sparc: Update LEON serial drivers to use readl/writel macros

Update the LEON2/3 serial driver to make use of the readl and writel
macros as well as the WATCHDOG_RESET() macro.

Add readl/writel and friends to the asm/io.h file.

Introduce the gd->arch.uart variable to store register address.

Lastly, remove baudrate scaler macro variables from board config. It
is now calculated in the serial driver using the global data variable.

Signed-off-by: Francois Retief <fgretief@spaceteq.co.za>

2 files changed, 39 insertions, 26 deletions

diff --git a/arch/sparc/include/asm/global_data.h b/arch/sparc/include/asm/global_data.h
index 667e7d6..0680a56 100644
--- a/arch/sparc/include/asm/global_data.h
+++ b/arch/sparc/include/asm/global_data.h
@@ -15,6 +15,7 @@
 
 /* Architecture-specific global data */
 struct arch_global_data {
+	void *uart;
 };
 
 #include <asm-generic/global_data.h>
diff --git a/arch/sparc/include/asm/io.h b/arch/sparc/include/asm/io.h
index f7b89c8..a317d13 100644
--- a/arch/sparc/include/asm/io.h
+++ b/arch/sparc/include/asm/io.h
@@ -1,7 +1,7 @@
 /* SPARC I/O definitions
  *
- * (C) Copyright 2007
- * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
+ * (C) Copyright 2007, 2015
+ * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
@@ -12,45 +12,57 @@
 /* Nothing to sync, total store ordering (TSO)... */
 #define sync()
 
+/*
+ * Generic virtual read/write.
+ */
+
+#ifndef CONFIG_SYS_HAS_NO_CACHE
+
 /* Forces a cache miss on read/load.
  * On some architectures we need to bypass the cache when reading
  * I/O registers so that we are not reading the same status word
  * over and over again resulting in a hang (until an IRQ if lucky)
- *
  */
-#ifndef CONFIG_SYS_HAS_NO_CACHE
-#define READ_BYTE(var)  SPARC_NOCACHE_READ_BYTE((unsigned int)(var))
-#define READ_HWORD(var) SPARC_NOCACHE_READ_HWORD((unsigned int)(var))
-#define READ_WORD(var)  SPARC_NOCACHE_READ((unsigned int)(var))
-#define READ_DWORD(var) SPARC_NOCACHE_READ_DWORD((unsigned int)(var))
+
+#define __arch_getb(a)		SPARC_NOCACHE_READ_BYTE((unsigned int)(a))
+#define __arch_getw(a)		SPARC_NOCACHE_READ_HWORD((unsigned int)(a))
+#define __arch_getl(a)		SPARC_NOCACHE_READ((unsigned int)(a))
+#define __arch_getq(a)		SPARC_NOCACHE_READ_DWORD((unsigned int)(a))
+
 #else
-#define READ_BYTE(var)  (var)
-#define READ_HWORD(var) (var)
-#define READ_WORD(var)  (var)
-#define READ_DWORD(var) (var)
-#endif
 
-/*
- * Generic virtual read/write.
- */
-#define __arch_getb(a)			(READ_BYTE(a))
-#define __arch_getw(a)			(READ_HWORD(a))
-#define __arch_getl(a)			(READ_WORD(a))
-#define __arch_getq(a)			(READ_DWORD(a))
+#define __arch_getb(a)		(*(volatile unsigned char *)(a))
+#define __arch_getw(a)		(*(volatile unsigned short *)(a))
+#define __arch_getl(a)		(*(volatile unsigned int *)(a))
+#define __arch_getq(a)		(*(volatile unsigned long long *)(a))
+
+#endif /* CONFIG_SYS_HAS_NO_CACHE */
 
-#define __arch_putb(v,a)		(*(volatile unsigned char *)(a) = (v))
-#define __arch_putw(v,a)		(*(volatile unsigned short *)(a) = (v))
-#define __arch_putl(v,a)		(*(volatile unsigned int *)(a) = (v))
+#define __arch_putb(v, a)	(*(volatile unsigned char *)(a) = (v))
+#define __arch_putw(v, a)	(*(volatile unsigned short *)(a) = (v))
+#define __arch_putl(v, a)	(*(volatile unsigned int *)(a) = (v))
+#define __arch_putq(v, a)	(*(volatile unsigned long long *)(a) = (v))
 
-#define __raw_writeb(v,a)		__arch_putb(v,a)
-#define __raw_writew(v,a)		__arch_putw(v,a)
-#define __raw_writel(v,a)		__arch_putl(v,a)
+#define __raw_writeb(v, a)		__arch_putb(v, a)
+#define __raw_writew(v, a)		__arch_putw(v, a)
+#define __raw_writel(v, a)		__arch_putl(v, a)
+#define __raw_writeq(v, a)		__arch_putq(v, a)
 
 #define __raw_readb(a)			__arch_getb(a)
 #define __raw_readw(a)			__arch_getw(a)
 #define __raw_readl(a)			__arch_getl(a)
 #define __raw_readq(a)			__arch_getq(a)
 
+#define writeb				__raw_writeb
+#define writew				__raw_writew
+#define writel				__raw_writel
+#define writeq				__raw_writeq
+
+#define readb				__raw_readb
+#define readw				__raw_readw
+#define readl				__raw_readl
+#define readq				__raw_readq
+
 /*
  * Given a physical address and a length, return a virtual address
  * that can be used to access the memory range with the caching