value_new;
  29 +       *ptr = 0;
  30 +
  31 +       /* We are assuming that the each cycle takes about
  32 +        * 23 assembly instructions. */
  33 +       for(i = 0; i < (count + 23)/23; i++)
  34 +               *ptr = *ptr + 1;
  35 +}
  36 +
  37  static void vlynq_reset(struct vlynq_device *dev)
  38  {
  39 +       u32 rtm = readl(&dev->local->revision);
  40 +
  41 +       rtm = rtm < 0x00010205 || readl(&dev->local->status) & 0x800 == 0 ?
  42 +                       0 : 0x600000;
  43 +
  44         writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET,
  45                         &dev->local->control);
  46
  47         /* Wait for the devices to finish resetting */
  48 -       msleep(5);
  49 +       vlynq_delay_wait(0xffffff);
  50
  51         /* Remove reset bit */
  52 -       writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET,
  53 +       writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET | rtm,
  54                         &dev->local->control);
  55
  56         /* Give some time for the devices to settle */
  57 -       msleep(5);
  58 +       vlynq_delay_wait(0xffffff);
  59  }
  60
  61  static void vlynq_irq_unmask(unsigned int irq)
  62 @@ -379,6 +405,61 @@
  63  }
  64  EXPORT_SYMBOL(vlynq_unregister_driver);
  65
  66 +enum vlynq_clk_src {
  67 +       vlynq_clk_external,
  68 +       vlynq_clk_local,
  69 +       vlynq_clk_remote,
  70 +       vlynq_clk_invalid,
  71 +};
  72 +
  73 +static int __vlynq_set_clocks(struct vlynq_device *dev,
  74 +                               enum vlynq_clk_src clk_dir,
  75 +                               int lclk_div, int rclk_div)
  76 +{
  77 +       u32 reg;
  78 +
  79 +       if (clk_dir == vlynq_clk_invalid) {
  80 +               printk(KERN_ERR "%s: attempt to set invalid clocking\n",
  81 +                               dev_name(&dev->dev));
  82 +               return -EINVAL;
  83 +       }
  84 +
  85 +       reg = readl(&dev->local->control);
  86 +       if (readl(&dev->local->revision) < 0x00010205) {
  87 +               if (clk_dir & vlynq_clk_local)
  88 +                       reg |= VLYNQ_CTRL_CLOCK_INT;
  89 +               else
  90 +                       reg &= ~VLYNQ_CTRL_CLOCK_INT;
  91 +       }
  92 +       reg &= ~VLYNQ_CTRL_CLOCK_MASK;
  93 +       reg |= VLYNQ_CTRL_CLOCK_DIV(lclk_div);
  94 +       writel(reg, &dev->local->control);
  95 +
  96 +       if (!vlynq_linked(dev))
  97 +               return -ENODEV;
  98 +
  99 +       printk(KERN_INFO "%s: local VLYNQ protocol rev. is 0x%08x\n",
 100 +                       dev_name(&dev->dev), readl(&dev->local->revision));
 101 +       printk(KERN_INFO "%s: remote VLYNQ protocol rev. is 0x%08x\n",
 102 +                       dev_name(&dev->dev), readl(&dev->remote->revision));
 103 +
 104 +       reg = readl(&dev->remote->control);
 105 +       if (readl(&dev->remote->revision) < 0x00010205) {
 106 +               if (clk_dir & vlynq_clk_remote)
 107 +                       reg |= VLYNQ_CTRL_CLOCK_INT;
 108 +               else
 109 +                       reg &= ~VLYNQ_CTRL_CLOCK_INT;
 110 +       }
 111 +       reg &= ~VLYNQ_CTRL_CLOCK_MASK;
 112 +       reg |= VLYNQ_CTRL_CLOCK_DIV(rclk_div);
 113 +       writel(reg, &dev->remote->control);
 114 +
 115 +       if (!vlynq_linked(dev))
 116 +               return -ENODEV;
 117 +
 118 +       return 0;
 119 +}
 120 +
 121  /*
 122   * A VLYNQ remote device can clock the VLYNQ bus master
 123   * using a dedicated clock line. In that case, both the
 124 @@ -392,29 +473,17 @@
 125         int i;
 126
 127         vlynq_reset(dev);
 128 -       for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
 129 -                       i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
 130 -               dev->dev_id ? i++ : i--) {
 131 +       for (i = dev->dev_id ? 0 : 7; dev->dev_id ? i <= 7 : i >= 0;
 132 +                       dev->dev_id ? i++ : i--) {
 133
 134                 if (!vlynq_linked(dev))
 135                         break;
