diff options
Diffstat (limited to 'drivers/tty/hvc/hvc_dcc.c')
| -rw-r--r-- | drivers/tty/hvc/hvc_dcc.c | 43 |
1 files changed, 7 insertions, 36 deletions
diff --git a/drivers/tty/hvc/hvc_dcc.c b/drivers/tty/hvc/hvc_dcc.c index 6470f63deb4b..435f6facbc23 100644 --- a/drivers/tty/hvc/hvc_dcc.c +++ b/drivers/tty/hvc/hvc_dcc.c @@ -33,54 +33,29 @@ static inline u32 __dcc_getstatus(void) { u32 __ret; - - asm("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg" + asm volatile("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg" : "=r" (__ret) : : "cc"); return __ret; } -#if defined(CONFIG_CPU_V7) static inline char __dcc_getchar(void) { char __c; - asm("get_wait: mrc p14, 0, pc, c0, c1, 0 \n\ - bne get_wait \n\ - mrc p14, 0, %0, c0, c5, 0 @ read comms data reg" - : "=r" (__c) : : "cc"); - - return __c; -} -#else -static inline char __dcc_getchar(void) -{ - char __c; - - asm("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg" + asm volatile("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg" : "=r" (__c)); return __c; } -#endif -#if defined(CONFIG_CPU_V7) -static inline void __dcc_putchar(char c) -{ - asm("put_wait: mrc p14, 0, pc, c0, c1, 0 \n\ - bcs put_wait \n\ - mcr p14, 0, %0, c0, c5, 0 " - : : "r" (c) : "cc"); -} -#else static inline void __dcc_putchar(char c) { - asm("mcr p14, 0, %0, c0, c5, 0 @ write a char" + asm volatile("mcr p14, 0, %0, c0, c5, 0 @ write a char" : /* no output register */ : "r" (c)); } -#endif static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count) { @@ -90,7 +65,7 @@ static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count) while (__dcc_getstatus() & DCC_STATUS_TX) cpu_relax(); - __dcc_putchar((char)(buf[i] & 0xFF)); + __dcc_putchar(buf[i]); } return count; @@ -100,15 +75,11 @@ static int hvc_dcc_get_chars(uint32_t vt, char *buf, int count) { int i; - for (i = 0; i < count; ++i) { - int c = -1; - + for (i = 0; i < count; ++i) if (__dcc_getstatus() & DCC_STATUS_RX) - c = __dcc_getchar(); - if (c < 0) + buf[i] = __dcc_getchar(); + else break; - buf[i] = c; - } return i; } |