ARM: exynos: enable multiplatform support

This makes it possible to enable the exynos platform as part of a
multiplatform kernel, in addition to keeping the single-platform
exynos support.

The multiplatform variant has a number of limitations at the moment:

* It only supports DT-enabled machines. This is not a problem in
  the long run, as non-DT machines for exynos are going away.
  The main problem here is that the gpio code and the exynos_eint
  irqchip are not multiplatform capable but still required for
  ATAGS based boot.
* The watchdog driver is still missing a conversion.
* sparsemem and memory_holes are currently not supported in
  multiplatform.

The the multiplatform aware ARCH_EXYNOS Kconfig symbol is disabled
for now, as dependent patches are still pending in other
subsystem trees. We will enable it once everything comes together.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

3 files changed, 30 insertions, 6 deletions

diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index d8c251b13ab..1d69c62fe3d 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -7,6 +7,20 @@
 
 # Configuration options for the EXYNOS4
 
+config ARCH_EXYNOS
+	# TODO: make this visible after all drivers are converted
+	bool "Samsung EXYNOS" if ARCH_MULTI_V7 && BROKEN
+	default ARCH_EXYNOS_SINGLE
+	select ARCH_HAS_CPUFREQ
+	select CLKDEV_LOOKUP
+	select CPU_V7
+	select GENERIC_CLOCKEVENTS
+	select HAVE_CLK
+	select HAVE_S3C2410_I2C if I2C
+	select HAVE_S3C_RTC if RTC_CLASS
+	help
+	  Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
+
 if ARCH_EXYNOS
 
 menu "SAMSUNG EXYNOS SoCs Support"
@@ -19,6 +33,9 @@ config ARCH_EXYNOS4
 	help
 	  Samsung EXYNOS4 SoCs based systems
 
+config ARCH_EXYNOS4_SINGLE
+	def_bool ARCH_EXYNOS4 && ARCH_EXYNOS_SINGLE
+
 config ARCH_EXYNOS5
 	bool "SAMSUNG EXYNOS5"
 	select HAVE_SMP
@@ -35,7 +52,7 @@ config CPU_EXYNOS4210
 	select PM_GENERIC_DOMAINS
 	select S5P_PM if PM
 	select S5P_SLEEP if PM
-	select SAMSUNG_DMADEV
+	select SAMSUNG_DMADEV if ARCH_EXYNOS_SINGLE
 	help
 	  Enable EXYNOS4210 CPU support
 
@@ -45,7 +62,7 @@ config SOC_EXYNOS4212
 	depends on ARCH_EXYNOS4
 	select S5P_PM if PM
 	select S5P_SLEEP if PM
-	select SAMSUNG_DMADEV
+	select SAMSUNG_DMADEV if ARCH_EXYNOS_SINGLE
 	help
 	  Enable EXYNOS4212 SoC support
 
@@ -53,7 +70,7 @@ config SOC_EXYNOS4412
 	bool "SAMSUNG EXYNOS4412"
 	default y
 	depends on ARCH_EXYNOS4
-	select SAMSUNG_DMADEV
+	select SAMSUNG_DMADEV if ARCH_EXYNOS_SINGLE
 	help
 	  Enable EXYNOS4412 SoC support
 
@@ -64,7 +81,7 @@ config SOC_EXYNOS5250
 	select S5P_PM if PM
 	select S5P_SLEEP if PM
 	select S5P_DEV_MFC
-	select SAMSUNG_DMADEV
+	select SAMSUNG_DMADEV if ARCH_EXYNOS_SINGLE
 	help
 	  Enable EXYNOS5250 SoC support
 
diff --git a/arch/arm/mach-exynos/Makefile b/arch/arm/mach-exynos/Makefile
index 435757e57bb..57e9124d95e 100644
--- a/arch/arm/mach-exynos/Makefile
+++ b/arch/arm/mach-exynos/Makefile
@@ -4,6 +4,7 @@
 #		http://www.samsung.com/
 #
 # Licensed under GPLv2
+ccflags-$(CONFIG_ARCH_MULTIPLATFORM) += -I$(srctree)/$(src)/include -I$(srctree)/arch/arm/plat-samsung/include
 
 obj-y				:=
 obj-m				:=
@@ -48,12 +49,12 @@ obj-$(CONFIG_MACH_EXYNOS5_DT)		+= mach-exynos5-dt.o
 # device support
 
 obj-y					+= dev-uart.o
-obj-$(CONFIG_ARCH_EXYNOS4)		+= dev-audio.o
+obj-$(CONFIG_ARCH_EXYNOS4_SINGLE)	+= dev-audio.o
 obj-$(CONFIG_EXYNOS4_DEV_AHCI)		+= dev-ahci.o
 obj-$(CONFIG_EXYNOS_DEV_DMA)		+= dma.o
 obj-$(CONFIG_EXYNOS4_DEV_USB_OHCI)	+= dev-ohci.o
 
-obj-$(CONFIG_ARCH_EXYNOS)		+= setup-i2c0.o
+obj-$(CONFIG_ARCH_EXYNOS_SINGLE)	+= setup-i2c0.o
 obj-$(CONFIG_EXYNOS4_SETUP_FIMC)	+= setup-fimc.o
 obj-$(CONFIG_EXYNOS4_SETUP_FIMD0)	+= setup-fimd0.o
 obj-$(CONFIG_EXYNOS4_SETUP_I2C1)	+= setup-i2c1.o
diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index d63d399c7ba..83bd3f0e151 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -368,6 +368,9 @@ static void __init exynos4_map_io(void)
 	else
 		iotable_init(exynos4_iodesc1, ARRAY_SIZE(exynos4_iodesc1));
 
+	if (!IS_ENABLED(CONFIG_EXYNOS_ATAGS))
+		return
+
 	/* initialize device information early */
 	exynos4_default_sdhci0();
 	exynos4_default_sdhci1();
@@ -570,6 +573,8 @@ static void __init exynos4_init_uarts(struct s3c2410_uartcfg *cfg, int no)
 	s3c24xx_init_uartdevs("exynos4210-uart", exynos4_uart_resources, cfg, no);
 }
 
+
+#ifdef CONFIG_EXYNOS_ATAGS
 static void __iomem *exynos_eint_base;
 
 static DEFINE_SPINLOCK(eint_lock);
@@ -875,3 +880,4 @@ static int __init exynos_init_irq_eint(void)
 	return 0;
 }
 arch_initcall(exynos_init_irq_eint);
+#endif