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MIPS: BCM47XX: Remove CFE support 

bcm47xx only uses the CFE code for early print to a console, but that
is also possible with a early print serial 8250 driver.

The CFE api init causes hangs somewhere in prom_init_cfe() on some
devices like the Buffalo WHR-HP-G54 and the Asus WL-520GU.
This was reported in https://dev.openwrt.org/ticket/4061 and
https://forum.openwrt.org/viewtopic.php?id=17063

This will remove all the CFE handling code from bcm47xx.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/5888/
This commit is contained in:
Hauke Mehrtens 2013-09-25 00:36:55 +02:00 committed by Ralf Baechle
parent dd5732850e
commit cb881f5e15
2 changed files with 0 additions and 93 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/mips/Kconfig
View File

@ -114,14 +114,12 @@ config BCM47XX
select CEVT_R4K
select CSRC_R4K
select DMA_NONCOHERENT
select FW_CFE
select HW_HAS_PCI
select IRQ_CPU
select SYS_HAS_CPU_MIPS32_R1
select NO_EXCEPT_FILL
select SYS_SUPPORTS_32BIT_KERNEL
select SYS_SUPPORTS_LITTLE_ENDIAN
select SYS_HAS_EARLY_PRINTK
help
Support for BCM47XX based boards

91
arch/mips/bcm47xx/prom.c
View File

@ -30,12 +30,9 @@
#include <linux/spinlock.h>
#include <linux/smp.h>
#include <asm/bootinfo.h>
#include <asm/fw/cfe/cfe_api.h>
#include <asm/fw/cfe/cfe_error.h>
#include <bcm47xx.h>
#include <bcm47xx_board.h>
static int cfe_cons_handle;
static char bcm47xx_system_type[20] = "Broadcom BCM47XX";
@ -52,91 +49,6 @@ __init void bcm47xx_set_system_type(u16 chip_id)
chip_id);
}
void prom_putchar(char c)
{
while (cfe_write(cfe_cons_handle, &c, 1) == 0)
;
}
static __init void prom_init_cfe(void)
{
uint32_t cfe_ept;
uint32_t cfe_handle;
uint32_t cfe_eptseal;
int argc = fw_arg0;
char **envp = (char **) fw_arg2;
int *prom_vec = (int *) fw_arg3;
/*
* Check if a loader was used; if NOT, the 4 arguments are
* what CFE gives us (handle, 0, EPT and EPTSEAL)
*/
if (argc < 0) {
cfe_handle = (uint32_t)argc;
cfe_ept = (uint32_t)envp;
cfe_eptseal = (uint32_t)prom_vec;
} else {
if ((int)prom_vec < 0) {
/*
* Old loader; all it gives us is the handle,
* so use the "known" entrypoint and assume
* the seal.
*/
cfe_handle = (uint32_t)prom_vec;
cfe_ept = 0xBFC00500;
cfe_eptseal = CFE_EPTSEAL;
} else {
/*
* Newer loaders bundle the handle/ept/eptseal
* Note: prom_vec is in the loader's useg
* which is still alive in the TLB.
*/
cfe_handle = prom_vec[0];
cfe_ept = prom_vec[2];
cfe_eptseal = prom_vec[3];
}
}
if (cfe_eptseal != CFE_EPTSEAL) {
/* too early for panic to do any good */
printk(KERN_ERR "CFE's entrypoint seal doesn't match.");
while (1) ;
}
cfe_init(cfe_handle, cfe_ept);
}
static __init void prom_init_console(void)
{
/* Initialize CFE console */
cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
}
static __init void prom_init_cmdline(void)
{
static char buf[COMMAND_LINE_SIZE] __initdata;
/* Get the kernel command line from CFE */
if (cfe_getenv("LINUX_CMDLINE", buf, COMMAND_LINE_SIZE) >= 0) {
buf[COMMAND_LINE_SIZE - 1] = 0;
strcpy(arcs_cmdline, buf);
}
/* Force a console handover by adding a console= argument if needed,
* as CFE is not available anymore later in the boot process. */
if ((strstr(arcs_cmdline, "console=")) == NULL) {
/* Try to read the default serial port used by CFE */
if ((cfe_getenv("BOOT_CONSOLE", buf, COMMAND_LINE_SIZE) < 0)
|| (strncmp("uart", buf, 4)))
/* Default to uart0 */
strcpy(buf, "uart0");
/* Compute the new command line */
snprintf(arcs_cmdline, COMMAND_LINE_SIZE, "%s console=ttyS%c,115200",
arcs_cmdline, buf[4]);
}
}
static __init void prom_init_mem(void)
{
unsigned long mem;
@ -184,9 +96,6 @@ static __init void prom_init_mem(void)
void __init prom_init(void)
{
prom_init_cfe();
prom_init_console();
prom_init_cmdline();
prom_init_mem();
}