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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 | // SPDX-License-Identifier: GPL-2.0-or-later /* * ImgTec IR Decoder found in PowerDown Controller. * * Copyright 2010-2014 Imagination Technologies Ltd. * * 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; int irq, error, error2; /* Get resources from platform device */ irq = platform_get_irq(pdev, 0); if (irq < 0) 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 */ priv->reg_base = devm_platform_ioremap_resource(pdev, 0); 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 void 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); } 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_new = img_ir_remove, }; module_platform_driver(img_ir_driver); MODULE_AUTHOR("Imagination Technologies Ltd."); MODULE_DESCRIPTION("ImgTec IR"); MODULE_LICENSE("GPL"); |