Merge remote-tracking branch 'regmap/topic/lock' into regmap-next
[~shefty/rdma-dev.git] / drivers / base / regmap / regmap.c
index 5d8b75255b50550e0fb7e0edb55e7b2887a45068..64eb8350a074ddc2ff14938c0c0dbfab6eacdab7 100644 (file)
@@ -530,20 +530,38 @@ struct regmap *regmap_init(struct device *dev,
        }
 
        map->range_tree = RB_ROOT;
-       for (i = 0; i < config->n_ranges; i++) {
+       for (i = 0; i < config->num_ranges; i++) {
                const struct regmap_range_cfg *range_cfg = &config->ranges[i];
                struct regmap_range_node *new;
 
                /* Sanity check */
-               if (range_cfg->range_max < range_cfg->range_min ||
-                   range_cfg->range_max > map->max_register ||
-                   range_cfg->selector_reg > map->max_register ||
-                   range_cfg->window_len == 0)
+               if (range_cfg->range_max < range_cfg->range_min) {
+                       dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
+                               range_cfg->range_max, range_cfg->range_min);
                        goto err_range;
+               }
+
+               if (range_cfg->range_max > map->max_register) {
+                       dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
+                               range_cfg->range_max, map->max_register);
+                       goto err_range;
+               }
+
+               if (range_cfg->selector_reg > map->max_register) {
+                       dev_err(map->dev,
+                               "Invalid range %d: selector out of map\n", i);
+                       goto err_range;
+               }
+
+               if (range_cfg->window_len == 0) {
+                       dev_err(map->dev, "Invalid range %d: window_len 0\n",
+                               i);
+                       goto err_range;
+               }
 
                /* Make sure, that this register range has no selector
                   or data window within its boundary */
-               for (j = 0; j < config->n_ranges; j++) {
+               for (j = 0; j < config->num_ranges; j++) {
                        unsigned sel_reg = config->ranges[j].selector_reg;
                        unsigned win_min = config->ranges[j].window_start;
                        unsigned win_max = win_min +
@@ -551,11 +569,17 @@ struct regmap *regmap_init(struct device *dev,
 
                        if (range_cfg->range_min <= sel_reg &&
                            sel_reg <= range_cfg->range_max) {
+                               dev_err(map->dev,
+                                       "Range %d: selector for %d in window\n",
+                                       i, j);
                                goto err_range;
                        }
 
                        if (!(win_max < range_cfg->range_min ||
                              win_min > range_cfg->range_max)) {
+                               dev_err(map->dev,
+                                       "Range %d: window for %d in window\n",
+                                       i, j);
                                goto err_range;
                        }
                }
@@ -566,6 +590,8 @@ struct regmap *regmap_init(struct device *dev,
                        goto err_range;
                }
 
+               new->map = map;
+               new->name = range_cfg->name;
                new->range_min = range_cfg->range_min;
                new->range_max = range_cfg->range_max;
                new->selector_reg = range_cfg->selector_reg;
@@ -575,6 +601,7 @@ struct regmap *regmap_init(struct device *dev,
                new->window_len = range_cfg->window_len;
 
                if (_regmap_range_add(map, new) == false) {
+                       dev_err(map->dev, "Failed to add range %d\n", i);
                        kfree(new);
                        goto err_range;
                }
@@ -590,7 +617,7 @@ struct regmap *regmap_init(struct device *dev,
        }
 
        ret = regcache_init(map, config);
-       if (ret < 0)
+       if (ret != 0)
                goto err_range;
 
        regmap_debugfs_init(map, config->name);
@@ -749,59 +776,57 @@ struct regmap *dev_get_regmap(struct device *dev, const char *name)
 EXPORT_SYMBOL_GPL(dev_get_regmap);
 
 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
+                              struct regmap_range_node *range,
                               unsigned int val_num)
 {
-       struct regmap_range_node *range;
        void *orig_work_buf;
        unsigned int win_offset;
        unsigned int win_page;
        bool page_chg;
        int ret;
 
-       range = _regmap_range_lookup(map, *reg);
-       if (range) {
-               win_offset = (*reg - range->range_min) % range->window_len;
-               win_page = (*reg - range->range_min) / range->window_len;
-
-               if (val_num > 1) {
-                       /* Bulk write shouldn't cross range boundary */
-                       if (*reg + val_num - 1 > range->range_max)
-                               return -EINVAL;
+       win_offset = (*reg - range->range_min) % range->window_len;
+       win_page = (*reg - range->range_min) / range->window_len;
 
-                       /* ... or single page boundary */
-                       if (val_num > range->window_len - win_offset)
-                               return -EINVAL;
-               }
+       if (val_num > 1) {
+               /* Bulk write shouldn't cross range boundary */
+               if (*reg + val_num - 1 > range->range_max)
+                       return -EINVAL;
 
