[PATCH 15/42] imx9: cut off OPTEE memory region from U-Boot

[Peng Fan (OSS)]

From: Peng Fan <peng.fan at nxp.com>

OPTEE memory region is set secure access only in ATF with configuration
to TRDC, and need to remove it from U-Boot, otherwise U-Boot and Kernel
may crash when accessing the memory

Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 arch/arm/mach-imx/imx9/soc.c | 149 ++++++++++++++++++++++++++++++++++-
 1 file changed, 148 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-imx/imx9/soc.c b/arch/arm/mach-imx/imx9/soc.c
index a16e22ea6bb..a27262492e7 100644
--- a/arch/arm/mach-imx/imx9/soc.c
+++ b/arch/arm/mach-imx/imx9/soc.c
@@ -180,13 +180,160 @@ static struct mm_region imx93_mem_map[] = {
 
 struct mm_region *mem_map = imx93_mem_map;
 
+static unsigned int imx9_find_dram_entry_in_mem_map(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(imx93_mem_map); i++)
+		if (imx93_mem_map[i].phys == CFG_SYS_SDRAM_BASE)
+			return i;
+
+	hang();	/* Entry not found, this must never happen. */
+}
+
+void enable_caches(void)
+{
+	/* If OPTEE runs, remove OPTEE memory from MMU table to avoid speculative prefetch
+	 * If OPTEE does not run, still update the MMU table according to dram banks structure
+	 * to set correct dram size from board_phys_sdram_size
+	 */
+	int i = 0;
+	/*
+	 * please make sure that entry initial value matches
+	 * imx93_mem_map for DRAM1
+	 */
+	int entry = imx9_find_dram_entry_in_mem_map();
+	u64 attrs = imx93_mem_map[entry].attrs;
+
+	while (i < CONFIG_NR_DRAM_BANKS &&
+	       entry < ARRAY_SIZE(imx93_mem_map)) {
+		if (gd->bd->bi_dram[i].start == 0)
+			break;
+		imx93_mem_map[entry].phys = gd->bd->bi_dram[i].start;
+		imx93_mem_map[entry].virt = gd->bd->bi_dram[i].start;
+		imx93_mem_map[entry].size = gd->bd->bi_dram[i].size;
+		imx93_mem_map[entry].attrs = attrs;
+		debug("Added memory mapping (%d): %llx %llx\n", entry,
+		      imx93_mem_map[entry].phys, imx93_mem_map[entry].size);
+		i++; entry++;
+	}
+
+	icache_enable();
+	dcache_enable();
+}
+
+__weak int board_phys_sdram_size(phys_size_t *size)
+{
+	if (!size)
+		return -EINVAL;
+
+	*size = PHYS_SDRAM_SIZE;
+
+#ifdef PHYS_SDRAM_2_SIZE
+	*size += PHYS_SDRAM_2_SIZE;
+#endif
+	return 0;
+}
+
 int dram_init(void)
 {
-	gd->ram_size = PHYS_SDRAM_SIZE;
+	phys_size_t sdram_size;
+	int ret;
+
+	ret = board_phys_sdram_size(&sdram_size);
+	if (ret)
+		return ret;
+
+	/* rom_pointer[1] contains the size of TEE occupies */
+	if (rom_pointer[1])
+		gd->ram_size = sdram_size - rom_pointer[1];
+	else
+		gd->ram_size = sdram_size;
+
+	return 0;
+}
+
+int dram_init_banksize(void)
+{
+	int bank = 0;
+	int ret;
+	phys_size_t sdram_size;
+	phys_size_t sdram_b1_size, sdram_b2_size;
+
+	ret = board_phys_sdram_size(&sdram_size);
+	if (ret)
+		return ret;
+
+	/* Bank 1 can't cross over 4GB space */
+	if (sdram_size > 0x80000000) {
+		sdram_b1_size = 0x80000000;
+		sdram_b2_size = sdram_size - 0x80000000;
+	} else {
+		sdram_b1_size = sdram_size;
+		sdram_b2_size = 0;
+	}
+
+	gd->bd->bi_dram[bank].start = PHYS_SDRAM;
+	if (rom_pointer[1]) {
+		phys_addr_t optee_start = (phys_addr_t)rom_pointer[0];
+		phys_size_t optee_size = (size_t)rom_pointer[1];
+
+		gd->bd->bi_dram[bank].size = optee_start - gd->bd->bi_dram[bank].start;
+		if ((optee_start + optee_size) < (PHYS_SDRAM + sdram_b1_size)) {
+			if (++bank >= CONFIG_NR_DRAM_BANKS) {
+				puts("CONFIG_NR_DRAM_BANKS is not enough\n");
+				return -1;
+			}
+
+			gd->bd->bi_dram[bank].start = optee_start + optee_size;
+			gd->bd->bi_dram[bank].size = PHYS_SDRAM +
+				sdram_b1_size - gd->bd->bi_dram[bank].start;
+		}
+	} else {
+		gd->bd->bi_dram[bank].size = sdram_b1_size;
+	}
+
+	if (sdram_b2_size) {
+		if (++bank >= CONFIG_NR_DRAM_BANKS) {
+			puts("CONFIG_NR_DRAM_BANKS is not enough for SDRAM_2\n");
+			return -1;
+		}
+		gd->bd->bi_dram[bank].start = 0x100000000UL;
+		gd->bd->bi_dram[bank].size = sdram_b2_size;
+	}
 
 	return 0;
 }
 
+phys_size_t get_effective_memsize(void)
+{
+	int ret;
+	phys_size_t sdram_size;
+	phys_size_t sdram_b1_size;
+
+	ret = board_phys_sdram_size(&sdram_size);
+	if (!ret) {
+		/* Bank 1 can't cross over 4GB space */
+		if (sdram_size > 0x80000000)
+			sdram_b1_size = 0x80000000;
+		else
+			sdram_b1_size = sdram_size;
+
+		if (rom_pointer[1]) {
+			/* We will relocate u-boot to top of dram1. TEE position has two cases:
+			 * 1. At the top of dram1,  Then return the size removed optee size.
+			 * 2. In the middle of dram1, return the size of dram1.
+			 */
+			if ((rom_pointer[0] + rom_pointer[1]) == (PHYS_SDRAM + sdram_b1_size))
+				return ((phys_addr_t)rom_pointer[0] - PHYS_SDRAM);
+		}
+
+		return sdram_b1_size;
+	} else {
+		return PHYS_SDRAM_SIZE;
+	}
+}
+
 void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
 {
 	mac[0] = 0x1;
-- 
2.40.0