| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| /* |
| * SMM utilities used in both SMM and normal mode |
| */ |
| |
| #include <amdblocks/acpimmio.h> |
| #include <console/console.h> |
| |
| #include "smi.h" |
| |
| #define HUDSON_SMI_ACPI_COMMAND 75 |
| |
| static void configure_smi(uint8_t smi_num, uint8_t mode) |
| { |
| uint8_t reg32_offset, bit_offset; |
| uint32_t reg32; |
| |
| /* SMI sources range from [0:149] */ |
| if (smi_num > 149) { |
| printk(BIOS_WARNING, "BUG: Invalid SMI: %u\n", smi_num); |
| return; |
| } |
| |
| /* 16 sources per register, 2 bits per source; registers are 4 bytes */ |
| reg32_offset = (smi_num / 16) * 4; |
| bit_offset = (smi_num % 16) * 2; |
| |
| reg32 = smi_read32(SMI_REG_CONTROL0 + reg32_offset); |
| reg32 &= ~(0x3 << (bit_offset)); |
| reg32 |= (mode & 0x3) << bit_offset; |
| smi_write32(SMI_REG_CONTROL0 + reg32_offset, reg32); |
| } |
| |
| /** |
| * Configure generation of interrupts for given GEVENT pin |
| * |
| * @param gevent The GEVENT pin number. Valid values are 0 thru 23 |
| * @param mode The type of event this pin should generate. Note that only |
| * SMI_MODE_SMI generates an SMI. SMI_MODE_DISABLE disables events. |
| * @param level SMI_LVL_LOW or SMI_LVL_HIGH |
| */ |
| void hudson_configure_gevent_smi(uint8_t gevent, uint8_t mode, uint8_t level) |
| { |
| uint32_t reg32; |
| /* GEVENT pins range from [0:23] */ |
| if (gevent > 23) { |
| printk(BIOS_WARNING, "BUG: Invalid GEVENT: %u\n", gevent); |
| return; |
| } |
| |
| /* SMI0 source is GEVENT0 and so on */ |
| configure_smi(gevent, mode); |
| |
| /* And set the trigger level */ |
| reg32 = smi_read32(SMI_REG_SMITRIG0); |
| reg32 &= ~(1 << gevent); |
| reg32 |= (level & 0x1) << gevent; |
| smi_write32(SMI_REG_SMITRIG0, reg32); |
| } |
| |
| /** Disable events from given GEVENT pin */ |
| void hudson_disable_gevent_smi(uint8_t gevent) |
| { |
| /* GEVENT pins range from [0:23] */ |
| if (gevent > 23) { |
| printk(BIOS_WARNING, "BUG: Invalid GEVENT: %u\n", gevent); |
| return; |
| } |
| |
| /* SMI0 source is GEVENT0 and so on */ |
| configure_smi(gevent, SMI_MODE_DISABLE); |
| } |
| |
| /** Enable SMIs on writes to ACPI SMI command port */ |
| void hudson_enable_acpi_cmd_smi(void) |
| { |
| configure_smi(HUDSON_SMI_ACPI_COMMAND, SMI_MODE_SMI); |
| } |