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/*
* Cirrus Logic CLPS711X CLK driver
*
* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/mfd/syscon/clps711x.h>
#include <dt-bindings/clock/clps711x-clock.h>
#define CLPS711X_SYSCON1 (0x0100)
#define CLPS711X_SYSCON2 (0x1100)
#define CLPS711X_SYSFLG2 (CLPS711X_SYSCON2 + SYSFLG_OFFSET)
#define CLPS711X_PLLR (0xa5a8)
#define CLPS711X_EXT_FREQ (13000000)
#define CLPS711X_OSC_FREQ (3686400)
static const struct clk_div_table spi_div_table[] = {
{ .val = 0, .div = 32, },
{ .val = 1, .div = 8, },
{ .val = 2, .div = 2, },
{ .val = 3, .div = 1, },
};
static const struct clk_div_table timer_div_table[] = {
{ .val = 0, .div = 256, },
{ .val = 1, .div = 1, },
};
struct clps711x_clk {
struct clk_onecell_data clk_data;
spinlock_t lock;
struct clk *clks[CLPS711X_CLK_MAX];
};
static struct clps711x_clk * __init _clps711x_clk_init(void __iomem *base,
u32 fref)
{
u32 tmp, f_cpu, f_pll, f_bus, f_tim, f_pwm, f_spi;
struct clps711x_clk *clps711x_clk;
unsigned i;
if (!base)
return ERR_PTR(-ENOMEM);
clps711x_clk = kzalloc(sizeof(*clps711x_clk), GFP_KERNEL);
if (!clps711x_clk)
return ERR_PTR(-ENOMEM);
spin_lock_init(&clps711x_clk->lock);
/* Read PLL multiplier value and sanity check */
tmp = readl(base + CLPS711X_PLLR) >> 24;
if (((tmp >= 10) && (tmp <= 50)) || !fref)
f_pll = DIV_ROUND_UP(CLPS711X_OSC_FREQ * tmp, 2);
else
f_pll = fref;
tmp = readl(base + CLPS711X_SYSFLG2);
if (tmp & SYSFLG2_CKMODE) {
f_cpu = CLPS711X_EXT_FREQ;
f_bus = CLPS711X_EXT_FREQ;
f_spi = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 96);
f_pll = 0;
f_pwm = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 128);
} else {
f_cpu = f_pll;
if (f_cpu > 36864000)
f_bus = DIV_ROUND_UP(f_cpu, 2);
else
f_bus = 36864000 / 2;
f_spi = DIV_ROUND_CLOSEST(f_cpu, 576);
f_pwm = DIV_ROUND_CLOSEST(f_cpu, 768);
}
if (tmp & SYSFLG2_CKMODE) {
if (readl(base + CLPS711X_SYSCON2) & SYSCON2_OSTB)
f_tim = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 26);
else
f_tim = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 24);
} else
f_tim = DIV_ROUND_CLOSEST(f_cpu, 144);
tmp = readl(base + CLPS711X_SYSCON1);
/* Timer1 in free running mode.
* Counter will wrap around to 0xffff when it underflows
* and will continue to count down.
*/
tmp &= ~(SYSCON1_TC1M | SYSCON1_TC1S);
/* Timer2 in prescale mode.
* Value writen is automatically re-loaded when
* the counter underflows.
*/
tmp |= SYSCON1_TC2M | SYSCON1_TC2S;
writel(tmp, base + CLPS711X_SYSCON1);
clps711x_clk->clks[CLPS711X_CLK_DUMMY] =
clk_register_fixed_rate(NULL, "dummy", NULL, 0, 0);
clps711x_clk->clks[CLPS711X_CLK_CPU] =
clk_register_fixed_rate(NULL, "cpu", NULL, 0, f_cpu);
clps711x_clk->clks[CLPS711X_CLK_BUS] =
clk_register_fixed_rate(NULL, "bus", NULL, 0, f_bus);
clps711x_clk->clks[CLPS711X_CLK_PLL] =
clk_register_fixed_rate(NULL, "pll", NULL, 0, f_pll);
clps711x_clk->clks[CLPS711X_CLK_TIMERREF] =
clk_register_fixed_rate(NULL, "timer_ref", NULL, 0, f_tim);
clps711x_clk->clks[CLPS711X_CLK_TIMER1] =
clk_register_divider_table(NULL, "timer1", "timer_ref", 0,
base + CLPS711X_SYSCON1, 5, 1, 0,
timer_div_table, &clps711x_clk->lock);
clps711x_clk->clks[CLPS711X_CLK_TIMER2] =
clk_register_divider_table(NULL, "timer2", "timer_ref", 0,
base + CLPS711X_SYSCON1, 7, 1, 0,
timer_div_table, &clps711x_clk->lock);
clps711x_clk->clks[CLPS711X_CLK_PWM] =
clk_register_fixed_rate(NULL, "pwm", NULL, 0, f_pwm);
clps711x_clk->clks[CLPS711X_CLK_SPIREF] =
clk_register_fixed_rate(NULL, "spi_ref", NULL, 0, f_spi);
clps711x_clk->clks[CLPS711X_CLK_SPI] =
clk_register_divider_table(NULL, "spi", "spi_ref", 0,
base + CLPS711X_SYSCON1, 16, 2, 0,
spi_div_table, &clps711x_clk->lock);
clps711x_clk->clks[CLPS711X_CLK_UART] =
clk_register_fixed_factor(NULL, "uart", "bus", 0, 1, 10);
clps711x_clk->clks[CLPS711X_CLK_TICK] =
clk_register_fixed_rate(NULL, "tick", NULL, 0, 64);
for (i = 0; i < CLPS711X_CLK_MAX; i++)
if (IS_ERR(clps711x_clk->clks[i]))
pr_err("clk %i: register failed with %ld\n",
i, PTR_ERR(clps711x_clk->clks[i]));
return clps711x_clk;
}
void __init clps711x_clk_init(void __iomem *base)
{
struct clps711x_clk *clps711x_clk;
clps711x_clk = _clps711x_clk_init(base, 73728000);
BUG_ON(IS_ERR(clps711x_clk));
/* Clocksource */
clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_TIMER1],
NULL, "clps711x-timer.0");
clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_TIMER2],
NULL, "clps711x-timer.1");
/* Drivers */
clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_PWM],
NULL, "clps711x-pwm");
clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_UART],
NULL, "clps711x-uart.0");
clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_UART],
NULL, "clps711x-uart.1");
}
#ifdef CONFIG_OF
static void __init clps711x_clk_init_dt(struct device_node *np)
{
void __iomem *base = of_iomap(np, 0);
struct clps711x_clk *clps711x_clk;
u32 fref = 0;
WARN_ON(of_property_read_u32(np, "startup-frequency", &fref));
clps711x_clk = _clps711x_clk_init(base, fref);
BUG_ON(IS_ERR(clps711x_clk));
clps711x_clk->clk_data.clks = clps711x_clk->clks;
clps711x_clk->clk_data.clk_num = CLPS711X_CLK_MAX;
of_clk_add_provider(np, of_clk_src_onecell_get,
&clps711x_clk->clk_data);
}
CLK_OF_DECLARE(clps711x, "cirrus,clps711x-clk", clps711x_clk_init_dt);
#endif
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