x86: slimbootloader: Add serial driver
Slim Bootloader provides serial port info thru its HOB list pointer.
All these HOBs are eligible for Slim Bootloader based board only.
- Get serial port information from the serial port info HOB
- Leverage ns16550 driver with slimbootloader specific platform data
Signed-off-by: Aiden Park <aiden.park@intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/slimbootloader/Makefile b/arch/x86/cpu/slimbootloader/Makefile
index 9e6822a..aac9fa3 100644
--- a/arch/x86/cpu/slimbootloader/Makefile
+++ b/arch/x86/cpu/slimbootloader/Makefile
@@ -2,4 +2,4 @@
#
# Copyright (C) 2019 Intel Corporation <www.intel.com>
-obj-y += car.o slimbootloader.o sdram.o
+obj-y += car.o slimbootloader.o sdram.o serial.o
diff --git a/arch/x86/cpu/slimbootloader/serial.c b/arch/x86/cpu/slimbootloader/serial.c
new file mode 100644
index 0000000..7b44a59
--- /dev/null
+++ b/arch/x86/cpu/slimbootloader/serial.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Intel Corporation <www.intel.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <ns16550.h>
+#include <serial.h>
+#include <asm/arch/slimbootloader.h>
+
+/**
+ * The serial port info hob is generated by Slim Bootloader, so eligible for
+ * Slim Bootloader based boards only.
+ */
+static int slimbootloader_serial_ofdata_to_platdata(struct udevice *dev)
+{
+ const efi_guid_t guid = SBL_SERIAL_PORT_INFO_GUID;
+ struct sbl_serial_port_info *data;
+ struct ns16550_platdata *plat = dev->platdata;
+
+ if (!gd->arch.hob_list)
+ panic("hob list not found!");
+
+ data = hob_get_guid_hob_data(gd->arch.hob_list, NULL, &guid);
+ if (!data) {
+ debug("failed to get serial port information\n");
+ return -ENOENT;
+ }
+ debug("type:%d base=0x%08x baudrate=%d stride=%d clk=%d\n",
+ data->type,
+ data->base,
+ data->baud,
+ data->stride,
+ data->clk);
+
+ /*
+ * The data->type provides port io or mmio access type info,
+ * but the access type will be controlled by
+ * CONFIG_SYS_NS16550_PORT_MAPPED or CONFIG_SYS_NS16550_MEM32.
+ *
+ * TBD: ns16550 access type configuration in runtime.
+ * ex) plat->access_type = data->type
+ */
+ plat->base = data->base;
+ /* ns16550 uses reg_shift, then covert stride to shift */
+ plat->reg_shift = data->stride >> 1;
+ plat->clock = data->clk;
+
+ return 0;
+}
+
+static const struct udevice_id slimbootloader_serial_ids[] = {
+ { .compatible = "intel,slimbootloader-uart" },
+ {}
+};
+
+U_BOOT_DRIVER(serial_slimbootloader) = {
+ .name = "serial_slimbootloader",
+ .id = UCLASS_SERIAL,
+ .of_match = slimbootloader_serial_ids,
+ .ofdata_to_platdata = slimbootloader_serial_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
+ .priv_auto_alloc_size = sizeof(struct NS16550),
+ .probe = ns16550_serial_probe,
+ .ops = &ns16550_serial_ops,
+};