| /* |
| * ImgTec IR Decoder found in PowerDown Controller. |
| * |
| * Copyright 2010-2014 Imagination Technologies Ltd. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| * |
| * This contains core img-ir code for setting up the driver. The two interfaces |
| * (raw and hardware decode) are handled separately. |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include "img-ir.h" |
| |
| static irqreturn_t img_ir_isr(int irq, void *dev_id) |
| { |
| struct img_ir_priv *priv = dev_id; |
| u32 irq_status; |
| |
| spin_lock(&priv->lock); |
| /* we have to clear irqs before reading */ |
| irq_status = img_ir_read(priv, IMG_IR_IRQ_STATUS); |
| img_ir_write(priv, IMG_IR_IRQ_CLEAR, irq_status); |
| |
| /* don't handle valid data irqs if we're only interested in matches */ |
| irq_status &= img_ir_read(priv, IMG_IR_IRQ_ENABLE); |
| |
| /* hand off edge interrupts to raw decode handler */ |
| if (irq_status & IMG_IR_IRQ_EDGE && img_ir_raw_enabled(&priv->raw)) |
| img_ir_isr_raw(priv, irq_status); |
| |
| /* hand off hardware match interrupts to hardware decode handler */ |
| if (irq_status & (IMG_IR_IRQ_DATA_MATCH | |
| IMG_IR_IRQ_DATA_VALID | |
| IMG_IR_IRQ_DATA2_VALID) && |
| img_ir_hw_enabled(&priv->hw)) |
| img_ir_isr_hw(priv, irq_status); |
| |
| spin_unlock(&priv->lock); |
| return IRQ_HANDLED; |
| } |
| |
| static void img_ir_setup(struct img_ir_priv *priv) |
| { |
| /* start off with interrupts disabled */ |
| img_ir_write(priv, IMG_IR_IRQ_ENABLE, 0); |
| |
| img_ir_setup_raw(priv); |
| img_ir_setup_hw(priv); |
| |
| if (!IS_ERR(priv->clk)) |
| clk_prepare_enable(priv->clk); |
| } |
| |
| static void img_ir_ident(struct img_ir_priv *priv) |
| { |
| u32 core_rev = img_ir_read(priv, IMG_IR_CORE_REV); |
| |
| dev_info(priv->dev, |
| "IMG IR Decoder (%d.%d.%d.%d) probed successfully\n", |
| (core_rev & IMG_IR_DESIGNER) >> IMG_IR_DESIGNER_SHIFT, |
| (core_rev & IMG_IR_MAJOR_REV) >> IMG_IR_MAJOR_REV_SHIFT, |
| (core_rev & IMG_IR_MINOR_REV) >> IMG_IR_MINOR_REV_SHIFT, |
| (core_rev & IMG_IR_MAINT_REV) >> IMG_IR_MAINT_REV_SHIFT); |
| dev_info(priv->dev, "Modes:%s%s\n", |
| img_ir_hw_enabled(&priv->hw) ? " hardware" : "", |
| img_ir_raw_enabled(&priv->raw) ? " raw" : ""); |
| } |
| |
| static int img_ir_probe(struct platform_device *pdev) |
| { |
| struct img_ir_priv *priv; |
| struct resource *res_regs; |
| int irq, error, error2; |
| |
| /* Get resources from platform device */ |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) { |
| dev_err(&pdev->dev, "cannot find IRQ resource\n"); |
| return irq; |
| } |
| |
| /* Private driver data */ |
| priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
| if (!priv) |
| return -ENOMEM; |
| |
| platform_set_drvdata(pdev, priv); |
| priv->dev = &pdev->dev; |
| spin_lock_init(&priv->lock); |
| |
| /* Ioremap the registers */ |
| res_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| priv->reg_base = devm_ioremap_resource(&pdev->dev, res_regs); |
| if (IS_ERR(priv->reg_base)) |
| return PTR_ERR(priv->reg_base); |
| |
| /* Get core clock */ |
| priv->clk = devm_clk_get(&pdev->dev, "core"); |
| if (IS_ERR(priv->clk)) |
| dev_warn(&pdev->dev, "cannot get core clock resource\n"); |
| |
| /* Get sys clock */ |
| priv->sys_clk = devm_clk_get(&pdev->dev, "sys"); |
| if (IS_ERR(priv->sys_clk)) |
| dev_warn(&pdev->dev, "cannot get sys clock resource\n"); |
| /* |
| * Enabling the system clock before the register interface is |
| * accessed. ISR shouldn't get called with Sys Clock disabled, |
| * hence exiting probe with an error. |
| */ |
| if (!IS_ERR(priv->sys_clk)) { |
| error = clk_prepare_enable(priv->sys_clk); |
| if (error) { |
| dev_err(&pdev->dev, "cannot enable sys clock\n"); |
| return error; |
| } |
| } |
| |
| /* Set up raw & hw decoder */ |
| error = img_ir_probe_raw(priv); |
| error2 = img_ir_probe_hw(priv); |
| if (error && error2) { |
| if (error == -ENODEV) |
| error = error2; |
| goto err_probe; |
| } |
| |
| /* Get the IRQ */ |
| priv->irq = irq; |
| error = request_irq(priv->irq, img_ir_isr, 0, "img-ir", priv); |
| if (error) { |
| dev_err(&pdev->dev, "cannot register IRQ %u\n", |
| priv->irq); |
| error = -EIO; |
| goto err_irq; |
| } |
| |
| img_ir_ident(priv); |
| img_ir_setup(priv); |
| |
| return 0; |
| |
| err_irq: |
| img_ir_remove_hw(priv); |
| img_ir_remove_raw(priv); |
| err_probe: |
| if (!IS_ERR(priv->sys_clk)) |
| clk_disable_unprepare(priv->sys_clk); |
| return error; |
| } |
| |
| static int img_ir_remove(struct platform_device *pdev) |
| { |
| struct img_ir_priv *priv = platform_get_drvdata(pdev); |
| |
| free_irq(priv->irq, priv); |
| img_ir_remove_hw(priv); |
| img_ir_remove_raw(priv); |
| |
| if (!IS_ERR(priv->clk)) |
| clk_disable_unprepare(priv->clk); |
| if (!IS_ERR(priv->sys_clk)) |
| clk_disable_unprepare(priv->sys_clk); |
| return 0; |
| } |
| |
| static SIMPLE_DEV_PM_OPS(img_ir_pmops, img_ir_suspend, img_ir_resume); |
| |
| static const struct of_device_id img_ir_match[] = { |
| { .compatible = "img,ir-rev1" }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(of, img_ir_match); |
| |
| static struct platform_driver img_ir_driver = { |
| .driver = { |
| .name = "img-ir", |
| .of_match_table = img_ir_match, |
| .pm = &img_ir_pmops, |
| }, |
| .probe = img_ir_probe, |
| .remove = img_ir_remove, |
| }; |
| |
| module_platform_driver(img_ir_driver); |
| |
| MODULE_AUTHOR("Imagination Technologies Ltd."); |
| MODULE_DESCRIPTION("ImgTec IR"); |
| MODULE_LICENSE("GPL"); |