Change in ...coreboot[master]: ec/kontron: Add support for Kontron kempld

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change and it was merged. ( https://review.coreboot.org/c/coreboot/+/29476 )

Change subject: ec/kontron: Add support for Kontron kempld
......................................................................

ec/kontron: Add support for Kontron kempld

A programmable logic device used by Kontron as EC on their COM express
modules. The name `kempld` is taken from Linux kernel sources, as is the
I2C driver. The meaning of the acronym is unclear, probably: Kontron
Embedded Module PLD.

Change-Id: If9a0826c4a8f5c8cd573610c2d10561334258b36
Signed-off-by: Nico Huber 
Reviewed-on: https://review.coreboot.org/c/29476
Tested-by: build bot (Jenkins) 
Reviewed-by: Stefan Reinauer 
---
A src/ec/kontron/kempld/Kconfig
A src/ec/kontron/kempld/Makefile.inc
A src/ec/kontron/kempld/chip.h
A src/ec/kontron/kempld/early_kempld.c
A src/ec/kontron/kempld/kempld.c
A src/ec/kontron/kempld/kempld.h
A src/ec/kontron/kempld/kempld_i2c.c
A src/ec/kontron/kempld/kempld_internal.h
8 files changed, 605 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Stefan Reinauer: Looks good to me, approved

diff --git a/src/ec/kontron/kempld/Kconfig b/src/ec/kontron/kempld/Kconfig
new file mode 100644
index 0000000..647bd12
--- /dev/null
+++ b/src/ec/kontron/kempld/Kconfig
@@ -0,0 +1,5 @@
+config EC_KONTRON_KEMPLD
+	bool
+	help
+	  Driver for Kontron's express module programmable logic device used
+	  on their COMexpress modules.
diff --git a/src/ec/kontron/kempld/Makefile.inc b/src/ec/kontron/kempld/Makefile.inc
new file mode 100644
index 0000000..0d59886
--- /dev/null
+++ b/src/ec/kontron/kempld/Makefile.inc
@@ -0,0 +1,4 @@
+bootblock-$(CONFIG_EC_KONTRON_KEMPLD) += early_kempld.c
+ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += early_kempld.c
+ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += kempld.c
+ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += kempld_i2c.c
diff --git a/src/ec/kontron/kempld/chip.h b/src/ec/kontron/kempld/chip.h
new file mode 100644
index 0000000..7f06937
--- /dev/null
+++ b/src/ec/kontron/kempld/chip.h
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 secunet Security Networks AG
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef EC_KONTRON_KEMPLD_CHIP_H
+#define EC_KONTRON_KEMPLD_CHIP_H
+
+#define KEMPLD_NUM_UARTS 2
+
+enum kempld_uart_io {
+	KEMPLD_UART_3F8 = 0,
+	KEMPLD_UART_2F8 = 1,
+	KEMPLD_UART_3E8 = 2,
+	KEMPLD_UART_2E8 = 3,
+};
+
+struct kempld_uart {
+	enum kempld_uart_io io;
+	unsigned int irq;
+};
+
+struct ec_kontron_kempld_config {
+	struct kempld_uart uart[KEMPLD_NUM_UARTS];
+};
+
+#endif /* EC_KONTRON_KEMPLD_CHIP_H */
diff --git a/src/ec/kontron/kempld/early_kempld.c b/src/ec/kontron/kempld/early_kempld.c
new file mode 100644
index 0000000..773b8b6
--- /dev/null
+++ b/src/ec/kontron/kempld/early_kempld.c
@@ -0,0 +1,72 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 secunet Security Networks AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdint.h>
+#include <arch/io.h>
+#include <delay.h>
+
+#include "chip.h"
+#include "kempld.h"
+#include "kempld_internal.h"
+
+void kempld_write8(const uint8_t addr, const uint8_t data)
