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clk: at91: pmc: Support backup for programmable clocks 

When an AT91 programmable clock is declared in the device tree, register
it into the Power Management Controller driver. On entering suspend mode,
the driver saves and restores the Programmable Clock registers to support
the backup mode for these clocks.

Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
hifive-unleashed-5.1
Romain Izard 2017-12-11 17:55:35 +01:00 committed by Stephen Boyd
parent 3c6fad2593
commit 13967bea0b
3 changed files with 39 additions and 0 deletions
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2
drivers/clk/at91/clk-programmable.c
View File

@ -204,6 +204,8 @@ at91_clk_register_programmable(struct regmap *regmap,
if (ret) {
kfree(prog);
hw = ERR_PTR(ret);
} else {
pmc_register_pck(id);
}
return hw;

35
drivers/clk/at91/pmc.c
View File

@ -22,6 +22,7 @@
#include "pmc.h"
#define PMC_MAX_IDS 128
#define PMC_MAX_PCKS 8
int of_at91_get_clk_range(struct device_node *np, const char *propname,
struct clk_range *range)
@ -50,6 +51,7 @@ EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
static struct regmap *pmcreg;
static u8 registered_ids[PMC_MAX_IDS];
static u8 registered_pcks[PMC_MAX_PCKS];
static struct
{
@ -66,8 +68,13 @@ static struct
u32 pcr[PMC_MAX_IDS];
u32 audio_pll0;
u32 audio_pll1;
u32 pckr[PMC_MAX_PCKS];
} pmc_cache;
/*
* As Peripheral ID 0 is invalid on AT91 chips, the identifier is stored
* without alteration in the table, and 0 is for unused clocks.
*/
void pmc_register_id(u8 id)
{
int i;
@ -82,9 +89,28 @@ void pmc_register_id(u8 id)
}
}
/*
* As Programmable Clock 0 is valid on AT91 chips, there is an offset
* of 1 between the stored value and the real clock ID.
*/
void pmc_register_pck(u8 pck)
{
int i;
for (i = 0; i < PMC_MAX_PCKS; i++) {
if (registered_pcks[i] == 0) {
registered_pcks[i] = pck + 1;
break;
}
if (registered_pcks[i] == (pck + 1))
break;
}
}
static int pmc_suspend(void)
{
int i;
u8 num;
regmap_read(pmcreg, AT91_PMC_SCSR, &pmc_cache.scsr);
regmap_read(pmcreg, AT91_PMC_PCSR, &pmc_cache.pcsr0);
@ -103,6 +129,10 @@ static int pmc_suspend(void)
regmap_read(pmcreg, AT91_PMC_PCR,
&pmc_cache.pcr[registered_ids[i]]);
}
for (i = 0; registered_pcks[i]; i++) {
num = registered_pcks[i] - 1;
regmap_read(pmcreg, AT91_PMC_PCKR(num), &pmc_cache.pckr[num]);
}
return 0;
}
@ -119,6 +149,7 @@ static bool pmc_ready(unsigned int mask)
static void pmc_resume(void)
{
int i;
u8 num;
u32 tmp;
u32 mask = AT91_PMC_MCKRDY | AT91_PMC_LOCKA;
@ -143,6 +174,10 @@ static void pmc_resume(void)
pmc_cache.pcr[registered_ids[i]] |
AT91_PMC_PCR_CMD);
}
for (i = 0; registered_pcks[i]; i++) {
num = registered_pcks[i] - 1;
regmap_write(pmcreg, AT91_PMC_PCKR(num), pmc_cache.pckr[num]);
}
if (pmc_cache.uckr & AT91_PMC_UPLLEN)
mask |= AT91_PMC_LOCKU;

2
drivers/clk/at91/pmc.h
View File

@ -31,8 +31,10 @@ int of_at91_get_clk_range(struct device_node *np, const char *propname,
#ifdef CONFIG_PM
void pmc_register_id(u8 id);
void pmc_register_pck(u8 pck);
#else
static inline void pmc_register_id(u8 id) {}
static inline void pmc_register_pck(u8 pck) {}
#endif
#endif /* __PMC_H_ */