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272 lines
6.3 KiB
272 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* This file is part of STM32 DAC driver |
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* |
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* Copyright (C) 2017, STMicroelectronics - All Rights Reserved |
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* Author: Fabrice Gasnier <[email protected]>. |
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* |
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*/ |
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#include <linux/clk.h> |
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#include <linux/delay.h> |
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#include <linux/module.h> |
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#include <linux/of_platform.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/reset.h> |
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#include "stm32-dac-core.h" |
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/** |
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* struct stm32_dac_priv - stm32 DAC core private data |
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* @pclk: peripheral clock common for all DACs |
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* @vref: regulator reference |
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* @common: Common data for all DAC instances |
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*/ |
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struct stm32_dac_priv { |
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struct clk *pclk; |
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struct regulator *vref; |
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struct stm32_dac_common common; |
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}; |
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/** |
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* struct stm32_dac_cfg - DAC configuration |
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* @has_hfsel: DAC has high frequency control |
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*/ |
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struct stm32_dac_cfg { |
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bool has_hfsel; |
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}; |
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static struct stm32_dac_priv *to_stm32_dac_priv(struct stm32_dac_common *com) |
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{ |
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return container_of(com, struct stm32_dac_priv, common); |
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} |
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static const struct regmap_config stm32_dac_regmap_cfg = { |
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.reg_bits = 32, |
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.val_bits = 32, |
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.reg_stride = sizeof(u32), |
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.max_register = 0x3fc, |
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}; |
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static int stm32_dac_core_hw_start(struct device *dev) |
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{ |
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struct stm32_dac_common *common = dev_get_drvdata(dev); |
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struct stm32_dac_priv *priv = to_stm32_dac_priv(common); |
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int ret; |
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ret = regulator_enable(priv->vref); |
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if (ret < 0) { |
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dev_err(dev, "vref enable failed: %d\n", ret); |
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return ret; |
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} |
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ret = clk_prepare_enable(priv->pclk); |
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if (ret < 0) { |
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dev_err(dev, "pclk enable failed: %d\n", ret); |
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goto err_regulator_disable; |
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} |
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return 0; |
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err_regulator_disable: |
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regulator_disable(priv->vref); |
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return ret; |
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} |
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static void stm32_dac_core_hw_stop(struct device *dev) |
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{ |
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struct stm32_dac_common *common = dev_get_drvdata(dev); |
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struct stm32_dac_priv *priv = to_stm32_dac_priv(common); |
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clk_disable_unprepare(priv->pclk); |
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regulator_disable(priv->vref); |
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} |
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static int stm32_dac_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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const struct stm32_dac_cfg *cfg; |
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struct stm32_dac_priv *priv; |
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struct regmap *regmap; |
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struct resource *res; |
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void __iomem *mmio; |
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struct reset_control *rst; |
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int ret; |
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if (!dev->of_node) |
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return -ENODEV; |
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, &priv->common); |
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cfg = (const struct stm32_dac_cfg *) |
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of_match_device(dev->driver->of_match_table, dev)->data; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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mmio = devm_ioremap_resource(dev, res); |
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if (IS_ERR(mmio)) |
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return PTR_ERR(mmio); |
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regmap = devm_regmap_init_mmio_clk(dev, "pclk", mmio, |
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&stm32_dac_regmap_cfg); |
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if (IS_ERR(regmap)) |
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return PTR_ERR(regmap); |
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priv->common.regmap = regmap; |
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priv->pclk = devm_clk_get(dev, "pclk"); |
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if (IS_ERR(priv->pclk)) { |
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ret = PTR_ERR(priv->pclk); |
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dev_err(dev, "pclk get failed\n"); |
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return ret; |
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} |
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priv->vref = devm_regulator_get(dev, "vref"); |
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if (IS_ERR(priv->vref)) { |
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ret = PTR_ERR(priv->vref); |
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dev_err(dev, "vref get failed, %d\n", ret); |
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return ret; |
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} |
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pm_runtime_get_noresume(dev); |
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pm_runtime_set_active(dev); |
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pm_runtime_enable(dev); |
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ret = stm32_dac_core_hw_start(dev); |
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if (ret) |
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goto err_pm_stop; |
