[S] Change in coreboot[main]: [LNL]: [TEST]Enable MRC Cache R/W for x64

[Saurabh Mishra (Code Review)]

Saurabh Mishra has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/81927?usp=email )

Change subject: [LNL]: [TEST]Enable MRC Cache R/W for x64
......................................................................

[LNL]: [TEST]Enable MRC Cache R/W for x64

Change-Id: I68ad6d3a95d51ef205640785804b73fcdc27a830
Signed-off-by: Saurabh Mishra 
---
M src/soc/intel/common/block/fast_spi/fast_spi_flash.c
1 file changed, 24 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/27/81927/1

diff --git a/src/soc/intel/common/block/fast_spi/fast_spi_flash.c b/src/soc/intel/common/block/fast_spi/fast_spi_flash.c
index e9cfc23..f4ad2fe 100644
--- a/src/soc/intel/common/block/fast_spi/fast_spi_flash.c
+++ b/src/soc/intel/common/block/fast_spi/fast_spi_flash.c
@@ -73,12 +73,34 @@
    return fast_spi_flash_ctrlr_reg_read(ctx, SPIBAR_PTDATA);
 }

+static void memcpy2(void* addr, const void* data, size_t len) {
+	size_t i;
+	uint32_t *dst32 = (uint32_t*) addr;
+	const uint32_t *src32 = (const uint32_t*) data;
+	uint8_t *dst8 = NULL;
+	const uint8_t *src8 = NULL;
+	size_t a = len % 4;
+	size_t b = len / 4;
+
+    // Copy in 32-bit chunks
+    for (i = 0; i < b; i++)
+		*dst32++ = *src32++;
+
+    dst8 = (uint8_t*) (dst32);
+    src8 = (const uint8_t*) (src32);
+
+    // Copy any remaining bytes one by one
+    for (i = 0; i < a; i++) {
+        *dst8++ = *src8++;
+    }
+}
+
 /* Fill FDATAn FIFO in preparation for a write transaction. */
 static void fill_xfer_fifo(struct fast_spi_flash_ctx *ctx, const void *data,
    		   size_t len)
 {
    /* YES! memcpy() works. FDATAn does not require 32-bit accesses. */
-	memcpy((void *)(ctx->mmio_base + SPIBAR_FDATA(0)), data, len);
+	memcpy2((void *)(ctx->mmio_base + SPIBAR_FDATA(0)), data, len);
 }

/* Drain FDATAn FIFO after a read transaction populates data. */
@@ -86,7 +108,7 @@
    			size_t len)
 {
    /* YES! memcpy() works. FDATAn does not require 32-bit accesses. */
-	memcpy(dest, (void *)(ctx->mmio_base + SPIBAR_FDATA(0)), len);
+	memcpy2(dest, (void *)(ctx->mmio_base + SPIBAR_FDATA(0)), len);
 }

/* Fire up a transfer using the hardware sequencer. */