Fix I/O Macros and mini-app stubs for Nios-II

Patch by Scott McNutt 11, Aug 2005
 -Fix asm/io.h macros
 -Eliminate use of CACHE_BYPASS in cpu code
 -Eliminate assembler warnings
 -Fix mini-app stubs and force no small data

10 files changed, 58 insertions, 43 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 012fa3d..fed7a73 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,13 @@
 Changes since U-Boot 1.1.4:
 ======================================================================
 
+* Fix I/O Macros and mini-app stubs for Nios-II
+  Patch by Scott McNutt 11, Aug 2005
+  -Fix asm/io.h macros
+  -Eliminate use of CACHE_BYPASS in cpu code
+  -Eliminate assembler warnings
+  -Fix mini-app stubs and force no small data
+
 * Add MCF5282 support (without preloader)
   relocate ichache_State to ram
   u-boot can run from internal flash
diff --git a/cpu/nios2/epcs.c b/cpu/nios2/epcs.c
index a8851e9..fd9fd84 100644
--- a/cpu/nios2/epcs.c
+++ b/cpu/nios2/epcs.c
@@ -25,7 +25,7 @@
 
 #if defined(CFG_NIOS_EPCSBASE)
 #include <command.h>
-#include <nios2.h>
+#include <asm/io.h>
 #include <nios2-io.h>
 #include <nios2-epcs.h>
 
@@ -72,8 +72,7 @@
  */
 #define EPCS_TIMEOUT		100	/* 100 msec timeout */
 
-static nios_spi_t *epcs =
-	(nios_spi_t *)CACHE_BYPASS(CFG_NIOS_EPCSBASE);
+static nios_spi_t *epcs = (nios_spi_t *)CFG_NIOS_EPCSBASE;
 
 /***********************************************************************
  * Device access
@@ -81,16 +80,20 @@ static nios_spi_t *epcs =
 static int epcs_cs (int assert)
 {
 	ulong start;
+	unsigned tmp;
+
 
 	if (assert) {
-		epcs->control |= NIOS_SPI_SSO;
+		tmp = readl (&epcs->control);
+		writel (&epcs->control, tmp | NIOS_SPI_SSO);
 	} else {
 		/* Let all bits shift out */
 		start = get_timer (0);
-		while ((epcs->status & NIOS_SPI_TMT) == 0)
+		while ((readl (&epcs->status) & NIOS_SPI_TMT) == 0)
 			if (get_timer (start) > EPCS_TIMEOUT)
 				return (-1);
-		epcs->control &= ~NIOS_SPI_SSO;
+		tmp = readl (&epcs->control);
+		writel (&epcs->control, tmp & ~NIOS_SPI_SSO);
 	}
 	return (0);
 }
@@ -100,10 +103,10 @@ static int epcs_tx (unsigned char c)
 	ulong start;
 
 	start = get_timer (0);
-	while ((epcs->status & NIOS_SPI_TRDY) == 0)
+	while ((readl (&epcs->status) & NIOS_SPI_TRDY) == 0)
 		if (get_timer (start) > EPCS_TIMEOUT)
 			return (-1);
-	epcs->txdata = c;
+	writel (&epcs->txdata, c);
 	return (0);
 }
 
@@ -112,10 +115,10 @@ static int epcs_rx (void)
 	ulong start;
 
 	start = get_timer (0);
-	while ((epcs->status & NIOS_SPI_RRDY) == 0)
+	while ((readl (&epcs->status) & NIOS_SPI_RRDY) == 0)
 		if (get_timer (start) > EPCS_TIMEOUT)
 			return (-1);
-	return (epcs->rxdata);
+	return (readl (&epcs->rxdata));
 }
 
 static unsigned char bitrev[] = {
diff --git a/cpu/nios2/exceptions.S b/cpu/nios2/exceptions.S
index d3b95cf..b9c7a58 100644
--- a/cpu/nios2/exceptions.S
+++ b/cpu/nios2/exceptions.S
@@ -30,6 +30,9 @@
 
 	.global _exception
 
+	.set noat
+	.set nobreak
+
 _exception:
 	/* SAVE ALL REGS -- this allows trap and unimplemented
 	 * instruction handlers to be coded conveniently in C
diff --git a/cpu/nios2/interrupts.c b/cpu/nios2/interrupts.c
index 4a6da58..4685161 100644
--- a/cpu/nios2/interrupts.c
+++ b/cpu/nios2/interrupts.c
@@ -27,6 +27,7 @@
 
