diff options
Diffstat (limited to 'drivers/soc/sifive/sifive_l2_cache.c')
| -rw-r--r-- | drivers/soc/sifive/sifive_l2_cache.c | 237 |
1 files changed, 0 insertions, 237 deletions
diff --git a/drivers/soc/sifive/sifive_l2_cache.c b/drivers/soc/sifive/sifive_l2_cache.c deleted file mode 100644 index 59640a1d0b28..000000000000 --- a/drivers/soc/sifive/sifive_l2_cache.c +++ /dev/null @@ -1,237 +0,0 @@ -// 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_DIRECCFAIL_LOW 0x120 -#define SIFIVE_L2_DIRECCFAIL_HIGH 0x124 -#define SIFIVE_L2_DIRECCFAIL_COUNT 0x128 - -#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 4 - -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, - DIR_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" }, - { .compatible = "sifive,fu740-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[DIR_UNCORR]) { - add_h = readl(l2_base + SIFIVE_L2_DIRECCFAIL_HIGH); - add_l = readl(l2_base + SIFIVE_L2_DIRECCFAIL_LOW); - /* Reading this register clears the DirFail interrupt sig */ - readl(l2_base + SIFIVE_L2_DIRECCFAIL_COUNT); - atomic_notifier_call_chain(&l2_err_chain, SIFIVE_L2_ERR_TYPE_UE, - "DirECCFail"); - panic("L2CACHE: DirFail @ 0x%08X.%08X\n", add_h, add_l); - } - 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, intr_num; - - 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; - - intr_num = of_property_count_u32_elems(np, "interrupts"); - if (!intr_num) { - pr_err("L2CACHE: no interrupts property\n"); - return -ENODEV; - } - - for (i = 0; i < intr_num; 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); |