1 /* 2 * ImgTec IR Decoder found in PowerDown Controller. 3 * 4 * Copyright 2010-2014 Imagination Technologies Ltd. 5 * 6 * This contains core img-ir code for setting up the driver. The two interfaces 7 * (raw and hardware decode) are handled separately. 8 */ 9 10 #include <linux/clk.h> 11 #include <linux/init.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/slab.h> 17 #include <linux/spinlock.h> 18 #include "img-ir.h" 19 20 static irqreturn_t img_ir_isr(int irq, void *dev_id) 21 { 22 struct img_ir_priv *priv = dev_id; 23 u32 irq_status; 24 25 spin_lock(&priv->lock); 26 /* we have to clear irqs before reading */ 27 irq_status = img_ir_read(priv, IMG_IR_IRQ_STATUS); 28 img_ir_write(priv, IMG_IR_IRQ_CLEAR, irq_status); 29 30 /* don't handle valid data irqs if we're only interested in matches */ 31 irq_status &= img_ir_read(priv, IMG_IR_IRQ_ENABLE); 32 33 /* hand off edge interrupts to raw decode handler */ 34 if (irq_status & IMG_IR_IRQ_EDGE && img_ir_raw_enabled(&priv->raw)) 35 img_ir_isr_raw(priv, irq_status); 36 37 /* hand off hardware match interrupts to hardware decode handler */ 38 if (irq_status & (IMG_IR_IRQ_DATA_MATCH | 39 IMG_IR_IRQ_DATA_VALID | 40 IMG_IR_IRQ_DATA2_VALID) && 41 img_ir_hw_enabled(&priv->hw)) 42 img_ir_isr_hw(priv, irq_status); 43 44 spin_unlock(&priv->lock); 45 return IRQ_HANDLED; 46 } 47 48 static void img_ir_setup(struct img_ir_priv *priv) 49 { 50 /* start off with interrupts disabled */ 51 img_ir_write(priv, IMG_IR_IRQ_ENABLE, 0); 52 53 img_ir_setup_raw(priv); 54 img_ir_setup_hw(priv); 55 56 if (!IS_ERR(priv->clk)) 57 clk_prepare_enable(priv->clk); 58 } 59 60 static void img_ir_ident(struct img_ir_priv *priv) 61 { 62 u32 core_rev = img_ir_read(priv, IMG_IR_CORE_REV); 63 64 dev_info(priv->dev, 65 "IMG IR Decoder (%d.%d.%d.%d) probed successfully\n", 66 (core_rev & IMG_IR_DESIGNER) >> IMG_IR_DESIGNER_SHIFT, 67 (core_rev & IMG_IR_MAJOR_REV) >> IMG_IR_MAJOR_REV_SHIFT, 68 (core_rev & IMG_IR_MINOR_REV) >> IMG_IR_MINOR_REV_SHIFT, 69 (core_rev & IMG_IR_MAINT_REV) >> IMG_IR_MAINT_REV_SHIFT); 70 dev_info(priv->dev, "Modes:%s%s\n", 71 img_ir_hw_enabled(&priv->hw) ? " hardware" : "", 72 img_ir_raw_enabled(&priv->raw) ? " raw" : ""); 73 } 74 75 static int img_ir_probe(struct platform_device *pdev) 76 { 77 struct img_ir_priv *priv; 78 struct resource *res_regs; 79 int irq, error, error2; 80 81 /* Get resources from platform device */ 82 irq = platform_get_irq(pdev, 0); 83 if (irq < 0) { 84 dev_err(&pdev->dev, "cannot find IRQ resource\n"); 85 return irq; 86 } 87 88 /* Private driver data */ 89 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 90 if (!priv) { 91 dev_err(&pdev->dev, "cannot allocate device data\n"); 92 return -ENOMEM; 93 } 94 platform_set_drvdata(pdev, priv); 95 priv->dev = &pdev->dev; 96 spin_lock_init(&priv->lock); 97 98 /* Ioremap the registers */ 99 res_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 100 priv->reg_base = devm_ioremap_resource(&pdev->dev, res_regs); 101 if (IS_ERR(priv->reg_base)) 102 return PTR_ERR(priv->reg_base); 103 104 /* Get core clock */ 105 priv->clk = devm_clk_get(&pdev->dev, "core"); 106 if (IS_ERR(priv->clk)) 107 dev_warn(&pdev->dev, "cannot get core clock resource\n"); 108 /* 109 * The driver doesn't need to know about the system ("sys") or power 110 * modulation ("mod") clocks yet 111 */ 112 113 /* Set up raw & hw decoder */ 114 error = img_ir_probe_raw(priv); 115 error2 = img_ir_probe_hw(priv); 116 if (error && error2) 117 return (error == -ENODEV) ? error2 : error; 118 119 /* Get the IRQ */ 120 priv->irq = irq; 121 error = request_irq(priv->irq, img_ir_isr, 0, "img-ir", priv); 122 if (error) { 123 dev_err(&pdev->dev, "cannot register IRQ %u\n", 124 priv->irq); 125 error = -EIO; 126 goto err_irq; 127 } 128 129 img_ir_ident(priv); 130 img_ir_setup(priv); 131 132 return 0; 133 134 err_irq: 135 img_ir_remove_hw(priv); 136 img_ir_remove_raw(priv); 137 return error; 138 } 139 140 static int img_ir_remove(struct platform_device *pdev) 141 { 142 struct img_ir_priv *priv = platform_get_drvdata(pdev); 143 144 free_irq(priv->irq, img_ir_isr); 145 img_ir_remove_hw(priv); 146 img_ir_remove_raw(priv); 147 148 if (!IS_ERR(priv->clk)) 149 clk_disable_unprepare(priv->clk); 150 return 0; 151 } 152 153 static SIMPLE_DEV_PM_OPS(img_ir_pmops, img_ir_suspend, img_ir_resume); 154 155 static const struct of_device_id img_ir_match[] = { 156 { .compatible = "img,ir-rev1" }, 157 {} 158 }; 159 MODULE_DEVICE_TABLE(of, img_ir_match); 160 161 static struct platform_driver img_ir_driver = { 162 .driver = { 163 .name = "img-ir", 164 .owner = THIS_MODULE, 165 .of_match_table = img_ir_match, 166 .pm = &img_ir_pmops, 167 }, 168 .probe = img_ir_probe, 169 .remove = img_ir_remove, 170 }; 171 172 module_platform_driver(img_ir_driver); 173 174 MODULE_AUTHOR("Imagination Technologies Ltd."); 175 MODULE_DESCRIPTION("ImgTec IR"); 176 MODULE_LICENSE("GPL"); 177