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203 lines
5.1 KiB
203 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2014 STMicroelectronics – All Rights Reserved |
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* |
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* Author: Lee Jones <[email protected]> |
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* |
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* This is a re-write of Christophe Kerello's PMU driver. |
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*/ |
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#include <dt-bindings/interrupt-controller/irq-st.h> |
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#include <linux/err.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/slab.h> |
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#define STIH415_SYSCFG_642 0x0a8 |
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#define STIH416_SYSCFG_7543 0x87c |
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#define STIH407_SYSCFG_5102 0x198 |
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#define STID127_SYSCFG_734 0x088 |
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#define ST_A9_IRQ_MASK 0x001FFFFF |
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#define ST_A9_IRQ_MAX_CHANS 2 |
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#define ST_A9_IRQ_EN_CTI_0 BIT(0) |
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#define ST_A9_IRQ_EN_CTI_1 BIT(1) |
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#define ST_A9_IRQ_EN_PMU_0 BIT(2) |
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#define ST_A9_IRQ_EN_PMU_1 BIT(3) |
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#define ST_A9_IRQ_EN_PL310_L2 BIT(4) |
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#define ST_A9_IRQ_EN_EXT_0 BIT(5) |
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#define ST_A9_IRQ_EN_EXT_1 BIT(6) |
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#define ST_A9_IRQ_EN_EXT_2 BIT(7) |
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#define ST_A9_FIQ_N_SEL(dev, chan) (dev << (8 + (chan * 3))) |
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#define ST_A9_IRQ_N_SEL(dev, chan) (dev << (14 + (chan * 3))) |
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#define ST_A9_EXTIRQ_INV_SEL(dev) (dev << 20) |
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struct st_irq_syscfg { |
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struct regmap *regmap; |
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unsigned int syscfg; |
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unsigned int config; |
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bool ext_inverted; |
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}; |
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static const struct of_device_id st_irq_syscfg_match[] = { |
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{ |
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.compatible = "st,stih415-irq-syscfg", |
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.data = (void *)STIH415_SYSCFG_642, |
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}, |
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{ |
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.compatible = "st,stih416-irq-syscfg", |
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.data = (void *)STIH416_SYSCFG_7543, |
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}, |
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{ |
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.compatible = "st,stih407-irq-syscfg", |
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.data = (void *)STIH407_SYSCFG_5102, |
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}, |
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{ |
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.compatible = "st,stid127-irq-syscfg", |
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.data = (void *)STID127_SYSCFG_734, |
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}, |
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{} |
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}; |
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static int st_irq_xlate(struct platform_device *pdev, |
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int device, int channel, bool irq) |
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{ |
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struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev); |
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/* Set the device enable bit. */ |
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switch (device) { |
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case ST_IRQ_SYSCFG_EXT_0: |
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ddata->config |= ST_A9_IRQ_EN_EXT_0; |
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break; |
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case ST_IRQ_SYSCFG_EXT_1: |
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ddata->config |= ST_A9_IRQ_EN_EXT_1; |
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break; |
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case ST_IRQ_SYSCFG_EXT_2: |
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ddata->config |= ST_A9_IRQ_EN_EXT_2; |
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break; |
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case ST_IRQ_SYSCFG_CTI_0: |
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ddata->config |= ST_A9_IRQ_EN_CTI_0; |
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break; |
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case ST_IRQ_SYSCFG_CTI_1: |
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ddata->config |= ST_A9_IRQ_EN_CTI_1; |
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break; |
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case ST_IRQ_SYSCFG_PMU_0: |
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ddata->config |= ST_A9_IRQ_EN_PMU_0; |
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break; |
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case ST_IRQ_SYSCFG_PMU_1: |
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ddata->config |= ST_A9_IRQ_EN_PMU_1; |
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break; |
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case ST_IRQ_SYSCFG_pl310_L2: |
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ddata->config |= ST_A9_IRQ_EN_PL310_L2; |
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break; |
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case ST_IRQ_SYSCFG_DISABLED: |
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return 0; |
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default: |
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dev_err(&pdev->dev, "Unrecognised device %d\n", device); |
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return -EINVAL; |
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} |
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/* Select IRQ/FIQ channel for device. */ |
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ddata->config |= irq ? |
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ST_A9_IRQ_N_SEL(device, channel) : |
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ST_A9_FIQ_N_SEL(device, channel); |
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return 0; |
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} |
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static int st_irq_syscfg_enable(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev); |
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int channels, ret, i; |
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u32 device, invert; |
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channels = of_property_count_u32_elems(np, "st,irq-device"); |
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if (channels != ST_A9_IRQ_MAX_CHANS) { |
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dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n"); |
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return -EINVAL; |
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} |
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channels = of_property_count_u32_elems(np, "st,fiq-device"); |
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if (channels != ST_A9_IRQ_MAX_CHANS) { |
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dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n"); |
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return -EINVAL; |
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} |
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for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) { |
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of_property_read_u32_index(np, "st,irq-device", i, &device); |
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ret = st_irq_xlate(pdev, device, i, true); |
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if (ret) |
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return ret; |
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of_property_read_u32_index(np, "st,fiq-device", i, &device); |
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ret = st_irq_xlate(pdev, device, i, false); |
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if (ret) |
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return ret; |
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} |
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/* External IRQs may be inverted. */ |
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of_property_read_u32(np, "st,invert-ext", &invert); |
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ddata->config |= ST_A9_EXTIRQ_INV_SEL(invert); |
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return regmap_update_bits(ddata->regmap, ddata->syscfg, |
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ST_A9_IRQ_MASK, ddata->config); |
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} |
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static int st_irq_syscfg_probe(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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const struct of_device_id *match; |
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struct st_irq_syscfg *ddata; |
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ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); |
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if (!ddata) |
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return -ENOMEM; |
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match = of_match_device(st_irq_syscfg_match, &pdev->dev); |
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if (!match) |
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return -ENODEV; |
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ddata->syscfg = (unsigned int)match->data; |
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ddata->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); |
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if (IS_ERR(ddata->regmap)) { |
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dev_err(&pdev->dev, "syscfg phandle missing\n"); |
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return PTR_ERR(ddata->regmap); |
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} |
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dev_set_drvdata(&pdev->dev, ddata); |
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return st_irq_syscfg_enable(pdev); |
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} |
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static int __maybe_unused st_irq_syscfg_resume(struct device *dev) |
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{ |
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struct st_irq_syscfg *ddata = dev_get_drvdata(dev); |
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return regmap_update_bits(ddata->regmap, ddata->syscfg, |
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ST_A9_IRQ_MASK, ddata->config); |
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} |
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static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume); |
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static struct platform_driver st_irq_syscfg_driver = { |
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.driver = { |
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.name = "st_irq_syscfg", |
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.pm = &st_irq_syscfg_pm_ops, |
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.of_match_table = st_irq_syscfg_match, |
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}, |
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.probe = st_irq_syscfg_probe, |
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}; |
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static int __init st_irq_syscfg_init(void) |
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{ |
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return platform_driver_register(&st_irq_syscfg_driver); |
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} |
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core_initcall(st_irq_syscfg_init);
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