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160 lines
3.9 KiB
160 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2014 Free Electrons |
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* Copyright (C) 2014 Atmel |
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* |
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* Author: Boris BREZILLON <[email protected]> |
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*/ |
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#include <linux/clk.h> |
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#include <linux/iopoll.h> |
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#include <linux/mfd/atmel-hlcdc.h> |
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#include <linux/mfd/core.h> |
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#include <linux/module.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#define ATMEL_HLCDC_REG_MAX (0x4000 - 0x4) |
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struct atmel_hlcdc_regmap { |
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void __iomem *regs; |
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struct device *dev; |
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}; |
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static const struct mfd_cell atmel_hlcdc_cells[] = { |
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{ |
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.name = "atmel-hlcdc-pwm", |
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.of_compatible = "atmel,hlcdc-pwm", |
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}, |
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{ |
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.name = "atmel-hlcdc-dc", |
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.of_compatible = "atmel,hlcdc-display-controller", |
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}, |
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}; |
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static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg, |
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unsigned int val) |
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{ |
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struct atmel_hlcdc_regmap *hregmap = context; |
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if (reg <= ATMEL_HLCDC_DIS) { |
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u32 status; |
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int ret; |
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ret = readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR, |
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status, |
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!(status & ATMEL_HLCDC_SIP), |
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1, 100); |
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if (ret) { |
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dev_err(hregmap->dev, |
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"Timeout! Clock domain synchronization is in progress!\n"); |
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return ret; |
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} |
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} |
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writel(val, hregmap->regs + reg); |
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return 0; |
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} |
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static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg, |
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unsigned int *val) |
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{ |
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struct atmel_hlcdc_regmap *hregmap = context; |
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*val = readl(hregmap->regs + reg); |
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return 0; |
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} |
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static const struct regmap_config atmel_hlcdc_regmap_config = { |
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.reg_bits = 32, |
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.val_bits = 32, |
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.reg_stride = 4, |
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.max_register = ATMEL_HLCDC_REG_MAX, |
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.reg_write = regmap_atmel_hlcdc_reg_write, |
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.reg_read = regmap_atmel_hlcdc_reg_read, |
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.fast_io = true, |
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}; |
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static int atmel_hlcdc_probe(struct platform_device *pdev) |
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{ |
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struct atmel_hlcdc_regmap *hregmap; |
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struct device *dev = &pdev->dev; |
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struct atmel_hlcdc *hlcdc; |
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struct resource *res; |
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hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL); |
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if (!hregmap) |
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return -ENOMEM; |
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hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL); |
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if (!hlcdc) |
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return -ENOMEM; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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hregmap->regs = devm_ioremap_resource(dev, res); |
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if (IS_ERR(hregmap->regs)) |
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return PTR_ERR(hregmap->regs); |
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hregmap->dev = &pdev->dev; |
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hlcdc->irq = platform_get_irq(pdev, 0); |
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if (hlcdc->irq < 0) |
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return hlcdc->irq; |
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hlcdc->periph_clk = devm_clk_get(dev, "periph_clk"); |
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if (IS_ERR(hlcdc->periph_clk)) { |
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dev_err(dev, "failed to get peripheral clock\n"); |
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return PTR_ERR(hlcdc->periph_clk); |
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} |
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hlcdc->sys_clk = devm_clk_get(dev, "sys_clk"); |
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if (IS_ERR(hlcdc->sys_clk)) { |
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dev_err(dev, "failed to get system clock\n"); |
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return PTR_ERR(hlcdc->sys_clk); |
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} |
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hlcdc->slow_clk = devm_clk_get(dev, "slow_clk"); |
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if (IS_ERR(hlcdc->slow_clk)) { |
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dev_err(dev, "failed to get slow clock\n"); |
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return PTR_ERR(hlcdc->slow_clk); |
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} |
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hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap, |
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&atmel_hlcdc_regmap_config); |
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if (IS_ERR(hlcdc->regmap)) |
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return PTR_ERR(hlcdc->regmap); |
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dev_set_drvdata(dev, hlcdc); |
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return devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells, |
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ARRAY_SIZE(atmel_hlcdc_cells), |
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NULL, 0, NULL); |
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} |
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static const struct of_device_id atmel_hlcdc_match[] = { |
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{ .compatible = "atmel,at91sam9n12-hlcdc" }, |
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{ .compatible = "atmel,at91sam9x5-hlcdc" }, |
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{ .compatible = "atmel,sama5d2-hlcdc" }, |
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{ .compatible = "atmel,sama5d3-hlcdc" }, |
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{ .compatible = "atmel,sama5d4-hlcdc" }, |
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{ .compatible = "microchip,sam9x60-hlcdc" }, |
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{ /* sentinel */ }, |
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}; |
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MODULE_DEVICE_TABLE(of, atmel_hlcdc_match); |
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static struct platform_driver atmel_hlcdc_driver = { |
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.probe = atmel_hlcdc_probe, |
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.driver = { |
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.name = "atmel-hlcdc", |
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.of_match_table = atmel_hlcdc_match, |
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}, |
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}; |
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module_platform_driver(atmel_hlcdc_driver); |
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MODULE_ALIAS("platform:atmel-hlcdc"); |
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MODULE_AUTHOR("Boris Brezillon <[email protected]>"); |
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MODULE_DESCRIPTION("Atmel HLCDC driver"); |
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MODULE_LICENSE("GPL v2");
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