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| author | Shaohui Xie <Shaohui.Xie@freescale.com> | 2011-09-13 17:55:11 +0800 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2011-10-03 08:30:02 -0500 |
| commit | 44d50f0b54ef14534440bc5d789ec65240dfc0f8 (patch) | |
| tree | 3abda67a24ea3aca853e69ef631d6837c6346329 /board | |
| parent | ba50fee6ae7e626bb2eda9d28403d7d3950f407a (diff) | |
| download | u-boot-imx-44d50f0b54ef14534440bc5d789ec65240dfc0f8.zip u-boot-imx-44d50f0b54ef14534440bc5d789ec65240dfc0f8.tar.gz u-boot-imx-44d50f0b54ef14534440bc5d789ec65240dfc0f8.tar.bz2 | |
powerpc/p2041rdb: set sysclk according to status of physical switch SW1
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@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'board')
| -rw-r--r-- | board/freescale/p2041rdb/cpld.h | 3 | ||||
| -rw-r--r-- | board/freescale/p2041rdb/p2041rdb.c | 14 |
2 files changed, 17 insertions, 0 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 6ed404f..6461bd7 100644 --- a/board/freescale/p2041rdb/p2041rdb.c +++ b/board/freescale/p2041rdb/p2041rdb.c @@ -130,6 +130,20 @@ 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) { |