+{
+	outb(addr, KEMPLD_IDX);
+	outb(data, KEMPLD_DAT);
+}
+
+uint8_t kempld_read8(const uint8_t addr)
+{
+	outb(addr, KEMPLD_IDX);
+	return inb(KEMPLD_DAT);
+}
+
+int kempld_get_mutex(int timeout_ms)
+{
+	while (inb(KEMPLD_IDX) & KEMPLD_MUTEX_KEY && timeout_ms--)
+		mdelay(1);
+	return timeout_ms;
+}
+
+void kempld_release_mutex(void)
+{
+	outb(KEMPLD_MUTEX_KEY, KEMPLD_IDX);
+}
+
+void kempld_enable_uart_for_console(void)
+{
+	if (!IS_ENABLED(CONFIG_CONSOLE_SERIAL))
+		return;
+
+	if (kempld_get_mutex(100) < 0)
+		return;
+
+	switch (CONFIG_UART_FOR_CONSOLE) {
+	case 0:
+		kempld_write8(KEMPLD_UART_0,
+			      KEMPLD_UART_ENABLE |
+				KEMPLD_UART_3F8 << KEMPLD_UART_IO_SHIFT);
+		break;
+	case 1:
+		kempld_write8(KEMPLD_UART_1,
+			      KEMPLD_UART_ENABLE |
+				KEMPLD_UART_2F8 << KEMPLD_UART_IO_SHIFT);
+		break;
+	default:
+		break;
+	}
+
+	kempld_release_mutex();
+}
diff --git a/src/ec/kontron/kempld/kempld.c b/src/ec/kontron/kempld/kempld.c
new file mode 100644
index 0000000..19c1880
--- /dev/null
+++ b/src/ec/kontron/kempld/kempld.c
@@ -0,0 +1,115 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 secunet Security Networks AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/console.h>
+#include <device/device.h>
+
+#include "chip.h"
+#include "kempld.h"
+#include "kempld_internal.h"
+
+static void kempld_uart_read_resources(struct device *dev)
+{
+	static const unsigned int io_addr[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
+
+	const struct ec_kontron_kempld_config *const config = dev->chip_info;
+
+	struct resource *const res_io = new_resource(dev, 0);
+	struct resource *const res_irq = new_resource(dev, 1);
+	const unsigned int uart = dev->path.generic.subid;
+	if (!config || !res_io || !res_irq || uart >= KEMPLD_NUM_UARTS)
+		return;
+
+	const enum kempld_uart_io io = config->uart[uart].io;
+	if (io >= ARRAY_SIZE(io_addr)) {
+		printk(BIOS_ERR, "KEMPLD: Bad io value '%d' for UART#%u\n.",
+		       io, uart);
+		dev->enabled = false;
+		return;
+	}
+
+	const int irq = config->uart[uart].irq;
+	if (irq >= 16) {
+		printk(BIOS_ERR, "KEMPLD: Bad irq value '%d' for UART#%u\n.",
+		       irq, uart);
+		dev->enabled = false;
+		return;
+	}
+
+	res_io->base = io_addr[io];
+	res_io->size = 8;
+	res_io->flags = IORESOURCE_IO | IORESOURCE_FIXED |
+			IORESOURCE_STORED | IORESOURCE_ASSIGNED;
+	res_irq->base = irq;
+	res_irq->size = 1;
+	res_irq->flags = IORESOURCE_IO | IORESOURCE_FIXED |
+			 IORESOURCE_STORED | IORESOURCE_ASSIGNED;
+
+	if (kempld_get_mutex(100) < 0)
+		return;
+
+	const uint8_t reg = uart ? KEMPLD_UART_1 : KEMPLD_UART_0;
+	const uint8_t val = kempld_read8(reg);
+	kempld_write8(reg, (val & ~(KEMPLD_UART_IO_MASK | KEMPLD_UART_IRQ_MASK))
+			   | io << KEMPLD_UART_IO_SHIFT
+			   | irq << KEMPLD_UART_IRQ_SHIFT);
+
+	kempld_release_mutex();
+}
+
+static void kempld_uart_enable_resources(struct device *dev)
+{
+	if (kempld_get_mutex(100) < 0)
+		return;
+
+	const unsigned int uart = dev->path.generic.subid;
+	const uint8_t reg = uart ? KEMPLD_UART_1 : KEMPLD_UART_0;
+	kempld_write8(reg, kempld_read8(reg) | KEMPLD_UART_ENABLE);
+
+	kempld_release_mutex();
+}
+
+static struct device_operations kempld_uart_ops = {
+	.read_resources   = kempld_uart_read_resources,
+	.enable_resources = kempld_uart_enable_resources,
+};
+
+static void kempld_enable_dev(struct device *const dev)
+{
+	if (dev->path.type == DEVICE_PATH_GENERIC) {
+		switch (dev->path.generic.id) {
+		case 0:
+			if (dev->path.generic.subid < KEMPLD_NUM_UARTS) {
+				dev->ops = &kempld_uart_ops;
+				break;
+			}
+		case 1:
+			if (dev->path.generic.subid == 0) {
+				kempld_i2c_device_init(dev);
+				break;
+			}
+		default:
+			printk(BIOS_WARNING,
+			       "KEMPLD: Spurious device %s.\n",
+			       dev_path(dev));
+			break;
+		}
+	}
+}
+
+struct chip_operations ec_kontron_kempld_ops = {
+	CHIP_NAME("Kontron KEMPLD")
+	.enable_dev = kempld_enable_dev,
+};
diff --git a/src/ec/kontron/kempld/kempld.h b/src/ec/kontron/kempld/kempld.h
new file mode 100644
index 0000000..fe5f54f
--- /dev/null
+++ b/src/ec/kontron/kempld/kempld.h
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 secunet Security Networks AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef EC_KONTRON_KEMPLD_H
+#define EC_KONTRON_KEMPLD_H
+
+#include <stdint.h>
+
+void kempld_write8(uint8_t addr, uint8_t data);
+uint8_t kempld_read8(uint8_t addr);
+
+int kempld_get_mutex(int timeout_ms);
+void kempld_release_mutex(void);
+
+void kempld_enable_uart_for_console(void);
+
+#endif /* EC_KONTRON_KEMPLD_H */
diff --git a/src/ec/kontron/kempld/kempld_i2c.c b/src/ec/kontron/kempld/kempld_i2c.c
new file mode 100644
index 0000000..fdc0b50
--- /dev/null
+++ b/src/ec/kontron/kempld/kempld_i2c.c
@@ -0,0 +1,296 @@
+/*
+ * I2C bus driver for Kontron COM modules
+ *
+ * Copyright (C) 2017 secunet Security Networks AG
+ *
+ * Based on the similar driver in Linux:
+ *
+ * Copyright (c) 2010-2013 Kontron Europe GmbH
+ * Author: Michael Brunner 
+ *
+ * The driver is based on the i2c-ocores driver by Peter Korsgaard.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdint.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/i2c_bus.h>
+#include <timer.h>
+#include <delay.h>
+
+#include "kempld.h"
+#include "kempld_internal.h"
+
+#define KEMPLD_I2C_PRELOW	0x0b
+#define KEMPLD_I2C_PREHIGH	0x0c
+#define KEMPLD_I2C_DATA		0x0e
+
+#define KEMPLD_I2C_CTRL		0x0d
+#define  I2C_CTRL_IEN		0x40
+#define  I2C_CTRL_EN		0x80
+
+#define KEMPLD_I2C_STAT		0x0f
+#define  I2C_STAT_IF		0x01
+#define  I2C_STAT_TIP		0x02
+#define  I2C_STAT_ARBLOST	0x20
+#define  I2C_STAT_BUSY		0x40
+#define  I2C_STAT_NACK		0x80
+
+#define KEMPLD_I2C_CMD		0x0f
+#define  I2C_CMD_START		0x91
+#define  I2C_CMD_STOP		0x41
+#define  I2C_CMD_READ		0x21
+#define  I2C_CMD_WRITE		0x11
+#define  I2C_CMD_READ_ACK	0x21
+#define  I2C_CMD_READ_NACK	0x29
+#define  I2C_CMD_IACK		0x01
+
+#define KEMPLD_I2C_FREQ_MAX	2700	/* 2.7 mHz */
+#define KEMPLD_I2C_FREQ_STD	100	/* 100 kHz */
+
+#define EIO		  5
+#define ENXIO		  6
+#define EAGAIN		 11
+#define EBUSY		 16
+#define ETIMEDOUT	110
+
+enum kempld_i2c_state {
+	STATE_DONE = 0,
+	STATE_INIT,
+	STATE_ADDR,
+	STATE_ADDR10,
+	STATE_START,
+	STATE_WRITE,
+	STATE_READ,
+	STATE_ERROR,
+};
+
+struct kempld_i2c_data {
+	const struct i2c_msg	*msg;
+	size_t			pos;
+	size_t			nmsgs;
+	enum kempld_i2c_state	state;
+};
+
+/*
+ * kempld_get_mutex must be called prior to calling this function.
