clk: at91: add PMC utmi clock

This adds new at91 utmi clock implementation using common clk framework.

This clock is a pll with a fixed factor (x40).
It is used as a source for usb clock.

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 2013-10-11 12:22:06 +02:00 committed by Nicolas Ferre
parent 1f22f8bb64
commit f090fb37de
5 changed files with 179 additions and 0 deletions

View File

@ -1,5 +1,8 @@
if ARCH_AT91
config HAVE_AT91_UTMI
bool
config HAVE_AT91_DBGU0
bool
@ -78,6 +81,7 @@ config SOC_SAMA5D3
select HAVE_FB_ATMEL
select HAVE_AT91_DBGU1
select AT91_USE_OLD_CLK
select HAVE_AT91_UTMI
help
Select this if you are using one of Atmel's SAMA5D3 family SoC.
This support covers SAMA5D31, SAMA5D33, SAMA5D34, SAMA5D35.
@ -124,6 +128,7 @@ config SOC_AT91SAM9RL
select HAVE_FB_ATMEL
select SOC_AT91SAM9
select AT91_USE_OLD_CLK
select HAVE_AT91_UTMI
config SOC_AT91SAM9G45
bool "AT91SAM9G45 or AT91SAM9M10 families"
@ -131,6 +136,7 @@ config SOC_AT91SAM9G45
select HAVE_FB_ATMEL
select SOC_AT91SAM9
select AT91_USE_OLD_CLK
select HAVE_AT91_UTMI
help
Select this if you are using one of Atmel's AT91SAM9G45 family SoC.
This support covers AT91SAM9G45, AT91SAM9G46, AT91SAM9M10 and AT91SAM9M11.
@ -141,6 +147,7 @@ config SOC_AT91SAM9X5
select HAVE_FB_ATMEL
select SOC_AT91SAM9
select AT91_USE_OLD_CLK
select HAVE_AT91_UTMI
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

View File

@ -7,3 +7,4 @@ obj-y += clk-main.o clk-pll.o clk-plldiv.o clk-master.o
obj-y += clk-system.o clk-peripheral.o
obj-$(CONFIG_AT91_PROGRAMMABLE_CLOCKS) += clk-programmable.o
obj-$(CONFIG_HAVE_AT91_UTMI) += clk-utmi.o

159
drivers/clk/at91/clk-utmi.c Normal file
View File

@ -0,0 +1,159 @@
/*
* 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/interrupt.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/io.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include "pmc.h"
#define UTMI_FIXED_MUL 40
struct clk_utmi {
struct clk_hw hw;
struct at91_pmc *pmc;
unsigned int irq;
wait_queue_head_t wait;
};
#define to_clk_utmi(hw) container_of(hw, struct clk_utmi, hw)
static irqreturn_t clk_utmi_irq_handler(int irq, void *dev_id)
{
struct clk_utmi *utmi = (struct clk_utmi *)dev_id;
wake_up(&utmi->wait);
disable_irq_nosync(utmi->irq);
return IRQ_HANDLED;
}
static int clk_utmi_prepare(struct clk_hw *hw)
{
struct clk_utmi *utmi = to_clk_utmi(hw);
struct at91_pmc *pmc = utmi->pmc;
u32 tmp = at91_pmc_read(AT91_CKGR_UCKR) | AT91_PMC_UPLLEN |
AT91_PMC_UPLLCOUNT | AT91_PMC_BIASEN;
pmc_write(pmc, AT91_CKGR_UCKR, tmp);
while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU)) {
enable_irq(utmi->irq);
wait_event(utmi->wait,
pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU);
}
return 0;
}
static int clk_utmi_is_prepared(struct clk_hw *hw)
{
struct clk_utmi *utmi = to_clk_utmi(hw);
struct at91_pmc *pmc = utmi->pmc;
return !!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU);
}
static void clk_utmi_unprepare(struct clk_hw *hw)
{
struct clk_utmi *utmi = to_clk_utmi(hw);
struct at91_pmc *pmc = utmi->pmc;
u32 tmp = at91_pmc_read(AT91_CKGR_UCKR) & ~AT91_PMC_UPLLEN;
pmc_write(pmc, AT91_CKGR_UCKR, tmp);
}
static unsigned long clk_utmi_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
/* UTMI clk is a fixed clk multiplier */
return parent_rate * UTMI_FIXED_MUL;
}
static const struct clk_ops utmi_ops = {
.prepare = clk_utmi_prepare,
.unprepare = clk_utmi_unprepare,
.is_prepared = clk_utmi_is_prepared,
.recalc_rate = clk_utmi_recalc_rate,
};
static struct clk * __init
at91_clk_register_utmi(struct at91_pmc *pmc, unsigned int irq,
const char *name, const char *parent_name)
{
int ret;
struct clk_utmi *utmi;
struct clk *clk = NULL;
struct clk_init_data init;
utmi = kzalloc(sizeof(*utmi), GFP_KERNEL);
if (!utmi)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &utmi_ops;
init.parent_names = parent_name ? &parent_name : NULL;
init.num_parents = parent_name ? 1 : 0;
init.flags = CLK_SET_RATE_GATE;
utmi->hw.init = &init;
utmi->pmc = pmc;
utmi->irq = irq;
init_waitqueue_head(&utmi->wait);
irq_set_status_flags(utmi->irq, IRQ_NOAUTOEN);
ret = request_irq(utmi->irq, clk_utmi_irq_handler,
IRQF_TRIGGER_HIGH, "clk-utmi", utmi);
if (ret)
return ERR_PTR(ret);
clk = clk_register(NULL, &utmi->hw);
if (IS_ERR(clk))
kfree(utmi);
return clk;
}
static void __init
of_at91_clk_utmi_setup(struct device_node *np, struct at91_pmc *pmc)
{
unsigned int irq;
struct clk *clk;
const char *parent_name;
const char *name = np->name;
parent_name = of_clk_get_parent_name(np, 0);
of_property_read_string(np, "clock-output-names", &name);
irq = irq_of_parse_and_map(np, 0);
if (!irq)
return;
clk = at91_clk_register_utmi(pmc, irq, name, parent_name);
if (IS_ERR(clk))
return;
of_clk_add_provider(np, of_clk_src_simple_get, clk);
return;
}
void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np,
struct at91_pmc *pmc)
{
of_at91_clk_utmi_setup(np, pmc);
}

View File

@ -292,6 +292,13 @@ static const struct of_device_id pmc_clk_ids[] __initdata = {
.compatible = "atmel,at91sam9x5-clk-programmable",
.data = of_at91sam9x5_clk_prog_setup,
},
#endif
/* UTMI clock */
#if defined(CONFIG_HAVE_AT91_UTMI)
{
.compatible = "atmel,at91sam9x5-clk-utmi",
.data = of_at91sam9x5_clk_utmi_setup,
},
#endif
{ /*sentinel*/ }
};

View File

@ -94,4 +94,9 @@ extern void __init of_at91sam9x5_clk_prog_setup(struct device_node *np,
struct at91_pmc *pmc);
#endif
#if defined(CONFIG_HAVE_AT91_UTMI)
extern void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np,
struct at91_pmc *pmc);
#endif
#endif /* __PMC_H_ */