arm: Add support for LEGO MINDSTORMS EV3
This is based on the davinci da850evm. It can boot from either the
on-board 16MB flash or from a microSD card. It also reads board
information from an I2C EEPROM.
The EV3 itself initally boots from write-protected EEPROM, so no
u-boot SPL is needed.
Signed-off-by: David Lechner <david@lechnology.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/lego/ev3/legoev3.c b/board/lego/ev3/legoev3.c
new file mode 100644
index 0000000..a791b97
--- /dev/null
+++ b/board/lego/ev3/legoev3.c
@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2016 David Lechner <david@lechnology.com>
+ *
+ * Based on da850evm.c
+ *
+ * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Based on da830evm.c. Original Copyrights follow:
+ *
+ * Copyright (C) 2009 Nick Thompson, GE Fanuc, Ltd. <nick.thompson@gefanuc.com>
+ * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <net.h>
+#include <netdev.h>
+#include <spi.h>
+#include <spi_flash.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/pinmux_defs.h>
+#include <asm/io.h>
+#include <asm/arch/davinci_misc.h>
+#include <asm/errno.h>
+#include <hwconfig.h>
+
+#ifdef CONFIG_DAVINCI_MMC
+#include <mmc.h>
+#include <asm/arch/sdmmc_defs.h>
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+u8 board_rev;
+
+#define EEPROM_I2C_ADDR 0x50
+#define EEPROM_REV_OFFSET 0x3F00
+#define EEPROM_MAC_OFFSET 0x3F06
+
+#ifdef CONFIG_DAVINCI_MMC
+static struct davinci_mmc mmc_sd0 = {
+ .reg_base = (struct davinci_mmc_regs *)DAVINCI_MMC_SD0_BASE,
+ .host_caps = MMC_MODE_4BIT, /* DA850 supports only 4-bit SD/MMC */
+ .voltages = MMC_VDD_32_33 | MMC_VDD_33_34,
+ .version = MMC_CTLR_VERSION_2,
+};
+
+int board_mmc_init(bd_t *bis)
+{
+ mmc_sd0.input_clk = clk_get(DAVINCI_MMCSD_CLKID);
+
+ /* Add slot-0 to mmc subsystem */
+ return davinci_mmc_init(bis, &mmc_sd0);
+}
+#endif
+
+const struct pinmux_resource pinmuxes[] = {
+ PINMUX_ITEM(spi0_pins_base),
+ PINMUX_ITEM(spi0_pins_scs0),
+ PINMUX_ITEM(uart1_pins_txrx),
+ PINMUX_ITEM(i2c0_pins),
+ PINMUX_ITEM(mmc0_pins),
+};
+
+const int pinmuxes_size = ARRAY_SIZE(pinmuxes);
+
+const struct lpsc_resource lpsc[] = {
+ { DAVINCI_LPSC_SPI0 }, /* Serial Flash */
+ { DAVINCI_LPSC_UART1 }, /* console */
+ { DAVINCI_LPSC_MMC_SD },
+};
+
+const int lpsc_size = ARRAY_SIZE(lpsc);
+
+u32 get_board_rev(void)
+{
+ u8 buf[2];
+
+ if (!board_rev) {
+ if (i2c_read(EEPROM_I2C_ADDR, EEPROM_REV_OFFSET, 2, buf, 2)) {
+ printf("\nBoard revision read failed!\n");
+ } else {
+ /*
+ * Board rev 3 has MAC address at EEPROM_REV_OFFSET.
+ * Other revisions have checksum at EEPROM_REV_OFFSET+1
+ * to detect this.
+ */
+ if ((buf[0] ^ buf[1]) == 0xFF)
+ board_rev = buf[0];
+ else
+ board_rev = 3;
+ }
+ }
+
+ return board_rev;
+}
+
+/*
+ * The Bluetooth MAC address serves as the board serial number.
+ */
+void get_board_serial(struct tag_serialnr *serialnr)
+{
+ u32 offset;
+ u8 buf[6];
+
+ if (!board_rev)
+ board_rev = get_board_rev();
+
+ /* Board rev 3 has MAC address where rev should be */
+ offset = (board_rev == 3) ? EEPROM_REV_OFFSET : EEPROM_MAC_OFFSET;
+
+ if (i2c_read(EEPROM_I2C_ADDR, offset, 2, buf, 6)) {
+ printf("\nBoard serial read failed!\n");
+ } else {
+ u8 *nr;
+
+ nr = (u8 *)&serialnr->low;
+ nr[0] = buf[5];
+ nr[1] = buf[4];
+ nr[2] = buf[3];
+ nr[3] = buf[2];
+ nr = (u8 *)&serialnr->high;
+ nr[0] = buf[1];
+ nr[1] = buf[0];
+ nr[2] = 0;
+ nr[3] = 0;
+ }
+}
+
+int board_early_init_f(void)
+{
+ /*
+ * Power on required peripherals
+ * ARM does not have access by default to PSC0 and PSC1
+ * assuming here that the DSP bootloader has set the IOPU
+ * such that PSC access is available to ARM
+ */
+ if (da8xx_configure_lpsc_items(lpsc, ARRAY_SIZE(lpsc)))
+ return 1;
+
+ return 0;
+}
+
+int board_init(void)
+{
+#ifndef CONFIG_USE_IRQ
+ irq_init();
+#endif
+
+ /* arch number of the board */
+ /* LEGO didn't register for a unique number and uses da850evm */
+ gd->bd->bi_arch_number = MACH_TYPE_DAVINCI_DA850_EVM;
+
+ /* address of boot parameters */
+ gd->bd->bi_boot_params = LINUX_BOOT_PARAM_ADDR;
+
+ /* setup the SUSPSRC for ARM to control emulation suspend */
+ writel(readl(&davinci_syscfg_regs->suspsrc) &
+ ~(DAVINCI_SYSCFG_SUSPSRC_EMAC | DAVINCI_SYSCFG_SUSPSRC_I2C |
+ DAVINCI_SYSCFG_SUSPSRC_SPI0 | DAVINCI_SYSCFG_SUSPSRC_TIMER0 |
+ DAVINCI_SYSCFG_SUSPSRC_UART1),
+ &davinci_syscfg_regs->suspsrc);
+
+ /* configure pinmux settings */
+ if (davinci_configure_pin_mux_items(pinmuxes, ARRAY_SIZE(pinmuxes)))
+ return 1;
+
+ /* enable the console UART */
+ writel((DAVINCI_UART_PWREMU_MGMT_FREE | DAVINCI_UART_PWREMU_MGMT_URRST |
+ DAVINCI_UART_PWREMU_MGMT_UTRST),
+ &davinci_uart1_ctrl_regs->pwremu_mgmt);
+
+ return 0;
+}