[U-Boot] [PATCH 2/2] powerpc/p2041: set sysclk according to status of physical switch SW1
Shaohui Xie
Shaohui.Xie at freescale.com
Thu Sep 15 10:25:19 CEST 2011
P2041RDB supports 3 sysclk frequencies, it's selected by SW1[6~8], software
need to read the SW1 status to decide what the sysclk needs.
SW1[8~6] : frequency
0 0 1 : 83.3MHz
0 1 0 : 100MHz
others: 66.667MHz
Signed-off-by: Shaohui Xie <Shaohui.Xie at freescale.com>
---
board/freescale/p2041rdb/cpld.h | 3 +++
board/freescale/p2041rdb/p2041rdb.c | 14 ++++++++++++++
include/configs/P2041RDB.h | 5 ++++-
3 files changed, 21 insertions(+), 1 deletions(-)
diff --git a/board/freescale/p2041rdb/cpld.h b/board/freescale/p2041rdb/cpld.h
index dcdb410..bece5dd 100644
--- a/board/freescale/p2041rdb/cpld.h
+++ b/board/freescale/p2041rdb/cpld.h
@@ -30,6 +30,7 @@ typedef struct cpld_data {
u8 serdes_mux; /* 0xc - Multiplexed pin Select Register */
u8 sw[1]; /* 0xd - SW2 Status */
u8 system_rst_default; /* 0xe - system reset to default register */
+ u8 sysclk_sw1; /* 0xf - sysclk configuration register */
} __attribute__ ((packed)) cpld_data_t;
#define SERDES_MUX_LANE_6_MASK 0x2
@@ -41,6 +42,8 @@ typedef struct cpld_data {
#define SERDES_MUX_LANE_D_MASK 0x8
#define SERDES_MUX_LANE_D_SHIFT 3
#define CPLD_SWITCH_BANK_ENABLE 0x40
+#define CPLD_SYSCLK_83 0x1 /* system clock 83.3MHz */
+#define CPLD_SYSCLK_100 0x2 /* system clock 100MHz */
/* Pointer to the CPLD register set */
#define cpld ((cpld_data_t *)CPLD_BASE)
diff --git a/board/freescale/p2041rdb/p2041rdb.c b/board/freescale/p2041rdb/p2041rdb.c
index 52269d3..8685a29 100644
--- a/board/freescale/p2041rdb/p2041rdb.c
+++ b/board/freescale/p2041rdb/p2041rdb.c
@@ -129,6 +129,20 @@ int board_early_init_r(void)
return 0;
}
+unsigned long get_board_sys_clk(unsigned long dummy)
+{
+ u8 sysclk_conf = CPLD_READ(sysclk_sw1);
+
+ switch (sysclk_conf & 0x7) {
+ case CPLD_SYSCLK_83:
+ return 83333333;
+ case CPLD_SYSCLK_100:
+ return 100000000;
+ default:
+ return 66666666;
+ }
+}
+
static const char *serdes_clock_to_string(u32 clock)
{
switch (clock) {
diff --git a/include/configs/P2041RDB.h b/include/configs/P2041RDB.h
index 638dbe7..382f1fc 100644
--- a/include/configs/P2041RDB.h
+++ b/include/configs/P2041RDB.h
@@ -102,7 +102,10 @@
#define CONFIG_ENV_SECT_SIZE 0x20000 /* 128K (one sector) */
#endif
-#define CONFIG_SYS_CLK_FREQ 66666666
+#ifndef __ASSEMBLY__
+unsigned long get_board_sys_clk(unsigned long dummy);
+#endif
+#define CONFIG_SYS_CLK_FREQ get_board_sys_clk(0)
/*
* These can be toggled for performance analysis, otherwise use default.
--
1.6.4
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