// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2015-2018, Intel Corporation.
*/
#define pr_fmt(fmt) "aspeed-kcs-bmc: " fmt
#include <linux/atomic.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/poll.h>
#include <linux/regmap.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include "kcs_bmc_device.h"
#define DEVICE_NAME "ast-kcs-bmc"
#define KCS_CHANNEL_MAX 4
/*
* Field class descriptions
*
* LPCyE Enable LPC channel y
* IBFIEy Input Buffer Full IRQ Enable for LPC channel y
* IRQxEy Assert SerIRQ x for LPC channel y (Deprecated, use IDyIRQX, IRQXEy)
* IDyIRQX Use the specified 4-bit SerIRQ for LPC channel y
* SELyIRQX SerIRQ polarity for LPC channel y (low: 0, high: 1)
* IRQXEy Assert the SerIRQ specified in IDyIRQX for LPC channel y
*/
#define LPC_TYIRQX_LOW 0b00
#define LPC_TYIRQX_HIGH 0b01
#define LPC_TYIRQX_RSVD 0b10
#define LPC_TYIRQX_RISING 0b11
#define LPC_HICR0 0x000
#define LPC_HICR0_LPC3E BIT(7)
#define LPC_HICR0_LPC2E BIT(6)
#define LPC_HICR0_LPC1E BIT(5)
#define LPC_HICR2 0x008
#define LPC_HICR2_IBFIE3 BIT(3)
#define LPC_HICR2_IBFIE2 BIT(2)
#define LPC_HICR2_IBFIE1 BIT(1)
#define LPC_HICR4 0x010
#define LPC_HICR4_LADR12AS BIT(7)
#define LPC_HICR4_KCSENBL BIT(2)
#define LPC_SIRQCR0 0x070
/* IRQ{12,1}E1 are deprecated as of AST2600 A3 but necessary for prior chips */
#define LPC_SIRQCR0_IRQ12E1 BIT(1)
#define LPC_SIRQCR0_IRQ1E1 BIT(0)
#define LPC_HICR5 0x080
#define LPC_HICR5_ID3IRQX_MASK GENMASK(23, 20)
#define LPC_HICR5_ID3IRQX_SHIFT 20
#define LPC_HICR5_ID2IRQX_MASK GENMASK(19, 16)
#define LPC_HICR5_ID2IRQX_SHIFT 16
#define LPC_HICR5_SEL3IRQX BIT(15)
#define LPC_HICR5_IRQXE3 BIT(14)
#define LPC_HICR5_SEL2IRQX BIT(13)
#define LPC_HICR5_IRQXE2 BIT(12)
#define LPC_LADR3H 0x014
#define LPC_LADR3L 0x018
#define LPC_LADR12H 0x01C
#define LPC_LADR12L 0x020
#define LPC_IDR1 0x024
#define LPC_IDR2 0x028
#define LPC_IDR3 0x02C
#define LPC_ODR1 0x030
#define LPC_ODR2 0x034
#define LPC_ODR3 0x038
#define LPC_STR1 0x03C
#define LPC_STR2 0x040
#define LPC_STR3 0x044
#define LPC_HICRB 0x100
#define LPC_HICRB_EN16LADR2 BIT(5)
#define LPC_HICRB_EN16LADR1 BIT(4)
#define LPC_HICRB_IBFIE4 BIT(1)
#define LPC_HICRB_LPC4E BIT(0)
#define LPC_HICRC 0x104
#define LPC_HICRC_ID4IRQX_MASK GENMASK(7, 4)
#define LPC_HICRC_ID4IRQX_SHIFT 4
#define LPC_HICRC_TY4IRQX_MASK GENMASK(3, 2)
#define LPC_HICRC_TY4IRQX_SHIFT 2
#define LPC_HICRC_OBF4_AUTO_CLR BIT(1)
#define LPC_HICRC_IRQXE4 BIT(0)
#define LPC_LADR4 0x110
#define LPC_IDR4 0x114
#define LPC_ODR4 0x118
#define LPC_STR4 0x11C
#define LPC_LSADR12 0x120
#define LPC_LSADR12_LSADR2_MASK GENMASK(31, 16)
#define LPC_LSADR12_LSADR2_SHIFT 16
#define LPC_LSADR12_LSADR1_MASK GENMASK(15, 0)
