linux/drivers/clk/at91/clk-usb.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

391 lines
8.9 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
*/
#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
#define SAM9X5_USBS_MASK GENMASK(0, 0)
#define SAM9X60_USBS_MASK GENMASK(1, 0)
struct at91sam9x5_clk_usb {
struct clk_hw hw;
struct regmap *regmap;
u32 usbs_mask;
};
#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, usb->usbs_mask, index);
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 & usb->usbs_mask;
}
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,
};
static struct clk_hw * __init
_at91sam9x5_clk_register_usb(struct regmap *regmap, const char *name,
const char **parent_names, u8 num_parents,
u32 usbs_mask)
{
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;
usb->usbs_mask = SAM9X5_USBS_MASK;
hw = &usb->hw;
ret = clk_hw_register(NULL, &usb->hw);
if (ret) {
kfree(usb);
hw = ERR_PTR(ret);
}
return hw;
}
struct clk_hw * __init
at91sam9x5_clk_register_usb(struct regmap *regmap, const char *name,
const char **parent_names, u8 num_parents)
{
return _at91sam9x5_clk_register_usb(regmap, name, parent_names,
num_parents, SAM9X5_USBS_MASK);
}
struct clk_hw * __init
sam9x60_clk_register_usb(struct regmap *regmap, const char *name,
const char **parent_names, u8 num_parents)
{
return _at91sam9x5_clk_register_usb(regmap, name, parent_names,
num_parents, SAM9X60_USBS_MASK);
}
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;
}