/* * Register map access API * * Copyright 2011 Wolfson Microelectronics plc * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/device.h>#include <linux/slab.h>#include <linux/export.h>#include <linux/mutex.h>#include <linux/err.h> #define CREATE_TRACE_POINTS#include <trace/events/regmap.h> #include "internal.h" bool regmap_writeable(struct regmap *map, unsigned int reg){ if (map->max_register && reg > map->max_register) return false; if (map->writeable_reg) return map->writeable_reg(map->dev, reg); return true;} bool regmap_readable(struct regmap *map, unsigned int reg){ if (map->max_register && reg > map->max_register) return false; if (map->format.format_write) return false; if (map->readable_reg) return map->readable_reg(map->dev, reg); return true;} bool regmap_volatile(struct regmap *map, unsigned int reg){ if (!regmap_readable(map, reg)) return false; if (map->volatile_reg) return map->volatile_reg(map->dev, reg); return true;} bool regmap_precious(struct regmap *map, unsigned int reg){ if (!regmap_readable(map, reg)) return false; if (map->precious_reg) return map->precious_reg(map->dev, reg); return false;} 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;} static void regmap_format_2_6_write(struct regmap *map, unsigned int reg, unsigned int val){ u8 *out = map->work_buf; *out = (reg << 6) | val;} static void regmap_format_4_12_write(struct regmap *map, unsigned int reg, unsigned int val){ __be16 *out = map->work_buf; *out = cpu_to_be16((reg << 12) | val);} static void regmap_format_7_9_write(struct regmap *map, unsigned int reg, unsigned int val){ __be16 *out = map->work_buf; *out = cpu_to_be16((reg << 9) | val);} static void regmap_format_10_14_write(struct regmap *map, unsigned int reg, unsigned int val){ u8 *out = map->work_buf; out[2] = val; out[1] = (val >> 8) | (reg << 6); out[0] = reg >> 2;} static void regmap_format_8(void *buf, unsigned int val){ u8 *b = buf; b[0] = val;} static void regmap_format_16(void *buf, unsigned int val){ __be16 *b = buf; b[0] = cpu_to_be16(val);} static void regmap_format_32(void *buf, unsigned int val){ __be32 *b = buf; b[0] = cpu_to_be32(val);} static unsigned int regmap_parse_8(void *buf){ u8 *b = buf; return b[0];} static unsigned int regmap_parse_16(void *buf){ __be16 *b = buf; b[0] = be16_to_cpu(b[0]); return b[0];} static unsigned int regmap_parse_32(void *buf){ __be32 *b = buf; b[0] = be32_to_cpu(b[0]); return b[0];} /** * regmap_init(): Initialise register map * * @dev: Device that will be interacted with * @bus: Bus-specific callbacks to use with device * @config: Configuration for register map * * The return value will be an ERR_PTR() on error or a valid pointer to * a struct regmap. This function should generally not be called * directly, it should be called by bus-specific init functions. */struct regmap *regmap_init(struct device *dev, const struct regmap_bus *bus, const struct regmap_config *config){ struct regmap *map; int ret = -EINVAL; if (!bus || !config) goto err; map = kzalloc(sizeof(*map), GFP_KERNEL); if (map == NULL) { ret = -ENOMEM; goto err; } mutex_init(&map->lock); map->format.buf_size = (config->reg_bits + config->val_bits) / 8; map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); map->format.pad_bytes = config->pad_bits / 8; map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); map->format.buf_size += map->format.pad_bytes; map->dev = dev; map->bus = bus; map->max_register = config->max_register; map->writeable_reg = config->writeable_reg; map->readable_reg = config->readable_reg; map->volatile_reg = config->volatile_reg; map->precious_reg = config->precious_reg; map->cache_type = config->cache_type; if (config->read_flag_mask || config->write_flag_mask) { map->read_flag_mask = config->read_flag_mask; map->write_flag_mask = config->write_flag_mask; } else { map->read_flag_mask = bus->read_flag_mask; } switch (config->reg_bits) { case 2: switch (config->val_bits) { case 6: map->format.format_write = regmap_format_2_6_write; break; default: goto