 #include <nios2.h>
 #include <nios2-io.h>
+#include <asm/io.h>
 #include <asm/ptrace.h>
 #include <common.h>
 #include <command.h>
@@ -79,7 +80,7 @@ void tmr_isr (void *arg)
 	/* Interrupt is cleared by writing anything to the
 	 * status register.
 	 */
-	tmr->status = 0;
+	writel (&tmr->status, 0);
 	timestamp += CFG_NIOS_TMRMS;
 #ifdef CONFIG_STATUS_LED
 	status_led_tick(timestamp);
@@ -88,16 +89,17 @@ void tmr_isr (void *arg)
 
 static void tmr_init (void)
 {
-	nios_timer_t *tmr =(nios_timer_t *)CACHE_BYPASS(CFG_NIOS_TMRBASE);
+	nios_timer_t *tmr =(nios_timer_t *)CFG_NIOS_TMRBASE;
+
+	writel (&tmr->status, 0);
+	writel (&tmr->control, 0);
+	writel (&tmr->control, NIOS_TIMER_STOP);
 
-	tmr->control &= ~(NIOS_TIMER_START | NIOS_TIMER_ITO);
-	tmr->control |= NIOS_TIMER_STOP;
 #if defined(CFG_NIOS_TMRCNT)
-	tmr->periodl = CFG_NIOS_TMRCNT & 0xffff;
-	tmr->periodh = (CFG_NIOS_TMRCNT >> 16) & 0xffff;
+	writel (&tmr->periodl, CFG_NIOS_TMRCNT & 0xffff);
+	writel (&tmr->periodh, (CFG_NIOS_TMRCNT >> 16) & 0xffff);
 #endif
-	tmr->control |= ( NIOS_TIMER_ITO |
-			  NIOS_TIMER_CONT |
+	writel (&tmr->control, NIOS_TIMER_ITO | NIOS_TIMER_CONT |
 			  NIOS_TIMER_START );
 	irq_install_handler (CFG_NIOS_TMRIRQ, tmr_isr, (void *)tmr);
 }
diff --git a/cpu/nios2/serial.c b/cpu/nios2/serial.c
index 3d76603..0bd3821 100644
--- a/cpu/nios2/serial.c
+++ b/cpu/nios2/serial.c
@@ -24,7 +24,7 @@
 
 #include <common.h>
 #include <watchdog.h>
-#include <nios2.h>
+#include <asm/io.h>
 #include <nios2-io.h>
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -34,8 +34,7 @@ DECLARE_GLOBAL_DATA_PTR;
  *-----------------------------------------------------------------*/
 #if defined(CONFIG_CONSOLE_JTAG)
 
-static nios_jtag_t *jtag =
-	(nios_jtag_t *)CACHE_BYPASS(CFG_NIOS_CONSOLE);
+static nios_jtag_t *jtag = (nios_jtag_t *)CFG_NIOS_CONSOLE;
 
 void serial_setbrg( void ){ return; }
 int serial_init( void ) { return(0);}
@@ -44,9 +43,9 @@ void serial_putc (char c)
 {
 	unsigned val;
 
-	while (NIOS_JTAG_WSPACE (jtag->control) == 0)
+	while (NIOS_JTAG_WSPACE ( readl (&jtag->control)) == 0)
 		WATCHDOG_RESET ();
-	jtag->data = (unsigned char)c;
+	writel (&jtag->data, (unsigned char)c);
 }
 
 void serial_puts (const char *s)
@@ -57,7 +56,7 @@ void serial_puts (const char *s)
 
 int serial_tstc (void)
 {
-	return (jtag->control & NIOS_JTAG_RRDY);
+	return ( readl (&jtag->control) & NIOS_JTAG_RRDY);
 }
 
 int serial_getc (void)
@@ -67,7 +66,7 @@ int serial_getc (void)
 
 	while (1) {
 		WATCHDOG_RESET ();
-		val = jtag->data;
+		val = readl (&jtag->data);
 		if (val & NIOS_JTAG_RVALID)
 			break;
 	}
@@ -80,8 +79,7 @@ int serial_getc (void)
  *-----------------------------------------------------------------*/
 #else
 
-static nios_uart_t *uart = (nios_uart_t *)
-	CACHE_BYPASS(CFG_NIOS_CONSOLE);
+static nios_uart_t *uart = (nios_uart_t *) CFG_NIOS_CONSOLE;
 
 #if defined(CFG_NIOS_FIXEDBAUD)
 
@@ -98,7 +96,7 @@ void serial_setbrg (void)
 	unsigned div;
 
 	div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
-	uart->divisor = div;
+	writel (&uart->divisor,div);
 	return;
 }
 
