2 * This file is part of the coreboot project.
4 * Copyright (C) 2008 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"
34 #define ACPI_DISABLE 0x1e
35 #define ACPI_ENABLE 0xe1
39 #define D_OPEN (1 << 6)
40 #define D_CLS (1 << 5)
41 #define D_LCK (1 << 4)
42 #define G_SMRANE (1 << 3)
43 #define C_BASE_SEG ((0 << 2) | (1 << 1) | (0 << 0))
54 #define PM2_CNT 0x20 // mobile only
58 #define EL_SMI_EN (1 << 25) // Intel Quick Resume Technology
59 #define INTEL_USB2_EN (1 << 18) // Intel-Specific USB2 SMI logic
60 #define LEGACY_USB2_EN (1 << 17) // Legacy USB2 SMI logic
61 #define PERIODIC_EN (1 << 14) // SMI on PERIODIC_STS in SMI_STS
62 #define TCO_EN (1 << 13) // Enable TCO Logic (BIOSWE et al)
63 #define MCSMI_EN (1 << 11) // Trap microcontroller range access
64 #define BIOS_RLS (1 << 7) // asserts SCI on bit set
65 #define SWSMI_TMR_EN (1 << 6) // start software smi timer on bit set
66 #define APMC_EN (1 << 5) // Writes to APM_CNT cause SMI#
67 #define SLP_SMI_EN (1 << 4) // Write to SLP_EN in PM1_CNT asserts SMI#
68 #define LEGACY_USB_EN (1 << 3) // Legacy USB circuit SMI logic
69 #define BIOS_EN (1 << 2) // Assert SMI# on setting GBL_RLS bit
70 #define EOS (1 << 1) // End of SMI (deassert SMI#)
71 #define GBL_SMI_EN (1 << 0) // SMI# generation at all?
73 #define ALT_GP_SMI_EN 0x38
74 #define ALT_GP_SMI_STS 0x3a
76 #define DEVACT_STS 0x44
80 #include "i82801gx_nvs.h"
82 /* While we read PMBASE dynamically in case it changed, let's
83 * initialize it with a sane value
85 static u16 pmbase = DEFAULT_PMBASE;
87 typedef enum { SMI_LOCKED, SMI_UNLOCKED } smi_semaphore;
89 /* SMI multiprocessing semaphore */
90 static volatile smi_semaphore smi_handler_status = SMI_UNLOCKED;
92 static int smi_obtain_lock(void)
100 : "=g" (ret), "=m" (smi_handler_status)
105 return (ret == SMI_UNLOCKED);
108 static void smi_release_lock(void)
113 : "=m" (smi_handler_status)
119 #define LAPIC_ID 0xfee00020
120 static inline __attribute__((always_inline)) unsigned long nodeid(void)
122 return (*((volatile unsigned long *)(LAPIC_ID)) >> 24);
127 * @brief read and clear PM1_STS
128 * @return PM1_STS register
130 static u16 reset_pm1_status(void)
134 reg16 = inw(pmbase + PM1_STS);
135 /* set status bits are cleared by writing 1 to them */
136 outw(reg16, pmbase + PM1_STS);
141 static void dump_pm1_status(u16 pm1_sts)
143 printk_debug("PM1_STS: ");
144 if (pm1_sts & (1 << 15)) printk_debug("WAK ");
145 if (pm1_sts & (1 << 14)) printk_debug("PCIEXPWAK ");
146 if (pm1_sts & (1 << 11)) printk_debug("PRBTNOR ");
147 if (pm1_sts & (1 << 10)) printk_debug("RTC ");
148 if (pm1_sts & (1 << 8)) printk_debug("PWRBTN ");
149 if (pm1_sts & (1 << 5)) printk_debug("GBL ");
150 if (pm1_sts & (1 << 4)) printk_debug("BM ");
151 if (pm1_sts & (1 << 0)) printk_debug("TMROF ");
156 * @brief read and clear SMI_STS
157 * @return SMI_STS register
159 static u32 reset_smi_status(void)
163 reg32 = inl(pmbase + SMI_STS);
164 /* set status bits are cleared by writing 1 to them */
165 outl(reg32, pmbase + SMI_STS);
170 static void dump_smi_status(u32 smi_sts)
