diff options
Diffstat (limited to 'drivers/media/rc/img-ir/img-ir-core.c')
| -rw-r--r-- | drivers/media/rc/img-ir/img-ir-core.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/drivers/media/rc/img-ir/img-ir-core.c b/drivers/media/rc/img-ir/img-ir-core.c new file mode 100644 index 000000000..bcbabeeab --- /dev/null +++ b/drivers/media/rc/img-ir/img-ir-core.c @@ -0,0 +1,200 @@ +/* + * 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"); |