GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 Stefan Roese <sr@denx.de>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <init.h>
+#include <linux/libfdt.h>
+#include <linux/sizes.h>
+#include <pci.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/soc.h>
+#include <asm/armv8/mmu.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Not all memory is mapped in the MMU. So we need to restrict the
+ * memory size so that U-Boot does not try to access it. Also, the
+ * internal registers are located at 0xf000.0000 - 0xffff.ffff.
+ * Currently only 2GiB are mapped for system memory. This is what
+ * we pass to the U-Boot subsystem here.
+ */
+#define USABLE_RAM_SIZE		0x80000000
+
+ulong board_get_usable_ram_top(ulong total_size)
+{
+	if (gd->ram_size > USABLE_RAM_SIZE)
+		return USABLE_RAM_SIZE;
+
+	return gd->ram_size;
+}
+
+/*
+ * On ARMv8, MBus is not configured in U-Boot. To enable compilation
+ * of the already implemented drivers, lets add a dummy version of
+ * this function so that linking does not fail.
+ */
+const struct mbus_dram_target_info *mvebu_mbus_dram_info(void)
+{
+	return NULL;
+}
+
+/* DRAM init code ... */
+
+#define MV_SIP_DRAM_SIZE	0x82000010
+
+static u64 a8k_dram_scan_ap_sz(void)
+{
+	struct pt_regs pregs;
+
+	pregs.regs[0] = MV_SIP_DRAM_SIZE;
+	pregs.regs[1] = SOC_REGS_PHY_BASE;
+	smc_call(&pregs);
+
+	return pregs.regs[0];
+}
+
+static void a8k_dram_init_banksize(void)
+{
+	/*
+	 * The firmware (ATF) leaves a 1G whole above the 3G mark for IO
+	 * devices. Higher RAM is mapped at 4G.
+	 *
+	 * Config 2 DRAM banks:
+	 * Bank 0 - max size 4G - 1G
+	 * Bank 1 - ram size - 4G + 1G
+	 */
+	phys_size_t max_bank0_size = SZ_4G - SZ_1G;
+
+	gd->bd->bi_dram[0].start = CONFIG_SYS_SDRAM_BASE;
+	if (gd->ram_size <= max_bank0_size) {
+		gd->bd->bi_dram[0].size = gd->ram_size;
+		return;
+	}
+
+	gd->bd->bi_dram[0].size = max_bank0_size;
+	if (CONFIG_NR_DRAM_BANKS > 1) {
+		gd->bd->bi_dram[1].start = SZ_4G;
+		gd->bd->bi_dram[1].size = gd->ram_size - max_bank0_size;
+	}
+}
+
+__weak int dram_init_banksize(void)
+{
+	if (CONFIG_IS_ENABLED(ARMADA_8K))
+		a8k_dram_init_banksize();
+	else
+		fdtdec_setup_memory_banksize();
+
+	return 0;
+}
+
+__weak int dram_init(void)
+{
+	if (CONFIG_IS_ENABLED(ARMADA_8K)) {
+		gd->ram_size = a8k_dram_scan_ap_sz();
+		if (gd->ram_size != 0)
+			return 0;
+	}
+
+	if (fdtdec_setup_mem_size_base() != 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+int arch_cpu_init(void)
+{
+	/* Nothing to do (yet) */
+	return 0;
+}
+
+int arch_early_init_r(void)
+{
+	struct udevice *dev;
+	int ret;
+	int i;
+
+	/*
+	 * Loop over all MISC uclass drivers to call the comphy code
+	 * and init all CP110 devices enabled in the DT
+	 */
+	i = 0;
+	while (1) {
+		/* Call the comphy code via the MISC uclass driver */
+		ret = uclass_get_device(UCLASS_MISC, i++, &dev);
+
+		/* We're done, once no further CP110 device is found */
+		if (ret)
+			break;
+	}
+
+	/* Cause the SATA device to do its early init */
+	uclass_first_device(UCLASS_AHCI, &dev);
+
+#ifdef CONFIG_DM_PCI
+	/* Trigger PCIe devices detection */
+	pci_init();
+#endif
+
+	return 0;
+}