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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | /* * Copyright (C) 2014 Marvell Technology Group Ltd. * * Antoine Tenart <antoine.tenart@free-electrons.com> * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include <linux/delay.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/platform_device.h> #include <linux/reset-controller.h> #include <linux/slab.h> #include <linux/types.h> #define BERLIN_MAX_RESETS 32 #define to_berlin_reset_priv(p) \ container_of((p), struct berlin_reset_priv, rcdev) struct berlin_reset_priv { void __iomem *base; unsigned int size; struct reset_controller_dev rcdev; }; static int berlin_reset_reset(struct reset_controller_dev *rcdev, unsigned long id) { struct berlin_reset_priv *priv = to_berlin_reset_priv(rcdev); int offset = id >> 8; int mask = BIT(id & 0x1f); writel(mask, priv->base + offset); /* let the reset be effective */ udelay(10); return 0; } static struct reset_control_ops berlin_reset_ops = { .reset = berlin_reset_reset, }; static int berlin_reset_xlate(struct reset_controller_dev *rcdev, const struct of_phandle_args *reset_spec) { struct berlin_reset_priv *priv = to_berlin_reset_priv(rcdev); unsigned offset, bit; if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells)) return -EINVAL; offset = reset_spec->args[0]; bit = reset_spec->args[1]; if (offset >= priv->size) return -EINVAL; if (bit >= BERLIN_MAX_RESETS) return -EINVAL; return (offset << 8) | bit; } static int __berlin_reset_init(struct device_node *np) { struct berlin_reset_priv *priv; struct resource res; resource_size_t size; int ret; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; ret = of_address_to_resource(np, 0, &res); if (ret) goto err; size = resource_size(&res); priv->base = ioremap(res.start, size); if (!priv->base) { ret = -ENOMEM; goto err; } priv->size = size; priv->rcdev.owner = THIS_MODULE; priv->rcdev.ops = &berlin_reset_ops; priv->rcdev.of_node = np; priv->rcdev.of_reset_n_cells = 2; priv->rcdev.of_xlate = berlin_reset_xlate; reset_controller_register(&priv->rcdev); return 0; err: kfree(priv); return ret; } static const struct of_device_id berlin_reset_of_match[] __initconst = { { .compatible = "marvell,berlin2-chip-ctrl" }, { .compatible = "marvell,berlin2cd-chip-ctrl" }, { .compatible = "marvell,berlin2q-chip-ctrl" }, { }, }; static int __init berlin_reset_init(void) { struct device_node *np; int ret; for_each_matching_node(np, berlin_reset_of_match) { ret = __berlin_reset_init(np); if (ret) return ret; } return 0; } arch_initcall(berlin_reset_init); |