@@ -118,9 +116,9 @@ void serial_putc (char c)
 {
 	if (c == '\n')
 		serial_putc ('\r');
-	while ((uart->status & NIOS_UART_TRDY) == 0)
+	while ((readl (&uart->status) & NIOS_UART_TRDY) == 0)
 		WATCHDOG_RESET ();
-	uart->txdata = (unsigned char)c;
+	writel (&uart->txdata,(unsigned char)c);
 }
 
 void serial_puts (const char *s)
@@ -132,14 +130,14 @@ void serial_puts (const char *s)
 
 int serial_tstc (void)
 {
-	return (uart->status & NIOS_UART_RRDY);
+	return (readl (&uart->status) & NIOS_UART_RRDY);
 }
 
 int serial_getc (void)
 {
 	while (serial_tstc () == 0)
 		WATCHDOG_RESET ();
-	return( uart->rxdata & 0x00ff );
+	return (readl (&uart->rxdata) & 0x00ff );
 }
 
 #endif /* CONFIG_JTAG_CONSOLE */
diff --git a/cpu/nios2/sysid.c b/cpu/nios2/sysid.c
index 2b7a569..b5a2959 100644
--- a/cpu/nios2/sysid.c
+++ b/cpu/nios2/sysid.c
@@ -26,20 +26,21 @@
 #if defined (CFG_NIOS_SYSID_BASE)
 
 #include <command.h>
-#include <nios2.h>
+#include <asm/io.h>
 #include <nios2-io.h>
 #include <linux/time.h>
 
 void display_sysid (void)
 {
-	struct nios_sysid_t *sysid =
-		(struct nios_sysid_t *)CACHE_BYPASS(CFG_NIOS_SYSID_BASE);
+	struct nios_sysid_t *sysid = (struct nios_sysid_t *)CFG_NIOS_SYSID_BASE;
 	struct tm t;
 	char asc[32];
+	time_t stamp;
 
-	localtime_r ((time_t *)&sysid->timestamp, &t);
+	stamp = readl (&sysid->timestamp);
+	localtime_r (&stamp, &t);
 	asctime_r (&t, asc);
-	printf ("SYSID : %08x, %s", sysid->id, asc);
+	printf ("SYSID : %08x, %s", readl (&sysid->id), asc);
 
 }
 
diff --git a/examples/Makefile b/examples/Makefile
index fee2674..a342d75 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -42,7 +42,7 @@ LOAD_ADDR = 0x00800000 -L $(gcclibdir)/m32 -T nios.lds
 endif
 
 ifeq ($(ARCH),nios2)
-LOAD_ADDR = 0x00800000 -L $(gcclibdir) -T nios2.lds
+LOAD_ADDR = 0x02000000 -L $(gcclibdir) -T nios2.lds
 endif
 
 ifeq ($(ARCH),m68k)
diff --git a/examples/stubs.c b/examples/stubs.c
index 250a9af..1caa575 100644
--- a/examples/stubs.c
+++ b/examples/stubs.c
@@ -92,7 +92,7 @@ gd_t *global_data;
 #x ":\n"				\
 "	movhi	r8, %%hi(%0)\n"		\
 "	ori	r8, r0, %%lo(%0)\n"	\
-"	add	r8, r0, r15\n"		\
+"	add	r8, r8, r15\n"		\
 "	ldw	r8, 0(r8)\n"		\
 "	ldw	r8, %1(r8)\n"		\
 "	jmp	r8\n"			\
diff --git a/include/asm-nios2/io.h b/include/asm-nios2/io.h
index b16a988..0fab53b 100644
--- a/include/asm-nios2/io.h
+++ b/include/asm-nios2/io.h
@@ -39,12 +39,13 @@ extern unsigned inl (unsigned port);
 #define readl(addr)\
 	({unsigned long val;\
 	 asm volatile( "ldwio %0, 0(%1)" :"=r"(val) : "r" (addr)); val;})
+
 #define writeb(addr,val)\
-	asm volatile ("stbio %0, 0(%1)" : : "r" (addr), "r" (val))
+	asm volatile ("stbio %1, 0(%0)" : : "r" (addr), "r" (val))
 #define writew(addr,val)\
-	asm volatile ("sthio %0, 0(%1)" : : "r" (addr), "r" (val))
+	asm volatile ("sthio %1, 0(%0)" : : "r" (addr), "r" (val))
 #define writel(addr,val)\
-	asm volatile ("stwio %0, 0(%1)" : : "r" (addr), "r" (val))
+	asm volatile ("stwio %1, 0(%0)" : : "r" (addr), "r" (val))
 
 #define inb(addr)	readb(addr)
 #define inw(addr)	readw(addr)
diff --git a/nios2_config.mk b/nios2_config.mk
index 03253a3..3f23b56 100644
--- a/nios2_config.mk
+++ b/nios2_config.mk
@@ -23,4 +23,4 @@
 #
 
 PLATFORM_CPPFLAGS += -DCONFIG_NIOS2 -D__NIOS2__
-PLATFORM_CPPFLAGS += -ffixed-r15
+PLATFORM_CPPFLAGS += -ffixed-r15 -G0