v4.19.13 snapshot.
diff --git a/arch/arc/plat-hsdk/platform.c b/arch/arc/plat-hsdk/platform.c
new file mode 100644
index 0000000..2588b84
--- /dev/null
+++ b/arch/arc/plat-hsdk/platform.c
@@ -0,0 +1,138 @@
+/*
+ * ARC HSDK Platform support code
+ *
+ * Copyright (C) 2017 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <asm/arcregs.h>
+#include <asm/io.h>
+#include <asm/mach_desc.h>
+
+#define ARC_CCM_UNUSED_ADDR 0x60000000
+
+static void __init hsdk_init_per_cpu(unsigned int cpu)
+{
+ /*
+ * By default ICCM is mapped to 0x7z while this area is used for
+ * kernel virtual mappings, so move it to currently unused area.
+ */
+ if (cpuinfo_arc700[cpu].iccm.sz)
+ write_aux_reg(ARC_REG_AUX_ICCM, ARC_CCM_UNUSED_ADDR);
+
+ /*
+ * By default DCCM is mapped to 0x8z while this area is used by kernel,
+ * so move it to currently unused area.
+ */
+ if (cpuinfo_arc700[cpu].dccm.sz)
+ write_aux_reg(ARC_REG_AUX_DCCM, ARC_CCM_UNUSED_ADDR);
+}
+
+#define ARC_PERIPHERAL_BASE 0xf0000000
+#define CREG_BASE (ARC_PERIPHERAL_BASE + 0x1000)
+#define CREG_PAE (CREG_BASE + 0x180)
+#define CREG_PAE_UPDATE (CREG_BASE + 0x194)
+
+#define SDIO_BASE (ARC_PERIPHERAL_BASE + 0xA000)
+#define SDIO_UHS_REG_EXT (SDIO_BASE + 0x108)
+#define SDIO_UHS_REG_EXT_DIV_2 (2 << 30)
+
+#define HSDK_GPIO_INTC (ARC_PERIPHERAL_BASE + 0x3000)
+
+static void __init hsdk_enable_gpio_intc_wire(void)
+{
+ /*
+ * Peripherals on CPU Card are wired to cpu intc via intermediate
+ * DW APB GPIO blocks (mainly for debouncing)
+ *
+ * ---------------------
+ * | snps,archs-intc |
+ * ---------------------
+ * |
+ * ----------------------
+ * | snps,archs-idu-intc |
+ * ----------------------
+ * | | | | |
+ * | [eth] [USB] [... other peripherals]
+ * |
+ * -------------------
+ * | snps,dw-apb-intc |
+ * -------------------
+ * | | | |
+ * [Bt] [HAPS] [... other peripherals]
+ *
+ * Current implementation of "irq-dw-apb-ictl" driver doesn't work well
+ * with stacked INTCs. In particular problem happens if its master INTC
+ * not yet instantiated. See discussion here -
+ * https://lkml.org/lkml/2015/3/4/755
+ *
+ * So setup the first gpio block as a passive pass thru and hide it from
+ * DT hardware topology - connect intc directly to cpu intc
+ * The GPIO "wire" needs to be init nevertheless (here)
+ *
+ * One side adv is that peripheral interrupt handling avoids one nested
+ * intc ISR hop
+ *
+ * According to HSDK User's Manual [1], "Table 2 Interrupt Mapping"
+ * we have the following GPIO input lines used as sources of interrupt:
+ * - GPIO[0] - Bluetooth interrupt of RS9113 module
+ * - GPIO[2] - HAPS interrupt (on HapsTrak 3 connector)
+ * - GPIO[3] - Audio codec (MAX9880A) interrupt
+ * - GPIO[8-23] - Available on Arduino and PMOD_x headers
+ * For now there's no use of Arduino and PMOD_x headers in Linux
+ * use-case so we only enable lines 0, 2 and 3.
+ *
+ * [1] https://github.com/foss-for-synopsys-dwc-arc-processors/ARC-Development-Systems-Forum/wiki/docs/ARC_HSDK_User_Guide.pdf
+ */
+#define GPIO_INTEN (HSDK_GPIO_INTC + 0x30)
+#define GPIO_INTMASK (HSDK_GPIO_INTC + 0x34)
+#define GPIO_INTTYPE_LEVEL (HSDK_GPIO_INTC + 0x38)
+#define GPIO_INT_POLARITY (HSDK_GPIO_INTC + 0x3c)
+#define GPIO_INT_CONNECTED_MASK 0x0d
+
+ iowrite32(0xffffffff, (void __iomem *) GPIO_INTMASK);
+ iowrite32(~GPIO_INT_CONNECTED_MASK, (void __iomem *) GPIO_INTMASK);
+ iowrite32(0x00000000, (void __iomem *) GPIO_INTTYPE_LEVEL);
+ iowrite32(0xffffffff, (void __iomem *) GPIO_INT_POLARITY);
+ iowrite32(GPIO_INT_CONNECTED_MASK, (void __iomem *) GPIO_INTEN);
+}
+
+static void __init hsdk_init_early(void)
+{
+ /*
+ * PAE remapping for DMA clients does not work due to an RTL bug, so
+ * CREG_PAE register must be programmed to all zeroes, otherwise it
+ * will cause problems with DMA to/from peripherals even if PAE40 is
+ * not used.
+ */
+
+ /* Default is 1, which means "PAE offset = 4GByte" */
+ writel_relaxed(0, (void __iomem *) CREG_PAE);
+
+ /* Really apply settings made above */
+ writel(1, (void __iomem *) CREG_PAE_UPDATE);
+
+ /*
+ * Switch SDIO external ciu clock divider from default div-by-8 to
+ * minimum possible div-by-2.
+ */
+ iowrite32(SDIO_UHS_REG_EXT_DIV_2, (void __iomem *) SDIO_UHS_REG_EXT);
+
+ hsdk_enable_gpio_intc_wire();
+}
+
+static const char *hsdk_compat[] __initconst = {
+ "snps,hsdk",
+ NULL,
+};
+
+MACHINE_START(SIMULATION, "hsdk")
+ .dt_compat = hsdk_compat,
+ .init_early = hsdk_init_early,
+ .init_per_cpu = hsdk_init_per_cpu,
+MACHINE_END