forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
86 lines
2.0 KiB
86 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* arch/sh/kernel/cpu/sh3/clock-sh3.c |
|
* |
|
* Generic SH-3 support for the clock framework |
|
* |
|
* Copyright (C) 2005 Paul Mundt |
|
* |
|
* FRQCR parsing hacked out of arch/sh/kernel/time.c |
|
* |
|
* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka |
|
* Copyright (C) 2000 Philipp Rumpf <[email protected]> |
|
* Copyright (C) 2002, 2003, 2004 Paul Mundt |
|
* Copyright (C) 2002 M. R. Brown <[email protected]> |
|
*/ |
|
#include <linux/init.h> |
|
#include <linux/kernel.h> |
|
#include <asm/clock.h> |
|
#include <asm/freq.h> |
|
#include <asm/io.h> |
|
|
|
static int stc_multipliers[] = { 1, 2, 3, 4, 6, 1, 1, 1 }; |
|
static int ifc_divisors[] = { 1, 2, 3, 4, 1, 1, 1, 1 }; |
|
static int pfc_divisors[] = { 1, 2, 3, 4, 6, 1, 1, 1 }; |
|
|
|
static void master_clk_init(struct clk *clk) |
|
{ |
|
int frqcr = __raw_readw(FRQCR); |
|
int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003); |
|
|
|
clk->rate *= pfc_divisors[idx]; |
|
} |
|
|
|
static struct sh_clk_ops sh3_master_clk_ops = { |
|
.init = master_clk_init, |
|
}; |
|
|
|
static unsigned long module_clk_recalc(struct clk *clk) |
|
{ |
|
int frqcr = __raw_readw(FRQCR); |
|
int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003); |
|
|
|
return clk->parent->rate / pfc_divisors[idx]; |
|
} |
|
|
|
static struct sh_clk_ops sh3_module_clk_ops = { |
|
.recalc = module_clk_recalc, |
|
}; |
|
|
|
static unsigned long bus_clk_recalc(struct clk *clk) |
|
{ |
|
int frqcr = __raw_readw(FRQCR); |
|
int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4); |
|
|
|
return clk->parent->rate / stc_multipliers[idx]; |
|
} |
|
|
|
static struct sh_clk_ops sh3_bus_clk_ops = { |
|
.recalc = bus_clk_recalc, |
|
}; |
|
|
|
static unsigned long cpu_clk_recalc(struct clk *clk) |
|
{ |
|
int frqcr = __raw_readw(FRQCR); |
|
int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2); |
|
|
|
return clk->parent->rate / ifc_divisors[idx]; |
|
} |
|
|
|
static struct sh_clk_ops sh3_cpu_clk_ops = { |
|
.recalc = cpu_clk_recalc, |
|
}; |
|
|
|
static struct sh_clk_ops *sh3_clk_ops[] = { |
|
&sh3_master_clk_ops, |
|
&sh3_module_clk_ops, |
|
&sh3_bus_clk_ops, |
|
&sh3_cpu_clk_ops, |
|
}; |
|
|
|
void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) |
|
{ |
|
if (idx < ARRAY_SIZE(sh3_clk_ops)) |
|
*ops = sh3_clk_ops[idx]; |
|
} |
|
|
|
|