Merge tag 'arc-more-updates-for-2018.11-rc2-2' of git://git.denx.de/u-boot-arc

More fixes and improvements for ARC here:

Fixes (this time included for real):
 * Take care of global uninitialized variables
   They used to be put right after .bss section and were never
   zeroed as they should be. Now merged with normal .bss

Improvements:
 * Print more verbose CPU info for boards built on real silicon
 * Add support for SD-card detection on all ARC boards
 * Quite a few fixes for IoT DK
   - Support reset by command
   - Print of CPU freq on boot
   - Link for eFlash etc

arch/arc/config.mk

@@ -43,7 +43,7 @@ PLATFORM_CPPFLAGS += -mcpu=archs
 endif
 
 PLATFORM_CPPFLAGS += -ffixed-r25 -D__ARC__ -gdwarf-2 -mno-sdata
-PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
+PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections -fno-common
 
 # Needed for relocation
 LDFLAGS_FINAL += -pie --gc-sections

arch/arc/lib/cpu.c

@@ -60,7 +60,7 @@ const char *decode_identity(void)
 	}
 }
 
-int print_cpuinfo(void)
+__weak int print_cpuinfo(void)
 {
 	printf("CPU:   %s\n", decode_identity());
 	return 0;

board/synopsys/axs10x/axs10x.c

@@ -33,6 +33,13 @@ int board_mmc_init(bd_t *bis)
 	return 0;
 }
 
+int board_mmc_getcd(struct mmc *mmc)
+{
+	struct dwmci_host *host = mmc->priv;
+
+	return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
+}
+
 #define AXS_MB_CREG	0xE0011000
 
 int board_early_init_f(void)

board/synopsys/emdk/emdk.c

@@ -34,6 +34,13 @@ int board_mmc_init(bd_t *bis)
 	return 0;
 }
 
+int board_mmc_getcd(struct mmc *mmc)
+{
+	struct dwmci_host *host = mmc->priv;
+
+	return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
+}
+
 #define CREG_BASE		0xF0001000
 #define CREG_BOOT_OFFSET	0
 #define CREG_BOOT_WP_OFFSET	8

board/synopsys/hsdk/hsdk.c

@@ -1019,6 +1019,13 @@ int board_late_init(void)
 	return 0;
 }
 
+int board_mmc_getcd(struct mmc *mmc)
+{
+	struct dwmci_host *host = mmc->priv;
+
+	return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
+}
+
 int board_mmc_init(bd_t *bis)
 {
 	struct dwmci_host *host = NULL;
@@ -1046,3 +1053,11 @@ int board_mmc_init(bd_t *bis)
 
 	return 0;
 }
+
+#ifdef CONFIG_DISPLAY_CPUINFO
+int print_cpuinfo(void)
+{
+	printf("CPU:   ARC HS38 v2.1c\n");
+	return 0;
+}
+#endif /* CONFIG_DISPLAY_CPUINFO */

board/synopsys/iot_devkit/iot_devkit.c

@@ -17,6 +17,7 @@ DECLARE_GLOBAL_DATA_PTR;
 #define AHBCKDIV	(void *)(SYSCON_BASE + 0x04)
 #define APBCKDIV	(void *)(SYSCON_BASE + 0x08)
 #define APBCKEN		(void *)(SYSCON_BASE + 0x0C)
+#define RESET_REG	(void *)(SYSCON_BASE + 0x18)
 #define CLKSEL		(void *)(SYSCON_BASE + 0x24)
 #define CLKSTAT		(void *)(SYSCON_BASE + 0x28)
 #define PLLCON		(void *)(SYSCON_BASE + 0x2C)
@@ -67,6 +68,14 @@ static int set_cpu_freq(unsigned int clk)
 		writel((readl(PLLCON) & PLL_MASK_2) | 0x200191, PLLCON);
 		break;
 
