mirror of https://gitee.com/openkylin/linux.git
375 lines
8.5 KiB
C
375 lines
8.5 KiB
C
/*
|
|
* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
|
|
*
|
|
* 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/clk/at91_pmc.h>
|
|
#include <linux/of.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "pmc.h"
|
|
|
|
#define SAM9X5_USB_DIV_SHIFT 8
|
|
#define SAM9X5_USB_MAX_DIV 0xf
|
|
|
|
#define RM9200_USB_DIV_SHIFT 28
|
|
#define RM9200_USB_DIV_TAB_SIZE 4
|
|
|
|
struct at91sam9x5_clk_usb {
|
|
struct clk_hw hw;
|
|
struct regmap *regmap;
|
|
};
|
|
|
|
#define to_at91sam9x5_clk_usb(hw) \
|
|
container_of(hw, struct at91sam9x5_clk_usb, hw)
|
|
|
|
struct at91rm9200_clk_usb {
|
|
struct clk_hw hw;
|
|
struct regmap *regmap;
|
|
u32 divisors[4];
|
|
};
|
|
|
|
#define to_at91rm9200_clk_usb(hw) \
|
|
container_of(hw, struct at91rm9200_clk_usb, hw)
|
|
|
|
static unsigned long at91sam9x5_clk_usb_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
|
|
unsigned int usbr;
|
|
u8 usbdiv;
|
|
|
|
regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
|
|
usbdiv = (usbr & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;
|
|
|
|
return DIV_ROUND_CLOSEST(parent_rate, (usbdiv + 1));
|
|
}
|
|
|
|
static int at91sam9x5_clk_usb_determine_rate(struct clk_hw *hw,
|
|
struct clk_rate_request *req)
|
|
{
|
|
struct clk_hw *parent;
|
|
long best_rate = -EINVAL;
|
|
unsigned long tmp_rate;
|
|
int best_diff = -1;
|
|
int tmp_diff;
|
|
int i;
|
|
|
|
for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
|
|
int div;
|
|
|
|
parent = clk_hw_get_parent_by_index(hw, i);
|
|
if (!parent)
|
|
continue;
|
|
|
|
for (div = 1; div < SAM9X5_USB_MAX_DIV + 2; div++) {
|
|
unsigned long tmp_parent_rate;
|
|
|
|
tmp_parent_rate = req->rate * div;
|
|
tmp_parent_rate = clk_hw_round_rate(parent,
|
|
tmp_parent_rate);
|
|
tmp_rate = DIV_ROUND_CLOSEST(tmp_parent_rate, div);
|
|
if (tmp_rate < req->rate)
|
|
tmp_diff = req->rate - tmp_rate;
|
|
else
|
|
tmp_diff = tmp_rate - req->rate;
|
|
|
|
if (best_diff < 0 || best_diff > tmp_diff) {
|
|
best_rate = tmp_rate;
|
|
best_diff = tmp_diff;
|
|
req->best_parent_rate = tmp_parent_rate;
|
|
req->best_parent_hw = parent;
|
|
}
|
|
|
|
if (!best_diff || tmp_rate < req->rate)
|
|
break;
|
|
}
|
|
|
|
if (!best_diff)
|
|
break;
|
|
}
|
|
|
|
if (best_rate < 0)
|
|
return best_rate;
|
|
|
|
req->rate = best_rate;
|
|
return 0;
|
|
}
|
|
|
|
static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
|
|
{
|
|
struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
|
|
|
|
if (index > 1)
|
|
return -EINVAL;
|
|
|
|
regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS,
|
|
index ? AT91_PMC_USBS : 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
|
|
{
|
|
struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
|
|
unsigned int usbr;
|
|
|
|
regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
|
|
|
|
return usbr & AT91_PMC_USBS;
|
|
}
|
|
|
|
static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
|
|
unsigned long div;
|
|
|
|
if (!rate)
|
|
return -EINVAL;
|
|
|
|
div = DIV_ROUND_CLOSEST(parent_rate, rate);
|
|
if (div > SAM9X5_USB_MAX_DIV + 1 || !div)
|
|
return -EINVAL;
|
|
|
|
regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_OHCIUSBDIV,
|
|
(div - 1) << SAM9X5_USB_DIV_SHIFT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct clk_ops at91sam9x5_usb_ops = {
|
|
.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
|
|
.determine_rate = at91sam9x5_clk_usb_determine_rate,
|
|
.get_parent = at91sam9x5_clk_usb_get_parent,
|
|
.set_parent = at91sam9x5_clk_usb_set_parent,
|
|
.set_rate = at91sam9x5_clk_usb_set_rate,
|
|
};
|
|
|
|
static int at91sam9n12_clk_usb_enable(struct clk_hw *hw)
|
|
{
|
|
struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
|
|
|
|
regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS,
|
|
AT91_PMC_USBS);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void at91sam9n12_clk_usb_disable(struct clk_hw *hw)
|
|
{
|
|
struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
|
|
|
|
regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS, 0);
|
|
}
|
|
|
|
static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)
|
|
{
|
|
struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
|
|
unsigned int usbr;
|
|
|
|
regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
|
|
|
|
return usbr & AT91_PMC_USBS;
|
|
}
|
|
|
|
static const struct clk_ops at91sam9n12_usb_ops = {
|
|
.enable = at91sam9n12_clk_usb_enable,
|
|
.disable = at91sam9n12_clk_usb_disable,
|
|
