[PATCH v1 2/3] sync sdram ecc support to mainstream

[Brian Sune]

It is been a while that the DDR ECC is missing.
Pull from Altera trunk and sync to mainstream.
This sdram_soc32 introduce the ecc setup.
Modifications are done to support dts memory at 0
while old memory will work properly on gd->bd
Real ECC supported board test is required.

Signed-off-by: Brian Sune <briansune at gmail.com>
---
 drivers/ddr/altera/sdram_soc32.c | 71 ++++++++++++++++++++++++++++++++
 drivers/ddr/altera/sdram_soc32.h | 11 +++++
 2 files changed, 82 insertions(+)
 create mode 100644 drivers/ddr/altera/sdram_soc32.c
 create mode 100644 drivers/ddr/altera/sdram_soc32.h

diff --git a/drivers/ddr/altera/sdram_soc32.c b/drivers/ddr/altera/sdram_soc32.c
new file mode 100644
index 00000000000..e82146e448e
--- /dev/null
+++ b/drivers/ddr/altera/sdram_soc32.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Intel Corporation <www.intel.com>
+ */
+
+#include <cpu_func.h>
+#include <dm.h>
+#include <asm/system.h>
+#include <linux/sizes.h>
+#include "sdram_soc32.h"
+#include <watchdog.h>
+#include <wait_bit.h>
+#if !defined(CONFIG_HW_WATCHDOG)
+#include <asm/arch/reset_manager.h>
+#endif
+
+#define PGTABLE_OFF	0x4000
+
+/* Initialize SDRAM ECC bits to avoid false DBE */
+void sdram_init_ecc_bits(unsigned long long sdram_size)
+{
+	u32 start;
+	phys_addr_t start_addr;
+	phys_size_t size, size_init;
+
+	start = get_timer(0);
+
+	start_addr = 0;
+	size = sdram_size;
+
+	printf("DDRCAL: Scrubbing ECC RAM (%ld MiB).\n", size >> 20);
+
+	memset((void *)start_addr, 0, PGTABLE_SIZE + PGTABLE_OFF);
+	start_addr += PGTABLE_SIZE + PGTABLE_OFF;
+	size -= PGTABLE_OFF + PGTABLE_SIZE;
+
+	dcache_enable();
+
+	while (size > 0) {
+		size_init = min((phys_addr_t)SZ_1G, (phys_addr_t)size);
+		memset((void *)start_addr, 0, size_init);
+		size -= size_init;
+		start_addr += size_init;
+
+		debug("%s: %d\n", __func__, __LINE__);
+
+#ifdef CONFIG_HW_WATCHDOG
+		/*
+		 * In case the watchdog is enabled,
+		 * make sure to (re-)configure watchdog
+		 * so that the defined timeout is valid.
+		 */
+		hw_watchdog_init();
+#else
+		/*
+		 * If the HW watchdog is NOT enabled,
+		 * make sure it is not running, because
+		 * it is enabled in the preloader and
+		 * causing boot loop if is not handled.
+		 */
+		socfpga_per_reset(SOCFPGA_RESET(L4WD0), 1);
+		socfpga_per_reset(SOCFPGA_RESET(L4WD0), 0);
+#endif
+	}
+
+	dcache_disable();
+
+	printf("DDRCAL: SDRAM-ECC initialized success with %d ms\n",
+	       (u32)get_timer(start));
+}
+
diff --git a/drivers/ddr/altera/sdram_soc32.h b/drivers/ddr/altera/sdram_soc32.h
new file mode 100644
index 00000000000..7bd76eb560f
--- /dev/null
+++ b/drivers/ddr/altera/sdram_soc32.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 Intel Corporation <www.intel.com>
+ */
+
+#ifndef	_SDRAM_SOC32_H_
+#define	_SDRAM_SOC32_H_
+
+void sdram_init_ecc_bits(unsigned long long sdram_size);
+
+#endif /* _SDRAM_SOC32_H_ */
-- 
2.34.1