#define LPC_LSADR12_LSADR1_SHIFT 0
#define OBE_POLL_PERIOD (HZ / 2)
enum aspeed_kcs_irq_mode {
aspeed_kcs_irq_none,
aspeed_kcs_irq_serirq,
};
struct aspeed_kcs_bmc {
struct kcs_bmc_device kcs_bmc;
struct regmap *map;
struct {
enum aspeed_kcs_irq_mode mode;
int id;
} upstream_irq;
struct {
spinlock_t lock;
bool remove;
struct timer_list timer;
} obe;
};
static inline struct aspeed_kcs_bmc *to_aspeed_kcs_bmc(struct kcs_bmc_device *kcs_bmc)
{
return container_of(kcs_bmc, struct aspeed_kcs_bmc, kcs_bmc);
}
static u8 aspeed_kcs_inb(struct kcs_bmc_device *kcs_bmc, u32 reg)
{
struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
u32 val = 0;
int rc;
rc = regmap_read(priv->map, reg, &val);
WARN(rc != 0, "regmap_read() failed: %d\n", rc);
return rc == 0 ? (u8) val : 0;
}
static void aspeed_kcs_outb(struct kcs_bmc_device *kcs_bmc, u32 reg, u8 data)
{
struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
int rc;
rc = regmap_write(priv->map, reg, data);
WARN(rc != 0, "regmap_write() failed: %d\n", rc);
/* Trigger the upstream IRQ on ODR writes, if enabled */
switch (reg) {
case LPC_ODR1:
case LPC_ODR2:
case LPC_ODR3:
case LPC_ODR4:
break;
default:
return;
}
if (priv->upstream_irq.mode != aspeed_kcs_irq_serirq)
return;
switch (kcs_bmc->channel) {
case 1:
switch (priv->upstream_irq.id) {
case 12:
regmap_update_bits(priv->map, LPC_SIRQCR0, LPC_SIRQCR0_IRQ12E1,
LPC_SIRQCR0_IRQ12E1);
break;
case 1:
regmap_update_bits(priv->map, LPC_SIRQCR0, LPC_SIRQCR0_IRQ1E1,
LPC_SIRQCR0_IRQ1E1);
break;
default:
break;
}
break;
case 2:
regmap_update_bits(priv->map, LPC_HICR5, LPC_HICR5_IRQXE2, LPC_HICR5_IRQXE2);
break;
case 3:
regmap_update_bits(priv->map, LPC_HICR5, LPC_HICR5_IRQXE3, LPC_HICR5_IRQXE3);
break;
case 4:
regmap_update_bits(priv->map, LPC_HICRC, LPC_HICRC_IRQXE4, LPC_HICRC_IRQXE4);
break;
default:
break;
}
}
static void aspeed_kcs_updateb(struct kcs_bmc_device *kcs_bmc, u32 reg, u8 mask, u8 val)
{
struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
int rc;
rc = regmap_update_bits(priv->map, reg, mask, val);
WARN(rc != 0, "regmap_update_bits() failed: %d\n", rc);
}
/*
* We note D for Data, and C for Cmd/Status, default rules are
*
* 1. Only the D address is given:
* A. KCS1/KCS2 (D/C: X/X+4)
* D/C: CA0h/CA4h
* D/C: CA8h/CACh
* B. KCS3 (D/C: XX2/XX3h)
* D/C: CA2h/CA3h
* C. KCS4 (D/C: X/X+1)
* D/C: CA4h/CA5h
*
* 2. Both the D/C addresses are given:
* A. KCS1/KCS2/KCS4 (D/C: X/Y)
* D/C: CA0h/CA1h
* D/C: CA8h/CA9h
* D/C: CA4h/CA5h
* B. KCS3 (D/C: XX2/XX3h)
* D/C: CA2h/CA3h
*/
static int aspeed_kcs_set_address(struct kcs_bmc_device *kcs_bmc, u32 addrs[2], int nr_addrs)
{
struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
if (WARN_ON(nr_addrs < 1 || nr_addrs > 2))