.is_enabled = at91sam9n12_clk_usb_is_enabled,
|
|
.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
|
|
.determine_rate = at91sam9x5_clk_usb_determine_rate,
|
|
.set_rate = at91sam9x5_clk_usb_set_rate,
|
|
};
|
|
|
|
struct clk_hw * __init
|
|
at91sam9x5_clk_register_usb(struct regmap *regmap, const char *name,
|
|
const char **parent_names, u8 num_parents)
|
|
{
|
|
struct at91sam9x5_clk_usb *usb;
|
|
struct clk_hw *hw;
|
|
struct clk_init_data init;
|
|
int ret;
|
|
|
|
usb = kzalloc(sizeof(*usb), GFP_KERNEL);
|
|
if (!usb)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
init.name = name;
|
|
init.ops = &at91sam9x5_usb_ops;
|
|
init.parent_names = parent_names;
|
|
init.num_parents = num_parents;
|
|
init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE |
|
|
CLK_SET_RATE_PARENT;
|
|
|
|
usb->hw.init = &init;
|
|
usb->regmap = regmap;
|
|
|
|
hw = &usb->hw;
|
|
ret = clk_hw_register(NULL, &usb->hw);
|
|
if (ret) {
|
|
kfree(usb);
|
|
hw = ERR_PTR(ret);
|
|
}
|
|
|
|
return hw;
|
|
}
|
|
|
|
struct clk_hw * __init
|
|
at91sam9n12_clk_register_usb(struct regmap *regmap, const char *name,
|
|
const char *parent_name)
|
|
{
|
|
struct at91sam9x5_clk_usb *usb;
|
|
struct clk_hw *hw;
|
|
struct clk_init_data init;
|
|
int ret;
|
|
|
|
usb = kzalloc(sizeof(*usb), GFP_KERNEL);
|
|
if (!usb)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
init.name = name;
|
|
init.ops = &at91sam9n12_usb_ops;
|
|
init.parent_names = &parent_name;
|
|
init.num_parents = 1;
|
|
init.flags = CLK_SET_RATE_GATE | CLK_SET_RATE_PARENT;
|
|
|
|
usb->hw.init = &init;
|
|
usb->regmap = regmap;
|
|
|
|
hw = &usb->hw;
|
|
ret = clk_hw_register(NULL, &usb->hw);
|
|
if (ret) {
|
|
kfree(usb);
|
|
hw = ERR_PTR(ret);
|
|
}
|
|
|
|
return hw;
|
|
}
|
|
|
|
static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
|
|
unsigned int pllbr;
|
|
u8 usbdiv;
|
|
|
|
regmap_read(usb->regmap, AT91_CKGR_PLLBR, &pllbr);
|
|
|
|
usbdiv = (pllbr & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;
|
|
if (usb->divisors[usbdiv])
|
|
return parent_rate / usb->divisors[usbdiv];
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long *parent_rate)
|
|
{
|
|
struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
|
|
struct clk_hw *parent = clk_hw_get_parent(hw);
|
|
unsigned long bestrate = 0;
|
|
int bestdiff = -1;
|
|
unsigned long tmprate;
|
|
int tmpdiff;
|
|
int i = 0;
|
|
|
|
for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
|
|
unsigned long tmp_parent_rate;
|
|
|
|
if (!usb->divisors[i])
|
|
continue;
|
|
|
|
tmp_parent_rate = rate * usb->divisors[i];
|
|
tmp_parent_rate = clk_hw_round_rate(parent, tmp_parent_rate);
|
|
tmprate = DIV_ROUND_CLOSEST(tmp_parent_rate, usb->divisors[i]);
|
|
if (tmprate < rate)
|
|
tmpdiff = rate - tmprate;
|
|
else
|
|
tmpdiff = tmprate - rate;
|
|
|
|
if (bestdiff < 0 || bestdiff > tmpdiff) {
|
|
bestrate = tmprate;
|
|
bestdiff = tmpdiff;
|
|
*parent_rate = tmp_parent_rate;
|
|
}
|
|
|
|
if (!bestdiff)
|
|
break;
|
|
}
|
|
|
|
return bestrate;
|
|
}
|
|
|
|
static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
int i;
|
|
struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
|
|
unsigned long div;
|
|
|
|
if (!rate)
|
|
return -EINVAL;
|
|
|
|
div = DIV_ROUND_CLOSEST(parent_rate, rate);
|
|
|
|
for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
|
|
if (usb->divisors[i] == div) {
|
|
regmap_update_bits(usb->regmap, AT91_CKGR_PLLBR,
|
|
AT91_PMC_USBDIV,
|
|
i << RM9200_USB_DIV_SHIFT);
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static const struct clk_ops at91rm9200_usb_ops = {
|
|
.recalc_rate = at91rm9200_clk_usb_recalc_rate,
|
|
.round_rate = at91rm9200_clk_usb_round_rate,
|
|
.set_rate = at91rm9200_clk_usb_set_rate,
|
|
};
|
|
|
|
struct clk_hw * __init
|
|
at91rm9200_clk_register_usb(struct regmap *regmap, const char *name,
|
|
const char *parent_name, const u32 *divisors)
|
|
{
|
|
struct at91rm9200_clk_usb *usb;
|
|
struct clk_hw *hw;
|
|
struct clk_init_data init;
|
|
int ret;
|
|
|
|
usb = kzalloc(sizeof(*usb), GFP_KERNEL);
|
|
if (!usb)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
init.name = name;
|
|
init.ops = &at91rm9200_usb_ops;
|
|
init.parent_names = &parent_name;
|
|
init.num_parents = 1;
|
|
init.flags = CLK_SET_RATE_PARENT;
|
|
|
|
usb->hw.init = &init;
|
|
usb->regmap = regmap;
|
|
memcpy(usb->divisors, divisors, sizeof(usb->divisors));
|
|
|
|
hw = &usb->hw;
|
|
ret = clk_hw_register(NULL, &usb->hw);
|
|
if (ret) {
|
|
kfree(usb);
|
|
hw = ERR_PTR(ret);
|
|
}
|
|
|
|
return hw;
|
|
}
|