| Alexandru Gagniuc | 599d668 | 2014-04-17 23:33:50 -0500 | [diff] [blame] | 1 | /* |
| Martin Roth | ebace9f | 2018-05-26 18:56:17 -0600 | [diff] [blame^] | 2 | * This file is part of the coreboot project. |
| Alexandru Gagniuc | 599d668 | 2014-04-17 23:33:50 -0500 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2014 Alexandru Gagniuc <mr.nuke.me@gmail.com> |
| Martin Roth | ebace9f | 2018-05-26 18:56:17 -0600 | [diff] [blame^] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License, or (at your |
| 9 | * option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | */ |
| 16 | |
| 17 | /* |
| 18 | * SMM utilities used in both SMM and normal mode |
| Alexandru Gagniuc | 599d668 | 2014-04-17 23:33:50 -0500 | [diff] [blame] | 19 | */ |
| 20 | |
| 21 | #include "smi.h" |
| 22 | |
| 23 | #include <console/console.h> |
| 24 | |
| 25 | #define HUDSON_SMI_ACPI_COMMAND 75 |
| 26 | |
| 27 | static void configure_smi(uint8_t smi_num, uint8_t mode) |
| 28 | { |
| 29 | uint8_t reg32_offset, bit_offset; |
| 30 | uint32_t reg32; |
| 31 | |
| 32 | /* SMI sources range from [0:149] */ |
| 33 | if (smi_num > 149) { |
| 34 | printk(BIOS_WARNING, "BUG: Invalid SMI: %u\n", smi_num); |
| 35 | return; |
| 36 | } |
| 37 | |
| 38 | /* 16 sources per register, 2 bits per source; registers are 4 bytes */ |
| 39 | reg32_offset = (smi_num / 16) * 4; |
| 40 | bit_offset = (smi_num % 16) * 2; |
| 41 | |
| 42 | reg32 = smi_read32(SMI_REG_CONTROL0 + reg32_offset); |
| 43 | reg32 &= ~(0x3 << (bit_offset)); |
| 44 | reg32 |= (mode & 0x3) << bit_offset; |
| 45 | smi_write32(SMI_REG_CONTROL0 + reg32_offset, reg32); |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Configure generation of interrupts for given GEVENT pin |
| 50 | * |
| 51 | * @param gevent The GEVENT pin number. Valid values are 0 thru 23 |
| 52 | * @param mode The type of event this pin should generate. Note that only |
| 53 | * SMI_MODE_SMI generates an SMI. SMI_MODE_DISABLE disables events. |
| 54 | * @param level SMI_LVL_LOW or SMI_LVL_HIGH |
| 55 | */ |
| 56 | void hudson_configure_gevent_smi(uint8_t gevent, uint8_t mode, uint8_t level) |
| 57 | { |
| 58 | uint32_t reg32; |
| 59 | /* GEVENT pins range from [0:23] */ |
| 60 | if (gevent > 23) { |
| 61 | printk(BIOS_WARNING, "BUG: Invalid GEVENT: %u\n", gevent); |
| 62 | return; |
| 63 | } |
| 64 | |
| 65 | /* SMI0 source is GEVENT0 and so on */ |
| 66 | configure_smi(gevent, mode); |
| 67 | |
| 68 | /* And set set the trigger level */ |
| 69 | reg32 = smi_read32(SMI_REG_SMITRIG0); |
| 70 | reg32 &= ~(1 << gevent); |
| 71 | reg32 |= (level & 0x1) << gevent; |
| 72 | smi_write32(SMI_REG_SMITRIG0, reg32); |
| 73 | } |
| 74 | |
| 75 | /** Disable events from given GEVENT pin */ |
| 76 | void hudson_disable_gevent_smi(uint8_t gevent) |
| 77 | { |
| 78 | /* GEVENT pins range from [0:23] */ |
| 79 | if (gevent > 23) { |
| 80 | printk(BIOS_WARNING, "BUG: Invalid GEVENT: %u\n", gevent); |
| 81 | return; |
| 82 | } |
| 83 | |
| 84 | /* SMI0 source is GEVENT0 and so on */ |
| 85 | configure_smi(gevent, SMI_MODE_DISABLE); |
| 86 | } |
| 87 | |
| 88 | /** Enable SMIs on writes to ACPI SMI command port */ |
| 89 | void hudson_enable_acpi_cmd_smi(void) |
| 90 | { |
| 91 | configure_smi(HUDSON_SMI_ACPI_COMMAND, SMI_MODE_SMI); |
| 92 | } |