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