diff options
| author | Grant Likely <grant.likely@secretlab.ca> | 2007-10-03 02:44:15 +1000 |
|---|---|---|
| committer | Josh Boyer <jwboyer@linux.vnet.ibm.com> | 2007-10-03 07:37:03 -0500 |
| commit | be1b4d34e3a379d20d50e75a95aa5c3f0c7cf612 (patch) | |
| tree | 0cc0b54496f75dcfced9df35b35e78aad15e7358 | |
| parent | 69c9c94303e309c02cf4b3e671a46a34fd0c4b0b (diff) | |
[POWERPC] Uartlite: Add macros for register names
Add macros to define register names to improve readability.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
| -rw-r--r-- | arch/powerpc/boot/uartlite.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/arch/powerpc/boot/uartlite.c b/arch/powerpc/boot/uartlite.c index f4249a74c367..38a470b329e3 100644 --- a/arch/powerpc/boot/uartlite.c +++ b/arch/powerpc/boot/uartlite.c @@ -16,30 +16,45 @@ #include "io.h" #include "ops.h" +#define ULITE_RX 0x00 +#define ULITE_TX 0x04 +#define ULITE_STATUS 0x08 +#define ULITE_CONTROL 0x0c + +#define ULITE_STATUS_RXVALID 0x01 +#define ULITE_STATUS_TXFULL 0x08 + +#define ULITE_CONTROL_RST_RX 0x02 + static void * reg_base; static int uartlite_open(void) { /* Clear the RX FIFO */ - out_be32(reg_base + 0x0C, 0x2); + out_be32(reg_base + ULITE_CONTROL, ULITE_CONTROL_RST_RX); return 0; } static void uartlite_putc(unsigned char c) { - while ((in_be32(reg_base + 0x8) & 0x08) != 0); /* spin */ - out_be32(reg_base + 0x4, c); + u32 reg = ULITE_STATUS_TXFULL; + while (reg & ULITE_STATUS_TXFULL) /* spin on TXFULL bit */ + reg = in_be32(reg_base + ULITE_STATUS); + out_be32(reg_base + ULITE_TX, c); } static unsigned char uartlite_getc(void) { - while ((in_be32(reg_base + 0x8) & 0x01) == 0); /* spin */ - return in_be32(reg_base); + u32 reg = ULITE_STATUS_RXVALID; + while (reg & ULITE_STATUS_RXVALID) /* spin on RXVALID bit */ + reg = in_be32(reg_base + ULITE_STATUS); + return in_be32(reg_base + ULITE_RX); } static u8 uartlite_tstc(void) { - return ((in_be32(reg_base + 0x8) & 0x01) != 0); + u32 reg = in_be32(reg_base + ULITE_STATUS); + return reg & ULITE_STATUS_RXVALID; } int uartlite_console_init(void *devp, struct serial_console_data *scdp) |