arm: mediatek: add support for MediaTek MT7987 SoC
This patch adds basic support for MediaTek MT7987 SoC.
This includes files that will initialize the SoC after boot and
its device tree.
In order to maximize the continuous usable memory space, MT7987 has its
ATF BL31 loaded at the top of RAM. Since u-boot will also locate itself to
top of RAM, u-boot will read the actual memory region of BL31 and set
correct gd->ram_top to avoid u-boot overlapping with BL31.
As now support for mt7987 hasn't been submitted to linux kernel, all dts
filed will be put to arch/arm/dts. They'll be removed after successfully
being merged by linux kernel, and OF_UPSTREAM will also be switched on.
diff --git a/arch/arm/mach-mediatek/tzcfg.c b/arch/arm/mach-mediatek/tzcfg.c
new file mode 100644
index 0000000..71982ba
--- /dev/null
+++ b/arch/arm/mach-mediatek/tzcfg.c
@@ -0,0 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2024 MediaTek Inc.
+ *
+ * Author: Weijie Gao <weijie.gao@mediatek.com>
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <asm/global_data.h>
+#include <linux/kernel.h>
+#include <linux/arm-smccc.h>
+#include <linux/sizes.h>
+#include <command.h>
+#include <fdtdec.h>
+#include <fdt_support.h>
+#include <lmb.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define MTK_SIP_GET_BL31_REGION 0x82000300
+#define MTK_SIP_GET_BL32_REGION 0x82000301
+
+#define BL31_DEFAULT_ADDR 0x43000000
+#define BL31_DEFAULT_SIZE 0x80000
+
+#define TZ_REGION_MAX_SIZE SZ_16M
+#define U_BOOT_MIN_SIZE SZ_4M
+#define U_BOOT_MIN_STACK_SIZE SZ_1M
+#define REGION_ALIGNMENT SZ_64K
+
+struct tz_reserved_region {
+ phys_addr_t addr;
+ phys_addr_t size;
+};
+
+static bool fix_tz_region(struct tz_reserved_region region[],
+ uint32_t used_regions)
+{
+ phys_addr_t size;
+
+ if (region[0].addr + region[0].size > gd->ram_top) {
+ if (region[0].addr >= gd->ram_top) {
+ debug("Discarded region 0x%08llx, size 0x%llx\n",
+ region[0].addr, region[0].size);
+
+ if (used_regions > 1)
+ region[0] = region[1];
+
+ return true;
+ }
+
+ size = gd->ram_top - region[0].addr;
+
+ debug("Truncated region 0x%08llx, size 0x%llx -> 0x%llx\n",
+ region[0].addr, region[0].size, size);
+
+ region[0].size = size;
+ }
+
+ return false;
+}
+
+phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
+{
+ phys_addr_t uboot_ram_top, pstore_size, uboot_size = 0;
+ struct tz_reserved_region region[2], tmp;
+ phys_addr_t top_addr, low_addr;
+ struct arm_smccc_res res;
+ u32 used_regions = 1;
+
+ /* BL31 region */
+ arm_smccc_smc(MTK_SIP_GET_BL31_REGION, 0, 0, 0, 0, 0, 0, 0, &res);
+ if (res.a0) {
+ /* Assume PIE is not enabled for BL31 */
+ region[0].addr = BL31_DEFAULT_ADDR;
+ region[0].size = BL31_DEFAULT_SIZE;
+ } else {
+ region[0].addr = res.a1;
+ region[0].size = res.a2;
+ }
+
+ debug("BL31 @ 0x%08llx, size 0x%llx\n", region[0].addr,
+ region[0].size);
+
+ /* BL32 region is optional */
+ arm_smccc_smc(MTK_SIP_GET_BL32_REGION, 0, 0, 0, 0, 0, 0, 0, &res);
+ if (!res.a0 && res.a1 && res.a2) {
+ region[used_regions].addr = res.a1;
+ region[used_regions].size = res.a2;
+
+ debug("BL32 @ 0x%08llx, size 0x%llx\n",
+ region[used_regions].addr, region[used_regions].size);
+
+ used_regions++;
+ }
+
+ if (used_regions == 2) {
+ if (region[0].addr < region[1].addr) {
+ /* Make sure region[0] is higher than region[1] */
+ tmp = region[0];
+ region[0] = region[1];
+ region[1] = tmp;
+ }
+
+ top_addr = region[0].addr + region[0].size;
+ low_addr = min_t(phys_addr_t, region[0].addr, region[1].addr);
+
+ if (top_addr - low_addr <= TZ_REGION_MAX_SIZE) {