 136
 137 -               writel((readl(&dev->remote->control) &
 138 -                               ~VLYNQ_CTRL_CLOCK_MASK) |
 139 -                               VLYNQ_CTRL_CLOCK_INT |
 140 -                               VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
 141 -                               &dev->remote->control);
 142 -               writel((readl(&dev->local->control)
 143 -                               & ~(VLYNQ_CTRL_CLOCK_INT |
 144 -                               VLYNQ_CTRL_CLOCK_MASK)) |
 145 -                               VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
 146 -                               &dev->local->control);
 147 -
 148 -               if (vlynq_linked(dev)) {
 149 -                       printk(KERN_DEBUG
 150 -                               "%s: using remote clock divisor %d\n",
 151 -                               dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
 152 -                       dev->divisor = i;
 153 +               if (!__vlynq_set_clocks(dev, vlynq_clk_remote, i, i)) {
 154 +                       printk(KERN_INFO
 155 +                                       "%s: using remote clock divisor %d\n",
 156 +                                       dev_name(&dev->dev), i + 1);
 157 +                       dev->divisor = i + vlynq_rdiv1;
 158                         return 0;
 159                 } else {
 160                         vlynq_reset(dev);
 161 @@ -437,21 +506,14 @@
 162
 163         vlynq_reset(dev);
 164
 165 -       for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
 166 -                       i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
 167 -               dev->dev_id ? i++ : i--) {
 168 -
 169 -               writel((readl(&dev->local->control) &
 170 -                               ~VLYNQ_CTRL_CLOCK_MASK) |
 171 -                               VLYNQ_CTRL_CLOCK_INT |
 172 -                               VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
 173 -                               &dev->local->control);
 174 -
 175 -               if (vlynq_linked(dev)) {
 176 -                       printk(KERN_DEBUG
 177 -                               "%s: using local clock divisor %d\n",
 178 -                               dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
 179 -                       dev->divisor = i;
 180 +       for (i = dev->dev_id ? 0 : 7; dev->dev_id ? i <= 7 : i >= 0;
 181 +                       dev->dev_id ? i++ : i--) {
 182 +
 183 +               if (!__vlynq_set_clocks(dev, vlynq_clk_local, i, 0)) {
 184 +                       printk(KERN_INFO
 185 +                                       "%s: using local clock divisor %d\n",
 186 +                                       dev_name(&dev->dev), i + 1);
 187 +                       dev->divisor = i + vlynq_ldiv1;
 188                         return 0;
 189                 } else {
 190                         vlynq_reset(dev);
 191 @@ -473,18 +535,10 @@
 192         if (!vlynq_linked(dev))
 193                 return -ENODEV;
 194
 195 -       writel((readl(&dev->remote->control) &
 196 -                       ~VLYNQ_CTRL_CLOCK_INT),
 197 -                       &dev->remote->control);
 198 -
 199 -       writel((readl(&dev->local->control) &
 200 -                       ~VLYNQ_CTRL_CLOCK_INT),
 201 -                       &dev->local->control);
 202 -
 203 -       if (vlynq_linked(dev)) {
 204 -               printk(KERN_DEBUG "%s: using external clock\n",
 205 -                       dev_name(&dev->dev));
 206 -                       dev->divisor = vlynq_div_external;
 207 +       if (!__vlynq_set_clocks(dev, vlynq_clk_external, 0, 0)) {
 208 +               printk(KERN_INFO "%s: using external clock\n",
 209 +                               dev_name(&dev->dev));
 210 +                               dev->divisor = vlynq_div_external;
 211                 return 0;
 212         }
 213
 214 @@ -507,18 +561,9 @@
 215                  * generation negotiated by hardware.
