device/xhci: Add functions to work with resource pointers

The XHCI device functions currently use functions that require a
access to the device tree. Create variant of these functions that can
operate with a resource* as an argument and refactor the existing
device*-based functions to operate by calling the resource*-based
variants. This is useful for stages like SMM that may not have access to
the device tree.

BRANCH=guybrush
BUG=b:186792595
TEST=Ran on skyrim device, verified that XHCI ACPI tables are still
generated correctly.

Change-Id: If5a74f9529d5dc6031ec968ef5f40a9cad5ffbc4
Signed-off-by: Robert Zieba <robertzieba@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69914
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

4 files changed, 140 insertions, 95 deletions

diff --git a/src/device/Makefile.inc b/src/device/Makefile.inc
index 3018ef9626..7da6ea85d3 100644
--- a/src/device/Makefile.inc
+++ b/src/device/Makefile.inc
@@ -61,7 +61,8 @@ ramstage-y += mmio.c
 ramstage-y += resource_allocator_common.c
 ramstage-y += resource_allocator_v4.c
 
-ramstage-$(CONFIG_XHCI_UTILS) += xhci.c
+ramstage-$(CONFIG_XHCI_UTILS) += xhci.c xhci_resource.c
+smm-$(CONFIG_XHCI_UTILS) += xhci_resource.c
 
 ramstage-y += gpio.c
 ramstage-y += mdio.c
diff --git a/src/device/xhci.c b/src/device/xhci.c
index f7c5958a6c..0961d0c988 100644
--- a/src/device/xhci.c
+++ b/src/device/xhci.c
@@ -2,31 +2,18 @@
 
 #include <console/console.h>
 #include <device/mmio.h>
+#include <device/device.h>
 #include <device/pci_def.h>
 #include <device/xhci.h>
-#include <string.h>
-
-union xhci_ext_caps_header {
-	uint32_t val;
-	struct {
-		uint32_t cap_id : 8;
-		uint32_t next_ptr : 8;
-		uint32_t reserved : 16;
-	};
-};
 
 enum cb_err xhci_for_each_ext_cap(const struct device *device, void *context,
 				  void (*callback)(void *context,
 						   const struct xhci_ext_cap *cap))
 {
-	struct resource *res;
-	uint32_t *ext_cap_ptr;
-	uint32_t ext_caps_word_offset;
-	union xhci_ext_caps_header header;
-	struct xhci_ext_cap cap;
+	const struct resource *res;
 
-	if (!device || !callback)
-		return CB_ERR_ARG;
+	if (!device)
+		return CB_ERR;
 
 	res = probe_resource(device, PCI_BASE_ADDRESS_0);
 	if (!res) {
@@ -35,89 +22,24 @@ enum cb_err xhci_for_each_ext_cap(const struct device *device, void *context,
 		return CB_ERR;
 	}
 
-	if (!(res->flags & IORESOURCE_ASSIGNED)) {
-		printk(BIOS_ERR, "%s: BAR is not assigned\n", __func__);
-		return CB_ERR;
-	}
-
-	if (res->limit > 0xFFFFFFFF) {
-		printk(BIOS_ERR, "%s: 64-bit BAR is not supported\n", __func__);
-		return CB_ERR;
-	}
-
-	ext_caps_word_offset = read16(res2mmio(res, XHCI_HCCPARAMS1_XECP, 0));
-
-	if (!ext_caps_word_offset) {
-		printk(BIOS_ERR, "%s: No extended capabilities defined\n", __func__);
-		return CB_ERR;
-	}
-
-	ext_cap_ptr = res2mmio(res, ext_caps_word_offset << 2, 0);
-
-	while ((uintptr_t)ext_cap_ptr < (uintptr_t)res->limit) {
-		header.val = read32(ext_cap_ptr);
-
-		cap.cap_id = header.cap_id;
-
-		if (header.cap_id == XHCI_ECP_CAP_ID_SUPP) {
-			cap.supported_protocol.reg0 = header.val;
-			cap.supported_protocol.reg1 = read32(ext_cap_ptr + 1);
-			cap.supported_protocol.reg2 = read32(ext_cap_ptr + 2);
-		}
-
-		callback(context, &cap);
-
-		if (!header.next_ptr)
-			break;
-
-		ext_cap_ptr += header.next_ptr;
-	}
-
-	return CB_SUCCESS;
-}
-
-struct supported_usb_cap_context {
-	void *context;
-	void (*callback)(void *context, const struct xhci_supported_protocol *data);
-};
-
-static void xhci_supported_usb_cap_handler(void *context, const struct xhci_ext_cap *cap)
-{
-	const struct xhci_supported_protocol *data;
-	struct supported_usb_cap_context *internal_context = context;
-
-	if (cap->cap_id != XHCI_ECP_CAP_ID_SUPP)
-		return;
-
-	data = &cap->supported_protocol;
-
-	if (memcmp(data->name, "USB ", 4)) {
-		printk(BIOS_DEBUG, "%s: Unknown Protocol: %.*s\n", __func__,
-		       (int)sizeof(data->name), data->name);
-		return;
-	}
-
-	internal_context->callback(internal_context->context, data);
+	return xhci_resource_for_each_ext_cap(res, context, callback);
 }
 
