ahci-remap.h: add ahci remapping definitions

Signed-off-by: Dan Williams <[e-mail]>
[hch: split into a separate header and commit]
Signed-off-by: Christoph Hellwig <[e-mail]>
[tj: dropped duplicate definition of AHCI_VSCAP spotted by Sergei]
Cc: Sergei Shtylyov <[e-mail]>
Signed-off-by: Tejun Heo <[e-mail]>

include/linux/ahci-remap.h

···
+#ifndef _LINUX_AHCI_REMAP_H
+#define _LINUX_AHCI_REMAP_H
+
+#include <linux/sizes.h>
+
+#define AHCI_VSCAP		0xa4
+#define AHCI_REMAP_CAP		0x800
+
+/* device class code */
+#define AHCI_REMAP_N_DCC	0x880
+
+/* remap-device base relative to ahci-bar */
+#define AHCI_REMAP_N_OFFSET	SZ_16K
+#define AHCI_REMAP_N_SIZE	SZ_16K
+
+#define AHCI_MAX_REMAP		3
+
+static inline unsigned int ahci_remap_dcc(int i)
+{
+	return AHCI_REMAP_N_DCC + i * 0x80;
+}
+
+static inline unsigned int ahci_remap_base(int i)
+{
+	return AHCI_REMAP_N_OFFSET + i * AHCI_REMAP_N_SIZE;
+}
+
+#endif /* _LINUX_AHCI_REMAP_H */