Merge tag 'socfpga_updates_for_v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/dinguyen/linux into next/soc

Merge "SoCFPGA updates for v4.2" from Dinh Nguyen:

- Add big endian support
- Add earlyprintk support on UART1 that is used on Arria10
- Remove the need to map uart_io_desc
- Use of_iomap to map the SCU
- Remove socfpga_smp_init_cpus as arm_dt_init_cpu_maps is already doing
  the CPU mapping.

* tag 'socfpga_updates_for_v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/dinguyen/linux:
  ARM: socfpga: use of_iomap to map the SCU
  ARM: socfpga: remove the need to map uart_io_desc
  ARM: socfpga: Add support for UART1 debug uart for earlyprintk
  ARM: socfpga: support big endian for socfpga
  ARM: socfpga: enable big endian for secondary core(s)
  ARM: debug: fix big endian operation for 8250 word mode

arch/arm/Kconfig.debug

@@ -908,13 +908,22 @@ choice
 		  on SA-11x0 UART ports. The kernel will check for the first
 		  enabled UART in a sequence 3-1-2.
 
-	config DEBUG_SOCFPGA_UART
+	config DEBUG_SOCFPGA_UART0
 		depends on ARCH_SOCFPGA
-		bool "Use SOCFPGA UART for low-level debug"
+		bool "Use SOCFPGA UART0 for low-level debug"
 		select DEBUG_UART_8250
 		help
 		  Say Y here if you want kernel low-level debugging support
-		  on SOCFPGA based platforms.
+		  on SOCFPGA(Cyclone 5 and Arria 5) based platforms.
+
+	config DEBUG_SOCFPGA_UART1
+		depends on ARCH_SOCFPGA
+		bool "Use SOCFPGA UART1 for low-level debug"
+		select DEBUG_UART_8250
+		help
+		  Say Y here if you want kernel low-level debugging support
+		  on SOCFPGA(Arria 10) based platforms.
+
 
 	config DEBUG_SUN9I_UART0
 		bool "Kernel low-level debugging messages via sun9i UART0"
@@ -1407,7 +1416,8 @@ config DEBUG_UART_PHYS
 	default 0xfd883000 if DEBUG_ALPINE_UART0
 	default 0xfe800000 if ARCH_IOP32X
 	default 0xff690000 if DEBUG_RK32_UART2
-	default 0xffc02000 if DEBUG_SOCFPGA_UART
+	default 0xffc02000 if DEBUG_SOCFPGA_UART0
+	default 0xffc02100 if DEBUG_SOCFPGA_UART1
 	default 0xffd82340 if ARCH_IOP13XX
 	default 0xffe40000 if DEBUG_RCAR_GEN1_SCIF0
 	default 0xffe42000 if DEBUG_RCAR_GEN1_SCIF2
@@ -1485,7 +1495,8 @@ config DEBUG_UART_VIRT
 	default 0xfeb26000 if DEBUG_RK3X_UART1
 	default 0xfeb30c00 if DEBUG_KEYSTONE_UART0
 	default 0xfeb31000 if DEBUG_KEYSTONE_UART1
-	default 0xfec02000 if DEBUG_SOCFPGA_UART
+	default 0xfec02000 if DEBUG_SOCFPGA_UART0
+	default 0xfec02100 if DEBUG_SOCFPGA_UART1
 	default 0xfec12000 if DEBUG_MVEBU_UART0 || DEBUG_MVEBU_UART0_ALTERNATE
 	default 0xfec12100 if DEBUG_MVEBU_UART1_ALTERNATE
 	default 0xfec10000 if DEBUG_SIRFATLAS7_UART0
@@ -1530,8 +1541,9 @@ config DEBUG_UART_8250_WORD
 	bool "Use 32-bit accesses for 8250 UART"
 	depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
 	depends on DEBUG_UART_8250_SHIFT >= 2
-	default y if DEBUG_PICOXCELL_UART || DEBUG_SOCFPGA_UART || \
-		ARCH_KEYSTONE || DEBUG_ALPINE_UART0 || \
+	default y if DEBUG_PICOXCELL_UART || DEBUG_SOCFPGA_UART0 || \
+		DEBUG_SOCFPGA_UART1 || ARCH_KEYSTONE || \
+		DEBUG_ALPINE_UART0 || \
 		DEBUG_DAVINCI_DMx_UART0 || DEBUG_DAVINCI_DA8XX_UART1 || \
 		DEBUG_DAVINCI_DA8XX_UART2 || \
 		DEBUG_BCM_KONA_UART || DEBUG_RK32_UART2 || \

arch/arm/include/debug/8250.S

@@ -16,11 +16,14 @@
 
 #ifdef CONFIG_DEBUG_UART_8250_WORD
 		.macro	store, rd, rx:vararg
+	 ARM_BE8(rev \rd, \rd)
 		str	\rd, \rx
+	 ARM_BE8(rev \rd, \rd)
 		.endm
 
