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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /arch/mips/fw/arc/promlib.c
parentInitial commit. (diff)
downloadlinux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz
linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip
Adding upstream version 5.10.209.upstream/5.10.209
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/mips/fw/arc/promlib.c')
-rw-r--r--arch/mips/fw/arc/promlib.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/arch/mips/fw/arc/promlib.c b/arch/mips/fw/arc/promlib.c
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+++ b/arch/mips/fw/arc/promlib.c
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+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@sgi.com)
+ * Compatibility with board caches, Ulf Carlsson
+ */
+#include <linux/kernel.h>
+#include <asm/sgialib.h>
+#include <asm/bcache.h>
+#include <asm/setup.h>
+
+#if defined(CONFIG_64BIT) && defined(CONFIG_FW_ARC32)
+/*
+ * For 64bit kernels working with a 32bit ARC PROM pointer arguments
+ * for ARC calls need to reside in CKEG0/1. But as soon as the kernel
+ * switches to it's first kernel thread stack is set to an address in
+ * XKPHYS, so anything on stack can't be used anymore. This is solved
+ * by using a * static declartion variables are put into BSS, which is
+ * linked to a CKSEG0 address. Since this is only used on UP platforms
+ * there is not spinlock needed
+ */
+#define O32_STATIC static
+#else
+#define O32_STATIC
+#endif
+
+/*
+ * IP22 boardcache is not compatible with board caches. Thus we disable it
+ * during romvec action. Since r4xx0.c is always compiled and linked with your
+ * kernel, this shouldn't cause any harm regardless what MIPS processor you
+ * have.
+ *
+ * The ARC write and read functions seem to interfere with the serial lines
+ * in some way. You should be careful with them.
+ */
+
+void prom_putchar(char c)
+{
+ O32_STATIC ULONG cnt;
+ O32_STATIC CHAR it;
+
+ it = c;
+
+ bc_disable();
+ ArcWrite(1, &it, 1, &cnt);
+ bc_enable();
+}
+
+char prom_getchar(void)
+{
+ O32_STATIC ULONG cnt;
+ O32_STATIC CHAR c;
+
+ bc_disable();
+ ArcRead(0, &c, 1, &cnt);
+ bc_enable();
+
+ return c;
+}