ARM: ep93xx: multiplatform support

With the clock support and the interrupts out of the way, ep93xx can be
compiled into the same kernel image as the other ARMv4/v5 platforms. The
last obstacle are the two workarounds for broken boot loaders that
require us to re-initialize the ethernet controller and/or the watchdog
on certain machines.

Move this code into the decompressor sources directly, checking for
each possibly affected machine individually.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/Kconfig

@@ -347,22 +347,6 @@ config ARCH_MULTIPLATFORM
 	select SPARSE_IRQ
 	select USE_OF
 
-config ARCH_EP93XX
-	bool "EP93xx-based"
-	select ARCH_SPARSEMEM_ENABLE
-	select ARM_AMBA
-	imply ARM_PATCH_PHYS_VIRT
-	select ARM_VIC
-	select AUTO_ZRELADDR
-	select CLKSRC_MMIO
-	select CPU_ARM920T
-	select GPIOLIB
-	select COMMON_CLK
-	select IRQ_DOMAIN
-	select SPARSE_IRQ
-	help
-	  This enables support for the Cirrus EP93xx series of CPUs.
-
 config ARCH_FOOTBRIDGE
 	bool "FootBridge"
 	select CPU_SA110

arch/arm/boot/compressed/misc-ep93xx.h

@@ -1,54 +1,25 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
- * arch/arm/mach-ep93xx/include/mach/uncompress.h
- *
  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
  */
 
 #include <asm/mach-types.h>
 
-static unsigned char __raw_readb(unsigned int ptr)
-{
-	return *((volatile unsigned char *)ptr);
-}
-
-static unsigned int __raw_readl(unsigned int ptr)
+static inline unsigned int __raw_readl(unsigned int ptr)
 {
 	return *((volatile unsigned int *)ptr);
 }
 
-static void __raw_writeb(unsigned char value, unsigned int ptr)
+static inline void __raw_writeb(unsigned char value, unsigned int ptr)
 {
 	*((volatile unsigned char *)ptr) = value;
 }
 
-static void __raw_writel(unsigned int value, unsigned int ptr)
+static inline void __raw_writel(unsigned int value, unsigned int ptr)
 {
 	*((volatile unsigned int *)ptr) = value;
 }
 
-#define PHYS_UART_DATA		(CONFIG_DEBUG_UART_PHYS + 0x00)
-#define PHYS_UART_FLAG		(CONFIG_DEBUG_UART_PHYS + 0x18)
-#define UART_FLAG_TXFF		0x20
-
-static inline void putc(int c)
-{
-	int i;
-
-	for (i = 0; i < 10000; i++) {
-		/* Transmit fifo not full? */
-		if (!(__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF))
-			break;
-	}
-
-	__raw_writeb(c, PHYS_UART_DATA);
-}
-
-static inline void flush(void)
-{
-}
-
-
 /*
  * Some bootloaders don't turn off DMA from the ethernet MAC before
  * jumping to linux, which means that we might end up with bits of RX
@@ -58,7 +29,7 @@ static inline void flush(void)
 #define PHYS_ETH_SELF_CTL		0x80010020
 #define ETH_SELF_CTL_RESET		0x00000001
 
-static void ethernet_reset(void)
+static inline void ep93xx_ethernet_reset(void)
 {
 	unsigned int v;
 
@@ -75,15 +46,41 @@ static void ethernet_reset(void)
 #define TS72XX_WDT_FEED_PHYS_BASE	0x23c00000
 #define TS72XX_WDT_FEED_VAL		0x05
 
-static void __maybe_unused ts72xx_watchdog_disable(void)
+static inline void __maybe_unused ts72xx_watchdog_disable(void)
 {
 	__raw_writeb(TS72XX_WDT_FEED_VAL, TS72XX_WDT_FEED_PHYS_BASE);
 	__raw_writeb(0, TS72XX_WDT_CONTROL_PHYS_BASE);
 }
 
-static void arch_decomp_setup(void)
+static inline void ep93xx_decomp_setup(void)
 {
 	if (machine_is_ts72xx())
 		ts72xx_watchdog_disable();
-	ethernet_reset();
+
+	if (machine_is_adssphere() ||
+	    machine_is_edb9301() ||
+	    machine_is_edb9302() ||
+	    machine_is_edb9302a() ||
+	    machine_is_edb9302a() ||
+	    machine_is_edb9307() ||
+	    machine_is_edb9307a() ||
+	    machine_is_edb9307a() ||
+	    machine_is_edb9312() ||
+	    machine_is_edb9315() ||
+	    machine_is_edb9315a() ||
+	    machine_is_edb9315a() ||
+	    machine_is_gesbc9312() ||
+	    machine_is_micro9() ||
+	    machine_is_micro9l() ||
+	    machine_is_micro9m() ||
+	    machine_is_micro9s() ||
+	    machine_is_micro9m() ||
+	    machine_is_micro9l() ||
+	    machine_is_micro9s() ||
+	    machine_is_sim_one() ||
+	    machine_is_snapper_cl15() ||
+	    machine_is_ts72xx() ||
+	    machine_is_bk3() ||
+	    machine_is_vision_ep9307())
+		ep93xx_ethernet_reset();
 }

arch/arm/boot/compressed/misc.c

@@ -23,6 +23,7 @@ unsigned int __machine_arch_type;
 #include <linux/types.h>
 #include <linux/linkage.h>
 #include "misc.h"
+#include "misc-ep93xx.h"
 
 static void putstr(const char *ptr);
 
@@ -143,6 +144,9 @@ decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
 	free_mem_end_ptr	= free_mem_ptr_end_p;
 	__machine_arch_type	= arch_id;
 
+#ifdef CONFIG_ARCH_EP93XX
+	ep93xx_decomp_setup();
+#endif
 	arch_decomp_setup();
 
 	putstr("Uncompressing Linux...");

arch/arm/configs/ep93xx_defconfig

@@ -11,6 +11,8 @@ CONFIG_MODULE_UNLOAD=y
 CONFIG_MODULE_FORCE_UNLOAD=y
 # CONFIG_BLK_DEV_BSG is not set
 CONFIG_PARTITION_ADVANCED=y
+CONFIG_ARCH_MULTI_V4T=y
+# CONFIG_ARCH_MULTI_V7 is not set
 CONFIG_ARCH_EP93XX=y
 CONFIG_MACH_ADSSPHERE=y
 CONFIG_MACH_EDB9301=y

arch/arm/mach-ep93xx/Kconfig

@@ -1,4 +1,16 @@
 # SPDX-License-Identifier: GPL-2.0-only
+menuconfig ARCH_EP93XX
+	bool "EP93xx-based"
+	depends on ARCH_MULTI_V4T
+	select ARCH_SPARSEMEM_ENABLE
+	select ARM_AMBA
+	select ARM_VIC
+	select CLKSRC_MMIO
+	select CPU_ARM920T
+	select GPIOLIB
+	help
+	  This enables support for the Cirrus EP93xx series of CPUs.
+
 if ARCH_EP93XX
 
 menu "Cirrus EP93xx Implementation Options"