mirror of https://gitee.com/openkylin/linux.git
clk: at91: add PMC usb clock
This patch adds new at91 usb clock implementation using common clk framework. This clock is used to clock usb ports (ohci, ehci and udc). Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com> Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Boris BREZILLON
Nicolas Ferre
parent
f090fb37de
commit
c84a61d872
|
|
@ -3,6 +3,9 @@ if ARCH_AT91
|
|||
config HAVE_AT91_UTMI
|
||||
bool
|
||||
|
||||
config HAVE_AT91_USB_CLK
|
||||
bool
|
||||
|
||||
config HAVE_AT91_DBGU0
|
||||
bool
|
||||
|
||||
|
|
@ -82,6 +85,7 @@ config SOC_SAMA5D3
|
|||
select HAVE_AT91_DBGU1
|
||||
select AT91_USE_OLD_CLK
|
||||
select HAVE_AT91_UTMI
|
||||
select HAVE_AT91_USB_CLK
|
||||
help
|
||||
Select this if you are using one of Atmel's SAMA5D3 family SoC.
|
||||
This support covers SAMA5D31, SAMA5D33, SAMA5D34, SAMA5D35.
|
||||
|
|
@ -96,12 +100,14 @@ config SOC_AT91RM9200
|
|||
select MULTI_IRQ_HANDLER
|
||||
select SPARSE_IRQ
|
||||
select AT91_USE_OLD_CLK
|
||||
select HAVE_AT91_USB_CLK
|
||||
|
||||
config SOC_AT91SAM9260
|
||||
bool "AT91SAM9260, AT91SAM9XE or AT91SAM9G20"
|
||||
select HAVE_AT91_DBGU0
|
||||
select SOC_AT91SAM9
|
||||
select AT91_USE_OLD_CLK
|
||||
select HAVE_AT91_USB_CLK
|
||||
help
|
||||
Select this if you are using one of Atmel's AT91SAM9260, AT91SAM9XE
|
||||
or AT91SAM9G20 SoC.
|
||||
|
|
@ -112,6 +118,7 @@ config SOC_AT91SAM9261
|
|||
select HAVE_FB_ATMEL
|
||||
select SOC_AT91SAM9
|
||||
select AT91_USE_OLD_CLK
|
||||
select HAVE_AT91_USB_CLK
|
||||
help
|
||||
Select this if you are using one of Atmel's AT91SAM9261 or AT91SAM9G10 SoC.
|
||||
|
||||
|
|
@ -121,6 +128,7 @@ config SOC_AT91SAM9263
|
|||
select HAVE_FB_ATMEL
|
||||
select SOC_AT91SAM9
|
||||
select AT91_USE_OLD_CLK
|
||||
select HAVE_AT91_USB_CLK
|
||||
|
||||
config SOC_AT91SAM9RL
|
||||
bool "AT91SAM9RL"
|
||||
|
|
@ -137,6 +145,7 @@ config SOC_AT91SAM9G45
|
|||
select SOC_AT91SAM9
|
||||
select AT91_USE_OLD_CLK
|
||||
select HAVE_AT91_UTMI
|
||||
select HAVE_AT91_USB_CLK
|
||||
help
|
||||
Select this if you are using one of Atmel's AT91SAM9G45 family SoC.
|
||||
This support covers AT91SAM9G45, AT91SAM9G46, AT91SAM9M10 and AT91SAM9M11.
|
||||
|
|
@ -148,6 +157,7 @@ config SOC_AT91SAM9X5
|
|||
select SOC_AT91SAM9
|
||||
select AT91_USE_OLD_CLK
|
||||
select HAVE_AT91_UTMI
|
||||
select HAVE_AT91_USB_CLK
|
||||
help
|
||||
Select this if you are using one of Atmel's AT91SAM9x5 family SoC.
|
||||
This means that your SAM9 name finishes with a '5' (except if it is
|
||||
|
|
@ -161,6 +171,7 @@ config SOC_AT91SAM9N12
|
|||
select HAVE_FB_ATMEL
|
||||
select SOC_AT91SAM9
|
||||
select AT91_USE_OLD_CLK
|
||||
select HAVE_AT91_USB_CLK
|
||||
help
|
||||
Select this if you are using Atmel's AT91SAM9N12 SoC.
