diff options
Diffstat (limited to 'drivers/irqchip/irq-st.c')
| -rw-r--r-- | drivers/irqchip/irq-st.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-st.c b/drivers/irqchip/irq-st.c new file mode 100644 index 000000000000..9af48a85c16f --- /dev/null +++ b/drivers/irqchip/irq-st.c @@ -0,0 +1,206 @@ +/* + * Copyright (C) 2014 STMicroelectronics – All Rights Reserved + * + * Author: Lee Jones <lee.jones@linaro.org> + * + * This is a re-write of Christophe Kerello's PMU driver. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <dt-bindings/interrupt-controller/irq-st.h> +#include <linux/err.h> +#include <linux/mfd/syscon.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/slab.h> + +#define STIH415_SYSCFG_642 0x0a8 +#define STIH416_SYSCFG_7543 0x87c +#define STIH407_SYSCFG_5102 0x198 +#define STID127_SYSCFG_734 0x088 + +#define ST_A9_IRQ_MASK 0x001FFFFF +#define ST_A9_IRQ_MAX_CHANS 2 + +#define ST_A9_IRQ_EN_CTI_0 BIT(0) +#define ST_A9_IRQ_EN_CTI_1 BIT(1) +#define ST_A9_IRQ_EN_PMU_0 BIT(2) +#define ST_A9_IRQ_EN_PMU_1 BIT(3) +#define ST_A9_IRQ_EN_PL310_L2 BIT(4) +#define ST_A9_IRQ_EN_EXT_0 BIT(5) +#define ST_A9_IRQ_EN_EXT_1 BIT(6) +#define ST_A9_IRQ_EN_EXT_2 BIT(7) + +#define ST_A9_FIQ_N_SEL(dev, chan) (dev << (8 + (chan * 3))) +#define ST_A9_IRQ_N_SEL(dev, chan) (dev << (14 + (chan * 3))) +#define ST_A9_EXTIRQ_INV_SEL(dev) (dev << 20) + +struct st_irq_syscfg { + struct regmap *regmap; + unsigned int syscfg; + unsigned int config; + bool ext_inverted; +}; + +static const struct of_device_id st_irq_syscfg_match[] = { + { + .compatible = "st,stih415-irq-syscfg", + .data = (void *)STIH415_SYSCFG_642, + }, + { + .compatible = "st,stih416-irq-syscfg", + .data = (void *)STIH416_SYSCFG_7543, + }, + { + .compatible = "st,stih407-irq-syscfg", + .data = (void *)STIH407_SYSCFG_5102, + }, + { + .compatible = "st,stid127-irq-syscfg", + .data = (void *)STID127_SYSCFG_734, + }, + {} +}; + +static int st_irq_xlate(struct platform_device *pdev, + int device, int channel, bool irq) +{ + struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev); + + /* Set the device enable bit. */ + switch (device) { + case ST_IRQ_SYSCFG_EXT_0: + ddata->config |= ST_A9_IRQ_EN_EXT_0; + break; + case ST_IRQ_SYSCFG_EXT_1: + ddata->config |= ST_A9_IRQ_EN_EXT_1; + break; + case ST_IRQ_SYSCFG_EXT_2: + ddata->config |= ST_A9_IRQ_EN_EXT_2; + break; + case ST_IRQ_SYSCFG_CTI_0: + ddata->config |= ST_A9_IRQ_EN_CTI_0; + break; + case ST_IRQ_SYSCFG_CTI_1: + ddata->config |= ST_A9_IRQ_EN_CTI_1; + break; + case ST_IRQ_SYSCFG_PMU_0: + ddata->config |= ST_A9_IRQ_EN_PMU_0; + break; + case ST_IRQ_SYSCFG_PMU_1: + ddata->config |= ST_A9_IRQ_EN_PMU_1; + break; + case ST_IRQ_SYSCFG_pl310_L2: + ddata->config |= ST_A9_IRQ_EN_PL310_L2; + break; + case ST_IRQ_SYSCFG_DISABLED: + return 0; + default: + dev_err(&pdev->dev, "Unrecognised device %d\n", device); + return -EINVAL; + } + + /* Select IRQ/FIQ channel for device. */ + ddata->config |= irq ? + ST_A9_IRQ_N_SEL(device, channel) : + ST_A9_FIQ_N_SEL(device, channel); + + return 0; +} + +static int st_irq_syscfg_enable(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev); + int channels, ret, i; + u32 device, invert; + + channels = of_property_count_u32_elems(np, "st,irq-device"); + if (channels != ST_A9_IRQ_MAX_CHANS) { + dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n"); + return -EINVAL; + } + + channels = of_property_count_u32_elems(np, "st,fiq-device"); + if (channels != ST_A9_IRQ_MAX_CHANS) { + dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n"); + return -EINVAL; + } + + for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) { + of_property_read_u32_index(np, "st,irq-device", i, &device); + + ret = st_irq_xlate(pdev, device, i, true); + if (ret) + return ret; + + of_property_read_u32_index(np, "st,fiq-device", i, &device); + + ret = st_irq_xlate(pdev, device, i, false); + if (ret) + return ret; + } + + /* External IRQs may be inverted. */ + of_property_read_u32(np, "st,invert-ext", &invert); + ddata->config |= ST_A9_EXTIRQ_INV_SEL(invert); + + return regmap_update_bits(ddata->regmap, ddata->syscfg, + ST_A9_IRQ_MASK, ddata->config); +} + +static int st_irq_syscfg_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + const struct of_device_id *match; + struct st_irq_syscfg *ddata; + + ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + match = of_match_device(st_irq_syscfg_match, &pdev->dev); + if (!match) + return -ENODEV; + + ddata->syscfg = (unsigned int)match->data; + + ddata->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); + if (IS_ERR(ddata->regmap)) { + dev_err(&pdev->dev, "syscfg phandle missing\n"); + return PTR_ERR(ddata->regmap); + } + + dev_set_drvdata(&pdev->dev, ddata); + + return st_irq_syscfg_enable(pdev); +} + +static int st_irq_syscfg_resume(struct device *dev) +{ + struct st_irq_syscfg *ddata = dev_get_drvdata(dev); + + return regmap_update_bits(ddata->regmap, ddata->syscfg, + ST_A9_IRQ_MASK, ddata->config); +} + +static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume); + +static struct platform_driver st_irq_syscfg_driver = { + .driver = { + .name = "st_irq_syscfg", + .pm = &st_irq_syscfg_pm_ops, + .of_match_table = st_irq_syscfg_match, + }, + .probe = st_irq_syscfg_probe, +}; + +static int __init st_irq_syscfg_init(void) +{ + return platform_driver_register(&st_irq_syscfg_driver); +} +core_initcall(st_irq_syscfg_init); |