+ */
+static int kempld_i2c_process(struct kempld_i2c_data *const i2c)
+{
+	u8 stat = kempld_read8(KEMPLD_I2C_STAT);
+	const struct i2c_msg *msg = i2c->msg;
+	u8 addr;
+
+	/* Ready? */
+	if (stat & I2C_STAT_TIP)
+		return -EBUSY;
+
+	if (i2c->state == STATE_DONE || i2c->state == STATE_ERROR) {
+		/* Stop has been sent */
+		kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_IACK);
+		if (i2c->state == STATE_ERROR)
+			return -EIO;
+		return 0;
+	}
+
+	/* Error? */
+	if (stat & I2C_STAT_ARBLOST) {
+		i2c->state = STATE_ERROR;
+		kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_STOP);
+		return -EAGAIN;
+	}
+
+	if (i2c->state == STATE_INIT) {
+		if (stat & I2C_STAT_BUSY)
+			return -EBUSY;
+
+		i2c->state = STATE_ADDR;
+	}
+
+	if (i2c->state == STATE_ADDR) {
+		/* 10 bit address? */
+		if (i2c->msg->flags & I2C_M_TEN) {
+			addr = 0xf0 | ((i2c->msg->slave >> 7) & 0x6);
+			i2c->state = STATE_ADDR10;
+		} else {
+			addr = (i2c->msg->slave << 1);
+			i2c->state = STATE_START;
+		}
+
+		/* Set read bit if necessary */
+		addr |= (i2c->msg->flags & I2C_M_RD) ? 1 : 0;
+
+		kempld_write8(KEMPLD_I2C_DATA, addr);
+		kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_START);
+
+		return 0;
+	}
+
+	/* Second part of 10 bit addressing */
+	if (i2c->state == STATE_ADDR10) {
+		kempld_write8(KEMPLD_I2C_DATA, i2c->msg->slave & 0xff);
+		kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_WRITE);
+
+		i2c->state = STATE_START;
+		return 0;
+	}
+
+	if (i2c->state == STATE_START || i2c->state == STATE_WRITE) {
+		i2c->state = (msg->flags & I2C_M_RD) ? STATE_READ : STATE_WRITE;
+
+		if (stat & I2C_STAT_NACK) {
+			i2c->state = STATE_ERROR;
+			kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_STOP);
+			return -ENXIO;
+		}
+	} else {
+		msg->buf[i2c->pos++] = kempld_read8(KEMPLD_I2C_DATA);
+	}
+
+	if (i2c->pos >= msg->len) {
+		i2c->nmsgs--;
+		i2c->msg++;
+		i2c->pos = 0;
+		msg = i2c->msg;
+
+		if (i2c->nmsgs) {
+			if (!(msg->flags & I2C_M_NOSTART)) {
+				i2c->state = STATE_ADDR;
+				return 0;
+			} else {
+				i2c->state = (msg->flags & I2C_M_RD)
+					? STATE_READ : STATE_WRITE;
+			}
+		} else {
+			i2c->state = STATE_DONE;
+			kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_STOP);
+			return 0;
+		}
+	}
+
+	if (i2c->state == STATE_READ) {
+		kempld_write8(KEMPLD_I2C_CMD, i2c->pos == (msg->len - 1) ?
+			      I2C_CMD_READ_NACK : I2C_CMD_READ_ACK);
+	} else {
+		kempld_write8(KEMPLD_I2C_DATA, msg->buf[i2c->pos++]);
+		kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_WRITE);
+	}
+
+	return 0;
+}
+
+static int kempld_i2c_xfer(struct device *const dev,
+			   const struct i2c_msg *const msgs,
+			   const size_t num)
+{
+	struct kempld_i2c_data i2c;
+	struct stopwatch sw;
+	int ret;
+
+	if (kempld_get_mutex(100) < 0)
+		return -ENXIO;
+
+	i2c.msg = msgs;
+	i2c.pos = 0;
+	i2c.nmsgs = num;
+	i2c.state = STATE_INIT;
+
+	/* Handle the transfer */
+	stopwatch_init_msecs_expire(&sw, 1000);
+	while (!stopwatch_expired(&sw)) {
+		ret = kempld_i2c_process(&i2c);
+
+		if (i2c.state == STATE_DONE || i2c.state == STATE_ERROR) {
+			if (i2c.state == STATE_DONE) {
+				printk(BIOS_SPEW, "kempld_i2c: Processed %zu segments.\n", num);
