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// SPDX-License-Identifier: GPL-2.0
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include "clk.h"
#define CCM_CCDR 0x4
#define CCDR_MMDC_CH0_MASK BIT(17)
#define CCDR_MMDC_CH1_MASK BIT(16)
DEFINE_SPINLOCK(imx_ccm_lock);
EXPORT_SYMBOL_GPL(imx_ccm_lock);
void imx_unregister_clocks(struct clk *clks[], unsigned int count)
{
unsigned int i;
for (i = 0; i < count; i++)
clk_unregister(clks[i]);
}
void imx_unregister_hw_clocks(struct clk_hw *hws[], unsigned int count)
{
unsigned int i;
for (i = 0; i < count; i++)
clk_hw_unregister(hws[i]);
}
EXPORT_SYMBOL_GPL(imx_unregister_hw_clocks);
void imx_mmdc_mask_handshake(void __iomem *ccm_base,
unsigned int chn)
{
unsigned int reg;
reg = readl_relaxed(ccm_base + CCM_CCDR);
reg |= chn == 0 ? CCDR_MMDC_CH0_MASK : CCDR_MMDC_CH1_MASK;
writel_relaxed(reg, ccm_base + CCM_CCDR);
}
void imx_check_clocks(struct clk *clks[], unsigned int count)
{
unsigned i;
for (i = 0; i < count; i++)
if (IS_ERR(clks[i]))
pr_err("i.MX clk %u: register failed with %ld\n",
i, PTR_ERR(clks[i]));
}
void imx_check_clk_hws(struct clk_hw *clks[], unsigned int count)
{
unsigned int i;
for (i = 0; i < count; i++)
if (IS_ERR(clks[i]))
pr_err("i.MX clk %u: register failed with %ld\n",
i, PTR_ERR(clks[i]));
}
EXPORT_SYMBOL_GPL(imx_check_clk_hws);
static struct clk *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 *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;
}
struct clk_hw *imx_obtain_fixed_clock_hw(
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_get_hw(clk);
}
struct clk_hw * imx_obtain_fixed_clk_hw(struct device_node *np,
const char *name)
{
struct clk *clk;
clk = of_clk_get_by_name(np, name);
if (IS_ERR(clk))
return ERR_PTR(-ENOENT);
return __clk_get_hw(clk);
}
EXPORT_SYMBOL_GPL(imx_obtain_fixed_clk_hw);
/*
* 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;
}
#ifndef MODULE
static bool imx_keep_uart_clocks;
static int imx_enabled_uart_clocks;
static struct clk **imx_uart_clocks;
static int __init imx_keep_uart_clocks_param(char *str)
{
imx_keep_uart_clocks = 1;
return 0;
}
__setup_param("earlycon", imx_keep_uart_earlycon,
imx_keep_uart_clocks_param, 0);
__setup_param("earlyprintk", imx_keep_uart_earlyprintk,
imx_keep_uart_clocks_param, 0);
void imx_register_uart_clocks(unsigned int clk_count)
{
imx_enabled_uart_clocks = 0;
/* i.MX boards use device trees now. For build tests without CONFIG_OF, do nothing */
#ifdef CONFIG_OF
if (imx_keep_uart_clocks) {
int i;
imx_uart_clocks = kcalloc(clk_count, sizeof(struct clk *), GFP_KERNEL);
if (!of_stdout)
return;
for (i = 0; i < clk_count; i++) {
imx_uart_clocks[imx_enabled_uart_clocks] = of_clk_get(of_stdout, i);
/* Stop if there are no more of_stdout references */
if (IS_ERR(imx_uart_clocks[imx_enabled_uart_clocks]))
return;
/* Only enable the clock if it's not NULL */
if (imx_uart_clocks[imx_enabled_uart_clocks])
clk_prepare_enable(imx_uart_clocks[imx_enabled_uart_clocks++]);
}
}
#endif
}
static int __init imx_clk_disable_uart(void)
{
if (imx_keep_uart_clocks && imx_enabled_uart_clocks) {
int i;
for (i = 0; i < imx_enabled_uart_clocks; i++) {
clk_disable_unprepare(imx_uart_clocks[i]);
clk_put(imx_uart_clocks[i]);
}
}
kfree(imx_uart_clocks);
return 0;
}
late_initcall_sync(imx_clk_disable_uart);
#endif
MODULE_LICENSE("GPL v2");
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