This adds a driver to handle enabling the clock for the AI SRAM. This was
previously done in board_init, but it needs to happen before relocation
now. An alternative would be to move this to board_init_early_f, but by
doing it this way we can use clk_bulk.
Signed-off-by: Sean Anderson
Reviewed-by: Simon Glass
---
(no changes since v1)
MAINTAINERS| 1 +
drivers/ram/Kconfig| 7 ++
drivers/ram/Makefile | 1 +
drivers/ram/kendryte.c | 56 ++
4 files changed, 65 insertions(+)
create mode 100644 drivers/ram/kendryte.c
diff --git a/MAINTAINERS b/MAINTAINERS
index fb9ba37984..166acb30c2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -938,6 +938,7 @@ F: doc/device-tree-bindings/mfd/kendryte,k210-sysctl.txt
F: doc/device-tree-bindings/pinctrl/kendryte,k210-fpioa.txt
F: drivers/clk/kendryte/
F: drivers/pinctrl/kendryte/
+F: drivers/ram/kendryte.c
F: include/kendryte/
RNG
diff --git a/drivers/ram/Kconfig b/drivers/ram/Kconfig
index a270e13b26..075e6b5cd7 100644
--- a/drivers/ram/Kconfig
+++ b/drivers/ram/Kconfig
@@ -73,6 +73,13 @@ config IMXRT_SDRAM
to support external memories like sdram, psram & nand.
This driver is for the sdram memory interface with the SEMC.
+config K210_SRAM
+ bool "Enable Kendryte K210 SRAM support"
+ depends on RAM
+ help
+ The Kendryte K210 has three banks of SRAM. This driver does the
+ necessary initialization.
+
source "drivers/ram/aspeed/Kconfig"
source "drivers/ram/rockchip/Kconfig"
source "drivers/ram/sifive/Kconfig"
diff --git a/drivers/ram/Makefile b/drivers/ram/Makefile
index 209a78c06f..fdc9bbeb1f 100644
--- a/drivers/ram/Makefile
+++ b/drivers/ram/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_ARCH_ASPEED) += aspeed/
obj-$(CONFIG_K3_J721E_DDRSS) += k3-j721e/
obj-$(CONFIG_IMXRT_SDRAM) += imxrt_sdram.o
+obj-$(CONFIG_K210_SRAM) += kendryte.o
obj-$(CONFIG_RAM_SIFIVE) += sifive/
diff --git a/drivers/ram/kendryte.c b/drivers/ram/kendryte.c
new file mode 100644
index 00..50818bf005
--- /dev/null
+++ b/drivers/ram/kendryte.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Sean Anderson
+ */
+
+#include
+#include
+#include
+#include
+
+static int k210_sram_probe(struct udevice *dev)
+{
+ int ret;
+ struct clk_bulk clocks;
+
+ /* Relocate as high as possible to leave more space to load payloads */
+ ret = fdtdec_setup_mem_size_base_highest();
+ if (ret)
+ return ret;
+
+ /* Enable ram bank clocks */
+ ret = clk_get_bulk(dev, );
+ if (ret)
+ return ret;
+
+ ret = clk_enable_bulk();
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int k210_sram_get_info(struct udevice *dev, struct ram_info *info)
+{
+ info->base = gd->ram_base;
+ info->size = gd->ram_size;
+
+ return 0;
+}
+
+static struct ram_ops k210_sram_ops = {
+ .get_info = k210_sram_get_info,
+};
+
+static const struct udevice_id k210_sram_ids[] = {
+ { .compatible = "kendryte,k210-sram" },
+ { }
+};
+
+U_BOOT_DRIVER(fu540_ddr) = {
+ .name = "k210_sram",
+ .id = UCLASS_RAM,
+ .of_match = k210_sram_ids,
+ .ops = _sram_ops,
+ .probe = k210_sram_probe,
+};
--
2.28.0
