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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/tty/serial/of_serial.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/tty/serial/of_serial.c')
-rw-r--r--kernel/drivers/tty/serial/of_serial.c365
1 files changed, 365 insertions, 0 deletions
diff --git a/kernel/drivers/tty/serial/of_serial.c b/kernel/drivers/tty/serial/of_serial.c
new file mode 100644
index 000000000..137381e64
--- /dev/null
+++ b/kernel/drivers/tty/serial/of_serial.c
@@ -0,0 +1,365 @@
+/*
+ * Serial Port driver for Open Firmware platform devices
+ *
+ * Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>, IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+#include <linux/console.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.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/nwpserial.h>
+#include <linux/clk.h>
+
+#include "8250/8250.h"
+
+struct of_serial_info {
+ struct clk *clk;
+ int type;
+ int line;
+};
+
+#ifdef CONFIG_ARCH_TEGRA
+void tegra_serial_handle_break(struct uart_port *p)
+{
+ unsigned int status, tmout = 10000;
+
+ do {
+ status = p->serial_in(p, UART_LSR);
+ if (status & (UART_LSR_FIFOE | UART_LSR_BRK_ERROR_BITS))
+ status = p->serial_in(p, UART_RX);
+ else
+ break;
+ if (--tmout == 0)
+ break;
+ udelay(1);
+ } while (1);
+}
+#else
+static inline void tegra_serial_handle_break(struct uart_port *port)
+{
+}
+#endif
+
+/*
+ * Fill a struct uart_port for a given device node
+ */
+static int of_platform_serial_setup(struct platform_device *ofdev,
+ int type, struct uart_port *port,
+ struct of_serial_info *info)
+{
+ struct resource resource;
+ struct device_node *np = ofdev->dev.of_node;
+ u32 clk, spd, prop;
+ int ret;
+
+ memset(port, 0, sizeof *port);
+ if (of_property_read_u32(np, "clock-frequency", &clk)) {
+
+ /* Get clk rate through clk driver if present */
+ info->clk = clk_get(&ofdev->dev, NULL);
+ if (IS_ERR(info->clk)) {
+ dev_warn(&ofdev->dev,
+ "clk or clock-frequency not defined\n");
+ return PTR_ERR(info->clk);
+ }
+
+ clk_prepare_enable(info->clk);
+ 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 out;
+ }
+
+ spin_lock_init(&port->lock);
+ port->mapbase = resource.start;
+ port->mapsize = resource_size(&resource);
+
+ /* Check for shifted address mapping */
+ if (of_property_read_u32(np, "reg-offset", &prop) == 0)
+ port->mapbase += prop;
+
+ /* 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;
+
+ port->irq = irq_of_parse_and_map(np, 0);
+ 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 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 out;
+ }
+ }
+
+ port->type = type;
+ port->uartclk = clk;
+ port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP
+ | UPF_FIXED_PORT | UPF_FIXED_TYPE;
+
+ if (of_find_property(np, "no-loopback-test", NULL))
+ port->flags |= UPF_SKIP_TEST;
+
+ port->dev = &ofdev->dev;
+
+ switch (type) {
+ case PORT_TEGRA:
+ port->handle_break = tegra_serial_handle_break;
+ break;
+
+ case PORT_RT2880:
+ port->iotype = UPIO_AU;
+ break;
+ }
+
+ return 0;
+out:
+ if (info->clk)
+ clk_disable_unprepare(info->clk);
+ return ret;
+}
+
+/*
+ * Try to register a serial port
+ */
+static const struct of_device_id of_platform_serial_table[];
+static int of_platform_serial_probe(struct platform_device *ofdev)
+{
+ const struct of_device_id *match;
+ struct of_serial_info *info;
+ struct uart_port port;
+ int port_type;
+ int ret;
+
+ match = of_match_device(of_platform_serial_table, &ofdev->dev);
+ if (!match)
+ return -EINVAL;
+
+ if (of_find_property(ofdev->dev.of_node, "used-by-rtas", NULL))
+ return -EBUSY;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (info == NULL)
+ return -ENOMEM;
+
+ port_type = (unsigned long)match->data;
+ ret = of_platform_serial_setup(ofdev, port_type, &port, info);
