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serial: vt8500: Add devicetree support for vt8500-serial 

Increase vt8500_max_ports to 6 as the WM8505 as 6 available uarts.
Use devicetree port id as primary addressing for ports but allow
auto-allocation if id not specified.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Acked-by: Alan Cox <alan@linux.intel.com>
This commit is contained in:
Tony Prisk 2012-08-03 20:56:25 +12:00
parent 7f4b48b363
commit 4001130df1
1 changed files with 53 additions and 5 deletions
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58
drivers/tty/serial/vt8500_serial.c
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@ -34,6 +34,7 @@
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/of.h>
/*
* UART Register offsets
@ -76,6 +77,8 @@
#define RX_FIFO_INTS (RXFAF | RXFF | RXOVER | PER | FER | RXTOUT)
#define TX_FIFO_INTS (TXFAE | TXFE | TXUDR)
#define VT8500_MAX_PORTS 6
struct vt8500_port {
struct uart_port uart;
char name[16];
@ -83,6 +86,13 @@ struct vt8500_port {
unsigned int ier;
};
/*
* we use this variable to keep track of which ports
* have been allocated as we can't use pdev->id in
* devicetree
*/
static unsigned long vt8500_ports_in_use;
static inline void vt8500_write(struct uart_port *port, unsigned int val,
unsigned int off)
{
@ -431,7 +441,7 @@ static int vt8500_verify_port(struct uart_port *port,
return 0;
}
static struct vt8500_port *vt8500_uart_ports[4];
static struct vt8500_port *vt8500_uart_ports[VT8500_MAX_PORTS];
static struct uart_driver vt8500_uart_driver;
#ifdef CONFIG_SERIAL_VT8500_CONSOLE
@ -548,7 +558,9 @@ static int __devinit vt8500_serial_probe(struct platform_device *pdev)
{
struct vt8500_port *vt8500_port;
struct resource *mmres, *irqres;
struct device_node *np = pdev->dev.of_node;
int ret;
int port;
mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irqres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
@ -559,16 +571,46 @@ static int __devinit vt8500_serial_probe(struct platform_device *pdev)
if (!vt8500_port)
return -ENOMEM;
if (np)
port = of_alias_get_id(np, "serial");
if (port > VT8500_MAX_PORTS)
port = -1;
else
port = -1;
if (port < 0) {
/* calculate the port id */
port = find_first_zero_bit(&vt8500_ports_in_use,
sizeof(vt8500_ports_in_use));
}
if (port > VT8500_MAX_PORTS)
return -ENODEV;
/* reserve the port id */
if (test_and_set_bit(port, &vt8500_ports_in_use)) {
/* port already in use - shouldn't really happen */
return -EBUSY;
}
vt8500_port->uart.type = PORT_VT8500;
vt8500_port->uart.iotype = UPIO_MEM;
vt8500_port->uart.mapbase = mmres->start;
vt8500_port->uart.irq = irqres->start;
vt8500_port->uart.fifosize = 16;
vt8500_port->uart.ops = &vt8500_uart_pops;
vt8500_port->uart.line = pdev->id;
vt8500_port->uart.line = port;
vt8500_port->uart.dev = &pdev->dev;
vt8500_port->uart.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
vt8500_port->uart.uartclk = 24000000;
vt8500_port->clk = of_clk_get(pdev->dev.of_node, 0);
if (vt8500_port->clk) {
vt8500_port->uart.uartclk = clk_get_rate(vt8500_port->clk);
} else {
/* use the default of 24Mhz if not specified and warn */
pr_warn("%s: serial clock source not specified\n", __func__);
vt8500_port->uart.uartclk = 24000000;
}
snprintf(vt8500_port->name, sizeof(vt8500_port->name),
"VT8500 UART%d", pdev->id);
@ -579,7 +621,7 @@ static int __devinit vt8500_serial_probe(struct platform_device *pdev)
goto err;
}
vt8500_uart_ports[pdev->id] = vt8500_port;
vt8500_uart_ports[port] = vt8500_port;
uart_add_one_port(&vt8500_uart_driver, &vt8500_port->uart);
@ -603,12 +645,18 @@ static int __devexit vt8500_serial_remove(struct platform_device *pdev)
return 0;
}
static const struct of_device_id wmt_dt_ids[] = {
{ .compatible = "via,vt8500-uart", },
{}
};
static struct platform_driver vt8500_platform_driver = {
.probe = vt8500_serial_probe,
.remove = __devexit_p(vt8500_serial_remove),
.driver = {
.name = "vt8500_serial",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(wmt_dt_ids),
},
};
@ -642,4 +690,4 @@ module_exit(vt8500_serial_exit);
MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
MODULE_DESCRIPTION("Driver for vt8500 serial device");
MODULE_LICENSE("GPL");
MODULE_LICENSE("GPL v2");