1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *  Copyright (C) 2014 STMicroelectronics – All Rights Reserved
  4 *
  5 *  Author: Lee Jones <lee.jones@linaro.org>
  6 *
  7 *  This is a re-write of Christophe Kerello's PMU driver.
  8 */
  9
 10#include <dt-bindings/interrupt-controller/irq-st.h>
 11#include <linux/err.h>
 12#include <linux/mfd/syscon.h>
 13#include <linux/of_device.h>
 14#include <linux/platform_device.h>
 15#include <linux/regmap.h>
 16#include <linux/slab.h>
 17
 18#define STIH415_SYSCFG_642		0x0a8
 19#define STIH416_SYSCFG_7543		0x87c
 20#define STIH407_SYSCFG_5102		0x198
 21#define STID127_SYSCFG_734		0x088
 22
 23#define ST_A9_IRQ_MASK			0x001FFFFF
 24#define ST_A9_IRQ_MAX_CHANS		2
 25
 26#define ST_A9_IRQ_EN_CTI_0		BIT(0)
 27#define ST_A9_IRQ_EN_CTI_1		BIT(1)
 28#define ST_A9_IRQ_EN_PMU_0		BIT(2)
 29#define ST_A9_IRQ_EN_PMU_1		BIT(3)
 30#define ST_A9_IRQ_EN_PL310_L2		BIT(4)
 31#define ST_A9_IRQ_EN_EXT_0		BIT(5)
 32#define ST_A9_IRQ_EN_EXT_1		BIT(6)
 33#define ST_A9_IRQ_EN_EXT_2		BIT(7)
 34
 35#define ST_A9_FIQ_N_SEL(dev, chan)	(dev << (8  + (chan * 3)))
 36#define ST_A9_IRQ_N_SEL(dev, chan)	(dev << (14 + (chan * 3)))
 37#define ST_A9_EXTIRQ_INV_SEL(dev)	(dev << 20)
 38
 39struct st_irq_syscfg {
 40	struct regmap *regmap;
 41	unsigned int syscfg;
 42	unsigned int config;
 43	bool ext_inverted;
 44};
 45
 46static const struct of_device_id st_irq_syscfg_match[] = {
 47	{
 48		.compatible = "st,stih415-irq-syscfg",
 49		.data = (void *)STIH415_SYSCFG_642,
 50	},
 51	{
 52		.compatible = "st,stih416-irq-syscfg",
 53		.data = (void *)STIH416_SYSCFG_7543,
 54	},
 55	{
 56		.compatible = "st,stih407-irq-syscfg",
 57		.data = (void *)STIH407_SYSCFG_5102,
 58	},
 59	{
 60		.compatible = "st,stid127-irq-syscfg",
 61		.data = (void *)STID127_SYSCFG_734,
 62	},
 63	{}
 64};
 65
 66static int st_irq_xlate(struct platform_device *pdev,
 67			int device, int channel, bool irq)
 68{
 69	struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
 70
 71	/* Set the device enable bit. */
 72	switch (device) {
 73	case ST_IRQ_SYSCFG_EXT_0:
 74		ddata->config |= ST_A9_IRQ_EN_EXT_0;
 75		break;
 76	case ST_IRQ_SYSCFG_EXT_1:
 77		ddata->config |= ST_A9_IRQ_EN_EXT_1;
 78		break;
 79	case ST_IRQ_SYSCFG_EXT_2:
 80		ddata->config |= ST_A9_IRQ_EN_EXT_2;
 81		break;
 82	case ST_IRQ_SYSCFG_CTI_0:
 83		ddata->config |= ST_A9_IRQ_EN_CTI_0;
 84		break;
 85	case ST_IRQ_SYSCFG_CTI_1:
 86		ddata->config |= ST_A9_IRQ_EN_CTI_1;
 87		break;
 88	case ST_IRQ_SYSCFG_PMU_0:
 89		ddata->config |= ST_A9_IRQ_EN_PMU_0;
 90		break;
 91	case ST_IRQ_SYSCFG_PMU_1:
 92		ddata->config |= ST_A9_IRQ_EN_PMU_1;
 93		break;
 94	case ST_IRQ_SYSCFG_pl310_L2:
 95		ddata->config |= ST_A9_IRQ_EN_PL310_L2;
 96		break;
 97	case ST_IRQ_SYSCFG_DISABLED:
 98		return 0;
 99	default:
100		dev_err(&pdev->dev, "Unrecognised device %d\n", device);
101		return -EINVAL;
102	}
103
104	/* Select IRQ/FIQ channel for device. */
105	ddata->config |= irq ?
