Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 357 insertions, 0 deletions

diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
new file mode 100644
index 000000000..1b461fba1
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -0,0 +1,357 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Serial Port driver for Open Firmware platform devices
+ *
+ *    Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>, IBM Corp.
+ */
+#include <linux/console.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+
+#include "8250.h"
+
+struct of_serial_info {
+	struct clk *clk;
+	struct reset_control *rst;
+	int type;
+	int line;
+};
+
+/*
+ * Fill a struct uart_port for a given device node
+ */
+static int of_platform_serial_setup(struct platform_device *ofdev,
+			int type, struct uart_8250_port *up,
+			struct of_serial_info *info)
+{
+	struct resource resource;
+	struct device_node *np = ofdev->dev.of_node;
+	struct uart_port *port = &up->port;
+	u32 clk, spd, prop;
+	int ret, irq;
+
+	memset(port, 0, sizeof *port);
+
+	pm_runtime_enable(&ofdev->dev);
+	pm_runtime_get_sync(&ofdev->dev);
+
+	if (of_property_read_u32(np, "clock-frequency", &clk)) {
+
+		/* Get clk rate through clk driver if present */
+		info->clk = devm_clk_get(&ofdev->dev, NULL);
+		if (IS_ERR(info->clk)) {
+			ret = PTR_ERR(info->clk);
+			if (ret != -EPROBE_DEFER)
+				dev_warn(&ofdev->dev,
+					 "failed to get clock: %d\n", ret);
+			goto err_pmruntime;
+		}
+
+		ret = clk_prepare_enable(info->clk);
+		if (ret < 0)
+			goto err_pmruntime;
+
+		clk = clk_get_rate(info->clk);
+	}
+	/* If current-speed was set, then try not to change it. */
+	if (of_property_read_u32(np, "current-speed", &spd) == 0)
+		port->custom_divisor = clk / (16 * spd);
+
+	ret = of_address_to_resource(np, 0, &resource);
+	if (ret) {
+		dev_warn(&ofdev->dev, "invalid address\n");
+		goto err_unprepare;
+	}
+
+	port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT |
+				  UPF_FIXED_TYPE;
+	spin_lock_init(&port->lock);
+
+	if (resource_type(&resource) == IORESOURCE_IO) {
+		port->iotype = UPIO_PORT;
+		port->iobase = resource.start;
+	} else {
+		port->mapbase = resource.start;
+		port->mapsize = resource_size(&resource);
+
+		/* Check for shifted address mapping */
+		if (of_property_read_u32(np, "reg-offset", &prop) == 0) {
+			if (prop >= port->mapsize) {
+				dev_warn(&ofdev->dev, "reg-offset %u exceeds region size %pa\n",
+					 prop, &port->mapsize);
+				ret = -EINVAL;
+				goto err_unprepare;
+			}
+
+			port->mapbase += prop;
+			port->mapsize -= prop;
+		}
+
+		port->iotype = UPIO_MEM;
+		if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
+			switch (prop) {
+			case 1:
+				port->iotype = UPIO_MEM;
+				break;
+			case 2:
+				port->iotype = UPIO_MEM16;
+				break;
+			case 4:
+				port->iotype = of_device_is_big_endian(np) ?
