/*
* uartlite.c: Serial driver for Xilinx uartlite serial controller
*
- * Peter Korsgaard <jacmet@sunsite.dk>
+ * Copyright (C) 2006 Peter Korsgaard <jacmet@sunsite.dk>
+ * Copyright (C) 2007 Secret Lab Technologies Ltd.
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <asm/io.h>
+#if defined(CONFIG_OF)
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#endif
#define ULITE_NAME "ttyUL"
#define ULITE_MAJOR 204
#define ULITE_MINOR 187
#define ULITE_NR_UARTS 4
-/* For register details see datasheet:
- http://www.xilinx.com/bvdocs/ipcenter/data_sheet/opb_uartlite.pdf
-*/
+/* ---------------------------------------------------------------------
+ * Register definitions
+ *
+ * For register details see datasheet:
+ * http://www.xilinx.com/bvdocs/ipcenter/data_sheet/opb_uartlite.pdf
+ */
+
#define ULITE_RX 0x00
#define ULITE_TX 0x04
#define ULITE_STATUS 0x08
static struct uart_port ulite_ports[ULITE_NR_UARTS];
+/* ---------------------------------------------------------------------
+ * Core UART driver operations
+ */
+
static int ulite_receive(struct uart_port *port, int stat)
{
struct tty_struct *tty = port->info->tty;
/* stats */
if (stat & ULITE_STATUS_RXVALID) {
port->icount.rx++;
- ch = in_be32((void*)port->membase + ULITE_RX);
+ ch = readb(port->membase + ULITE_RX);
if (stat & ULITE_STATUS_PARITY)
port->icount.parity++;
return 0;
if (port->x_char) {
- out_be32((void*)port->membase + ULITE_TX, port->x_char);
+ writeb(port->x_char, port->membase + ULITE_TX);
port->x_char = 0;
port->icount.tx++;
return 1;
if (uart_circ_empty(xmit) || uart_tx_stopped(port))
return 0;
- out_be32((void*)port->membase + ULITE_TX, xmit->buf[xmit->tail]);
+ writeb(xmit->buf[xmit->tail], port->membase + ULITE_TX);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1);
port->icount.tx++;
int busy;
do {
- int stat = in_be32((void*)port->membase + ULITE_STATUS);
+ int stat = readb(port->membase + ULITE_STATUS);
busy = ulite_receive(port, stat);
busy |= ulite_transmit(port, stat);
} while (busy);
unsigned int ret;
spin_lock_irqsave(&port->lock, flags);
- ret = in_be32((void*)port->membase + ULITE_STATUS);
+ ret = readb(port->membase + ULITE_STATUS);
spin_unlock_irqrestore(&port->lock, flags);
return ret & ULITE_STATUS_TXEMPTY ? TIOCSER_TEMT : 0;
static void ulite_start_tx(struct uart_port *port)
{
- ulite_transmit(port, in_be32((void*)port->membase + ULITE_STATUS));
+ ulite_transmit(port, readb(port->membase + ULITE_STATUS));
}
static void ulite_stop_rx(struct uart_port *port)
if (ret)
return ret;
- out_be32((void*)port->membase + ULITE_CONTROL,
- ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
- out_be32((void*)port->membase + ULITE_CONTROL, ULITE_CONTROL_IE);
+ writeb(ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX,
+ port->membase + ULITE_CONTROL);
+ writeb(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
return 0;
}
static void ulite_shutdown(struct uart_port *port)
{
- out_be32((void*)port->membase + ULITE_CONTROL, 0);
- in_be32((void*)port->membase + ULITE_CONTROL); /* dummy */
+ writeb(0, port->membase + ULITE_CONTROL);
+ readb(port->membase + ULITE_CONTROL); /* dummy */
free_irq(port->irq, port);
}
.verify_port = ulite_verify_port
};
+/* ---------------------------------------------------------------------
+ * Console driver operations
+ */
+
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
static void ulite_console_wait_tx(struct uart_port *port)
{
int i;
+ u8 val;
- /* wait up to 10ms for the character(s) to be sent */
- for (i = 0; i < 10000; i++) {
- if (in_be32((void*)port->membase + ULITE_STATUS) & ULITE_STATUS_TXEMPTY)
+ /* Spin waiting for TX fifo to have space available */
+ for (i = 0; i < 100000; i++) {
+ val = readb(port->membase + ULITE_STATUS);
+ if ((val & ULITE_STATUS_TXFULL) == 0)
break;
- udelay(1);
+ cpu_relax();
}
}
static void ulite_console_putchar(struct uart_port *port, int ch)
{
ulite_console_wait_tx(port);
- out_be32((void*)port->membase + ULITE_TX, ch);
+ writeb(ch, port->membase + ULITE_TX);
}
static void ulite_console_write(struct console *co, const char *s,
spin_lock_irqsave(&port->lock, flags);
/* save and disable interrupt */
- ier = in_be32((void*)port->membase + ULITE_STATUS) & ULITE_STATUS_IE;
- out_be32((void*)port->membase + ULITE_CONTROL, 0);
+ ier = readb(port->membase + ULITE_STATUS) & ULITE_STATUS_IE;
+ writeb(0, port->membase + ULITE_CONTROL);
uart_console_write(port, s, count, ulite_console_putchar);
/* restore interrupt state */
if (ier)
- out_be32((void*)port->membase + ULITE_CONTROL, ULITE_CONTROL_IE);
+ writeb(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
if (locked)
spin_unlock_irqrestore(&port->lock, flags);
}
+#if defined(CONFIG_OF)
+static inline void __init ulite_console_of_find_device(int id)
+{
+ struct device_node *np;
+ struct resource res;
+ const unsigned int *of_id;
+ int rc;
+
+ for_each_compatible_node(np, NULL, "xilinx,uartlite") {
