X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Fasm-arm%2Farch-ixp2000%2Fplatform.h;fp=include%2Fasm-arm%2Farch-ixp2000%2Fplatform.h;h=a66317ab2071f35d8fabce13ce2948cd20ae2985;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=901bba6d02b47bd3d2891b3a39804cbc31182d08;hpb=cee37fe97739d85991964371c1f3a745c00dd236;p=linux-2.6.git

diff --git a/include/asm-arm/arch-ixp2000/platform.h b/include/asm-arm/arch-ixp2000/platform.h
index 901bba6d0..a66317ab2 100644
--- a/include/asm-arm/arch-ixp2000/platform.h
+++ b/include/asm-arm/arch-ixp2000/platform.h
@@ -15,36 +15,40 @@
 
 #ifndef __ASSEMBLY__
 
+static inline unsigned long ixp2000_reg_read(volatile void *reg)
+{
+	return *((volatile unsigned long *)reg);
+}
+
+static inline void ixp2000_reg_write(volatile void *reg, unsigned long val)
+{
+	*((volatile unsigned long *)reg) = val;
+}
+
 /*
- * The IXP2400 B0 silicon contains an erratum (#66) that causes writes
- * to on-chip I/O register to not complete fully. What this means is
- * that if you have a write to on-chip I/O followed by a back-to-back
- * read or write, the first write will happen twice. OR...if it's
- * not a back-to-back transaction, the read or write will generate
- * incorrect data.
- *
- * The official work around for this is to set the on-chip I/O regions
- * as XCB=101 and then force a read-back from the register.
+ * On the IXP2400, we can't use XCB=000 due to chip bugs.  We use
+ * XCB=101 instead, but that makes all I/O accesses bufferable.  This
+ * is not a problem in general, but we do have to be slightly more
+ * careful because I/O writes are no longer automatically flushed out
+ * of the write buffer.
  *
+ * In cases where we want to make sure that a write has been flushed
+ * out of the write buffer before we proceed, for example when masking
+ * a device interrupt before re-enabling IRQs in CPSR, we can use this
+ * function, ixp2000_reg_wrb, which performs a write, a readback, and
+ * issues a dummy instruction dependent on the value of the readback
+ * (mov rX, rX) to make sure that the readback has completed before we
+ * continue.
  */
-#if defined(CONFIG_ARCH_ENP2611) || defined(CONFIG_ARCH_IXDP2400) || defined(CONFIG_ARCH_IXDP2401)
+static inline void ixp2000_reg_wrb(volatile void *reg, unsigned long val)
+{
+	unsigned long dummy;
 
-#include <asm/system.h>		/* Pickup local_irq_ functions */
+	*((volatile unsigned long *)reg) = val;
 
-static inline void ixp2000_reg_write(volatile unsigned long *reg, unsigned long val)
-{
-	volatile unsigned long dummy;
-	unsigned long flags;
-
-	local_irq_save(flags);
-	*reg = val;
-	barrier();
-	dummy = *reg;
-	local_irq_restore(flags);
+	dummy = *((volatile unsigned long *)reg);
+	__asm__ __volatile__("mov %0, %0" : "+r" (dummy));
 }
-#else
-#define	ixp2000_reg_write(reg, val) (*reg = val)
-#endif	/* IXDP2400 || IXDP2401 */
 
 /*
  * Boards may multiplex different devices on the 2nd channel of 
@@ -84,7 +88,7 @@ void ixp2000_release_slowport(struct slowport_cfg *);
  */
 static inline unsigned ixp2000_has_broken_slowport(void)
 {
-	unsigned long id = *IXP2000_PROD_ID;
+	unsigned long id = *IXP2000_PRODUCT_ID;
 	unsigned long id_prod = id & (IXP2000_MAJ_PROD_TYPE_MASK |
 				      IXP2000_MIN_PROD_TYPE_MASK);
 	return (((id_prod ==
@@ -115,6 +119,7 @@ static inline unsigned int ixp2000_is_pcimaster(void)
 }
 
 void ixp2000_map_io(void);
+void ixp2000_uart_init(void);
 void ixp2000_init_irq(void);
 void ixp2000_init_time(unsigned long);
 unsigned long ixp2000_gettimeoffset(void);
@@ -138,30 +143,10 @@ struct ixp2000_flash_data {
 	unsigned long (*bank_setup)(unsigned long);
 };
 
-/*
- * GPIO helper functions
- */
-#define	GPIO_IN		0
-#define	GPIO_OUT	1
-
-extern void gpio_line_config(int line, int style);
-
-static inline int gpio_line_get(int line)
-{
-	return (((*IXP2000_GPIO_PLR) >> line) & 1);
-}
-
-static inline void gpio_line_set(int line, int value)
-{
-	if (value) 
-		ixp2000_reg_write(IXP2000_GPIO_POSR, (1 << line));
-	else 
-		ixp2000_reg_write(IXP2000_GPIO_POCR, (1 << line));
-}
-
 struct ixp2000_i2c_pins {
 	unsigned long sda_pin;
 	unsigned long scl_pin;
 };
 
+
 #endif /*  !__ASSEMBLY__ */