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authorGreg Kroah-Hartman <gregkh@suse.de>2011-01-13 12:10:18 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2011-01-13 12:10:18 -0800
commitab4382d27412e7e3e7c936e8d50d8888dfac3df8 (patch)
tree51d96dea2431140358784b6b426715f37f74fd53 /drivers/tty/serial/of_serial.c
parent728674a7e466628df2aeec6d11a2ae1ef968fb67 (diff)
tty: move drivers/serial/ to drivers/tty/serial/
The serial drivers are really just tty drivers, so move them to drivers/tty/ to make things a bit neater overall. This is part of the tty/serial driver movement proceedure as proposed by Arnd Bergmann and approved by everyone involved a number of months ago. Cc: Arnd Bergmann <arnd@arndb.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Rogier Wolff <R.E.Wolff@bitwizard.nl> Cc: Michael H. Warfield <mhw@wittsend.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/tty/serial/of_serial.c')
-rw-r--r--drivers/tty/serial/of_serial.c201
1 files changed, 201 insertions, 0 deletions
diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
new file mode 100644
index 000000000000..5c7abe4c94dd
--- /dev/null
+++ b/drivers/tty/serial/of_serial.c
@@ -0,0 +1,201 @@
+/*
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/serial_core.h>
+#include <linux/serial_8250.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/nwpserial.h>
+
+struct of_serial_info {
+ int type;
+ int line;
+};
+
+/*
+ * Fill a struct uart_port for a given device node
+ */
+static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
+ int type, struct uart_port *port)
+{
+ struct resource resource;
+ struct device_node *np = ofdev->dev.of_node;
+ const __be32 *clk, *spd;
+ const __be32 *prop;
+ int ret, prop_size;
+
+ memset(port, 0, sizeof *port);
+ spd = of_get_property(np, "current-speed", NULL);
+ clk = of_get_property(np, "clock-frequency", NULL);
+ if (!clk) {
+ dev_warn(&ofdev->dev, "no clock-frequency property set\n");
+ return -ENODEV;
+ }
+
+ ret = of_address_to_resource(np, 0, &resource);
+ if (ret) {
+ dev_warn(&ofdev->dev, "invalid address\n");
+ return ret;
+ }
+
+ spin_lock_init(&port->lock);
+ port->mapbase = resource.start;
+
+ /* Check for shifted address mapping */
+ prop = of_get_property(np, "reg-offset", &prop_size);
+ if (prop && (prop_size == sizeof(u32)))
+ port->mapbase += be32_to_cpup(prop);
+
+ /* Check for registers offset within the devices address range */
+ prop = of_get_property(np, "reg-shift", &prop_size);
+ if (prop && (prop_size == sizeof(u32)))
+ port->regshift = be32_to_cpup(prop);
+
+ port->irq = irq_of_parse_and_map(np, 0);
+ port->iotype = UPIO_MEM;
+ port->type = type;
+ port->uartclk = be32_to_cpup(clk);
+ port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP
+ | UPF_FIXED_PORT | UPF_FIXED_TYPE;
+ port->dev = &ofdev->dev;
+ /* If current-speed was set, then try not to change it. */
+ if (spd)
+ port->custom_divisor = be32_to_cpup(clk) / (16 * (be32_to_cpup(spd)));
+
+ return 0;
+}
+
+/*
+ * Try to register a serial port
+ */
+static int __devinit of_platform_serial_probe(struct platform_device *ofdev,
+ const struct of_device_id *id)
+{
+ struct of_serial_info *info;
+ struct uart_port port;
+ int port_type;
+ int ret;
+
+ if (of_find_property(ofdev->dev.of_node, "used-by-rtas", NULL))
+ return -EBUSY;
+
+ info = kmalloc(sizeof(*info), GFP_KERNEL);
+ if (info == NULL)
+ return -ENOMEM;
+
+ port_type = (unsigned long)id->data;
+ ret = of_platform_serial_setup(ofdev, port_type, &port);
+ if (ret)
+ goto out;
+
+ switch (port_type) {
+#ifdef CONFIG_SERIAL_8250
+ case PORT_8250 ... PORT_MAX_8250:
+ ret = serial8250_register_port(&port);
+ 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;
+ dev_set_drvdata(&ofdev->dev, 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 = dev_get_drvdata(&ofdev->dev);
+ 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;
+ }
+ kfree(info);
+ return 0;
+}
+
+/*
+ * A few common types, add more as needed.
+ */
+static struct of_device_id __devinitdata of_platform_serial_table[] = {
+ { .type = "serial", .compatible = "ns8250", .data = (void *)PORT_8250, },
+ { .type = "serial", .compatible = "ns16450", .data = (void *)PORT_16450, },
+ { .type = "serial", .compatible = "ns16550a", .data = (void *)PORT_16550A, },
+ { .type = "serial", .compatible = "ns16550", .data = (void *)PORT_16550, },
+ { .type = "serial", .compatible = "ns16750", .data = (void *)PORT_16750, },
+ { .type = "serial", .compatible = "ns16850", .data = (void *)PORT_16850, },
+#ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL
+ { .type = "serial", .compatible = "ibm,qpace-nwp-serial",
+ .data = (void *)PORT_NWPSERIAL, },
+#endif
+ { .type = "serial", .data = (void *)PORT_UNKNOWN, },
+ { /* end of list */ },
+};
+
+static struct of_platform_driver of_platform_serial_driver = {
+ .driver = {
+ .name = "of_serial",
+ .owner = THIS_MODULE,
+ .of_match_table = of_platform_serial_table,
+ },
+ .probe = of_platform_serial_probe,
+ .remove = of_platform_serial_remove,
+};
+
+static int __init of_platform_serial_init(void)
+{
+ return of_register_platform_driver(&of_platform_serial_driver);
+}
+module_init(of_platform_serial_init);
+
+static void __exit of_platform_serial_exit(void)
+{
+ return of_unregister_platform_driver(&of_platform_serial_driver);
+};
+module_exit(of_platform_serial_exit);
+
+MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Serial Port driver for Open Firmware platform devices");