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>
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 @@
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 @@
#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 @@
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) {