 216                  * Check which device is generating clocks and perform setup
 217                  * accordingly */
 218 -               if (vlynq_linked(dev) && readl(&dev->remote->control) &
 219 -                  VLYNQ_CTRL_CLOCK_INT) {
 220 -                       if (!__vlynq_try_remote(dev) ||
 221 -                               !__vlynq_try_local(dev)  ||
 222 -                               !__vlynq_try_external(dev))
 223 -                               return 0;
 224 -               } else {
 225 -                       if (!__vlynq_try_external(dev) ||
 226 -                               !__vlynq_try_local(dev)    ||
 227 -                               !__vlynq_try_remote(dev))
 228 -                               return 0;
 229 -               }
 230 +               if (!__vlynq_try_remote(dev) || !__vlynq_try_local(dev) ||
 231 +                                               !__vlynq_try_external(dev))
 232 +                       return 0;
 233                 break;
 234         case vlynq_ldiv1:
 235         case vlynq_ldiv2:
 236 @@ -528,15 +573,12 @@
 237         case vlynq_ldiv6:
 238         case vlynq_ldiv7:
 239         case vlynq_ldiv8:
 240 -               writel(VLYNQ_CTRL_CLOCK_INT |
 241 -                       VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
 242 -                       vlynq_ldiv1), &dev->local->control);
 243 -               writel(0, &dev->remote->control);
 244 -               if (vlynq_linked(dev)) {
 245 -                       printk(KERN_DEBUG
 246 -                               "%s: using local clock divisor %d\n",
 247 -                               dev_name(&dev->dev),
 248 -                               dev->divisor - vlynq_ldiv1 + 1);
 249 +               if (!__vlynq_set_clocks(dev, vlynq_clk_local, dev->divisor -
 250 +                               vlynq_ldiv1, 0)) {
 251 +                       printk(KERN_INFO
 252 +                                       "%s: using local clock divisor %d\n",
 253 +                                       dev_name(&dev->dev),
 254 +                                       dev->divisor - vlynq_ldiv1 + 1);
 255                         return 0;
 256                 }
 257                 break;
 258 @@ -548,15 +590,12 @@
 259         case vlynq_rdiv6:
 260         case vlynq_rdiv7:
 261         case vlynq_rdiv8:
 262 -               writel(0, &dev->local->control);
 263 -               writel(VLYNQ_CTRL_CLOCK_INT |
 264 -                       VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
 265 -                       vlynq_rdiv1), &dev->remote->control);
 266 -               if (vlynq_linked(dev)) {
 267 -                       printk(KERN_DEBUG
 268 -                               "%s: using remote clock divisor %d\n",
 269 -                               dev_name(&dev->dev),
 270 -                               dev->divisor - vlynq_rdiv1 + 1);
 271 +               if (!__vlynq_set_clocks(dev, vlynq_clk_remote, 0,
 272 +                               dev->divisor - vlynq_rdiv1)) {
 273 +                       printk(KERN_INFO
 274 +                                       "%s: using remote clock divisor %d\n",
 275 +                                       dev_name(&dev->dev),
 276 +                                       dev->divisor - vlynq_rdiv1 + 1);
 277                         return 0;
 278                 }
 279                 break;
 280 @@ -732,13 +771,12 @@
 281         platform_set_drvdata(pdev, dev);
 282
 283         printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
 284 -              dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
 285 -              (void *)dev->mem_start);
 286 +                       dev_name(&dev->dev), (void *)dev->regs_start,
 287 +                       dev->irq, (void *)dev->mem_start);
 288
 289         dev->dev_id = 0;
 290         dev->divisor = vlynq_div_auto;
 291 -       result = __vlynq_enable_device(dev);
 292 -       if (result == 0) {
 293 +       if (!__vlynq_enable_device(dev)) {
 294                 dev->dev_id = readl(&dev->remote->chip);
 295                 ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
 296         }
 297 Index: linux-2.6.32.26/include/linux/vlynq.h
 298 ===================================================================
 299 --- linux-2.6.32.26.orig/include/linux/vlynq.h  2010-11-22 10:48:20.000000000 -0800
 300 +++ linux-2.6.32.26/include/linux/vlynq.h       2010-11-27 12:08:39.312438011 -0800
 301 @@ -98,6 +98,7 @@
 302
 303  extern struct bus_type vlynq_bus_type;
 304
 305 +extern u32 __vlynq_rev_reg(struct vlynq_regs *regs);
 306  extern int __vlynq_register_driver(struct vlynq_driver *driver,
 307                                    struct module *owner);
 308