src/soc/intel/xeon_sp/ibl/soc_pmutil.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 /*
   4  * Helper functions for dealing with power management registers
   5  * and the differences between PCH variants.
   6  */
   7
   8 #define __SIMPLE_DEVICE__
   9
  10 #include <console/console.h>
  11 #include <device/pci.h>
  12 #include <intelblocks/pmclib.h>
  13 #include <intelblocks/rtc.h>
  14 #include <soc/pm.h>
  15 #include <soc/pmc.h>
  16
  17 uint8_t *pmc_mmio_regs(void)
  18 {
  19         /* PMC PWRMBASE can be hidden after FSP-S so can't be accessed using PCI CSR,
  20          * hence use hard-coded address */
  21         return (void *)(uintptr_t)PCH_PWRM_BASE_ADDRESS;
  22 }
  23
  24 uintptr_t soc_read_pmc_base(void)
  25 {
  26         return (uintptr_t)(pmc_mmio_regs());
  27 }
  28
  29 uint32_t *soc_pmc_etr_addr(void)
  30 {
  31         /*
  32          * The pointer returned must not be cached, because the address depends on the
  33          * MMCONF base address and the assigned PCI bus number, which both may change
  34          * during the boot process!
  35          */
  36         return (uint32_t *)(soc_read_pmc_base() + ETR);
  37 }
  38
  39 int soc_get_rtc_failed(void)
  40 {
  41         uint32_t pmcon_b = read32(pmc_mmio_regs() + GEN_PMCON_B);
  42         int rtc_fail = !!(pmcon_b & RTC_BATTERY_DEAD);
  43
  44         if (rtc_fail)
  45                 printk(BIOS_ERR, "%s: RTC battery dead or removed\n", __func__);
  46
  47         return rtc_fail;
  48 }
  49
  50 /*
  51  * Set which power state system will be after reapplying
  52  * the power (from G3 State)
  53  */
  54 void pmc_soc_set_afterg3_en(const bool on)
  55 {
  56         uint8_t reg8;
  57         uint8_t *const pmcbase = pmc_mmio_regs();
  58
  59         reg8 = read8(pmcbase + GEN_PMCON_A);
  60         if (on)
  61                 reg8 &= ~SLEEP_AFTER_POWER_FAIL;
  62         else
  63                 reg8 |= SLEEP_AFTER_POWER_FAIL;
  64         write8(pmcbase + GEN_PMCON_A, reg8);
  65 }
  66
  67 void pmc_lockdown_config(void)
  68 {
  69         /* Make sure payload/OS can't trigger global reset */
  70         pmc_global_reset_disable_and_lock();
  71
  72         /* Lock PMC stretch policy */
  73         pmc_or_mmio32(GEN_PMCON_B, SLP_STR_POL_LOCK);
  74         pmc_or_mmio32(PM_CFG, PMC_LOCK);
  75 }