soc/intel/common: Add the Primary to Sideband bridge library

New platforms have additional Primary to Sideband bridge besides the PCH
P2SB. This change puts the common functions into the P2SB library.

BUG=b:213574324
TEST=Build platforms coreboot images successfully.

Signed-off-by: John Zhao <john.zhao@intel.com>
Change-Id: I63f58584e8c3bfe42cdd81912e1e5140337c2d55
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61283
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Reviewed-by: Wonkyu Kim <wonkyu.kim@intel.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

5 files changed, 126 insertions, 44 deletions

diff --git a/src/soc/intel/common/block/include/intelblocks/p2sb.h b/src/soc/intel/common/block/include/intelblocks/p2sb.h
index 436861c924..b330ccdc54 100644
--- a/src/soc/intel/common/block/include/intelblocks/p2sb.h
+++ b/src/soc/intel/common/block/include/intelblocks/p2sb.h
@@ -43,7 +43,6 @@ void p2sb_set_hpet_bdf(union p2sb_bdf bdf);
 union p2sb_bdf p2sb_get_ioapic_bdf(void);
 void p2sb_set_ioapic_bdf(union p2sb_bdf bdf);
 
-
 /* SOC overrides */
 /*
  * Each SoC should implement EP Mask register to disable SB access
diff --git a/src/soc/intel/common/block/include/intelblocks/p2sblib.h b/src/soc/intel/common/block/include/intelblocks/p2sblib.h
new file mode 100644
index 0000000000..7df528d20d
--- /dev/null
+++ b/src/soc/intel/common/block/include/intelblocks/p2sblib.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SOC_INTEL_COMMON_BLOCK_P2SBLIB_H
+#define SOC_INTEL_COMMON_BLOCK_P2SBLIB_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+/* P2SB generic configuration register */
+#define P2SBC		0xe0
+#define P2SBC_HIDE_BIT	(1 << 0)
+
+bool p2sb_dev_is_hidden(pci_devfn_t dev);
+void p2sb_dev_unhide(pci_devfn_t dev);
+void p2sb_dev_hide(pci_devfn_t dev);
+uint32_t p2sb_dev_sbi_read(pci_devfn_t dev, uint8_t pid, uint16_t reg);
+void p2sb_dev_sbi_write(pci_devfn_t dev, uint8_t pid, uint16_t reg, uint32_t val);
+
+#endif	/* SOC_INTEL_COMMON_BLOCK_P2SBLIB_H */
diff --git a/src/soc/intel/common/block/p2sb/Makefile.inc b/src/soc/intel/common/block/p2sb/Makefile.inc
index d557e36833..5c6378e2a4 100644
--- a/src/soc/intel/common/block/p2sb/Makefile.inc
+++ b/src/soc/intel/common/block/p2sb/Makefile.inc
@@ -1,4 +1,8 @@
-bootblock-$(CONFIG_SOC_INTEL_COMMON_BLOCK_P2SB) += p2sb.c
-romstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_P2SB) += p2sb.c
-ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_P2SB) += p2sb.c
-smm-$(CONFIG_SOC_INTEL_COMMON_BLOCK_P2SB) += p2sb.c
+ifeq ($(CONFIG_SOC_INTEL_COMMON_BLOCK_P2SB),y)
+bootblock-y += p2sb.c
+romstage-y += p2sb.c
+ramstage-y += p2sb.c
+ramstage-y += p2sblib.c
+smm-y += p2sb.c
+smm-y += p2sblib.c
+endif
diff --git a/src/soc/intel/common/block/p2sb/p2sb.c b/src/soc/intel/common/block/p2sb/p2sb.c
index a9384aeb64..16da6911c9 100644
--- a/src/soc/intel/common/block/p2sb/p2sb.c
+++ b/src/soc/intel/common/block/p2sb/p2sb.c
@@ -1,11 +1,14 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#define __SIMPLE_DEVICE__
+
 #include <device/pci_ops.h>
 #include <console/console.h>
 #include <device/device.h>
 #include <device/pci.h>
 #include <device/pci_ids.h>
 #include <intelblocks/p2sb.h>
+#include <intelblocks/p2sblib.h>
 #include <soc/iomap.h>
 #include <soc/p2sb.h>
 #include <soc/pci_devs.h>
@@ -13,20 +16,6 @@
 
 #define PCH_P2SB_EPMASK(mask_number) (PCH_P2SB_EPMASK0 + ((mask_number) * 4))
 
-#define HIDE_BIT (1 << 0)
-
-static bool p2sb_is_hidden(void)
-{
-	const uint16_t pci_vid = pci_read_config16(PCH_DEV_P2SB, PCI_VENDOR_ID);
-
-	if (pci_vid == 0xffff)
-		return true;
-	if (pci_vid == PCI_VENDOR_ID_INTEL)
-		return false;
-	printk(BIOS_ERR, "P2SB PCI_VENDOR_ID is invalid, unknown if hidden\n");
-	return true;
-}
-
 void p2sb_enable_bar(void)
 {
 	/* Enable PCR Base address in PCH */
@@ -56,7 +45,7 @@ void p2sb_configure_hpet(void)
 
 union p2sb_bdf p2sb_get_hpet_bdf(void)
 {
-	const bool was_hidden = p2sb_is_hidden();
+	const bool was_hidden = p2sb_dev_is_hidden(PCH_DEV_P2SB);
 	if (was_hidden)
 		p2sb_unhide();
 
