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Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/apbuart.c48
1 files changed, 19 insertions, 29 deletions
diff --git a/drivers/serial/apbuart.c b/drivers/serial/apbuart.c
index cc01c650a144..2e84d9c3d419 100644
--- a/drivers/serial/apbuart.c
+++ b/drivers/serial/apbuart.c
@@ -593,54 +593,44 @@ static struct of_platform_driver grlib_apbuart_of_driver = {
};
-static void grlib_apbuart_configure(void)
+static int grlib_apbuart_configure(void)
{
- static int enum_done;
struct device_node *np, *rp;
- struct uart_port *port = NULL;
const u32 *prop;
- int freq_khz;
- int v = 0, d = 0;
- unsigned int addr;
- int irq, line;
- struct amba_prom_registers *regs;
-
- if (enum_done)
- return;
+ int freq_khz, line = 0;
/* Get bus frequency */
rp = of_find_node_by_path("/");
+ if (!rp)
+ return -ENODEV;
rp = of_get_next_child(rp, NULL);
+ if (!rp)
+ return -ENODEV;
prop = of_get_property(rp, "clock-frequency", NULL);
+ if (!prop)
+ return -ENODEV;
freq_khz = *prop;
- line = 0;
for_each_matching_node(np, apbuart_match) {
+ const int *irqs = of_get_property(np, "interrupts", NULL);
+ const struct amba_prom_registers *regs;
+ struct uart_port *port;
+ unsigned long addr;
- int *vendor = (int *) of_get_property(np, "vendor", NULL);
- int *device = (int *) of_get_property(np, "device", NULL);
- int *irqs = (int *) of_get_property(np, "interrupts", NULL);
- regs = (struct amba_prom_registers *)
- of_get_property(np, "reg", NULL);
-
- if (vendor)
- v = *vendor;
- if (device)
- d = *device;
+ regs = of_get_property(np, "reg", NULL);
if (!irqs || !regs)
- return;
+ return -ENODEV;
grlib_apbuart_nodes[line] = np;
addr = regs->phys_addr;
- irq = *irqs;
port = &grlib_apbuart_ports[line];
port->mapbase = addr;
port->membase = ioremap(addr, sizeof(struct grlib_apbuart_regs_map));
- port->irq = irq;
+ port->irq = *irqs;
port->iotype = UPIO_MEM;
port->ops = &grlib_apbuart_ops;
port->flags = UPF_BOOT_AUTOCONF;
@@ -652,12 +642,10 @@ static void grlib_apbuart_configure(void)
/* We support maximum UART_NR uarts ... */
if (line == UART_NR)
break;
-
}
- enum_done = 1;
-
grlib_apbuart_driver.nr = grlib_apbuart_port_nr = line;
+ return line ? 0 : -ENODEV;
}
static int __init grlib_apbuart_init(void)
@@ -665,7 +653,9 @@ static int __init grlib_apbuart_init(void)
int ret;
/* Find all APBUARTS in device the tree and initialize their ports */
- grlib_apbuart_configure();
+ ret = grlib_apbuart_configure();
+ if (ret)
+ return ret;
printk(KERN_INFO "Serial: GRLIB APBUART driver\n");