+				ret = 0;
+			} else {
+				printk(BIOS_INFO, "kempld_i2c: Transfer failed.\n");
+			}
+			goto _release;
+		}
+
+		if (ret == 0)
+			stopwatch_init_msecs_expire(&sw, 1000);
+
+		udelay(10);
+	}
+
+	i2c.state = STATE_ERROR;
+	ret = -ETIMEDOUT;
+	printk(BIOS_INFO, "kempld_i2c: Transfer failed.\n");
+
+_release:
+	kempld_release_mutex();
+	return ret;
+}
+
+static const struct i2c_bus_operations kempld_i2c_bus_ops = {
+	.transfer = kempld_i2c_xfer,
+};
+
+static struct device_operations kempld_i2c_dev_ops = {
+	.scan_bus	= &scan_smbus,
+	.ops_i2c_bus	= &kempld_i2c_bus_ops,
+};
+
+void kempld_i2c_device_init(struct device *const dev)
+{
+	u16 prescale_corr;
+	long prescale;
+	u8 ctrl;
+	u8 stat;
+	u8 cfg;
+
+	if (kempld_get_mutex(100) < 0)
+		return;
+
+	/* Make sure the device is disabled */
+	ctrl = kempld_read8(KEMPLD_I2C_CTRL);
+	ctrl &= ~(I2C_CTRL_EN | I2C_CTRL_IEN);
+	kempld_write8(KEMPLD_I2C_CTRL, ctrl);
+
+	const u8 spec_major = KEMPLD_SPEC_GET_MAJOR(kempld_read8(KEMPLD_SPEC));
+	if (spec_major == 1)
+		prescale = KEMPLD_CLK / (KEMPLD_I2C_FREQ_STD * 5) - 1000;
+	else
+		prescale = KEMPLD_CLK / (KEMPLD_I2C_FREQ_STD * 4) - 3000;
+
+	if (prescale < 0)
+		prescale = 0;
+
+	/* Round to the best matching value */
+	prescale_corr = prescale / 1000;
+	if (prescale % 1000 >= 500)
+		prescale_corr++;
+
+	kempld_write8(KEMPLD_I2C_PRELOW, prescale_corr & 0xff);
+	kempld_write8(KEMPLD_I2C_PREHIGH, prescale_corr >> 8);
+
+	/* Disable I2C bus output on GPIO pins */
+	cfg = kempld_read8(KEMPLD_CFG);
+	cfg &= ~KEMPLD_CFG_GPIO_I2C_MUX;
+	kempld_write8(KEMPLD_CFG, cfg);
+
+	/* Enable the device */
+	kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_IACK);
+	ctrl |= I2C_CTRL_EN;
+	kempld_write8(KEMPLD_I2C_CTRL, ctrl);
+
+	stat = kempld_read8(KEMPLD_I2C_STAT);
+	if (stat & I2C_STAT_BUSY)
+		kempld_write8(KEMPLD_I2C_CMD, I2C_CMD_STOP);
+
+	dev->ops = &kempld_i2c_dev_ops;
+
+	kempld_release_mutex();
+}
diff --git a/src/ec/kontron/kempld/kempld_internal.h b/src/ec/kontron/kempld/kempld_internal.h
new file mode 100644
index 0000000..93351ce
--- /dev/null
+++ b/src/ec/kontron/kempld/kempld_internal.h
@@ -0,0 +1,46 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 secunet Security Networks AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef EC_KONTRON_KEMPLD_INTERNAL_H
+#define EC_KONTRON_KEMPLD_INTERNAL_H
+
+#include <device/device.h>
+
+/* i/o ports */
+#define KEMPLD_IDX		0xa80
+#define  KEMPLD_MUTEX_KEY	0x80
+#define KEMPLD_DAT		0xa81
+
+/* indexed registers */
+#define KEMPLD_SPEC			0x06
+#define  KEMPLD_SPEC_GET_MINOR(x)	(x & 0x0f)
+#define  KEMPLD_SPEC_GET_MAJOR(x)	(x >> 4 & 0x0f)
+
+#define KEMPLD_CFG			0x37
+#define  KEMPLD_CFG_GPIO_I2C_MUX	(1 << 0)
+
+#define KEMPLD_UART_0			0x30
+#define KEMPLD_UART_1			0x31
+#define  KEMPLD_UART_IRQ_SHIFT		0
+#define  KEMPLD_UART_IRQ_MASK		(0xf << KEMPLD_UART_IRQ_SHIFT)
+#define  KEMPLD_UART_IO_SHIFT		4
+#define  KEMPLD_UART_IO_MASK		(0x3 << KEMPLD_UART_IO_SHIFT)
+#define  KEMPLD_UART_ENABLE		0x80
+
+#define KEMPLD_CLK 33333333 /* 33MHz */
+
+void kempld_i2c_device_init(struct device *const dev);
+
+#endif /* EC_KONTRON_KEMPLD_INTERNAL_H */