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/*
* Copyright (C) 2014 Antony Pavlov <antonynpavlov@gmail.com>
*
* Based on the Linux ath79 clock code
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <common.h>
#include <init.h>
#include <io.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/err.h>
#include <mach/ath79.h>
#include <dt-bindings/clock/ath79-clk.h>
static struct clk *clks[ATH79_CLK_END];
static struct clk_onecell_data clk_data;
struct clk_ar933x {
struct clk clk;
void __iomem *base;
u32 div_shift;
u32 div_mask;
const char *parent;
};
static unsigned long clk_ar933x_recalc_rate(struct clk *clk,
unsigned long parent_rate)
{
struct clk_ar933x *f = container_of(clk, struct clk_ar933x, clk);
unsigned long rate;
unsigned long freq;
u32 clock_ctrl;
u32 cpu_config;
u32 t;
clock_ctrl = __raw_readl(f->base + AR933X_PLL_CLOCK_CTRL_REG);
if (clock_ctrl & AR933X_PLL_CLOCK_CTRL_BYPASS) {
rate = parent_rate;
} else {
cpu_config = __raw_readl(f->base + AR933X_PLL_CPU_CONFIG_REG);
t = (cpu_config >> AR933X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
AR933X_PLL_CPU_CONFIG_REFDIV_MASK;
freq = parent_rate / t;
t = (cpu_config >> AR933X_PLL_CPU_CONFIG_NINT_SHIFT) &
AR933X_PLL_CPU_CONFIG_NINT_MASK;
freq *= t;
t = (cpu_config >> AR933X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
AR933X_PLL_CPU_CONFIG_OUTDIV_MASK;
if (t == 0)
t = 1;
freq >>= t;
t = ((clock_ctrl >> f->div_shift) & f->div_mask) + 1;
rate = freq / t;
}
return rate;
}
struct clk_ops clk_ar933x_ops = {
.recalc_rate = clk_ar933x_recalc_rate,
};
static struct clk *clk_ar933x(const char *name, const char *parent,
void __iomem *base, u32 div_shift, u32 div_mask)
{
struct clk_ar933x *f = xzalloc(sizeof(*f));
f->parent = parent;
f->base = base;
f->div_shift = div_shift;
f->div_mask = div_mask;
f->clk.ops = &clk_ar933x_ops;
f->clk.name = name;
f->clk.parent_names = &f->parent;
f->clk.num_parents = 1;
clk_register(&f->clk);
return &f->clk;
}
static void ar933x_pll_init(void __iomem *base)
{
clks[ATH79_CLK_CPU] = clk_ar933x("cpu", "ref", base,
AR933X_PLL_CLOCK_CTRL_CPU_DIV_SHIFT,
AR933X_PLL_CLOCK_CTRL_CPU_DIV_MASK);
clks[ATH79_CLK_DDR] = clk_ar933x("ddr", "ref", base,
AR933X_PLL_CLOCK_CTRL_DDR_DIV_SHIFT,
AR933X_PLL_CLOCK_CTRL_DDR_DIV_MASK);
clks[ATH79_CLK_AHB] = clk_ar933x("ahb", "ref", base,
AR933X_PLL_CLOCK_CTRL_AHB_DIV_SHIFT,
AR933X_PLL_CLOCK_CTRL_AHB_DIV_MASK);
}
static int ar933x_clk_probe(struct device_d *dev)
{
struct resource *iores;
void __iomem *base;
iores = dev_request_mem_resource(dev, 0);
if (IS_ERR(iores))
return PTR_ERR(iores);
base = IOMEM(iores->start);
ar933x_pll_init(base);
clk_data.clks = clks;
clk_data.clk_num = ARRAY_SIZE(clks);
of_clk_add_provider(dev->device_node, of_clk_src_onecell_get,
&clk_data);
return 0;
}
static __maybe_unused struct of_device_id ar933x_clk_dt_ids[] = {
{
.compatible = "qca,ar9330-pll",
}, {
/* sentinel */
}
};
static struct driver_d ar933x_clk_driver = {
.probe = ar933x_clk_probe,
.name = "ar933x_clk",
.of_compatible = DRV_OF_COMPAT(ar933x_clk_dt_ids),
};
static int ar933x_clk_init(void)
{
return platform_driver_register(&ar933x_clk_driver);
}
postcore_initcall(ar933x_clk_init);
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