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Diffstat (limited to 'arch/ppc64/kernel/bpa_nvram.c')
-rw-r--r--arch/ppc64/kernel/bpa_nvram.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/bpa_nvram.c b/arch/ppc64/kernel/bpa_nvram.c
new file mode 100644
index 00000000000..06a119cfceb
--- /dev/null
+++ b/arch/ppc64/kernel/bpa_nvram.c
@@ -0,0 +1,118 @@
+/*
+ * NVRAM for CPBW
+ *
+ * (C) Copyright IBM Corp. 2005
+ *
+ * Authors : Utz Bacher <utz.bacher@de.ibm.com>
+ *
+ * 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, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#include <asm/machdep.h>
+#include <asm/nvram.h>
+#include <asm/prom.h>
+
+static void __iomem *bpa_nvram_start;
+static long bpa_nvram_len;
+static spinlock_t bpa_nvram_lock = SPIN_LOCK_UNLOCKED;
+
+static ssize_t bpa_nvram_read(char *buf, size_t count, loff_t *index)
+{
+ unsigned long flags;
+
+ if (*index >= bpa_nvram_len)
+ return 0;
+ if (*index + count > bpa_nvram_len)
+ count = bpa_nvram_len - *index;
+
+ spin_lock_irqsave(&bpa_nvram_lock, flags);
+
+ memcpy_fromio(buf, bpa_nvram_start + *index, count);
+
+ spin_unlock_irqrestore(&bpa_nvram_lock, flags);
+
+ *index += count;
+ return count;
+}
+
+static ssize_t bpa_nvram_write(char *buf, size_t count, loff_t *index)
+{
+ unsigned long flags;
+
+ if (*index >= bpa_nvram_len)
+ return 0;
+ if (*index + count > bpa_nvram_len)
+ count = bpa_nvram_len - *index;
+
+ spin_lock_irqsave(&bpa_nvram_lock, flags);
+
+ memcpy_toio(bpa_nvram_start + *index, buf, count);
+
+ spin_unlock_irqrestore(&bpa_nvram_lock, flags);
+
+ *index += count;
+ return count;
+}
+
+static ssize_t bpa_nvram_get_size(void)
+{
+ return bpa_nvram_len;
+}
+
+int __init bpa_nvram_init(void)
+{
+ struct device_node *nvram_node;
+ unsigned long *buffer;
+ int proplen;
+ unsigned long nvram_addr;
+ int ret;
+
+ ret = -ENODEV;
+ nvram_node = of_find_node_by_type(NULL, "nvram");
+ if (!nvram_node)
+ goto out;
+
+ ret = -EIO;
+ buffer = (unsigned long *)get_property(nvram_node, "reg", &proplen);
+ if (proplen != 2*sizeof(unsigned long))
+ goto out;
+
+ ret = -ENODEV;
+ nvram_addr = buffer[0];
+ bpa_nvram_len = buffer[1];
+ if ( (!bpa_nvram_len) || (!nvram_addr) )
+ goto out;
+
+ bpa_nvram_start = ioremap(nvram_addr, bpa_nvram_len);
+ if (!bpa_nvram_start)
+ goto out;
+
+ printk(KERN_INFO "BPA NVRAM, %luk mapped to %p\n",
+ bpa_nvram_len >> 10, bpa_nvram_start);
+
+ ppc_md.nvram_read = bpa_nvram_read;
+ ppc_md.nvram_write = bpa_nvram_write;
+ ppc_md.nvram_size = bpa_nvram_get_size;
+
+out:
+ of_node_put(nvram_node);
+ return ret;
+}