android_kernel_xiaomi_sm8350/arch/powerpc/platforms/44x/ebony.c
David Gibson 22258fa40e [POWERPC] Enable RTC for Ebony and Walnut (v2)
This patch extends the Ebony and Walnut platform code to instantiate
the existing ds1742 RTC class driver for the DS1743 RTC/NVRAM chip
found on both those boards.  The patch uses a helper function to scan
the device tree and instantiate the appropriate platform_device based
on it, so it should be easy to extend for other boards which have mmio
mapped RTC chips.

Along with this, the device tree binding for the ds1743 chips is
tweaked, based on the existing DS1385 OF binding found at:
	http://playground.sun.com/1275/proposals/Closed/Remanded/Accepted/346-it.txt
Although that document covers the NVRAM portion of the chip, whereas
here we're interested in the RTC portion, so it's not entirely clear
if that's a good model.

This implements only RTC class driver support - that is /dev/rtc0, not
/dev/rtc, and the low-level get/set time callbacks remain
unimplemented.  That means in order to get at the clock you will
either need a modified version of hwclock which will look at
/dev/rtc0, or you'll need to configure udev to symlink rtc0 to rtc.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2008-01-25 07:07:26 -06:00

72 lines
1.7 KiB
C

/*
* Ebony board specific routines
*
* Matt Porter <mporter@kernel.crashing.org>
* Copyright 2002-2005 MontaVista Software Inc.
*
* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
* Copyright (c) 2003-2005 Zultys Technologies
*
* Rewritten and ported to the merged powerpc tree:
* Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
*
* 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.
*/
#include <linux/init.h>
#include <linux/of_platform.h>
#include <linux/rtc.h>
#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/time.h>
#include <asm/uic.h>
#include <asm/pci-bridge.h>
#include "44x.h"
static __initdata struct of_device_id ebony_of_bus[] = {
{ .compatible = "ibm,plb4", },
{ .compatible = "ibm,opb", },
{ .compatible = "ibm,ebc", },
{},
};
static int __init ebony_device_probe(void)
{
of_platform_bus_probe(NULL, ebony_of_bus, NULL);
of_instantiate_rtc();
return 0;
}
machine_device_initcall(ebony, ebony_device_probe);
/*
* Called very early, MMU is off, device-tree isn't unflattened
*/
static int __init ebony_probe(void)
{
unsigned long root = of_get_flat_dt_root();
if (!of_flat_dt_is_compatible(root, "ibm,ebony"))
return 0;
ppc_pci_flags = PPC_PCI_REASSIGN_ALL_RSRC;
return 1;
}
define_machine(ebony) {
.name = "Ebony",
.probe = ebony_probe,
.progress = udbg_progress,
.init_IRQ = uic_init_tree,
.get_irq = uic_get_irq,
.restart = ppc44x_reset_system,
.calibrate_decr = generic_calibrate_decr,
};