--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
+ *
+ * Authors:
+ * Serge Semin <Sergey.Semin@baikalelectronics.ru>
+ *
+ * Baikal-T1 APB-bus driver
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/atomic.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/nmi.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <linux/time64.h>
+#include <linux/clk.h>
+#include <linux/sysfs.h>
+
+#define APB_EHB_ISR 0x00
+#define APB_EHB_ISR_PENDING BIT(0)
+#define APB_EHB_ISR_MASK BIT(1)
+#define APB_EHB_ADDR 0x04
+#define APB_EHB_TIMEOUT 0x08
+
+#define APB_EHB_TIMEOUT_MIN 0x000003FFU
+#define APB_EHB_TIMEOUT_MAX 0xFFFFFFFFU
+
+/*
+ * struct bt1_apb - Baikal-T1 APB EHB private data
+ * @dev: Pointer to the device structure.
+ * @regs: APB EHB registers map.
+ * @res: No-device error injection memory region.
+ * @irq: Errors IRQ number.
+ * @rate: APB-bus reference clock rate.
+ * @pclk: APB-reference clock.
+ * @prst: APB domain reset line.
+ * @count: Number of errors detected.
+ */
+struct bt1_apb {
+ struct device *dev;
+
+ struct regmap *regs;
+ void __iomem *res;
+ int irq;
+
+ unsigned long rate;
+ struct clk *pclk;
+
+ struct reset_control *prst;
+
+ atomic_t count;
+};
+
+static const struct regmap_config bt1_apb_regmap_cfg = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = APB_EHB_TIMEOUT,
+ .fast_io = true
+};
+
+static inline unsigned long bt1_apb_n_to_timeout_us(struct bt1_apb *apb, u32 n)
+{
+ u64 timeout = (u64)n * USEC_PER_SEC;
+
+ do_div(timeout, apb->rate);
+
+ return timeout;
+
+}
+
+static inline unsigned long bt1_apb_timeout_to_n_us(struct bt1_apb *apb,
+ unsigned long timeout)
+{
+ u64 n = (u64)timeout * apb->rate;
+
+ do_div(n, USEC_PER_SEC);
+
+ return n;
+
+}
+
+static irqreturn_t bt1_apb_isr(int irq, void *data)
+{
+ struct bt1_apb *apb = data;
+ u32 addr = 0;
+
+ regmap_read(apb->regs, APB_EHB_ADDR, &addr);
+
+ dev_crit_ratelimited(apb->dev,
+ "APB-bus fault %d: Slave access timeout at 0x%08x\n",
+ atomic_inc_return(&apb->count),
+ addr);
+
+ /*
+ * Print backtrace on each CPU. This might be pointless if the fault
+ * has happened on the same CPU as the IRQ handler is executed or
+ * the other core proceeded further execution despite the error.
+ * But if it's not, by looking at the trace we would get straight to
+ * the cause of the problem.
+ */
+ trigger_all_cpu_backtrace();
+
+ regmap_update_bits(apb->regs, APB_EHB_ISR, APB_EHB_ISR_PENDING, 0);
+
+ return IRQ_HANDLED;
+}
+
+static void bt1_apb_clear_data(void *data)
+{
+ struct bt1_apb *apb = data;
+ struct platform_device *pdev = to_platform_device(apb->dev);
+
+ platform_set_drvdata(pdev, NULL);
+}
+
+static struct bt1_apb *bt1_apb_create_data(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct bt1_apb *apb;
+ int ret;
+
+ apb = devm_kzalloc(dev, sizeof(*apb), GFP_KERNEL);
+ if (!apb)
+ return ERR_PTR(-ENOMEM);
+
+ ret = devm_add_action(dev, bt1_apb_clear_data, apb);
+ if (ret) {
+ dev_err(dev, "Can't add APB EHB data clear action\n");
+ return ERR_PTR(ret);
+ }
+
+ apb->dev = dev;
+ atomic_set(&apb->count, 0);
+ platform_set_drvdata(pdev, apb);
+
+ return apb;
+}
+
