forked from Minki/linux
64b889b39e
Create separate slcr driver instead of polluting common code. Signed-off-by: Michal Simek <michal.simek@xilinx.com>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
|
|
* 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;
|
|
}
|