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 ce9c58732ffc..31902762a426 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 128bf03b54b7..0185cbefdda4 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 0d4f0ce3ff7c..7fab800496ae 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 732caf1be741..098dfdde4b06 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 3658d91ac0fb..2b97cbe500e9 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 5c24eb8219f1..154756f3c694 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 e85bbea1c62b..d61ea33aff7c 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 608e5cf2e10a..04d3325039d9 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 64ca14dbac6e..fcb97e86003d 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 20b0552391d1..96a88c31fe48 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;