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Mon, 15 Apr 2019 04:41:41 -0700 (PDT) From: Yash Shah To: devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org Subject: [PATCH 2/3] RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs Date: Mon, 15 Apr 2019 17:10:42 +0530 Message-Id: <1555328443-30874-3-git-send-email-yash.shah@sifive.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1555328443-30874-1-git-send-email-yash.shah@sifive.com> References: <1555328443-30874-1-git-send-email-yash.shah@sifive.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190415_044142_624107_C7014D12 X-CRM114-Status: GOOD ( 17.05 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, aou@eecs.berkeley.edu, palmer@sifive.com, sachin.ghadi@sifive.com, Yash Shah , robh+dt@kernel.org, bp@alien8.de, paul.walmsley@sifive.com, james.morse@arm.com, mchehab@kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org This driver currently supports only SiFive FU540-C000 platform. The initial version of L2 cache controller driver supports: - Initial configuration reporting at boot up. - Support for ECC related functionality. Signed-off-by: Yash Shah --- arch/riscv/mm/Makefile | 1 + arch/riscv/mm/sifive_l2_cache.c | 224 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 225 insertions(+) create mode 100644 arch/riscv/mm/sifive_l2_cache.c diff --git a/arch/riscv/mm/Makefile b/arch/riscv/mm/Makefile index eb22ab4..1523ee5 100644 --- a/arch/riscv/mm/Makefile +++ b/arch/riscv/mm/Makefile @@ -3,3 +3,4 @@ obj-y += fault.o obj-y += extable.o obj-y += ioremap.o obj-y += cacheflush.o +obj-y += sifive_l2_cache.o diff --git a/arch/riscv/mm/sifive_l2_cache.c b/arch/riscv/mm/sifive_l2_cache.c new file mode 100644 index 0000000..95f10e4 --- /dev/null +++ b/arch/riscv/mm/sifive_l2_cache.c @@ -0,0 +1,224 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SiFive L2 cache controller Driver + * + * Copyright (C) 2018-2019 SiFive, Inc. + * + */ +#include +#include +#include +#include + +#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_ERR_TYPE_CE 0 +#define SIFIVE_L2_ERR_TYPE_UE 1 +#define SIFIVE_L2_MAX_ECCINTR 3 + +static void __iomem *l2_base; +static int g_irq[SIFIVE_L2_MAX_ECCINTR]; + +enum { + DIR_CORR = 0, + DATA_CORR, + DATA_UNCORR, +}; + +static unsigned int l2_dirfix_addr_high(void) +{ + return readl(l2_base + SIFIVE_L2_DIRECCFIX_HIGH); +} + +static unsigned int l2_dirfix_addr_low(void) +{ + return readl(l2_base + SIFIVE_L2_DIRECCFIX_LOW); +} + +static unsigned int l2_dirfix_count(void) +{ + return readl(l2_base + SIFIVE_L2_DIRECCFIX_COUNT); +} + +static unsigned int l2_datfix_addr_high(void) +{ + return readl(l2_base + SIFIVE_L2_DATECCFIX_HIGH); +} + +static unsigned int l2_datfix_addr_low(void) +{ + return readl(l2_base + SIFIVE_L2_DATECCFIX_LOW); +} + +static unsigned int l2_datfix_count(void) +{ + return readl(l2_base + SIFIVE_L2_DATECCFIX_COUNT); +} + +static unsigned int l2_datfail_addr_high(void) +{ + return readl(l2_base + SIFIVE_L2_DATECCFAIL_HIGH); +} + +static unsigned int l2_datfail_addr_low(void) +{ + return readl(l2_base + SIFIVE_L2_DATECCFAIL_LOW); +} + +static unsigned int l2_datfail_count(void) +{ + return readl(l2_base + SIFIVE_L2_DATECCFAIL_COUNT); +} + +#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 >= 0 && 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); + if (!sifive_test) + return; + + if (!debugfs_create_file("sifive_debug_inject_error", 0200, + sifive_test, NULL, &l2_fops)) + debugfs_remove_recursive(sifive_test); +} +#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 irqreturn_t l2_int_handler(int irq, void *device) +{ + unsigned int regval, add_h, add_l; + + if (irq == g_irq[DIR_CORR]) { + add_h = l2_dirfix_addr_high(); + add_l = l2_dirfix_addr_low(); + pr_err("L2CACHE: DirError @ 0x%08X.%08X\n", add_h, add_l); + regval = l2_dirfix_count(); + atomic_notifier_call_chain(&l2_err_chain, SIFIVE_L2_ERR_TYPE_CE, + "DirECCFix"); + } + if (irq == g_irq[DATA_CORR]) { + add_h = l2_datfix_addr_high(); + add_l = l2_datfix_addr_low(); + pr_err("L2CACHE: DataError @ 0x%08X.%08X\n", add_h, add_l); + regval = l2_datfix_count(); + atomic_notifier_call_chain(&l2_err_chain, SIFIVE_L2_ERR_TYPE_CE, + "DatECCFix"); + } + if (irq == g_irq[DATA_UNCORR]) { + add_h = l2_datfail_addr_high(); + add_l = l2_datfail_addr_low(); + pr_err("L2CACHE: DataFail @ 0x%08X.%08X\n", add_h, add_l); + regval = l2_datfail_count(); + atomic_notifier_call_chain(&l2_err_chain, SIFIVE_L2_ERR_TYPE_UE, + "DatECCFail"); + } + + return IRQ_HANDLED; +} + +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(); + +#ifdef CONFIG_DEBUG_FS + setup_sifive_debug(); +#endif + return 0; +} +device_initcall(sifive_l2_init); -- 1.9.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv