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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 | // SPDX-License-Identifier: GPL-2.0 /* * Spreadtrum hardware spinlock driver * Copyright (C) 2017 Spreadtrum - http://www.spreadtrum.com */ #include <linux/bitops.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/hwspinlock.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/slab.h> #include "hwspinlock_internal.h" /* hwspinlock registers definition */ #define HWSPINLOCK_RECCTRL 0x4 #define HWSPINLOCK_MASTERID(_X_) (0x80 + 0x4 * (_X_)) #define HWSPINLOCK_TOKEN(_X_) (0x800 + 0x4 * (_X_)) /* unlocked value */ #define HWSPINLOCK_NOTTAKEN 0x55aa10c5 /* bits definition of RECCTRL reg */ #define HWSPINLOCK_USER_BITS 0x1 /* hwspinlock number */ #define SPRD_HWLOCKS_NUM 32 struct sprd_hwspinlock_dev { void __iomem *base; struct clk *clk; struct hwspinlock_device bank; }; /* try to lock the hardware spinlock */ static int sprd_hwspinlock_trylock(struct hwspinlock *lock) { struct sprd_hwspinlock_dev *sprd_hwlock = dev_get_drvdata(lock->bank->dev); void __iomem *addr = lock->priv; int user_id, lock_id; if (!readl(addr)) return 1; lock_id = hwlock_to_id(lock); /* get the hardware spinlock master/user id */ user_id = readl(sprd_hwlock->base + HWSPINLOCK_MASTERID(lock_id)); dev_warn(sprd_hwlock->bank.dev, "hwspinlock [%d] lock failed and master/user id = %d!\n", lock_id, user_id); return 0; } /* unlock the hardware spinlock */ static void sprd_hwspinlock_unlock(struct hwspinlock *lock) { void __iomem *lock_addr = lock->priv; writel(HWSPINLOCK_NOTTAKEN, lock_addr); } /* The specs recommended below number as the retry delay time */ static void sprd_hwspinlock_relax(struct hwspinlock *lock) { ndelay(10); } static const struct hwspinlock_ops sprd_hwspinlock_ops = { .trylock = sprd_hwspinlock_trylock, .unlock = sprd_hwspinlock_unlock, .relax = sprd_hwspinlock_relax, }; static void sprd_hwspinlock_disable(void *data) { struct sprd_hwspinlock_dev *sprd_hwlock = data; clk_disable_unprepare(sprd_hwlock->clk); } static int sprd_hwspinlock_probe(struct platform_device *pdev) { struct sprd_hwspinlock_dev *sprd_hwlock; struct hwspinlock *lock; int i, ret; if (!pdev->dev.of_node) return -ENODEV; sprd_hwlock = devm_kzalloc(&pdev->dev, sizeof(struct sprd_hwspinlock_dev) + SPRD_HWLOCKS_NUM * sizeof(*lock), GFP_KERNEL); if (!sprd_hwlock) return -ENOMEM; sprd_hwlock->base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(sprd_hwlock->base)) return PTR_ERR(sprd_hwlock->base); sprd_hwlock->clk = devm_clk_get(&pdev->dev, "enable"); if (IS_ERR(sprd_hwlock->clk)) { dev_err(&pdev->dev, "get hwspinlock clock failed!\n"); return PTR_ERR(sprd_hwlock->clk); } ret = clk_prepare_enable(sprd_hwlock->clk); if (ret) return ret; ret = devm_add_action_or_reset(&pdev->dev, sprd_hwspinlock_disable, sprd_hwlock); if (ret) { dev_err(&pdev->dev, "Failed to add hwspinlock disable action\n"); return ret; } /* set the hwspinlock to record user id to identify subsystems */ writel(HWSPINLOCK_USER_BITS, sprd_hwlock->base + HWSPINLOCK_RECCTRL); for (i = 0; i < SPRD_HWLOCKS_NUM; i++) { lock = &sprd_hwlock->bank.lock[i]; lock->priv = sprd_hwlock->base + HWSPINLOCK_TOKEN(i); } platform_set_drvdata(pdev, sprd_hwlock); return devm_hwspin_lock_register(&pdev->dev, &sprd_hwlock->bank, &sprd_hwspinlock_ops, 0, SPRD_HWLOCKS_NUM); } static const struct of_device_id sprd_hwspinlock_of_match[] = { { .compatible = "sprd,hwspinlock-r3p0", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, sprd_hwspinlock_of_match); static struct platform_driver sprd_hwspinlock_driver = { .probe = sprd_hwspinlock_probe, .driver = { .name = "sprd_hwspinlock", .of_match_table = of_match_ptr(sprd_hwspinlock_of_match), }, }; static int __init sprd_hwspinlock_init(void) { return platform_driver_register(&sprd_hwspinlock_driver); } postcore_initcall(sprd_hwspinlock_init); static void __exit sprd_hwspinlock_exit(void) { platform_driver_unregister(&sprd_hwspinlock_driver); } module_exit(sprd_hwspinlock_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("Hardware spinlock driver for Spreadtrum"); MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>"); MODULE_AUTHOR("Lanqing Liu <lanqing.liu@spreadtrum.com>"); MODULE_AUTHOR("Long Cheng <aiden.cheng@spreadtrum.com>"); |