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arm: zynq: Move slcr initialization to separate file

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Create separate slcr driver instead of polluting common code.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2013-03-27 12:37:53 +01:00
parent 732078c369
commit 64b889b39e
4 changed files with 74 additions and 10 deletions
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2
arch/arm/mach-zynq/Makefile
View File

@ -3,4 +3,4 @@
#
# Common support
obj-y := common.o
obj-y := common.o slcr.o

10
arch/arm/mach-zynq/common.c
View File

@ -61,15 +61,7 @@ static void __init xilinx_init_machine(void)
static void __init xilinx_zynq_timer_init(void)
{
struct device_node *np;
void __iomem *slcr;
np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-slcr");
slcr = of_iomap(np, 0);
WARN_ON(!slcr);
xilinx_zynq_clocks_init(slcr);
zynq_slcr_init();
clocksource_of_init();
}

3
arch/arm/mach-zynq/common.h
View File

@ -17,6 +17,9 @@
#ifndef __MACH_ZYNQ_COMMON_H__
#define __MACH_ZYNQ_COMMON_H__
extern int zynq_slcr_init(void);
extern void __iomem *zynq_slcr_base;
extern void __iomem *zynq_scu_base;
#endif

69
arch/arm/mach-zynq/slcr.c Normal file
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@ -0,0 +1,69 @@
/*
* Xilinx SLCR driver
*
* Copyright (c) 2011-2013 Xilinx Inc.
*
* 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.
*
* 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., 675 Mass Ave, Cambridge, MA
* 02139, USA.
*/
#include <linux/export.h>
#include <linux/io.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/clk/zynq.h>
#include "common.h"
#define SLCR_UNLOCK_MAGIC 0xDF0D
#define SLCR_UNLOCK 0x8 /* SCLR unlock register */
void __iomem *zynq_slcr_base;
/**
* zynq_slcr_init
* Returns 0 on success, negative errno otherwise.
*
* Called early during boot from platform code to remap SLCR area.
*/
int __init zynq_slcr_init(void)
{
struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-slcr");
if (!np) {
pr_err("%s: no slcr node found\n", __func__);
BUG();
}
zynq_slcr_base = of_iomap(np, 0);
if (!zynq_slcr_base) {
pr_err("%s: Unable to map I/O memory\n", __func__);
BUG();
}
/* unlock the SLCR so that registers can be changed */
writel(SLCR_UNLOCK_MAGIC, zynq_slcr_base + SLCR_UNLOCK);
pr_info("%s mapped to %p\n", np->name, zynq_slcr_base);
xilinx_zynq_clocks_init(zynq_slcr_base);
of_node_put(np);
return 0;
}