// SPDX-License-Identifier: GPL-2.0 /* * SDK7786 FPGA NMI Support. * * Copyright (C) 2010 Paul Mundt */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/string.h> #include <mach/fpga.h> enum { NMI_MODE_MANUAL, NMI_MODE_AUX, NMI_MODE_MASKED, NMI_MODE_ANY, NMI_MODE_UNKNOWN, }; /* * Default to the manual NMI switch. */ static unsigned int __initdata nmi_mode = NMI_MODE_ANY; static int __init nmi_mode_setup(char *str) { if (!str) return 0; if (strcmp(str, "manual") == 0) nmi_mode = NMI_MODE_MANUAL; else if (strcmp(str, "aux") == 0) nmi_mode = NMI_MODE_AUX; else if (strcmp(str, "masked") == 0) nmi_mode = NMI_MODE_MASKED; else if (strcmp(str, "any") == 0) nmi_mode = NMI_MODE_ANY; else { nmi_mode = NMI_MODE_UNKNOWN; pr_warn("Unknown NMI mode %s\n", str); } printk("Set NMI mode to %d\n", nmi_mode); return 0; } early_param("nmi_mode", nmi_mode_setup); void __init sdk7786_nmi_init(void) { unsigned int source, mask, tmp; switch (nmi_mode) { case NMI_MODE_MANUAL: source = NMISR_MAN_NMI; mask = NMIMR_MAN_NMIM; break; case NMI_MODE_AUX: source = NMISR_AUX_NMI; mask = NMIMR_AUX_NMIM; break; case NMI_MODE_ANY: source = NMISR_MAN_NMI | NMISR_AUX_NMI; mask = NMIMR_MAN_NMIM | NMIMR_AUX_NMIM; break; case NMI_MODE_MASKED: case NMI_MODE_UNKNOWN: default: source = mask = 0; break; } /* Set the NMI source */ tmp = fpga_read_reg(NMISR); tmp &= ~NMISR_MASK; tmp |= source; fpga_write_reg(tmp, NMISR); /* And the IRQ masking */ fpga_write_reg(NMIMR_MASK ^ mask, NMIMR); }