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 <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

3 files changed, 221 insertions, 0 deletions

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 <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+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, &regmap_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, &regmap_mmio, ctx, config);
+}
+EXPORT_SYMBOL_GPL(devm_regmap_init_mmio);
+
+MODULE_LICENSE("GPL v2");