66 строки
1.5 KiB
C
66 строки
1.5 KiB
C
#include <linux/clk.h>
|
|
#include <linux/err.h>
|
|
#include <linux/of.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include "clk.h"
|
|
|
|
DEFINE_SPINLOCK(imx_ccm_lock);
|
|
|
|
static struct clk * __init imx_obtain_fixed_clock_from_dt(const char *name)
|
|
{
|
|
struct of_phandle_args phandle;
|
|
struct clk *clk = ERR_PTR(-ENODEV);
|
|
char *path;
|
|
|
|
path = kasprintf(GFP_KERNEL, "/clocks/%s", name);
|
|
if (!path)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
phandle.np = of_find_node_by_path(path);
|
|
kfree(path);
|
|
|
|
if (phandle.np) {
|
|
clk = of_clk_get_from_provider(&phandle);
|
|
of_node_put(phandle.np);
|
|
}
|
|
return clk;
|
|
}
|
|
|
|
struct clk * __init imx_obtain_fixed_clock(
|
|
const char *name, unsigned long rate)
|
|
{
|
|
struct clk *clk;
|
|
|
|
clk = imx_obtain_fixed_clock_from_dt(name);
|
|
if (IS_ERR(clk))
|
|
clk = imx_clk_fixed(name, rate);
|
|
return clk;
|
|
}
|
|
|
|
/*
|
|
* This fixups the register CCM_CSCMR1 write value.
|
|
* The write/read/divider values of the aclk_podf field
|
|
* of that register have the relationship described by
|
|
* the following table:
|
|
*
|
|
* write value read value divider
|
|
* 3b'000 3b'110 7
|
|
* 3b'001 3b'111 8
|
|
* 3b'010 3b'100 5
|
|
* 3b'011 3b'101 6
|
|
* 3b'100 3b'010 3
|
|
* 3b'101 3b'011 4
|
|
* 3b'110 3b'000 1
|
|
* 3b'111 3b'001 2(default)
|
|
*
|
|
* That's why we do the xor operation below.
|
|
*/
|
|
#define CSCMR1_FIXUP 0x00600000
|
|
|
|
void imx_cscmr1_fixup(u32 *val)
|
|
{
|
|
*val ^= CSCMR1_FIXUP;
|
|
return;
|
|
}
|