1 /* 2 * Copyright (C) 2015 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <syscon.h> 10 #include <dm.h> 11 #include <errno.h> 12 #include <regmap.h> 13 #include <dm/device-internal.h> 14 #include <dm/lists.h> 15 #include <dm/root.h> 16 #include <linux/err.h> 17 18 struct regmap *syscon_get_regmap(struct udevice *dev) 19 { 20 struct syscon_uc_info *priv; 21 22 if (device_get_uclass_id(dev) != UCLASS_SYSCON) 23 return ERR_PTR(-ENOEXEC); 24 priv = dev_get_uclass_priv(dev); 25 return priv->regmap; 26 } 27 28 static int syscon_pre_probe(struct udevice *dev) 29 { 30 struct syscon_uc_info *priv = dev_get_uclass_priv(dev); 31 32 /* 33 * With OF_PLATDATA we really have no way of knowing the format of 34 * the device-specific platform data. So we assume that it starts with 35 * a 'reg' member, and this holds a single address and size. Drivers 36 * using OF_PLATDATA will need to ensure that this is true. 37 */ 38 #if CONFIG_IS_ENABLED(OF_PLATDATA) 39 struct syscon_base_platdata *plat = dev_get_platdata(dev); 40 41 return regmap_init_mem_platdata(dev, plat->reg, ARRAY_SIZE(plat->reg), 42 &priv->regmap); 43 #else 44 return regmap_init_mem(dev, &priv->regmap); 45 #endif 46 } 47 48 int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp) 49 { 50 struct udevice *dev; 51 struct uclass *uc; 52 int ret; 53 54 *devp = NULL; 55 ret = uclass_get(UCLASS_SYSCON, &uc); 56 if (ret) 57 return ret; 58 uclass_foreach_dev(dev, uc) { 59 if (dev->driver_data == driver_data) { 60 *devp = dev; 61 return device_probe(dev); 62 } 63 } 64 65 return -ENODEV; 66 } 67 68 struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data) 69 { 70 struct syscon_uc_info *priv; 71 struct udevice *dev; 72 int ret; 73 74 ret = syscon_get_by_driver_data(driver_data, &dev); 75 if (ret) 76 return ERR_PTR(ret); 77 priv = dev_get_uclass_priv(dev); 78 79 return priv->regmap; 80 } 81 82 void *syscon_get_first_range(ulong driver_data) 83 { 84 struct regmap *map; 85 86 map = syscon_get_regmap_by_driver_data(driver_data); 87 if (IS_ERR(map)) 88 return map; 89 return regmap_get_range(map, 0); 90 } 91 92 UCLASS_DRIVER(syscon) = { 93 .id = UCLASS_SYSCON, 94 .name = "syscon", 95 .per_device_auto_alloc_size = sizeof(struct syscon_uc_info), 96 .pre_probe = syscon_pre_probe, 97 }; 98 99 static const struct udevice_id generic_syscon_ids[] = { 100 { .compatible = "syscon" }, 101 { } 102 }; 103 104 U_BOOT_DRIVER(generic_syscon) = { 105 .name = "syscon", 106 .id = UCLASS_SYSCON, 107 .of_match = generic_syscon_ids, 108 }; 109