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/*
* arch/sh/kernel/cpu/sh2a/clock-sh7269.c
*
* SH7269 clock framework support
*
* Copyright (C) 2012 Phil Edworthy
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/clkdev.h>
#include <asm/clock.h>
/* SH7269 registers */
#define FRQCR 0xfffe0010
#define STBCR3 0xfffe0408
#define STBCR4 0xfffe040c
#define STBCR5 0xfffe0410
#define STBCR6 0xfffe0414
#define STBCR7 0xfffe0418
#define PLL_RATE 20
/* Fixed 32 KHz root clock for RTC */
static struct clk r_clk = {
.rate = 32768,
};
/*
* Default rate for the root input clock, reset this with clk_set_rate()
* from the platform code.
*/
static struct clk extal_clk = {
.rate = 13340000,
};
static unsigned long pll_recalc(struct clk *clk)
{
return clk->parent->rate * PLL_RATE;
}
static struct sh_clk_ops pll_clk_ops = {
.recalc = pll_recalc,
};
static struct clk pll_clk = {
.ops = &pll_clk_ops,
.parent = &extal_clk,
.flags = CLK_ENABLE_ON_INIT,
};
static unsigned long peripheral0_recalc(struct clk *clk)
{
return clk->parent->rate / 8;
}
static struct sh_clk_ops peripheral0_clk_ops = {
.recalc = peripheral0_recalc,
};
static struct clk peripheral0_clk = {
.ops = &peripheral0_clk_ops,
.parent = &pll_clk,
.flags = CLK_ENABLE_ON_INIT,
};
static unsigned long peripheral1_recalc(struct clk *clk)
{
return clk->parent->rate / 4;
}
static struct sh_clk_ops peripheral1_clk_ops = {
.recalc = peripheral1_recalc,
};
static struct clk peripheral1_clk = {
.ops = &peripheral1_clk_ops,
.parent = &pll_clk,
.flags = CLK_ENABLE_ON_INIT,
};
struct clk *main_clks[] = {
&r_clk,
&extal_clk,
&pll_clk,
&peripheral0_clk,
&peripheral1_clk,
};
static int div2[] = { 1, 2, 0, 4 };
static struct clk_div_mult_table div4_div_mult_table = {
.divisors = div2,
.nr_divisors = ARRAY_SIZE(div2),
};
static struct clk_div4_table div4_table = {
.div_mult_table = &div4_div_mult_table,
};
enum { DIV4_I, DIV4_B,
DIV4_NR };
#define DIV4(_reg, _bit, _mask, _flags) \
SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
/* The mask field specifies the div2 entries that are valid */
struct clk div4_clks[DIV4_NR] = {
[DIV4_I] = DIV4(FRQCR, 8, 0xB, CLK_ENABLE_REG_16BIT
| CLK_ENABLE_ON_INIT),
[DIV4_B] = DIV4(FRQCR, 4, 0xA, CLK_ENABLE_REG_16BIT
| CLK_ENABLE_ON_INIT),
};
enum { MSTP72,
MSTP60,
MSTP47, MSTP46, MSTP45, MSTP44, MSTP43, MSTP42, MSTP41, MSTP40,
MSTP35, MSTP32, MSTP30,
MSTP_NR };
static struct clk mstp_clks[MSTP_NR] = {
[MSTP72] = SH_CLK_MSTP8(&peripheral0_clk, STBCR7, 2, 0), /* CMT */
[MSTP60] = SH_CLK_MSTP8(&peripheral1_clk, STBCR6, 0, 0), /* USB */
[MSTP47] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 7, 0), /* SCIF0 */
[MSTP46] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 6, 0), /* SCIF1 */
[MSTP45] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 5, 0), /* SCIF2 */
[MSTP44] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 4, 0), /* SCIF3 */
[MSTP43] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 3, 0), /* SCIF4 */
[MSTP42] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 2, 0), /* SCIF5 */
[MSTP41] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 1, 0), /* SCIF6 */
[MSTP40] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 0, 0), /* SCIF7 */
[MSTP35] = SH_CLK_MSTP8(&peripheral0_clk, STBCR3, 5, 0), /* MTU2 */
[MSTP32] = SH_CLK_MSTP8(&peripheral1_clk, STBCR3, 2, 0), /* ADC */
[MSTP30] = SH_CLK_MSTP8(&r_clk, STBCR3, 0, 0), /* RTC */
};
static struct clk_lookup lookups[] = {
/* main clocks */
CLKDEV_CON_ID("rclk", &r_clk),
CLKDEV_CON_ID("extal", &extal_clk),
CLKDEV_CON_ID("pll_clk", &pll_clk),
CLKDEV_CON_ID("peripheral_clk", &peripheral1_clk),
/* DIV4 clocks */
CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
/* MSTP clocks */
CLKDEV_ICK_ID("sci_fck", "sh-sci.0", &mstp_clks[MSTP47]),
CLKDEV_ICK_ID("sci_fck", "sh-sci.1", &mstp_clks[MSTP46]),
CLKDEV_ICK_ID("sci_fck", "sh-sci.2", &mstp_clks[MSTP45]),
CLKDEV_ICK_ID("sci_fck", "sh-sci.3", &mstp_clks[MSTP44]),
CLKDEV_ICK_ID("sci_fck", "sh-sci.4", &mstp_clks[MSTP43]),
CLKDEV_ICK_ID("sci_fck", "sh-sci.5", &mstp_clks[MSTP42]),
CLKDEV_ICK_ID("sci_fck", "sh-sci.6", &mstp_clks[MSTP41]),
CLKDEV_ICK_ID("sci_fck", "sh-sci.7", &mstp_clks[MSTP40]),
CLKDEV_ICK_ID("fck", "sh-cmt-16.0", &mstp_clks[MSTP72]),
CLKDEV_CON_ID("usb0", &mstp_clks[MSTP60]),
CLKDEV_CON_ID("mtu2_fck", &mstp_clks[MSTP35]),
CLKDEV_CON_ID("adc0", &mstp_clks[MSTP32]),
CLKDEV_CON_ID("rtc0", &mstp_clks[MSTP30]),
};
int __init arch_clk_init(void)
{
int k, ret = 0;
for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
ret = clk_register(main_clks[k]);
clkdev_add_table(lookups, ARRAY_SIZE(lookups));
if (!ret)
ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
if (!ret)
ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
return ret;
}
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