Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2015 - 2016 Samsung Electronics Co., Ltd.
 *
 * Authors: Inha Song <ideal.song@samsung.com>
 *          Sylwester Nawrocki <s.nawrocki@samsung.com>
 *
 * Samsung Exynos SoC series Low Power Audio Subsystem driver.
 *
 * This module provides regmap for the Top SFR region and instantiates
 * devices for IP blocks like DMAC, I2S, UART.
 */
 
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/soc/samsung/exynos-regs-pmu.h>
#include <linux/types.h>
 
/* LPASS Top register definitions */
#define SFR_LPASS_CORE_SW_RESET		0x08
#define  LPASS_SB_SW_RESET		BIT(11)
#define  LPASS_UART_SW_RESET		BIT(10)
#define  LPASS_PCM_SW_RESET		BIT(9)
#define  LPASS_I2S_SW_RESET		BIT(8)
#define  LPASS_WDT1_SW_RESET		BIT(4)
#define  LPASS_WDT0_SW_RESET		BIT(3)
#define  LPASS_TIMER_SW_RESET		BIT(2)
#define  LPASS_MEM_SW_RESET		BIT(1)
#define  LPASS_DMA_SW_RESET		BIT(0)
 
#define SFR_LPASS_INTR_CA5_MASK		0x48
#define SFR_LPASS_INTR_CPU_MASK		0x58
#define  LPASS_INTR_APM			BIT(9)
#define  LPASS_INTR_MIF			BIT(8)
#define  LPASS_INTR_TIMER		BIT(7)
#define  LPASS_INTR_DMA			BIT(6)
#define  LPASS_INTR_GPIO		BIT(5)
#define  LPASS_INTR_I2S			BIT(4)
#define  LPASS_INTR_PCM			BIT(3)
#define  LPASS_INTR_SLIMBUS		BIT(2)
#define  LPASS_INTR_UART		BIT(1)
#define  LPASS_INTR_SFR			BIT(0)
 
struct exynos_lpass {
<------>/* pointer to the LPASS TOP regmap */
<------>struct regmap *top;
<------>struct clk *sfr0_clk;
};
 
static void exynos_lpass_core_sw_reset(struct exynos_lpass *lpass, int mask)
{
<------>unsigned int val = 0;
 
<------>regmap_read(lpass->top, SFR_LPASS_CORE_SW_RESET, &val);
 
<------>val &= ~mask;
<------>regmap_write(lpass->top, SFR_LPASS_CORE_SW_RESET, val);
 
<------>usleep_range(100, 150);
 
<------>val |= mask;
<------>regmap_write(lpass->top, SFR_LPASS_CORE_SW_RESET, val);
}
 
static void exynos_lpass_enable(struct exynos_lpass *lpass)
{
<------>clk_prepare_enable(lpass->sfr0_clk);
 
<------>/* Unmask SFR, DMA and I2S interrupt */
<------>regmap_write(lpass->top, SFR_LPASS_INTR_CA5_MASK,
<------><------>     LPASS_INTR_SFR | LPASS_INTR_DMA | LPASS_INTR_I2S);
 
<------>regmap_write(lpass->top, SFR_LPASS_INTR_CPU_MASK,
<------><------>     LPASS_INTR_SFR | LPASS_INTR_DMA | LPASS_INTR_I2S |
<------><------>     LPASS_INTR_UART);
 
<------>exynos_lpass_core_sw_reset(lpass, LPASS_I2S_SW_RESET);
<------>exynos_lpass_core_sw_reset(lpass, LPASS_DMA_SW_RESET);
<------>exynos_lpass_core_sw_reset(lpass, LPASS_MEM_SW_RESET);
<------>exynos_lpass_core_sw_reset(lpass, LPASS_UART_SW_RESET);
}
 
static void exynos_lpass_disable(struct exynos_lpass *lpass)
{
<------>/* Mask any unmasked IP interrupt sources */
<------>regmap_write(lpass->top, SFR_LPASS_INTR_CPU_MASK, 0);
<------>regmap_write(lpass->top, SFR_LPASS_INTR_CA5_MASK, 0);
 