+					       UPIO_MEM32BE : UPIO_MEM32;
+				break;
+			default:
+				dev_warn(&ofdev->dev, "unsupported reg-io-width (%d)\n",
+					 prop);
+				ret = -EINVAL;
+				goto err_unprepare;
+			}
+		}
+		port->flags |= UPF_IOREMAP;
+	}
+
+	/* Compatibility with the deprecated pxa driver and 8250_pxa drivers. */
+	if (of_device_is_compatible(np, "mrvl,mmp-uart"))
+		port->regshift = 2;
+
+	/* Check for registers offset within the devices address range */
+	if (of_property_read_u32(np, "reg-shift", &prop) == 0)
+		port->regshift = prop;
+
+	/* Check for fifo size */
+	if (of_property_read_u32(np, "fifo-size", &prop) == 0)
+		port->fifosize = prop;
+
+	/* Check for a fixed line number */
+	ret = of_alias_get_id(np, "serial");
+	if (ret >= 0)
+		port->line = ret;
+
+	irq = of_irq_get(np, 0);
+	if (irq < 0) {
+		if (irq == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			goto err_unprepare;
+		}
+		/* IRQ support not mandatory */
+		irq = 0;
+	}
+
+	port->irq = irq;
+
+	info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);
+	if (IS_ERR(info->rst)) {
+		ret = PTR_ERR(info->rst);
+		goto err_unprepare;
+	}
+
+	ret = reset_control_deassert(info->rst);
+	if (ret)
+		goto err_unprepare;
+
+	port->type = type;
+	port->uartclk = clk;
+
+	if (of_property_read_bool(np, "no-loopback-test"))
+		port->flags |= UPF_SKIP_TEST;
+
+	port->dev = &ofdev->dev;
+	port->rs485_config = serial8250_em485_config;
+	port->rs485_supported = serial8250_em485_supported;
+	up->rs485_start_tx = serial8250_em485_start_tx;
+	up->rs485_stop_tx = serial8250_em485_stop_tx;
+
+	switch (type) {
+	case PORT_RT2880:
+		port->iotype = UPIO_AU;
+		break;
+	}
+
+	if (IS_ENABLED(CONFIG_SERIAL_8250_FSL) &&
+	    (of_device_is_compatible(np, "fsl,ns16550") ||
+	     of_device_is_compatible(np, "fsl,16550-FIFO64"))) {
+		port->handle_irq = fsl8250_handle_irq;
+		port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);
+	}
+
+	return 0;
+err_unprepare:
+	clk_disable_unprepare(info->clk);
+err_pmruntime:
+	pm_runtime_put_sync(&ofdev->dev);
+	pm_runtime_disable(&ofdev->dev);
+	return ret;
+}
+
+/*
+ * Try to register a serial port
+ */
+static int of_platform_serial_probe(struct platform_device *ofdev)
+{
+	struct of_serial_info *info;
+	struct uart_8250_port port8250;
+	unsigned int port_type;
+	u32 tx_threshold;
+	int ret;
+
+	if (IS_ENABLED(CONFIG_SERIAL_8250_BCM7271) &&
+	    of_device_is_compatible(ofdev->dev.of_node, "brcm,bcm7271-uart"))
+		return -ENODEV;
+
+	port_type = (unsigned long)of_device_get_match_data(&ofdev->dev);
+	if (port_type == PORT_UNKNOWN)
+		return -EINVAL;
+
+	if (of_property_read_bool(ofdev->dev.of_node, "used-by-rtas"))
+		return -EBUSY;
+
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	if (info == NULL)
+		return -ENOMEM;
+
+	memset(&port8250, 0, sizeof(port8250));
+	ret = of_platform_serial_setup(ofdev, port_type, &port8250, info);
+	if (ret)
+		goto err_free;
+
+	if (port8250.port.fifosize)
+		port8250.capabilities = UART_CAP_FIFO;
+
+	/* Check for TX FIFO threshold & set tx_loadsz */
+	if ((of_property_read_u32(ofdev->dev.of_node, "tx-threshold",
+				  &tx_threshold) == 0) &&
+	    (tx_threshold < port8250.port.fifosize))
+		port8250.tx_loadsz = port8250.port.fifosize - tx_threshold;
+
+	if (of_property_read_bool(ofdev->dev.of_node, "auto-flow-control"))
+		port8250.capabilities |= UART_CAP_AFE;
+
+	if (of_property_read_u32(ofdev->dev.of_node,
+			"overrun-throttle-ms",
+			&port8250.overrun_backoff_time_ms) != 0)
+		port8250.overrun_backoff_time_ms = 0;
+
+	ret = serial8250_register_8250_port(&port8250);
