sc7280: Add SHRM firmware support

SHRM is a system hardware resource manager. It is used to manage run time
DDRSS activities. DDRSS stands for DDR subsystem.

BUG=b:182963902
TEST=Validated on qualcomm sc7280 development board
by trying DDR clocks which through SHRM RSI command.

Change-Id: I44484573a829eaefbd34907c6fe78d427506a762
Signed-off-by: Ravi Kumar Bokka <rbokka@codeaurora.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49392
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Shelley Chen <shchen@google.com>

src/mainboard/google/herobrine/romstage.c

@@ -3,9 +3,11 @@
 #include <arch/stages.h>
 #include <soc/qclib_common.h>
 #include "board.h"
+#include <soc/shrm.h>
 
 void platform_romstage_main(void)
 {
+	shrm_fw_load_reset();
 	/* QCLib: DDR init & train */
 	qclib_load_and_run();
 

src/soc/qualcomm/common/include/soc/symbols_common.h

@@ -23,5 +23,6 @@ DECLARE_REGION(dram_modem_wifi_only)
 DECLARE_REGION(dram_modem_extra)
 DECLARE_REGION(dram_wlan)
 DECLARE_REGION(dram_wpss)
+DECLARE_REGION(shrm)
 
 #endif // _SOC_QUALCOMM_SYMBOLS_COMMON_H_

src/soc/qualcomm/sc7280/Makefile.inc

@@ -26,6 +26,7 @@ verstage-$(CONFIG_DRIVERS_UART) += ../common/qupv3_uart.c
 
 ################################################################################
 romstage-y += cbmem.c
+romstage-y += shrm_load_reset.c
 romstage-y += ../common/qclib.c
 romstage-y += ../common/mmu.c
 romstage-y += mmu.c
@@ -101,4 +102,12 @@ $(I2C_FW_CBFS)-type := raw
 $(I2C_FW_CBFS)-compression := $(CBFS_PRERAM_COMPRESS_FLAG)
 cbfs-files-y += $(I2C_FW_CBFS)
 
+################################################################################
+SHRM_FILE := $(SC7280_BLOB)/shrm/shrm.elf
+SHRM_CBFS := $(CONFIG_CBFS_PREFIX)/shrm
+$(SHRM_CBFS)-file := $(SHRM_FILE)
+$(SHRM_CBFS)-type := payload
+$(SHRM_CBFS)-compression := none
+cbfs-files-y += $(SHRM_CBFS)
+
 endif

src/soc/qualcomm/sc7280/include/soc/shrm.h

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _SOC_QUALCOMM_SC7280_SHRM_H__
+#define _SOC_QUALCOMM_SC7280_SHRM_H__
+
+void shrm_fw_load_reset(void);
+
+#endif  // _SOC_QUALCOMM_SC7280_SHRM_H__

src/soc/qualcomm/sc7280/memlayout.ld

@@ -17,6 +17,8 @@
 
 SECTIONS
 {
+	REGION(shrm, 0x09060000, 64K , 4K)
+
 	AOPSRAM_START(0x0B000000)
 	REGION(aop, 0x0B000000, 0x100000, 4096)
 	AOPSRAM_END(0x0B100000)

src/soc/qualcomm/sc7280/shrm_load_reset.c

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <cbfs.h>
+#include <console/console.h>
+#include <soc/mmu.h>
+#include <soc/shrm.h>
+#include <soc/clock.h>
+
+void shrm_fw_load_reset(void)
+{
+	bool shrm_fw_entry;
+	struct prog shrm_fw_prog =
+		PROG_INIT(PROG_PAYLOAD, CONFIG_CBFS_PREFIX "/shrm");
+
+	shrm_fw_entry = selfload(&shrm_fw_prog);
+	if (!shrm_fw_entry)
+		die("SOC image: SHRM load failed");
+
+	clock_reset_shrm();
+
+	printk(BIOS_DEBUG, "\nSOC:SHRM brought out of reset.\n");
+}