106		ST_A9_IRQ_N_SEL(device, channel) :
107		ST_A9_FIQ_N_SEL(device, channel);
108
109	return 0;
110}
111
112static int st_irq_syscfg_enable(struct platform_device *pdev)
113{
114	struct device_node *np = pdev->dev.of_node;
115	struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
116	int channels, ret, i;
117	u32 device, invert;
118
119	channels = of_property_count_u32_elems(np, "st,irq-device");
120	if (channels != ST_A9_IRQ_MAX_CHANS) {
121		dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n");
122		return -EINVAL;
123	}
124
125	channels = of_property_count_u32_elems(np, "st,fiq-device");
126	if (channels != ST_A9_IRQ_MAX_CHANS) {
127		dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n");
128		return -EINVAL;
129	}
130
131	for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) {
132		of_property_read_u32_index(np, "st,irq-device", i, &device);
133
134		ret = st_irq_xlate(pdev, device, i, true);
135		if (ret)
136			return ret;
137
138		of_property_read_u32_index(np, "st,fiq-device", i, &device);
139
140		ret = st_irq_xlate(pdev, device, i, false);
141		if (ret)
142			return ret;
143	}
144
145	/* External IRQs may be inverted. */
146	of_property_read_u32(np, "st,invert-ext", &invert);
147	ddata->config |= ST_A9_EXTIRQ_INV_SEL(invert);
148
149	return regmap_update_bits(ddata->regmap, ddata->syscfg,
150				  ST_A9_IRQ_MASK, ddata->config);
151}
152
153static int st_irq_syscfg_probe(struct platform_device *pdev)
154{
155	struct device_node *np = pdev->dev.of_node;
156	const struct of_device_id *match;
157	struct st_irq_syscfg *ddata;
158
159	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
160	if (!ddata)
161		return -ENOMEM;
162
163	match = of_match_device(st_irq_syscfg_match, &pdev->dev);
164	if (!match)
165		return -ENODEV;
166
167	ddata->syscfg = (unsigned int)match->data;
168
169	ddata->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
170	if (IS_ERR(ddata->regmap)) {
171		dev_err(&pdev->dev, "syscfg phandle missing\n");
172		return PTR_ERR(ddata->regmap);
173	}
174
175	dev_set_drvdata(&pdev->dev, ddata);
176
177	return st_irq_syscfg_enable(pdev);
178}
179
180static int __maybe_unused st_irq_syscfg_resume(struct device *dev)
181{
182	struct st_irq_syscfg *ddata = dev_get_drvdata(dev);
183
184	return regmap_update_bits(ddata->regmap, ddata->syscfg,
185				  ST_A9_IRQ_MASK, ddata->config);
186}
187
188static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume);
189
190static struct platform_driver st_irq_syscfg_driver = {
191	.driver = {
192		.name = "st_irq_syscfg",
193		.pm = &st_irq_syscfg_pm_ops,
194		.of_match_table = st_irq_syscfg_match,
195	},
196	.probe = st_irq_syscfg_probe,
197};
198
199static int __init st_irq_syscfg_init(void)
200{
201	return platform_driver_register(&st_irq_syscfg_driver);
202}
203core_initcall(st_irq_syscfg_init);