+	if (ret < 0)
+		goto err_dispose;
+
+	info->type = port_type;
+	info->line = ret;
+	platform_set_drvdata(ofdev, info);
+	return 0;
+err_dispose:
+	irq_dispose_mapping(port8250.port.irq);
+	pm_runtime_put_sync(&ofdev->dev);
+	pm_runtime_disable(&ofdev->dev);
+	clk_disable_unprepare(info->clk);
+err_free:
+	kfree(info);
+	return ret;
+}
+
+/*
+ * Release a line
+ */
+static int of_platform_serial_remove(struct platform_device *ofdev)
+{
+	struct of_serial_info *info = platform_get_drvdata(ofdev);
+
+	serial8250_unregister_port(info->line);
+
+	reset_control_assert(info->rst);
+	pm_runtime_put_sync(&ofdev->dev);
+	pm_runtime_disable(&ofdev->dev);
+	clk_disable_unprepare(info->clk);
+	kfree(info);
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int of_serial_suspend(struct device *dev)
+{
+	struct of_serial_info *info = dev_get_drvdata(dev);
+	struct uart_8250_port *port8250 = serial8250_get_port(info->line);
+	struct uart_port *port = &port8250->port;
+
+	serial8250_suspend_port(info->line);
+
+	if (!uart_console(port) || console_suspend_enabled) {
+		pm_runtime_put_sync(dev);
+		clk_disable_unprepare(info->clk);
+	}
+	return 0;
+}
+
+static int of_serial_resume(struct device *dev)
+{
+	struct of_serial_info *info = dev_get_drvdata(dev);
+	struct uart_8250_port *port8250 = serial8250_get_port(info->line);
+	struct uart_port *port = &port8250->port;
+
+	if (!uart_console(port) || console_suspend_enabled) {
+		pm_runtime_get_sync(dev);
+		clk_prepare_enable(info->clk);
+	}
+
+	serial8250_resume_port(info->line);
+
+	return 0;
+}
+#endif
+static SIMPLE_DEV_PM_OPS(of_serial_pm_ops, of_serial_suspend, of_serial_resume);
+
+/*
+ * A few common types, add more as needed.
+ */
+static const struct of_device_id of_platform_serial_table[] = {
+	{ .compatible = "ns8250",   .data = (void *)PORT_8250, },
+	{ .compatible = "ns16450",  .data = (void *)PORT_16450, },
+	{ .compatible = "ns16550a", .data = (void *)PORT_16550A, },
+	{ .compatible = "ns16550",  .data = (void *)PORT_16550, },
+	{ .compatible = "ns16750",  .data = (void *)PORT_16750, },
+	{ .compatible = "ns16850",  .data = (void *)PORT_16850, },
+	{ .compatible = "nxp,lpc3220-uart", .data = (void *)PORT_LPC3220, },
+	{ .compatible = "ralink,rt2880-uart", .data = (void *)PORT_RT2880, },
+	{ .compatible = "intel,xscale-uart", .data = (void *)PORT_XSCALE, },
+	{ .compatible = "altr,16550-FIFO32",
+		.data = (void *)PORT_ALTR_16550_F32, },
+	{ .compatible = "altr,16550-FIFO64",
+		.data = (void *)PORT_ALTR_16550_F64, },
+	{ .compatible = "altr,16550-FIFO128",
+		.data = (void *)PORT_ALTR_16550_F128, },
+	{ .compatible = "fsl,16550-FIFO64",
+		.data = (void *)PORT_16550A_FSL64, },
+	{ .compatible = "mediatek,mtk-btif",
+		.data = (void *)PORT_MTK_BTIF, },
+	{ .compatible = "mrvl,mmp-uart",
+		.data = (void *)PORT_XSCALE, },
+	{ .compatible = "ti,da830-uart", .data = (void *)PORT_DA830, },
+	{ .compatible = "nuvoton,wpcm450-uart", .data = (void *)PORT_NPCM, },
+	{ .compatible = "nuvoton,npcm750-uart", .data = (void *)PORT_NPCM, },
+	{ /* end of list */ },
+};
+MODULE_DEVICE_TABLE(of, of_platform_serial_table);
+
+static struct platform_driver of_platform_serial_driver = {
+	.driver = {
+		.name = "of_serial",
+		.of_match_table = of_platform_serial_table,
+		.pm = &of_serial_pm_ops,
+	},
+	.probe = of_platform_serial_probe,
+	.remove = of_platform_serial_remove,
+};
+
+module_platform_driver(of_platform_serial_driver);
+
+MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Serial Port driver for Open Firmware platform devices");