+ of_id = of_get_property(np, "port-number", NULL);
+ if ((!of_id) || (*of_id != id))
+ continue;
+
+ rc = of_address_to_resource(np, 0, &res);
+ if (rc)
+ continue;
+
+ ulite_ports[id].mapbase = res.start;
+ return;
+ }
+}
+#else /* CONFIG_OF */
+static inline void __init ulite_console_of_find_device(int id) { /* do nothing */ }
+#endif /* CONFIG_OF */
+
static int __init ulite_console_setup(struct console *co, char *options)
{
struct uart_port *port;
port = &ulite_ports[co->index];
- /* not initialized yet? */
- if (!port->membase)
+ /* Check if it is an OF device */
+ if (!port->mapbase)
+ ulite_console_of_find_device(co->index);
+
+ /* Do we have a device now? */
+ if (!port->mapbase) {
+ pr_debug("console on ttyUL%i not present\n", co->index);
return -ENODEV;
+ }
+
+ /* not initialized yet? */
+ if (!port->membase) {
+ if (ulite_request_port(port))
+ return -ENODEV;
+ }
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
#endif
};
+/* ---------------------------------------------------------------------
+ * Port assignment functions (mapping devices to uart_port structures)
+ */
+
+/** ulite_assign: register a uartlite device with the driver
+ *
+ * @dev: pointer to device structure
+ * @id: requested id number. Pass -1 for automatic port assignment
+ * @base: base address of uartlite registers
+ * @irq: irq number for uartlite
+ *
+ * Returns: 0 on success, <0 otherwise
+ */
static int __devinit ulite_assign(struct device *dev, int id, u32 base, int irq)
{
struct uart_port *port;
return -EINVAL;
}
- if (ulite_ports[id].mapbase) {
+ if ((ulite_ports[id].mapbase) && (ulite_ports[id].mapbase != base)) {
dev_err(dev, "cannot assign to %s%i; it is already in use\n",
ULITE_NAME, id);
return -EBUSY;
return 0;
}
+/** ulite_release: register a uartlite device with the driver
+ *
+ * @dev: pointer to device structure
+ */
static int __devinit ulite_release(struct device *dev)
{
struct uart_port *port = dev_get_drvdata(dev);
return rc;
}
+/* ---------------------------------------------------------------------
+ * Platform bus binding
+ */
+
static int __devinit ulite_probe(struct platform_device *pdev)
{
struct resource *res, *res2;
},
};
+/* ---------------------------------------------------------------------
+ * OF bus bindings
+ */
+#if defined(CONFIG_OF)
+static int __devinit
+ulite_of_probe(struct of_device *op, const struct of_device_id *match)
+{
+ struct resource res;
+ const unsigned int *id;
+ int irq, rc;
+
+ dev_dbg(&op->dev, "%s(%p, %p)\n", __FUNCTION__, op, match);
+
+ rc = of_address_to_resource(op->node, 0, &res);
+ if (rc) {
+ dev_err(&op->dev, "invalid address\n");
+ return rc;
+ }
+
+ irq = irq_of_parse_and_map(op->node, 0);
+
+ id = of_get_property(op->node, "port-number", NULL);
+
+ return ulite_assign(&op->dev, id ? *id : -1, res.start+3, irq);
+}
+
+static int __devexit ulite_of_remove(struct of_device *op)
+{
+ return ulite_release(&op->dev);
+}
+
+/* Match table for of_platform binding */
+static struct of_device_id __devinit ulite_of_match[] = {
+ { .type = "serial", .compatible = "xilinx,uartlite", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ulite_of_match);
+
+static struct of_platform_driver ulite_of_driver = {
+ .owner = THIS_MODULE,
+ .name = "uartlite",
+ .match_table = ulite_of_match,
+ .probe = ulite_of_probe,
+ .remove = __devexit_p(ulite_of_remove),
+ .driver = {
+ .name = "uartlite",
+ },
+};
+
+/* Registration helpers to keep the number of #ifdefs to a minimum */
+static inline int __init ulite_of_register(void)
+{
+ pr_debug("uartlite: calling of_register_platform_driver()\n");
+ return of_register_platform_driver(&ulite_of_driver);
+}
+
+static inline void __exit ulite_of_unregister(void)
+{
+ of_unregister_platform_driver(&ulite_of_driver);
+}
+#else /* CONFIG_OF */
+/* CONFIG_OF not enabled; do nothing helpers */
+static inline int __init ulite_of_register(void) { return 0; }
+static inline void __exit ulite_of_unregister(void) { }
+#endif /* CONFIG_OF */
+
+/* ---------------------------------------------------------------------
+ * Module setup/teardown
+ */
+
int __init ulite_init(void)
{
int ret;
+ pr_debug("uartlite: calling uart_register_driver()\n");
ret = uart_register_driver(&ulite_uart_driver);
if (ret)
- return ret;
+ goto err_uart;
+
+ ret = ulite_of_register();
+ if (ret)
+ goto err_of;
+ pr_debug("uartlite: calling platform_driver_register()\n");
ret = platform_driver_register(&ulite_platform_driver);
if (ret)
- uart_unregister_driver(&ulite_uart_driver);
+ goto err_plat;
+ return 0;
+
+err_plat:
+ ulite_of_unregister();
+err_of:
+ uart_unregister_driver(&ulite_uart_driver);
+err_uart:
+ printk(KERN_ERR "registering uartlite driver failed: err=%i", ret);
return ret;
}
void __exit ulite_exit(void)
{
platform_driver_unregister(&ulite_platform_driver);
+ ulite_of_unregister();
uart_unregister_driver(&ulite_uart_driver);
}
projects / linux-2.6-omap-h63xx.git / blobdiff