1 files changed, 167 insertions, 0 deletions
diff --git a/board/renesas/ulcb/cpld.c b/board/renesas/ulcb/cpld.c
new file mode 100644
index 0000000..f9384b0
--- /dev/null
+++ b/board/renesas/ulcb/cpld.c
@@ -0,0 +1,167 @@
+/*
+ * ULCB board CPLD access support
+ *
+ * Copyright (C) 2017 Renesas Electronics Corporation
+ * Copyright (C) 2017 Cogent Embedded, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <spi.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+#define SCLK			GPIO_GP_6_8
+#define SSTBZ			GPIO_GP_2_3
+#define MOSI			GPIO_GP_6_7
+#define MISO			GPIO_GP_6_10
+
+#define CPLD_ADDR_MODE		0x00 /* RW */
+#define CPLD_ADDR_MUX		0x02 /* RW */
+#define CPLD_ADDR_DIPSW6	0x08 /* R */
+#define CPLD_ADDR_RESET		0x80 /* RW */
+#define CPLD_ADDR_VERSION	0xFF /* R */
+
+static int cpld_initialized;
+
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+	/* Always valid */
+	return 1;
+}
+
+void spi_cs_activate(struct spi_slave *slave)
+{
+	/* Always active */
+}
+
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+	/* Always active */
+}
+
+void ulcb_softspi_sda(int set)
+{
+	gpio_set_value(MOSI, set);
+}
+
+void ulcb_softspi_scl(int set)
+{
+	gpio_set_value(SCLK, set);
+}
+
+unsigned char ulcb_softspi_read(void)
+{
+	return !!gpio_get_value(MISO);
+}
+
+static void cpld_rw(u8 write)
+{
+	gpio_set_value(MOSI, write);
+	gpio_set_value(SSTBZ, 0);
+	gpio_set_value(SCLK, 1);
+	gpio_set_value(SCLK, 0);
+	gpio_set_value(SSTBZ, 1);
+}
+
+static u32 cpld_read(u8 addr)
+{
+	u32 data = 0;
+
+	spi_xfer(NULL, 8, &addr, NULL, SPI_XFER_BEGIN | SPI_XFER_END);
+
+	cpld_rw(0);
+
+	spi_xfer(NULL, 32, NULL, &data, SPI_XFER_BEGIN | SPI_XFER_END);
+
+	return swab32(data);
+}
+
+static void cpld_write(u8 addr, u32 data)
+{
+	data = swab32(data);
+
+	spi_xfer(NULL, 32, &data, NULL, SPI_XFER_BEGIN | SPI_XFER_END);
+
+	spi_xfer(NULL, 8, NULL, &addr, SPI_XFER_BEGIN | SPI_XFER_END);
+
+	cpld_rw(1);
+}
+
+static void cpld_init(void)
+{
+	if (cpld_initialized)
+		return;
+
+	/* PULL-UP on MISO line */
+	setbits_le32(PFC_PUEN5, PUEN_SSI_SDATA4);
+
+	gpio_request(SCLK, NULL);
+	gpio_request(SSTBZ, NULL);
+	gpio_request(MOSI, NULL);
+	gpio_request(MISO, NULL);
+
+	gpio_direction_output(SCLK, 0);
+	gpio_direction_output(SSTBZ, 1);
+	gpio_direction_output(MOSI, 0);
+	gpio_direction_input(MISO);
+
+	/* Dummy read */
+	cpld_read(CPLD_ADDR_VERSION);
+
+	cpld_initialized = 1;
+}
+
+static int do_cpld(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	u32 addr, val;
+
+	cpld_init();
+
+	if (argc == 2 && strcmp(argv[1], "info") == 0) {
+		printf("CPLD version:\t\t\t0x%08x\n",
+		       cpld_read(CPLD_ADDR_VERSION));
+		printf("H3 Mode setting (MD0..28):\t0x%08x\n",
+		       cpld_read(CPLD_ADDR_MODE));
+		printf("Multiplexer settings:\t\t0x%08x\n",
+		       cpld_read(CPLD_ADDR_MUX));
+		printf("DIPSW (SW6):\t\t\t0x%08x\n",
+		       cpld_read(CPLD_ADDR_DIPSW6));
+		return 0;
+	}
+
+	if (argc < 3)
+		return CMD_RET_USAGE;
+
+	addr = simple_strtoul(argv[2], NULL, 16);
+	if (!(addr == CPLD_ADDR_VERSION || addr == CPLD_ADDR_MODE ||
+	      addr == CPLD_ADDR_MUX || addr == CPLD_ADDR_DIPSW6 ||
+	      addr == CPLD_ADDR_RESET)) {
+		printf("Invalid CPLD register address\n");
+		return CMD_RET_USAGE;
+	}
+
+	if (argc == 3 && strcmp(argv[1], "read") == 0) {
+		printf("0x%x\n", cpld_read(addr));
+	} else if (argc == 4 && strcmp(argv[1], "write") == 0) {
+		val = simple_strtoul(argv[3], NULL, 16);
+		cpld_write(addr, val);
+	}
+
+	return 0;
+}
+
+U_BOOT_CMD(
+	cpld, 4, 1, do_cpld,
+	"CPLD access",
+	"info\n"
+	"cpld read addr\n"
+	"cpld write addr val\n"
+);
+
+void reset_cpu(ulong addr)
+{
+	cpld_init();
+	cpld_write(CPLD_ADDR_RESET, 1);
+}