serial: earlycon: Extend earlycon command line option to support 64-bit addresses

earlycon implementation used "unsigned long" internally, but there are systems
(ARM with LPAE) where sizeof(unsigned long) == 4 and uart is mapped beyond 4GiB
address range.

Switch to resource_size_t internally and replace obsoleted simple_strtoul() with
kstrtoull().

Signed-off-by: Alexander Sverdlin <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/8250/8250_core.c

···
 {
 	char match[] = "uart";	/* 8250-specific earlycon name */
 	unsigned char iotype;
-	unsigned long addr;
+	resource_size_t addr;
 	int i;
 
 	if (strncmp(name, match, 4) != 0)

drivers/tty/serial/earlycon.c

···
 	.con = &early_con,
 };
 
-static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
+static void __iomem * __init earlycon_map(resource_size_t paddr, size_t size)
 {
 	void __iomem *base;
 #ifdef CONFIG_FIX_EARLYCON_MEM
···
 	base = ioremap(paddr, size);
 #endif
 	if (!base)
-		pr_err("%s: Couldn't map 0x%llx\n", __func__,
-		       (unsigned long long)paddr);
+		pr_err("%s: Couldn't map %pa\n", __func__, &paddr);
 
 	return base;
 }
···
 {
 	struct uart_port *port = &device->port;
 	int length;
-	unsigned long addr;
+	resource_size_t addr;
 
 	if (uart_parse_earlycon(options, &port->iotype, &addr, &options))
 		return -EINVAL;

drivers/tty/serial/serial_core.c

···
  *	   console=<name>,0x<addr>,<options>
  *	is also accepted; the returned @iotype will be UPIO_MEM.
  *
- *	Returns 0 on success or -EINVAL on failure
+ *	Returns 0 on success, -EINVAL or -ERANGE on failure
  */
-int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
+int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
 			char **options)
 {
+	int ret;
+	unsigned long long tmp;
+
 	if (strncmp(p, "mmio,", 5) == 0) {
 		*iotype = UPIO_MEM;
 		p += 5;
···
 		return -EINVAL;
 	}
 
-	*addr = simple_strtoul(p, NULL, 0);
+	ret = kstrtoull(p, 0, &tmp);
+	if (ret)
+		return ret;
+	*addr = tmp;
 	p = strchr(p, ',');
 	if (p)
 		p++;

include/linux/serial_core.h

···
 
 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 				   struct console *c);
-int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
+int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
 			char **options);
 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 			int *flow);