2 * This file is part of the coreboot project.
4 * Copyright (C) 2008-2009 coresystems GmbH
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; version 2 of
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.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
23 #include <arch/romcc_io.h>
24 #include <console/console.h>
25 #include <cpu/x86/cache.h>
26 #include <cpu/x86/smm.h>
29 // Future TODO: Move to i82801gx directory
30 #include "../../../northbridge/intel/i945/ich7.h"
36 #define ACPI_DISABLE 0x1e
37 #define ACPI_ENABLE 0xe1
41 #define D_OPEN (1 << 6)
42 #define D_CLS (1 << 5)
43 #define D_LCK (1 << 4)
44 #define G_SMRANE (1 << 3)
45 #define C_BASE_SEG ((0 << 2) | (1 << 1) | (0 << 0))
56 #define PM2_CNT 0x20 // mobile only
60 #define EL_SMI_EN (1 << 25) // Intel Quick Resume Technology
61 #define INTEL_USB2_EN (1 << 18) // Intel-Specific USB2 SMI logic
62 #define LEGACY_USB2_EN (1 << 17) // Legacy USB2 SMI logic
63 #define PERIODIC_EN (1 << 14) // SMI on PERIODIC_STS in SMI_STS
64 #define TCO_EN (1 << 13) // Enable TCO Logic (BIOSWE et al)
65 #define MCSMI_EN (1 << 11) // Trap microcontroller range access
66 #define BIOS_RLS (1 << 7) // asserts SCI on bit set
67 #define SWSMI_TMR_EN (1 << 6) // start software smi timer on bit set
68 #define APMC_EN (1 << 5) // Writes to APM_CNT cause SMI#
69 #define SLP_SMI_EN (1 << 4) // Write to SLP_EN in PM1_CNT asserts SMI#
70 #define LEGACY_USB_EN (1 << 3) // Legacy USB circuit SMI logic
71 #define BIOS_EN (1 << 2) // Assert SMI# on setting GBL_RLS bit
72 #define EOS (1 << 1) // End of SMI (deassert SMI#)
73 #define GBL_SMI_EN (1 << 0) // SMI# generation at all?
75 #define ALT_GP_SMI_EN 0x38
76 #define ALT_GP_SMI_STS 0x3a
78 #define DEVACT_STS 0x44
82 #include "i82801gx_nvs.h"
84 /* While we read PMBASE dynamically in case it changed, let's
85 * initialize it with a sane value
87 static u16 pmbase = DEFAULT_PMBASE;
90 * @brief read and clear PM1_STS
91 * @return PM1_STS register
93 static u16 reset_pm1_status(void)
97 reg16 = inw(pmbase + PM1_STS);
98 /* set status bits are cleared by writing 1 to them */
99 outw(reg16, pmbase + PM1_STS);
104 static void dump_pm1_status(u16 pm1_sts)
106 printk_debug("PM1_STS: ");
107 if (pm1_sts & (1 << 15)) printk_debug("WAK ");
108 if (pm1_sts & (1 << 14)) printk_debug("PCIEXPWAK ");
109 if (pm1_sts & (1 << 11)) printk_debug("PRBTNOR ");
110 if (pm1_sts & (1 << 10)) printk_debug("RTC ");
111 if (pm1_sts & (1 << 8)) printk_debug("PWRBTN ");
112 if (pm1_sts & (1 << 5)) printk_debug("GBL ");
113 if (pm1_sts & (1 << 4)) printk_debug("BM ");
114 if (pm1_sts & (1 << 0)) printk_debug("TMROF ");
119 * @brief read and clear SMI_STS
120 * @return SMI_STS register
122 static u32 reset_smi_status(void)
126 reg32 = inl(pmbase + SMI_STS);
127 /* set status bits are cleared by writing 1 to them */
128 outl(reg32, pmbase + SMI_STS);
133 static void dump_smi_status(u32 smi_sts)
135 printk_debug("SMI_STS: ");
136 if (smi_sts & (1 << 26)) printk_debug("SPI ");
137 if (smi_sts & (1 << 25)) printk_debug("EL_SMI ");
138 if (smi_sts & (1 << 21)) printk_debug("MONITOR ");
139 if (smi_sts & (1 << 20)) printk_debug("PCI_EXP_SMI ");
140 if (smi_sts & (1 << 18)) printk_debug("INTEL_USB2 ");
141 if (smi_sts & (1 << 17)) printk_debug("LEGACY_USB2 ");
142 if (smi_sts & (1 << 16)) printk_debug("SMBUS_SMI ");
143 if (smi_sts & (1 << 15)) printk_debug("SERIRQ_SMI ");
144 if (smi_sts & (1 << 14)) printk_debug("PERIODIC ");
