* Patches by David Müller, 31 Jan 2003:LABEL_2003_03_06_2255

  - minimal setup for CardBus bridges
  - add EEPROM read/write support in the CS8900 driver
  - add support for the builtin I2C controller in the Samsung s3c24x0 chips
  - add support for  MPL's VCMA9 (Samsung s3c2410 based) board

* Patch by Steven Scholz, 04 Feb 2003:
  add support for RTC DS1307

* Patch by Reinhard Meyer, 5 Feb 2003:
  fix PLPRCR/SCCR init sequence on 8xx to allow for
  changes of EBDF by software

* Patch by Vladimir Gurevich, 07 Feb 2003:
  "API-compatibility patch" for 4xx I2C driver

3 files changed, 65 insertions, 30 deletions

diff --git a/cpu/mpc8xx/cpu_init.c b/cpu/mpc8xx/cpu_init.c
index abe62094c82..c0ee5de2e9e 100644
--- a/cpu/mpc8xx/cpu_init.c
+++ b/cpu/mpc8xx/cpu_init.c
@@ -68,6 +68,14 @@ void cpu_init_f (volatile immap_t * immr)
 	immr->im_sitk.sitk_piscrk = KAPWR_KEY;
 	immr->im_sit.sit_piscr = CFG_PISCR;
 
+	/* System integration timers. Don't change EBDF! (15-27) */
+
+	immr->im_clkrstk.cark_sccrk = KAPWR_KEY;
+	reg = immr->im_clkrst.car_sccr;
+	reg &= SCCR_MASK;
+	reg |= CFG_SCCR;
+	immr->im_clkrst.car_sccr = reg;
+
 	/* PLL (CPU clock) settings (15-30) */
 
 	immr->im_clkrstk.cark_plprcrk = KAPWR_KEY;
@@ -88,14 +96,6 @@ void cpu_init_f (volatile immap_t * immr)
 #endif
 	immr->im_clkrst.car_plprcr = reg;
 
-	/* System integration timers. Don't change EBDF! (15-27) */
-
-	immr->im_clkrstk.cark_sccrk = KAPWR_KEY;
-	reg = immr->im_clkrst.car_sccr;
-	reg &= SCCR_MASK;
-	reg |= CFG_SCCR;
-	immr->im_clkrst.car_sccr = reg;
-
 	/*
 	 * Memory Controller:
 	 */
diff --git a/cpu/ppc4xx/i2c.c b/cpu/ppc4xx/i2c.c
index 7d8db9bf437..4bf0bbd99cd 100644
--- a/cpu/ppc4xx/i2c.c
+++ b/cpu/ppc4xx/i2c.c
@@ -422,4 +422,23 @@ int i2c_write (uchar chip, uint addr, int alen, uchar * buffer, int len)
         return (i2c_transfer( 0, chip<<1, &xaddr[4-alen], alen, buffer, len ) != 0);
 }
 
+/*-----------------------------------------------------------------------
+ * Read a register
+ */
+uchar i2c_reg_read(uchar i2c_addr, uchar reg)
+{
+	char buf;
+
+	i2c_read(i2c_addr, reg, 1, &buf, 1);
+
+	return(buf);
+}
+
+/*-----------------------------------------------------------------------
+ * Write a register
+ */
+void i2c_reg_write(uchar i2c_addr, uchar reg, uchar val)
+{
+	i2c_write(i2c_addr, reg, 1, &val, 1);
+}
 #endif	/* CONFIG_HARD_I2C */
diff --git a/cpu/xscale/start.S b/cpu/xscale/start.S
index 3d9784ebf4f..95b30e44e97 100644
--- a/cpu/xscale/start.S
+++ b/cpu/xscale/start.S
@@ -4,8 +4,10 @@
  *  Copyright (C) 1998	Dan Malek <dmalek@jlc.net>
  *  Copyright (C) 1999	Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
  *  Copyright (C) 2000	Wolfgang Denk <wd@denx.de>
- *  Copyright (c) 2001	Alex Züpke <azu@sysgo.de>
- *  Copyright (c) 2002	Kyle Harris <kharris@nexus-tech.net>
+ *  Copyright (C) 2001	Alex Züpke <azu@sysgo.de>
+ *  Copyright (C) 2002	Kyle Harris <kharris@nexus-tech.net>
+ *  Copyright (C) 2003  Robert Schwebel <r.schwebel@pengutronix.de>
+ *  Copyright (C) 2003  Kai-Uwe Bloehm <kai-uwe.bloem@auerswald.de>
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -26,8 +28,6 @@
  * MA 02111-1307 USA
  */
 
