Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * System Control Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2012 Freescale Semiconductor, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (C) 2012 Linaro Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Author: Dong Aisheng <dong.aisheng@linaro.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/hwspinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/of_address.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/platform_data/syscon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/mfd/syscon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static struct platform_driver syscon_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) static DEFINE_SPINLOCK(syscon_list_slock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static LIST_HEAD(syscon_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) struct syscon {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	struct device_node *np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) static const struct regmap_config syscon_regmap_config = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	.reg_bits = 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	.val_bits = 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	.reg_stride = 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	struct syscon *syscon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	u32 reg_io_width;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	struct regmap_config syscon_config = syscon_regmap_config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	struct resource res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	syscon = kzalloc(sizeof(*syscon), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	if (!syscon)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	if (of_address_to_resource(np, 0, &res)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		goto err_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	base = ioremap(res.start, resource_size(&res));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	if (!base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		goto err_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	/* Parse the device's DT node for an endianness specification */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (of_property_read_bool(np, "big-endian"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		syscon_config.val_format_endian = REGMAP_ENDIAN_BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	else if (of_property_read_bool(np, "little-endian"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		syscon_config.val_format_endian = REGMAP_ENDIAN_LITTLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	else if (of_property_read_bool(np, "native-endian"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		syscon_config.val_format_endian = REGMAP_ENDIAN_NATIVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	 * search for reg-io-width property in DT. If it is not provided,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	 * default to 4 bytes. regmap_init_mmio will return an error if values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	 * are invalid so there is no need to check them here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	ret = of_property_read_u32(np, "reg-io-width", &reg_io_width);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		reg_io_width = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	ret = of_hwspin_lock_get_id(np, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (ret > 0 || (IS_ENABLED(CONFIG_HWSPINLOCK) && ret == 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		syscon_config.use_hwlock = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		syscon_config.hwlock_id = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		syscon_config.hwlock_mode = HWLOCK_IRQSTATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	} else if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		case -ENOENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			/* Ignore missing hwlock, it's optional. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			pr_err("Failed to retrieve valid hwlock: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		case -EPROBE_DEFER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			goto err_regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	syscon_config.name = kasprintf(GFP_KERNEL, "%pOFn@%llx", np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 				       (u64)res.start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	syscon_config.reg_stride = reg_io_width;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	syscon_config.val_bits = reg_io_width * 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	syscon_config.max_register = resource_size(&res) - reg_io_width;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	regmap = regmap_init_mmio(NULL, base, &syscon_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	kfree(syscon_config.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	if (IS_ERR(regmap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		pr_err("regmap init failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		ret = PTR_ERR(regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		goto err_regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	if (check_clk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		clk = of_clk_get(np, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		if (IS_ERR(clk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			ret = PTR_ERR(clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 			/* clock is optional */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			if (ret != -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 				goto err_clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 			ret = regmap_mmio_attach_clk(regmap, clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 				goto err_attach;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	syscon->regmap = regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	syscon->np = np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	spin_lock(&syscon_list_slock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	list_add_tail(&syscon->list, &syscon_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	spin_unlock(&syscon_list_slock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	return syscon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) err_attach:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if (!IS_ERR(clk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		clk_put(clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) err_clk:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	regmap_exit(regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) err_regmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	iounmap(base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) err_map:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	kfree(syscon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static struct regmap *device_node_get_regmap(struct device_node *np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 					     bool check_clk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	struct syscon *entry, *syscon = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	spin_lock(&syscon_list_slock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	list_for_each_entry(entry, &syscon_list, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		if (entry->np == np) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			syscon = entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	spin_unlock(&syscon_list_slock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	if (!syscon)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		syscon = of_syscon_register(np, check_clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (IS_ERR(syscon))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		return ERR_CAST(syscon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	return syscon->regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) struct regmap *device_node_to_regmap(struct device_node *np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	return device_node_get_regmap(np, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) EXPORT_SYMBOL_GPL(device_node_to_regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct regmap *syscon_node_to_regmap(struct device_node *np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (!of_device_is_compatible(np, "syscon"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	return device_node_get_regmap(np, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) EXPORT_SYMBOL_GPL(syscon_node_to_regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	struct device_node *syscon_np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	syscon_np = of_find_compatible_node(NULL, NULL, s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	if (!syscon_np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		return ERR_PTR(-ENODEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	regmap = syscon_node_to_regmap(syscon_np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	of_node_put(syscon_np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	return regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 					const char *property)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	struct device_node *syscon_np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	if (property)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		syscon_np = of_parse_phandle(np, property, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		syscon_np = np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (!syscon_np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		return ERR_PTR(-ENODEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	regmap = syscon_node_to_regmap(syscon_np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	of_node_put(syscon_np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	return regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) struct regmap *syscon_regmap_lookup_by_phandle_args(struct device_node *np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 					const char *property,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 					int arg_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 					unsigned int *out_args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	struct device_node *syscon_np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	struct of_phandle_args args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	unsigned int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	rc = of_parse_phandle_with_fixed_args(np, property, arg_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 			0, &args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		return ERR_PTR(rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	syscon_np = args.np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (!syscon_np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		return ERR_PTR(-ENODEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	regmap = syscon_node_to_regmap(syscon_np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	for (index = 0; index < arg_count; index++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		out_args[index] = args.args[index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	of_node_put(syscon_np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	return regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static int syscon_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	struct syscon_platform_data *pdata = dev_get_platdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	struct syscon *syscon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	struct regmap_config syscon_config = syscon_regmap_config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	if (!syscon)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	if (!res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	base = devm_ioremap(dev, res->start, resource_size(res));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	if (!base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	syscon_config.max_register = resource_size(res) - 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	if (pdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		syscon_config.name = pdata->label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	syscon->regmap = devm_regmap_init_mmio(dev, base, &syscon_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	if (IS_ERR(syscon->regmap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		dev_err(dev, "regmap init failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		return PTR_ERR(syscon->regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	platform_set_drvdata(pdev, syscon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	dev_dbg(dev, "regmap %pR registered\n", res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) static const struct platform_device_id syscon_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	{ "syscon", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static struct platform_driver syscon_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		.name = "syscon",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	.probe		= syscon_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	.id_table	= syscon_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) static int __init syscon_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	return platform_driver_register(&syscon_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) postcore_initcall(syscon_init);