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linux-next/arch/arm/mach-omap2/hdq1w.c
Sourav Poddar 8ed43df176 ARM: omap2+: skip device build from platform code for dt
For SOCs with dt enabled, device should be build through device tree.
Prevent device build call from platform code, if device tree is
enabled.

Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2014-05-14 14:41:25 -07:00

100 lines
2.8 KiB
C

/*
* IP block integration code for the HDQ1W/1-wire IP block
*
* Copyright (C) 2012 Texas Instruments, Inc.
* Paul Walmsley
*
* Based on the I2C reset code in arch/arm/mach-omap2/i2c.c by
* Avinash.H.M <avinashhm@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include "soc.h"
#include "omap_hwmod.h"
#include "omap_device.h"
#include "hdq1w.h"
#include "prm.h"
#include "common.h"
/**
* omap_hdq1w_reset - reset the OMAP HDQ1W module
* @oh: struct omap_hwmod *
*
* OCP soft reset the HDQ1W IP block. Section 20.6.1.4 "HDQ1W/1-Wire
* Software Reset" of the OMAP34xx Technical Reference Manual Revision
* ZR (SWPU223R) does not include the rather important fact that, for
* the reset to succeed, the HDQ1W module's internal clock gate must be
* programmed to allow the clock to propagate to the rest of the
* module. In this sense, it's rather similar to the I2C custom reset
* function. Returns 0.
*/
int omap_hdq1w_reset(struct omap_hwmod *oh)
{
u32 v;
int c = 0;
/* Write to the SOFTRESET bit */
omap_hwmod_softreset(oh);
/* Enable the module's internal clocks */
v = omap_hwmod_read(oh, HDQ_CTRL_STATUS_OFFSET);
v |= 1 << HDQ_CTRL_STATUS_CLOCKENABLE_SHIFT;
omap_hwmod_write(v, oh, HDQ_CTRL_STATUS_OFFSET);
/* Poll on RESETDONE bit */
omap_test_timeout((omap_hwmod_read(oh,
oh->class->sysc->syss_offs)
& SYSS_RESETDONE_MASK),
MAX_MODULE_SOFTRESET_WAIT, c);
if (c == MAX_MODULE_SOFTRESET_WAIT)
pr_warning("%s: %s: softreset failed (waited %d usec)\n",
__func__, oh->name, MAX_MODULE_SOFTRESET_WAIT);
else
pr_debug("%s: %s: softreset in %d usec\n", __func__,
oh->name, c);
return 0;
}
#ifndef CONFIG_OF
static int __init omap_init_hdq(void)
{
int id = -1;
struct platform_device *pdev;
struct omap_hwmod *oh;
char *oh_name = "hdq1w";
char *devname = "omap_hdq";
oh = omap_hwmod_lookup(oh_name);
if (!oh)
return 0;
pdev = omap_device_build(devname, id, oh, NULL, 0);
WARN(IS_ERR(pdev), "Can't build omap_device for %s:%s.\n",
devname, oh->name);
return 0;
}
omap_arch_initcall(omap_init_hdq);
#endif