[ARM] 3620/2: ixp23xx: add uengine loader support

Patch from Lennert Buytenhek

This patch allows the ixp2000 uengine loader that is already in the
tree to also be used on the ixp23xx.
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/common/Makefile

@@ -16,3 +16,4 @@ obj-$(CONFIG_SHARP_PARAM)	+= sharpsl_param.o
 obj-$(CONFIG_SHARPSL_PM)	+= sharpsl_pm.o
 obj-$(CONFIG_SHARP_SCOOP)	+= scoop.o
 obj-$(CONFIG_ARCH_IXP2000)	+= uengine.o
+obj-$(CONFIG_ARCH_IXP23XX)	+= uengine.o

arch/arm/common/uengine.c

@@ -18,10 +18,26 @@
 #include <linux/module.h>
 #include <linux/string.h>
 #include <asm/hardware.h>
-#include <asm/arch/ixp2000-regs.h>
+#include <asm/arch/hardware.h>
 #include <asm/hardware/uengine.h>
 #include <asm/io.h>
 
+#if defined(CONFIG_ARCH_IXP2000)
+#define IXP_UENGINE_CSR_VIRT_BASE	IXP2000_UENGINE_CSR_VIRT_BASE
+#define IXP_PRODUCT_ID			IXP2000_PRODUCT_ID
+#define IXP_MISC_CONTROL		IXP2000_MISC_CONTROL
+#define IXP_RESET1			IXP2000_RESET1
+#else
+#if defined(CONFIG_ARCH_IXP23XX)
+#define IXP_UENGINE_CSR_VIRT_BASE	IXP23XX_UENGINE_CSR_VIRT_BASE
+#define IXP_PRODUCT_ID			IXP23XX_PRODUCT_ID
+#define IXP_MISC_CONTROL		IXP23XX_MISC_CONTROL
+#define IXP_RESET1			IXP23XX_RESET1
+#else
+#error unknown platform
+#endif
+#endif
+
 #define USTORE_ADDRESS			0x000
 #define USTORE_DATA_LOWER		0x004
 #define USTORE_DATA_UPPER		0x008
@@ -43,7 +59,7 @@ u32 ixp2000_uengine_mask;
 
 static void *ixp2000_uengine_csr_area(int uengine)
 {
-	return ((void *)IXP2000_UENGINE_CSR_VIRT_BASE) + (uengine << 10);
+	return ((void *)IXP_UENGINE_CSR_VIRT_BASE) + (uengine << 10);
 }
 
 /*
@@ -91,8 +107,13 @@ EXPORT_SYMBOL(ixp2000_uengine_csr_write);
 
 void ixp2000_uengine_reset(u32 uengine_mask)
 {
-	ixp2000_reg_wrb(IXP2000_RESET1, uengine_mask & ixp2000_uengine_mask);
-	ixp2000_reg_wrb(IXP2000_RESET1, 0);
+	u32 value;
+
+	value = ixp2000_reg_read(IXP_RESET1) & ~ixp2000_uengine_mask;
+
+	uengine_mask &= ixp2000_uengine_mask;
+	ixp2000_reg_wrb(IXP_RESET1, value | uengine_mask);
+	ixp2000_reg_wrb(IXP_RESET1, value);
 }
 EXPORT_SYMBOL(ixp2000_uengine_reset);
 
@@ -235,11 +256,12 @@ static int check_ixp_type(struct ixp2000_uengine_code *c)
 	u32 product_id;
 	u32 rev;
 
-	product_id = ixp2000_reg_read(IXP2000_PRODUCT_ID);
+	product_id = ixp2000_reg_read(IXP_PRODUCT_ID);
 	if (((product_id >> 16) & 0x1f) != 0)
 		return 0;
 
 	switch ((product_id >> 8) & 0xff) {
+#ifdef CONFIG_ARCH_IXP2000
 	case 0:		/* IXP2800 */
 		if (!(c->cpu_model_bitmask & 4))
 			return 0;
@@ -254,6 +276,14 @@ static int check_ixp_type(struct ixp2000_uengine_code *c)
 		if (!(c->cpu_model_bitmask & 2))
 			return 0;
 		break;
+#endif
+
+#ifdef CONFIG_ARCH_IXP23XX
+	case 4:		/* IXP23xx */
+		if (!(c->cpu_model_bitmask & 0x3f0))
+			return 0;
+		break;
+#endif
 
