diff options
Diffstat (limited to 'kernel/arch/mips/mti-sead3/sead3-init.c')
| -rw-r--r-- | kernel/arch/mips/mti-sead3/sead3-init.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/kernel/arch/mips/mti-sead3/sead3-init.c b/kernel/arch/mips/mti-sead3/sead3-init.c new file mode 100644 index 000000000..3572ea301 --- /dev/null +++ b/kernel/arch/mips/mti-sead3/sead3-init.c @@ -0,0 +1,152 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. + */ +#include <linux/init.h> +#include <linux/io.h> + +#include <asm/bootinfo.h> +#include <asm/cacheflush.h> +#include <asm/traps.h> +#include <asm/mips-boards/generic.h> +#include <asm/fw/fw.h> + +extern char except_vec_nmi; +extern char except_vec_ejtag_debug; + +#ifdef CONFIG_SERIAL_8250_CONSOLE +static void __init console_config(void) +{ + char console_string[40]; + int baud = 0; + char parity = '\0', bits = '\0', flow = '\0'; + char *s; + + if ((strstr(fw_getcmdline(), "console=")) == NULL) { + s = fw_getenv("modetty0"); + if (s) { + while (*s >= '0' && *s <= '9') + baud = baud*10 + *s++ - '0'; + if (*s == ',') + s++; + if (*s) + parity = *s++; + if (*s == ',') + s++; + if (*s) + bits = *s++; + if (*s == ',') + s++; + if (*s == 'h') + flow = 'r'; + } + if (baud == 0) + baud = 38400; + if (parity != 'n' && parity != 'o' && parity != 'e') + parity = 'n'; + if (bits != '7' && bits != '8') + bits = '8'; + if (flow == '\0') + flow = 'r'; + sprintf(console_string, " console=ttyS0,%d%c%c%c", baud, + parity, bits, flow); + strcat(fw_getcmdline(), console_string); + } +} +#endif + +static void __init mips_nmi_setup(void) +{ + void *base; + + base = cpu_has_veic ? + (void *)(CAC_BASE + 0xa80) : + (void *)(CAC_BASE + 0x380); +#ifdef CONFIG_CPU_MICROMIPS + /* + * Decrement the exception vector address by one for microMIPS. + */ + memcpy(base, (&except_vec_nmi - 1), 0x80); + + /* + * This is a hack. We do not know if the boot loader was built with + * microMIPS instructions or not. If it was not, the NMI exception + * code at 0x80000a80 will be taken in MIPS32 mode. The hand coded + * assembly below forces us into microMIPS mode if we are a pure + * microMIPS kernel. The assembly instructions are: + * + * 3C1A8000 lui k0,0x8000 + * 375A0381 ori k0,k0,0x381 + * 03400008 jr k0 + * 00000000 nop + * + * The mode switch occurs by jumping to the unaligned exception + * vector address at 0x80000381 which would have been 0x80000380 + * in MIPS32 mode. The jump to the unaligned address transitions + * us into microMIPS mode. + */ + if (!cpu_has_veic) { + void *base2 = (void *)(CAC_BASE + 0xa80); + *((unsigned int *)base2) = 0x3c1a8000; + *((unsigned int *)base2 + 1) = 0x375a0381; + *((unsigned int *)base2 + 2) = 0x03400008; + *((unsigned int *)base2 + 3) = 0x00000000; + flush_icache_range((unsigned long)base2, + (unsigned long)base2 + 0x10); + } +#else + memcpy(base, &except_vec_nmi, 0x80); +#endif + flush_icache_range((unsigned long)base, (unsigned long)base + 0x80); +} + +static void __init mips_ejtag_setup(void) +{ + void *base; + + base = cpu_has_veic ? + (void *)(CAC_BASE + 0xa00) : + (void *)(CAC_BASE + 0x300); +#ifdef CONFIG_CPU_MICROMIPS + /* Deja vu... */ + memcpy(base, (&except_vec_ejtag_debug - 1), 0x80); + if (!cpu_has_veic) { + void *base2 = (void *)(CAC_BASE + 0xa00); + *((unsigned int *)base2) = 0x3c1a8000; + *((unsigned int *)base2 + 1) = 0x375a0301; + *((unsigned int *)base2 + 2) = 0x03400008; + *((unsigned int *)base2 + 3) = 0x00000000; + flush_icache_range((unsigned long)base2, + (unsigned long)base2 + 0x10); + } +#else + memcpy(base, &except_vec_ejtag_debug, 0x80); +#endif + flush_icache_range((unsigned long)base, (unsigned long)base + 0x80); +} + +void __init prom_init(void) +{ + board_nmi_handler_setup = mips_nmi_setup; + board_ejtag_handler_setup = mips_ejtag_setup; + + fw_init_cmdline(); +#ifdef CONFIG_EARLY_PRINTK + if ((strstr(fw_getcmdline(), "console=ttyS0")) != NULL) + fw_init_early_console(0); + else if ((strstr(fw_getcmdline(), "console=ttyS1")) != NULL) + fw_init_early_console(1); +#endif +#ifdef CONFIG_SERIAL_8250_CONSOLE + if ((strstr(fw_getcmdline(), "console=")) == NULL) + strcat(fw_getcmdline(), " console=ttyS0,38400n8r"); + console_config(); +#endif +} + +void __init prom_free_prom_memory(void) +{ +} |