This patch adds Loongson-2K BMC IPMI support.
According to the existing design, we use software simulation to
implement the KCS interface registers: Stauts/Command/Data_Out/Data_In.
Also since both host side and BMC side read and write kcs status, fifo flag
is used to ensure data consistency.
The single KCS message block is as follows:
+-------------------------------------------------------------------------+
|FIFO flags| KCS register data | CMD data | KCS version | WR REQ | WR ACK |
+-------------------------------------------------------------------------+
Co-developed-by: Chong Qiao <qiaoch...@loongson.cn>
Signed-off-by: Chong Qiao <qiaoch...@loongson.cn>
Reviewed-by: Huacai Chen <chenhua...@loongson.cn>
Acked-by: Corey Minyard <co...@minyard.net>
Signed-off-by: Binbin Zhou <zhoubin...@loongson.cn>
---
MAINTAINERS | 1 +
drivers/char/ipmi/Kconfig | 7 ++
drivers/char/ipmi/Makefile | 1 +
drivers/char/ipmi/ipmi_si.h | 7 ++
drivers/char/ipmi/ipmi_si_intf.c | 4 +
drivers/char/ipmi/ipmi_si_ls2k.c | 189 +++++++++++++++++++++++++++++++
6 files changed, 209 insertions(+)
create mode 100644 drivers/char/ipmi/ipmi_si_ls2k.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 611f2f9acbe2..8779e9eaf296 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14202,6 +14202,7 @@ LOONGSON-2K Board Management Controller (BMC) DRIVER
M: Binbin Zhou <zhoubin...@loongson.cn>
M: Chong Qiao <qiaoch...@loongson.cn>
S: Maintained
+F: drivers/char/ipmi/ipmi_si_ls2k.c
F: drivers/mfd/ls2k-bmc-core.c
LOONGSON EDAC DRIVER
diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig
index f4adc6feb3b2..92bed266d07c 100644
--- a/drivers/char/ipmi/Kconfig
+++ b/drivers/char/ipmi/Kconfig
@@ -84,6 +84,13 @@ config IPMI_IPMB
bus, and it also supports direct messaging on the bus using
IPMB direct messages. This module requires I2C support.
+config IPMI_LS2K
+ bool 'Loongson-2K IPMI interface'
+ depends on LOONGARCH
+ select MFD_LS2K_BMC_CORE
+ help
+ Provides a driver for Loongson-2K IPMI interfaces.
+
config IPMI_POWERNV
depends on PPC_POWERNV
tristate 'POWERNV (OPAL firmware) IPMI interface'
diff --git a/drivers/char/ipmi/Makefile b/drivers/char/ipmi/Makefile
index e0944547c9d0..4ea450a82242 100644
--- a/drivers/char/ipmi/Makefile
+++ b/drivers/char/ipmi/Makefile
@@ -8,6 +8,7 @@ ipmi_si-y := ipmi_si_intf.o ipmi_kcs_sm.o ipmi_smic_sm.o
ipmi_bt_sm.o \
ipmi_si_mem_io.o
ipmi_si-$(CONFIG_HAS_IOPORT) += ipmi_si_port_io.o
ipmi_si-$(CONFIG_PCI) += ipmi_si_pci.o
+ipmi_si-$(CONFIG_IPMI_LS2K) += ipmi_si_ls2k.o
ipmi_si-$(CONFIG_PARISC) += ipmi_si_parisc.o
obj-$(CONFIG_IPMI_HANDLER) += ipmi_msghandler.o
diff --git a/drivers/char/ipmi/ipmi_si.h b/drivers/char/ipmi/ipmi_si.h
index 508c3fd45877..687835b53da5 100644
--- a/drivers/char/ipmi/ipmi_si.h
+++ b/drivers/char/ipmi/ipmi_si.h
@@ -101,6 +101,13 @@ void ipmi_si_pci_shutdown(void);
static inline void ipmi_si_pci_init(void) { }
static inline void ipmi_si_pci_shutdown(void) { }
#endif
+#ifdef CONFIG_IPMI_LS2K
+void ipmi_si_ls2k_init(void);
+void ipmi_si_ls2k_shutdown(void);
+#else
+static inline void ipmi_si_ls2k_init(void) { }
+static inline void ipmi_si_ls2k_shutdown(void) { }
+#endif
#ifdef CONFIG_PARISC
void ipmi_si_parisc_init(void);
void ipmi_si_parisc_shutdown(void);
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index bb42dfe1c6a8..9c38aca16fd0 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -2121,6 +2121,8 @@ static int __init init_ipmi_si(void)
ipmi_si_pci_init();
+ ipmi_si_ls2k_init();
+
ipmi_si_parisc_init();
mutex_lock(&smi_infos_lock);
@@ -2335,6 +2337,8 @@ static void cleanup_ipmi_si(void)
ipmi_si_pci_shutdown();
+ ipmi_si_ls2k_shutdown();
+
ipmi_si_parisc_shutdown();
ipmi_si_platform_shutdown();
diff --git a/drivers/char/ipmi/ipmi_si_ls2k.c b/drivers/char/ipmi/ipmi_si_ls2k.c
new file mode 100644
index 000000000000..45442c257efd
--- /dev/null
+++ b/drivers/char/ipmi/ipmi_si_ls2k.c
@@ -0,0 +1,189 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for Loongson-2K BMC IPMI interface
+ *
+ * Copyright (C) 2024-2025 Loongson Technology Corporation Limited.