 	default:
 		return 0;
@@ -432,7 +462,8 @@ static int __init ixp2000_uengine_init(void)
 	/*
 	 * Determine number of microengines present.
 	 */
-	switch ((ixp2000_reg_read(IXP2000_PRODUCT_ID) >> 8) & 0x1fff) {
+	switch ((ixp2000_reg_read(IXP_PRODUCT_ID) >> 8) & 0x1fff) {
+#ifdef CONFIG_ARCH_IXP2000
 	case 0:		/* IXP2800 */
 	case 1:		/* IXP2850 */
 		ixp2000_uengine_mask = 0x00ff00ff;
@@ -441,10 +472,17 @@ static int __init ixp2000_uengine_init(void)
 	case 2:		/* IXP2400 */
 		ixp2000_uengine_mask = 0x000f000f;
 		break;
+#endif
+
+#ifdef CONFIG_ARCH_IXP23XX
+	case 4:		/* IXP23xx */
+		ixp2000_uengine_mask = (*IXP23XX_EXP_CFG_FUSE >> 8) & 0xf;
+		break;
+#endif
 
 	default:
 		printk(KERN_INFO "Detected unknown IXP2000 model (%.8x)\n",
-			(unsigned int)ixp2000_reg_read(IXP2000_PRODUCT_ID));
+			(unsigned int)ixp2000_reg_read(IXP_PRODUCT_ID));
 		ixp2000_uengine_mask = 0x00000000;
 		break;
 	}
@@ -457,15 +495,15 @@ static int __init ixp2000_uengine_init(void)
 	/*
 	 * Synchronise timestamp counters across all microengines.
 	 */
-	value = ixp2000_reg_read(IXP2000_MISC_CONTROL);
-	ixp2000_reg_wrb(IXP2000_MISC_CONTROL, value & ~0x80);
+	value = ixp2000_reg_read(IXP_MISC_CONTROL);
+	ixp2000_reg_wrb(IXP_MISC_CONTROL, value & ~0x80);
 	for (uengine = 0; uengine < 32; uengine++) {
 		if (ixp2000_uengine_mask & (1 << uengine)) {
 			ixp2000_uengine_csr_write(uengine, TIMESTAMP_LOW, 0);
 			ixp2000_uengine_csr_write(uengine, TIMESTAMP_HIGH, 0);
 		}
 	}
-	ixp2000_reg_wrb(IXP2000_MISC_CONTROL, value | 0x80);
+	ixp2000_reg_wrb(IXP_MISC_CONTROL, value | 0x80);
 
 	return 0;
 }

arch/arm/mach-ixp23xx/core.c

@@ -439,5 +439,6 @@ static struct platform_device *ixp23xx_devices[] __initdata = {
 
 void __init ixp23xx_sys_init(void)
 {
+	*IXP23XX_EXP_UNIT_FUSE |= 0xf;
 	platform_add_devices(ixp23xx_devices, ARRAY_SIZE(ixp23xx_devices));
 }

include/asm-arm/arch-ixp23xx/ixp23xx.h

@@ -124,6 +124,7 @@
 
 #define IXP23XX_EXP_UNIT_FUSE		IXP23XX_EXP_CFG_REG(0x28)
 #define IXP23XX_EXP_MSF_MUX		IXP23XX_EXP_CFG_REG(0x30)
+#define IXP23XX_EXP_CFG_FUSE		IXP23XX_EXP_CFG_REG(0x34)
 
 #define IXP23XX_EXP_BUS_PHYS		0x90000000
 #define IXP23XX_EXP_BUS_WINDOW_SIZE	0x01000000
@@ -265,6 +266,8 @@
 #define IXP23XX_PCI_UNIT_RESET		(1 << 1)
 #define IXP23XX_XSCALE_RESET		(1 << 0)
 
+#define IXP23XX_UENGINE_CSR_VIRT_BASE	(IXP23XX_CAP_CSR_VIRT + 0x18000)
+
 
 /****************************************************************************
  * PCI CSRs.

include/asm-arm/arch-ixp23xx/platform.h

@@ -14,6 +14,21 @@
 
 #ifndef __ASSEMBLY__
 
+extern inline unsigned long ixp2000_reg_read(volatile void *reg)
+{
+	return *((volatile unsigned long *)reg);
+}
+
+extern inline void ixp2000_reg_write(volatile void *reg, unsigned long val)
+{
+	*((volatile unsigned long *)reg) = val;
+}
+
+extern inline void ixp2000_reg_wrb(volatile void *reg, unsigned long val)
+{
+	*((volatile unsigned long *)reg) = val;
+}
+
 struct pci_sys_data;
 
 void ixp23xx_map_io(void);