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Diffstat (limited to 'kernel/arch/powerpc/platforms/chrp/nvram.c')
-rw-r--r--kernel/arch/powerpc/platforms/chrp/nvram.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/platforms/chrp/nvram.c b/kernel/arch/powerpc/platforms/chrp/nvram.c
new file mode 100644
index 000000000..9ef8cc337
--- /dev/null
+++ b/kernel/arch/powerpc/platforms/chrp/nvram.c
@@ -0,0 +1,91 @@
+/*
+ * c 2001 PPC 64 Team, IBM Corp
+ *
+ * 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.
+ *
+ * /dev/nvram driver for PPC
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <asm/uaccess.h>
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/rtas.h>
+#include "chrp.h"
+
+static unsigned int nvram_size;
+static unsigned char nvram_buf[4];
+static DEFINE_SPINLOCK(nvram_lock);
+
+static unsigned char chrp_nvram_read(int addr)
+{
+ unsigned int done;
+ unsigned long flags;
+ unsigned char ret;
+
+ if (addr >= nvram_size) {
+ printk(KERN_DEBUG "%s: read addr %d > nvram_size %u\n",
+ current->comm, addr, nvram_size);
+ return 0xff;
+ }
+ spin_lock_irqsave(&nvram_lock, flags);
+ if ((rtas_call(rtas_token("nvram-fetch"), 3, 2, &done, addr,
+ __pa(nvram_buf), 1) != 0) || 1 != done)
+ ret = 0xff;
+ else
+ ret = nvram_buf[0];
+ spin_unlock_irqrestore(&nvram_lock, flags);
+
+ return ret;
+}
+
+static void chrp_nvram_write(int addr, unsigned char val)
+{
+ unsigned int done;
+ unsigned long flags;
+
+ if (addr >= nvram_size) {
+ printk(KERN_DEBUG "%s: write addr %d > nvram_size %u\n",
+ current->comm, addr, nvram_size);
+ return;
+ }
+ spin_lock_irqsave(&nvram_lock, flags);
+ nvram_buf[0] = val;
+ if ((rtas_call(rtas_token("nvram-store"), 3, 2, &done, addr,
+ __pa(nvram_buf), 1) != 0) || 1 != done)
+ printk(KERN_DEBUG "rtas IO error storing 0x%02x at %d", val, addr);
+ spin_unlock_irqrestore(&nvram_lock, flags);
+}
+
+void __init chrp_nvram_init(void)
+{
+ struct device_node *nvram;
+ const __be32 *nbytes_p;
+ unsigned int proplen;
+
+ nvram = of_find_node_by_type(NULL, "nvram");
+ if (nvram == NULL)
+ return;
+
+ nbytes_p = of_get_property(nvram, "#bytes", &proplen);
+ if (nbytes_p == NULL || proplen != sizeof(unsigned int)) {
+ of_node_put(nvram);
+ return;
+ }
+
+ nvram_size = be32_to_cpup(nbytes_p);
+
+ printk(KERN_INFO "CHRP nvram contains %u bytes\n", nvram_size);
+ of_node_put(nvram);
+
+ ppc_md.nvram_read_val = chrp_nvram_read;
+ ppc_md.nvram_write_val = chrp_nvram_write;
+
+ return;
+}