+ if (ret)
+ goto out;
+
+ switch (port_type) {
+#ifdef CONFIG_SERIAL_8250
+ case PORT_8250 ... PORT_MAX_8250:
+ {
+ struct uart_8250_port port8250;
+ memset(&port8250, 0, sizeof(port8250));
+ port.type = port_type;
+ port8250.port = port;
+
+ if (port.fifosize)
+ port8250.capabilities = UART_CAP_FIFO;
+
+ if (of_property_read_bool(ofdev->dev.of_node,
+ "auto-flow-control"))
+ port8250.capabilities |= UART_CAP_AFE;
+
+ ret = serial8250_register_8250_port(&port8250);
+ break;
+ }
+#endif
+#ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL
+ case PORT_NWPSERIAL:
+ ret = nwpserial_register_port(&port);
+ break;
+#endif
+ default:
+ /* need to add code for these */
+ case PORT_UNKNOWN:
+ dev_info(&ofdev->dev, "Unknown serial port found, ignored\n");
+ ret = -ENODEV;
+ break;
+ }
+ if (ret < 0)
+ goto out;
+
+ info->type = port_type;
+ info->line = ret;
+ platform_set_drvdata(ofdev, info);
+ return 0;
+out:
+ kfree(info);
+ irq_dispose_mapping(port.irq);
+ return ret;
+}
+
+/*
+ * Release a line
+ */
+static int of_platform_serial_remove(struct platform_device *ofdev)
+{
+ struct of_serial_info *info = platform_get_drvdata(ofdev);
+ switch (info->type) {
+#ifdef CONFIG_SERIAL_8250
+ case PORT_8250 ... PORT_MAX_8250:
+ serial8250_unregister_port(info->line);
+ break;
+#endif
+#ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL
+ case PORT_NWPSERIAL:
+ nwpserial_unregister_port(info->line);
+ break;
+#endif
+ default:
+ /* need to add code for these */
+ break;
+ }
+
+ if (info->clk)
+ clk_disable_unprepare(info->clk);
+ kfree(info);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_SERIAL_8250
+static void of_serial_suspend_8250(struct of_serial_info *info)
+{
+ struct uart_8250_port *port8250 = serial8250_get_port(info->line);
+ struct uart_port *port = &port8250->port;
+
+ serial8250_suspend_port(info->line);
+ if (info->clk && (!uart_console(port) || console_suspend_enabled))
+ clk_disable_unprepare(info->clk);
+}
+
+static void of_serial_resume_8250(struct of_serial_info *info)
+{
+ struct uart_8250_port *port8250 = serial8250_get_port(info->line);
+ struct uart_port *port = &port8250->port;
+
+ if (info->clk && (!uart_console(port) || console_suspend_enabled))
+ clk_prepare_enable(info->clk);
+
+ serial8250_resume_port(info->line);
+}
+#else
+static inline void of_serial_suspend_8250(struct of_serial_info *info)
+{
+}
+
+static inline void of_serial_resume_8250(struct of_serial_info *info)
+{
+}
+#endif
+
+static int of_serial_suspend(struct device *dev)
+{
+ struct of_serial_info *info = dev_get_drvdata(dev);
+
+ switch (info->type) {
+ case PORT_8250 ... PORT_MAX_8250:
+ of_serial_suspend_8250(info);
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int of_serial_resume(struct device *dev)
+{
+ struct of_serial_info *info = dev_get_drvdata(dev);
+
+ switch (info->type) {
+ case PORT_8250 ... PORT_MAX_8250:
+ of_serial_resume_8250(info);
+ break;
+ default:
+ break;
+ }
+
+ 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 = "nvidia,tegra20-uart", .data = (void *)PORT_TEGRA, },
+ { .compatible = "nxp,lpc3220-uart", .data = (void *)PORT_LPC3220, },
+ { .compatible = "ralink,rt2880-uart", .data = (void *)PORT_RT2880, },
+ { .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 = "mrvl,mmp-uart",
+ .data = (void *)PORT_XSCALE, },
+ { .compatible = "mrvl,pxa-uart",
+ .data = (void *)PORT_XSCALE, },
+#ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL
+ { .compatible = "ibm,qpace-nwp-serial",
+ .data = (void *)PORT_NWPSERIAL, },
+#endif
+ { /* end of list */ },
+};
+
+static struct platform_driver of_platform_serial_driver = {
+ .driver = {
+ .name = "of_serial",
+ .of_match_table = of_platform_serial_table,
+ },
+ .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");