+ *
+ * Authors:
+ * Chong Qiao <qiaoch...@loongson.cn>
+ * Binbin Zhou <zhoubin...@loongson.cn>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+#include "ipmi_si.h"
+
+#define LS2K_KCS_FIFO_IBFH 0x0
+#define LS2K_KCS_FIFO_IBFT 0x1
+#define LS2K_KCS_FIFO_OBFH 0x2
+#define LS2K_KCS_FIFO_OBFT 0x3
+
+/* KCS registers */
+#define LS2K_KCS_REG_STS 0x4
+#define LS2K_KCS_REG_DATA_OUT 0x5
+#define LS2K_KCS_REG_DATA_IN 0x6
+#define LS2K_KCS_REG_CMD 0x8
+
+#define LS2K_KCS_CMD_DATA 0xa
+#define LS2K_KCS_VERSION 0xb
+#define LS2K_KCS_WR_REQ 0xc
+#define LS2K_KCS_WR_ACK 0x10
+
+#define LS2K_KCS_STS_OBF BIT(0)
+#define LS2K_KCS_STS_IBF BIT(1)
+#define LS2K_KCS_STS_SMS_ATN BIT(2)
+#define LS2K_KCS_STS_CMD BIT(3)
+
+#define LS2K_KCS_DATA_MASK (LS2K_KCS_STS_OBF | LS2K_KCS_STS_IBF |
LS2K_KCS_STS_CMD)
+
+static bool ls2k_registered;
+
+static unsigned char ls2k_mem_inb_v0(const struct si_sm_io *io, unsigned int
offset)
+{
+ void __iomem *addr = io->addr;
+ int reg_offset;
+
+ if (offset & BIT(0)) {
+ reg_offset = LS2K_KCS_REG_STS;
+ } else {
+ writeb(readb(addr + LS2K_KCS_REG_STS) & ~LS2K_KCS_STS_OBF, addr
+ LS2K_KCS_REG_STS);
+ reg_offset = LS2K_KCS_REG_DATA_OUT;
+ }
+
+ return readb(addr + reg_offset);
+}
+
+static unsigned char ls2k_mem_inb_v1(const struct si_sm_io *io, unsigned int
offset)
+{
+ void __iomem *addr = io->addr;
+ unsigned char inb = 0, cmd;
+ bool obf, ibf;
+
+ obf = readb(addr + LS2K_KCS_FIFO_OBFH) ^ readb(addr +
LS2K_KCS_FIFO_OBFT);
+ ibf = readb(addr + LS2K_KCS_FIFO_IBFH) ^ readb(addr +
LS2K_KCS_FIFO_IBFT);
+ cmd = readb(addr + LS2K_KCS_CMD_DATA);
+
+ if (offset & BIT(0)) {
+ inb = readb(addr + LS2K_KCS_REG_STS) & ~LS2K_KCS_DATA_MASK;
+ inb |= FIELD_PREP(LS2K_KCS_STS_OBF, obf)
+ | FIELD_PREP(LS2K_KCS_STS_IBF, ibf)
+ | FIELD_PREP(LS2K_KCS_STS_CMD, cmd);
+ } else {
+ inb = readb(addr + LS2K_KCS_REG_DATA_OUT);
+ writeb(readb(addr + LS2K_KCS_FIFO_OBFH), addr +
LS2K_KCS_FIFO_OBFT);
+ }
+
+ return inb;
+}
+
+static void ls2k_mem_outb_v0(const struct si_sm_io *io, unsigned int offset,
+ unsigned char val)
+{
+ void __iomem *addr = io->addr;
+ unsigned char sts = readb(addr + LS2K_KCS_REG_STS);
+ int reg_offset;
+
+ if (sts & LS2K_KCS_STS_IBF)
+ return;
+
+ if (offset & BIT(0)) {
+ reg_offset = LS2K_KCS_REG_CMD;
+ sts |= LS2K_KCS_STS_CMD;
+ } else {
