1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Driver for BCM63xx GPIO unit (pinctrl + GPIO)
4 *
5 * Copyright (C) 2021 ��lvaro Fern��ndez Rojas <noltari@gmail.com>
6 * Copyright (C) 2016 Jonas Gorski <jonas.gorski@gmail.com>
7 */
8
9#include <linux/gpio/regmap.h>
10#include <linux/mfd/syscon.h>
11#include <linux/mod_devicetable.h>
12#include <linux/of.h>
13#include <linux/platform_device.h>
14
15#include "pinctrl-bcm63xx.h"
16
17#define BCM63XX_BANK_SIZE	4
18
19#define BCM63XX_DIROUT_REG	0x04
20#define BCM63XX_DATA_REG	0x0c
21
22static int bcm63xx_reg_mask_xlate(struct gpio_regmap *gpio,
23				  unsigned int base, unsigned int offset,
24				  unsigned int *reg, unsigned int *mask)
25{
26	unsigned int line = offset % BCM63XX_BANK_GPIOS;
27	unsigned int stride = offset / BCM63XX_BANK_GPIOS;
28
29	*reg = base - stride * BCM63XX_BANK_SIZE;
30	*mask = BIT(line);
31
32	return 0;
33}
34
35static const struct of_device_id bcm63xx_gpio_of_match[] = {
36	{ .compatible = "brcm,bcm6318-gpio", },
37	{ .compatible = "brcm,bcm6328-gpio", },
38	{ .compatible = "brcm,bcm6358-gpio", },
39	{ .compatible = "brcm,bcm6362-gpio", },
40	{ .compatible = "brcm,bcm6368-gpio", },
41	{ .compatible = "brcm,bcm63268-gpio", },
42	{ /* sentinel */ }
43};
44
45static int bcm63xx_gpio_probe(struct device *dev, struct device_node *node,
46			      const struct bcm63xx_pinctrl_soc *soc,
47			      struct bcm63xx_pinctrl *pc)
48{
49	struct gpio_regmap_config grc = {0};
50
51	grc.parent = dev;
52	grc.fwnode = &node->fwnode;
53	grc.ngpio = soc->ngpios;
54	grc.ngpio_per_reg = BCM63XX_BANK_GPIOS;
55	grc.regmap = pc->regs;
56	grc.reg_dat_base = BCM63XX_DATA_REG;
57	grc.reg_dir_out_base = BCM63XX_DIROUT_REG;
58	grc.reg_set_base = BCM63XX_DATA_REG;
59	grc.reg_mask_xlate = bcm63xx_reg_mask_xlate;
60
61	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &grc));
62}
63
64int bcm63xx_pinctrl_probe(struct platform_device *pdev,
65			  const struct bcm63xx_pinctrl_soc *soc,
66			  void *driver_data)
67{
68	struct device *dev = &pdev->dev;
69	struct bcm63xx_pinctrl *pc;
70	struct device_node *node;
71	int err;
72
73	pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
74	if (!pc)
75		return -ENOMEM;
76
77	platform_set_drvdata(pdev, pc);
78
79	pc->dev = dev;
80	pc->driver_data = driver_data;
81
82	pc->regs = syscon_node_to_regmap(dev->parent->of_node);
83	if (IS_ERR(pc->regs))
84		return PTR_ERR(pc->regs);
85
86	pc->pctl_desc.name = dev_name(dev);
87	pc->pctl_desc.pins = soc->pins;
88	pc->pctl_desc.npins = soc->npins;
89	pc->pctl_desc.pctlops = soc->pctl_ops;
90	pc->pctl_desc.pmxops = soc->pmx_ops;
91	pc->pctl_desc.owner = THIS_MODULE;
92
93	pc->pctl_dev = devm_pinctrl_register(dev, &pc->pctl_desc, pc);
94	if (IS_ERR(pc->pctl_dev))
95		return PTR_ERR(pc->pctl_dev);
96
97	for_each_child_of_node(dev->parent->of_node, node) {
98		if (of_match_node(bcm63xx_gpio_of_match, node)) {
99			err = bcm63xx_gpio_probe(dev, node, soc, pc);
100			if (err) {
101				dev_err(dev, "could not add GPIO chip\n");
102				of_node_put(node);
103				return err;
104			}
105		}
106	}
107
108	return 0;
109}
110