[U-Boot-Users] [PATCH] FSL: Generalize PIXIS reset command parsing.
Jon Loeliger
jdl at freescale.com
Wed Jan 16 19:28:35 CET 2008
From: James Yang <james.yang at freescale.com>
Before, the order of arguments to the pixis_reset
command needed to be supplied in a hard-coded order.
Generalize the command parsing to allow any order.
Signed-off-by: James Yang <james.yang at freescale.com>
Acked-by: Jon Loeliger <jdl at freescale.com>
---
board/freescale/common/pixis.c | 214 ++++++++++++++++++++--------------------
1 files changed, 106 insertions(+), 108 deletions(-)
diff --git a/board/freescale/common/pixis.c b/board/freescale/common/pixis.c
index 00eb4a0..bff6a82 100644
--- a/board/freescale/common/pixis.c
+++ b/board/freescale/common/pixis.c
@@ -183,7 +183,7 @@ int set_px_corepll(ulong corepll)
void read_from_px_regs(int set)
{
- u8 mask = 0x1C;
+ u8 mask = 0x1C; /* COREPLL, MPXPLL, SYSCLK controlled by PIXIS */
u8 tmp = in8(PIXIS_BASE + PIXIS_VCFGEN0);
if (set)
@@ -196,7 +196,7 @@ void read_from_px_regs(int set)
void read_from_px_regs_altbank(int set)
{
- u8 mask = 0x04;
+ u8 mask = 0x04; /* FLASHBANK and FLASHMAP controlled by PIXIS */
u8 tmp = in8(PIXIS_BASE + PIXIS_VCFGEN1);
if (set)
@@ -207,15 +207,26 @@ void read_from_px_regs_altbank(int set)
}
#ifndef CFG_PIXIS_VBOOT_MASK
-#define CFG_PIXIS_VBOOT_MASK 0x40
+#define CFG_PIXIS_VBOOT_MASK (0x40)
#endif
+void clear_altbank(void)
+{
+ u8 tmp;
+
+ tmp = in8(PIXIS_BASE + PIXIS_VBOOT);
+ tmp &= ~CFG_PIXIS_VBOOT_MASK;
+
+ out8(PIXIS_BASE + PIXIS_VBOOT, tmp);
+}
+
+
void set_altbank(void)
{
u8 tmp;
tmp = in8(PIXIS_BASE + PIXIS_VBOOT);
- tmp ^= CFG_PIXIS_VBOOT_MASK;
+ tmp |= CFG_PIXIS_VBOOT_MASK;
out8(PIXIS_BASE + PIXIS_VBOOT, tmp);
}
@@ -226,11 +237,11 @@ void set_px_go(void)
u8 tmp;
tmp = in8(PIXIS_BASE + PIXIS_VCTL);
- tmp = tmp & 0x1E;
+ tmp = tmp & 0x1E; /* clear GO bit */
out8(PIXIS_BASE + PIXIS_VCTL, tmp);
tmp = in8(PIXIS_BASE + PIXIS_VCTL);
- tmp = tmp | 0x01;
+ tmp = tmp | 0x01; /* set GO bit - start reset sequencer */
out8(PIXIS_BASE + PIXIS_VCTL, tmp);
}
@@ -292,7 +303,7 @@ static ulong strfractoint(uchar *strptr)
* simply create the intarr.
*/
i = 0;
- while (strptr[i] != 46) {
+ while (strptr[i] != '.') {
if (strptr[i] == 0) {
no_dec = 1;
break;
@@ -312,7 +323,7 @@ static ulong strfractoint(uchar *strptr)
} else {
j = 0;
i++; /* Skipping the decimal point */
- while ((strptr[i] > 47) && (strptr[i] < 58)) {
+ while ((strptr[i] >= '0') && (strptr[i] <= '9')) {
decarr[j] = strptr[i];
i++;
j++;
@@ -339,8 +350,14 @@ static ulong strfractoint(uchar *strptr)
int
pixis_reset_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
- ulong val;
- ulong corepll;
+ unsigned int i;
+ char *p_cf = NULL;
+ char *p_cf_sysclk = NULL;
+ char *p_cf_corepll = NULL;
+ char *p_cf_mpxpll = NULL;
+ char *p_altbank = NULL;
+ char *p_wd = NULL;
+ unsigned int unknown_param = 0;
/*
* No args is a simple reset request.