 enum cb_err xhci_for_each_supported_usb_cap(
 	const struct device *device, void *context,
 	void (*callback)(void *context, const struct xhci_supported_protocol *data))
 {
-	struct supported_usb_cap_context internal_context = {
-		.context = context,
-		.callback = callback,
-	};
+	const struct resource *res;
 
-	return xhci_for_each_ext_cap(device, &internal_context, xhci_supported_usb_cap_handler);
-}
+	if (!device)
+		return CB_ERR;
 
-void xhci_print_supported_protocol(const struct xhci_supported_protocol *supported_protocol)
-{
-	printk(BIOS_DEBUG, "xHCI Supported Protocol:\n");
-	printk(BIOS_DEBUG, "  Major: %#x, Minor: %#x, Protocol: '%.*s'\n",
-	       supported_protocol->major_rev, supported_protocol->minor_rev,
-	       (int)sizeof(supported_protocol->name), supported_protocol->name);
-	printk(BIOS_DEBUG, "  Port Offset: %d, Port Count: %d\n",
-	       supported_protocol->port_offset, supported_protocol->port_count);
+	res = probe_resource(device, PCI_BASE_ADDRESS_0);
+	if (!res) {
+		printk(BIOS_ERR, "%s: Unable to find BAR resource for %s\n", __func__,
+		       dev_path(device));
+		return CB_ERR;
+	}
+
+	return xhci_resource_for_each_supported_usb_cap(res, context, callback);
 }
diff --git a/src/device/xhci_resource.c b/src/device/xhci_resource.c
new file mode 100644
index 0000000000..31f2610823
--- /dev/null
+++ b/src/device/xhci_resource.c
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <arch/mmio.h>
+#include <console/console.h>
+#include <device/pci_def.h>
+#include <device/xhci.h>
+#include <string.h>
+
+union xhci_ext_caps_header {
+	uint32_t val;
+	struct {
+		uint32_t cap_id : 8;
+		uint32_t next_ptr : 8;
+		uint32_t reserved : 16;
+	};
+};
+
+enum cb_err xhci_resource_for_each_ext_cap(const struct resource *res, void *context,
+				  void (*callback)(void *context,
+						   const struct xhci_ext_cap *cap))
+{
+	uint32_t *ext_cap_ptr;
+	uint32_t ext_caps_word_offset;
+	union xhci_ext_caps_header header;
+	struct xhci_ext_cap cap;
+
+	if (!res || !callback)
+		return CB_ERR_ARG;
+
+	if (!(res->flags & IORESOURCE_ASSIGNED)) {
+		printk(BIOS_ERR, "%s: BAR is not assigned\n", __func__);
+		return CB_ERR;
+	}
+
+	if (res->limit > 0xFFFFFFFF) {
+		printk(BIOS_ERR, "%s: 64-bit BAR is not supported\n", __func__);
+		return CB_ERR;
+	}
+
+	ext_caps_word_offset = read16(res2mmio(res, XHCI_HCCPARAMS1_XECP, 0));
+
+	if (!ext_caps_word_offset) {
+		printk(BIOS_ERR, "%s: No extended capabilities defined\n", __func__);
+		return CB_ERR;
+	}
+
+	ext_cap_ptr = res2mmio(res, ext_caps_word_offset << 2, 0);
+
+	while ((uintptr_t)ext_cap_ptr < (uintptr_t)res->limit) {
+		header.val = read32(ext_cap_ptr);
+
+		cap.cap_id = header.cap_id;
+
+		if (header.cap_id == XHCI_ECP_CAP_ID_SUPP) {
+			cap.supported_protocol.reg0 = header.val;
+			cap.supported_protocol.reg1 = read32(ext_cap_ptr + 1);
+			cap.supported_protocol.reg2 = read32(ext_cap_ptr + 2);