172 printk_debug("SMI_STS: ");
173 if (smi_sts & (1 << 26)) printk_debug("SPI ");
174 if (smi_sts & (1 << 25)) printk_debug("EL_SMI ");
175 if (smi_sts & (1 << 21)) printk_debug("MONITOR ");
176 if (smi_sts & (1 << 20)) printk_debug("PCI_EXP_SMI ");
177 if (smi_sts & (1 << 18)) printk_debug("INTEL_USB2 ");
178 if (smi_sts & (1 << 17)) printk_debug("LEGACY_USB2 ");
179 if (smi_sts & (1 << 16)) printk_debug("SMBUS_SMI ");
180 if (smi_sts & (1 << 15)) printk_debug("SERIRQ_SMI ");
181 if (smi_sts & (1 << 14)) printk_debug("PERIODIC ");
182 if (smi_sts & (1 << 13)) printk_debug("TCO ");
183 if (smi_sts & (1 << 12)) printk_debug("DEVMON ");
184 if (smi_sts & (1 << 11)) printk_debug("MCSMI ");
185 if (smi_sts & (1 << 10)) printk_debug("GPI ");
186 if (smi_sts & (1 << 9)) printk_debug("GPE0 ");
187 if (smi_sts & (1 << 8)) printk_debug("PM1 ");
188 if (smi_sts & (1 << 6)) printk_debug("SWSMI_TMR ");
189 if (smi_sts & (1 << 5)) printk_debug("APM ");
190 if (smi_sts & (1 << 4)) printk_debug("SLP_SMI ");
191 if (smi_sts & (1 << 3)) printk_debug("LEGACY_USB ");
192 if (smi_sts & (1 << 2)) printk_debug("BIOS ");
198 * @brief read and clear GPE0_STS
199 * @return GPE0_STS register
201 static u32 reset_gpe0_status(void)
205 reg32 = inl(pmbase + GPE0_STS);
206 /* set status bits are cleared by writing 1 to them */
207 outl(reg32, pmbase + GPE0_STS);
212 static void dump_gpe0_status(u32 gpe0_sts)
215 printk_debug("GPE0_STS: ");
216 for (i=31; i<= 16; i--) {
217 if (gpe0_sts & (1 << i)) printk_debug("GPIO%d ", (i-16));
219 if (gpe0_sts & (1 << 14)) printk_debug("USB4 ");
220 if (gpe0_sts & (1 << 13)) printk_debug("PME_B0 ");
221 if (gpe0_sts & (1 << 12)) printk_debug("USB3 ");
222 if (gpe0_sts & (1 << 11)) printk_debug("PME ");
223 if (gpe0_sts & (1 << 10)) printk_debug("EL_SCI/BATLOW ");
224 if (gpe0_sts & (1 << 9)) printk_debug("PCI_EXP ");
225 if (gpe0_sts & (1 << 8)) printk_debug("RI ");
226 if (gpe0_sts & (1 << 7)) printk_debug("SMB_WAK ");
227 if (gpe0_sts & (1 << 6)) printk_debug("TCO_SCI ");
228 if (gpe0_sts & (1 << 5)) printk_debug("AC97 ");
229 if (gpe0_sts & (1 << 4)) printk_debug("USB2 ");
230 if (gpe0_sts & (1 << 3)) printk_debug("USB1 ");
231 if (gpe0_sts & (1 << 2)) printk_debug("HOT_PLUG ");
232 if (gpe0_sts & (1 << 0)) printk_debug("THRM ");
238 * @brief read and clear TCOx_STS
239 * @return TCOx_STS registers
241 static u32 reset_tco_status(void)
243 u32 tcobase = pmbase + 0x60;
246 reg32 = inl(tcobase + 0x04);
247 /* set status bits are cleared by writing 1 to them */
248 outl(reg32 & ~(1<<18), tcobase + 0x04); // Don't clear BOOT_STS before SECOND_TO_STS
249 if (reg32 & (1 << 18))
250 outl(reg32 & (1<<18), tcobase + 0x04); // clear BOOT_STS
256 static void dump_tco_status(u32 tco_sts)
258 printk_debug("TCO_STS: ");
259 if (tco_sts & (1 << 20)) printk_debug("SMLINK_SLV ");
260 if (tco_sts & (1 << 18)) printk_debug("BOOT ");
261 if (tco_sts & (1 << 17)) printk_debug("SECOND_TO ");
262 if (tco_sts & (1 << 16)) printk_debug("INTRD_DET ");
263 if (tco_sts & (1 << 12)) printk_debug("DMISERR ");
264 if (tco_sts & (1 << 10)) printk_debug("DMISMI ");