+ reg_offset = LS2K_KCS_REG_DATA_IN;
+ sts &= ~LS2K_KCS_STS_CMD;
+ }
+
+ writew(val, addr + reg_offset);
+ writeb(sts | LS2K_KCS_STS_IBF, addr + LS2K_KCS_REG_STS);
+ writel(readl(addr + LS2K_KCS_WR_REQ) + 1, addr + LS2K_KCS_WR_REQ);
+}
+
+static void ls2k_mem_outb_v1(const struct si_sm_io *io, unsigned int offset,
+ unsigned char val)
+{
+ void __iomem *addr = io->addr;
+ unsigned char ibfh, ibft;
+ int reg_offset;
+
+ ibfh = readb(addr + LS2K_KCS_FIFO_IBFH);
+ ibft = readb(addr + LS2K_KCS_FIFO_IBFT);
+
+ if (ibfh ^ ibft)
+ return;
+
+ reg_offset = (offset & BIT(0)) ? LS2K_KCS_REG_CMD :
LS2K_KCS_REG_DATA_IN;
+ writew(val, addr + reg_offset);
+
+ writeb(offset & BIT(0), addr + LS2K_KCS_CMD_DATA);
+ writeb(!ibft, addr + LS2K_KCS_FIFO_IBFH);
+ writel(readl(addr + LS2K_KCS_WR_REQ) + 1, addr + LS2K_KCS_WR_REQ);
+}
+
+static void ls2k_mem_cleanup(struct si_sm_io *io)
+{
+ if (io->addr)
+ iounmap(io->addr);
+}
+
+static int ipmi_ls2k_mem_setup(struct si_sm_io *io)
+{
+ unsigned char version;
+
+ io->addr = ioremap(io->addr_data, io->regspacing);
+ if (!io->addr)
+ return -EIO;
+
+ version = readb(io->addr + LS2K_KCS_VERSION);
+
+ io->inputb = version ? ls2k_mem_inb_v1 : ls2k_mem_inb_v0;
+ io->outputb = version ? ls2k_mem_outb_v1 : ls2k_mem_outb_v0;
+ io->io_cleanup = ls2k_mem_cleanup;
+
+ return 0;
+}
+
+static int ipmi_ls2k_probe(struct platform_device *pdev)
+{
+ struct si_sm_io io;
+
+ memset(&io, 0, sizeof(io));
+
+ io.si_info = &ipmi_kcs_si_info;
+ io.io_setup = ipmi_ls2k_mem_setup;
+ io.addr_data = pdev->resource[0].start;
+ io.regspacing = resource_size(&pdev->resource[0]);
+ io.dev = &pdev->dev;
+
+ dev_dbg(&pdev->dev, "addr 0x%lx, spacing %d.\n", io.addr_data,
io.regspacing);
+
+ return ipmi_si_add_smi(&io);
+}
+
+static void ipmi_ls2k_remove(struct platform_device *pdev)
+{
+ ipmi_si_remove_by_dev(&pdev->dev);
+}
+
+struct platform_driver ipmi_ls2k_platform_driver = {
+ .driver = {
+ .name = "ls2k-ipmi-si",
+ },
+ .probe = ipmi_ls2k_probe,
+ .remove = ipmi_ls2k_remove,
+};
+
+void ipmi_si_ls2k_init(void)
+{
+ platform_driver_register(&ipmi_ls2k_platform_driver);
+ ls2k_registered = true;
+}
+
+void ipmi_si_ls2k_shutdown(void)
+{
+ if (ls2k_registered)
+ platform_driver_unregister(&ipmi_ls2k_platform_driver);
+}
--
2.47.1
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