powerpc/t4rdb: Add support of CPLD

This support of CPLD includes

    - Files and register definitions
    - Command to switch alternate bank
    - Command to switch default bank

Signed-off-by: Chunhe Lan <Chunhe.Lan@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

6 files changed, 206 insertions, 0 deletions

diff --git a/board/freescale/t4rdb/Makefile b/board/freescale/t4rdb/Makefile
index f7f7fc0..3886e3d 100644
--- a/board/freescale/t4rdb/Makefile
+++ b/board/freescale/t4rdb/Makefile
@@ -5,6 +5,7 @@
 #
 
 obj-$(CONFIG_T4240RDB) += t4240rdb.o
+obj-y	+= cpld.o
 obj-y	+= ddr.o
 obj-y	+= eth.o
 obj-$(CONFIG_PCI)	+= pci.o
diff --git a/board/freescale/t4rdb/cpld.c b/board/freescale/t4rdb/cpld.c
new file mode 100644
index 0000000..d5f3812
--- /dev/null
+++ b/board/freescale/t4rdb/cpld.c
@@ -0,0 +1,136 @@
+/**
+ * Copyright 2014 Freescale Semiconductor
+ *
+ * Author: Chunhe Lan <Chunhe.Lan@freescale.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * This file provides support for the board-specific CPLD used on some Freescale
+ * reference boards.
+ *
+ * The following macros need to be defined:
+ *
+ * CONFIG_SYS_CPLD_BASE - The virtual address of the base of the
+ * CPLD register map
+ *
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/io.h>
+
+#include "cpld.h"
+
+u8 cpld_read(unsigned int reg)
+{
+	void *p = (void *)CONFIG_SYS_CPLD_BASE;
+
+	return in_8(p + reg);
+}
+
+void cpld_write(unsigned int reg, u8 value)
+{
+	void *p = (void *)CONFIG_SYS_CPLD_BASE;
+
+	out_8(p + reg, value);
+}
+
+/**
+ * Set the boot bank to the alternate bank
+ */
+void cpld_set_altbank(void)
+{
+	u8 val, curbank, altbank, override;
+
+	val = CPLD_READ(vbank);
+	curbank = val & CPLD_BANK_SEL_MASK;
+
+	switch (curbank) {
+	case CPLD_SELECT_BANK0:
+		altbank = CPLD_SELECT_BANK4;
+		CPLD_WRITE(vbank, altbank);
+		override = CPLD_READ(software_on);
+		CPLD_WRITE(software_on, override | CPLD_BANK_SEL_EN);
+		CPLD_WRITE(sys_reset, CPLD_SYSTEM_RESET);
+		break;
+	case CPLD_SELECT_BANK4:
+		altbank = CPLD_SELECT_BANK0;
+		CPLD_WRITE(vbank, altbank);
+		override = CPLD_READ(software_on);
+		CPLD_WRITE(software_on, override | CPLD_BANK_SEL_EN);
+		CPLD_WRITE(sys_reset, CPLD_SYSTEM_RESET);
+		break;
+	default:
+		printf("CPLD Altbank Fail: Invalid value!\n");
+		return;
+	}
+}
+
+/**
+ * Set the boot bank to the default bank
+ */
+void cpld_set_defbank(void)
+{
+	u8 val;
+
+	val = CPLD_DEFAULT_BANK;
+
+	CPLD_WRITE(global_reset, val);
+}
+
+#ifdef DEBUG
+static void cpld_dump_regs(void)
+{
+	printf("chip_id1	= 0x%02x\n", CPLD_READ(chip_id1));
+	printf("chip_id2	= 0x%02x\n", CPLD_READ(chip_id2));
+	printf("sw_maj_ver	= 0x%02x\n", CPLD_READ(sw_maj_ver));
+	printf("sw_min_ver	= 0x%02x\n", CPLD_READ(sw_min_ver));
+	printf("hw_ver		= 0x%02x\n", CPLD_READ(hw_ver));
+	printf("software_on	= 0x%02x\n", CPLD_READ(software_on));
+	printf("cfg_rcw_src	= 0x%02x\n", CPLD_READ(cfg_rcw_src));
+	printf("res0		= 0x%02x\n", CPLD_READ(res0));
+	printf("vbank		= 0x%02x\n", CPLD_READ(vbank));
+	printf("sw1_sysclk	= 0x%02x\n", CPLD_READ(sw1_sysclk));
+	printf("sw2_status	= 0x%02x\n", CPLD_READ(sw2_status));
+	printf("sw3_status	= 0x%02x\n", CPLD_READ(sw3_status));
+	printf("sw4_status	= 0x%02x\n", CPLD_READ(sw4_status));
+	printf("sys_reset	= 0x%02x\n", CPLD_READ(sys_reset));
+	printf("global_reset	= 0x%02x\n", CPLD_READ(global_reset));
+	printf("res1		= 0x%02x\n", CPLD_READ(res1));
+	putc('\n');
+}
+#endif
+
+#ifndef CONFIG_SPL_BUILD
