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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019 DENX Software Engineering
* Lukasz Majewski, DENX Software Engineering, lukma@denx.de
*/
#include <common.h>
#include <asm/io.h>
#include <malloc.h>
#include <clk-uclass.h>
#include <dm/device.h>
#include <dm/uclass.h>
#include <clk.h>
#include "clk.h"
#define UBOOT_DM_CLK_IMX_PLLV3_GENERIC "imx_clk_pllv3_generic"
#define UBOOT_DM_CLK_IMX_PLLV3_USB "imx_clk_pllv3_usb"
#define BM_PLL_POWER (0x1 << 12)
#define BM_PLL_LOCK (0x1 << 31)
struct clk_pllv3 {
struct clk clk;
void __iomem *base;
u32 power_bit;
bool powerup_set;
u32 div_mask;
u32 div_shift;
};
#define to_clk_pllv3(_clk) container_of(_clk, struct clk_pllv3, clk)
static ulong clk_pllv3_generic_get_rate(struct clk *clk)
{
struct clk_pllv3 *pll = to_clk_pllv3(dev_get_clk_ptr(clk->dev));
unsigned long parent_rate = clk_get_parent_rate(clk);
u32 div = (readl(pll->base) >> pll->div_shift) & pll->div_mask;
return (div == 1) ? parent_rate * 22 : parent_rate * 20;
}
static ulong clk_pllv3_generic_set_rate(struct clk *clk, ulong rate)
{
struct clk_pllv3 *pll = to_clk_pllv3(clk);
unsigned long parent_rate = clk_get_parent_rate(clk);
u32 val, div;
if (rate == parent_rate * 22)
div = 1;
else if (rate == parent_rate * 20)
div = 0;
else
return -EINVAL;
val = readl(pll->base);
val &= ~(pll->div_mask << pll->div_shift);
val |= (div << pll->div_shift);
writel(val, pll->base);
/* Wait for PLL to lock */
while (!(readl(pll->base) & BM_PLL_LOCK))
;
return 0;
}
static int clk_pllv3_generic_enable(struct clk *clk)
{
struct clk_pllv3 *pll = to_clk_pllv3(clk);
u32 val;
val = readl(pll->base);
if (pll->powerup_set)
val |= pll->power_bit;
else
val &= ~pll->power_bit;
writel(val, pll->base);
return 0;
}
static int clk_pllv3_generic_disable(struct clk *clk)
{
struct clk_pllv3 *pll = to_clk_pllv3(clk);
u32 val;
val = readl(pll->base);
if (pll->powerup_set)
val &= ~pll->power_bit;
else
val |= pll->power_bit;
writel(val, pll->base);
return 0;
}
static const struct clk_ops clk_pllv3_generic_ops = {
.get_rate = clk_pllv3_generic_get_rate,
.enable = clk_pllv3_generic_enable,
.disable = clk_pllv3_generic_disable,
.set_rate = clk_pllv3_generic_set_rate,
};
struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name,
const char *parent_name, void __iomem *base,
u32 div_mask)
{
struct clk_pllv3 *pll;
struct clk *clk;
char *drv_name;
int ret;
pll = kzalloc(sizeof(*pll), GFP_KERNEL);
if (!pll)
return ERR_PTR(-ENOMEM);
pll->power_bit = BM_PLL_POWER;
switch (type) {
case IMX_PLLV3_GENERIC:
drv_name = UBOOT_DM_CLK_IMX_PLLV3_GENERIC;
pll->div_shift = 0;
pll->powerup_set = false;
break;
case IMX_PLLV3_USB:
drv_name = UBOOT_DM_CLK_IMX_PLLV3_USB;
pll->div_shift = 1;
pll->powerup_set = true;
break;
default:
kfree(pll);
return ERR_PTR(-ENOTSUPP);
}
pll->base = base;
pll->div_mask = div_mask;
clk = &pll->clk;
ret = clk_register(clk, drv_name, name, parent_name);
if (ret) {
kfree(pll);
return ERR_PTR(ret);
}
return clk;
}
U_BOOT_DRIVER(clk_pllv3_generic) = {
.name = UBOOT_DM_CLK_IMX_PLLV3_GENERIC,
.id = UCLASS_CLK,
.ops = &clk_pllv3_generic_ops,
.flags = DM_FLAG_PRE_RELOC,
};
U_BOOT_DRIVER(clk_pllv3_usb) = {
.name = UBOOT_DM_CLK_IMX_PLLV3_USB,
.id = UCLASS_CLK,
.ops = &clk_pllv3_generic_ops,
.flags = DM_FLAG_PRE_RELOC,
};
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