Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / mach-ep93xx / include / mach / uncompress.h

diff --git a/kernel/arch/arm/mach-ep93xx/include/mach/uncompress.h b/kernel/arch/arm/mach-ep93xx/include/mach/uncompress.h
new file mode 100644 (file)
index 0000000..03c42e5
--- /dev/null
+++ b/kernel/arch/arm/mach-ep93xx/include/mach/uncompress.h
@@ -0,0 +1,82 @@
+/*
+ * arch/arm/mach-ep93xx/include/mach/uncompress.h
+ *
+ * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#include <mach/ep93xx-regs.h>
+
+static unsigned char __raw_readb(unsigned int ptr)
+{
+       return *((volatile unsigned char *)ptr);
+}
+
+static unsigned int __raw_readl(unsigned int ptr)
+{
+       return *((volatile unsigned int *)ptr);
+}
+
+static void __raw_writeb(unsigned char value, unsigned int ptr)
+{
+       *((volatile unsigned char *)ptr) = value;
+}
+
+static 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
+ * status and packet data scribbled over the uncompressed kernel image.
+ * Work around this by resetting the ethernet MAC before we uncompress.
+ */
+#define PHYS_ETH_SELF_CTL              0x80010020
+#define ETH_SELF_CTL_RESET             0x00000001
+
+static void ethernet_reset(void)
+{
+       unsigned int v;
+
+       /* Reset the ethernet MAC.  */
+       v = __raw_readl(PHYS_ETH_SELF_CTL);
+       __raw_writel(v | ETH_SELF_CTL_RESET, PHYS_ETH_SELF_CTL);
+
+       /* Wait for reset to finish.  */
+       while (__raw_readl(PHYS_ETH_SELF_CTL) & ETH_SELF_CTL_RESET)
+               ;
+}
+
+
+static void arch_decomp_setup(void)
+{
+       ethernet_reset();
+}