src/southbridge/amd/pi/hudson/smi_util.c

   1 /* This file is part of the coreboot project. */
   2 /* SPDX-License-Identifier: GPL-2.0-or-later */
   3
   4 /*
   5  * SMM utilities used in both SMM and normal mode
   6  */
   7
   8 #include <amdblocks/acpimmio.h>
   9 #include <console/console.h>
  10
  11 #include "smi.h"
  12
  13 #define HUDSON_SMI_ACPI_COMMAND         75
  14
  15 static void configure_smi(uint8_t smi_num, uint8_t mode)
  16 {
  17         uint8_t reg32_offset, bit_offset;
  18         uint32_t reg32;
  19
  20         /* SMI sources range from [0:149] */
  21         if (smi_num > 149) {
  22                 printk(BIOS_WARNING, "BUG: Invalid SMI: %u\n", smi_num);
  23                 return;
  24         }
  25
  26         /* 16 sources per register, 2 bits per source; registers are 4 bytes */
  27         reg32_offset = (smi_num / 16) * 4;
  28         bit_offset = (smi_num % 16) * 2;
  29
  30         reg32 = smi_read32(SMI_REG_CONTROL0 + reg32_offset);
  31         reg32 &= ~(0x3 << (bit_offset));
  32         reg32 |= (mode & 0x3) << bit_offset;
  33         smi_write32(SMI_REG_CONTROL0 + reg32_offset, reg32);
  34 }
  35
  36 /**
  37  * Configure generation of interrupts for given GEVENT pin
  38  *
  39  * @param gevent The GEVENT pin number. Valid values are 0 thru 23
  40  * @param mode The type of event this pin should generate. Note that only
  41  *             SMI_MODE_SMI generates an SMI. SMI_MODE_DISABLE disables events.
  42  * @param level SMI_LVL_LOW or SMI_LVL_HIGH
  43  */
  44 void hudson_configure_gevent_smi(uint8_t gevent, uint8_t mode, uint8_t level)
  45 {
  46         uint32_t reg32;
  47         /* GEVENT pins range from [0:23] */
  48         if (gevent > 23) {
  49                 printk(BIOS_WARNING, "BUG: Invalid GEVENT: %u\n", gevent);
  50                 return;
  51         }
  52
  53         /* SMI0 source is GEVENT0 and so on */
  54         configure_smi(gevent, mode);
  55
  56         /* And set set the trigger level */
  57         reg32 = smi_read32(SMI_REG_SMITRIG0);
  58         reg32 &= ~(1 << gevent);
  59         reg32 |= (level & 0x1) << gevent;
  60         smi_write32(SMI_REG_SMITRIG0, reg32);
  61 }
  62
  63 /** Disable events from given GEVENT pin */
  64 void hudson_disable_gevent_smi(uint8_t gevent)
  65 {
  66         /* GEVENT pins range from [0:23] */
  67         if (gevent > 23) {
  68                 printk(BIOS_WARNING, "BUG: Invalid GEVENT: %u\n", gevent);
  69                 return;
  70         }
  71
  72         /* SMI0 source is GEVENT0 and so on */
  73         configure_smi(gevent, SMI_MODE_DISABLE);
  74 }
  75
  76 /** Enable SMIs on writes to ACPI SMI command port */
  77 void hudson_enable_acpi_cmd_smi(void)
  78 {
  79         configure_smi(HUDSON_SMI_ACPI_COMMAND, SMI_MODE_SMI);
  80 }