Merge drm/drm-next into drm-intel-next-queued

This is needed to get the fourcc code merged without conflicts.

Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

1 files changed, 126 insertions, 7 deletions

diff --git a/include/linux/nvram.h b/include/linux/nvram.h
index 28bfb9ab94ca..d29d9c93a927 100644
--- a/include/linux/nvram.h
+++ b/include/linux/nvram.h
@@ -2,13 +2,132 @@
 #ifndef _LINUX_NVRAM_H
 #define _LINUX_NVRAM_H
 
+#include <linux/errno.h>
 #include <uapi/linux/nvram.h>
 
-/* __foo is foo without grabbing the rtc_lock - get it yourself */
-extern unsigned char __nvram_read_byte(int i);
-extern unsigned char nvram_read_byte(int i);
-extern void __nvram_write_byte(unsigned char c, int i);
-extern void nvram_write_byte(unsigned char c, int i);
-extern int __nvram_check_checksum(void);
-extern int nvram_check_checksum(void);
+#ifdef CONFIG_PPC
+#include <asm/machdep.h>
+#endif
+
+/**
+ * struct nvram_ops - NVRAM functionality made available to drivers
+ * @read: validate checksum (if any) then load a range of bytes from NVRAM
+ * @write: store a range of bytes to NVRAM then update checksum (if any)
+ * @read_byte: load a single byte from NVRAM
+ * @write_byte: store a single byte to NVRAM
+ * @get_size: return the fixed number of bytes in the NVRAM
+ *
+ * Architectures which provide an nvram ops struct need not implement all
+ * of these methods. If the NVRAM hardware can be accessed only one byte
+ * at a time then it may be sufficient to provide .read_byte and .write_byte.
+ * If the NVRAM has a checksum (and it is to be checked) the .read and
+ * .write methods can be used to implement that efficiently.
+ *
+ * Portable drivers may use the wrapper functions defined here.
+ * The nvram_read() and nvram_write() functions call the .read and .write
+ * methods when available and fall back on the .read_byte and .write_byte
+ * methods otherwise.
+ */
+
+struct nvram_ops {
+	ssize_t         (*get_size)(void);
+	unsigned char   (*read_byte)(int);
+	void            (*write_byte)(unsigned char, int);
+	ssize_t         (*read)(char *, size_t, loff_t *);
+	ssize_t         (*write)(char *, size_t, loff_t *);
+#if defined(CONFIG_X86) || defined(CONFIG_M68K)
+	long            (*initialize)(void);
+	long            (*set_checksum)(void);
+#endif
+};
+
+extern const struct nvram_ops arch_nvram_ops;
+
+static inline ssize_t nvram_get_size(void)
+{
+#ifdef CONFIG_PPC
+	if (ppc_md.nvram_size)
+		return ppc_md.nvram_size();
+#else
+	if (arch_nvram_ops.get_size)
+		return arch_nvram_ops.get_size();
+#endif
+	return -ENODEV;
+}
+
+static inline unsigned char nvram_read_byte(int addr)
+{
+#ifdef CONFIG_PPC
+	if (ppc_md.nvram_read_val)
+		return ppc_md.nvram_read_val(addr);
+#else
+	if (arch_nvram_ops.read_byte)
+		return arch_nvram_ops.read_byte(addr);
+#endif
+	return 0xFF;
+}
+
+static inline void nvram_write_byte(unsigned char val, int addr)
+{
+#ifdef CONFIG_PPC
+	if (ppc_md.nvram_write_val)
+		ppc_md.nvram_write_val(addr, val);
+#else
+	if (arch_nvram_ops.write_byte)
+		arch_nvram_ops.write_byte(val, addr);
+#endif
+}
+
+static inline ssize_t nvram_read_bytes(char *buf, size_t count, loff_t *ppos)
+{
+	ssize_t nvram_size = nvram_get_size();
+	loff_t i;
+	char *p = buf;
+
+	if (nvram_size < 0)
+		return nvram_size;
+	for (i = *ppos; count > 0 && i < nvram_size; ++i, ++p, --count)
+		*p = nvram_read_byte(i);
+	*ppos = i;
+	return p - buf;
+}
+
+static inline ssize_t nvram_write_bytes(char *buf, size_t count, loff_t *ppos)
+{
+	ssize_t nvram_size = nvram_get_size();
+	loff_t i;
+	char *p = buf;
+
+	if (nvram_size < 0)
+		return nvram_size;
+	for (i = *ppos; count > 0 && i < nvram_size; ++i, ++p, --count)
+		nvram_write_byte(*p, i);
+	*ppos = i;
+	return p - buf;
+}
+
+static inline ssize_t nvram_read(char *buf, size_t count, loff_t *ppos)
+{
+#ifdef CONFIG_PPC
+	if (ppc_md.nvram_read)
+		return ppc_md.nvram_read(buf, count, ppos);
+#else
+	if (arch_nvram_ops.read)
+		return arch_nvram_ops.read(buf, count, ppos);
+#endif
+	return nvram_read_bytes(buf, count, ppos);
+}
+
+static inline ssize_t nvram_write(char *buf, size_t count, loff_t *ppos)
+{
+#ifdef CONFIG_PPC
+	if (ppc_md.nvram_write)
+		return ppc_md.nvram_write(buf, count, ppos);
+#else
+	if (arch_nvram_ops.write)
+		return arch_nvram_ops.write(buf, count, ppos);
+#endif
+	return nvram_write_bytes(buf, count, ppos);
+}
+
 #endif  /* _LINUX_NVRAM_H */