+static int bt1_apb_request_regs(struct bt1_apb *apb)
+{
+ struct platform_device *pdev = to_platform_device(apb->dev);
+ void __iomem *regs;
+
+ regs = devm_platform_ioremap_resource_byname(pdev, "ehb");
+ if (IS_ERR(regs)) {
+ dev_err(apb->dev, "Couldn't map APB EHB registers\n");
+ return PTR_ERR(regs);
+ }
+
+ apb->regs = devm_regmap_init_mmio(apb->dev, regs, &bt1_apb_regmap_cfg);
+ if (IS_ERR(apb->regs)) {
+ dev_err(apb->dev, "Couldn't create APB EHB regmap\n");
+ return PTR_ERR(apb->regs);
+ }
+
+ apb->res = devm_platform_ioremap_resource_byname(pdev, "nodev");
+ if (IS_ERR(apb->res)) {
+ dev_err(apb->dev, "Couldn't map reserved region\n");
+ return PTR_ERR(apb->res);
+ }
+
+ return 0;
+}
+
+static int bt1_apb_request_rst(struct bt1_apb *apb)
+{
+ int ret;
+
+ apb->prst = devm_reset_control_get_optional_exclusive(apb->dev, "prst");
+ if (IS_ERR(apb->prst)) {
+ dev_warn(apb->dev, "Couldn't get reset control line\n");
+ return PTR_ERR(apb->prst);
+ }
+
+ ret = reset_control_deassert(apb->prst);
+ if (ret)
+ dev_err(apb->dev, "Failed to deassert the reset line\n");
+
+ return ret;
+}
+
+static void bt1_apb_disable_clk(void *data)
+{
+ struct bt1_apb *apb = data;
+
+ clk_disable_unprepare(apb->pclk);
+}
+
+static int bt1_apb_request_clk(struct bt1_apb *apb)
+{
+ int ret;
+
+ apb->pclk = devm_clk_get(apb->dev, "pclk");
+ if (IS_ERR(apb->pclk)) {
+ dev_err(apb->dev, "Couldn't get APB clock descriptor\n");
+ return PTR_ERR(apb->pclk);
+ }
+
+ ret = clk_prepare_enable(apb->pclk);
+ if (ret) {
+ dev_err(apb->dev, "Couldn't enable the APB clock\n");
+ return ret;
+ }
+
+ ret = devm_add_action_or_reset(apb->dev, bt1_apb_disable_clk, apb);
+ if (ret) {
+ dev_err(apb->dev, "Can't add APB EHB clocks disable action\n");
+ return ret;
+ }
+
+ apb->rate = clk_get_rate(apb->pclk);
+ if (!apb->rate) {
+ dev_err(apb->dev, "Invalid clock rate\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void bt1_apb_clear_irq(void *data)
+{
+ struct bt1_apb *apb = data;
+
+ regmap_update_bits(apb->regs, APB_EHB_ISR, APB_EHB_ISR_MASK, 0);
+}
+
+static int bt1_apb_request_irq(struct bt1_apb *apb)
+{
+ struct platform_device *pdev = to_platform_device(apb->dev);
+ int ret;
+
+ apb->irq = platform_get_irq(pdev, 0);
+ if (apb->irq < 0)
+ return apb->irq;
+
+ ret = devm_request_irq(apb->dev, apb->irq, bt1_apb_isr, IRQF_SHARED,
+ "bt1-apb", apb);
+ if (ret) {
+ dev_err(apb->dev, "Couldn't request APB EHB IRQ\n");
+ return ret;
+ }
+
+ ret = devm_add_action(apb->dev, bt1_apb_clear_irq, apb);
+ if (ret) {
+ dev_err(apb->dev, "Can't add APB EHB IRQs clear action\n");
+ return ret;
+ }
+
+ /* Unmask IRQ and clear it' pending flag. */
+ regmap_update_bits(apb->regs, APB_EHB_ISR,
+ APB_EHB_ISR_PENDING | APB_EHB_ISR_MASK,
+ APB_EHB_ISR_MASK);
+
+ return 0;
+}
+
+static ssize_t count_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct bt1_apb *apb = dev_get_drvdata(dev);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&apb->count));
+}
+static DEVICE_ATTR_RO(count);
+
+static ssize_t timeout_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct bt1_apb *apb = dev_get_drvdata(dev);
+ unsigned long timeout;