return -EINVAL;
switch (priv->kcs_bmc.channel) {
case 1:
regmap_update_bits(priv->map, LPC_HICR4, LPC_HICR4_LADR12AS, 0);
regmap_write(priv->map, LPC_LADR12H, addrs[0] >> 8);
regmap_write(priv->map, LPC_LADR12L, addrs[0] & 0xFF);
if (nr_addrs == 2) {
regmap_update_bits(priv->map, LPC_LSADR12, LPC_LSADR12_LSADR1_MASK,
addrs[1] << LPC_LSADR12_LSADR1_SHIFT);
regmap_update_bits(priv->map, LPC_HICRB, LPC_HICRB_EN16LADR1,
LPC_HICRB_EN16LADR1);
}
break;
case 2:
regmap_update_bits(priv->map, LPC_HICR4, LPC_HICR4_LADR12AS, LPC_HICR4_LADR12AS);
regmap_write(priv->map, LPC_LADR12H, addrs[0] >> 8);
regmap_write(priv->map, LPC_LADR12L, addrs[0] & 0xFF);
if (nr_addrs == 2) {
regmap_update_bits(priv->map, LPC_LSADR12, LPC_LSADR12_LSADR2_MASK,
addrs[1] << LPC_LSADR12_LSADR2_SHIFT);
regmap_update_bits(priv->map, LPC_HICRB, LPC_HICRB_EN16LADR2,
LPC_HICRB_EN16LADR2);
}
break;
case 3:
if (nr_addrs == 2) {
dev_err(priv->kcs_bmc.dev,
"Channel 3 only supports inferred status IO address\n");
return -EINVAL;
}
regmap_write(priv->map, LPC_LADR3H, addrs[0] >> 8);
regmap_write(priv->map, LPC_LADR3L, addrs[0] & 0xFF);
break;
case 4:
if (nr_addrs == 1)
regmap_write(priv->map, LPC_LADR4, ((addrs[0] + 1) << 16) | addrs[0]);
else
regmap_write(priv->map, LPC_LADR4, (addrs[1] << 16) | addrs[0]);
break;
default:
return -EINVAL;
}
return 0;
}
static inline int aspeed_kcs_map_serirq_type(u32 dt_type)
{
switch (dt_type) {
case IRQ_TYPE_EDGE_RISING:
return LPC_TYIRQX_RISING;
case IRQ_TYPE_LEVEL_HIGH:
return LPC_TYIRQX_HIGH;
case IRQ_TYPE_LEVEL_LOW:
return LPC_TYIRQX_LOW;
default:
return -EINVAL;
}
}
static int aspeed_kcs_config_upstream_irq(struct aspeed_kcs_bmc *priv, u32 id, u32 dt_type)
{
unsigned int mask, val, hw_type;
int ret;
if (id > 15)
return -EINVAL;
ret = aspeed_kcs_map_serirq_type(dt_type);
if (ret < 0)
return ret;
hw_type = ret;
priv->upstream_irq.mode = aspeed_kcs_irq_serirq;
priv->upstream_irq.id = id;
switch (priv->kcs_bmc.channel) {
case 1:
/* Needs IRQxE1 rather than (ID1IRQX, SEL1IRQX, IRQXE1) before AST2600 A3 */
break;
case 2:
if (!(hw_type == LPC_TYIRQX_LOW || hw_type == LPC_TYIRQX_HIGH))
return -EINVAL;
mask = LPC_HICR5_SEL2IRQX | LPC_HICR5_ID2IRQX_MASK;
val = (id << LPC_HICR5_ID2IRQX_SHIFT);
val |= (hw_type == LPC_TYIRQX_HIGH) ? LPC_HICR5_SEL2IRQX : 0;
regmap_update_bits(priv->map, LPC_HICR5, mask, val);
break;
case 3:
if (!(hw_type == LPC_TYIRQX_LOW || hw_type == LPC_TYIRQX_HIGH))
return -EINVAL;
mask = LPC_HICR5_SEL3IRQX | LPC_HICR5_ID3IRQX_MASK;
val = (id << LPC_HICR5_ID3IRQX_SHIFT);
val |= (hw_type == LPC_TYIRQX_HIGH) ? LPC_HICR5_SEL3IRQX : 0;
regmap_update_bits(priv->map, LPC_HICR5, mask, val);
break;
case 4:
mask = LPC_HICRC_ID4IRQX_MASK | LPC_HICRC_TY4IRQX_MASK | LPC_HICRC_OBF4_AUTO_CLR;
