117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
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/*
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* Juniper Networks Re-Fpga lpc module
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*
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* Copyright (C) 2020 Juniper Networks
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* Author: Ciju Rajan K <crajank@juniper.net>
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*
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* This module implements:
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* - Registering Reboot handler to reset cpu
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* - Reset management port
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include <linux/errno.h>
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#define REFPGA_LPC_BASE_ADDRESS 0xFED50000
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#define REFPGA_LPC_WINDOW_SIZE 0x00000400
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#define REFPGA_MRE_LPCM_RST_CTL_REG (0x3)
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#define REFPGA_MAJOR_VERSION (0x0)
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#define REFPGA_MINOR_VERSION (0x1)
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#define REFPGA_CPU_RESET BIT(0)
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#define REFPGA_MGMT1_PHY_RESET BIT(1)
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static void __iomem *fpga = NULL;
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static int qfx5200_cpu_reset(struct notifier_block *nb,
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unsigned long action,
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void *data)
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{
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int ret = 0;
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switch (action) {
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case SYS_POWER_OFF:
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case SYS_HALT:
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printk(KERN_CRIT "System halt/power_off\n");
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break;
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case SYS_RESTART:
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printk(KERN_CRIT "System restart: qfx5200_cpu_reset\n");
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iowrite8(REFPGA_CPU_RESET, (u8 *)fpga + REFPGA_MRE_LPCM_RST_CTL_REG);
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msleep(100);
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break;
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default:
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/* Do Nothing */
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break;
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block qfx5200_nb = {
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.notifier_call = qfx5200_cpu_reset,
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};
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static int __init refpga_lpcm_init(void)
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{
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u8 major_version = 0x00;
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u8 minor_version = 0x00;
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if (!request_mem_region(REFPGA_LPC_BASE_ADDRESS, REFPGA_LPC_WINDOW_SIZE, "refpga-lpc")) {
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printk(KERN_ERR "Cannot allocate Re-fpga memory region\n");
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return -ENODEV;
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}
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if ((fpga = ioremap(REFPGA_LPC_BASE_ADDRESS, REFPGA_LPC_WINDOW_SIZE)) == NULL) {
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release_mem_region(REFPGA_LPC_BASE_ADDRESS, REFPGA_LPC_WINDOW_SIZE);
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printk(KERN_ERR "Re-Fpga address mapping failed\n");
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return -1;
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}
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major_version = ioread8((u8 *)fpga + REFPGA_MAJOR_VERSION);
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minor_version = ioread8((u8 *)fpga + REFPGA_MINOR_VERSION);
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printk(KERN_INFO "Re-Fpga major version: %x minor version: %x\n", major_version, minor_version);
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/*
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* Register the cpld soft reset handler
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*/
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if(register_reboot_notifier(&qfx5200_nb)) {
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printk(KERN_ALERT "Restart handler registration failed\n");
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}
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iowrite8(REFPGA_MGMT1_PHY_RESET, (u8 *)fpga + REFPGA_MRE_LPCM_RST_CTL_REG);
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return 0;
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}
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static void __exit refpga_lpcm_exit(void)
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{
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iounmap(fpga);
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release_mem_region(REFPGA_LPC_BASE_ADDRESS, REFPGA_LPC_WINDOW_SIZE);
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/*
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* Unregister the cpld soft reset handler
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*/
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if (!unregister_restart_handler(&qfx5200_nb)) {
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printk(KERN_CRIT "Failed to uregister restart handler\n");
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}
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printk(KERN_INFO "Re-Fpga lpcm module removed\n");
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}
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module_init(refpga_lpcm_init);
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module_exit(refpga_lpcm_exit);
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MODULE_DESCRIPTION("Juniper Networks RE-FPGA lpc module");
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MODULE_AUTHOR("Ciju Rajan K <crajank@juniper.net>");
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MODULE_LICENSE("GPL");
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