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1 /* SPDX-License-Identifier: GPL-2.0-only */
2 
3 #include <device/device.h>
4 #include <device/pci.h>
5 #include <console/console.h>
6 #include <arch/io.h>
7 #include <cpu/intel/smm_reloc.h>
8 #include <cpu/x86/smm.h>
9 
10 #include "pch.h"
11 
smm_southbridge_clear_state(void)12 void smm_southbridge_clear_state(void)
13 {
14 	u32 smi_en;
15 
16 	/* Log events from chipset before clearing */
17 	if (CONFIG(ELOG))
18 		pch_log_state();
19 
20 	smi_en = inl(get_pmbase() + SMI_EN);
21 	if (smi_en & APMC_EN) {
22 		printk(BIOS_INFO, "SMI# handler already enabled?\n");
23 		return;
24 	}
25 
26 	/* Dump and clear status registers */
27 	clear_smi_status();
28 	clear_pm1_status();
29 	clear_tco_status();
30 	clear_gpe_status();
31 }
32 
smm_southbridge_enable(uint16_t pm1_events)33 static void smm_southbridge_enable(uint16_t pm1_events)
34 {
35 	printk(BIOS_DEBUG, "Enabling SMIs.\n");
36 	/* Configure events */
37 	enable_pm1(pm1_events);
38 	disable_gpe(PME_B0_EN);
39 
40 	/* Enable SMI generation:
41 	 *  - on APMC writes (io 0xb2)
42 	 *  - on writes to SLP_EN (sleep states)
43 	 *  - on writes to GBL_RLS (bios commands)
44 	 * No SMIs:
45 	 *  - on microcontroller writes (io 0x62/0x66)
46 	 *  - on TCO events
47 	 */
48 	enable_smi(APMC_EN | SLP_SMI_EN | GBL_SMI_EN | EOS);
49 }
50 
global_smi_enable(void)51 void global_smi_enable(void)
52 {
53 	smm_southbridge_enable(PWRBTN_EN | GBL_EN);
54 }
55