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Commit 28f9ec34 authored by Vitaly Wool's avatar Vitaly Wool Committed by Paul Mackerras
Browse files

[POWERPC] Add of_platform support for ROM devices 



This adds support for flash device descriptions to the OF device tree.
It's inspired by and partially borrowed from Sergei's patch "[RFC]
Adding MTD to device tree.patch".

Signed-off-by: default avatarVitaly Wool <vwool@ru.mvista.com>
Signed-off-by: default avatarSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent a5715d6d

Documentation/powerpc/booting-without-of.txt

+39 −0
Original line number Diff line number Diff line
@@ -6,6 +6,8 @@ 
    IBM Corp.

(c) 2005 Becky Bruce <becky.bruce at freescale.com>,

    Freescale Semiconductor, FSL SOC and 32-bit additions

(c) 2006 MontaVista Software, Inc.

    Flash chip node definition



   May 18, 2005: Rev 0.1 - Initial draft, no chapter III yet.
@@ -1693,6 +1695,43 @@ platforms are moved over to use the flattened-device-tree model. 
		};

	};



    g) Flash chip nodes



    Flash chips (Memory Technology Devices) are often used for solid state

    file systems on embedded devices.



    Required properties:



     - device_type : has to be "rom"

     - compatible : Should specify what this ROM device is compatible with

       (i.e. "onenand"). Currently, this is most likely to be "direct-mapped"

       (which corresponds to the MTD physmap mapping driver).

     - regs : Offset and length of the register set (or memory mapping) for

       the device.



    Recommended properties :



     - bank-width : Width of the flash data bus in bytes. Required

       for the NOR flashes (compatible == "direct-mapped" and others) ONLY.

     - partitions : Several pairs of 32-bit values where the first value is

       partition's offset from the start of the device and the second one is

       partition size in bytes with LSB used to signify a read only

       partititon (so, the parition size should always be an even number).

     - partition-names : The list of concatenated zero terminated strings

       representing the partition names.



   Example:



 	flash@ff000000 {

 		device_type = "rom";

 		compatible = "direct-mapped";

 		regs = <ff000000 01000000>;

 		bank-width = <4>;

 		partitions = <00000000 00f80000

 			      00f80000 00080001>;

 		partition-names = "fs\0firmware";

 	};



   More devices will be defined as this spec matures.

arch/powerpc/sysdev/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ obj-$(CONFIG_MMIO_NVRAM) += mmio_nvram.o 
obj-$(CONFIG_FSL_SOC)		+= fsl_soc.o

obj-$(CONFIG_TSI108_BRIDGE)	+= tsi108_pci.o tsi108_dev.o

obj-$(CONFIG_QUICC_ENGINE)	+= qe_lib/

obj-$(CONFIG_MTD)		+= rom.o



ifeq ($(CONFIG_PPC_MERGE),y)

obj-$(CONFIG_PPC_I8259)		+= i8259.o

arch/powerpc/sysdev/rom.c

0 → 100644
+31 −0
Original line number Diff line number Diff line 
/*

 * ROM device registration

 *

 * (C) 2006 MontaVista Software, Inc. This file is licensed under

 * the terms of the GNU General Public License version 2. This program

 * is licensed "as is" without any warranty of any kind, whether express

 * or implied.

 */



#include <linux/kernel.h>

#include <asm/of_device.h>



static int __init powerpc_flash_init(void)

{

	struct device_node *node = NULL;



	/*

	 * Register all the devices which type is "rom"

	 */

	while ((node = of_find_node_by_type(node, "rom")) != NULL) {

		if (node->name == NULL) {

			printk(KERN_WARNING "powerpc_flash_init: found 'rom' "

				"device, but with no name, skipping...\n");

			continue;

		}

		of_platform_device_create(node, node->name, NULL);

	}

	return 0;

}



arch_initcall(powerpc_flash_init);