powerpc/p2041rdb: update cpld reset command according to CPLD 2.0

CPLD 2.0 provides a new register which bit[0] is set to '1' will reset
board with initializing the CPLD registers to default values. And add
bit[6] of register at offset 0x5 to use to enable flash bank selection.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

board/freescale/p2041rdb/cpld.c

@@ -53,7 +53,11 @@ void cpld_reset(void) __attribute__((weak, alias("__cpld_reset")));
  */
 void __cpld_set_altbank(void)
 {
+	u8 reg5 = CPLD_READ(sw_ctl_on);
+
+	CPLD_WRITE(sw_ctl_on, reg5 | CPLD_SWITCH_BANK_ENABLE);
 	CPLD_WRITE(fbank_sel, 1);
+	CPLD_WRITE(system_rst, 1);
 }
 void cpld_set_altbank(void)
 	__attribute__((weak, alias("__cpld_set_altbank")));
@@ -61,12 +65,12 @@ void cpld_set_altbank(void)
 /**
  * Set the boot bank to the default bank
  */
-void __cpld_clear_altbank(void)
+void __cpld_set_defbank(void)
 {
-	CPLD_WRITE(fbank_sel, 0);
+	CPLD_WRITE(system_rst_default, 1);
 }
-void cpld_clear_altbank(void)
-	__attribute__((weak, alias("__cpld_clear_altbank")));
+void cpld_set_defbank(void)
+	__attribute__((weak, alias("__cpld_set_defbank")));
 
 #ifdef DEBUG
 static void cpld_dump_regs(void)
@@ -101,9 +105,7 @@ int cpld_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		if (strcmp(argv[2], "altbank") == 0)
 			cpld_set_altbank();
 		else
-			cpld_clear_altbank();
-
-		cpld_reset();
+			cpld_set_defbank();
 	} else if (strcmp(argv[1], "watchdog") == 0) {
 		static char *period[8] = {"1ms", "10ms", "30ms", "disable",
 			"100ms", "1s", "10s", "60s"};

board/freescale/p2041rdb/cpld.h

@@ -29,6 +29,7 @@ typedef struct cpld_data {
 	u8 fbank_sel;		/* 0xb - Flash bank selection */
 	u8 serdes_mux;		/* 0xc - Multiplexed pin Select Register */
 	u8 sw[1];		/* 0xd - SW2 Status */
+	u8 system_rst_default;	/* 0xe - system reset to default register */
 } __attribute__ ((packed)) cpld_data_t;
 
 #define SERDES_MUX_LANE_6_MASK	0x2
@@ -39,6 +40,7 @@ typedef struct cpld_data {
 #define SERDES_MUX_LANE_C_SHIFT	2
 #define SERDES_MUX_LANE_D_MASK	0x8
 #define SERDES_MUX_LANE_D_SHIFT	3
+#define CPLD_SWITCH_BANK_ENABLE	0x40
 
 /* Pointer to the CPLD register set */
 #define cpld ((cpld_data_t *)CPLD_BASE)