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// 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);
}
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