Commit d46651d4 authored by Binbin Zhou's avatar Binbin Zhou Committed by Corey Minyard
Browse files

ipmi: Add Loongson-2K BMC support 



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: default avatarChong Qiao <qiaochong@loongson.cn>
Signed-off-by: default avatarChong Qiao <qiaochong@loongson.cn>
Reviewed-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
Acked-by: default avatarCorey Minyard <corey@minyard.net>
Signed-off-by: default avatarBinbin Zhou <zhoubinbin@loongson.cn>
Message-ID: <8f9ffb6f0405345af8f04193ce1510aacd075e72.1756987761.git.zhoubinbin@loongson.cn>
Signed-off-by: default avatarCorey Minyard <corey@minyard.net>
parent bc3a9d21

drivers/char/ipmi/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -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'

drivers/char/ipmi/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/char/ipmi/ipmi_si.h

+7 −0
Original line number Diff line number Diff line
@@ -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);

drivers/char/ipmi/ipmi_si_intf.c

+4 −0
Original line number Diff line number Diff line
@@ -2138,6 +2138,8 @@ static int __init init_ipmi_si(void) 


	ipmi_si_pci_init();



	ipmi_si_ls2k_init();



	ipmi_si_parisc_init();



	mutex_lock(&smi_infos_lock);
@@ -2349,6 +2351,8 @@ static void cleanup_ipmi_si(void) 


	ipmi_si_pci_shutdown();



	ipmi_si_ls2k_shutdown();



	ipmi_si_parisc_shutdown();



	ipmi_si_platform_shutdown();

drivers/char/ipmi/ipmi_si_ls2k.c

0 → 100644
+189 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+

/*

 * Driver for Loongson-2K BMC IPMI interface

 *

 * Copyright (C) 2024-2025 Loongson Technology Corporation Limited.

 *

 * Authors:

 *	Chong Qiao <qiaochong@loongson.cn>

 *	Binbin Zhou <zhoubinbin@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);

}