From ecb44aec86f0a5e37142a971815f91e065645986 Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Wed, 4 Apr 2012 15:48:31 -0600 Subject: [PATCH] regmap: add MMIO bus support This is a basic memory-mapped-IO bus for regmap. It has the following features and limitations: * Registers themselves may be 8, 16, 32, or 64-bit. 64-bit is only supported on 64-bit platforms. * Register offsets are limited to precisely 32-bit. * IO is performed using readl/writel, with no provision for using the __raw_readl or readl_relaxed variants. Signed-off-by: Stephen Warren Signed-off-by: Mark Brown --- drivers/base/regmap/Kconfig | 3 + drivers/base/regmap/Makefile | 1 + drivers/base/regmap/regmap-mmio.c | 217 ++++++++++++++++++++++++++++++ include/linux/regmap.h | 6 + 4 files changed, 227 insertions(+) create mode 100644 drivers/base/regmap/regmap-mmio.c diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig index 0f6c7fb418e..9ef0a5326f1 100644 --- a/drivers/base/regmap/Kconfig +++ b/drivers/base/regmap/Kconfig @@ -14,5 +14,8 @@ config REGMAP_I2C config REGMAP_SPI tristate +config REGMAP_MMIO + tristate + config REGMAP_IRQ bool diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile index defd57963c8..5e75d1b683e 100644 --- a/drivers/base/regmap/Makefile +++ b/drivers/base/regmap/Makefile @@ -3,4 +3,5 @@ obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-lzo.o obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o +obj-$(CONFIG_REGMAP_MMIO) += regmap-mmio.o obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o diff --git a/drivers/base/regmap/regmap-mmio.c b/drivers/base/regmap/regmap-mmio.c new file mode 100644 index 00000000000..1a7b5ee11ab --- /dev/null +++ b/drivers/base/regmap/regmap-mmio.c @@ -0,0 +1,217 @@ +/* + * Register map access API - MMIO support + * + * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include +#include +#include +#include +#include + +struct regmap_mmio_context { + void __iomem *regs; + unsigned val_bytes; +}; + +static int regmap_mmio_gather_write(void *context, + const void *reg, size_t reg_size, + const void *val, size_t val_size) +{ + struct regmap_mmio_context *ctx = context; + u32 offset; + + if (reg_size != 4) + return -EIO; + if (val_size % ctx->val_bytes) + return -EIO; + + offset = be32_to_cpup(reg); + + while (val_size) { + switch (ctx->val_bytes) { + case 1: + writeb(*(u8 *)val, ctx->regs + offset); + break; + case 2: + writew(be16_to_cpup(val), ctx->regs + offset); + break; + case 4: + writel(be32_to_cpup(val), ctx->regs + offset); + break; +#ifdef CONFIG_64BIT + case 8: + writeq(be64_to_cpup(val), ctx->regs + offset); + break; +#endif + default: + /* Should be caught by regmap_mmio_check_config */ + return -EIO; + } + val_size -= ctx->val_bytes; + val += ctx->val_bytes; + offset += ctx->val_bytes; + } + + return 0; +} + +static int regmap_mmio_write(void *context, const void *data, size_t count) +{ + if (count < 4) + return -EIO; + return regmap_mmio_gather_write(context, data, 4, data + 4, count - 4); +} + +static int regmap_mmio_read(void *context, + const void *reg, size_t reg_size, + void *val, size_t val_size) +{ + struct regmap_mmio_context *ctx = context; + u32 offset; + + if (reg_size != 4) + return -EIO; + if (val_size % ctx->val_bytes) + return -EIO; + + offset = be32_to_cpup(reg); + + while (val_size) { + switch (ctx->val_bytes) { + case 1: + *(u8 *)val = readb(ctx->regs + offset); + break; + case 2: + *(u16 *)val = cpu_to_be16(readw(ctx->regs + offset)); + break; + case 4: + *(u32 *)val = cpu_to_be32(readl(ctx->regs + offset)); + break; +#ifdef CONFIG_64BIT + case 8: + *(u64 *)val = cpu_to_be32(readq(ctx->regs + offset)); + break; +#endif + default: + /* Should be caught by regmap_mmio_check_config */ + return -EIO; + } + val_size -= ctx->val_bytes; + val += ctx->val_bytes; + offset += ctx->val_bytes; + } + + return 0; +} + +static void regmap_mmio_free_context(void *context) +{ + kfree(context); +} + +static struct regmap_bus regmap_mmio = { + .fast_io = true, + .write = regmap_mmio_write, + .gather_write = regmap_mmio_gather_write, + .read = regmap_mmio_read, + .free_context = regmap_mmio_free_context, +}; + +struct regmap_mmio_context *regmap_mmio_gen_context(void __iomem *regs, + const struct regmap_config *config) +{ + struct regmap_mmio_context *ctx; + + if (config->reg_bits != 32) + return ERR_PTR(-EINVAL); + + if (config->pad_bits) + return ERR_PTR(-EINVAL); + + switch (config->val_bits) { + case 8: + case 16: + case 32: +#ifdef CONFIG_64BIT + case 64: +#endif + break; + default: + return ERR_PTR(-EINVAL); + } + + ctx = kzalloc(GFP_KERNEL, sizeof(*ctx)); + if (!ctx) + return ERR_PTR(-ENOMEM); + + ctx->regs = regs; + ctx->val_bytes = config->val_bits / 8; + + return ctx; +} + +/** + * regmap_init_mmio(): Initialise register map + * + * @dev: Device that will be interacted with + * @regs: Pointer to memory-mapped IO region + * @config: Configuration for register map + * + * The return value will be an ERR_PTR() on error or a valid pointer to + * a struct regmap. + */ +struct regmap *regmap_init_mmio(struct device *dev, + void __iomem *regs, + const struct regmap_config *config) +{ + struct regmap_mmio_context *ctx; + + ctx = regmap_mmio_gen_context(regs, config); + if (IS_ERR(ctx)) + return ERR_CAST(ctx); + + return regmap_init(dev, ®map_mmio, ctx, config); +} +EXPORT_SYMBOL_GPL(regmap_init_mmio); + +/** + * devm_regmap_init_mmio(): Initialise managed register map + * + * @dev: Device that will be interacted with + * @regs: Pointer to memory-mapped IO region + * @config: Configuration for register map + * + * The return value will be an ERR_PTR() on error or a valid pointer + * to a struct regmap. The regmap will be automatically freed by the + * device management code. + */ +struct regmap *devm_regmap_init_mmio(struct device *dev, + void __iomem *regs, + const struct regmap_config *config) +{ + struct regmap_mmio_context *ctx; + + ctx = regmap_mmio_gen_context(regs, config); + if (IS_ERR(ctx)) + return ERR_CAST(ctx); + + return devm_regmap_init(dev, ®map_mmio, ctx, config); +} +EXPORT_SYMBOL_GPL(devm_regmap_init_mmio); + +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/regmap.h b/include/linux/regmap.h index f14588a96ea..f6abc8d33d6 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -137,6 +137,9 @@ struct regmap *regmap_init_i2c(struct i2c_client *i2c, const struct regmap_config *config); struct regmap *regmap_init_spi(struct spi_device *dev, const struct regmap_config *config); +struct regmap *regmap_init_mmio(struct device *dev, + void __iomem *regs, + const struct regmap_config *config); struct regmap *devm_regmap_init(struct device *dev, const struct regmap_bus *bus, @@ -146,6 +149,9 @@ struct regmap *devm_regmap_init_i2c(struct i2c_client *i2c, const struct regmap_config *config); struct regmap *devm_regmap_init_spi(struct spi_device *dev, const struct regmap_config *config); +struct regmap *devm_regmap_init_mmio(struct device *dev, + void __iomem *regs, + const struct regmap_config *config); void regmap_exit(struct regmap *map); int regmap_reinit_cache(struct regmap *map, -- 2.43.2