mirror of https://gitee.com/openkylin/linux.git
108 lines
4.0 KiB
C
108 lines
4.0 KiB
C
/*
|
|
* Copyright (c) 2001, 2003 Maciej W. Rozycki
|
|
*
|
|
* DEC MS02-NV (54-20948-01) battery backed-up NVRAM module for
|
|
* DECstation/DECsystem 5000/2x0 and DECsystem 5900 and 5900/260
|
|
* systems.
|
|
*
|
|
* 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.
|
|
*
|
|
* $Id: ms02-nv.h,v 1.3 2003/08/19 09:25:36 dwmw2 Exp $
|
|
*/
|
|
|
|
#include <linux/ioport.h>
|
|
#include <linux/mtd/mtd.h>
|
|
|
|
/*
|
|
* Addresses are decoded as follows:
|
|
*
|
|
* 0x000000 - 0x3fffff SRAM
|
|
* 0x400000 - 0x7fffff CSR
|
|
*
|
|
* Within the SRAM area the following ranges are forced by the system
|
|
* firmware:
|
|
*
|
|
* 0x000000 - 0x0003ff diagnostic area, destroyed upon a reboot
|
|
* 0x000400 - ENDofRAM storage area, available to operating systems
|
|
*
|
|
* but we can't really use the available area right from 0x000400 as
|
|
* the first word is used by the firmware as a status flag passed
|
|
* from an operating system. If anything but the valid data magic
|
|
* ID value is found, the firmware considers the SRAM clean, i.e.
|
|
* containing no valid data, and disables the battery resulting in
|
|
* data being erased as soon as power is switched off. So the choice
|
|
* for the start address of the user-available is 0x001000 which is
|
|
* nicely page aligned. The area between 0x000404 and 0x000fff may
|
|
* be used by the driver for own needs.
|
|
*
|
|
* The diagnostic area defines two status words to be read by an
|
|
* operating system, a magic ID to distinguish a MS02-NV board from
|
|
* anything else and a status information providing results of tests
|
|
* as well as the size of SRAM available, which can be 1MiB or 2MiB
|
|
* (that's what the firmware handles; no idea if 2MiB modules ever
|
|
* existed).
|
|
*
|
|
* The firmware only handles the MS02-NV board if installed in the
|
|
* last (15th) slot, so for any other location the status information
|
|
* stored in the SRAM cannot be relied upon. But from the hardware
|
|
* point of view there is no problem using up to 14 such boards in a
|
|
* system -- only the 1st slot needs to be filled with a DRAM module.
|
|
* The MS02-NV board is ECC-protected, like other MS02 memory boards.
|
|
*
|
|
* The state of the battery as provided by the CSR is reflected on
|
|
* the two onboard LEDs. When facing the battery side of the board,
|
|
* with the LEDs at the top left and the battery at the bottom right
|
|
* (i.e. looking from the back side of the system box), their meaning
|
|
* is as follows (the system has to be powered on):
|
|
*
|
|
* left LED battery disable status: lit = enabled
|
|
* right LED battery condition status: lit = OK
|
|
*/
|
|
|
|
/* MS02-NV iomem register offsets. */
|
|
#define MS02NV_CSR 0x400000 /* control & status register */
|
|
|
|
/* MS02-NV CSR status bits. */
|
|
#define MS02NV_CSR_BATT_OK 0x01 /* battery OK */
|
|
#define MS02NV_CSR_BATT_OFF 0x02 /* battery disabled */
|
|
|
|
|
|
/* MS02-NV memory offsets. */
|
|
#define MS02NV_DIAG 0x0003f8 /* diagnostic status */
|
|
#define MS02NV_MAGIC 0x0003fc /* MS02-NV magic ID */
|
|
#define MS02NV_VALID 0x000400 /* valid data magic ID */
|
|
#define MS02NV_RAM 0x001000 /* user-exposed RAM start */
|
|
|
|
/* MS02-NV diagnostic status bits. */
|
|
#define MS02NV_DIAG_TEST 0x01 /* SRAM test done (?) */
|
|
#define MS02NV_DIAG_RO 0x02 /* SRAM r/o test done */
|
|
#define MS02NV_DIAG_RW 0x04 /* SRAM r/w test done */
|
|
#define MS02NV_DIAG_FAIL 0x08 /* SRAM test failed */
|
|
#define MS02NV_DIAG_SIZE_MASK 0xf0 /* SRAM size mask */
|
|
#define MS02NV_DIAG_SIZE_SHIFT 0x10 /* SRAM size shift (left) */
|
|
|
|
/* MS02-NV general constants. */
|
|
#define MS02NV_ID 0x03021966 /* MS02-NV magic ID value */
|
|
#define MS02NV_VALID_ID 0xbd100248 /* valid data magic ID value */
|
|
#define MS02NV_SLOT_SIZE 0x800000 /* size of the address space
|
|
decoded by the module */
|
|
|
|
|
|
typedef volatile u32 ms02nv_uint;
|
|
|
|
struct ms02nv_private {
|
|
struct mtd_info *next;
|
|
struct {
|
|
struct resource *module;
|
|
struct resource *diag_ram;
|
|
struct resource *user_ram;
|
|
struct resource *csr;
|
|
} resource;
|
|
u_char *addr;
|
|
size_t size;
|
|
u_char *uaddr;
|
|
};
|