|
||||
|
||||
|
|
|
|||
|
|
@ -8,3 +8,4 @@ obj-y += clk-system.o clk-peripheral.o
|
|||
|
||||
obj-$(CONFIG_AT91_PROGRAMMABLE_CLOCKS) += clk-programmable.o
|
||||
obj-$(CONFIG_HAVE_AT91_UTMI) += clk-utmi.o
|
||||
obj-$(CONFIG_HAVE_AT91_USB_CLK) += clk-usb.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,398 @@
|
|||
/*
|
||||
* 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/of_address.h>
|
||||
#include <linux/io.h>
|
||||
|
||||
#include "pmc.h"
|
||||
|
||||
#define USB_SOURCE_MAX 2
|
||||
|
||||
#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 at91_pmc *pmc;
|
||||
};
|
||||
|
||||
#define to_at91sam9x5_clk_usb(hw) \
|
||||
container_of(hw, struct at91sam9x5_clk_usb, hw)
|
||||
|
||||
struct at91rm9200_clk_usb {
|
||||
struct clk_hw hw;
|
||||
struct at91_pmc *pmc;
|
||||
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)
|
||||
{
|
||||
u32 tmp;
|
||||
u8 usbdiv;
|
||||
struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
|
||||
struct at91_pmc *pmc = usb->pmc;
|
||||
|
||||
tmp = pmc_read(pmc, AT91_PMC_USB);
|
||||
usbdiv = (tmp & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;
|
||||
return parent_rate / (usbdiv + 1);
|
||||
}
|
||||
|
||||
static long at91sam9x5_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
|
||||
unsigned long *parent_rate)
|
||||
{
|
||||
unsigned long div;
|
||||
unsigned long bestrate;
|
||||
unsigned long tmp;
|
||||
|
||||
if (rate >= *parent_rate)
|
||||
return *parent_rate;
|
||||
|
||||
div = *parent_rate / rate;
|
||||
if (div >= SAM9X5_USB_MAX_DIV)
|
||||
return *parent_rate / (SAM9X5_USB_MAX_DIV + 1);
|
||||
|
||||
bestrate = *parent_rate / div;
|
||||
tmp = *parent_rate / (div + 1);
|
||||
if (bestrate - rate > rate - tmp)
|
||||
bestrate = tmp;
|
||||
|
||||
return bestrate;
|
||||
}
|
||||
|
||||
static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
|
||||
{
|
||||
u32 tmp;
|
||||
struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
|
||||
struct at91_pmc *pmc = usb->pmc;
|
||||
|
||||
if (index > 1)
|
||||
return -EINVAL;
|
||||
tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS;
|
||||
if (index)
|
||||
tmp |= AT91_PMC_USBS;
|
||||
pmc_write(pmc, AT91_PMC_USB, tmp);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
|
||||
{
|
||||
struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
|
||||
struct at91_pmc *pmc = usb->pmc;
|
||||
|
||||
return pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS;
|
||||
}
|
||||
|
||||
static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
|
||||
unsigned long parent_rate)
|
||||
{
|
||||
u32 tmp;
|
||||
struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
|
||||
struct at91_pmc *pmc = usb->pmc;
|
||||
unsigned long div = parent_rate / rate;
|
||||
|
||||
if (parent_rate % rate || div < 1 || div >= SAM9X5_USB_MAX_DIV)
|
||||
return -EINVAL;
|
||||
|
||||
tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_OHCIUSBDIV;
|
||||
tmp |= (div - 1) << SAM9X5_USB_DIV_SHIFT;
|
||||
pmc_write(pmc, AT91_PMC_USB, tmp);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct clk_ops at91sam9x5_usb_ops = {
|
||||
.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
|
||||
.round_rate = at91sam9x5_clk_usb_round_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);
|
||||
struct at91_pmc *pmc = usb->pmc;
|
||||
|
||||
pmc_write(pmc, AT91_PMC_USB,
|
||||
pmc_read(pmc, AT91_PMC_USB) | 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);
|
||||
struct at91_pmc *pmc = usb->pmc;
|
||||
|
||||
pmc_write(pmc, AT91_PMC_USB,
|
||||
pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS);
|
||||
}
|
||||
|
||||
static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)
|
||||
{
|
||||
struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
|
||||
struct at91_pmc *pmc = usb->pmc;
|
||||
|
||||
return !!(pmc_read(pmc, AT91_PMC_USB) & 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,
|
||||
.round_rate = at91sam9x5_clk_usb_round_rate,
|
||||
.set_rate = at91sam9x5_clk_usb_set_rate,
|
||||
};
|
||||
|
||||
static struct clk * __init
|
||||
at91sam9x5_clk_register_usb(struct at91_pmc *pmc, const char *name,
|
||||
const char **parent_names, u8 num_parents)
|
||||
{
|
||||
struct at91sam9x5_clk_usb *usb;
|
||||
struct clk *clk = NULL;
|
||||
struct clk_init_data init;
|
||||
|
||||
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;
|
||||
|
||||
usb->hw.init = &init;
|
||||
usb->pmc = pmc;
|
||||
|
||||
clk = clk_register(NULL, &usb->hw);
|
||||
if (IS_ERR(clk))
|
||||
kfree(usb);
|
||||
|
||||
return clk;
|
||||
}
|
||||
|
||||
static struct clk * __init
|
||||
at91sam9n12_clk_register_usb(struct at91_pmc *pmc, const char *name,
|
||||
const char *parent_name)
|
||||
{
|
||||
struct at91sam9x5_clk_usb *usb;
|
||||
struct clk *clk = NULL;
|
||||
struct clk_init_data init;
|
||||
|
||||
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;
|
||||
|
||||
usb->hw.init = &init;
|
||||
usb->pmc = pmc;
|
||||
|
||||
clk = clk_register(NULL, &usb->hw);
|
||||
if (IS_ERR(clk))
|
||||
kfree(usb);
|
||||
|
||||
return clk;
|
||||
}
|
||||
|
||||
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);
|
||||
struct at91_pmc *pmc = usb->pmc;
|
||||
u32 tmp;
|
||||
u8 usbdiv;
|
||||
|
||||
tmp = pmc_read(pmc, AT91_CKGR_PLLBR);
|
||||
usbdiv = (tmp & 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);
|
||||
unsigned long bestrate = 0;
|
||||
int bestdiff = -1;
|
||||
unsigned long tmprate;
|
||||
int tmpdiff;
|
||||
int i = 0;
|
||||
|
||||
for (i = 0; i < 4; i++) {
|
||||
if (!usb->divisors[i])
|
||||
continue;
|
||||
tmprate = *parent_rate / usb->divisors[i];
|
||||
if (tmprate < rate)
|
||||
tmpdiff = rate - tmprate;
|
||||
else
|
||||
tmpdiff = tmprate - rate;
|
||||
|
||||
if (bestdiff < 0 || bestdiff > tmpdiff) {
|
||||
bestrate = tmprate;
|
||||
bestdiff = tmpdiff;
|
||||
}
|
||||
|
||||
if (!bestdiff)
|
||||
break;
|
||||
}
|
||||
|
||||
return bestrate;
|
||||
}
|
||||
|
||||
static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
|
||||
unsigned long parent_rate)
|
||||
{
|
||||
u32 tmp;
|
||||
int i;
|
||||
struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
|
||||
struct at91_pmc *pmc = usb->pmc;
|
||||
unsigned long div = parent_rate / rate;
|
||||
|
||||
if (parent_rate % rate)
|
||||
return -EINVAL;
|
||||
for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
|
||||
if (usb->divisors[i] == div) {
|
||||
tmp = pmc_read(pmc, AT91_CKGR_PLLBR) &
|
||||
~AT91_PMC_USBDIV;
|
||||
tmp |= i << RM9200_USB_DIV_SHIFT;
|
||||
pmc_write(pmc, AT91_CKGR_PLLBR, tmp);
|
||||
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,
|
||||
};
|
||||
|
||||
static struct clk * __init
|
||||
at91rm9200_clk_register_usb(struct at91_pmc *pmc, const char *name,
|
||||
const char *parent_name, const u32 *divisors)
|
||||
{
|
||||
struct at91rm9200_clk_usb *usb;
|
||||
struct clk *clk = NULL;
|
||||
struct clk_init_data init;
|
||||
|
||||
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 = 0;
|
||||
|
||||
usb->hw.init = &init;
|
||||
usb->pmc = pmc;
|
||||
memcpy(usb->divisors, divisors, sizeof(usb->divisors));
|
||||
|
||||