@@ -350,116 +367,97 @@ pixis_reset_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
/* not reached */
}
- if (strcmp(argv[1], "cf") == 0) {
+ for (i = 1; i < argc; i++) {
+ if (strcmp(argv[i], "cf") == 0) {
+ p_cf = argv[i];
+ if (i + 3 >= argc) {
+ break;
+ }
+ p_cf_sysclk = argv[i+1];
+ p_cf_corepll = argv[i+2];
+ p_cf_mpxpll = argv[i+3];
+ i += 3;
+ continue;
+ }
- /*
- * Reset with frequency changed:
- * cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>
- */
- if (argc < 5) {
- puts(cmdtp->usage);
- return 1;
+ if (strcmp(argv[i], "altbank") == 0) {
+ p_altbank = argv[i];
+ continue;
}
- read_from_px_regs(0);
-
- val = set_px_sysclk(simple_strtoul(argv[2], NULL, 10));
-
- corepll = strfractoint((uchar *)argv[3]);
- val = val + set_px_corepll(corepll);
- val = val + set_px_mpxpll(simple_strtoul(argv[4], NULL, 10));
- if (val == 3) {
- puts("Setting registers VCFGEN0 and VCTL\n");
- read_from_px_regs(1);
- puts("Resetting board with values from ");
- puts("VSPEED0, VSPEED1, VCLKH, and VCLKL \n");
- set_px_go();
- } else {
- puts(cmdtp->usage);
- return 1;
+ if (strcmp(argv[i], "wd") == 0) {
+ p_wd = argv[i];
+ continue;
}
- while (1) ; /* Not reached */
-
- } else if (strcmp(argv[1], "altbank") == 0) {
-
- /*
- * Reset using alternate flash bank:
- */
- if (argv[2] == 0) {
- /*
- * Reset from alternate bank without changing
- * frequency and without watchdog timer enabled.
- * altbank
- */
- read_from_px_regs(0);
- read_from_px_regs_altbank(0);
- if (argc > 2) {
- puts(cmdtp->usage);
- return 1;
- }
- puts("Setting registers VCFGNE1, VBOOT, and VCTL\n");
- set_altbank();
- read_from_px_regs_altbank(1);
- puts("Resetting board to boot from the other bank.\n");
- set_px_go();
-
- } else if (strcmp(argv[2], "cf") == 0) {
- /*
- * Reset with frequency changed
- * altbank cf <SYSCLK freq> <COREPLL ratio>
- * <MPXPLL ratio>
- */
- read_from_px_regs(0);
- read_from_px_regs_altbank(0);
- val = set_px_sysclk(simple_strtoul(argv[3], NULL, 10));
- corepll = strfractoint((uchar *)argv[4]);
- val = val + set_px_corepll(corepll);
- val = val + set_px_mpxpll(simple_strtoul(argv[5],
- NULL, 10));
- if (val == 3) {
- puts("Setting registers VCFGEN0, VCFGEN1, VBOOT, and VCTL\n");
- set_altbank();
- read_from_px_regs(1);
- read_from_px_regs_altbank(1);
- puts("Enabling watchdog timer on the FPGA\n");
- puts("Resetting board with values from ");
- puts("VSPEED0, VSPEED1, VCLKH and VCLKL ");
- puts("to boot from the other bank.\n");
- set_px_go_with_watchdog();
- } else {
- puts(cmdtp->usage);
- return 1;
- }
+ unknown_param = 1;
+ }
- while (1) ; /* Not reached */
-
- } else if (strcmp(argv[2], "wd") == 0) {
- /*
- * Reset from alternate bank without changing
- * frequencies but with watchdog timer enabled:
- * altbank wd
- */
- read_from_px_regs(0);
- read_from_px_regs_altbank(0);
- puts("Setting registers VCFGEN1, VBOOT, and VCTL\n");
- set_altbank();
- read_from_px_regs_altbank(1);
- puts("Enabling watchdog timer on the FPGA\n");
- puts("Resetting board to boot from the other bank.\n");
- set_px_go_with_watchdog();
- while (1) ; /* Not reached */
-
- } else {
- puts(cmdtp->usage);
+ /*
+ * Check that cf has all required parms
+ */
+ if ((p_cf && !(p_cf_sysclk && p_cf_corepll && p_cf_mpxpll))
+ || unknown_param) {
+ puts(cmdtp->help);
+ return 1;
+ }
+
+ /*
+ * PIXIS seems to be sensitive to the ordering of
+ * the registers that are touched.
+ */
+ read_from_px_regs(0);
+
+ if (p_altbank) {
+ read_from_px_regs_altbank(0);
+ }
+ clear_altbank();
+
+ /*
+ * Clock configuration specified.
+ */
+ if (p_cf) {
+ unsigned long sysclk;
+ unsigned long corepll;
+ unsigned long mpxpll;
+
+ sysclk = simple_strtoul(p_cf_sysclk, NULL, 10);
+ corepll = strfractoint((uchar *) p_cf_corepll);
+ mpxpll = simple_strtoul(p_cf_mpxpll, NULL, 10);
+
+ if (!(set_px_sysclk(sysclk)
+ && set_px_corepll(corepll)
+ && set_px_mpxpll(mpxpll))) {
+ puts(cmdtp->help);
return 1;
}
+ read_from_px_regs(1);
+ }
+ /*
+ * Altbank specified
+ *
+ * NOTE CHANGE IN BEHAVIOR: previous code would default
+ * to enabling watchdog if altbank is specified.
+ * Now the watchdog must be enabled explicitly using 'wd'.
+ */
+ if (p_altbank) {
+ set_altbank();
+ read_from_px_regs_altbank(1);
+ }
+
+ /*
+ * Reset with watchdog specified.
+ */
+ if (p_wd) {
+ set_px_go_with_watchdog();
} else {
- puts(cmdtp->usage);
- return 1;
+ set_px_go();
}
+ /*
+ * Shouldn't be reached.
+ */
return 0;
}
--
1.5.2.1.126.g6abd0
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