x86: Add basic Intel Quark processor support

Add minimum codes to support Intel Quark SoC. DRAM initialization
is not ready yet so a hardcoded gd->ram_size is assigned.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

arch/x86/cpu/quark/Kconfig

@@ -0,0 +1,121 @@
+#
+# Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+config INTEL_QUARK
+	bool
+	select HAVE_RMU
+
+if INTEL_QUARK
+
+config HAVE_RMU
+	bool "Add a Remote Management Unit (RMU) binary"
+	help
+	  Select this option to add a Remote Management Unit (RMU) binary
+	  to the resulting U-Boot image. It is a data block (up to 64K) of
+	  machine-specific code which must be put in the flash for the RMU
+	  within the Quark SoC processor to access when powered up before
+	  system BIOS is executed.
+
+config RMU_FILE
+	string "Remote Management Unit (RMU) binary filename"
+	depends on HAVE_RMU
+	default "rmu.bin"
+	help
+	  The filename of the file to use as Remote Management Unit (RMU)
+	  binary in the board directory.
+
+config RMU_ADDR
+	hex "Remote Management Unit (RMU) binary location"
+	depends on HAVE_RMU
+	default 0xfff00000
+	help
+	  The location of the RMU binary is determined by a strap. It must be
+	  put in flash at a location matching the strap-determined base address.
+
+	  The default base address of 0xfff00000 indicates that the binary must
+	  be located at offset 0 from the beginning of a 1MB flash device.
+
+config HAVE_CMC
+	bool
+	default HAVE_RMU
+
+config CMC_FILE
+	string
+	depends on HAVE_CMC
+	default RMU_FILE
+
+config CMC_ADDR
+	hex
+	depends on HAVE_CMC
+	default RMU_ADDR
+
+config ESRAM_BASE
+	hex
+	default 0x80000000
+	help
+	  Embedded SRAM (eSRAM) memory-mapped base address.
+
+config PCIE_ECAM_BASE
+	hex
+	default 0xe0000000
+
+config RCBA_BASE
+	hex
+	default 0xfed1c000
+	help
+	  Root Complex register block memory-mapped base address.
+
+config ACPI_PM1_BASE
+	hex
+	default 0x1000
+	help
+	  ACPI Power Managment 1 (PM1) i/o-mapped base address.
+	  This device is defined in ACPI specification, with 16 bytes in size.
+
+config ACPI_PBLK_BASE
+	hex
+	default 0x1010
+	help
+	  ACPI Processor Block (PBLK) i/o-mapped base address.
+	  This device is defined in ACPI specification, with 16 bytes in size.
+
+config SPI_DMA_BASE
+	hex
+	default 0x1020
+	help
+	  SPI DMA i/o-mapped base address.
+
+config GPIO_BASE
+	hex
+	default 0x1080
+	help
+	  GPIO i/o-mapped base address.
+
+config ACPI_GPE0_BASE
+	hex
+	default 0x1100
+	help
+	  ACPI General Purpose Event 0 (GPE0) i/o-mapped base address.
+	  This device is defined in ACPI specification, with 64 bytes in size.
+
+config WDT_BASE
+	hex
+	default 0x1140
+	help
+	  Watchdog timer i/o-mapped base address.
+
+config SYS_CAR_ADDR
+	hex
+	default ESRAM_BASE
+
+config SYS_CAR_SIZE
+	hex
+	default 0x8000
+	help
+	  Space in bytes in eSRAM used as Cache-As-ARM (CAR).
+	  Note this size must not exceed eSRAM's total size.
+
+endif

arch/x86/cpu/quark/Makefile

@@ -0,0 +1,8 @@
+#
+# Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y += car.o dram.o msg_port.o quark.o
+obj-$(CONFIG_PCI) += pci.o