<------>clk_disable_unprepare(lpass->sfr0_clk);
}
 
static const struct regmap_config exynos_lpass_reg_conf = {
<------>.reg_bits	= 32,
<------>.reg_stride	= 4,
<------>.val_bits	= 32,
<------>.max_register	= 0xfc,
<------>.fast_io	= true,
};
 
static int exynos_lpass_probe(struct platform_device *pdev)
{
<------>struct device *dev = &pdev->dev;
<------>struct exynos_lpass *lpass;
<------>void __iomem *base_top;
<------>struct resource *res;
 
<------>lpass = devm_kzalloc(dev, sizeof(*lpass), GFP_KERNEL);
<------>if (!lpass)
<------><------>return -ENOMEM;
 
<------>res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
<------>base_top = devm_ioremap_resource(dev, res);
<------>if (IS_ERR(base_top))
<------><------>return PTR_ERR(base_top);
 
<------>lpass->sfr0_clk = devm_clk_get(dev, "sfr0_ctrl");
<------>if (IS_ERR(lpass->sfr0_clk))
<------><------>return PTR_ERR(lpass->sfr0_clk);
 
<------>lpass->top = regmap_init_mmio(dev, base_top,
<------><------><------><------><------>&exynos_lpass_reg_conf);
<------>if (IS_ERR(lpass->top)) {
<------><------>dev_err(dev, "LPASS top regmap initialization failed\n");
<------><------>return PTR_ERR(lpass->top);
<------>}
 
<------>platform_set_drvdata(pdev, lpass);
<------>pm_runtime_set_active(dev);
<------>pm_runtime_enable(dev);
<------>exynos_lpass_enable(lpass);
 
<------>return devm_of_platform_populate(dev);
}
 
static int exynos_lpass_remove(struct platform_device *pdev)
{
<------>struct exynos_lpass *lpass = platform_get_drvdata(pdev);
 
<------>exynos_lpass_disable(lpass);
<------>pm_runtime_disable(&pdev->dev);
<------>if (!pm_runtime_status_suspended(&pdev->dev))
<------><------>exynos_lpass_disable(lpass);
<------>regmap_exit(lpass->top);
 
<------>return 0;
}
 
static int __maybe_unused exynos_lpass_suspend(struct device *dev)
{
<------>struct exynos_lpass *lpass = dev_get_drvdata(dev);
 
<------>exynos_lpass_disable(lpass);
 
<------>return 0;
}
 
static int __maybe_unused exynos_lpass_resume(struct device *dev)
{
<------>struct exynos_lpass *lpass = dev_get_drvdata(dev);
 
<------>exynos_lpass_enable(lpass);
 
<------>return 0;
}
 
static const struct dev_pm_ops lpass_pm_ops = {
<------>SET_RUNTIME_PM_OPS(exynos_lpass_suspend, exynos_lpass_resume, NULL)
<------>SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
<------><------><------><------>     pm_runtime_force_resume)
};
 
static const struct of_device_id exynos_lpass_of_match[] = {
<------>{ .compatible = "samsung,exynos5433-lpass" },
<------>{ },
};
MODULE_DEVICE_TABLE(of, exynos_lpass_of_match);
 
static struct platform_driver exynos_lpass_driver = {
<------>.driver = {
<------><------>.name		= "exynos-lpass",
<------><------>.pm		= &lpass_pm_ops,
<------><------>.of_match_table	= exynos_lpass_of_match,
<------>},
<------>.probe	= exynos_lpass_probe,
<------>.remove	= exynos_lpass_remove,
};
module_platform_driver(exynos_lpass_driver);
 
MODULE_DESCRIPTION("Samsung Low Power Audio Subsystem driver");
MODULE_LICENSE("GPL v2");