diff options
Diffstat (limited to 'drivers/serial/arm_dcc.c')
| -rw-r--r-- | drivers/serial/arm_dcc.c | 170 |
1 files changed, 57 insertions, 113 deletions
diff --git a/drivers/serial/arm_dcc.c b/drivers/serial/arm_dcc.c index 5a7fb6b..dca73b9 100644 --- a/drivers/serial/arm_dcc.c +++ b/drivers/serial/arm_dcc.c @@ -29,69 +29,66 @@ #include <common.h> #include <devices.h> -#define DCC_ARM9_RBIT (1 << 0) -#define DCC_ARM9_WBIT (1 << 1) -#define DCC_ARM11_RBIT (1 << 30) -#define DCC_ARM11_WBIT (1 << 29) - -#define read_core_id(x) do { \ - __asm__ ("mrc p15, 0, %0, c0, c0, 0\n" : "=r" (x)); \ - x = (x >> 4) & 0xFFF; \ - } while (0); - +#if defined(CONFIG_CPU_V6) /* - * ARM9 + * ARMV6 */ -#define write_arm9_dcc(x) \ - __asm__ volatile ("mcr p14, 0, %0, c1, c0, 0\n" : : "r" (x)) - -#define read_arm9_dcc(x) \ - __asm__ volatile ("mrc p14, 0, %0, c1, c0, 0\n" : "=r" (x)) +#define DCC_RBIT (1 << 30) +#define DCC_WBIT (1 << 29) -#define status_arm9_dcc(x) \ - __asm__ volatile ("mrc p14, 0, %0, c0, c0, 0\n" : "=r" (x)) +#define write_dcc(x) \ + __asm__ volatile ("mcr p14, 0, %0, c0, c5, 0\n" : : "r" (x)) -#define can_read_arm9_dcc(x) do { \ - status_arm9_dcc(x); \ - x &= DCC_ARM9_RBIT; \ - } while (0); +#define read_dcc(x) \ + __asm__ volatile ("mrc p14, 0, %0, c0, c5, 0\n" : "=r" (x)) -#define can_write_arm9_dcc(x) do { \ - status_arm9_dcc(x); \ - x &= DCC_ARM9_WBIT; \ - x = (x == 0); \ - } while (0); +#define status_dcc(x) \ + __asm__ volatile ("mrc p14, 0, %0, c0, c1, 0\n" : "=r" (x)) +#elif defined(CONFIG_CPU_XSCALE) /* - * ARM11 + * XSCALE */ -#define write_arm11_dcc(x) \ - __asm__ volatile ("mcr p14, 0, %0, c0, c5, 0\n" : : "r" (x)) +#define DCC_RBIT (1 << 31) +#define DCC_WBIT (1 << 28) -#define read_arm11_dcc(x) \ - __asm__ volatile ("mrc p14, 0, %0, c0, c5, 0\n" : "=r" (x)) +#define write_dcc(x) \ + __asm__ volatile ("mcr p14, 0, %0, c8, c0, 0\n" : : "r" (x)) -#define status_arm11_dcc(x) \ - __asm__ volatile ("mrc p14, 0, %0, c0, c1, 0\n" : "=r" (x)) +#define read_dcc(x) \ + __asm__ volatile ("mrc p14, 0, %0, c9, c0, 0\n" : "=r" (x)) + +#define status_dcc(x) \ + __asm__ volatile ("mrc p14, 0, %0, c14, c0, 0\n" : "=r" (x)) + +#else +#define DCC_RBIT (1 << 0) +#define DCC_WBIT (1 << 1) + +#define write_dcc(x) \ + __asm__ volatile ("mcr p14, 0, %0, c1, c0, 0\n" : : "r" (x)) -#define can_read_arm11_dcc(x) do { \ - status_arm11_dcc(x); \ - x &= DCC_ARM11_RBIT; \ +#define read_dcc(x) \ + __asm__ volatile ("mrc p14, 0, %0, c1, c0, 0\n" : "=r" (x)) + +#define status_dcc(x) \ + __asm__ volatile ("mrc p14, 0, %0, c0, c0, 0\n" : "=r" (x)) + +#endif + +#define can_read_dcc(x) do { \ + status_dcc(x); \ + x &= DCC_RBIT; \ } while (0); -#define can_write_arm11_dcc(x) do { \ - status_arm11_dcc(x); \ - x &= DCC_ARM11_WBIT; \ - x = (x == 0); \ +#define can_write_dcc(x) do { \ + status_dcc(x); \ + x &= DCC_WBIT; \ + x = (x == 0); \ } while (0); #define TIMEOUT_COUNT 0x4000000 -static enum { - arm9_and_earlier, - arm11_and_later -} arm_type = arm9_and_earlier; - #ifndef CONFIG_ARM_DCC_MULTI #define arm_dcc_init serial_init void serial_setbrg(void) {} @@ -103,15 +100,6 @@ void serial_setbrg(void) {} int arm_dcc_init(void) { - register unsigned int id; - - read_core_id(id); - - if (id >= 0xb00) - arm_type = arm11_and_later; - else - arm_type = arm9_and_earlier; - return 0; } @@ -120,22 +108,10 @@ int arm_dcc_getc(void) int ch; register unsigned int reg; - switch (arm_type) { - case arm11_and_later: - do { - can_read_arm11_dcc(reg); - } while (!reg); - read_arm11_dcc(ch); - break; - - case arm9_and_earlier: - default: - do { - can_read_arm9_dcc(reg); - } while (!reg); - read_arm9_dcc(ch); - break; - } + do { + can_read_dcc(reg); + } while (!reg); + read_dcc(ch); return ch; } @@ -145,32 +121,15 @@ void arm_dcc_putc(char ch) register unsigned int reg; unsigned int timeout_count = TIMEOUT_COUNT; - switch (arm_type) { - case arm11_and_later: - while (--timeout_count) { - can_write_arm11_dcc(reg); - if (reg) - break; - } - if (timeout_count == 0) - return; - else - write_arm11_dcc(ch); - break; - - case arm9_and_earlier: - default: - while (--timeout_count) { - can_write_arm9_dcc(reg); - if (reg) - break; - } - if (timeout_count == 0) - return; - else - write_arm9_dcc(ch); - break; + while (--timeout_count) { + can_write_dcc(reg); + if (reg) + break; } + if (timeout_count == 0) + return; + else + write_dcc(ch); } void arm_dcc_puts(const char *s) @@ -183,15 +142,7 @@ int arm_dcc_tstc(void) { register unsigned int reg; - switch (arm_type) { - case arm11_and_later: - can_read_arm11_dcc(reg); - break; - case arm9_and_earlier: - default: - can_read_arm9_dcc(reg); - break; - } + can_read_dcc(reg); return reg; } @@ -214,13 +165,6 @@ int drv_arm_dcc_init(void) arm_dcc_dev.putc = arm_dcc_putc; /* 'putc' function */ arm_dcc_dev.puts = arm_dcc_puts; /* 'puts' function */ - rc = device_register(&arm_dcc_dev); - - if (rc == 0) { - arm_dcc_init(); - return 1; - } - - return 0; + return device_register(&arm_dcc_dev); } #endif |