// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ImgTec IR Decoder found in PowerDown Controller.
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*
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* Copyright 2010-2014 Imagination Technologies Ltd.
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*
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* This contains core img-ir code for setting up the driver. The two interfaces
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* (raw and hardware decode) are handled separately.
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*/
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#include <linux/clk.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include "img-ir.h"
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static irqreturn_t img_ir_isr(int irq, void *dev_id)
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{
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struct img_ir_priv *priv = dev_id;
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u32 irq_status;
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spin_lock(&priv->lock);
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/* we have to clear irqs before reading */
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irq_status = img_ir_read(priv, IMG_IR_IRQ_STATUS);
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img_ir_write(priv, IMG_IR_IRQ_CLEAR, irq_status);
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/* don't handle valid data irqs if we're only interested in matches */
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irq_status &= img_ir_read(priv, IMG_IR_IRQ_ENABLE);
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/* hand off edge interrupts to raw decode handler */
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if (irq_status & IMG_IR_IRQ_EDGE && img_ir_raw_enabled(&priv->raw))
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img_ir_isr_raw(priv, irq_status);
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/* hand off hardware match interrupts to hardware decode handler */
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if (irq_status & (IMG_IR_IRQ_DATA_MATCH |
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IMG_IR_IRQ_DATA_VALID |
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IMG_IR_IRQ_DATA2_VALID) &&
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img_ir_hw_enabled(&priv->hw))
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img_ir_isr_hw(priv, irq_status);
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spin_unlock(&priv->lock);
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return IRQ_HANDLED;
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}
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static void img_ir_setup(struct img_ir_priv *priv)
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{
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/* start off with interrupts disabled */
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img_ir_write(priv, IMG_IR_IRQ_ENABLE, 0);
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img_ir_setup_raw(priv);
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img_ir_setup_hw(priv);
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if (!IS_ERR(priv->clk))
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clk_prepare_enable(priv->clk);
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}
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static void img_ir_ident(struct img_ir_priv *priv)
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{
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u32 core_rev = img_ir_read(priv, IMG_IR_CORE_REV);
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dev_info(priv->dev,
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"IMG IR Decoder (%d.%d.%d.%d) probed successfully\n",
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(core_rev & IMG_IR_DESIGNER) >> IMG_IR_DESIGNER_SHIFT,
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(core_rev & IMG_IR_MAJOR_REV) >> IMG_IR_MAJOR_REV_SHIFT,
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(core_rev & IMG_IR_MINOR_REV) >> IMG_IR_MINOR_REV_SHIFT,
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(core_rev & IMG_IR_MAINT_REV) >> IMG_IR_MAINT_REV_SHIFT);
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dev_info(priv->dev, "Modes:%s%s\n",
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img_ir_hw_enabled(&priv->hw) ? " hardware" : "",
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img_ir_raw_enabled(&priv->raw) ? " raw" : "");
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}
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static int img_ir_probe(struct platform_device *pdev)
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{
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struct img_ir_priv *priv;
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struct resource *res_regs;
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int irq, error, error2;
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/* Get resources from platform device */
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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/* Private driver data */
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priv = devm_kzalloc(&pdev->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);
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priv->dev = &pdev->dev;
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spin_lock_init(&priv->lock);
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/* Ioremap the registers */
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res_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->reg_base = devm_ioremap_resource(&pdev->dev, res_regs);
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if (IS_ERR(priv->reg_base))
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return PTR_ERR(priv->reg_base);
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/* Get core clock */
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priv->clk = devm_clk_get(&pdev->dev, "core");
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if (IS_ERR(priv->clk))
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dev_warn(&pdev->dev, "cannot get core clock resource\n");
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/* Get sys clock */
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priv->sys_clk = devm_clk_get(&pdev->dev, "sys");
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if (IS_ERR(priv->sys_clk))
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dev_warn(&pdev->dev, "cannot get sys clock resource\n");
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/*
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* Enabling the system clock before the register interface is
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* accessed. ISR shouldn't get called with Sys Clock disabled,
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* hence exiting probe with an error.
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*/
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if (!IS_ERR(priv->sys_clk)) {
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error = clk_prepare_enable(priv->sys_clk);
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if (error) {
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dev_err(&pdev->dev, "cannot enable sys clock\n");
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return error;
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}
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}
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/* Set up raw & hw decoder */
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error = img_ir_probe_raw(priv);
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error2 = img_ir_probe_hw(priv);
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if (error && error2) {
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if (error == -ENODEV)
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error = error2;
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goto err_probe;
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}
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/* Get the IRQ */
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priv->irq = irq;
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error = request_irq(priv->irq, img_ir_isr, 0, "img-ir", priv);
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if (error) {
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dev_err(&pdev->dev, "cannot register IRQ %u\n",
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priv->irq);
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error = -EIO;
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goto err_irq;
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}
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img_ir_ident(priv);
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img_ir_setup(priv);
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return 0;
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err_irq:
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img_ir_remove_hw(priv);
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img_ir_remove_raw(priv);
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err_probe:
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if (!IS_ERR(priv->sys_clk))
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clk_disable_unprepare(priv->sys_clk);
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return error;
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}
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static int img_ir_remove(struct platform_device *pdev)
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{
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struct img_ir_priv *priv = platform_get_drvdata(pdev);
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free_irq(priv->irq, priv);
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img_ir_remove_hw(priv);
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img_ir_remove_raw(priv);
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if (!IS_ERR(priv->clk))
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clk_disable_unprepare(priv->clk);
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if (!IS_ERR(priv->sys_clk))
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clk_disable_unprepare(priv->sys_clk);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(img_ir_pmops, img_ir_suspend, img_ir_resume);
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static const struct of_device_id img_ir_match[] = {
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{ .compatible = "img,ir-rev1" },
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{}
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};
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MODULE_DEVICE_TABLE(of, img_ir_match);
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static struct platform_driver img_ir_driver = {
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.driver = {
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.name = "img-ir",
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.of_match_table = img_ir_match,
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.pm = &img_ir_pmops,
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},
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.probe = img_ir_probe,
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.remove = img_ir_remove,
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};
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module_platform_driver(img_ir_driver);
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MODULE_AUTHOR("Imagination Technologies Ltd.");
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MODULE_DESCRIPTION("ImgTec IR");
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MODULE_LICENSE("GPL");
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