clk = clk_register(NULL, &usb->hw);
|
||||
if (IS_ERR(clk))
|
||||
kfree(usb);
|
||||
|
||||
return clk;
|
||||
}
|
||||
|
||||
void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,
|
||||
struct at91_pmc *pmc)
|
||||
{
|
||||
struct clk *clk;
|
||||
int i;
|
||||
int num_parents;
|
||||
const char *parent_names[USB_SOURCE_MAX];
|
||||
const char *name = np->name;
|
||||
|
||||
num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells");
|
||||
if (num_parents <= 0 || num_parents > USB_SOURCE_MAX)
|
||||
return;
|
||||
|
||||
for (i = 0; i < num_parents; i++) {
|
||||
parent_names[i] = of_clk_get_parent_name(np, i);
|
||||
if (!parent_names[i])
|
||||
return;
|
||||
}
|
||||
|
||||
of_property_read_string(np, "clock-output-names", &name);
|
||||
|
||||
clk = at91sam9x5_clk_register_usb(pmc, name, parent_names, num_parents);
|
||||
if (IS_ERR(clk))
|
||||
return;
|
||||
|
||||
of_clk_add_provider(np, of_clk_src_simple_get, clk);
|
||||
}
|
||||
|
||||
void __init of_at91sam9n12_clk_usb_setup(struct device_node *np,
|
||||
struct at91_pmc *pmc)
|
||||
{
|
||||
struct clk *clk;
|
||||
const char *parent_name;
|
||||
const char *name = np->name;
|
||||
|
||||
parent_name = of_clk_get_parent_name(np, 0);
|
||||
if (!parent_name)
|
||||
return;
|
||||
|
||||
of_property_read_string(np, "clock-output-names", &name);
|
||||
|
||||
clk = at91sam9n12_clk_register_usb(pmc, name, parent_name);
|
||||
if (IS_ERR(clk))
|
||||
return;
|
||||
|
||||
of_clk_add_provider(np, of_clk_src_simple_get, clk);
|
||||
}
|
||||
|
||||
void __init of_at91rm9200_clk_usb_setup(struct device_node *np,
|
||||
struct at91_pmc *pmc)
|
||||
{
|
||||
struct clk *clk;
|
||||
const char *parent_name;
|
||||
const char *name = np->name;
|
||||
u32 divisors[4] = {0, 0, 0, 0};
|
||||
|
||||
parent_name = of_clk_get_parent_name(np, 0);
|
||||
if (!parent_name)
|
||||
return;
|
||||
|
||||
of_property_read_u32_array(np, "atmel,clk-divisors", divisors, 4);
|
||||
if (!divisors[0])
|
||||
return;
|
||||
|
||||
of_property_read_string(np, "clock-output-names", &name);
|
||||
|
||||
clk = at91rm9200_clk_register_usb(pmc, name, parent_name, divisors);
|
||||
if (IS_ERR(clk))
|
||||
return;
|
||||
|
||||
of_clk_add_provider(np, of_clk_src_simple_get, clk);
|
||||
}
|
||||
|
|
@ -299,6 +299,21 @@ static const struct of_device_id pmc_clk_ids[] __initdata = {
|
|||
.compatible = "atmel,at91sam9x5-clk-utmi",
|
||||
.data = of_at91sam9x5_clk_utmi_setup,
|
||||
},
|
||||
#endif
|
||||
/* USB clock */
|
||||
#if defined(CONFIG_HAVE_AT91_USB_CLK)
|
||||
{
|
||||
.compatible = "atmel,at91rm9200-clk-usb",
|
||||
.data = of_at91rm9200_clk_usb_setup,
|
||||
},
|
||||
{
|
||||
.compatible = "atmel,at91sam9x5-clk-usb",
|
||||
.data = of_at91sam9x5_clk_usb_setup,
|
||||
},
|
||||
{
|
||||
.compatible = "atmel,at91sam9n12-clk-usb",
|
||||
.data = of_at91sam9n12_clk_usb_setup,
|
||||
},
|
||||
#endif
|
||||
{ /*sentinel*/ }
|
||||
};
|
||||
|
|
|
|||
|
|
@ -99,4 +99,13 @@ extern void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np,
|
|||
struct at91_pmc *pmc);
|
||||
#endif
|
||||
|
||||
#if defined(CONFIG_HAVE_AT91_USB_CLK)
|
||||
extern void __init of_at91rm9200_clk_usb_setup(struct device_node *np,
|
||||
struct at91_pmc *pmc);
|
||||
extern void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,
|
||||
struct at91_pmc *pmc);
|
||||
extern void __init of_at91sam9n12_clk_usb_setup(struct device_node *np,
|
||||
struct at91_pmc *pmc);
|
||||
#endif
|
||||
|
||||
#endif /* __PMC_H_ */
|
||||
|
|
|
|||
Loading…
Reference in New Issue