300 lines
7.4 KiB
C
Executable File
300 lines
7.4 KiB
C
Executable File
/* sound/soc/samsung/abox/abox_gic.c
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*
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* ALSA SoC Audio Layer - Samsung ABOX GIC driver
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*
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* Copyright (c) 2016 Samsung Electronics Co. Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* #define DEBUG */
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/smc.h>
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#include <linux/irqchip/arm-gic.h>
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#include <linux/delay.h>
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#include "abox_util.h"
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#include "abox_gic.h"
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#define GIC_IS_SECURE_FREE
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void abox_gic_generate_interrupt(struct device *dev, unsigned int irq)
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{
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#ifdef GIC_IS_SECURE_FREE
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struct abox_gic_data *data = dev_get_drvdata(dev);
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#endif
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dev_dbg(dev, "%s(%d)\n", __func__, irq);
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#ifdef GIC_IS_SECURE_FREE
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writel((0x1 << 16) | (irq & 0xF),
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data->gicd_base + GIC_DIST_SOFTINT);
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#else
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dev_dbg(dev, "exynos_smc() is called\n");
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exynos_smc(SMC_CMD_REG,
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SMC_REG_ID_SFR_W(0x13EF1000 + GIC_DIST_SOFTINT),
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(0x1 << 16) | (hw_irq & 0xF), 0);
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#endif
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}
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EXPORT_SYMBOL(abox_gic_generate_interrupt);
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int abox_gic_register_irq_handler(struct device *dev, unsigned int irq,
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irq_handler_t handler, void *dev_id)
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{
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struct abox_gic_data *data = dev_get_drvdata(dev);
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dev_info(dev, "%s(%u, %pf)\n", __func__, irq, handler);
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if (irq >= ARRAY_SIZE(data->handler)) {
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dev_err(dev, "invalid irq: %d\n", irq);
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return -EINVAL;
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}
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data->handler[irq].handler = handler;
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data->handler[irq].dev_id = dev_id;
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return 0;
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}
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EXPORT_SYMBOL(abox_gic_register_irq_handler);
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int abox_gic_unregister_irq_handler(struct device *dev, unsigned int irq)
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{
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struct abox_gic_data *data = dev_get_drvdata(dev);
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dev_info(dev, "%s(%u)\n", __func__, irq);
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if (irq >= ARRAY_SIZE(data->handler)) {
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dev_err(dev, "invalid irq: %d\n", irq);
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return -EINVAL;
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}
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data->handler[irq].handler = NULL;
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data->handler[irq].dev_id = NULL;
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return 0;
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}
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EXPORT_SYMBOL(abox_gic_unregister_irq_handler);
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static irqreturn_t __abox_gic_irq_handler(struct abox_gic_data *data, u32 irqnr)
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{
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struct abox_gic_irq_handler_t *handler;
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if (irqnr >= ARRAY_SIZE(data->handler))
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return IRQ_NONE;
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handler = &data->handler[irqnr];
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if (!handler->handler)
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return IRQ_NONE;
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return handler->handler(irqnr, handler->dev_id);
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}
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static irqreturn_t abox_gic_irq_handler(int irq, void *dev_id)
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{
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struct device *dev = dev_id;
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struct abox_gic_data *data = dev_get_drvdata(dev);
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irqreturn_t ret = IRQ_NONE;
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u32 irqstat, irqnr;
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dev_dbg(dev, "%s\n", __func__);
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do {
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irqstat = readl(data->gicc_base + GIC_CPU_INTACK);
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irqnr = irqstat & GICC_IAR_INT_ID_MASK;
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dev_dbg(dev, "IAR: %08X\n", irqstat);
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if (likely(irqnr < 16)) {
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writel(irqstat, data->gicc_base + GIC_CPU_EOI);
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writel(irqstat, data->gicc_base + GIC_CPU_DEACTIVATE);
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ret |= __abox_gic_irq_handler(data, irqnr);
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continue;
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} else if (unlikely(irqnr > 15 && irqnr < 1021)) {
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writel(irqstat, data->gicc_base + GIC_CPU_EOI);
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ret |= __abox_gic_irq_handler(data, irqnr);
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continue;
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}
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break;
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} while (1);
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return ret;
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}
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static void abox_gicd_enable(struct device *dev, bool en)
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{
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struct abox_gic_data *data = dev_get_drvdata(dev);
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void __iomem *gicd_base = data->gicd_base;
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if (en) {
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writel(0x1, gicd_base + GIC_DIST_CTRL);
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writel(0x0, gicd_base + GIC_DIST_IGROUP + 0x0);
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writel(0x0, gicd_base + GIC_DIST_IGROUP + 0x4);
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writel(0x0, gicd_base + GIC_DIST_IGROUP + 0x8);
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writel(0x0, gicd_base + GIC_DIST_IGROUP + 0xC);
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/* Todo: check whether it is really needed
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* writel(0xc, gicd_base + GIC_DIST_ENABLE_SET + 0x4);
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*/
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dev_dbg(dev, "[WRITE]GICD_ISENABLE:en : 0x%x\n",
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readl(gicd_base + GIC_DIST_ENABLE_SET + 0x4));
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} else {
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writel(0x0, gicd_base + GIC_DIST_CTRL);
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/* Todo: check whether it is really needed
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* writel(0xc, gicd_base + GIC_DIST_ENABLE_CLEAR + 0x4);
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*/
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dev_dbg(dev, "[WRITE]GICD_ISENABLE:dis : 0x%x\n",
