From 0074f3f2b1e43d3cedd97e47fb6980db6d2ba79e Mon Sep 17 00:00:00 2001 From: Colin Foster Date: Sun, 13 Mar 2022 15:45:24 -0700 Subject: [PATCH 2/2] regmap: allow a defined reg_base to be added to every address There's an inconsistency that arises when a register set can be accessed internally via MMIO, or externally via SPI. The VSC7514 chip allows both modes of operation. When internally accessed, the system utilizes __iomem, devm_ioremap_resource, and devm_regmap_init_mmio. For SPI it isn't possible to utilize memory-mapped IO. To properly operate, the resource base must be added to the register before every operation. Signed-off-by: Colin Foster Link: https://lore.kernel.org/r/20220313224524.399947-3-colin.foster@in-advantage.com Signed-off-by: Mark Brown --- drivers/base/regmap/internal.h | 1 + drivers/base/regmap/regmap.c | 6 ++++++ include/linux/regmap.h | 3 +++ 3 files changed, 10 insertions(+) --- a/drivers/base/regmap/internal.h +++ b/drivers/base/regmap/internal.h @@ -63,6 +63,7 @@ struct regmap { regmap_unlock unlock; void *lock_arg; /* This is passed to lock/unlock functions */ gfp_t alloc_flags; + unsigned int reg_base; struct device *dev; /* Device we do I/O on */ void *work_buf; /* Scratch buffer used to format I/O */ --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -821,6 +821,8 @@ struct regmap *__regmap_init(struct devi else map->alloc_flags = GFP_KERNEL; + map->reg_base = config->reg_base; + map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); map->format.pad_bytes = config->pad_bits / 8; map->format.reg_downshift = config->reg_downshift; @@ -1738,6 +1740,7 @@ static int _regmap_raw_write_impl(struct return ret; } + reg += map->reg_base; reg >>= map->format.reg_downshift; map->format.format_reg(map->work_buf, reg, map->reg_shift); regmap_set_work_buf_flag_mask(map, map->format.reg_bytes, @@ -1909,6 +1912,7 @@ static int _regmap_bus_formatted_write(v return ret; } + reg += map->reg_base; reg >>= map->format.reg_downshift; map->format.format_write(map, reg, val); @@ -2351,6 +2355,7 @@ static int _regmap_raw_multi_reg_write(s unsigned int reg = regs[i].reg; unsigned int val = regs[i].def; trace_regmap_hw_write_start(map, reg, 1); + reg += map->reg_base; reg >>= map->format.reg_downshift; map->format.format_reg(u8, reg, map->reg_shift); u8 += reg_bytes + pad_bytes; @@ -2679,6 +2684,7 @@ static int _regmap_raw_read(struct regma return ret; } + reg += map->reg_base; reg >>= map->format.reg_downshift; map->format.format_reg(map->work_buf, reg, map->reg_shift); regmap_set_work_buf_flag_mask(map, map->format.reg_bytes, --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -239,6 +239,8 @@ typedef void (*regmap_unlock)(void *); * used. * @reg_downshift: The number of bits to downshift the register before * performing any operations. + * @reg_base: Value to be added to every register address before performing any + * operation. * @pad_bits: Number of bits of padding between register and value. * @val_bits: Number of bits in a register value, mandatory. * @@ -363,6 +365,7 @@ struct regmap_config { int reg_bits; int reg_stride; int reg_downshift; + unsigned int reg_base; int pad_bits; int val_bits;