--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2018 Google LLC
+ * Copyright (c) 2021 Aspeed Technology Inc.
+ */
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+#include <linux/platform_device.h>
+
+/* register offsets */
+#define HICR9 0x98
+#define HICRA 0x9c
+
+/* attributes options */
+#define UART_ROUTING_IO1 "io1"
+#define UART_ROUTING_IO2 "io2"
+#define UART_ROUTING_IO3 "io3"
+#define UART_ROUTING_IO4 "io4"
+#define UART_ROUTING_IO5 "io5"
+#define UART_ROUTING_IO6 "io6"
+#define UART_ROUTING_IO10 "io10"
+#define UART_ROUTING_UART1 "uart1"
+#define UART_ROUTING_UART2 "uart2"
+#define UART_ROUTING_UART3 "uart3"
+#define UART_ROUTING_UART4 "uart4"
+#define UART_ROUTING_UART5 "uart5"
+#define UART_ROUTING_UART6 "uart6"
+#define UART_ROUTING_UART10 "uart10"
+#define UART_ROUTING_RES "reserved"
+
+struct aspeed_uart_routing {
+ struct regmap *map;
+ struct attribute_group const *attr_grp;
+};
+
+struct aspeed_uart_routing_selector {
+ struct device_attribute dev_attr;
+ uint8_t reg;
+ uint8_t mask;
+ uint8_t shift;
+ const char *const options[];
+};
+
+#define to_routing_selector(_dev_attr) \
+ container_of(_dev_attr, struct aspeed_uart_routing_selector, dev_attr)
+
+static ssize_t aspeed_uart_routing_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf);
+
+static ssize_t aspeed_uart_routing_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count);
+
+#define ROUTING_ATTR(_name) { \
+ .attr = {.name = _name, \
+ .mode = VERIFY_OCTAL_PERMISSIONS(0644) }, \
+ .show = aspeed_uart_routing_show, \
+ .store = aspeed_uart_routing_store, \
+}
+
+/* routing selector for AST25xx */
+static struct aspeed_uart_routing_selector ast2500_io6_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO6),
+ .reg = HICR9,
+ .shift = 8,
+ .mask = 0xf,
+ .options = {
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART5,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO5,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_uart5_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART5),
+ .reg = HICRA,
+ .shift = 28,
+ .mask = 0xf,
+ .options = {
+ UART_ROUTING_IO5,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_uart4_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART4),
+ .reg = HICRA,
+ .shift = 25,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_uart3_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART3),
+ .reg = HICRA,
+ .shift = 22,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_uart2_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART2),
+ .reg = HICRA,
+ .shift = 19,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART1,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_uart1_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART1),
+ .reg = HICRA,
+ .shift = 16,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_io5_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO5),
+ .reg = HICRA,
+ .shift = 12,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART5,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_io4_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO4),
+ .reg = HICRA,
+ .shift = 9,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART5,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_io3_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO3),
+ .reg = HICRA,
+ .shift = 6,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART5,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_io2_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO2),
+ .reg = HICRA,
+ .shift = 3,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART5,
+ UART_ROUTING_UART1,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2500_io1_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO1),
+ .reg = HICRA,
+ .shift = 0,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART5,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO6,
+ NULL,
+ },
+};
+
+static struct attribute *ast2500_uart_routing_attrs[] = {
+ &ast2500_io6_sel.dev_attr.attr,
+ &ast2500_uart5_sel.dev_attr.attr,
+ &ast2500_uart4_sel.dev_attr.attr,
+ &ast2500_uart3_sel.dev_attr.attr,
+ &ast2500_uart2_sel.dev_attr.attr,
+ &ast2500_uart1_sel.dev_attr.attr,
+ &ast2500_io5_sel.dev_attr.attr,
+ &ast2500_io4_sel.dev_attr.attr,
+ &ast2500_io3_sel.dev_attr.attr,
+ &ast2500_io2_sel.dev_attr.attr,
+ &ast2500_io1_sel.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ast2500_uart_routing_attr_group = {
+ .attrs = ast2500_uart_routing_attrs,
+};
+
+/* routing selector for AST26xx */
+static struct aspeed_uart_routing_selector ast2600_uart10_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART10),
+ .reg = HICR9,
+ .shift = 12,
+ .mask = 0xf,
+ .options = {
+ UART_ROUTING_IO10,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_RES,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_io10_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO10),
+ .reg = HICR9,
+ .shift = 8,
+ .mask = 0xf,
+ .options = {
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_RES,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_RES,
+ UART_ROUTING_UART10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_uart4_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART4),
+ .reg = HICRA,