arch/x86/cpu/quark/dram.c

@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/post.h>
+#include <asm/arch/quark.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+	/* hardcode the DRAM size for now */
+	gd->ram_size = DRAM_MAX_SIZE;
+	post_code(POST_DRAM);
+
+	return 0;
+}
+
+void dram_init_banksize(void)
+{
+	gd->bd->bi_dram[0].start = 0;
+	gd->bd->bi_dram[0].size = gd->ram_size;
+}
+
+/*
+ * This function looks for the highest region of memory lower than 4GB which
+ * has enough space for U-Boot where U-Boot is aligned on a page boundary.
+ * It overrides the default implementation found elsewhere which simply
+ * picks the end of ram, wherever that may be. The location of the stack,
+ * the relocation address, and how far U-Boot is moved by relocation are
+ * set in the global data structure.
+ */
+ulong board_get_usable_ram_top(ulong total_size)
+{
+	return gd->ram_size;
+}

arch/x86/cpu/quark/pci.c

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <pci.h>
+#include <asm/pci.h>
+#include <asm/arch/device.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void board_pci_setup_hose(struct pci_controller *hose)
+{
+	hose->first_busno = 0;
+	hose->last_busno = 0;
+
+	/* PCI memory space */
+	pci_set_region(hose->regions + 0,
+		       CONFIG_PCI_MEM_BUS,
+		       CONFIG_PCI_MEM_PHYS,
+		       CONFIG_PCI_MEM_SIZE,
+		       PCI_REGION_MEM);
+
+	/* PCI IO space */
+	pci_set_region(hose->regions + 1,
+		       CONFIG_PCI_IO_BUS,
+		       CONFIG_PCI_IO_PHYS,
+		       CONFIG_PCI_IO_SIZE,
+		       PCI_REGION_IO);
+
+	pci_set_region(hose->regions + 2,
+		       CONFIG_PCI_PREF_BUS,
+		       CONFIG_PCI_PREF_PHYS,
+		       CONFIG_PCI_PREF_SIZE,
+		       PCI_REGION_PREFETCH);
+
+	pci_set_region(hose->regions + 3,
+		       0,
+		       0,
+		       gd->ram_size,
+		       PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+
+	hose->region_count = 4;
+}
+
+int board_pci_post_scan(struct pci_controller *hose)
+{
+	return 0;
+}
+
+int pci_skip_dev(struct pci_controller *hose, pci_dev_t dev)
+{
+	/*
+	 * TODO:
+	 *
+	 * For some unknown reason, the PCI enumeration process hangs
+	 * when it scans to the PCIe root port 0 (D23:F0) & 1 (D23:F1).
+	 *
+	 * For now we just skip these two devices, and this needs to
+	 * be revisited later.
+	 */
+	if (dev == QUARK_HOST_BRIDGE ||
+	    dev == QUARK_PCIE0 || dev == QUARK_PCIE1) {
+		return 1;
+	}
+
+	return 0;
+}

arch/x86/cpu/quark/quark.c

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/pci.h>
+#include <asm/post.h>
+#include <asm/processor.h>
+
+int arch_cpu_init(void)
+{
+	struct pci_controller *hose;
+	int ret;
+
+	post_code(POST_CPU_INIT);
+#ifdef CONFIG_SYS_X86_TSC_TIMER
+	timer_set_base(rdtsc());
+#endif
+
+	ret = x86_cpu_init_f();
+	if (ret)
+		return ret;
+
+	ret = pci_early_init_hose(&hose);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+int print_cpuinfo(void)
+{
+	post_code(POST_CPU_INFO);
+	return default_print_cpuinfo();
+}
+
+void reset_cpu(ulong addr)
+{
+	/* cold reset */
+	outb(0x08, PORT_RESET);
+}

arch/x86/include/asm/arch-quark/gpio.h

@@ -0,0 +1,13 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _X86_ARCH_GPIO_H_
+#define _X86_ARCH_GPIO_H_
+
+/* Where in config space is the register that points to the GPIO registers? */
+#define PCI_CFG_GPIOBASE 0x44
+
+#endif /* _X86_ARCH_GPIO_H_ */