-               /* It is possible to have selector register inside data window.
-                  In that case, selector register is located on every page and
-                  it needs no page switching, when accessed alone. */
-               if (val_num > 1 ||
-                   range->window_start + win_offset != range->selector_reg) {
-                       /* Use separate work_buf during page switching */
-                       orig_work_buf = map->work_buf;
-                       map->work_buf = map->selector_work_buf;
+               /* ... or single page boundary */
+               if (val_num > range->window_len - win_offset)
+                       return -EINVAL;
+       }
 
-                       ret = _regmap_update_bits(map, range->selector_reg,
-                                       range->selector_mask,
-                                       win_page << range->selector_shift,
-                                       &page_chg);
+       /* It is possible to have selector register inside data window.
+          In that case, selector register is located on every page and
+          it needs no page switching, when accessed alone. */
+       if (val_num > 1 ||
+           range->window_start + win_offset != range->selector_reg) {
+               /* Use separate work_buf during page switching */
+               orig_work_buf = map->work_buf;
+               map->work_buf = map->selector_work_buf;
 
-                       map->work_buf = orig_work_buf;
+               ret = _regmap_update_bits(map, range->selector_reg,
+                                         range->selector_mask,
+                                         win_page << range->selector_shift,
+                                         &page_chg);
 
-                       if (ret < 0)
-                               return ret;
-               }
+               map->work_buf = orig_work_buf;
 
-               *reg = range->window_start + win_offset;
+               if (ret != 0)
+                       return ret;
        }
 
+       *reg = range->window_start + win_offset;
+
        return 0;
 }
 
 static int _regmap_raw_write(struct regmap *map, unsigned int reg,
                             const void *val, size_t val_len)
 {
+       struct regmap_range_node *range;
        u8 *u8 = map->work_buf;
        void *buf;
        int ret = -ENOTSUPP;
@@ -825,7 +850,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
                                             ival);
                        if (ret) {
                                dev_err(map->dev,
-                                  "Error in caching of register: %u ret: %d\n",
+                                       "Error in caching of register: %x ret: %d\n",
                                        reg + i, ret);
                                return ret;
                        }
@@ -836,9 +861,35 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
                }
        }
 
-       ret = _regmap_select_page(map, &reg, val_len / map->format.val_bytes);
-       if (ret < 0)
-               return ret;
+       range = _regmap_range_lookup(map, reg);
+       if (range) {
+               int val_num = val_len / map->format.val_bytes;
+               int win_offset = (reg - range->range_min) % range->window_len;
+               int win_residue = range->window_len - win_offset;
+
+               /* If the write goes beyond the end of the window split it */
+               while (val_num > win_residue) {
+                       dev_dbg(map->dev, "Writing window %d/%zu\n",
+                               win_residue, val_len / map->format.val_bytes);
+                       ret = _regmap_raw_write(map, reg, val, win_residue *
+                                               map->format.val_bytes);
+                       if (ret != 0)
+                               return ret;
+
+                       reg += win_residue;
+                       val_num -= win_residue;
+                       val += win_residue * map->format.val_bytes;
+                       val_len -= win_residue * map->format.val_bytes;
+
+                       win_offset = (reg - range->range_min) %
+                               range->window_len;
+                       win_residue = range->window_len - win_offset;
+               }
+
+               ret = _regmap_select_page(map, &reg, range, val_num);
+               if (ret != 0)
+                       return ret;
+       }
 
        map->format.format_reg(map->work_buf, reg, map->reg_shift);
 
@@ -887,6 +938,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
 int _regmap_write(struct regmap *map, unsigned int reg,
                  unsigned int val)
 {
+       struct regmap_range_node *range;
        int ret;
        BUG_ON(!map->format.format_write && !map->format.format_val);
 
@@ -908,9 +960,12 @@ int _regmap_write(struct regmap *map, unsigned int reg,
        trace_regmap_reg_write(map->dev, reg, val);
 
        if (map->format.format_write) {
-               ret = _regmap_select_page(map, &reg, 1);
-               if (ret < 0)
-                       return ret;
+               range = _regmap_range_lookup(map, reg);
+               if (range) {
+                       ret = _regmap_select_page(map, &reg, range, 1);
+                       if (ret != 0)
+                               return ret;
+               }
 
                map->format.format_write(map, reg, val);
 
@@ -1066,12 +1121,17 @@ EXPORT_SYMBOL_GPL(regmap_bulk_write);
 static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
                            unsigned int val_len)
 {
+       struct regmap_range_node *range;
        u8 *u8 = map->work_buf;
        int ret;
 
-       ret = _regmap_select_page(map, &reg, val_len / map->format.val_bytes);
-       if (ret < 0)
-               return ret;
+       range = _regmap_range_lookup(map, reg);
+       if (range) {
+               ret = _regmap_select_page(map, &reg, range,
+                                         val_len / map->format.val_bytes);
+               if (ret != 0)
+                       return ret;
+       }
 
        map->format.format_reg(map->work_buf, reg, map->reg_shift);