From a63398059bdd5911e9e5e670873183cdb376acf7 Mon Sep 17 00:00:00 2001
From: Alexandru Gagniuc <alexandrux.gagniuc@intel.com>
Date: Tue, 5 Apr 2016 12:40:24 -0700
Subject: [PATCH] soc/apollolake/pmutil: Get PMC base address dynamically

Instead of using a hardcoded address for PMC device BAR0, read it
dynamically. This allows the allocator to move the BAR without
needing a fixed resource. Note that we cannot do the same for the
ACPI BAR (index 0x20), as it cannot be read back.

Change-Id: If43e1ccb693ffb17b78bdd76140a0849493a0010
Signed-off-by: Alexandru Gagniuc <alexandrux.gagniuc@intel.com>
Reviewed-on: https://review.coreboot.org/14633
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
---
 src/soc/intel/apollolake/pmutil.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/src/soc/intel/apollolake/pmutil.c b/src/soc/intel/apollolake/pmutil.c
index ce822ffa19..16c8a0459a 100644
--- a/src/soc/intel/apollolake/pmutil.c
+++ b/src/soc/intel/apollolake/pmutil.c
@@ -15,15 +15,23 @@
  * GNU General Public License for more details.
  */
 
+#define __SIMPLE_DEVICE__
+
 #include <arch/io.h>
 #include <console/console.h>
 #include <rules.h>
 #include <device/pci_def.h>
 #include <soc/iomap.h>
+#include <soc/pci_devs.h>
 #include <soc/pm.h>
 #include <device/device.h>
 #include <device/pci.h>
 
+static uintptr_t read_pmc_mmio_bar(void)
+{
+	uint32_t bar = pci_read_config32(PMC_DEV, PCI_BASE_ADDRESS_0);
+	return bar & ~PCI_BASE_ADDRESS_MEM_ATTR_MASK;
+}
 
 static void print_num_status_bits(int num_bits, uint32_t status,
 				  const char * const bit_names[])
@@ -261,13 +269,14 @@ void clear_pmc_status(void)
 {
 	uint32_t prsts;
 	uint32_t gen_pmcon1;
+	uintptr_t pmc_bar0 = read_pmc_mmio_bar();
 
-	prsts = read32((void *)(PMC_BAR0 + PRSTS));
-	gen_pmcon1 = read32((void *)(PMC_BAR0 + GEN_PMCON1));
+	prsts = read32((void *)(pmc_bar0 + PRSTS));
+	gen_pmcon1 = read32((void *)(pmc_bar0 + GEN_PMCON1));
 
 	/* Clear the status bits. The RPS field is cleared on a 0 write. */
-	write32((void *)(PMC_BAR0 + GEN_PMCON1), gen_pmcon1 & ~RPS);
-	write32((void *)(PMC_BAR0 + PRSTS), prsts);
+	write32((void *)(pmc_bar0 + GEN_PMCON1), gen_pmcon1 & ~RPS);
+	write32((void *)(pmc_bar0 + PRSTS), prsts);
 }
 
 
@@ -296,14 +305,16 @@ int chipset_prev_sleep_state(struct chipset_power_state *ps)
 int fill_power_state(struct chipset_power_state *ps)
 {
 	int i;
+	uintptr_t pmc_bar0 = read_pmc_mmio_bar();
+
 	ps->pm1_sts = inw(ACPI_PMIO_BASE + PM1_STS);
 	ps->pm1_en = inw(ACPI_PMIO_BASE + PM1_EN);
 	ps->pm1_cnt = inl(ACPI_PMIO_BASE + PM1_CNT);
 	ps->tco_sts = inl(ACPI_PMIO_BASE + TCO_STS);
-	ps->prsts = read32((void *)(PMC_BAR0 + PRSTS));
-	ps->gen_pmcon1 =read32((void *)(PMC_BAR0 + GEN_PMCON1));
-	ps->gen_pmcon2 = read32((void *)(PMC_BAR0 + GEN_PMCON2));
-	ps->gen_pmcon3 = read32((void *)(PMC_BAR0 + GEN_PMCON3));
+	ps->prsts = read32((void *)(pmc_bar0 + PRSTS));
+	ps->gen_pmcon1 =read32((void *)(pmc_bar0 + GEN_PMCON1));
+	ps->gen_pmcon2 = read32((void *)(pmc_bar0 + GEN_PMCON2));
+	ps->gen_pmcon3 = read32((void *)(pmc_bar0 + GEN_PMCON3));
 
 	ps->prev_sleep_state = chipset_prev_sleep_state(ps);