+ /* Merge region if they're overlapped or close enough */
+ region[0].size = top_addr - low_addr;
+ region[0].addr = low_addr;
+
+ debug("Merged region @ 0x%08llx, size 0x%llx\n",
+ region[0].addr, region[0].size);
+
+ used_regions = 1;
+ }
+ }
+
+ debug("Effective memory @ 0x%08zx, size 0x%llx\n", gd->ram_base,
+ gd->ram_top - gd->ram_base);
+
+ /* Discard/fix region which is outside the effective memory */
+ if (fix_tz_region(region, used_regions)) {
+ used_regions--;
+
+ if (used_regions) {
+ if (fix_tz_region(region, used_regions))
+ used_regions--;
+ }
+ }
+
+ /* Size needed for u-boot & pstore */
+#if IS_ENABLED(CONFIG_CMD_PSTORE)
+ /* pstore will be placed under ram top */
+ pstore_size = (CONFIG_CMD_PSTORE_MEM_SIZE + REGION_ALIGNMENT - 1) &
+ ~(REGION_ALIGNMENT - 1);
+ /* u-boot will be placed under pstore */
+ uboot_size += pstore_size;
+#endif
+
+ uboot_size += max_t(uintptr_t, U_BOOT_MIN_SIZE, total_size);
+ uboot_size += U_BOOT_MIN_STACK_SIZE + REGION_ALIGNMENT - 1;
+ uboot_size &= ~(REGION_ALIGNMENT - 1);
+
+ uboot_ram_top = gd->ram_top & ~(REGION_ALIGNMENT - 1);
+
+ if (!used_regions ||
+ (uboot_ram_top - region[0].addr - region[0].size >= uboot_size)) {
+ /* No reserved region present,
+ * or gap between high region and ram top is large enough
+ */
+ uboot_ram_top -= pstore_size;
+ return uboot_ram_top;
+ }
+
+ uboot_ram_top = region[0].addr & ~(REGION_ALIGNMENT - 1);
+
+ if (used_regions == 2 &&
+ (uboot_ram_top - region[1].addr - region[1].size >= uboot_size)) {
+ /* Gap between high region and low region is large enough */
+ uboot_ram_top -= pstore_size;
+ return uboot_ram_top;
+ }
+
+ uboot_ram_top = region[used_regions - 1].addr & ~(REGION_ALIGNMENT - 1);
+
+ /* Under low region */
+ uboot_ram_top -= pstore_size;
+ return uboot_ram_top;
+}
+
+int arch_misc_init(void)
+{
+ struct arm_smccc_res res;
+
+ /*
+ * Since board_get_usable_ram_top is be called before arch_misc_init,
+ * there's no need to check the result
+ */
+ arm_smccc_smc(MTK_SIP_GET_BL31_REGION, 0, 0, 0, 0, 0, 0, 0, &res);
+ lmb_reserve(res.a1, res.a2, LMB_NOMAP);
+
+ arm_smccc_smc(MTK_SIP_GET_BL32_REGION, 0, 0, 0, 0, 0, 0, 0, &res);
+ if (!res.a0 && res.a1 && res.a2)
+ lmb_reserve(res.a1, res.a2, LMB_NOMAP);
+
+#if IS_ENABLED(CONFIG_CMD_PSTORE)
+ char cmd[64];
+
+ /* Override default pstore address */
+ snprintf(cmd, sizeof(cmd), "pstore set 0x%llx 0x%x", gd->ram_top,
+ CONFIG_CMD_PSTORE_MEM_SIZE);
+ run_command(cmd, 0);
+#endif
+
+ return 0;
+}
+
+/* For board-level setup */
+__weak int mtk_ft_system_setup(void *blob, struct bd_info *bd)
+{
+ return 0;
+}
+
+int ft_system_setup(void *blob, struct bd_info *bd)
+{
+ struct arm_smccc_res res;
+ struct fdt_memory mem;
+ int ret;
+
+ arm_smccc_smc(MTK_SIP_GET_BL31_REGION, 0, 0, 0, 0, 0, 0, 0, &res);
+
+ mem.start = res.a1;
+ mem.end = res.a1 + res.a2 - 1;
+
+ ret = fdtdec_add_reserved_memory(blob, "secmon", &mem, NULL, 0, NULL,
+ FDTDEC_RESERVED_MEMORY_NO_MAP);
+ if (ret < 0) {
+ log_err("Failed to add reserved-memory for BL31: %s\n",
+ fdt_strerror(ret));
+ return ret;
+ }
+
+ arm_smccc_smc(MTK_SIP_GET_BL32_REGION, 0, 0, 0, 0, 0, 0, 0, &res);
+ if (!res.a0 && res.a1 && res.a2) {
+ mem.start = res.a1;
+ mem.end = res.a1 + res.a2 - 1;
+
+ ret = fdtdec_add_reserved_memory(blob, "trustzone", &mem, NULL,
+ 0, NULL,
+ FDTDEC_RESERVED_MEMORY_NO_MAP);
+ if (ret < 0) {
+ log_err("Failed to add reserved-memory for BL32: %s\n",
+ fdt_strerror(ret));
+ return ret;
+ }
+ }
+
+ return mtk_ft_system_setup(blob, bd);
+}