+ int ret;
+ u32 n;
+
+ ret = regmap_read(apb->regs, APB_EHB_TIMEOUT, &n);
+ if (ret)
+ return ret;
+
+ timeout = bt1_apb_n_to_timeout_us(apb, n);
+
+ return scnprintf(buf, PAGE_SIZE, "%lu\n", timeout);
+}
+
+static ssize_t timeout_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct bt1_apb *apb = dev_get_drvdata(dev);
+ unsigned long timeout;
+ int ret;
+ u32 n;
+
+ if (kstrtoul(buf, 0, &timeout) < 0)
+ return -EINVAL;
+
+ n = bt1_apb_timeout_to_n_us(apb, timeout);
+ n = clamp(n, APB_EHB_TIMEOUT_MIN, APB_EHB_TIMEOUT_MAX);
+
+ ret = regmap_write(apb->regs, APB_EHB_TIMEOUT, n);
+
+ return ret ?: count;
+}
+static DEVICE_ATTR_RW(timeout);
+
+static ssize_t inject_error_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return scnprintf(buf, PAGE_SIZE, "Error injection: nodev irq\n");
+}
+
+static ssize_t inject_error_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *data, size_t count)
+{
+ struct bt1_apb *apb = dev_get_drvdata(dev);
+
+ /*
+ * Either dummy read from the unmapped address in the APB IO area
+ * or manually set the IRQ status.
+ */
+ if (!strncmp(data, "nodev", 5))
+ readl(apb->res);
+ else if (!strncmp(data, "irq", 3))
+ regmap_update_bits(apb->regs, APB_EHB_ISR, APB_EHB_ISR_PENDING,
+ APB_EHB_ISR_PENDING);
+ else
+ return -EINVAL;
+
+ return count;
+}
+static DEVICE_ATTR_RW(inject_error);
+
+static struct attribute *bt1_apb_sysfs_attrs[] = {
+ &dev_attr_count.attr,
+ &dev_attr_timeout.attr,
+ &dev_attr_inject_error.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(bt1_apb_sysfs);
+
+static void bt1_apb_remove_sysfs(void *data)
+{
+ struct bt1_apb *apb = data;
+
+ device_remove_groups(apb->dev, bt1_apb_sysfs_groups);
+}
+
+static int bt1_apb_init_sysfs(struct bt1_apb *apb)
+{
+ int ret;
+
+ ret = device_add_groups(apb->dev, bt1_apb_sysfs_groups);
+ if (ret) {
+ dev_err(apb->dev, "Failed to create EHB APB sysfs nodes\n");
+ return ret;
+ }
+
+ ret = devm_add_action_or_reset(apb->dev, bt1_apb_remove_sysfs, apb);
+ if (ret)
+ dev_err(apb->dev, "Can't add APB EHB sysfs remove action\n");
+
+ return ret;
+}
+
+static int bt1_apb_probe(struct platform_device *pdev)
+{
+ struct bt1_apb *apb;
+ int ret;
+
+ apb = bt1_apb_create_data(pdev);
+ if (IS_ERR(apb))
+ return PTR_ERR(apb);
+
+ ret = bt1_apb_request_regs(apb);
+ if (ret)
+ return ret;
+
+ ret = bt1_apb_request_rst(apb);
+ if (ret)
+ return ret;
+
+ ret = bt1_apb_request_clk(apb);
+ if (ret)
+ return ret;
+
+ ret = bt1_apb_request_irq(apb);
+ if (ret)
+ return ret;
+
+ ret = bt1_apb_init_sysfs(apb);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static const struct of_device_id bt1_apb_of_match[] = {
+ { .compatible = "baikal,bt1-apb" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, bt1_apb_of_match);
+
+static struct platform_driver bt1_apb_driver = {
+ .probe = bt1_apb_probe,
+ .driver = {
+ .name = "bt1-apb",
+ .of_match_table = bt1_apb_of_match
+ }
+};
+module_platform_driver(bt1_apb_driver);
+
+MODULE_AUTHOR("Serge Semin <Sergey.Semin@baikalelectronics.ru>");
+MODULE_DESCRIPTION("Baikal-T1 APB-bus driver");
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-rpi.git / commitdiff