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  2010-11-24 13:01:20.459985351 -0800
   4 +++ linux-2.6.32.26/drivers/vlynq/vlynq.c       2010-11-24 13:01:43.537494084 -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 +123,43 @@
  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 +       if (rtm < 0x00010200)
  42 +               return;
  43 +
  44 +       rtm = rtm < 0x00010205 || readl(&dev->local->status) & 0x800 == 0 ?
  45 +                       0 : 0x600000;
  46 +
  47         writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET,
  48                         &dev->local->control);
  49
  50         /* Wait for the devices to finish resetting */
  51 -       msleep(5);
  52 +       vlynq_delay_wait(0xffffff);
  53
  54         /* Remove reset bit */
  55 -       writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET,
  56 +       writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET | rtm,
  57                         &dev->local->control);
  58
  59         /* Give some time for the devices to settle */
  60 -       msleep(5);
  61 +       vlynq_delay_wait(0xffffff);
  62  }
  63
  64  static void vlynq_irq_unmask(unsigned int irq)
  65 @@ -379,6 +408,62 @@
  66  }
  67  EXPORT_SYMBOL(vlynq_unregister_driver);
  68
  69 +enum vlynq_clk_src {
  70 +       vlynq_clk_external,
  71 +       vlynq_clk_local,
  72 +       vlynq_clk_remote,
  73 +       vlynq_clk_invalid,
  74 +};
  75 +
  76 +static int __vlynq_set_clocks(struct vlynq_device *dev,
  77 +                               enum vlynq_clk_src clk_dir,
  78 +                               int lclk_div, int rclk_div)
  79 +{
  80 +       u32 reg;
  81 +
  82 +       if (clk_dir == vlynq_clk_invalid) {
  83 +               printk(KERN_ERR "%s: attempt to set invalid clocking\n",
  84 +                               dev_name(&dev->dev));
  85 +               return -EINVAL;
  86 +       }
  87 +
  88 +       printk(KERN_INFO "%s: local VLYNQ protocol rev. is 0x%08x\n",
  89 +                       dev_name(&dev->dev), readl(&dev->local->revision));
  90 +
  91 +       reg = readl(&dev->local->control);
  92 +       if (readl(&dev->local->revision) < 0x00010205) {
  93 +               if (clk_dir & vlynq_clk_local)
  94 +                       reg |= VLYNQ_CTRL_CLOCK_INT;
  95 +               else
  96 +                       reg &= ~VLYNQ_CTRL_CLOCK_INT;
  97 +       }
  98 +       reg &= ~VLYNQ_CTRL_CLOCK_MASK;
  99 +       reg |= VLYNQ_CTRL_CLOCK_DIV(lclk_div);
 100 +       writel(reg, &dev->local->control);
 101 +
 102 +       if (!vlynq_linked(dev))
 103 +               return -ENODEV;
 104 +
 105 +       printk(KERN_INFO "%s: remote VLYNQ protocol rev. is 0x%08x\n",
 106 +                       dev_name(&dev->dev), readl(&dev->remote->revision));
 107 +
 108 +       reg = readl(&dev->remote->control);
 109 +       if (readl(&dev->remote->revision) < 0x00010205) {
 110 +               if (clk_dir & vlynq_clk_remote)
 111 +                       reg |= VLYNQ_CTRL_CLOCK_INT;
 112 +               else
 113 +                       reg &= ~VLYNQ_CTRL_CLOCK_INT;
 114 +       }
 115 +       reg &= ~VLYNQ_CTRL_CLOCK_MASK;
 116 +       reg |= VLYNQ_CTRL_CLOCK_DIV(rclk_div);
 117 +       writel(reg, &dev->remote->control);
 118 +
 119 +       if (!vlynq_linked(dev))
 120 +               return -ENODEV;
 121 +
 122 +       return 0;
 123 +}
 124 +
 125  /*
 126   * A VLYNQ remote device can clock the VLYNQ bus master
 127   * using a dedicated clock line. In that case, both the
 128 @@ -392,29 +477,15 @@
 129         int i;
 130
 131         vlynq_reset(dev);
 132 -       for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
 133 -                       i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
 134 -               dev->dev_id ? i++ : i--) {
 135 -
 136 +       for (i = 0; i <= 7; i++) {
 137                 if (!vlynq_linked(dev))
 138                         break;
 139
 140 -               writel((readl(&dev->remote->control) &
 141 -                               ~VLYNQ_CTRL_CLOCK_MASK) |
 142 -                               VLYNQ_CTRL_CLOCK_INT |
 143 -                               VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
 144 -                               &dev->remote->control);
 145 -               writel((readl(&dev->local->control)
 146 -                               & ~(VLYNQ_CTRL_CLOCK_INT |
 147 -                               VLYNQ_CTRL_CLOCK_MASK)) |
 148 -                               VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
 149 -                               &dev->local->control);
 150 -
 151 -               if (vlynq_linked(dev)) {
 152 +               if (!__vlynq_set_clocks(dev, vlynq_clk_remote, i, i)) {
 153                         printk(KERN_DEBUG
 154 -                               "%s: using remote clock divisor %d\n",
 155 -                               dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
 156 -                       dev->divisor = i;
 157 +                                       "%s: using remote clock divisor %d\n",
 158 +                                       dev_name(&dev->dev), i + 1);
 159 +                       dev->divisor = i + vlynq_rdiv1;
 160                         return 0;
 161                 } else {
 162                         vlynq_reset(dev);
 163 @@ -437,21 +508,12 @@
 164
 165         vlynq_reset(dev);
 166
 167 -       for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
 168 -                       i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
 169 -               dev->dev_id ? i++ : i--) {
 170 -
 171 -               writel((readl(&dev->local->control) &
 172 -                               ~VLYNQ_CTRL_CLOCK_MASK) |
 173 -                               VLYNQ_CTRL_CLOCK_INT |
 174 -                               VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
 175 -                               &dev->local->control);
 176 -
 177 -               if (vlynq_linked(dev)) {
 178 +       for (i = 0; i <= 7; i++) {
 179 +               if (!__vlynq_set_clocks(dev, vlynq_clk_local, i, 0)) {
 180                         printk(KERN_DEBUG
 181 -                               "%s: using local clock divisor %d\n",
 182 -                               dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
 183 -                       dev->divisor = i;
 184 +                                       "%s: using local clock divisor %d\n",
 185 +                                       dev_name(&dev->dev), i + 1);
 186 +                       dev->divisor = i + vlynq_ldiv1;
 187                         return 0;
 188                 } else {
 189                         vlynq_reset(dev);
 190 @@ -473,18 +535,10 @@
 191         if (!vlynq_linked(dev))
 192                 return -ENODEV;
 193
 194 -       writel((readl(&dev->remote->control) &
 195 -                       ~VLYNQ_CTRL_CLOCK_INT),
 196 -                       &dev->remote->control);
 197 -
 198 -       writel((readl(&dev->local->control) &
 199 -                       ~VLYNQ_CTRL_CLOCK_INT),
 200 -                       &dev->local->control);
 201 -
 202 -       if (vlynq_linked(dev)) {
 203 +       if (!__vlynq_set_clocks(dev, vlynq_clk_external, 0, 0)) {
 204                 printk(KERN_DEBUG "%s: using external clock\n",
 205 -                       dev_name(&dev->dev));
 206 -                       dev->divisor = vlynq_div_external;
 207 +                               dev_name(&dev->dev));
 208 +                               dev->divisor = vlynq_div_external;
 209                 return 0;
 210         }
 211
 212 @@ -507,18 +561,9 @@
 213                  * generation negotiated by hardware.
