leandrof/u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge branch 'master' of git://git.denx.de/u-boot-nios

Browse Source
This commit is contained in:
Tom Rini 2014-02-17 14:21:03 -05:00
commit b1ad03c242
1 changed files with 16 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
drivers/serial/opencores_yanu.c
View File

@ -8,6 +8,7 @@
#include <watchdog.h>
#include <asm/io.h>
#include <nios2-yanu.h>
#include <serial.h>
DECLARE_GLOBAL_DATA_PTR;
@ -17,62 +18,34 @@ DECLARE_GLOBAL_DATA_PTR;
static yanu_uart_t *uart = (yanu_uart_t *)CONFIG_SYS_NIOS_CONSOLE;
static void oc_serial_setbrg(void)
{
int n, k;
const unsigned max_uns = 0xFFFFFFFF;
unsigned best_n, best_m, baud;
unsigned baudrate;
#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
/* Everything's already setup for fixed-baud PTF assignment*/
static void oc_serial_setbrg(void)
{
int n, k;
const unsigned max_uns = 0xFFFFFFFF;
unsigned best_n, best_m, baud;
/* compute best N and M couple */
best_n = YANU_MAX_PRESCALER_N;
for (n = YANU_MAX_PRESCALER_N; n >= 0; n--) {
if ((unsigned)CONFIG_SYS_CLK_FREQ / (1 << (n + 4)) >=
(unsigned)CONFIG_BAUDRATE) {
best_n = n;
break;
}
}
for (k = 0;; k++) {
if ((unsigned)CONFIG_BAUDRATE <= (max_uns >> (15+n-k)))
break;
}
best_m =
((unsigned)CONFIG_BAUDRATE * (1 << (15 + n - k))) /
((unsigned)CONFIG_SYS_CLK_FREQ >> k);
baud = best_m + best_n * YANU_BAUDE;
writel(baud, &uart->baud);
return;
}
/* Everything's already setup for fixed-baud PTF assignment */
baudrate = CONFIG_BAUDRATE;
#else
static void oc_serial_setbrg(void)
{
int n, k;
const unsigned max_uns = 0xFFFFFFFF;
unsigned best_n, best_m, baud;
baudrate = gd->baudrate;
#endif
/* compute best N and M couple */
best_n = YANU_MAX_PRESCALER_N;
for (n = YANU_MAX_PRESCALER_N; n >= 0; n--) {
if ((unsigned)CONFIG_SYS_CLK_FREQ / (1 << (n + 4)) >=
gd->baudrate) {
baudrate) {
best_n = n;
break;
}
}
for (k = 0;; k++) {
if (gd->baudrate <= (max_uns >> (15+n-k)))
if (baudrate <= (max_uns >> (15+n-k)))
break;
}
best_m =
(gd->baudrate * (1 << (15 + n - k))) /
(baudrate * (1 << (15 + n - k))) /
((unsigned)CONFIG_SYS_CLK_FREQ >> k);
baud = best_m + best_n * YANU_BAUDE;
@ -81,9 +54,6 @@ static void oc_serial_setbrg(void)
return;
}
#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
static int oc_serial_init(void)
{
unsigned action,control;
@ -154,7 +124,7 @@ static int oc_serial_tstc(void)
((1 << YANU_RFIFO_CHARS_N) - 1)) > 0);
}
statoc int oc_serial_getc(void)
static int oc_serial_getc(void)
{
while (serial_tstc() == 0)
WATCHDOG_RESET ();