+int do_cpld(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	int rc = 0;
+
+	if (argc <= 1)
+		return cmd_usage(cmdtp);
+
+	if (strcmp(argv[1], "reset") == 0) {
+		if (strcmp(argv[2], "altbank") == 0)
+			cpld_set_altbank();
+		else
+			cpld_set_defbank();
+#ifdef DEBUG
+	} else if (strcmp(argv[1], "dump") == 0) {
+		cpld_dump_regs();
+#endif
+	} else
+		rc = cmd_usage(cmdtp);
+
+	return rc;
+}
+
+U_BOOT_CMD(
+	cpld, CONFIG_SYS_MAXARGS, 1, do_cpld,
+	"Reset the board or alternate bank",
+	"reset - reset to default bank\n"
+	"cpld reset altbank - reset to alternate bank\n"
+#ifdef DEBUG
+	"cpld dump - display the CPLD registers\n"
+#endif
+	);
+#endif
diff --git a/board/freescale/t4rdb/cpld.h b/board/freescale/t4rdb/cpld.h
new file mode 100644
index 0000000..0180082
--- /dev/null
+++ b/board/freescale/t4rdb/cpld.h
@@ -0,0 +1,49 @@
+/**
+ * Copyright 2014 Freescale Semiconductor
+ *
+ * Author: Chunhe Lan <Chunhe.Lan@freescale.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * This file provides support for the ngPIXIS, a board-specific FPGA used on
+ * some Freescale reference boards.
+ */
+
+/*
+ * CPLD register set. Feel free to add board-specific #ifdefs where necessary.
+ */
+struct cpld_data {
+	u8 chip_id1;	/* 0x00 - CPLD Chip ID1 Register */
+	u8 chip_id2;	/* 0x01 - CPLD Chip ID2 Register */
+	u8 sw_maj_ver;	/* 0x02 - CPLD Code Major Version Register */
+	u8 sw_min_ver;	/* 0x03 - CPLD Code Minor Version Register */
+	u8 hw_ver;	/* 0x04 - PCBA Version Register */
+	u8 software_on;	/* 0x05 - Override Physical Switch Enable Register */
+	u8 cfg_rcw_src;	/* 0x06 - RCW Source Location Control Register */
+	u8 res0;	/* 0x07 - not used */
+	u8 vbank;	/* 0x08 - Flash Bank Selection Control Register */
+	u8 sw1_sysclk;	/* 0x09 - SW1 Status Read Back Register */
+	u8 sw2_status;	/* 0x0a - SW2 Status Read Back Register */
+	u8 sw3_status;	/* 0x0b - SW3 Status Read Back Register */
+	u8 sw4_status;	/* 0x0c - SW4 Status Read Back Register */
+	u8 sys_reset;	/* 0x0d - Reset System With Reserving Registers Value*/
+	u8 global_reset;/* 0x0e - Reset System With Default Registers Value */
+	u8 res1;	/* 0x0f - not used */
+};
+
+#define CPLD_BANK_SEL_MASK	0x07
+#define CPLD_BANK_SEL_EN	0x04
+#define CPLD_SYSTEM_RESET	0x01
+#define CPLD_SELECT_BANK0	0x00
+#define CPLD_SELECT_BANK4	0x04
+#define CPLD_DEFAULT_BANK	0x01
+
+/* Pointer to the CPLD register set */
+
+u8 cpld_read(unsigned int reg);
+void cpld_write(unsigned int reg, u8 value);
+
+#define CPLD_READ(reg) cpld_read(offsetof(struct cpld_data, reg))
+#define CPLD_WRITE(reg, value) \
+		cpld_write(offsetof(struct cpld_data, reg), value)
+
diff --git a/board/freescale/t4rdb/law.c b/board/freescale/t4rdb/law.c
index 1f58768..39818fc 100644
--- a/board/freescale/t4rdb/law.c
+++ b/board/freescale/t4rdb/law.c
@@ -16,6 +16,9 @@ struct law_entry law_table[] = {
 #ifdef CONFIG_SYS_QMAN_MEM_PHYS
 	SET_LAW(CONFIG_SYS_QMAN_MEM_PHYS, LAW_SIZE_32M, LAW_TRGT_IF_QMAN),
 #endif
+#ifdef CONFIG_SYS_CPLD_BASE_PHYS
+	SET_LAW(CONFIG_SYS_CPLD_BASE_PHYS, LAW_SIZE_4K, LAW_TRGT_IF_IFC),
+#endif
 #ifdef CONFIG_SYS_DCSRBAR_PHYS
 	/* Limit DCSR to 32M to access NPC Trace Buffer */
 	SET_LAW(CONFIG_SYS_DCSRBAR_PHYS, LAW_SIZE_32M, LAW_TRGT_IF_DCSR),
diff --git a/board/freescale/t4rdb/t4240rdb.c b/board/freescale/t4rdb/t4240rdb.c
index afef7e9..2ff77b8 100644
--- a/board/freescale/t4rdb/t4240rdb.c
+++ b/board/freescale/t4rdb/t4240rdb.c
@@ -20,14 +20,26 @@
 #include <fm_eth.h>
 
