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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 | // SPDX-License-Identifier: GPL-2.0 /* * SiFive L2 cache controller Driver * * Copyright (C) 2018-2019 SiFive, Inc. * */ #include <linux/debugfs.h> #include <linux/interrupt.h> #include <linux/of_irq.h> #include <linux/of_address.h> #include <linux/device.h> #include <asm/cacheinfo.h> #include <soc/sifive/sifive_l2_cache.h> #define SIFIVE_L2_DIRECCFIX_LOW 0x100 #define SIFIVE_L2_DIRECCFIX_HIGH 0x104 #define SIFIVE_L2_DIRECCFIX_COUNT 0x108 #define SIFIVE_L2_DATECCFIX_LOW 0x140 #define SIFIVE_L2_DATECCFIX_HIGH 0x144 #define SIFIVE_L2_DATECCFIX_COUNT 0x148 #define SIFIVE_L2_DATECCFAIL_LOW 0x160 #define SIFIVE_L2_DATECCFAIL_HIGH 0x164 #define SIFIVE_L2_DATECCFAIL_COUNT 0x168 #define SIFIVE_L2_CONFIG 0x00 #define SIFIVE_L2_WAYENABLE 0x08 #define SIFIVE_L2_ECCINJECTERR 0x40 #define SIFIVE_L2_MAX_ECCINTR 3 static void __iomem *l2_base; static int g_irq[SIFIVE_L2_MAX_ECCINTR]; static struct riscv_cacheinfo_ops l2_cache_ops; enum { DIR_CORR = 0, DATA_CORR, DATA_UNCORR, }; #ifdef CONFIG_DEBUG_FS static struct dentry *sifive_test; static ssize_t l2_write(struct file *file, const char __user *data, size_t count, loff_t *ppos) { unsigned int val; if (kstrtouint_from_user(data, count, 0, &val)) return -EINVAL; if ((val < 0xFF) || (val >= 0x10000 && val < 0x100FF)) writel(val, l2_base + SIFIVE_L2_ECCINJECTERR); else return -EINVAL; return count; } static const struct file_operations l2_fops = { .owner = THIS_MODULE, .open = simple_open, .write = l2_write }; static void setup_sifive_debug(void) { sifive_test = debugfs_create_dir("sifive_l2_cache", NULL); debugfs_create_file("sifive_debug_inject_error", 0200, sifive_test, NULL, &l2_fops); } #endif static void l2_config_read(void) { u32 regval, val; regval = readl(l2_base + SIFIVE_L2_CONFIG); val = regval & 0xFF; pr_info("L2CACHE: No. of Banks in the cache: %d\n", val); val = (regval & 0xFF00) >> 8; pr_info("L2CACHE: No. of ways per bank: %d\n", val); val = (regval & 0xFF0000) >> 16; pr_info("L2CACHE: Sets per bank: %llu\n", (uint64_t)1 << val); val = (regval & 0xFF000000) >> 24; pr_info("L2CACHE: Bytes per cache block: %llu\n", (uint64_t)1 << val); regval = readl(l2_base + SIFIVE_L2_WAYENABLE); pr_info("L2CACHE: Index of the largest way enabled: %d\n", regval); } static const struct of_device_id sifive_l2_ids[] = { { .compatible = "sifive,fu540-c000-ccache" }, { /* end of table */ }, }; static ATOMIC_NOTIFIER_HEAD(l2_err_chain); int register_sifive_l2_error_notifier(struct notifier_block *nb) { return atomic_notifier_chain_register(&l2_err_chain, nb); } EXPORT_SYMBOL_GPL(register_sifive_l2_error_notifier); int unregister_sifive_l2_error_notifier(struct notifier_block *nb) { return atomic_notifier_chain_unregister(&l2_err_chain, nb); } EXPORT_SYMBOL_GPL(unregister_sifive_l2_error_notifier); static int l2_largest_wayenabled(void) { return readl(l2_base + SIFIVE_L2_WAYENABLE) & 0xFF; } static ssize_t number_of_ways_enabled_show(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "%u\n", l2_largest_wayenabled()); } static DEVICE_ATTR_RO(number_of_ways_enabled); static struct attribute *priv_attrs[] = { &dev_attr_number_of_ways_enabled.attr, NULL, }; static const struct attribute_group priv_attr_group = { .attrs = priv_attrs, }; static const struct attribute_group *l2_get_priv_group(struct cacheinfo *this_leaf) { /* We want to use private group for L2 cache only */ if (this_leaf->level == 2) return &priv_attr_group; else return NULL; } static irqreturn_t l2_int_handler(int irq, void *device) { unsigned int add_h, add_l; if (irq == g_irq[DIR_CORR]) { add_h = readl(l2_base + SIFIVE_L2_DIRECCFIX_HIGH); add_l = readl(l2_base + SIFIVE_L2_DIRECCFIX_LOW); pr_err("L2CACHE: DirError @ 0x%08X.%08X\n", add_h, add_l); /* Reading this register clears the DirError interrupt sig */ readl(l2_base + SIFIVE_L2_DIRECCFIX_COUNT); atomic_notifier_call_chain(&l2_err_chain, SIFIVE_L2_ERR_TYPE_CE, "DirECCFix"); } if (irq == g_irq[DATA_CORR]) { add_h = readl(l2_base + SIFIVE_L2_DATECCFIX_HIGH); add_l = readl(l2_base + SIFIVE_L2_DATECCFIX_LOW); pr_err("L2CACHE: DataError @ 0x%08X.%08X\n", add_h, add_l); /* Reading this register clears the DataError interrupt sig */ readl(l2_base + SIFIVE_L2_DATECCFIX_COUNT); atomic_notifier_call_chain(&l2_err_chain, SIFIVE_L2_ERR_TYPE_CE, "DatECCFix"); } if (irq == g_irq[DATA_UNCORR]) { add_h = readl(l2_base + SIFIVE_L2_DATECCFAIL_HIGH); add_l = readl(l2_base + SIFIVE_L2_DATECCFAIL_LOW); pr_err("L2CACHE: DataFail @ 0x%08X.%08X\n", add_h, add_l); /* Reading this register clears the DataFail interrupt sig */ readl(l2_base + SIFIVE_L2_DATECCFAIL_COUNT); atomic_notifier_call_chain(&l2_err_chain, SIFIVE_L2_ERR_TYPE_UE, "DatECCFail"); } return IRQ_HANDLED; } static int __init sifive_l2_init(void) { struct device_node *np; struct resource res; int i, rc; np = of_find_matching_node(NULL, sifive_l2_ids); if (!np) return -ENODEV; if (of_address_to_resource(np, 0, &res)) return -ENODEV; l2_base = ioremap(res.start, resource_size(&res)); if (!l2_base) return -ENOMEM; for (i = 0; i < SIFIVE_L2_MAX_ECCINTR; i++) { g_irq[i] = irq_of_parse_and_map(np, i); rc = request_irq(g_irq[i], l2_int_handler, 0, "l2_ecc", NULL); if (rc) { pr_err("L2CACHE: Could not request IRQ %d\n", g_irq[i]); return rc; } } l2_config_read(); l2_cache_ops.get_priv_group = l2_get_priv_group; riscv_set_cacheinfo_ops(&l2_cache_ops); #ifdef CONFIG_DEBUG_FS setup_sifive_debug(); #endif return 0; } device_initcall(sifive_l2_init); |