x86: apl: Add SPL loaders

Add loaders for SPL and TPL so that the next stage can be loaded from
memory-mapped SPI or, failing that, the Fast SPI driver.

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

2 files changed, 180 insertions, 0 deletions

diff --git a/arch/x86/cpu/apollolake/Makefile b/arch/x86/cpu/apollolake/Makefile
index 875d454157..1fde400d77 100644
--- a/arch/x86/cpu/apollolake/Makefile
+++ b/arch/x86/cpu/apollolake/Makefile
@@ -2,7 +2,9 @@
 #
 # Copyright 2019 Google LLC
 
+obj-$(CONFIG_SPL_BUILD) += spl.o
 obj-$(CONFIG_SPL_BUILD) += systemagent.o
+
 ifndef CONFIG_TPL_BUILD
 obj-y += punit.o
 endif
diff --git a/arch/x86/cpu/apollolake/spl.c b/arch/x86/cpu/apollolake/spl.c
new file mode 100644
index 0000000000..7ab7243311
--- /dev/null
+++ b/arch/x86/cpu/apollolake/spl.c
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 Google LLC
+ */
+
+#include <common.h>
+#include <binman_sym.h>
+#include <dm.h>
+#include <spi.h>
+#include <spl.h>
+#include <spi_flash.h>
+#include <asm/fast_spi.h>
+#include <asm/spl.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/iomap.h>
+#include <dm/device-internal.h>
+#include <dm/uclass-internal.h>
+
+/* This reads the next phase from mapped SPI flash */
+static int rom_load_image(struct spl_image_info *spl_image,
+			  struct spl_boot_device *bootdev)
+{
+	ulong spl_pos = spl_get_image_pos();
+	ulong spl_size = spl_get_image_size();
+	struct udevice *dev;
+	ulong map_base;
+	size_t map_size;
+	uint offset;
+	int ret;
+
+	spl_image->size = CONFIG_SYS_MONITOR_LEN;  /* We don't know SPL size */
+	spl_image->entry_point = spl_phase() == PHASE_TPL ?
+		CONFIG_SPL_TEXT_BASE : CONFIG_SYS_TEXT_BASE;
+	spl_image->load_addr = spl_image->entry_point;
+	spl_image->os = IH_OS_U_BOOT;
+	spl_image->name = "U-Boot";
+	debug("Reading from mapped SPI %lx, size %lx", spl_pos, spl_size);
+
+	if (CONFIG_IS_ENABLED(SPI_FLASH_SUPPORT)) {
+		ret = uclass_find_first_device(UCLASS_SPI_FLASH, &dev);
+		if (ret)
+			return log_msg_ret("spi_flash", ret);
+		if (!dev)
+			return log_msg_ret("spi_flash dev", -ENODEV);
+		ret = dm_spi_get_mmap(dev, &map_base, &map_size, &offset);
+		if (ret)
+			return log_msg_ret("mmap", ret);
+	} else {
+		ret = fast_spi_get_bios_mmap(PCH_DEV_SPI, &map_base, &map_size,
+					     &offset);
+		if (ret)
+			return ret;
+	}
+	spl_pos += map_base & ~0xff000000;
+	debug(", base %lx, pos %lx\n", map_base, spl_pos);
+	bootstage_start(BOOTSTAGE_ID_ACCUM_MMAP_SPI, "mmap_spi");
+	memcpy((void *)spl_image->load_addr, (void *)spl_pos, spl_size);
+	cpu_flush_l1d_to_l2();
+	bootstage_accum(BOOTSTAGE_ID_ACCUM_MMAP_SPI);
+
+	return 0;
+}
+SPL_LOAD_IMAGE_METHOD("Mapped SPI", 2, BOOT_DEVICE_SPI_MMAP, rom_load_image);
+
+#if CONFIG_IS_ENABLED(SPI_FLASH_SUPPORT)
+
+static int apl_flash_std_read(struct udevice *dev, u32 offset, size_t len,
