mvebu: ds414: Implement Synology specific command set

Synology keeps per item configuration in a dedicated 'partition' in SPI
flash, namely the one named 'vendor' in DTS file. It contains the two
NICs MAC addresses as well as the item's serial number. I didn't find a
way to have this information extracted automatically, therefore
implemented 'syno populate_env' command which extracts the three values
and puts them into environment. To make things permanent though, one has
to 'saveenv'.

Another command is 'syno clk_gate', which allows to change the clock
gating which is done in DS414 board file.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Stefan Roese <sr@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>

board/Synology/common/Makefile

+#
+# Copyright (C) 2015 Phil Sutter <phil@nwl.cc>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y :=	cmd_syno.o

board/Synology/common/cmd_syno.c

+/*
+ * Commands to deal with Synology specifics.
+ *
+ * Copyright (C) 2015  Phil Sutter <phil@nwl.cc>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <div64.h>
+#include <spi.h>
+#include <spi_flash.h>
+#include <linux/mtd/mtd.h>
+
+#include <asm/io.h>
+#include "../drivers/ddr/marvell/axp/ddr3_init.h"
+
+#define ETH_ALEN		6
+#define ETHADDR_MAX		4
+#define SYNO_SN_TAG		"SN="
+#define SYNO_CHKSUM_TAG		"CHK="
+
+
+static int do_syno_populate(int argc, char * const argv[])
+{
+	unsigned int bus = CONFIG_SF_DEFAULT_BUS;
+	unsigned int cs = CONFIG_SF_DEFAULT_CS;
+	unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
+	unsigned int mode = CONFIG_SF_DEFAULT_MODE;
+	struct spi_flash *flash;
+	unsigned long addr = 0x80000; /* XXX: parameterize this? */
+	loff_t offset = 0x007d0000;
+	loff_t len = 0x00010000;
+	char *buf, *bufp;
+	char var[128];
+	char val[128];
+	int ret, n;
+
+	/* XXX: arg parsing to select flash here? */
+
+	flash = spi_flash_probe(bus, cs, speed, mode);
+	if (!flash) {
+		printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
+		return 1;
+	}
+
+	buf = map_physmem(addr, len, MAP_WRBACK);
+	if (!buf) {
+		puts("Failed to map physical memory\n");
+		return 1;
+	}
+
+	ret = spi_flash_read(flash, offset, len, buf);
+	if (ret) {
+		puts("Failed to read from SPI flash\n");
+		goto out_unmap;
+	}
+
+	for (n = 0; n < ETHADDR_MAX; n++) {
+		char ethaddr[ETH_ALEN];
+		int i, sum = 0;
+		unsigned char csum = 0;
+
+		for (i = 0, bufp = buf + n * 7; i < ETH_ALEN; i++) {
+			sum += bufp[i];
+			csum += bufp[i];
+			ethaddr[i] = bufp[i];
+		}
+		if (!sum)		/* MAC address empty */
+			continue;
+		if (csum != bufp[i]) {	/* seventh byte is checksum value */
+			printf("Invalid MAC address for interface %d!\n", n);
+			continue;
+		}
+		if (n == 0)
+			sprintf(var, "ethaddr");
+		else
+			sprintf(var, "eth%daddr", n);
+		snprintf(val, sizeof(val) - 1,
+		         "%02x:%02x:%02x:%02x:%02x:%02x",
+		         ethaddr[0], ethaddr[1], ethaddr[2],
+			 ethaddr[3], ethaddr[4], ethaddr[5]);
+		printf("parsed %s = %s\n", var, val);
+		setenv(var, val);
+	}
+	if (!strncmp(buf + 32, SYNO_SN_TAG, strlen(SYNO_SN_TAG))) {
+		char *snp, *csump;
+		int csum = 0;
