Attachment 620821 Details for Bug 862620 – test case (derived form Linux' drivers/base/regmap/regmap.c

test case (derived form Linux' drivers/base/regmap/regmap.c

regmap_raw_read.c (text/x-c), 1.63 KB, created by Paul Bolle on 2012-10-03 12:33:07 UTC

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Creator: Paul Bolle

Created: 2012-10-03 12:33:07 UTC

Size: 1.63 KB

patch

obsolete

>#include <errno.h>
>#include <stddef.h>
>#include <stdint.h>
>
>typedef _Bool	bool;
>
>enum {
>	false	= 0,
>	true	= 1
>};
>
>enum regcache_type {
>	REGCACHE_NONE,
>};
>
>struct regmap_format {
>	size_t val_bytes;
>	void (*format_val)(void *buf, unsigned int val, unsigned int shift);
>};
>
>struct regmap;
>
>typedef void (*regmap_lock)(struct regmap *map);
>typedef void (*regmap_unlock)(struct regmap *map);
>
>struct regmap {
>	regmap_lock lock;
>	regmap_unlock unlock;
>	struct regmap_format format;
>	int reg_stride;
>	enum regcache_type cache_type;
>	uint32_t cache_bypass;
>};
>
>static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
>	unsigned int num)
>{
>	unsigned int i;
>
>	for (i = 0; i < num; i++)
>		if (!regmap_volatile(map, reg + i))
>			return false;
>
>	return true;
>}
>
>int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
>		    size_t val_len)
>{
>	size_t val_bytes = map->format.val_bytes;
>	size_t val_count = val_len / val_bytes;
>	unsigned int v;
>	int ret, i;
>
>	if (val_len % map->format.val_bytes)
>		return -EINVAL;
>	if (reg % map->reg_stride)
>		return -EINVAL;
>
>	map->lock(map);
>
>	if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
>	    map->cache_type == REGCACHE_NONE) {
>		/* Physical block read if there's no cache involved */
>		ret = _regmap_raw_read(map, reg, val, val_len);
>
>	} else {
>		/* Otherwise go word by word for the cache; should be low
>		 * cost as we expect to hit the cache.
>		 */
>		for (i = 0; i < val_count; i++) {
>			ret = _regmap_read(map, reg + (i * map->reg_stride),
>					   &v);
>			if (ret != 0)
>				goto out;
>
>			map->format.format_val(val + (i * val_bytes), v, 0);
>		}
>	}
>
> out:
>	map->unlock(map);
>
>	return ret;
>}

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Attachments on bug 862620: 620821 | 620841