[U-Boot] [RFC PATCH v3 2/7] x86: quark: Add routines to access message bus registers
Bin Meng
bmeng.cn at gmail.com
Mon Feb 2 15:35:24 CET 2015
In the Quark SoC, some chipset commands are accomplished by utilizing
the internal message network within the host bridge (D0:F0). Accesses
to this network are accomplished by populating the message control
register (MCR), Message Control Register eXtension (MCRX) and the
message data register (MDR).
Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
Acked-by: Simon Glass <sjg at chromium.org>
---
Changes in v3:
- Use lower case hex
Changes in v2:
- Add msg_port_setup() and remove MCR_FILL
- Add MSG_BYTE_ENABLE define
- Wrap function declaraion with __ASSEMBLY__
arch/x86/cpu/quark/msg_port.c | 77 +++++++++++++++++++++
arch/x86/include/asm/arch-quark/msg_port.h | 106 +++++++++++++++++++++++++++++
2 files changed, 183 insertions(+)
create mode 100644 arch/x86/cpu/quark/msg_port.c
create mode 100644 arch/x86/include/asm/arch-quark/msg_port.h
diff --git a/arch/x86/cpu/quark/msg_port.c b/arch/x86/cpu/quark/msg_port.c
new file mode 100644
index 0000000..31713e3
--- /dev/null
+++ b/arch/x86/cpu/quark/msg_port.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn at gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <pci.h>
+#include <asm/arch/device.h>
+#include <asm/arch/msg_port.h>
+
+void msg_port_setup(int op, int port, int reg)
+{
+ pci_write_config_dword(QUARK_HOST_BRIDGE, MSG_CTRL_REG,
+ (((op) << 24) | ((port) << 16) |
+ (((reg) << 8) & 0xff00) | MSG_BYTE_ENABLE));
+}
+
+u32 msg_port_read(u8 port, u32 reg)
+{
+ u32 value;
+
+ pci_write_config_dword(QUARK_HOST_BRIDGE, MSG_CTRL_EXT_REG,
+ reg & 0xffffff00);
+ msg_port_setup(MSG_OP_READ, port, reg);
+ pci_read_config_dword(QUARK_HOST_BRIDGE, MSG_DATA_REG, &value);
+
+ return value;
+}
+
+void msg_port_write(u8 port, u32 reg, u32 value)
+{
+ pci_write_config_dword(QUARK_HOST_BRIDGE, MSG_DATA_REG, value);
+ pci_write_config_dword(QUARK_HOST_BRIDGE, MSG_CTRL_EXT_REG,
+ reg & 0xffffff00);
+ msg_port_setup(MSG_OP_WRITE, port, reg);
+}
+
+u32 msg_port_alt_read(u8 port, u32 reg)
+{
+ u32 value;
+
+ pci_write_config_dword(QUARK_HOST_BRIDGE, MSG_CTRL_EXT_REG,
+ reg & 0xffffff00);
+ msg_port_setup(MSG_OP_ALT_READ, port, reg);
+ pci_read_config_dword(QUARK_HOST_BRIDGE, MSG_DATA_REG, &value);
+
+ return value;
+}
+
+void msg_port_alt_write(u8 port, u32 reg, u32 value)
+{
+ pci_write_config_dword(QUARK_HOST_BRIDGE, MSG_DATA_REG, value);
+ pci_write_config_dword(QUARK_HOST_BRIDGE, MSG_CTRL_EXT_REG,
+ reg & 0xffffff00);
+ msg_port_setup(MSG_OP_ALT_WRITE, port, reg);
+}
+
+u32 msg_port_io_read(u8 port, u32 reg)
+{
+ u32 value;
+
+ pci_write_config_dword(QUARK_HOST_BRIDGE, MSG_CTRL_EXT_REG,
+ reg & 0xffffff00);
+ msg_port_setup(MSG_OP_IO_READ, port, reg);
+ pci_read_config_dword(QUARK_HOST_BRIDGE, MSG_DATA_REG, &value);
+
+ return value;
+}
+
+void msg_port_io_write(u8 port, u32 reg, u32 value)
+{
+ pci_write_config_dword(QUARK_HOST_BRIDGE, MSG_DATA_REG, value);
+ pci_write_config_dword(QUARK_HOST_BRIDGE, MSG_CTRL_EXT_REG,
+ reg & 0xffffff00);
+ msg_port_setup(MSG_OP_IO_WRITE, port, reg);
+}