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ret = regulator_get_voltage(priv->vref); |
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if (ret < 0) { |
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dev_err(dev, "vref get voltage failed, %d\n", ret); |
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goto err_hw_stop; |
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} |
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priv->common.vref_mv = ret / 1000; |
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dev_dbg(dev, "vref+=%dmV\n", priv->common.vref_mv); |
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rst = devm_reset_control_get_optional_exclusive(dev, NULL); |
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if (rst) { |
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if (IS_ERR(rst)) { |
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ret = dev_err_probe(dev, PTR_ERR(rst), "reset get failed\n"); |
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goto err_hw_stop; |
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} |
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reset_control_assert(rst); |
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udelay(2); |
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reset_control_deassert(rst); |
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} |
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if (cfg && cfg->has_hfsel) { |
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/* When clock speed is higher than 80MHz, set HFSEL */ |
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priv->common.hfsel = (clk_get_rate(priv->pclk) > 80000000UL); |
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ret = regmap_update_bits(regmap, STM32_DAC_CR, |
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STM32H7_DAC_CR_HFSEL, |
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priv->common.hfsel ? |
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STM32H7_DAC_CR_HFSEL : 0); |
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if (ret) |
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goto err_hw_stop; |
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} |
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ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, dev); |
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if (ret < 0) { |
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dev_err(dev, "failed to populate DT children\n"); |
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goto err_hw_stop; |
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} |
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pm_runtime_put(dev); |
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return 0; |
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err_hw_stop: |
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stm32_dac_core_hw_stop(dev); |
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err_pm_stop: |
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pm_runtime_disable(dev); |
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pm_runtime_set_suspended(dev); |
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pm_runtime_put_noidle(dev); |
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return ret; |
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} |
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static int stm32_dac_remove(struct platform_device *pdev) |
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{ |
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pm_runtime_get_sync(&pdev->dev); |
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of_platform_depopulate(&pdev->dev); |
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stm32_dac_core_hw_stop(&pdev->dev); |
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pm_runtime_disable(&pdev->dev); |
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pm_runtime_set_suspended(&pdev->dev); |
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pm_runtime_put_noidle(&pdev->dev); |
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return 0; |
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} |
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static int __maybe_unused stm32_dac_core_resume(struct device *dev) |
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{ |
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struct stm32_dac_common *common = dev_get_drvdata(dev); |
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struct stm32_dac_priv *priv = to_stm32_dac_priv(common); |
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int ret; |
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if (priv->common.hfsel) { |
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/* restore hfsel (maybe lost under low power state) */ |
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ret = regmap_update_bits(priv->common.regmap, STM32_DAC_CR, |
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STM32H7_DAC_CR_HFSEL, |
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STM32H7_DAC_CR_HFSEL); |
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if (ret) |
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return ret; |
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} |
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return pm_runtime_force_resume(dev); |
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} |
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static int __maybe_unused stm32_dac_core_runtime_suspend(struct device *dev) |
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{ |
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stm32_dac_core_hw_stop(dev); |
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return 0; |
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} |
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static int __maybe_unused stm32_dac_core_runtime_resume(struct device *dev) |
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{ |
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return stm32_dac_core_hw_start(dev); |
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} |
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static const struct dev_pm_ops stm32_dac_core_pm_ops = { |
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SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, stm32_dac_core_resume) |
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SET_RUNTIME_PM_OPS(stm32_dac_core_runtime_suspend, |
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stm32_dac_core_runtime_resume, |
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NULL) |
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}; |
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static const struct stm32_dac_cfg stm32h7_dac_cfg = { |
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.has_hfsel = true, |
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}; |
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static const struct of_device_id stm32_dac_of_match[] = { |
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{ |
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.compatible = "st,stm32f4-dac-core", |
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}, { |
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.compatible = "st,stm32h7-dac-core", |
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.data = (void *)&stm32h7_dac_cfg, |
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}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, stm32_dac_of_match); |
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static struct platform_driver stm32_dac_driver = { |
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.probe = stm32_dac_probe, |
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.remove = stm32_dac_remove, |
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.driver = { |
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.name = "stm32-dac-core", |
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.of_match_table = stm32_dac_of_match, |
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.pm = &stm32_dac_core_pm_ops, |
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}, |
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}; |
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module_platform_driver(stm32_dac_driver); |
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MODULE_AUTHOR("Fabrice Gasnier <[email protected]>"); |
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MODULE_DESCRIPTION("STMicroelectronics STM32 DAC core driver"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:stm32-dac-core");
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