150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2017, Intel Corporation
|
|
*/
|
|
#include <linux/slab.h>
|
|
#include <linux/clk-provider.h>
|
|
|
|
#include "stratix10-clk.h"
|
|
#include "clk.h"
|
|
|
|
#define CLK_MGR_FREE_SHIFT 16
|
|
#define CLK_MGR_FREE_MASK 0x7
|
|
#define SWCTRLBTCLKSEN_SHIFT 8
|
|
|
|
#define to_periph_clk(p) container_of(p, struct socfpga_periph_clk, hw.hw)
|
|
|
|
static unsigned long clk_peri_c_clk_recalc_rate(struct clk_hw *hwclk,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk);
|
|
unsigned long div = 1;
|
|
u32 val;
|
|
|
|
val = readl(socfpgaclk->hw.reg);
|
|
val &= GENMASK(SWCTRLBTCLKSEN_SHIFT - 1, 0);
|
|
parent_rate /= val;
|
|
|
|
return parent_rate / div;
|
|
}
|
|
|
|
static unsigned long clk_peri_cnt_clk_recalc_rate(struct clk_hw *hwclk,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk);
|
|
unsigned long div = 1;
|
|
|
|
if (socfpgaclk->fixed_div) {
|
|
div = socfpgaclk->fixed_div;
|
|
} else {
|
|
if (socfpgaclk->hw.reg)
|
|
div = ((readl(socfpgaclk->hw.reg) & 0x7ff) + 1);
|
|
}
|
|
|
|
return parent_rate / div;
|
|
}
|
|
|
|
static u8 clk_periclk_get_parent(struct clk_hw *hwclk)
|
|
{
|
|
struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk);
|
|
u32 clk_src, mask;
|
|
u8 parent;
|
|
|
|
if (socfpgaclk->bypass_reg) {
|
|
mask = (0x1 << socfpgaclk->bypass_shift);
|
|
parent = ((readl(socfpgaclk->bypass_reg) & mask) >>
|
|
socfpgaclk->bypass_shift);
|
|
} else {
|
|
clk_src = readl(socfpgaclk->hw.reg);
|
|
parent = (clk_src >> CLK_MGR_FREE_SHIFT) &
|
|
CLK_MGR_FREE_MASK;
|
|
}
|
|
return parent;
|
|
}
|
|
|
|
static const struct clk_ops peri_c_clk_ops = {
|
|
.recalc_rate = clk_peri_c_clk_recalc_rate,
|
|
.get_parent = clk_periclk_get_parent,
|
|
};
|
|
|
|
static const struct clk_ops peri_cnt_clk_ops = {
|
|
.recalc_rate = clk_peri_cnt_clk_recalc_rate,
|
|
.get_parent = clk_periclk_get_parent,
|
|
};
|
|
|
|
struct clk *s10_register_periph(const char *name, const char *parent_name,
|
|
const char * const *parent_names,
|
|
u8 num_parents, unsigned long flags,
|
|
void __iomem *reg, unsigned long offset)
|
|
{
|
|
struct clk *clk;
|
|
struct socfpga_periph_clk *periph_clk;
|
|
struct clk_init_data init = {};
|
|
|
|
periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL);
|
|
if (WARN_ON(!periph_clk))
|
|
return NULL;
|
|
|
|
periph_clk->hw.reg = reg + offset;
|
|
|
|
init.name = name;
|
|
init.ops = &peri_c_clk_ops;
|
|
init.flags = flags;
|
|
|
|
init.num_parents = num_parents;
|
|
init.parent_names = parent_names ? parent_names : &parent_name;
|
|
|
|
periph_clk->hw.hw.init = &init;
|
|
|
|
clk = clk_register(NULL, &periph_clk->hw.hw);
|
|
if (WARN_ON(IS_ERR(clk))) {
|
|
kfree(periph_clk);
|
|
return NULL;
|
|
}
|
|
return clk;
|
|
}
|
|
|
|
struct clk *s10_register_cnt_periph(const char *name, const char *parent_name,
|
|
const char * const *parent_names,
|
|
u8 num_parents, unsigned long flags,
|
|
void __iomem *regbase, unsigned long offset,
|
|
u8 fixed_divider, unsigned long bypass_reg,
|
|
unsigned long bypass_shift)
|
|
{
|
|
struct clk *clk;
|
|
struct socfpga_periph_clk *periph_clk;
|
|
struct clk_init_data init = {};
|
|
|
|
periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL);
|
|
if (WARN_ON(!periph_clk))
|
|
return NULL;
|
|
|
|
if (offset)
|
|
periph_clk->hw.reg = regbase + offset;
|
|
else
|
|
periph_clk->hw.reg = NULL;
|
|
|
|
if (bypass_reg)
|
|
periph_clk->bypass_reg = regbase + bypass_reg;
|
|
else
|
|
periph_clk->bypass_reg = NULL;
|
|
periph_clk->bypass_shift = bypass_shift;
|
|
periph_clk->fixed_div = fixed_divider;
|
|
|
|
init.name = name;
|
|
init.ops = &peri_cnt_clk_ops;
|
|
init.flags = flags;
|
|
|
|
init.num_parents = num_parents;
|
|
init.parent_names = parent_names ? parent_names : &parent_name;
|
|
|
|
periph_clk->hw.hw.init = &init;
|
|
|
|
clk = clk_register(NULL, &periph_clk->hw.hw);
|
|
if (WARN_ON(IS_ERR(clk))) {
|
|
kfree(periph_clk);
|
|
return NULL;
|
|
}
|
|
return clk;
|
|
}
|