145 if (smi_sts & (1 << 13)) printk_debug("TCO ");
146 if (smi_sts & (1 << 12)) printk_debug("DEVMON ");
147 if (smi_sts & (1 << 11)) printk_debug("MCSMI ");
148 if (smi_sts & (1 << 10)) printk_debug("GPI ");
149 if (smi_sts & (1 << 9)) printk_debug("GPE0 ");
150 if (smi_sts & (1 << 8)) printk_debug("PM1 ");
151 if (smi_sts & (1 << 6)) printk_debug("SWSMI_TMR ");
152 if (smi_sts & (1 << 5)) printk_debug("APM ");
153 if (smi_sts & (1 << 4)) printk_debug("SLP_SMI ");
154 if (smi_sts & (1 << 3)) printk_debug("LEGACY_USB ");
155 if (smi_sts & (1 << 2)) printk_debug("BIOS ");
161 * @brief read and clear GPE0_STS
162 * @return GPE0_STS register
164 static u32 reset_gpe0_status(void)
168 reg32 = inl(pmbase + GPE0_STS);
169 /* set status bits are cleared by writing 1 to them */
170 outl(reg32, pmbase + GPE0_STS);
175 static void dump_gpe0_status(u32 gpe0_sts)
178 printk_debug("GPE0_STS: ");
179 for (i=31; i<= 16; i--) {
180 if (gpe0_sts & (1 << i)) printk_debug("GPIO%d ", (i-16));
182 if (gpe0_sts & (1 << 14)) printk_debug("USB4 ");
183 if (gpe0_sts & (1 << 13)) printk_debug("PME_B0 ");
184 if (gpe0_sts & (1 << 12)) printk_debug("USB3 ");
185 if (gpe0_sts & (1 << 11)) printk_debug("PME ");
186 if (gpe0_sts & (1 << 10)) printk_debug("EL_SCI/BATLOW ");
187 if (gpe0_sts & (1 << 9)) printk_debug("PCI_EXP ");
188 if (gpe0_sts & (1 << 8)) printk_debug("RI ");
189 if (gpe0_sts & (1 << 7)) printk_debug("SMB_WAK ");
190 if (gpe0_sts & (1 << 6)) printk_debug("TCO_SCI ");
191 if (gpe0_sts & (1 << 5)) printk_debug("AC97 ");
192 if (gpe0_sts & (1 << 4)) printk_debug("USB2 ");
193 if (gpe0_sts & (1 << 3)) printk_debug("USB1 ");
194 if (gpe0_sts & (1 << 2)) printk_debug("HOT_PLUG ");
195 if (gpe0_sts & (1 << 0)) printk_debug("THRM ");
201 * @brief read and clear TCOx_STS
202 * @return TCOx_STS registers
204 static u32 reset_tco_status(void)
206 u32 tcobase = pmbase + 0x60;
209 reg32 = inl(tcobase + 0x04);
210 /* set status bits are cleared by writing 1 to them */
211 outl(reg32 & ~(1<<18), tcobase + 0x04); // Don't clear BOOT_STS before SECOND_TO_STS
212 if (reg32 & (1 << 18))
213 outl(reg32 & (1<<18), tcobase + 0x04); // clear BOOT_STS
219 static void dump_tco_status(u32 tco_sts)
221 printk_debug("TCO_STS: ");
222 if (tco_sts & (1 << 20)) printk_debug("SMLINK_SLV ");
223 if (tco_sts & (1 << 18)) printk_debug("BOOT ");
224 if (tco_sts & (1 << 17)) printk_debug("SECOND_TO ");
225 if (tco_sts & (1 << 16)) printk_debug("INTRD_DET ");
226 if (tco_sts & (1 << 12)) printk_debug("DMISERR ");
227 if (tco_sts & (1 << 10)) printk_debug("DMISMI ");
228 if (tco_sts & (1 << 9)) printk_debug("DMISCI ");
229 if (tco_sts & (1 << 8)) printk_debug("BIOSWR ");
230 if (tco_sts & (1 << 7)) printk_debug("NEWCENTURY ");
231 if (tco_sts & (1 << 3)) printk_debug("TIMEOUT ");
232 if (tco_sts & (1 << 2)) printk_debug("TCO_INT ");
233 if (tco_sts & (1 << 1)) printk_debug("SW_TCO ");
234 if (tco_sts & (1 << 0)) printk_debug("NMI2SMI ");
239 /* We are using PCIe accesses for now
240 * 1. the chipset can do it
241 * 2. we don't need to worry about how we leave 0xcf8/0xcfc behind
243 #include "../../../northbridge/intel/i945/pcie_config.c"
245 int southbridge_io_trap_handler(int smif)
247 global_nvs_t *gnvs = (global_nvs_t *)0xc00;
251 printk_debug("OS Init\n");
259 /* On success, the IO Trap Handler returns 0
260 * On failure, the IO Trap Handler returns a value != 0
262 * For now, we force the return value to 0 and log all traps to
263 * see what's going on.