err_map; } break; case 4: switch (config->val_bits) { case 12: map->format.format_write = regmap_format_4_12_write; break; default: goto err_map; } break; case 7: switch (config->val_bits) { case 9: map->format.format_write = regmap_format_7_9_write; break; default: goto err_map; } break; case 10: switch (config->val_bits) { case 14: map->format.format_write = regmap_format_10_14_write; break; default: goto err_map; } break; case 8: map->format.format_reg = regmap_format_8; break; case 16: map->format.format_reg = regmap_format_16; break; case 32: map->format.format_reg = regmap_format_32; break; default: goto err_map; } switch (config->val_bits) { case 8: map->format.format_val = regmap_format_8; map->format.parse_val = regmap_parse_8; break; case 16: map->format.format_val = regmap_format_16; map->format.parse_val = regmap_parse_16; break; case 32: map->format.format_val = regmap_format_32; map->format.parse_val = regmap_parse_32; break; } if (!map->format.format_write && !(map->format.format_reg && map->format.format_val)) goto err_map; map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); if (map->work_buf == NULL) { ret = -ENOMEM; goto err_map; } regmap_debugfs_init(map); ret = regcache_init(map, config); if (ret < 0) goto err_free_workbuf; return map; err_free_workbuf: kfree(map->work_buf);err_map: kfree(map);err: return ERR_PTR(ret);}EXPORT_SYMBOL_GPL(regmap_init); static void devm_regmap_release(struct device *dev, void *res){ regmap_exit(*(struct regmap **)res);} /** * devm_regmap_init(): Initialise managed register map * * @dev: Device that will be interacted with * @bus: Bus-specific callbacks to use with device * @config: Configuration for register map * * The return value will be an ERR_PTR() on error or a valid pointer * to a struct regmap. This function should generally not be called * directly, it should be called by bus-specific init functions. The * map will be automatically freed by the device management code. */struct regmap *devm_regmap_init(struct device *dev, const struct regmap_bus *bus, const struct regmap_config *config){ struct regmap **ptr, *regmap; ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); if (!ptr) return ERR_PTR(-ENOMEM); regmap = regmap_init(dev, bus, config); if (!IS_ERR(regmap)) { *ptr = regmap; devres_add(dev, ptr); } else { devres_free(ptr); } return regmap;}EXPORT_SYMBOL_GPL(devm_regmap_init); /** * regmap_reinit_cache(): Reinitialise the current register cache * * @map: Register map to operate on. * @config: New configuration. Only the cache data will be used. * * Discard any existing register cache for the map and initialize a * new cache. This can be used to restore the cache to defaults or to * update the cache configuration to reflect runtime discovery of the * hardware. */int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config){ int ret; mutex_lock(&map->lock); regcache_exit(map); regmap_debugfs_exit(map); map->max_register = config->max_register; map->writeable_reg = config->writeable_reg; map->readable_reg = config->readable_reg; map->volatile_reg = config->volatile_reg; map->precious_reg = config->precious_reg; map->cache_type = config->cache_type; regmap_debugfs_init(map); map->cache_bypass = false; map->cache_only = false; ret = regcache_init(map, config); mutex_unlock(&map->lock); return ret;} /** * regmap_exit(): Free a previously allocated register map */void regmap_exit(struct regmap *map){ regcache_exit(map); regmap_debugfs_exit(map); kfree(map->work_buf); kfree(map);}EXPORT_SYMBOL_GPL(regmap_exit); static int _regmap_raw_write(struct regmap *map, unsigned int reg, const void *val, size_t val_len){ u8 *u8 = map->work_buf; void *buf; int ret = -ENOTSUPP; size_t len; int i; /* Check for unwritable registers before we start */ if (map->writeable_reg) for (i = 0; i < val_len / map->format.val_bytes; i++) if (!map->writeable_reg(map->dev, reg + i)) return -EINVAL; if (!map->cache_bypass && map->format.parse_val) { unsigned int ival; int val_bytes = map->format.val_bytes; for (i = 0; i < val_len / val_bytes; i++) { memcpy(map->work_buf, val + (i * val_bytes), val_bytes); ival = map->format.parse_val(map->work_buf); ret = regcache_write(map, reg + i, ival); if (ret) { dev_err(map->dev, "Error in caching of register: %u ret: %d\n", reg + i, ret); return ret; } } if (map->cache_only) { map->cache_dirty = true; return 0; } } map->format.format_reg(map->work_buf, reg); u8[0] |= map->write_flag_mask; trace_regmap_hw_write_start(map->dev, reg, val_len / map->format.val_bytes); /* If we're doing a single register write we can probably just * send the work_buf directly, otherwise try to do a gather * write. */ if (val == (map->work_buf + map->format.pad_bytes + map->format.reg_bytes)) ret = map->bus->write(map->dev, map->work_buf, map->format.reg_bytes + map->format.pad_bytes + val_len); else if (map->bus->gather_write) ret = map->bus->gather_write(map->dev, map->work_buf, map->format.reg_bytes + map->format.pad_bytes, val, val_len); /* If that didn't work fall back on linearising by hand. */ if (ret == -ENOTSUPP) { len = map->format.reg_bytes + map->format.pad_bytes + val_len; buf = kzalloc(len, GFP_KERNEL); if (!buf) return -ENOMEM; memcpy(buf, map->work_buf, map->format.reg_bytes); memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, val, val_len); ret = map->bus->write(map->dev, buf, len); kfree(buf); } trace_regmap_hw_write_done(map->dev, reg, val_len / map->format.val_bytes); return ret;} int _regmap_write(struct regmap *map, unsigned int reg, unsigned int val){ int ret; BUG_ON(!map->format.format_write && !map->format.format_val); if (!map->cache_bypass && map->format.format_write) { ret = regcache_write(map, reg, val); if (ret != 0) return ret; if (map->cache_only) { map->cache_dirty = true; return 0; } } trace_regmap_reg_write(map->dev, reg, val); if (map->format.format_write) { map->format.format_write(map, reg, val); trace_regmap_hw_write_start(map->dev, reg, 1); Lines 1–500 of 936. 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/* * Register map access API * * Copyright 2011 Wolfson Microelectronics plc * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/device.h> #include <linux/slab.h> #include <linux/export.h> #include <linux/mutex.h> #include <linux/err.h> #define CREATE_TRACE_POINTS #include <trace/events/regmap.h> #include "internal.h" bool regmap_writeable(struct regmap *map, unsigned int reg) { if (map->max_register && reg > map->max_register) return false; if (map->writeable_reg) return map->writeable_reg(map->dev, reg); return true; } bool regmap_readable(struct regmap *map, unsigned int reg) { if (map->max_register && reg > map->max_register) return false; if (map->format.format_write) return false; if (map->readable_reg) return map->readable_reg(map->dev, reg); return true; } bool regmap_volatile(struct regmap *map, unsigned int reg) { if (!regmap_readable(map, reg)) return false; if (map->volatile_reg) return map->volatile_reg(map->dev, reg); return true; } bool regmap_precious(struct regmap *map, unsigned int reg) { if (!regmap_readable(map, reg)) return false; if (map->precious_reg) return map->precious_reg(map->dev, reg); return false; } 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; } static void regmap_format_2_6_write(struct regmap *map, unsigned int reg, unsigned int val) { u8 *out = map->work_buf; *out = (reg << 6) | val; } static void regmap_format_4_12_write(struct regmap *map, unsigned int reg, unsigned int val) { __be16 *out = map->work_buf; *out = cpu_to_be16((reg << 12) | val); } static void regmap_format_7_9_write(struct regmap *map, unsigned int reg, unsigned int val) { __be16 *out = map->work_buf; *out = cpu_to_be16((reg << 9) | val); } static void regmap_format_10_14_write(struct regmap *map, unsigned int reg, unsigned int val) { u8 *out = map->work_buf; out[2] = val; out[1] = (val >> 8) | (reg << 6); out[0] = reg >> 2; } static void regmap_format_8(void *buf, unsigned int val) { u8 *b = buf; b[0] = val; } static void regmap_format_16(void *buf, unsigned int