 		.macro	load, rd, rx:vararg
 		ldr	\rd, \rx
+	ARM_BE8(rev \rd, \rd)
 		.endm
 #else
 		.macro	store, rd, rx:vararg

arch/arm/mach-socfpga/Kconfig

@@ -1,5 +1,6 @@
 config ARCH_SOCFPGA
 	bool "Altera SOCFPGA family" if ARCH_MULTI_V7
+	select ARCH_SUPPORTS_BIG_ENDIAN
 	select ARM_AMBA
 	select ARM_GIC
 	select CACHE_L2X0

arch/arm/mach-socfpga/core.h

@@ -32,7 +32,6 @@
 #define RSTMGR_MPUMODRST_CPU1		0x2     /* CPU1 Reset */
 
 extern void socfpga_secondary_startup(void);
-extern void __iomem *socfpga_scu_base_addr;
 
 extern void socfpga_init_clocks(void);
 extern void socfpga_sysmgr_init(void);

arch/arm/mach-socfpga/headsmp.S

@@ -10,6 +10,7 @@
 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <asm/memory.h>
+#include <asm/assembler.h>
 
 	.arch	armv7-a
 
@@ -18,12 +19,14 @@ ENTRY(secondary_trampoline)
 	 * Thus, we can just subtract the PAGE_OFFSET to get the physical
 	 * address of &cpu1start_addr. This would not work for platforms
 	 * where the physical memory does not start at 0x0.
-	 */
+	*/
+ARM_BE8(setend	be)
 	adr	r0, 1f
 	ldmia	r0, {r1, r2}
 	sub	r2, r2, #PAGE_OFFSET
 	ldr	r3, [r2]
 	ldr	r4, [r3]
+ARM_BE8(rev	r4, r4)
 	bx	r4
 
 	.align

arch/arm/mach-socfpga/platsmp.c

@@ -54,32 +54,20 @@ static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
 	return 0;
 }
 
-/*
- * Initialise the CPU possible map early - this describes the CPUs
- * which may be present or become present in the system.
- */
-static void __init socfpga_smp_init_cpus(void)
+static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
 {
-	unsigned int i, ncores;
-
-	ncores = scu_get_core_count(socfpga_scu_base_addr);
-
-	for (i = 0; i < ncores; i++)
-		set_cpu_possible(i, true);
+	struct device_node *np;
+	void __iomem *socfpga_scu_base_addr;
 
-	/* sanity check */
-	if (ncores > num_possible_cpus()) {
-		pr_warn("socfpga: no. of cores (%d) greater than configured"
-			"maximum of %d - clipping\n", ncores, num_possible_cpus());
-		ncores = num_possible_cpus();
+	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
+	if (!np) {
+		pr_err("%s: missing scu\n", __func__);
+		return;
 	}
 
-	for (i = 0; i < ncores; i++)
-		set_cpu_possible(i, true);
-}
-
-static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
-{
+	socfpga_scu_base_addr = of_iomap(np, 0);
+	if (!socfpga_scu_base_addr)
+		return;
 	scu_enable(socfpga_scu_base_addr);
 }
 
@@ -96,7 +84,6 @@ static void socfpga_cpu_die(unsigned int cpu)
 }
 
 struct smp_operations socfpga_smp_ops __initdata = {
-	.smp_init_cpus		= socfpga_smp_init_cpus,
 	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
 	.smp_boot_secondary	= socfpga_boot_secondary,
 #ifdef CONFIG_HOTPLUG_CPU

arch/arm/mach-socfpga/socfpga.c

@@ -27,43 +27,10 @@
 
 #include "core.h"
 
-void __iomem *socfpga_scu_base_addr = ((void __iomem *)(SOCFPGA_SCU_VIRT_BASE));
 void __iomem *sys_manager_base_addr;
 void __iomem *rst_manager_base_addr;
 unsigned long socfpga_cpu1start_addr;
 
-static struct map_desc scu_io_desc __initdata = {
-	.virtual	= SOCFPGA_SCU_VIRT_BASE,
-	.pfn		= 0, /* run-time */
-	.length		= SZ_8K,
-	.type		= MT_DEVICE,
-};
-
-static struct map_desc uart_io_desc __initdata = {
-	.virtual	= 0xfec02000,
-	.pfn		= __phys_to_pfn(0xffc02000),
-	.length		= SZ_8K,
-	.type		= MT_DEVICE,
-};
-
-static void __init socfpga_scu_map_io(void)
-{
-	unsigned long base;
-
-	/* Get SCU base */
-	asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
-
-	scu_io_desc.pfn = __phys_to_pfn(base);
-	iotable_init(&scu_io_desc, 1);
-}
-
-static void __init socfpga_map_io(void)
-{
-	socfpga_scu_map_io();
-	iotable_init(&uart_io_desc, 1);
-	early_printk("Early printk initialized\n");
-}
-
 void __init socfpga_sysmgr_init(void)
 {
 	struct device_node *np;
@@ -112,7 +79,6 @@ DT_MACHINE_START(SOCFPGA, "Altera SOCFPGA")
 	.l2c_aux_val	= 0,
 	.l2c_aux_mask	= ~0,
 	.smp		= smp_ops(socfpga_smp_ops),
-	.map_io		= socfpga_map_io,
 	.init_irq	= socfpga_init_irq,
 	.restart	= socfpga_cyclone5_restart,
 	.dt_compat	= altera_dt_match,