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.p...@intel.com>
Reviewed-by: Bin Meng <bmeng...@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevche...@gmail.com>
---
Changes in v6:
* Use EFI_GUID
* Apply code-review comments
Changes in v4:
* Add static keyword in static function
Changes in v3:
* Use HOB function from the common HOB library
arch/x86/cpu/slimbootloader/Makefile | 2 +-
arch/x86/cpu/slimbootloader/serial.c | 67 +++++++++++++++++++
.../asm/arch-slimbootloader/slimbootloader.h | 34 ++++++++++
3 files changed, 102 insertions(+), 1 deletion(-)
create mode 100644 arch/x86/cpu/slimbootloader/serial.c
diff --git a/arch/x86/cpu/slimbootloader/Makefile
b/arch/x86/cpu/slimbootloader/Makefile
index 9e6822a6ec..aac9fa3db8 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 0000000000..7b44a59bff
--- /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,
+};
diff --git a/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h
b/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h
index 4ee8a0627e..174a341d32 100644
--- a/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h
+++ b/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h
@@ -16,6 +16,13 @@
EFI_GUID(0xa1ff7424, 0x7a1a, 0x478e, \
0xa9, 0xe4, 0x92, 0xf3, 0x57, 0xd1, 0x28, 0x32)
+/**
+ * A GUID to get SerialPort info hob which is provided by Slim Bootloader
+ */
+#define SBL_SERIAL_PORT_INFO_GUID \
+ EFI_GUID(0x6c6872fe, 0x56a9, 0x4403, \
+ 0xbb, 0x98, 0x95, 0x8d, 0x62, 0xde, 0x87, 0xf1)
+
/**
* A single entry of memory map information
*
@@ -50,4 +57,31 @@ struct sbl_memory_map_info {
struct sbl_memory_map_entry entry[0];
};
+/**
+ * This includes serial port info which has already been initialized in
previous
+ * Slim Bootloader stage.
+ * The Slim Bootloader initializes serial port regardless of debug/release
build
+ * modes, and it passes the information to a payload thru hob. So, a payload
can
+ * re-use the serial information without re-initializing serial port.
+ *
+ * @rev : revision of serial_port_info structure. currently 1.
+ * @rsvd : padding for alignment
+ * @type : port io: 1, mmio: 2
+ * @base : io base address. ex) 0x3f8, 0x80001000
+ * @baud : uart baud rate
+ * @stride: register stride in Bytes
+ * @clk : uart frequency in Hz
+ * @rsvd1 : reserved
+ */
+struct sbl_serial_port_info {
+ u8 rev;
+ u8 rsvd[3];
+ u32 type;
+ u32 base;
+ u32 baud;
+ u32 stride;
+ u32 clk;
+ u32 rsvd1;
+};
+
#endif /* __SLIMBOOTLOADER_ARCH_H__ */
--
2.20.1
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