 #include "t4rdb.h"
+#include "cpld.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
 int checkboard(void)
 {
 	struct cpu_type *cpu = gd->arch.cpu;
+	u8 sw;
 
 	printf("Board: %sRDB, ", cpu->name);
+	printf("Board rev: 0x%02x CPLD ver: 0x%02x%02x, ",
+	       CPLD_READ(hw_ver), CPLD_READ(sw_maj_ver), CPLD_READ(sw_min_ver));
+
+	sw = CPLD_READ(vbank);
+	sw = sw & CPLD_BANK_SEL_MASK;
+
+	if (sw <= 7)
+		printf("vBank: %d\n", sw);
+	else
+		printf("Unsupported Bank=%x\n", sw);
 
 	puts("SERDES Reference Clocks:\n");
 	printf("       SERDES1=100MHz SERDES2=156.25MHz\n"
diff --git a/board/freescale/t4rdb/tlb.c b/board/freescale/t4rdb/tlb.c
index 4b50bcd..474301e 100644
--- a/board/freescale/t4rdb/tlb.c
+++ b/board/freescale/t4rdb/tlb.c
@@ -106,6 +106,11 @@ struct fsl_e_tlb_entry tlb_table[] = {
 		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
 		      0, 16, BOOKE_PAGESZ_64K, 1),
 #endif
+#ifdef CONFIG_SYS_CPLD_BASE
+	SET_TLB_ENTRY(1, CONFIG_SYS_CPLD_BASE, CONFIG_SYS_CPLD_BASE_PHYS,
+		      MAS3_SW|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
+		      0, 17, BOOKE_PAGESZ_4K, 1),
+#endif
 };
 
 int num_tlb_entries = ARRAY_SIZE(tlb_table);