val) { __be16 *b = buf; b[0] = cpu_to_be16(val); } static void regmap_format_32(void *buf, unsigned int val) { __be32 *b = buf; b[0] = cpu_to_be32(val); } static unsigned int regmap_parse_8(void *buf) { u8 *b = buf; return b[0]; } static unsigned int regmap_parse_16(void *buf) { __be16 *b = buf; b[0] = be16_to_cpu(b[0]); return b[0]; } static unsigned int regmap_parse_32(void *buf) { __be32 *b = buf; b[0] = be32_to_cpu(b[0]); return b[0]; } /** * regmap_init(): Initialise register map * * @dev: Device that will be interacted with * @bus: Bus-specific callbacks to use with device * @config: Configuration for register map * * The return value will be an ERR_PTR() on error or a valid pointer to * a struct regmap. This function should generally not be called * directly, it should be called by bus-specific init functions. */ struct regmap *regmap_init(struct device *dev, const struct regmap_bus *bus, const struct regmap_config *config) { struct regmap *map; int ret = -EINVAL; if (!bus || !config) goto err; map = kzalloc(sizeof(*map), GFP_KERNEL); if (map == NULL) { ret = -ENOMEM; goto err; } mutex_init(&map->lock); map->format.buf_size = (config->reg_bits + config->val_bits) / 8; map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); map->format.pad_bytes = config->pad_bits / 8; map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8); map->format.buf_size += map->format.pad_bytes; map->dev = dev; map->bus = bus; map->max_register = config->max_register; map->writeable_reg = config->writeable_reg; map->readable_reg = config->readable_reg; map->volatile_reg = config->volatile_reg; map->precious_reg = config->precious_reg; map->cache_type = config->cache_type; if (config->read_flag_mask || config->write_flag_mask) { map->read_flag_mask = config->read_flag_mask; map->write_flag_mask = config->write_flag_mask; } else { map->read_flag_mask = bus->read_flag_mask; } switch (config->reg_bits) { case 2: switch (config->val_bits) { case 6: map->format.format_write = regmap_format_2_6_write; break; default: goto err_map; } break; case 4: switch (config->val_bits) { case 12: map->format.format_write = regmap_format_4_12_write; break; default: goto err_map; } break; case 7: switch (config->val_bits) { case 9: map->format.format_write = regmap_format_7_9_write; break; default: goto err_map; } break; case 10: switch (config->val_bits) { case 14: map->format.format_write = regmap_format_10_14_write; break; default: goto err_map; } break; case 8: map->format.format_reg = regmap_format_8; break; case 16: map->format.format_reg = regmap_format_16; break; case 32: map->format.format_reg = regmap_format_32; break; default: goto err_map; } switch (config->val_bits) { case 8: map->format.format_val = regmap_format_8; map->format.parse_val = regmap_parse_8; break; case 16: map->format.format_val = regmap_format_16; map->format.parse_val = regmap_parse_16; break; case 32: map->format.format_val = regmap_format_32; map->format.parse_val = regmap_parse_32; break; } if (!map->format.format_write && !(map->format.format_reg && map->format.format_val)) goto err_map; map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL); if (map->work_buf == NULL) { ret = -ENOMEM; goto err_map; } regmap_debugfs_init(map); ret = regcache_init(map, config); if (ret < 0) goto err_free_workbuf; return map; err_free_workbuf: kfree(map->work_buf); err_map: kfree(map); err: return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(regmap_init); static void devm_regmap_release(struct device *dev, void *res) { regmap_exit(*(struct regmap **)res); } /** * devm_regmap_init(): Initialise managed register map * * @dev: Device that will be interacted with * @bus: Bus-specific callbacks to use with device * @config: Configuration for register map * * The return value will be an ERR_PTR() on error or a valid pointer * to a struct regmap. This function should generally not be called * directly, it should be called by bus-specific init functions. The * map will be automatically freed by the device