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authorRayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>2020-07-15 22:49:04 +0530
committerTom Rini <trini@konsulko.com>2020-07-29 10:37:11 -0400
commitc8b98482d8b320be73f9eb8b8794f09dcb5044bd (patch)
treefeccb9a8b8d128992a249135dfc16495949da60a /board
parent3edecba78413c46ccafedfb111f28eafbaf527d1 (diff)
board: ns3: define ddr memory layout
Add both DRAM banks memory information and the corresponding MMU page table mappings. Signed-off-by: Bharat Kumar Reddy Gooty <bharat.gooty@broadcom.com> Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'board')
-rw-r--r--board/broadcom/bcmns3/ns3.c106
1 files changed, 102 insertions, 4 deletions
diff --git a/board/broadcom/bcmns3/ns3.c b/board/broadcom/bcmns3/ns3.c
index a9c3a0990f..dcdde408db 100644
--- a/board/broadcom/bcmns3/ns3.c
+++ b/board/broadcom/bcmns3/ns3.c
@@ -5,15 +5,41 @@
*/
#include <common.h>
+#include <fdt_support.h>
#include <asm/io.h>
#include <asm/gic-v3.h>
#include <asm/system.h>
#include <asm/armv8/mmu.h>
#include <asm/arch-bcmns3/bl33_info.h>
+#include <dt-bindings/memory/bcm-ns3-mc.h>
/* Default reset-level = 3 and strap-val = 0 */
#define L3_RESET 30
+#define BANK_OFFSET(bank) ((u64)BCM_NS3_DDR_INFO_BASE + 8 + ((bank) * 16))
+
+/*
+ * ns3_dram_bank - DDR bank details
+ *
+ * @start: DDR bank start address
+ * @len: DDR bank length
+ */
+struct ns3_dram_bank {
+ u64 start[BCM_NS3_MAX_NR_BANKS];
+ u64 len[BCM_NS3_MAX_NR_BANKS];
+};
+
+/*
+ * ns3_dram_hdr - DDR header info
+ *
+ * @sig: DDR info signature
+ * @bank: DDR bank details
+ */
+struct ns3_dram_hdr {
+ u32 sig;
+ struct ns3_dram_bank bank;
+};
+
static struct mm_region ns3_mem_map[] = {
{
.virt = 0x0UL,
@@ -23,9 +49,15 @@ static struct mm_region ns3_mem_map[] = {
PTE_BLOCK_NON_SHARE |
PTE_BLOCK_PXN | PTE_BLOCK_UXN
}, {
- .virt = 0x80000000UL,
- .phys = 0x80000000UL,
- .size = 0x80000000UL,
+ .virt = BCM_NS3_MEM_START,
+ .phys = BCM_NS3_MEM_START,
+ .size = BCM_NS3_MEM_LEN,
+ .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
+ PTE_BLOCK_INNER_SHARE
+ }, {
+ .virt = BCM_NS3_BANK_1_MEM_START,
+ .phys = BCM_NS3_BANK_1_MEM_START,
+ .size = BCM_NS3_BANK_1_MEM_LEN,
.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
PTE_BLOCK_INNER_SHARE
}, {
@@ -44,6 +76,72 @@ DECLARE_GLOBAL_DATA_PTR;
*/
struct bl33_info *bl33_info __section(".data");
+/*
+ * Run modulo 256 checksum calculation and return the calculated checksum
+ */
+static u8 checksum_calc(u8 *p, unsigned int len)
+{
+ unsigned int i;
+ u8 chksum = 0;
+
+ for (i = 0; i < len; i++)
+ chksum += p[i];
+
+ return chksum;
+}
+
+/*
+ * This function parses the memory layout information from a reserved area in
+ * DDR, and then fix up the FDT before passing it to Linux.
+ *
+ * In the case of error, do nothing and the default memory layout in DT will
+ * be used
+ */
+static int mem_info_parse_fixup(void *fdt)
+{
+ struct ns3_dram_hdr hdr;
+ u32 *p32, i, nr_banks;
+ u64 *p64;
+
+ /* validate signature */
+ p32 = (u32 *)BCM_NS3_DDR_INFO_BASE;
+ hdr.sig = *p32;
+ if (hdr.sig != BCM_NS3_DDR_INFO_SIG) {
+ printf("DDR info signature 0x%x invalid\n", hdr.sig);
+ return -EINVAL;
+ }
+
+ /* run checksum test to validate data */
+ if (checksum_calc((u8 *)p32, BCM_NS3_DDR_INFO_LEN) != 0) {
+ printf("Checksum on DDR info failed\n");
+ return -EINVAL;
+ }
+
+ /* parse information for each bank */
+ nr_banks = 0;
+ for (i = 0; i < BCM_NS3_MAX_NR_BANKS; i++) {
+ /* skip banks with a length of zero */
+ p64 = (u64 *)BANK_OFFSET(i);
+ if (*(p64 + 1) == 0)
+ continue;
+
+ hdr.bank.start[i] = *p64;
+ hdr.bank.len[i] = *(p64 + 1);
+
+ printf("mem[%u] 0x%llx - 0x%llx\n", i, hdr.bank.start[i],
+ hdr.bank.start[i] + hdr.bank.len[i] - 1);
+ nr_banks++;
+ }
+
+ if (!nr_banks) {
+ printf("No DDR banks detected\n");
+ return -ENOMEM;
+ }
+
+ return fdt_fixup_memory_banks(fdt, hdr.bank.start, hdr.bank.len,
+ nr_banks);
+}
+
int board_init(void)
{
if (bl33_info->version != BL33_INFO_VERSION)
@@ -98,6 +196,6 @@ int ft_board_setup(void *fdt, struct bd_info *bd)
{
gic_lpi_tables_init();
- return 0;
+ return mem_info_parse_fixup(fdt);
}
#endif /* CONFIG_OF_BOARD_SETUP */