val = (id << LPC_HICRC_ID4IRQX_SHIFT) | (hw_type << LPC_HICRC_TY4IRQX_SHIFT);
regmap_update_bits(priv->map, LPC_HICRC, mask, val);
break;
default:
dev_warn(priv->kcs_bmc.dev,
"SerIRQ configuration not supported on KCS channel %d\n",
priv->kcs_bmc.channel);
return -EINVAL;
}
return 0;
}
static void aspeed_kcs_enable_channel(struct kcs_bmc_device *kcs_bmc, bool enable)
{
struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
switch (kcs_bmc->channel) {
case 1:
regmap_update_bits(priv->map, LPC_HICR0, LPC_HICR0_LPC1E, enable * LPC_HICR0_LPC1E);
return;
case 2:
regmap_update_bits(priv->map, LPC_HICR0, LPC_HICR0_LPC2E, enable * LPC_HICR0_LPC2E);
return;
case 3:
regmap_update_bits(priv->map, LPC_HICR0, LPC_HICR0_LPC3E, enable * LPC_HICR0_LPC3E);
regmap_update_bits(priv->map, LPC_HICR4,
LPC_HICR4_KCSENBL, enable * LPC_HICR4_KCSENBL);
return;
case 4:
regmap_update_bits(priv->map, LPC_HICRB, LPC_HICRB_LPC4E, enable * LPC_HICRB_LPC4E);
return;
default:
pr_warn("%s: Unsupported channel: %d", __func__, kcs_bmc->channel);
return;
}
}
static void aspeed_kcs_check_obe(struct timer_list *timer)
{
struct aspeed_kcs_bmc *priv = container_of(timer, struct aspeed_kcs_bmc, obe.timer);
unsigned long flags;
u8 str;
spin_lock_irqsave(&priv->obe.lock, flags);
if (priv->obe.remove) {
spin_unlock_irqrestore(&priv->obe.lock, flags);
return;
}
str = aspeed_kcs_inb(&priv->kcs_bmc, priv->kcs_bmc.ioreg.str);
if (str & KCS_BMC_STR_OBF) {
mod_timer(timer, jiffies + OBE_POLL_PERIOD);
spin_unlock_irqrestore(&priv->obe.lock, flags);
return;
}
spin_unlock_irqrestore(&priv->obe.lock, flags);
kcs_bmc_handle_event(&priv->kcs_bmc);
}
static void aspeed_kcs_irq_mask_update(struct kcs_bmc_device *kcs_bmc, u8 mask, u8 state)
{
struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
/* We don't have an OBE IRQ, emulate it */
if (mask & KCS_BMC_EVENT_TYPE_OBE) {
if (KCS_BMC_EVENT_TYPE_OBE & state)
mod_timer(&priv->obe.timer, jiffies + OBE_POLL_PERIOD);
else
del_timer(&priv->obe.timer);
}
if (mask & KCS_BMC_EVENT_TYPE_IBF) {
const bool enable = !!(state & KCS_BMC_EVENT_TYPE_IBF);
switch (kcs_bmc->channel) {
case 1:
regmap_update_bits(priv->map, LPC_HICR2, LPC_HICR2_IBFIE1,
enable * LPC_HICR2_IBFIE1);
return;
case 2:
regmap_update_bits(priv->map, LPC_HICR2, LPC_HICR2_IBFIE2,
enable * LPC_HICR2_IBFIE2);
return;
case 3:
regmap_update_bits(priv->map, LPC_HICR2, LPC_HICR2_IBFIE3,
enable * LPC_HICR2_IBFIE3);
return;
case 4:
regmap_update_bits(priv->map, LPC_HICRB, LPC_HICRB_IBFIE4,
enable * LPC_HICRB_IBFIE4);
return;
default:
pr_warn("%s: Unsupported channel: %d", __func__, kcs_bmc->channel);
return;
}
}
}
static const struct kcs_bmc_device_ops aspeed_kcs_ops = {