265 if (tco_sts & (1 << 9)) printk_debug("DMISCI ");
266 if (tco_sts & (1 << 8)) printk_debug("BIOSWR ");
267 if (tco_sts & (1 << 7)) printk_debug("NEWCENTURY ");
268 if (tco_sts & (1 << 3)) printk_debug("TIMEOUT ");
269 if (tco_sts & (1 << 2)) printk_debug("TCO_INT ");
270 if (tco_sts & (1 << 1)) printk_debug("SW_TCO ");
271 if (tco_sts & (1 << 0)) printk_debug("NMI2SMI ");
276 /* ********************* smi_util ************************* */
279 #define UART_RBR 0x00
280 #define UART_TBR 0x00
283 #define UART_IER 0x01
284 #define UART_IIR 0x02
285 #define UART_FCR 0x02
286 #define UART_LCR 0x03
287 #define UART_MCR 0x04
288 #define UART_DLL 0x00
289 #define UART_DLM 0x01
292 #define UART_LSR 0x05
293 #define UART_MSR 0x06
294 #define UART_SCR 0x07
296 static int uart_can_tx_byte(void)
298 return inb(TTYS0_BASE + UART_LSR) & 0x20;
301 static void uart_wait_to_tx_byte(void)
303 while(!uart_can_tx_byte())
307 static void uart_wait_until_sent(void)
309 while(!(inb(TTYS0_BASE + UART_LSR) & 0x40))
313 static void uart_tx_byte(unsigned char data)
315 uart_wait_to_tx_byte();
316 outb(data, TTYS0_BASE + UART_TBR);
317 /* Make certain the data clears the fifos */
318 uart_wait_until_sent();
321 void console_tx_flush(void)
323 uart_wait_to_tx_byte();
326 void console_tx_byte(unsigned char byte)
333 /* We are using PCIe accesses for now
334 * 1. the chipset can do it
335 * 2. we don't need to worry about how we leave 0xcf8/0xcfc behind
337 #include "../../../northbridge/intel/i945/pcie_config.c"
339 /* ********************* smi_util ************************* */
342 void io_trap_handler(int smif)
345 global_nvs_t *gnvs = (global_nvs_t *)0xc00;
347 printk_debug("SMI function trap 0x%x: ", smif);
352 printk_debug("OS Init\n");
355 printk_debug("Get Brightness\n");
361 printk_debug("Unknown function\n");
365 /* On success, the IO Trap Handler returns 0
366 * On failure, the IO Trap Handler returns a value != 0
368 * For now, we force the return value to 0 and log all traps to
369 * see what's going on.
375 * @brief Set the EOS bit
377 static void smi_set_eos(void)
381 reg8 = inb(pmbase + SMI_EN);
383 outb(reg8, pmbase + SMI_EN);
387 * @brief Interrupt handler for SMI#
389 * @param smm_revision revision of the smm state save map
392 void smi_handler(u32 smm_revision)
397 u32 smi_sts, gpe0_sts, tco_sts;
399 smm_state_save_area_t state_save;
401 /* Are we ok to execute the handler? */
402 if (!smi_obtain_lock())
408 console_loglevel = DEFAULT_CONSOLE_LOGLEVEL;
410 console_loglevel = 1;
413 printk_debug("\nSMI# #%d\n", node);
415 switch (smm_revision) {
417 state_save.type = LEGACY;
418 state_save.legacy_state_save = (legacy_smm_state_save_area_t *)
419 (0xa8000 + 0x7e00 - (node * 0x400));
422 state_save.type = EM64T;
423 state_save.em64t_state_save = (em64t_smm_state_save_area_t *)
424 (0xa8000 + 0x7d00 - (node * 0x400));
427 printk_debug("smm_revision: 0x%08x\n", smm_revision);
428 printk_debug("SMI# not supported on your CPU\n");
429 /* Don't release lock, so no further SMI will happen,
430 * if we don't handle it anyways.
