linux-imx

/*

 * Copyright 2017 Google Inc

 *

 * 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; either version

 * 2 of the License, or (at your option) any later version.

 *

 * Provides a simple driver to control the ASPEED LPC snoop interface which

 * allows the BMC to listen on and save the data written by

 * the host to an arbitrary LPC I/O port.

 *

 * Typically used by the BMC to "watch" host boot progress via port

 * 0x80 writes made by the BIOS during the boot process.

 */

​

#include <linux/bitops.h>

#include <linux/interrupt.h>

#include <linux/fs.h>

#include <linux/kfifo.h>

#include <linux/mfd/syscon.h>

#include <linux/miscdevice.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/poll.h>

#include <linux/regmap.h>

​

#define DEVICE_NAME "aspeed-lpc-snoop"

​

#define NUM_SNOOP_CHANNELS 2

#define SNOOP_FIFO_SIZE 2048

​

#define HICR5   0x0

#define HICR5_EN_SNP0W      BIT(0)

#define HICR5_ENINT_SNP0W   BIT(1)

#define HICR5_EN_SNP1W      BIT(2)

#define HICR5_ENINT_SNP1W   BIT(3)

​

#define HICR6   0x4

#define HICR6_STR_SNP0W     BIT(0)

#define HICR6_STR_SNP1W     BIT(1)

#define SNPWADR 0x10

#define SNPWADR_CH0_MASK    GENMASK(15, 0)

#define SNPWADR_CH0_SHIFT   0

#define SNPWADR_CH1_MASK    GENMASK(31, 16)

#define SNPWADR_CH1_SHIFT   16

#define SNPWDR  0x14

#define SNPWDR_CH0_MASK     GENMASK(7, 0)

#define SNPWDR_CH0_SHIFT    0

#define SNPWDR_CH1_MASK     GENMASK(15, 8)

#define SNPWDR_CH1_SHIFT    8

#define HICRB   0x80

#define HICRB_ENSNP0D       BIT(14)

#define HICRB_ENSNP1D       BIT(15)

​

struct aspeed_lpc_snoop_model_data {

    /* The ast2400 has bits 14 and 15 as reserved, whereas the ast2500

     * can use them.

     */

    unsigned int has_hicrb_ensnp;

};