soc/intel/jasperlake: Add JSL PMC as 'hidden' PCI device

This change allows treating the PMC as a 'hidden' PCI device on Jasper
Lake, so that the MMIO & I/O resources can be exposed as belonging to
this device, instead of the system agent and LPC/eSPI.

Change-Id: Ie07987c68388d03359c43f64a849dc6e3f94676e
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42018
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/dedede/variants/baseboard/devicetree.cb

@@ -300,7 +300,7 @@ chip soc/intel/jasperlake
 			end
 		end # eSPI Interface
 		device pci 1f.1 on  end # P2SB
-		device pci 1f.2 on  end # Power Management Controller
+		device pci 1f.2 hidden end # Power Management Controller
 		device pci 1f.3 off end # Intel HDA/cAVS
 		device pci 1f.4 off end # SMBus
 		device pci 1f.5 on  end # PCH SPI

src/soc/intel/jasperlake/chip.c

@@ -150,6 +150,7 @@ static struct device_operations cpu_bus_ops = {
 #endif
 };
 
+extern struct device_operations pmc_ops;
 static void soc_enable(struct device *dev)
 {
 	/* Set the operations if it is a special bus type */
@@ -157,6 +158,9 @@ static void soc_enable(struct device *dev)
 		dev->ops = &pci_domain_ops;
 	else if (dev->path.type == DEVICE_PATH_CPU_CLUSTER)
 		dev->ops = &cpu_bus_ops;
+	else if (dev->path.type == DEVICE_PATH_PCI &&
+		 dev->path.pci.devfn == PCH_DEVFN_PMC)
+		dev->ops = &pmc_ops;
 }
 
 struct chip_operations soc_intel_jasperlake_ops = {

src/soc/intel/jasperlake/espi.c

@@ -191,21 +191,4 @@ void lpc_soc_init(struct device *dev)
 	soc_mirror_dmi_pcr_io_dec();
 }
 
-/* Fill up ESPI IO resource structure inside SoC directory */
-void pch_lpc_soc_fill_io_resources(struct device *dev)
-{
-	/*
-	 * PMC pci device gets hidden from PCI bus due to Silicon
-	 * policy hence bind ACPI BASE aka ABASE (offset 0x20) with
-	 * ESPI IO resources to ensure that ABASE falls under PCI reserved
-	 * IO memory range.
-	 *
-	 * Note: Don't add any more resource with same offset 0x20
-	 * under this device space.
-	 */
-	pch_lpc_add_new_resource(dev, PCI_BASE_ADDRESS_4,
-			ACPI_BASE_ADDRESS, ACPI_BASE_SIZE, IORESOURCE_IO |
-			IORESOURCE_ASSIGNED | IORESOURCE_FIXED);
-}
-
 #endif

src/soc/intel/jasperlake/pmc.c

@@ -69,7 +69,7 @@ static void config_deep_sx(uint32_t deepsx_config)
 	write32(pmcbase + DSX_CFG, reg);
 }
 
-static void pmc_init(void *unused)
+static void pmc_init(struct device *dev)
 {
 	const config_t *config = config_of_soc();
 
@@ -85,11 +85,21 @@ static void pmc_init(void *unused)
 	config_deep_sx(config->deep_sx_config);
 }
 
-/*
-* Initialize PMC controller.
-*
-* PMC controller gets hidden from PCI bus during FSP-Silicon init call.
-* Hence PCI enumeration can't be used to initialize bus device and
-* allocate resources.
-*/
-BOOT_STATE_INIT_ENTRY(BS_DEV_INIT_CHIPS, BS_ON_EXIT, pmc_init, NULL);
+static void soc_pmc_read_resources(struct device *dev)
+{
+	struct resource *res;
+
+	mmio_resource(dev, 0, PCH_PWRM_BASE_ADDRESS / KiB, PCH_PWRM_BASE_SIZE / KiB);
+
+	res = new_resource(dev, 1);
+	res->base = (resource_t)ACPI_BASE_ADDRESS;
+	res->size = (resource_t)ACPI_BASE_SIZE;
+	res->limit = res->base + res->size + 1;
+	res->flags = IORESOURCE_IO | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
+}
+
+struct device_operations pmc_ops = {
+	.read_resources		= soc_pmc_read_resources,
+	.set_resources		= noop_set_resources,
+	.enable			= pmc_init,
+};

src/soc/intel/jasperlake/systemagent.c

@@ -23,17 +23,6 @@ void soc_add_fixed_mmio_resources(struct device *dev, int *index)
 		{ EPBAR, EP_BASE_ADDRESS, EP_BASE_SIZE, "EPBAR" },
 		{ REGBAR, REG_BASE_ADDRESS, REG_BASE_SIZE, "REGBAR" },
 		{ EDRAMBAR, EDRAM_BASE_ADDRESS, EDRAM_BASE_SIZE, "EDRAMBAR" },
-		/*
-		 * PMC pci device gets hidden from PCI bus due to Silicon
-		 * policy hence binding PMCBAR aka PWRMBASE (offset 0x10) with
-		 * SA resources to ensure that PMCBAR falls under PCI reserved
-		 * memory range.
-		 *
-		 * Note: Don't add any more resource with same offset 0x10
-		 * under this device space.
-		 */
-		{ PCI_BASE_ADDRESS_0, PCH_PWRM_BASE_ADDRESS, PCH_PWRM_BASE_SIZE,
-				"PMCBAR" },
 	};
 
 	sa_add_fixed_mmio_resources(dev, index, soc_fixed_resources,