266 return 1; /* IO trap handled */
270 * @brief Set the EOS bit
272 void southbridge_smi_set_eos(void)
276 reg8 = inb(pmbase + SMI_EN);
278 outb(reg8, pmbase + SMI_EN);
282 * @brief Interrupt handler for SMI#
284 * @param smm_revision revision of the smm state save map
287 void southbridge_smi_handler(unsigned int node, smm_state_save_area_t *state_save)
292 u32 smi_sts, gpe0_sts, tco_sts;
294 pmbase = pcie_read_config16(PCI_DEV(0, 0x1f, 0), 0x40) & 0xfffc;
295 printk_spew("SMI#: pmbase = 0x%04x\n", pmbase);
297 /* We need to clear the SMI status registers, or we won't see what's
298 * happening in the following calls.
300 smi_sts = reset_smi_status();
301 dump_smi_status(smi_sts);
303 if (smi_sts & (1 << 21)) { // MONITOR
304 global_nvs_t *gnvs = (global_nvs_t *)0xc00;
308 reg32 = RCBA32(0x1e00); // TRSR - Trap Status Register
310 /* Comment in for some useful debug */
311 for (i=0; i<4; i++) {
312 if (reg32 & (1 << i)) {
313 printk_debug(" io trap #%d\n", i);
317 RCBA32(0x1e00) = reg32; // TRSR
319 reg32 = RCBA32(0x1e10);
321 if ((reg32 & 0xfffc) != 0x808) {
322 printk_debug(" trapped io address = 0x%x\n", reg32 & 0xfffc);
323 printk_debug(" AHBE = %x\n", (reg32 >> 16) & 0xf);
324 printk_debug(" read/write: %s\n", (reg32 & (1 << 24)) ? "read" :
328 if (!(reg32 & (1 << 24))) {
330 reg32 = RCBA32(0x1e18);
331 printk_debug(" iotrap written data = 0x%08x\n", reg32);
336 io_trap_handler(gnvs->smif); // call function smif
339 if (smi_sts & (1 << 13)) { // TCO
340 tco_sts = reset_tco_status();
341 dump_tco_status(tco_sts);
343 if (tco_sts & (1 << 8)) { // BIOSWR
346 bios_cntl = pcie_read_config16(PCI_DEV(0, 0x1f, 0), 0xdc);
349 /* BWE is RW, so the SMI was caused by a
350 * write to BWE, not by a write to the BIOS
353 /* This is the place where we notice someone
354 * is trying to tinker with the BIOS. We are
355 * trying to be nice and just ignore it. A more
356 * resolute answer would be to power down the
359 printk_debug("Switching back to RO\n");
360 pcie_write_config32(PCI_DEV(0, 0x1f, 0), 0xdc, (bios_cntl & ~1));
361 } /* No else for now? */
365 if (smi_sts & (1 << 8)) { // PM1
366 pm1_sts = reset_pm1_status();
367 dump_pm1_status(pm1_sts);
370 if (smi_sts & (1 << 9)) { // GPE0
371 gpe0_sts = reset_gpe0_status();
372 dump_gpe0_status(gpe0_sts);
375 if (smi_sts & (1 << 5)) { // APM
376 /* Emulate B2 register as the FADT / Linux expects it */
381 pmctrl = inw(pmbase + 0x04);
383 outw(pmctrl, pmbase + 0x04);
384 printk_debug("SMI#: ACPI disabled.\n");
387 pmctrl = inw(pmbase + 0x04);
389 outw(pmctrl, pmbase + 0x04);
390 printk_debug("SMI#: ACPI enabled.\n");
395 if (smi_sts & (1 << 4)) { // SLP_SMI
398 /* First, disable further SMIs */
399 reg8 = inb(pmbase + SMI_EN);
401 outb(reg8, pmbase + SMI_EN);
403 /* Next, do the deed, we should change
404 * power on after power loss bits here
405 * if we're going to S5
408 /* Write back to the SLP register to cause the
409 * originally intended event again. We need to set BIT13
410 * (SLP_EN) though to make the sleep happen.
412 reg32 = inl(pmbase + 0x04);
413 printk_debug("SMI#: SLP = 0x%08x\n", reg32);
414 printk_debug("SMI#: Powering off.\n");
415 outl(reg32 | (1 << 13), pmbase + 0x04);