+		unsigned long c;
+
+		snp = bufp = buf + 32 + strlen(SYNO_SN_TAG);
+		for (n = 0; bufp[n] && bufp[n] != ','; n++)
+			csum += bufp[n];
+		bufp[n] = '\0';
+
+		/* should come right after, but you never know */
+		bufp = strstr(bufp + n + 1, SYNO_CHKSUM_TAG);
+		if (!bufp) {
+			printf("Serial number checksum tag missing!\n");
+			goto out_unmap;
+		}
+
+		csump = bufp += strlen(SYNO_CHKSUM_TAG);
+		for (n = 0; bufp[n] && bufp[n] != ','; n++)
+			;
+		bufp[n] = '\0';
+
+		if (strict_strtoul(csump, 10, &c) || c != csum) {
+			puts("Invalid serial number found!\n");
+			ret = 1;
+			goto out_unmap;
+		}
+		printf("parsed SN = %s\n", snp);
+		setenv("SN", snp);
+	} else {	/* old style format */
+		unsigned char csum = 0;
+
+		for (n = 0, bufp = buf + 32; n < 10; n++)
+			csum += bufp[n];
+
+		if (csum != bufp[n]) {
+			puts("Invalid serial number found!\n");
+			ret = 1;
+			goto out_unmap;
+		}
+		bufp[n] = '\0';
+		printf("parsed SN = %s\n", buf + 32);
+		setenv("SN", buf + 32);
+	}
+out_unmap:
+	unmap_physmem(buf, len);
+	return ret;
+}
+
+/* map bit position to function in POWER_MNG_CTRL_REG */
+static const char * const pwr_mng_bit_func[] = {
+	"audio",
+	"ge3", "ge2", "ge1", "ge0",
+	"pcie00", "pcie01", "pcie02", "pcie03",
+	"pcie10", "pcie11", "pcie12", "pcie13",
+	"bp",
+	"sata0_link", "sata0_core",
+	"lcd",
+	"sdio",
+	"usb0", "usb1", "usb2",
+	"idma", "xor0", "crypto",
+	NULL,
+	"tdm",
+	"pcie20", "pcie30",
+	"xor1",
+	"sata1_link", "sata1_core",
+	NULL,
+};
+
+static int do_syno_clk_gate(int argc, char * const argv[])
+{
+	u32 pwr_mng_ctrl_reg = reg_read(POWER_MNG_CTRL_REG);
+	const char *func, *state;
+	int i, val;
+
+	if (argc < 2)
+		return -1;
+
+	if (!strcmp(argv[1], "get")) {
+		puts("Clock Gating:\n");
+		for (i = 0; i < 32; i++) {
+			func = pwr_mng_bit_func[i];
+			if (!func)
+				continue;
+			state = pwr_mng_ctrl_reg & (1 << i) ?  "ON" : "OFF";
+			printf("%s:\t\t%s\n", func, state);
+		}
+		return 0;
+	}
+	if (argc < 4)
+		return -1;
+	if (!strcmp(argv[1], "set")) {
+		func = argv[2];
+		state = argv[3];
+		for (i = 0; i < 32; i++) {
+			if (!pwr_mng_bit_func[i])
+				continue;
+			if (!strcmp(func, pwr_mng_bit_func[i]))
+				break;
+		}
+		if (i == 32) {
+			printf("Error: name '%s' not known\n", func);
+			return -1;
+		}
+		val = state[0] != '0';
+		pwr_mng_ctrl_reg |= (val << i);
+		pwr_mng_ctrl_reg &= ~(!val << i);
+		reg_write(POWER_MNG_CTRL_REG, pwr_mng_ctrl_reg);
+	}
+	return 0;
+}
+
+static int do_syno(cmd_tbl_t *cmdtp, int flag,
+                   int argc, char * const argv[])
+{
+	const char *cmd;
+	int ret = 0;
+
+	if (argc < 2)
+		goto usage;
+
+	cmd = argv[1];
+	--argc;
+	++argv;
+
+	if (!strcmp(cmd, "populate_env"))
+		ret = do_syno_populate(argc, argv);
+	else if (!strcmp(cmd, "clk_gate"))
+		ret = do_syno_clk_gate(argc, argv);
+
+	if (ret != -1)
+		return ret;
+usage:
+	return CMD_RET_USAGE;
+}
+
+U_BOOT_CMD(
+	syno, 5, 1, do_syno,
+	"Synology specific commands",
+	"populate_env                 - Read vendor data from SPI flash into environment\n"
+	"clk_gate (get|set name 1|0)  - Manage clock gating\n"
+);