@@ -75,7 +64,7 @@ void p2sb_set_hpet_bdf(union p2sb_bdf bdf)
 
 union p2sb_bdf p2sb_get_ioapic_bdf(void)
 {
-	const bool was_hidden = p2sb_is_hidden();
+	const bool was_hidden = p2sb_dev_is_hidden(PCH_DEV_P2SB);
 	if (was_hidden)
 		p2sb_unhide();
 
@@ -92,35 +81,14 @@ void p2sb_set_ioapic_bdf(union p2sb_bdf bdf)
 	pci_write_config16(PCH_DEV_P2SB, PCH_P2SB_IBDF, bdf.raw);
 }
 
-static void p2sb_set_hide_bit(int hide)
-{
-	const uint16_t reg = PCH_P2SB_E0 + 1;
-	const uint8_t mask = HIDE_BIT;
-	uint8_t val;
-
-	val = pci_read_config8(PCH_DEV_P2SB, reg);
-	val &= ~mask;
-	if (hide)
-		val |= mask;
-	pci_write_config8(PCH_DEV_P2SB, reg, val);
-}
-
 void p2sb_unhide(void)
 {
-	p2sb_set_hide_bit(0);
-
-	if (p2sb_is_hidden())
-		die_with_post_code(POST_HW_INIT_FAILURE,
-				   "Unable to unhide PCH_DEV_P2SB device !\n");
+	p2sb_dev_unhide(PCH_DEV_P2SB);
 }
 
 void p2sb_hide(void)
 {
-	p2sb_set_hide_bit(1);
-
-	if (!p2sb_is_hidden())
-		die_with_post_code(POST_HW_INIT_FAILURE,
-				   "Unable to hide PCH_DEV_P2SB device !\n");
+	p2sb_dev_hide(PCH_DEV_P2SB);
 }
 
 static void p2sb_configure_endpoints(int epmask_id, uint32_t mask)
diff --git a/src/soc/intel/common/block/p2sb/p2sblib.c b/src/soc/intel/common/block/p2sb/p2sblib.c
new file mode 100644
index 0000000000..d00606dd89
--- /dev/null
+++ b/src/soc/intel/common/block/p2sb/p2sblib.c
@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#define __SIMPLE_DEVICE__
+
+#include <console/console.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <intelblocks/p2sb.h>
+#include <intelblocks/p2sblib.h>
+#include <intelblocks/pcr.h>
+#include <soc/pci_devs.h>
+
+bool p2sb_dev_is_hidden(pci_devfn_t dev)
+{
+	const uint16_t pci_vid = pci_read_config16(dev, PCI_VENDOR_ID);
+
+	if (pci_vid == 0xffff)
+		return true;
+	if (pci_vid == PCI_VENDOR_ID_INTEL)
+		return false;
+	printk(BIOS_ERR, "P2SB PCI_VENDOR_ID is invalid, unknown if hidden\n");
+	return true;
+}
+
+static void p2sb_dev_set_hide_bit(pci_devfn_t dev, int hide)
+{
+	const uint16_t reg = P2SBC + 1;
+	const uint8_t mask = P2SBC_HIDE_BIT;
+	uint8_t val;
+
+	val = pci_read_config8(dev, reg);
+	val &= ~mask;
+	if (hide)
+		val |= mask;
+	pci_write_config8(dev, reg, val);
+}
+
+void p2sb_dev_unhide(pci_devfn_t dev)
+{
+	p2sb_dev_set_hide_bit(dev, 0);
+
+	if (p2sb_dev_is_hidden(dev))
+		die_with_post_code(POST_HW_INIT_FAILURE,
+				"Unable to unhide the P2SB device!\n");
+}
+
+void p2sb_dev_hide(pci_devfn_t dev)
+{
+	p2sb_dev_set_hide_bit(dev, 1);
+
+	if (!p2sb_dev_is_hidden(dev))
+		die_with_post_code(POST_HW_INIT_FAILURE,
+				"Unable to hide the P2SB device!\n");
+}
+
+static void p2sb_execute_sideband_access(pci_devfn_t dev, uint8_t cmd, uint8_t pid,
+						uint16_t reg, uint32_t *data)
+{
+	struct pcr_sbi_msg msg = {
+		.pid = pid,
+		.offset = reg,
+		.opcode = cmd,
+		.is_posted = false,
+		.fast_byte_enable = 0xF,
+		.bar = 0,
+		.fid = 0
+	};
+	uint8_t response;
+	int status;
+
+	/* Unhide the P2SB device */
+	p2sb_dev_unhide(dev);
+
+	status = pcr_execute_sideband_msg(dev, &msg, data, &response);
+	if (status || response)
+		printk(BIOS_ERR, "Fail to execute p2sb sideband access\n");
+
+	/* Hide the P2SB device */
+	p2sb_dev_hide(dev);
+}
+
+uint32_t p2sb_dev_sbi_read(pci_devfn_t dev, uint8_t pid, uint16_t reg)
+{
+	uint32_t val = 0;
+	p2sb_execute_sideband_access(dev, PCR_READ, pid, reg, &val);
+	return val;
+}
+
+void p2sb_dev_sbi_write(pci_devfn_t dev, uint8_t pid, uint16_t reg, uint32_t val)
+{
+	p2sb_execute_sideband_access(dev, PCR_WRITE, pid, reg, &val);
+}