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readl(gicd_base + GIC_DIST_ENABLE_SET + 0x4));
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}
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}
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void abox_gic_init_gic(struct device *dev)
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{
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struct abox_gic_data *data = dev_get_drvdata(dev);
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unsigned long arg;
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int i, ret;
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dev_info(dev, "%s\n", __func__);
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#ifdef GIC_IS_SECURE_FREE
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writel(0x000000FF, data->gicc_base + GIC_CPU_PRIMASK);
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writel(0x3, data->gicd_base + GIC_DIST_CTRL);
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#else
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arg = SMC_REG_ID_SFR_W(data->gicc_base_phys + GIC_CPU_PRIMASK);
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ret = exynos_smc(SMC_CMD_REG, arg, 0x000000FF, 0);
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arg = SMC_REG_ID_SFR_W(data->gicd_base_phys + GIC_DIST_CTRL);
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ret = exynos_smc(SMC_CMD_REG, arg, 0x3, 0);
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#endif
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if (is_secure_gic()) {
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for (i = 0; i < 1; i++) {
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arg = SMC_REG_ID_SFR_W(data->gicd_base_phys +
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GIC_DIST_IGROUP + (i * 4));
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ret = exynos_smc(SMC_CMD_REG, arg, 0xFFFFFFFF, 0);
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}
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}
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for (i = 0; i < 40; i++) {
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#ifdef GIC_IS_SECURE_FREE
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writel(0x10101010, data->gicd_base + GIC_DIST_PRI + (i * 4));
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#else
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arg = SMC_REG_ID_SFR_W(data->gicd_base_phys +
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GIC_DIST_PRI + (i * 4));
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ret = exynos_smc(SMC_CMD_REG, arg, 0x10101010, 0);
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#endif
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}
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writel(0x3, data->gicc_base + GIC_CPU_CTRL);
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}
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EXPORT_SYMBOL(abox_gic_init_gic);
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int abox_gic_enable_irq(struct device *dev)
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{
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struct abox_gic_data *data = dev_get_drvdata(dev);
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if (likely(data->disabled)) {
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dev_info(dev, "%s\n", __func__);
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data->disabled = false;
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enable_irq(data->irq);
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abox_gicd_enable(dev, true);
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}
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return 0;
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}
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int abox_gic_disable_irq(struct device *dev)
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{
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struct abox_gic_data *data = dev_get_drvdata(dev);
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if (likely(!data->disabled)) {
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dev_info(dev, "%s\n", __func__);
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data->disabled = true;
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disable_irq(data->irq);
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}
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return 0;
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}
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static int samsung_abox_gic_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct abox_gic_data *data;
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int ret;
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dev_info(dev, "%s\n", __func__);
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data = devm_kzalloc(dev, sizeof(struct abox_gic_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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platform_set_drvdata(pdev, data);
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data->gicd_base = devm_request_and_map_byname(pdev, "gicd",
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&data->gicd_base_phys, NULL);
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if (IS_ERR(data->gicd_base))
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return PTR_ERR(data->gicd_base);
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data->gicc_base = devm_request_and_map_byname(pdev, "gicc",
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&data->gicc_base_phys, NULL);
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if (IS_ERR(data->gicc_base))
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return PTR_ERR(data->gicc_base);
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data->irq = platform_get_irq(pdev, 0);
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if (data->irq < 0) {
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dev_err(dev, "Failed to get irq\n");
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return data->irq;
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}
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ret = devm_request_irq(dev, data->irq, abox_gic_irq_handler,
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IRQF_TRIGGER_RISING, pdev->name, dev);
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if (ret < 0) {
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dev_err(dev, "Failed to request irq\n");
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return ret;
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}
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ret = enable_irq_wake(data->irq);
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if (ret < 0)
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dev_err(dev, "Failed to enable irq wake\n");
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#ifndef CONFIG_PM
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abox_gic_resume(dev);
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#endif
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dev_info(dev, "%s: probe complete\n", __func__);
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return 0;
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}
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static int samsung_abox_gic_remove(struct platform_device *pdev)
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{
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dev_info(&pdev->dev, "%s\n", __func__);
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return 0;
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}
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static const struct of_device_id samsung_abox_gic_of_match[] = {
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{
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.compatible = "samsung,abox_gic",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, samsung_abox_gic_of_match);
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static struct platform_driver samsung_abox_gic_driver = {
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.probe = samsung_abox_gic_probe,
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.remove = samsung_abox_gic_remove,
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.driver = {
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.name = "samsung-abox-gic",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(samsung_abox_gic_of_match),
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},
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};
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module_platform_driver(samsung_abox_gic_driver);
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/* Module information */
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MODULE_AUTHOR("Gyeongtaek Lee, <gt82.lee@samsung.com>");
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MODULE_DESCRIPTION("Samsung ASoC A-Box GIC Driver");
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MODULE_ALIAS("platform:samsung-abox-gic");
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MODULE_LICENSE("GPL");
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