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[POWERPC] Uartlite: Add macros for register names

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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>
This commit is contained in:
Grant Likely 2007-10-03 02:44:15 +10:00 committed by Josh Boyer
parent 69c9c94303
commit be1b4d34e3
1 changed files with 21 additions and 6 deletions
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27
arch/powerpc/boot/uartlite.c
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@ -16,30 +16,45 @@
#include "io.h" #include "io.h"
#include "ops.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 void * reg_base;
static int uartlite_open(void) static int uartlite_open(void)
{ {
/* Clear the RX FIFO */ /* Clear the RX FIFO */
out_be32(reg_base + 0x0C, 0x2); out_be32(reg_base + ULITE_CONTROL, ULITE_CONTROL_RST_RX);
return 0; return 0;
} }
static void uartlite_putc(unsigned char c) static void uartlite_putc(unsigned char c)
{ {
while ((in_be32(reg_base + 0x8) & 0x08) != 0); /* spin */ u32 reg = ULITE_STATUS_TXFULL;
out_be32(reg_base + 0x4, c); 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) static unsigned char uartlite_getc(void)
{ {
while ((in_be32(reg_base + 0x8) & 0x01) == 0); /* spin */ u32 reg = ULITE_STATUS_RXVALID;
return in_be32(reg_base); 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) 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) int uartlite_console_init(void *devp, struct serial_console_data *scdp)