mtd/maps/physmap-ixp4xx.c

1 // SPDX-License-Identifier: GPL-2.0
3  * Intel IXP4xx OF physmap add-on
10  * Copyright (C) 2003-2004 MontaVista Software, Inc.
17 #include "physmap-ixp4xx.h"
20  * Read/write a 16 bit word from flash address 'addr'.
22  * When the cpu is in little-endian mode it swizzles the address lines
24  * and the like end up on the correct flash address.
27  * handles 32 bit reads, the byte stream ABCD is stored on the flash as:
29  *     +---+---+
31  *     +---+---+
33  *     +---+---+
36  * data and other flash commands which are always in D7-D0.
73 	val.x[0] = flash_read16(map->virt + ofs);  in ixp4xx_read16()
78  * The IXP4xx expansion bus only allows 16-bit wide acceses
79  * when attached to a 16-bit wide device (such as the 28F128J3A),
86 	void __iomem *src = map->virt + from;  in ixp4xx_copy_from()
92 		*dest++ = BYTE1(flash_read16(src-1));  in ixp4xx_copy_from()
94 		--len;  in ixp4xx_copy_from()
102 		len -= 2;  in ixp4xx_copy_from()
111 	flash_write16(d.x[0], map->virt + adr);  in ixp4xx_write16()
118 	struct device *dev = &pdev->dev;  in of_flash_probe_ixp4xx()
121 	if (!of_device_is_compatible(np, "intel,ixp4xx-flash"))  in of_flash_probe_ixp4xx()
124 	map->read = ixp4xx_read16;  in of_flash_probe_ixp4xx()
125 	map->write = ixp4xx_write16;  in of_flash_probe_ixp4xx()
126 	map->copy_from = ixp4xx_copy_from;  in of_flash_probe_ixp4xx()
127 	map->copy_to = NULL;  in of_flash_probe_ixp4xx()
129 	dev_info(dev, "initialized Intel IXP4xx-specific physmap control\n");  in of_flash_probe_ixp4xx()