+			      void *buf)
+{
+	struct spi_flash *flash = dev_get_uclass_priv(dev);
+	struct mtd_info *mtd = &flash->mtd;
+	size_t retlen;
+
+	return log_ret(mtd->_read(mtd, offset, len, &retlen, buf));
+}
+
+static int apl_flash_probe(struct udevice *dev)
+{
+	return spi_flash_std_probe(dev);
+}
+
+/*
+ * Manually set the parent of the SPI flash to SPI, since dtoc doesn't. We also
+ * need to allocate the parent_platdata since by the time this function is
+ * called device_bind() has already gone past that step.
+ */
+static int apl_flash_bind(struct udevice *dev)
+{
+	if (CONFIG_IS_ENABLED(OF_PLATDATA)) {
+		struct dm_spi_slave_platdata *plat;
+		struct udevice *spi;
+		int ret;
+
+		ret = uclass_first_device_err(UCLASS_SPI, &spi);
+		if (ret)
+			return ret;
+		dev->parent = spi;
+
+		plat = calloc(sizeof(*plat), 1);
+		if (!plat)
+			return -ENOMEM;
+		dev->parent_platdata = plat;
+	}
+
+	return 0;
+}
+
+static const struct dm_spi_flash_ops apl_flash_ops = {
+	.read		= apl_flash_std_read,
+};
+
+static const struct udevice_id apl_flash_ids[] = {
+	{ .compatible = "jedec,spi-nor" },
+	{ }
+};
+
+U_BOOT_DRIVER(winbond_w25q128fw) = {
+	.name		= "winbond_w25q128fw",
+	.id		= UCLASS_SPI_FLASH,
+	.of_match	= apl_flash_ids,
+	.bind		= apl_flash_bind,
+	.probe		= apl_flash_probe,
+	.priv_auto_alloc_size = sizeof(struct spi_flash),
+	.ops		= &apl_flash_ops,
+};
+
+/* This uses a SPI flash device to read the next phase */
+static int spl_fast_spi_load_image(struct spl_image_info *spl_image,
+				   struct spl_boot_device *bootdev)
+{
+	ulong spl_pos = spl_get_image_pos();
+	ulong spl_size = spl_get_image_size();
+	struct udevice *dev;
+	int ret;
+
+	ret = uclass_first_device_err(UCLASS_SPI_FLASH, &dev);
+	if (ret)
+		return ret;
+
+	spl_image->size = CONFIG_SYS_MONITOR_LEN;  /* We don't know SPL size */
+	spl_image->entry_point = spl_phase() == PHASE_TPL ?
+		CONFIG_SPL_TEXT_BASE : CONFIG_SYS_TEXT_BASE;
+	spl_image->load_addr = spl_image->entry_point;
+	spl_image->os = IH_OS_U_BOOT;
+	spl_image->name = "U-Boot";
+	spl_pos &= ~0xff000000;
+	debug("Reading from flash %lx, size %lx\n", spl_pos, spl_size);
+	ret = spi_flash_read_dm(dev, spl_pos, spl_size,
+				(void *)spl_image->load_addr);
+	cpu_flush_l1d_to_l2();
+	if (ret)
+		return ret;
+
+	return 0;
+}
+SPL_LOAD_IMAGE_METHOD("Fast SPI", 1, BOOT_DEVICE_FAST_SPI,
+		      spl_fast_spi_load_image);
+
+void board_boot_order(u32 *spl_boot_list)
+{
+	bool use_spi_flash = IS_ENABLED(CONFIG_APL_BOOT_FROM_FAST_SPI_FLASH);
+
+	if (use_spi_flash) {
+		spl_boot_list[0] = BOOT_DEVICE_FAST_SPI;
+		spl_boot_list[1] = BOOT_DEVICE_SPI_MMAP;
+	} else {
+		spl_boot_list[0] = BOOT_DEVICE_SPI_MMAP;
+		spl_boot_list[1] = BOOT_DEVICE_FAST_SPI;
+	}
+}
+
+#else
+
+void board_boot_order(u32 *spl_boot_list)
+{
+	spl_boot_list[0] = BOOT_DEVICE_SPI_MMAP;
+}
+#endif