feat(msm8916): add port for MSM8909

The Qualcomm Snapdragon 210 (MSM8909) SoC is very similar to the
existing MSM8916, except for:

  - ARM Cortex-A7 instead of Cortex-A53 (AArch32-only)
  - MMU-500 r2p0 instead of r0p0 (need to clear CACHE_LOCK bit)
  - Different default BL31 address and UART number

Make the existing MSM8916 platform port usable for MSM8909 as well by
adding some minimal if statements where necessary plus the platform
make files for msm8909.

Change-Id: I8eca5bd8f2486cc2174562fb5de28f8dffa0d874
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>

plat/qti/msm8909/platform.mk

@@ -0,0 +1,13 @@
+#
+# Copyright (c) 2022-2023, Stephan Gerhold <stephan@gerhold.net>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+ARM_ARCH_MAJOR	:= 7
+ARM_CORTEX_A7	:= yes
+
+BL31_BASE	?= 0x87e80000
+QTI_UART_NUM	?= 1
+
+include plat/qti/msm8916/platform.mk

plat/qti/msm8909/sp_min/sp_min-msm8909.mk

@@ -0,0 +1,7 @@
+#
+# Copyright (c) 2022-2023, Stephan Gerhold <stephan@gerhold.net>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+include plat/qti/msm8916/sp_min/sp_min-msm8916.mk

plat/qti/msm8916/msm8916_setup.c

@@ -47,7 +47,11 @@ struct uartdm_gpios {
 };
 
 static const struct uartdm_gpios uartdm_gpio_map[] = {
+#if defined(PLAT_msm8909)
+	{4, 5, 0x2}, {20, 21, 0x3},
+#elif defined(PLAT_msm8916)
 	{0, 1, 0x2}, {4, 5, 0x2},
+#endif
 };
 
 /*

plat/qti/msm8916/platform.mk

@@ -17,7 +17,8 @@ PLAT_BL_COMMON_SOURCES	:=	${GICV2_SOURCES}				\
 				plat/qti/msm8916/${ARCH}/msm8916_helpers.S	\
 				plat/qti/msm8916/${ARCH}/uartdm_console.S
 
-MSM8916_PM_SOURCES	:=	lib/cpus/${ARCH}/cortex_a53.S			\
+MSM8916_CPU		:=	$(if ${ARM_CORTEX_A7},cortex_a7,cortex_a53)
+MSM8916_PM_SOURCES	:=	lib/cpus/${ARCH}/${MSM8916_CPU}.S		\
 				plat/common/plat_psci_common.c			\
 				plat/qti/msm8916/msm8916_config.c		\
 				plat/qti/msm8916/msm8916_cpu_boot.c		\
@@ -48,10 +49,11 @@ WARMBOOT_ENABLE_DCACHE_EARLY	:= 1
 ENABLE_SPE_FOR_NS		:= 0
 ENABLE_SVE_FOR_NS		:= 0
 
-# Disable workarounds unnecessary for Cortex-A53
+# Disable workarounds unnecessary for Cortex-A7/A53
 WORKAROUND_CVE_2017_5715	:= 0
 WORKAROUND_CVE_2022_23960	:= 0
 
+ifeq (${MSM8916_CPU},cortex_a53)
 # MSM8916 uses ARM Cortex-A53 r0p0 so likely all the errata apply
 ERRATA_A53_819472		:= 1
 ERRATA_A53_824069		:= 1
@@ -62,6 +64,7 @@ ERRATA_A53_836870		:= 1
 ERRATA_A53_843419		:= 1
 ERRATA_A53_855873		:= 0	# Workaround works only for >= r0p3
 ERRATA_A53_1530924		:= 1
+endif
 
 # Build config flags
 # ------------------