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microblaze: Simplify early console binding from DT

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Recognize early Linux console from chosen - linux,stdout-path
instead of detecting the first console with appropriate
compatible strings.
This patch solved the problem on system with multiple
consoles.

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2011-04-14 11:48:43 +02:00
parent e721a45fbe
commit 2aa8e37596
3 changed files with 70 additions and 82 deletions
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8
arch/microblaze/include/asm/prom.h
View File

@ -26,8 +26,12 @@
#define HAVE_ARCH_DEVTREE_FIXUPS
/* Other Prototypes */
extern int early_uartlite_console(void);
extern int early_uart16550_console(void);
enum early_consoles {
UARTLITE = 1,
UART16550 = 2,
};
extern int of_early_console(void *version);
#ifdef CONFIG_PCI
/*

52
arch/microblaze/kernel/early_printk.c
View File

@ -127,45 +127,41 @@ void early_printk(const char *fmt, ...)
int __init setup_early_printk(char *opt)
{
int version = 0;
if (early_console_initialized)
return 1;
base_addr = of_early_console(&version);
if (base_addr) {
#ifdef CONFIG_MMU
early_console_reg_tlb_alloc(base_addr);
#endif
switch (version) {
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
base_addr = early_uartlite_console();
if (base_addr) {
early_console_initialized = 1;
#ifdef CONFIG_MMU
early_console_reg_tlb_alloc(base_addr);
case UARTLITE:
printk(KERN_INFO "Early console on uartlite "
"at 0x%08x\n", base_addr);
early_console = &early_serial_uartlite_console;
break;
#endif
early_console = &early_serial_uartlite_console;
early_printk("early_printk_console is enabled at 0x%08x\n",
base_addr);
register_console(early_console);
return 0;
}
#endif /* CONFIG_SERIAL_UARTLITE_CONSOLE */
#ifdef CONFIG_SERIAL_8250_CONSOLE
base_addr = early_uart16550_console();
base_addr &= ~3; /* clear register offset */
if (base_addr) {
early_console_initialized = 1;
#ifdef CONFIG_MMU
early_console_reg_tlb_alloc(base_addr);
case UART16550:
printk(KERN_INFO "Early console on uart16650 "
"at 0x%08x\n", base_addr);
early_console = &early_serial_uart16550_console;
break;
#endif
early_console = &early_serial_uart16550_console;
early_printk("early_printk_console is enabled at 0x%08x\n",
base_addr);
default:
printk(KERN_INFO "Unsupported early console %d\n",
version);
return 1;
}
register_console(early_console);
early_console_initialized = 1;
return 0;
}
#endif /* CONFIG_SERIAL_8250_CONSOLE */
return 1;
}

92
arch/microblaze/kernel/prom.c
View File

@ -53,69 +53,57 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
}
#ifdef CONFIG_EARLY_PRINTK
/* MS this is Microblaze specifig function */
static int __init early_init_dt_scan_serial(unsigned long node,
char *stdout;
int __init early_init_dt_scan_chosen_serial(unsigned long node,
const char *uname, int depth, void *data)
{
unsigned long l;
char *p;
const __be32 *addr;
pr_debug("search \"serial\", depth: %d, uname: %s\n", depth, uname);
pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname);
/* find all serial nodes */
if (strncmp(uname, "serial", 6) != 0)
return 0;
if (depth == 1 && (strcmp(uname, "chosen") == 0 ||
strcmp(uname, "chosen@0") == 0)) {
p = of_get_flat_dt_prop(node, "linux,stdout-path", &l);
if (p != NULL && l > 0)
stdout = p; /* store pointer to stdout-path */
}
/* find compatible node with uartlite */
p = of_get_flat_dt_prop(node, "compatible", &l);
if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) &&
(strncmp(p, "xlnx,opb-uartlite", 17) != 0) &&
(strncmp(p, "xlnx,axi-uartlite", 17) != 0))
return 0;
if (stdout && strstr(stdout, uname)) {
p = of_get_flat_dt_prop(node, "compatible", &l);
pr_debug("Compatible string: %s\n", p);
addr = of_get_flat_dt_prop(node, "reg", &l);
return be32_to_cpup(addr); /* return address */
if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) ||
(strncmp(p, "xlnx,axi-uart16550", 18) == 0)) {
unsigned int addr;
*(u32 *)data = UART16550;
addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
addr += *(u32 *)of_get_flat_dt_prop(node,
"reg-offset", &l);
/* clear register offset */
return be32_to_cpu(addr) & ~3;
}
if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) ||
(strncmp(p, "xlnx,opb-uartlite", 17) == 0) ||
(strncmp(p, "xlnx,axi-uartlite", 17) == 0)) {
unsigned int *addrp;
*(u32 *)data = UARTLITE;
addrp = of_get_flat_dt_prop(node, "reg", &l);
return be32_to_cpup(addrp); /* return address */
}
}
return 0;
}
/* this function is looking for early uartlite console - Microblaze specific */
int __init early_uartlite_console(void)
/* this function is looking for early console - Microblaze specific */
int __init of_early_console(void *version)
{
return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
}
/* MS this is Microblaze specifig function */
static int __init early_init_dt_scan_serial_full(unsigned long node,
const char *uname, int depth, void *data)
{
unsigned long l;
char *p;
unsigned int addr;
pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
/* find all serial nodes */
if (strncmp(uname, "serial", 6) != 0)
return 0;
early_init_dt_check_for_initrd(node);
/* find compatible node with uartlite */
p = of_get_flat_dt_prop(node, "compatible", &l);
if ((strncmp(p, "xlnx,xps-uart16550", 18) != 0) &&
(strncmp(p, "xlnx,axi-uart16550", 18) != 0))
return 0;
addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
addr += *(u32 *)of_get_flat_dt_prop(node, "reg-offset", &l);
return be32_to_cpu(addr); /* return address */
}
/* this function is looking for early uartlite console - Microblaze specific */
int __init early_uart16550_console(void)
{
return of_scan_flat_dt(early_init_dt_scan_serial_full, NULL);
return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version);
}
#endif