-
-
 #include <config.h>
 #include <version.h>
 
@@ -136,13 +136,16 @@ reset:
 
 	bl	cpu_init_crit		/* we do sys-critical inits	    */
 
-relocate:				/* relocate U-Boot to RAM	   */
-	adr	r0, _start		/* r0 <- current position of code */
+relocate:				/* relocate U-Boot to RAM	    */
+	adr	r0, _start		/* r0 <- current position of code   */
+	ldr	r1, _TEXT_BASE		/* test if we run from flash or RAM */	
+	cmp     r0, r1                  /* don't reloc during debug         */
+	beq     stack_setup
+
 	ldr	r2, _armboot_start
 	ldr	r3, _armboot_end
-	sub	r2, r3, r2		/* r2 <- size of armboot */
-	ldr	r1, _TEXT_BASE
-	add	r2, r0, r2		/* r2 <- source end address */
+	sub	r2, r3, r2		/* r2 <- size of armboot            */
+	add	r2, r0, r2		/* r2 <- source end address         */
 
 copy_loop:
 	ldmia	r0!, {r3-r10}		/* copy from source address [r0]    */
@@ -151,6 +154,9 @@ copy_loop:
 	ble	copy_loop
 
 	/* Set up the stack						    */
+
+stack_setup:
+
 	ldr	r0, _uboot_reloc	/* upper 128 KiB: relocated uboot   */
 	sub	r0, r0, #CFG_MALLOC_LEN /* malloc area			    */
 					/* FIXME: bdinfo should be here	    */
@@ -183,7 +189,7 @@ _start_armboot: .word start_armboot
 /*									    */
 /****************************************************************************/
 
-	/* Interrupt-Controller base address				    */
+/* Interrupt-Controller base address				            */
 IC_BASE:	   .word	   0x40d00000
 #define ICMR	0x04
 
@@ -191,19 +197,19 @@ IC_BASE:	   .word	   0x40d00000
 RST_BASE:	.word	0x40f00030
 #define RCSR	0x00
 
-	/* Operating System Timer */
+/* Operating System Timer */
 OSTIMER_BASE:	.word	0x40a00000
 #define OSMR3	0x0C
 #define OSCR	0x10
 #define OWER	0x18
 #define OIER	0x1C
 
-	/* Clock Manager Registers					    */
-#ifdef CFG_CPUSPEED
+/* Clock Manager Registers					            */
 CC_BASE:	.word	0x41300000
 #define CCCR	0x00
 cpuspeed:	.word	CFG_CPUSPEED
-#endif
+
+
 	/* RS: ???							    */
 	.macro CPWAIT
 	mrc  p15,0,r0,c2,c0,0
@@ -219,13 +225,16 @@ cpu_init_crit:
 	mov	r1, #0x00
 	str	r1, [r0, #ICMR]
 
-#ifdef CFG_CPUSPEED
+#if defined(CFG_CPUSPEED)
+
 	/* set clock speed */
 	ldr	r0, CC_BASE
 	ldr	r1, cpuspeed
 	str	r1, [r0, #CCCR]
-	mov	r0, #3
+	mov	r0, #2
 	mcr	p14, 0, r0, c6, c0, 0
+
+setspeed_done:
 #endif
 
 	/*
@@ -429,15 +438,21 @@ fiq:
 
 #endif
 
-/************************************************************************/
-/*									*/
-/* Reset function: the PXA250 has no reset function, so we have to	*/
-/* perform a watchdog timeout to cause a reset.				*/
-/*									*/
-/************************************************************************/
+/****************************************************************************/
+/*                                                                          */
+/* Reset function: the PXA250 doesn't have a reset function, so we have to  */
+/* perform a watchdog timeout for a soft reset.                             */
+/*                                                                          */
+/****************************************************************************/
+
 	.align	5
 .globl reset_cpu
+
+	/* FIXME: this code is PXA250 specific. How is this handled on      */
+	/*        other XScale processors?                                  */
+
 reset_cpu:
+
 	/* We set OWE:WME (watchdog enable) and wait until timeout happens  */
 
 	ldr	r0, OSTIMER_BASE
@@ -456,3 +471,4 @@ reset_cpu:
 reset_endless:
 
 	b	reset_endless
+