diff --git a/arch/x86/include/asm/arch-quark/msg_port.h b/arch/x86/include/asm/arch-quark/msg_port.h
new file mode 100644
index 0000000..2e78a66
--- /dev/null
+++ b/arch/x86/include/asm/arch-quark/msg_port.h
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn at gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _QUARK_MSG_PORT_H_
+#define _QUARK_MSG_PORT_H_
+
+/*
+ * In the Quark SoC, some chipset commands are accomplished by utilizing
+ * the internal message network within the host bridge (D0:F0). Accesses
+ * to this network are accomplished by populating the message control
+ * register (MCR), Message Control Register eXtension (MCRX) and the
+ * message data register (MDR).
+ */
+#define MSG_CTRL_REG 0xd0 /* Message Control Register */
+#define MSG_DATA_REG 0xd4 /* Message Data Register */
+#define MSG_CTRL_EXT_REG 0xd8 /* Message Control Register EXT */
+
+/* Normal Read/Write OpCodes */
+#define MSG_OP_READ 0x10
+#define MSG_OP_WRITE 0x11
+
+/* Alternative Read/Write OpCodes */
+#define MSG_OP_ALT_READ 0x06
+#define MSG_OP_ALT_WRITE 0x07
+
+/* IO Read/Write OpCodes */
+#define MSG_OP_IO_READ 0x02
+#define MSG_OP_IO_WRITE 0x03
+
+/* All byte enables */
+#define MSG_BYTE_ENABLE 0xf0
+
+#ifndef __ASSEMBLY__
+
+/**
+ * msg_port_setup - set up the message port control register
+ *
+ * @op: message bus access opcode
+ * @port: port number on the message bus
+ * @reg: register number within a port
+ */
+void msg_port_setup(int op, int port, int reg);
+
+/**
+ * msg_port_read - read a message port register using normal opcode
+ *
+ * @port: port number on the message bus
+ * @reg: register number within a port
+ *
+ * @return: message port register value
+ */
+u32 msg_port_read(u8 port, u32 reg);
+
+/**
+ * msg_port_write - write a message port register using normal opcode
+ *
+ * @port: port number on the message bus
+ * @reg: register number within a port
+ * @value: register value to write
+ */
+void msg_port_write(u8 port, u32 reg, u32 value);
+
+/**
+ * msg_port_alt_read - read a message port register using alternative opcode
+ *
+ * @port: port number on the message bus
+ * @reg: register number within a port
+ *
+ * @return: message port register value
+ */
+u32 msg_port_alt_read(u8 port, u32 reg);
+
+/**
+ * msg_port_alt_write - write a message port register using alternative opcode
+ *
+ * @port: port number on the message bus
+ * @reg: register number within a port
+ * @value: register value to write
+ */
+void msg_port_alt_write(u8 port, u32 reg, u32 value);
+
+/**
+ * msg_port_io_read - read a message port register using I/O opcode
+ *
+ * @port: port number on the message bus
+ * @reg: register number within a port
+ *
+ * @return: message port register value
+ */
+u32 msg_port_io_read(u8 port, u32 reg);
+
+/**
+ * msg_port_io_write - write a message port register using I/O opcode
+ *
+ * @port: port number on the message bus
+ * @reg: register number within a port
+ * @value: register value to write
+ */
+void msg_port_io_write(u8 port, u32 reg, u32 value);
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _QUARK_MSG_PORT_H_ */
--
1.8.2.1
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