microblaze: Add support for little-endian Microblaze

Microblaze little-endian toolchain exports __MICROBLAZEEL__
which is used in the kernel to identify little/big endian.

The most of the changes are in loading values from DTB which
is always big endian.

Little endian platforms are based on new AXI bus which has
impact to early uartlite initialization.

Signed-off-by: Michal Simek <monstr@monstr.eu>

10 files changed, 42 insertions, 18 deletions

diff --git a/arch/microblaze/include/asm/byteorder.h b/arch/microblaze/include/asm/byteorder.h
index ce9c58732ff..31902762a42 100644
--- a/arch/microblaze/include/asm/byteorder.h
+++ b/arch/microblaze/include/asm/byteorder.h
@@ -1,6 +1,10 @@
 #ifndef _ASM_MICROBLAZE_BYTEORDER_H
 #define _ASM_MICROBLAZE_BYTEORDER_H
 
+#ifdef __MICROBLAZEEL__
+#include <linux/byteorder/little_endian.h>
+#else
 #include <linux/byteorder/big_endian.h>
+#endif
 
 #endif /* _ASM_MICROBLAZE_BYTEORDER_H */
diff --git a/arch/microblaze/include/asm/checksum.h b/arch/microblaze/include/asm/checksum.h
index 128bf03b54b..0185cbefdda 100644
--- a/arch/microblaze/include/asm/checksum.h
+++ b/arch/microblaze/include/asm/checksum.h
@@ -24,8 +24,13 @@ csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
 		"addc %0, %0, %3\n\t"
 		"addc %0, %0, r0\n\t"
 		: "+&d" (sum)
-		: "d" (saddr), "d" (daddr), "d" (len + proto));
-
+		: "d" (saddr), "d" (daddr),
+#ifdef __MICROBLAZEEL__
+	"d" ((len + proto) << 8)
+#else
+	"d" (len + proto)
+#endif
+);
 	return sum;
 }
 
diff --git a/arch/microblaze/include/asm/cpuinfo.h b/arch/microblaze/include/asm/cpuinfo.h
index 0d4f0ce3ff7..7fab800496a 100644
--- a/arch/microblaze/include/asm/cpuinfo.h
+++ b/arch/microblaze/include/asm/cpuinfo.h
@@ -98,7 +98,8 @@ void set_cpuinfo_pvr_full(struct cpuinfo *ci, struct device_node *cpu);
 static inline unsigned int fcpu(struct device_node *cpu, char *n)
 {
 	int *val;
-	return (val = (int *) of_get_property(cpu, n, NULL)) ? *val : 0;
+	return (val = (int *) of_get_property(cpu, n, NULL)) ?
+							be32_to_cpup(val) : 0;
 }
 
 #endif /* _ASM_MICROBLAZE_CPUINFO_H */
diff --git a/arch/microblaze/include/asm/elf.h b/arch/microblaze/include/asm/elf.h
index 732caf1be74..098dfdde4b0 100644
--- a/arch/microblaze/include/asm/elf.h
+++ b/arch/microblaze/include/asm/elf.h
@@ -71,7 +71,7 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 
 #define ELF_ET_DYN_BASE         (0x08000000)
 
-#ifdef __LITTLE_ENDIAN__
+#ifdef __MICROBLAZEEL__
 #define ELF_DATA	ELFDATA2LSB
 #else
 #define ELF_DATA	ELFDATA2MSB
diff --git a/arch/microblaze/include/asm/unaligned.h b/arch/microblaze/include/asm/unaligned.h
index 3658d91ac0f..2b97cbe500e 100644
--- a/arch/microblaze/include/asm/unaligned.h
+++ b/arch/microblaze/include/asm/unaligned.h
@@ -12,12 +12,18 @@
 
 # ifdef __KERNEL__
 
-# include <linux/unaligned/be_struct.h>
+# include <linux/unaligned/be_byteshift.h>
 # include <linux/unaligned/le_byteshift.h>
 # include <linux/unaligned/generic.h>
 
-# define get_unaligned	__get_unaligned_be
-# define put_unaligned	__put_unaligned_be
+
+#  ifdef __MICROBLAZEEL__
+#   define get_unaligned	__get_unaligned_le
+#   define put_unaligned	__put_unaligned_le
+#  else
+#   define get_unaligned	__get_unaligned_be
+#   define put_unaligned	__put_unaligned_be
+#  endif
 