435 pmbase = pcie_read_config16(PCI_DEV(0, 0x1f, 0), 0x40) & 0xfffc;
436 printk_spew("SMI#: pmbase = 0x%04x\n", pmbase);
438 /* We need to clear the SMI status registers, or we won't see what's
439 * happening in the following calls.
441 smi_sts = reset_smi_status();
442 dump_smi_status(smi_sts);
444 if (smi_sts & (1 << 21)) { // MONITOR
445 global_nvs_t *gnvs = (global_nvs_t *)0xc00;
449 reg32 = RCBA32(0x1e00); // TRSR - Trap Status Register
451 /* Comment in for some useful debug */
452 for (i=0; i<4; i++) {
453 if (reg32 & (1 << i)) {
454 printk_debug(" io trap #%d\n", i);
458 RCBA32(0x1e00) = reg32; // TRSR
460 reg32 = RCBA32(0x1e10);
462 if ((reg32 & 0xfffc) != 0x808) {
463 printk_debug(" trapped io address = 0x%x\n", reg32 & 0xfffc);
464 printk_debug(" AHBE = %x\n", (reg32 >> 16) & 0xf);
465 printk_debug(" read/write: %s\n", (reg32 & (1 << 24)) ? "read" :
469 if (!(reg32 & (1 << 24))) {
471 reg32 = RCBA32(0x1e18);
472 printk_debug(" iotrap written data = 0x%08x\n", reg32);
477 io_trap_handler(gnvs->smif); // call function smif
480 if (smi_sts & (1 << 13)) { // TCO
481 tco_sts = reset_tco_status();
482 dump_tco_status(tco_sts);
484 if (tco_sts & (1 << 8)) { // BIOSWR
487 bios_cntl = pcie_read_config16(PCI_DEV(0, 0x1f, 0), 0xdc);
490 /* BWE is RW, so the SMI was caused by a
491 * write to BWE, not by a write to the BIOS
494 /* This is the place where we notice someone
495 * is trying to tinker with the BIOS. We are
496 * trying to be nice and just ignore it. A more
497 * resolute answer would be to power down the
500 printk_debug("Switching back to RO\n");
501 pcie_write_config32(PCI_DEV(0, 0x1f, 0), 0xdc, (bios_cntl & ~1));
502 } /* No else for now? */
506 if (smi_sts & (1 << 8)) { // PM1
507 pm1_sts = reset_pm1_status();
508 dump_pm1_status(pm1_sts);
511 if (smi_sts & (1 << 9)) { // GPE0
512 gpe0_sts = reset_gpe0_status();
513 dump_gpe0_status(gpe0_sts);
516 if (smi_sts & (1 << 5)) { // APM
517 /* Emulate B2 register as the FADT / Linux expects it */
522 pmctrl = inw(pmbase + 0x04);
524 outw(pmctrl, pmbase + 0x04);
525 printk_debug("SMI#: ACPI disabled.\n");
528 pmctrl = inw(pmbase + 0x04);
530 outw(pmctrl, pmbase + 0x04);
531 printk_debug("SMI#: ACPI enabled.\n");
536 if (smi_sts & (1 << 4)) { // SLP_SMI
538 reg32 = inl(pmbase + 0x04);
539 printk_debug("SMI#: SLP = 0x%08x\n");
540 printk_debug("SMI#: Powering off.\n");
541 outl((6 << 10), pmbase + 0x04);
542 outl((1 << 13) | (6 << 10), pmbase + 0x04);
543 printk_debug("....\n");
549 /* De-assert SMI# signal to allow another SMI */