management code. */ struct regmap *devm_regmap_init(struct device *dev, const struct regmap_bus *bus, const struct regmap_config *config) { struct regmap **ptr, *regmap; ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL); if (!ptr) return ERR_PTR(-ENOMEM); regmap = regmap_init(dev, bus, config); if (!IS_ERR(regmap)) { *ptr = regmap; devres_add(dev, ptr); } else { devres_free(ptr); } return regmap; } EXPORT_SYMBOL_GPL(devm_regmap_init); /** * regmap_reinit_cache(): Reinitialise the current register cache * * @map: Register map to operate on. * @config: New configuration. Only the cache data will be used. * * Discard any existing register cache for the map and initialize a * new cache. This can be used to restore the cache to defaults or to * update the cache configuration to reflect runtime discovery of the * hardware. */ int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config) { int ret; mutex_lock(&map->lock); regcache_exit(map); regmap_debugfs_exit(map); map->max_register = config->max_register; map->writeable_reg = config->writeable_reg; map->readable_reg = config->readable_reg; map->volatile_reg = config->volatile_reg; map->precious_reg = config->precious_reg; map->cache_type = config->cache_type; regmap_debugfs_init(map); map->cache_bypass = false; map->cache_only = false; ret = regcache_init(map, config); mutex_unlock(&map->lock); return ret; } /** * regmap_exit(): Free a previously allocated register map */ void regmap_exit(struct regmap *map) { regcache_exit(map); regmap_debugfs_exit(map); kfree(map->work_buf); kfree(map); } EXPORT_SYMBOL_GPL(regmap_exit); static int _regmap_raw_write(struct regmap *map, unsigned int reg, const void *val, size_t val_len) { u8 *u8 = map->work_buf; void *buf; int ret = -ENOTSUPP; size_t len; int i; /* Check for unwritable registers before we start */ if (map->writeable_reg) for (i = 0; i < val_len / map->format.val_bytes; i++) if (!map->writeable_reg(map->dev, reg + i)) return -EINVAL; if (!map->cache_bypass && map->format.parse_val) { unsigned int ival; int val_bytes = map->format.val_bytes; for (i = 0; i < val_len / val_bytes; i++) { memcpy(map->work_buf, val + (i * val_bytes), val_bytes); ival = map->format.parse_val(map->work_buf); ret = regcache_write(map, reg + i, ival); if (ret) { dev_err(map->dev, "Error in caching of register: %u ret: %d\n", reg + i, ret); return ret; } } if (map->cache_only) { map->cache_dirty = true; return 0; } } map->format.format_reg(map->work_buf, reg); u8[0] |= map->write_flag_mask; trace_regmap_hw_write_start(map->dev, reg, val_len / map->format.val_bytes); /* If we're doing a single register write we can probably just * send the work_buf directly, otherwise try to do a gather * write. */ if (val == (map->work_buf + map->format.pad_bytes + map->format.reg_bytes)) ret = map->bus->write(map->dev, map->work_buf, map->format.reg_bytes + map->format.pad_bytes + val_len); else if (map->bus->gather_write) ret = map->bus->gather_write(map->dev, map->work_buf, map->format.reg_bytes + map->format.pad_bytes, val, val_len); /* If that didn't work fall back on linearising by hand. */ if (ret == -ENOTSUPP) { len = map->format.reg_bytes + map->format.pad_bytes + val_len; buf = kzalloc(len, GFP_KERNEL); if (!buf) return -ENOMEM; memcpy(buf, map->work_buf, map->format.reg_bytes); memcpy(buf + map->format.reg_bytes + map->format.pad_bytes, val, val_len); ret = map->bus->write(map->dev, buf, len); kfree(buf); } trace_regmap_hw_write_done(map->dev, reg, val_len / map->format.val_bytes); return ret; } int _regmap_write(struct regmap *map, unsigned int reg, unsigned int val) { int ret; BUG_ON(!map->format.format_write && !map->format.format_val); if (!map->cache_bypass && map->format.format_write) { ret = regcache_write(map, reg, val); if (ret != 0) return ret; if (map->cache_only) { map->cache_dirty = true; return 0; } } trace_regmap_reg_write(map->dev, reg, val); if (map->format.format_write) { map->format.format_write(map, reg, val); trace_regmap_hw_write_start(map->dev, reg, 1);