[U-Boot] [PATCH 3/3] ARM64: zynqmp: Replace board specific with generic memory bank decoding

[Nathan Rossi]

The dram_init and dram_init_banksize functions were using a board
specific implementation for decoding the memory banks from the fdt. This
board specific implementation uses a static variable 'tmp' which makes
these functions unsafe for execution from within the board_init_f
context.

This change makes the dram_init* functions use a generic implementation
of decoding and populating memory bank and size data.

Signed-off-by: Nathan Rossi <nathan at nathanrossi.com>
Fixes: 8d59d7f63b ("ARM64: zynqmp: Read RAM information from DT")
Cc: Michal Simek <michal.simek at xilinx.com>
---
 board/xilinx/zynqmp/zynqmp.c | 112 ++-----------------------------------------
 1 file changed, 3 insertions(+), 109 deletions(-)

diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c
index cef1f6a13a..8a3d0043b9 100644
--- a/board/xilinx/zynqmp/zynqmp.c
+++ b/board/xilinx/zynqmp/zynqmp.c
@@ -180,121 +180,15 @@ int zynq_board_read_rom_ethaddr(unsigned char *ethaddr)
 }
 
 #if !defined(CONFIG_SYS_SDRAM_BASE) && !defined(CONFIG_SYS_SDRAM_SIZE)
-/*
- * fdt_get_reg - Fill buffer by information from DT
- */
-static phys_size_t fdt_get_reg(const void *fdt, int nodeoffset, void *buf,
-			       const u32 *cell, int n)
-{
-	int i = 0, b, banks;
-	int parent_offset = fdt_parent_offset(fdt, nodeoffset);
-	int address_cells = fdt_address_cells(fdt, parent_offset);
-	int size_cells = fdt_size_cells(fdt, parent_offset);
-	char *p = buf;
-	u64 val;
-	u64 vals;
-
-	debug("%s: addr_cells=%x, size_cell=%x, buf=%p, cell=%p\n",
-	      __func__, address_cells, size_cells, buf, cell);
-
-	/* Check memory bank setup */
-	banks = n % (address_cells + size_cells);
-	if (banks)
-		panic("Incorrect memory setup cells=%d, ac=%d, sc=%d\n",
-		      n, address_cells, size_cells);
-
-	banks = n / (address_cells + size_cells);
-
-	for (b = 0; b < banks; b++) {
-		debug("%s: Bank #%d:\n", __func__, b);
-		if (address_cells == 2) {
-			val = cell[i + 1];
-			val <<= 32;
-			val |= cell[i];
-			val = fdt64_to_cpu(val);
-			debug("%s: addr64=%llx, ptr=%p, cell=%p\n",
-			      __func__, val, p, &cell[i]);
-			*(phys_addr_t *)p = val;
-		} else {
-			debug("%s: addr32=%x, ptr=%p\n",
-			      __func__, fdt32_to_cpu(cell[i]), p);
-			*(phys_addr_t *)p = fdt32_to_cpu(cell[i]);
-		}
-		p += sizeof(phys_addr_t);
-		i += address_cells;
-
-		debug("%s: pa=%p, i=%x, size=%zu\n", __func__, p, i,
-		      sizeof(phys_addr_t));
-
-		if (size_cells == 2) {
-			vals = cell[i + 1];
-			vals <<= 32;
-			vals |= cell[i];
-			vals = fdt64_to_cpu(vals);
-
-			debug("%s: size64=%llx, ptr=%p, cell=%p\n",
-			      __func__, vals, p, &cell[i]);
-			*(phys_size_t *)p = vals;
-		} else {
-			debug("%s: size32=%x, ptr=%p\n",
-			      __func__, fdt32_to_cpu(cell[i]), p);
-			*(phys_size_t *)p = fdt32_to_cpu(cell[i]);
-		}
-		p += sizeof(phys_size_t);
-		i += size_cells;
-
-		debug("%s: ps=%p, i=%x, size=%zu\n",
-		      __func__, p, i, sizeof(phys_size_t));
-	}
-
-	/* Return the first address size */
-	return *(phys_size_t *)((char *)buf + sizeof(phys_addr_t));
-}
-
-#define FDT_REG_SIZE  sizeof(u32)
-/* Temp location for sharing data for storing */
-/* Up to 64-bit address + 64-bit size */
-static u8 tmp[CONFIG_NR_DRAM_BANKS * 16];
-
 void dram_init_banksize(void)
 {
-	int bank;
-
-	memcpy(&gd->bd->bi_dram[0], &tmp, sizeof(tmp));
-
-	for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
-		debug("Bank #%d: start %llx\n", bank,
-		      (unsigned long long)gd->bd->bi_dram[bank].start);
-		debug("Bank #%d: size %llx\n", bank,
-		      (unsigned long long)gd->bd->bi_dram[bank].size);
-	}
+	fdtdec_setup_memory_banksize();
 }
 
 int dram_init(void)
 {
-	int node, len;
-	const void *blob = gd->fdt_blob;
-	const u32 *cell;
-
-	memset(&tmp, 0, sizeof(tmp));
-
-	/* find or create "/memory" node. */
-	node = fdt_subnode_offset(blob, 0, "memory");
-	if (node < 0) {
-		printf("%s: Can't get memory node\n", __func__);
-		return node;
-	}
-
-	/* Get pointer to cells and lenght of it */
-	cell = fdt_getprop(blob, node, "reg", &len);
-	if (!cell) {
-		printf("%s: Can't get reg property\n", __func__);
-		return -1;
-	}
-
-	gd->ram_size = fdt_get_reg(blob, node, &tmp, cell, len / FDT_REG_SIZE);
-
-	debug("%s: Initial DRAM size %llx\n", __func__, (u64)gd->ram_size);
+	if (fdtdec_setup_memory_size() != 0)
+		return -EINVAL;
 
 	return 0;
 }
-- 
2.10.2