 # endif	/* __KERNEL__ */
 #endif /* _ASM_MICROBLAZE_UNALIGNED_H */
diff --git a/arch/microblaze/kernel/heartbeat.c b/arch/microblaze/kernel/heartbeat.c
index 5c24eb8219f..154756f3c69 100644
--- a/arch/microblaze/kernel/heartbeat.c
+++ b/arch/microblaze/kernel/heartbeat.c
@@ -59,7 +59,7 @@ void setup_heartbeat(void)
 	}
 
 	if (gpio) {
-		base_addr = *(int *) of_get_property(gpio, "reg", NULL);
+		base_addr = be32_to_cpup(of_get_property(gpio, "reg", NULL));
 		base_addr = (unsigned long) ioremap(base_addr, PAGE_SIZE);
 		printk(KERN_NOTICE "Heartbeat GPIO at 0x%x\n", base_addr);
 
diff --git a/arch/microblaze/kernel/intc.c b/arch/microblaze/kernel/intc.c
index e85bbea1c62..d61ea33aff7 100644
--- a/arch/microblaze/kernel/intc.c
+++ b/arch/microblaze/kernel/intc.c
@@ -138,12 +138,15 @@ void __init init_IRQ(void)
 	}
 	BUG_ON(!intc);
 
-	intc_baseaddr = *(int *) of_get_property(intc, "reg", NULL);
+	intc_baseaddr = be32_to_cpup(of_get_property(intc,
+								"reg", NULL));
 	intc_baseaddr = (unsigned long) ioremap(intc_baseaddr, PAGE_SIZE);
-	nr_irq = *(int *) of_get_property(intc, "xlnx,num-intr-inputs", NULL);
+	nr_irq = be32_to_cpup(of_get_property(intc,
+						"xlnx,num-intr-inputs", NULL));
 
 	intr_type =
-		*(int *) of_get_property(intc, "xlnx,kind-of-intr", NULL);
+		be32_to_cpup(of_get_property(intc,
+						"xlnx,kind-of-intr", NULL));
 	if (intr_type >= (1 << (nr_irq + 1)))
 		printk(KERN_INFO " ERROR: Mismatch in kind-of-intr param\n");
 
diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
index 608e5cf2e10..04d3325039d 100644
--- a/arch/microblaze/kernel/prom.c
+++ b/arch/microblaze/kernel/prom.c
@@ -77,11 +77,12 @@ static int __init early_init_dt_scan_serial(unsigned long node,
 /* find compatible node with uartlite */
 	p = of_get_flat_dt_prop(node, "compatible", &l);
 	if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) &&
-			(strncmp(p, "xlnx,opb-uartlite", 17) != 0))
+			(strncmp(p, "xlnx,opb-uartlite", 17) != 0) &&
+			(strncmp(p, "xlnx,axi-uartlite", 17) != 0))
 		return 0;
 
 	addr = of_get_flat_dt_prop(node, "reg", &l);
-	return *addr; /* return address */
+	return be32_to_cpup(addr); /* return address */
 }
 
 /* this function is looking for early uartlite console - Microblaze specific */
@@ -115,7 +116,7 @@ static int __init early_init_dt_scan_serial_full(unsigned long node,
 
 	addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
 	addr += *(u32 *)of_get_flat_dt_prop(node, "reg-offset", &l);
-	return addr; /* return address */
+	return be32_to_cpu(addr); /* return address */
 }
 
 /* this function is looking for early uartlite console - Microblaze specific */
diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
index 64ca14dbac6..fcb97e86003 100644
--- a/arch/microblaze/kernel/timer.c
+++ b/arch/microblaze/kernel/timer.c
@@ -270,11 +270,11 @@ void __init time_init(void)
 	}
 	BUG_ON(!timer);
 
-	timer_baseaddr = *(int *) of_get_property(timer, "reg", NULL);
+	timer_baseaddr = be32_to_cpup(of_get_property(timer, "reg", NULL));
 	timer_baseaddr = (unsigned long) ioremap(timer_baseaddr, PAGE_SIZE);
-	irq = *(int *) of_get_property(timer, "interrupts", NULL);
-	timer_num =
-		*(int *) of_get_property(timer, "xlnx,one-timer-only", NULL);
+	irq = be32_to_cpup(of_get_property(timer, "interrupts", NULL));
+	timer_num = be32_to_cpup(of_get_property(timer,
+						"xlnx,one-timer-only", NULL));
 	if (timer_num) {
 		eprintk(KERN_EMERG "Please enable two timers in HW\n");
 		BUG();
diff --git a/arch/microblaze/kernel/vmlinux.lds.S b/arch/microblaze/kernel/vmlinux.lds.S
index 20b0552391d..96a88c31fe4 100644
--- a/arch/microblaze/kernel/vmlinux.lds.S
+++ b/arch/microblaze/kernel/vmlinux.lds.S
@@ -15,7 +15,11 @@ ENTRY(microblaze_start)
 #include <asm-generic/vmlinux.lds.h>
 #include <asm/thread_info.h>
 
+#ifdef __MICROBLAZEEL__
+jiffies = jiffies_64;
+#else
 jiffies = jiffies_64 + 4;
+#endif
 
 SECTIONS {
 	. = CONFIG_KERNEL_START;