.irq_mask_update = aspeed_kcs_irq_mask_update,
.io_inputb = aspeed_kcs_inb,
.io_outputb = aspeed_kcs_outb,
.io_updateb = aspeed_kcs_updateb,
};
static irqreturn_t aspeed_kcs_irq(int irq, void *arg)
{
struct kcs_bmc_device *kcs_bmc = arg;
return kcs_bmc_handle_event(kcs_bmc);
}
static int aspeed_kcs_config_downstream_irq(struct kcs_bmc_device *kcs_bmc,
struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
int irq;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
return devm_request_irq(dev, irq, aspeed_kcs_irq, IRQF_SHARED,
dev_name(dev), kcs_bmc);
}
static const struct kcs_ioreg ast_kcs_bmc_ioregs[KCS_CHANNEL_MAX] = {
{ .idr = LPC_IDR1, .odr = LPC_ODR1, .str = LPC_STR1 },
{ .idr = LPC_IDR2, .odr = LPC_ODR2, .str = LPC_STR2 },
{ .idr = LPC_IDR3, .odr = LPC_ODR3, .str = LPC_STR3 },
{ .idr = LPC_IDR4, .odr = LPC_ODR4, .str = LPC_STR4 },
};
static int aspeed_kcs_of_get_channel(struct platform_device *pdev)
{
struct device_node *np;
struct kcs_ioreg ioreg;
const __be32 *reg;
int i;
np = pdev->dev.of_node;
/* Don't translate addresses, we want offsets for the regmaps */
reg = of_get_address(np, 0, NULL, NULL);
if (!reg)
return -EINVAL;
ioreg.idr = be32_to_cpup(reg);
reg = of_get_address(np, 1, NULL, NULL);
if (!reg)
return -EINVAL;
ioreg.odr = be32_to_cpup(reg);
reg = of_get_address(np, 2, NULL, NULL);
if (!reg)
return -EINVAL;
ioreg.str = be32_to_cpup(reg);
for (i = 0; i < ARRAY_SIZE(ast_kcs_bmc_ioregs); i++) {
if (!memcmp(&ast_kcs_bmc_ioregs[i], &ioreg, sizeof(ioreg)))
return i + 1;
}
return -EINVAL;
}
static int
aspeed_kcs_of_get_io_address(struct platform_device *pdev, u32 addrs[2])
{
int rc;
rc = of_property_read_variable_u32_array(pdev->dev.of_node,
"aspeed,lpc-io-reg",
addrs, 1, 2);
if (rc < 0) {
dev_err(&pdev->dev, "No valid 'aspeed,lpc-io-reg' configured\n");
return rc;
}
if (addrs[0] > 0xffff) {
dev_err(&pdev->dev, "Invalid data address in 'aspeed,lpc-io-reg'\n");
return -EINVAL;
}
if (rc == 2 && addrs[1] > 0xffff) {
dev_err(&pdev->dev, "Invalid status address in 'aspeed,lpc-io-reg'\n");
return -EINVAL;
}
return rc;
}
static int aspeed_kcs_probe(struct platform_device *pdev)
{
struct kcs_bmc_device *kcs_bmc;
struct aspeed_kcs_bmc *priv;
struct device_node *np;
bool have_upstream_irq;
u32 upstream_irq[2];
int rc, channel;
int nr_addrs;
u32 addrs[2];
np = pdev->dev.of_node->parent;
if (!of_device_is_compatible(np, "aspeed,ast2400-lpc-v2") &&
!of_device_is_compatible(np, "aspeed,ast2500-lpc-v2") &&
!of_device_is_compatible(np, "aspeed,ast2600-lpc-v2")) {
dev_err(&pdev->dev, "unsupported LPC device binding\n");
return -ENODEV;
}
channel = aspeed_kcs_of_get_channel(pdev);
if (channel < 0)
return channel;