+	case 136:
+		writel(readl(PLLCON) & PLL_MASK_0, PLLCON);
+		/* pll_off=1, M=17, N=1, OD=1, PLL_OUT_CLK=136M */
+		writel((readl(PLLCON) & PLL_MASK_1) | 0x100111, PLLCON);
+		/* pll_off=0, M=17, N=1, OD=1, PLL_OUT_CLK=136M */
+		writel((readl(PLLCON) & PLL_MASK_2) | 0x100111, PLLCON);
+		break;
+
 	case 144:
 		writel(readl(PLLCON) & PLL_MASK_0, PLLCON);
 		/* pll_off=1, M=18, N=1, OD=1, PLL_OUT_CLK=144M */
@@ -99,7 +108,7 @@ extern u8 __ram_end[];
  */
 int mach_cpu_init(void)
 {
-	int offset, freq;
+	int offset;
 
 	/* Don't relocate U-Boot */
 	gd->flags |= GD_FLG_SKIP_RELOC;
@@ -120,12 +129,12 @@ int mach_cpu_init(void)
 	if (offset < 0)
 		return offset;
 
-	freq = fdtdec_get_int(gd->fdt_blob, offset, "clock-frequency", 0);
-	if (!freq)
+	gd->cpu_clk = fdtdec_get_int(gd->fdt_blob, offset, "clock-frequency", 0);
+	if (!gd->cpu_clk)
 		return -EINVAL;
 
 	/* If CPU freq > 100 MHz, divide eFLASH clock by 2 */
-	if (freq > 100000000) {
+	if (gd->cpu_clk > 100000000) {
 		u32 reg = readl(AHBCKDIV);
 
 		reg &= ~(0xF << 8);
@@ -133,7 +142,7 @@ int mach_cpu_init(void)
 		writel(reg, AHBCKDIV);
 	}
 
-	return set_cpu_freq(freq);
+	return set_cpu_freq(gd->cpu_clk);
 }
 
 #define ARC_PERIPHERAL_BASE	0xF0000000
@@ -161,8 +170,32 @@ int board_mmc_init(bd_t *bis)
 	return 0;
 }
 
+int board_mmc_getcd(struct mmc *mmc)
+{
+	struct dwmci_host *host = mmc->priv;
+
+	return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
+}
+
+#define IOTDK_RESET_SEQ		0x55AA6699
+
+void reset_cpu(ulong addr)
+{
+	writel(IOTDK_RESET_SEQ, RESET_REG);
+}
+
 int checkboard(void)
 {
 	puts("Board: Synopsys IoT Development Kit\n");
 	return 0;
 };
+
+#ifdef CONFIG_DISPLAY_CPUINFO
+int print_cpuinfo(void)
+{
+	char mhz[8];
+
+	printf("CPU:   ARC EM9D at %s MHz\n", strmhz(mhz, gd->cpu_clk));
+	return 0;
+}
+#endif /* CONFIG_DISPLAY_CPUINFO */

configs/iot_devkit_defconfig

@@ -4,8 +4,9 @@ CONFIG_CPU_ARCEM6=y
 CONFIG_SYS_ICACHE_OFF=y
 CONFIG_SYS_DCACHE_OFF=y
 CONFIG_TARGET_IOT_DEVKIT=y
-CONFIG_SYS_TEXT_BASE=0x20000000
+CONFIG_SYS_TEXT_BASE=0x00000000
 CONFIG_SYS_CLK_FREQ=16000000
+CONFIG_LOCALVERSION="-iotdk-1.0"
 # CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
 CONFIG_SYS_PROMPT="IoTDK# "
 # CONFIG_CMD_BOOTD is not set
@@ -17,7 +18,6 @@ CONFIG_SYS_PROMPT="IoTDK# "
 # CONFIG_CMD_LOADS is not set
 CONFIG_CMD_MMC=y
 CONFIG_CMD_USB=y
-# CONFIG_CMD_NET is not set
 CONFIG_CMD_FAT=y
 CONFIG_OF_CONTROL=y
 CONFIG_OF_EMBED=y
@@ -25,6 +25,7 @@ CONFIG_DEFAULT_DEVICE_TREE="iot_devkit"
 CONFIG_ENV_IS_IN_FAT=y
 CONFIG_ENV_FAT_INTERFACE="mmc"
 CONFIG_ENV_FAT_DEVICE_AND_PART="0:1"
+# CONFIG_NET is not set
 CONFIG_DM=y
 CONFIG_MMC=y
 CONFIG_MMC_DW=y