 214                  * Check which device is generating clocks and perform setup
 215                  * accordingly */
 216 -               if (vlynq_linked(dev) && readl(&dev->remote->control) &
 217 -                  VLYNQ_CTRL_CLOCK_INT) {
 218 -                       if (!__vlynq_try_remote(dev) ||
 219 -                               !__vlynq_try_local(dev)  ||
 220 -                               !__vlynq_try_external(dev))
 221 -                               return 0;
 222 -               } else {
 223 -                       if (!__vlynq_try_external(dev) ||
 224 -                               !__vlynq_try_local(dev)    ||
 225 -                               !__vlynq_try_remote(dev))
 226 -                               return 0;
 227 -               }
 228 +               if (!__vlynq_try_remote(dev) || !__vlynq_try_local(dev) ||
 229 +                                               !__vlynq_try_external(dev))
 230 +                       return 0;
 231                 break;
 232         case vlynq_ldiv1:
 233         case vlynq_ldiv2:
 234 @@ -528,15 +573,12 @@
 235         case vlynq_ldiv6:
 236         case vlynq_ldiv7:
 237         case vlynq_ldiv8:
 238 -               writel(VLYNQ_CTRL_CLOCK_INT |
 239 -                       VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
 240 -                       vlynq_ldiv1), &dev->local->control);
 241 -               writel(0, &dev->remote->control);
 242 -               if (vlynq_linked(dev)) {
 243 +               if (!__vlynq_set_clocks(dev, vlynq_clk_local, dev->divisor -
 244 +                               vlynq_ldiv1, 0)) {
 245                         printk(KERN_DEBUG
 246 -                               "%s: using local clock divisor %d\n",
 247 -                               dev_name(&dev->dev),
 248 -                               dev->divisor - vlynq_ldiv1 + 1);
 249 +                                       "%s: using local clock divisor %d\n",
 250 +                                       dev_name(&dev->dev),
 251 +                                       dev->divisor - vlynq_ldiv1 + 1);
 252                         return 0;
 253                 }
 254                 break;
 255 @@ -548,15 +590,12 @@
 256         case vlynq_rdiv6:
 257         case vlynq_rdiv7:
 258         case vlynq_rdiv8:
 259 -               writel(0, &dev->local->control);
 260 -               writel(VLYNQ_CTRL_CLOCK_INT |
 261 -                       VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
 262 -                       vlynq_rdiv1), &dev->remote->control);
 263 -               if (vlynq_linked(dev)) {
 264 +               if (!__vlynq_set_clocks(dev, vlynq_clk_remote, 0,
 265 +                               dev->divisor - vlynq_rdiv1)) {
 266                         printk(KERN_DEBUG
 267 -                               "%s: using remote clock divisor %d\n",
 268 -                               dev_name(&dev->dev),
 269 -                               dev->divisor - vlynq_rdiv1 + 1);
 270 +                                       "%s: using remote clock divisor %d\n",
 271 +                                       dev_name(&dev->dev),
 272 +                                       dev->divisor - vlynq_rdiv1 + 1);
 273                         return 0;
 274                 }
 275                 break;
 276 @@ -732,13 +771,13 @@
 277         platform_set_drvdata(pdev, dev);
 278
 279         printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
 280 -              dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
 281 -              (void *)dev->mem_start);
 282 +                       dev_name(&dev->dev), (void *)dev->regs_start,
 283 +                       dev->irq, (void *)dev->mem_start);
 284
 285 -       dev->dev_id = 0;
 286         dev->divisor = vlynq_div_auto;
 287 -       result = __vlynq_enable_device(dev);
 288 -       if (result == 0) {
 289 +       if (__vlynq_enable_device(dev))
 290 +               dev->dev_id = 0;
 291 +       else {
 292                 dev->dev_id = readl(&dev->remote->chip);
 293                 ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
 294         }
 295 Index: linux-2.6.32.26/include/linux/vlynq.h
 296 ===================================================================
 297 --- linux-2.6.32.26.orig/include/linux/vlynq.h  2010-11-24 13:07:33.297487888 -0800
 298 +++ linux-2.6.32.26/include/linux/vlynq.h       2010-11-24 13:08:44.107488596 -0800
 299 @@ -98,6 +98,7 @@
 300
 301  extern struct bus_type vlynq_bus_type;
 302
 303 +extern u32 __vlynq_rev_reg(struct vlynq_regs *regs);
 304  extern int __vlynq_register_driver(struct vlynq_driver *driver,
 305                                    struct module *owner);
 306