nr_addrs = aspeed_kcs_of_get_io_address(pdev, addrs);
if (nr_addrs < 0)
return nr_addrs;
np = pdev->dev.of_node;
rc = of_property_read_u32_array(np, "aspeed,lpc-interrupts", upstream_irq, 2);
if (rc && rc != -EINVAL)
return -EINVAL;
have_upstream_irq = !rc;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
kcs_bmc = &priv->kcs_bmc;
kcs_bmc->dev = &pdev->dev;
kcs_bmc->channel = channel;
kcs_bmc->ioreg = ast_kcs_bmc_ioregs[channel - 1];
kcs_bmc->ops = &aspeed_kcs_ops;
priv->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
if (IS_ERR(priv->map)) {
dev_err(&pdev->dev, "Couldn't get regmap\n");
return -ENODEV;
}
spin_lock_init(&priv->obe.lock);
priv->obe.remove = false;
timer_setup(&priv->obe.timer, aspeed_kcs_check_obe, 0);
rc = aspeed_kcs_set_address(kcs_bmc, addrs, nr_addrs);
if (rc)
return rc;
/* Host to BMC IRQ */
rc = aspeed_kcs_config_downstream_irq(kcs_bmc, pdev);
if (rc)
return rc;
/* BMC to Host IRQ */
if (have_upstream_irq) {
rc = aspeed_kcs_config_upstream_irq(priv, upstream_irq[0], upstream_irq[1]);
if (rc < 0)
return rc;
} else {
priv->upstream_irq.mode = aspeed_kcs_irq_none;
}
platform_set_drvdata(pdev, priv);
aspeed_kcs_irq_mask_update(kcs_bmc, (KCS_BMC_EVENT_TYPE_IBF | KCS_BMC_EVENT_TYPE_OBE), 0);
aspeed_kcs_enable_channel(kcs_bmc, true);
rc = kcs_bmc_add_device(&priv->kcs_bmc);
if (rc) {
dev_warn(&pdev->dev, "Failed to register channel %d: %d\n", kcs_bmc->channel, rc);
return rc;
}
dev_info(&pdev->dev, "Initialised channel %d at 0x%x\n",
kcs_bmc->channel, addrs[0]);
return 0;
}
static int aspeed_kcs_remove(struct platform_device *pdev)
{
struct aspeed_kcs_bmc *priv = platform_get_drvdata(pdev);
struct kcs_bmc_device *kcs_bmc = &priv->kcs_bmc;
kcs_bmc_remove_device(kcs_bmc);
aspeed_kcs_enable_channel(kcs_bmc, false);
aspeed_kcs_irq_mask_update(kcs_bmc, (KCS_BMC_EVENT_TYPE_IBF | KCS_BMC_EVENT_TYPE_OBE), 0);
/* Make sure it's proper dead */
spin_lock_irq(&priv->obe.lock);
priv->obe.remove = true;
spin_unlock_irq(&priv->obe.lock);
del_timer_sync(&priv->obe.timer);
return 0;
}
static const struct of_device_id ast_kcs_bmc_match[] = {
{ .compatible = "aspeed,ast2400-kcs-bmc-v2" },
{ .compatible = "aspeed,ast2500-kcs-bmc-v2" },
{ .compatible = "aspeed,ast2600-kcs-bmc" },
{ }
};
MODULE_DEVICE_TABLE(of, ast_kcs_bmc_match);
static struct platform_driver ast_kcs_bmc_driver = {
.driver = {
.name = DEVICE_NAME,
.of_match_table = ast_kcs_bmc_match,
},
.probe = aspeed_kcs_probe,
.remove = aspeed_kcs_remove,
};
module_platform_driver(ast_kcs_bmc_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Haiyue Wang <haiyue.wang@linux.intel.com>");
MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
MODULE_DESCRIPTION("Aspeed device interface to the KCS BMC device");