+		}
+
+		callback(context, &cap);
+
+		if (!header.next_ptr)
+			break;
+
+		ext_cap_ptr += header.next_ptr;
+	}
+
+	return CB_SUCCESS;
+}
+
+struct supported_usb_cap_context {
+	void *context;
+	void (*callback)(void *context, const struct xhci_supported_protocol *data);
+};
+
+static void xhci_supported_usb_cap_handler(void *context, const struct xhci_ext_cap *cap)
+{
+	const struct xhci_supported_protocol *data;
+	struct supported_usb_cap_context *internal_context = context;
+
+	if (cap->cap_id != XHCI_ECP_CAP_ID_SUPP)
+		return;
+
+	data = &cap->supported_protocol;
+
+	if (memcmp(data->name, "USB ", 4)) {
+		printk(BIOS_DEBUG, "%s: Unknown Protocol: %.*s\n", __func__,
+		       (int)sizeof(data->name), data->name);
+		return;
+	}
+
+	internal_context->callback(internal_context->context, data);
+}
+
+enum cb_err xhci_resource_for_each_supported_usb_cap(
+	const struct resource *res, void *context,
+	void (*callback)(void *context, const struct xhci_supported_protocol *data))
+{
+	struct supported_usb_cap_context internal_context = {
+		.context = context,
+		.callback = callback,
+	};
+
+	return xhci_resource_for_each_ext_cap(res, &internal_context,
+					      xhci_supported_usb_cap_handler);
+}
+
+void xhci_print_supported_protocol(const struct xhci_supported_protocol *supported_protocol)
+{
+	printk(BIOS_DEBUG, "xHCI Supported Protocol:\n");
+	printk(BIOS_DEBUG, "  Major: %#x, Minor: %#x, Protocol: '%.*s'\n",
+	       supported_protocol->major_rev, supported_protocol->minor_rev,
+	       (int)sizeof(supported_protocol->name), supported_protocol->name);
+	printk(BIOS_DEBUG, "  Port Offset: %d, Port Count: %d\n",
+	       supported_protocol->port_offset, supported_protocol->port_count);
+}
diff --git a/src/include/device/xhci.h b/src/include/device/xhci.h
index b9c784ee91..861bf22d42 100644
--- a/src/include/device/xhci.h
+++ b/src/include/device/xhci.h
@@ -97,6 +97,9 @@ struct xhci_usb_info {
 /**
  * Iterates over the xHCI Extended Capabilities List.
  */
+enum cb_err xhci_resource_for_each_ext_cap(const struct resource *res, void *context,
+				  void (*callback)(void *context,
+						   const struct xhci_ext_cap *cap));
 enum cb_err xhci_for_each_ext_cap(const struct device *device, void *context,
 				  void (*callback)(void *context,
 						   const struct xhci_ext_cap *cap));
@@ -108,6 +111,9 @@ enum cb_err xhci_for_each_ext_cap(const struct device *device, void *context,
 enum cb_err xhci_for_each_supported_usb_cap(
 	const struct device *device, void *context,
 	void (*callback)(void *context, const struct xhci_supported_protocol *data));
+enum cb_err xhci_resource_for_each_supported_usb_cap(
+	const struct resource *res, void *context,
+	void (*callback)(void *context, const struct xhci_supported_protocol *data));
 
 void xhci_print_supported_protocol(const struct xhci_supported_protocol *supported_protocol);