/*
* 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/tty.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
+#include <linux/init.h>
#include <asm/io.h>
+#if defined(CONFIG_OF) && (defined(CONFIG_PPC32) || defined(CONFIG_MICROBLAZE))
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+
+/* Match table for of_platform binding */
+static struct of_device_id ulite_of_match[] __devinitdata = {
+ { .compatible = "xlnx,opb-uartlite-1.00.b", },
+ { .compatible = "xlnx,xps-uartlite-1.00.a", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, ulite_of_match);
+
+#endif
#define ULITE_NAME "ttyUL"
#define ULITE_MAJOR 204
static int ulite_receive(struct uart_port *port, int stat)
{
- struct tty_struct *tty = port->info->tty;
+ struct tty_struct *tty = port->state->port.tty;
unsigned char ch = 0;
char flag = TTY_NORMAL;
/* 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++;
static int ulite_transmit(struct uart_port *port, int stat)
{
- struct circ_buf *xmit = &port->info->xmit;
+ struct circ_buf *xmit = &port->state->xmit;
if (stat & ULITE_STATUS_TXFULL)
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++;
static irqreturn_t ulite_isr(int irq, void *dev_id)
{
- struct uart_port *port = (struct uart_port *)dev_id;
- int busy;
+ struct uart_port *port = dev_id;
+ int busy, n = 0;
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);
+ n++;
} while (busy);
- tty_flip_buffer_push(port->info->tty);
-
- return IRQ_HANDLED;
+ /* work done? */
+ if (n > 1) {
+ tty_flip_buffer_push(port->state->port.tty);
+ return IRQ_HANDLED;
+ } else {
+ return IRQ_NONE;
+ }
}
static unsigned int ulite_tx_empty(struct uart_port *port)
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)
int ret;
ret = request_irq(port->irq, ulite_isr,
- IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "uartlite", port);
+ IRQF_SHARED | IRQF_SAMPLE_RANDOM, "uartlite", 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);
}
static int ulite_request_port(struct uart_port *port)
{
+ pr_debug("ulite console: port=%p; port->mapbase=%llx\n",
+ port, (unsigned long long) port->mapbase);
+
if (!request_mem_region(port->mapbase, ULITE_REGION, "uartlite")) {
dev_err(port->dev, "Memory region busy\n");
return -EBUSY;
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);
}
-static int __init ulite_console_setup(struct console *co, char *options)
+static int __devinit ulite_console_setup(struct console *co, char *options)
{
struct uart_port *port;
int baud = 9600;
port = &ulite_ports[co->index];
- /* not initialized yet? */
- if (!port->membase)
+ /* Has the device been initialized yet? */
+ 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);
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;
*
* @dev: pointer to device structure
*/
-static int __devinit ulite_release(struct device *dev)
+static int __devexit ulite_release(struct device *dev)
{
struct uart_port *port = dev_get_drvdata(dev);
int rc = 0;
return ulite_assign(&pdev->dev, pdev->id, res->start, res2->start);
}
-static int ulite_remove(struct platform_device *pdev)
+static int __devexit ulite_remove(struct platform_device *pdev)
{
return ulite_release(&pdev->dev);
}
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:uartlite");
+
static struct platform_driver ulite_platform_driver = {
.probe = ulite_probe,
- .remove = ulite_remove,
+ .remove = __devexit_p(ulite_remove),
.driver = {
.owner = THIS_MODULE,
.name = "uartlite",
};
/* ---------------------------------------------------------------------
+ * OF bus bindings
+ */
+#if defined(CONFIG_OF) && (defined(CONFIG_PPC32) || defined(CONFIG_MICROBLAZE))
+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", __func__, op, match);
+
+ rc = of_address_to_resource(op->dev.of_node, 0, &res);
+ if (rc) {
+ dev_err(&op->dev, "invalid address\n");
+ return rc;
+ }
+
+ irq = irq_of_parse_and_map(op->dev.of_node, 0);
+
+ id = of_get_property(op->dev.of_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);
+}
+
+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_PPC32 || CONFIG_MICROBLAZE) */
+/* Appropriate config 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 && (CONFIG_PPC32 || CONFIG_MICROBLAZE) */
+
+/* ---------------------------------------------------------------------
* Module setup/teardown
*/
{
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);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff