LXR linux/sound/soc/sunxi/sun8i-adda-pr-regmap.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * This driver provides regmap to access to analog part of audio codec
   4 * found on Allwinner A23, A31s, A33, H3 and A64 Socs
   5 *
   6 * Copyright 2016 Chen-Yu Tsai <wens@csie.org>
   7 * Copyright (C) 2018 Vasily Khoruzhick <anarsoul@gmail.com>
   8 */
   9
  10#include <linux/io.h>
  11#include <linux/kernel.h>
  12#include <linux/module.h>
  13#include <linux/regmap.h>
  14
  15#include "sun8i-adda-pr-regmap.h"
  16
  17/* Analog control register access bits */
  18#define ADDA_PR                 0x0             /* PRCM base + 0x1c0 */
  19#define ADDA_PR_RESET                   BIT(28)
  20#define ADDA_PR_WRITE                   BIT(24)
  21#define ADDA_PR_ADDR_SHIFT              16
  22#define ADDA_PR_ADDR_MASK               GENMASK(4, 0)
  23#define ADDA_PR_DATA_IN_SHIFT           8
  24#define ADDA_PR_DATA_IN_MASK            GENMASK(7, 0)
  25#define ADDA_PR_DATA_OUT_SHIFT          0
  26#define ADDA_PR_DATA_OUT_MASK           GENMASK(7, 0)
  27
  28/* regmap access bits */
  29static int adda_reg_read(void *context, unsigned int reg, unsigned int *val)
  30{
  31        void __iomem *base = (void __iomem *)context;
  32        u32 tmp;
  33
  34        /* De-assert reset */
  35        writel(readl(base) | ADDA_PR_RESET, base);
  36
  37        /* Clear write bit */
  38        writel(readl(base) & ~ADDA_PR_WRITE, base);
  39
  40        /* Set register address */
  41        tmp = readl(base);
  42        tmp &= ~(ADDA_PR_ADDR_MASK << ADDA_PR_ADDR_SHIFT);
  43        tmp |= (reg & ADDA_PR_ADDR_MASK) << ADDA_PR_ADDR_SHIFT;
  44        writel(tmp, base);
  45
  46        /* Read back value */
  47        *val = readl(base) & ADDA_PR_DATA_OUT_MASK;
  48
  49        return 0;
  50}
  51
  52static int adda_reg_write(void *context, unsigned int reg, unsigned int val)
  53{
  54        void __iomem *base = (void __iomem *)context;
  55        u32 tmp;
  56
  57        /* De-assert reset */
  58        writel(readl(base) | ADDA_PR_RESET, base);
  59
  60        /* Set register address */
  61        tmp = readl(base);
  62        tmp &= ~(ADDA_PR_ADDR_MASK << ADDA_PR_ADDR_SHIFT);
  63        tmp |= (reg & ADDA_PR_ADDR_MASK) << ADDA_PR_ADDR_SHIFT;
  64        writel(tmp, base);
  65
  66        /* Set data to write */
  67        tmp = readl(base);
  68        tmp &= ~(ADDA_PR_DATA_IN_MASK << ADDA_PR_DATA_IN_SHIFT);
  69        tmp |= (val & ADDA_PR_DATA_IN_MASK) << ADDA_PR_DATA_IN_SHIFT;
  70        writel(tmp, base);
  71
  72        /* Set write bit to signal a write */
  73        writel(readl(base) | ADDA_PR_WRITE, base);
  74
  75        /* Clear write bit */
  76        writel(readl(base) & ~ADDA_PR_WRITE, base);
  77
  78        return 0;
  79}
  80
  81static const struct regmap_config adda_pr_regmap_cfg = {
  82        .name           = "adda-pr",
  83        .reg_bits       = 5,
  84        .reg_stride     = 1,
  85        .val_bits       = 8,
  86        .reg_read       = adda_reg_read,
  87        .reg_write      = adda_reg_write,
  88        .fast_io        = true,
  89        .max_register   = 31,
  90};
  91
  92struct regmap *sun8i_adda_pr_regmap_init(struct device *dev,
  93                                         void __iomem *base)
  94{
  95        return devm_regmap_init(dev, NULL, base, &adda_pr_regmap_cfg);
  96}
  97EXPORT_SYMBOL_GPL(sun8i_adda_pr_regmap_init);
  98
  99MODULE_DESCRIPTION("Allwinner analog audio codec regmap driver");
 100MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
 101MODULE_LICENSE("GPL");
 102MODULE_ALIAS("platform:sunxi-adda-pr");
 103