+ .shift = 25,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_uart3_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART3),
+ .reg = HICRA,
+ .shift = 22,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_uart2_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART2),
+ .reg = HICRA,
+ .shift = 19,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO1,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART1,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_uart1_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_UART1),
+ .reg = HICRA,
+ .shift = 16,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_io4_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO4),
+ .reg = HICRA,
+ .shift = 9,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART10,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_io3_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO3),
+ .reg = HICRA,
+ .shift = 6,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART10,
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_IO1,
+ UART_ROUTING_IO2,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_io2_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO2),
+ .reg = HICRA,
+ .shift = 3,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART10,
+ UART_ROUTING_UART1,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct aspeed_uart_routing_selector ast2600_io1_sel = {
+ .dev_attr = ROUTING_ATTR(UART_ROUTING_IO1),
+ .reg = HICRA,
+ .shift = 0,
+ .mask = 0x7,
+ .options = {
+ UART_ROUTING_UART1,
+ UART_ROUTING_UART2,
+ UART_ROUTING_UART3,
+ UART_ROUTING_UART4,
+ UART_ROUTING_UART10,
+ UART_ROUTING_IO3,
+ UART_ROUTING_IO4,
+ UART_ROUTING_IO10,
+ NULL,
+ },
+};
+
+static struct attribute *ast2600_uart_routing_attrs[] = {
+ &ast2600_uart10_sel.dev_attr.attr,
+ &ast2600_io10_sel.dev_attr.attr,
+ &ast2600_uart4_sel.dev_attr.attr,
+ &ast2600_uart3_sel.dev_attr.attr,
+ &ast2600_uart2_sel.dev_attr.attr,
+ &ast2600_uart1_sel.dev_attr.attr,
+ &ast2600_io4_sel.dev_attr.attr,
+ &ast2600_io3_sel.dev_attr.attr,
+ &ast2600_io2_sel.dev_attr.attr,
+ &ast2600_io1_sel.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ast2600_uart_routing_attr_group = {
+ .attrs = ast2600_uart_routing_attrs,
+};
+
+static ssize_t aspeed_uart_routing_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct aspeed_uart_routing *uart_routing = dev_get_drvdata(dev);
+ struct aspeed_uart_routing_selector *sel = to_routing_selector(attr);
+ int val, pos, len;
+
+ regmap_read(uart_routing->map, sel->reg, &val);
+ val = (val >> sel->shift) & sel->mask;
+
+ len = 0;
+ for (pos = 0; sel->options[pos] != NULL; ++pos) {
+ if (pos == val)
+ len += sysfs_emit_at(buf, len, "[%s] ", sel->options[pos]);
+ else
+ len += sysfs_emit_at(buf, len, "%s ", sel->options[pos]);
+ }
+
+ if (val >= pos)
+ len += sysfs_emit_at(buf, len, "[unknown(%d)]", val);
+
+ len += sysfs_emit_at(buf, len, "\n");
+
+ return len;
+}
+
+static ssize_t aspeed_uart_routing_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct aspeed_uart_routing *uart_routing = dev_get_drvdata(dev);
+ struct aspeed_uart_routing_selector *sel = to_routing_selector(attr);
+ int val;
+
+ val = match_string(sel->options, -1, buf);
+ if (val < 0) {
+ dev_err(dev, "invalid value \"%s\"\n", buf);
+ return -EINVAL;
+ }
+
+ regmap_update_bits(uart_routing->map, sel->reg,
+ (sel->mask << sel->shift),
+ (val & sel->mask) << sel->shift);
+
+ return count;
+}
+
+static int aspeed_uart_routing_probe(struct platform_device *pdev)
+{
+ int rc;
+ struct device *dev = &pdev->dev;
+ struct aspeed_uart_routing *uart_routing;
+
+ uart_routing = devm_kzalloc(&pdev->dev, sizeof(*uart_routing), GFP_KERNEL);
+ if (!uart_routing)
+ return -ENOMEM;
+
+ uart_routing->map = syscon_node_to_regmap(dev->parent->of_node);
+ if (IS_ERR(uart_routing->map)) {
+ dev_err(dev, "cannot get regmap\n");
+ return PTR_ERR(uart_routing->map);
+ }
+
+ uart_routing->attr_grp = of_device_get_match_data(dev);
+
+ rc = sysfs_create_group(&dev->kobj, uart_routing->attr_grp);
+ if (rc < 0)
+ return rc;
+
+ dev_set_drvdata(dev, uart_routing);
+
+ dev_info(dev, "module loaded\n");
+
+ return 0;
+}
+
+static int aspeed_uart_routing_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct aspeed_uart_routing *uart_routing = platform_get_drvdata(pdev);
+
+ sysfs_remove_group(&dev->kobj, uart_routing->attr_grp);
+
+ return 0;
+}
+
+static const struct of_device_id aspeed_uart_routing_table[] = {
+ { .compatible = "aspeed,ast2400-uart-routing",
+ .data = &ast2500_uart_routing_attr_group },
+ { .compatible = "aspeed,ast2500-uart-routing",
+ .data = &ast2500_uart_routing_attr_group },
+ { .compatible = "aspeed,ast2600-uart-routing",
+ .data = &ast2600_uart_routing_attr_group },
+ { },
+};
+
+static struct platform_driver aspeed_uart_routing_driver = {
+ .driver = {
+ .name = "aspeed-uart-routing",
+ .of_match_table = aspeed_uart_routing_table,
+ },
+ .probe = aspeed_uart_routing_probe,
+ .remove = aspeed_uart_routing_remove,
+};
+
+module_platform_driver(aspeed_uart_routing_driver);
+
+MODULE_AUTHOR("Oskar Senft <osk@google.com>");
+MODULE_AUTHOR("Chia-Wei Wang <chiawei_wang@aspeedtech.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Driver to configure Aspeed UART routing");
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