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authorTim Wawrzynczak <twawrzynczak@chromium.org>2020-05-18 13:43:19 -0600
committerDuncan Laurie <dlaurie@chromium.org>2020-05-28 23:54:08 +0000
commitc7854b064f7d245f8f25c95f8775c0cfd66f086f (patch)
treec2adddfe0573ed4b988dab623c0791896bcd0ab0 /src/soc
parent90e683b3071030c7f0f56b6bd52dc3bb0d3d9578 (diff)
downloadcoreboot-c7854b064f7d245f8f25c95f8775c0cfd66f086f.tar.xz
soc/intel/tigerlake: Implement soc_get_pmc_mux_device()
The ChromeOS EC is adding new entries to its USBC.CONx devices (see later patch), and it needs to get access to the PMC.MUX device so that its ACPI path can be retrieved. This provides a weak function to return NULL for all Intel SoCs except for Tiger Lake, which locates the device if it is found in the devicetree. Change-Id: I3fe3ef25e9fac8748142f5b1bd870c9bc70b97ff Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/40948 Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/soc')
-rw-r--r--src/soc/intel/common/block/include/intelblocks/pmc.h9
-rw-r--r--src/soc/intel/tigerlake/pmc.c20
2 files changed, 29 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/include/intelblocks/pmc.h b/src/soc/intel/common/block/include/intelblocks/pmc.h
index 329bbe9bd7..75e212740d 100644
--- a/src/soc/intel/common/block/include/intelblocks/pmc.h
+++ b/src/soc/intel/common/block/include/intelblocks/pmc.h
@@ -51,4 +51,13 @@ int pmc_soc_get_resources(struct pmc_resource_config *cfg);
/* API to set ACPI mode */
void pmc_set_acpi_mode(void);
+/*
+ * Returns a reference to the PMC MUX device for the given port number.
+ * Returns NULL if not found or SoC does not support PMC MUX.
+ *
+ * Input: Port number (0-based)
+ * Output: Const pointer to PMC MUX device
+ */
+const struct device *soc_get_pmc_mux_device(int port_number);
+
#endif /* SOC_INTEL_COMMON_BLOCK_PMC_H */
diff --git a/src/soc/intel/tigerlake/pmc.c b/src/soc/intel/tigerlake/pmc.c
index c24898faf3..84a18e3865 100644
--- a/src/soc/intel/tigerlake/pmc.c
+++ b/src/soc/intel/tigerlake/pmc.c
@@ -11,6 +11,7 @@
#include <console/console.h>
#include <device/mmio.h>
#include <device/device.h>
+#include <drivers/intel/pmc_mux/chip.h>
#include <intelblocks/pmc.h>
#include <intelblocks/pmclib.h>
#include <intelblocks/rtc.h>
@@ -123,6 +124,25 @@ static void soc_pmc_fill_ssdt(const struct device *dev)
dev_path(dev));
}
+/* By default, TGL uses the PMC MUX for all ports, so port_number is unused */
+const struct device *soc_get_pmc_mux_device(int port_number)
+{
+ const struct device *pmc;
+ struct device *child;
+
+ child = NULL;
+ pmc = pcidev_path_on_root(PCH_DEVFN_PMC);
+ if (!pmc || !pmc->link_list)
+ return NULL;
+
+ while ((child = dev_bus_each_child(pmc->link_list, child)) != NULL)
+ if (child->chip_ops == &drivers_intel_pmc_mux_ops)
+ break;
+
+ /* child will either be the correct device or NULL if not found */
+ return child;
+}
+
struct device_operations pmc_ops = {
.read_resources = soc_pmc_read_resources,
.set_resources = noop_set_resources,