korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-16 08:44:21 +08:00
Code Issues Packages Projects Releases Wiki Activity

[ARM] 4154/1: AT91: Clock update

Browse Source 
Unconditionally disabling the PCKs (Programmable Clocks) is not a good
idea as it breaks boards that depend on those clocks being enabled by
bootloaders.
Therefore only disable unused clocks late in the init process, giving
the board init code the chance to claim the clock.

Patch from Steven Scholz.

Since the HCK clocks on SAM9261 are already being registered as a
independent clocks, we don't need the special case for HCK0 on the
SAM9261.  Platform-init code and drivers should use the clock API to
enable/disable the clock.

Patch from Nicolas Ferre.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Andrew Victor 2007-02-08 17:36:34 +01:00 committed by Russell King
parent 93a3ddc201
commit c9b75d1322
1 changed files with 29 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
arch/arm/mach-at91/clock.c
View File

@ -525,27 +525,6 @@ fail:
return 0;
}
/*
* Several unused clocks may be active. Turn them off.
*/
static void __init at91_periphclk_reset(void)
{
unsigned long reg;
struct clk *clk;
reg = at91_sys_read(AT91_PMC_PCSR);
list_for_each_entry(clk, &clocks, node) {
if (clk->mode != pmc_periph_mode)
continue;
if (clk->users > 0)
reg &= ~clk->pmc_mask;
}
at91_sys_write(AT91_PMC_PCDR, reg);
}
static struct clk *const standard_pmc_clocks[] __initdata = {
/* four primary clocks */
&clk32k,
@ -586,7 +565,7 @@ int __init at91_clock_init(unsigned long main_clock)
pr_info("Clocks: PLLA overclocked, %ld MHz\n", plla.rate_hz / 1000000);
/*
* USB clock init: choose 48 MHz PLLB value, turn all clocks off,
* USB clock init: choose 48 MHz PLLB value,
* disable 48MHz clock during usb peripheral suspend.
*
* REVISIT: assumes MCK doesn't derive from PLLB!
@ -596,16 +575,10 @@ int __init at91_clock_init(unsigned long main_clock)
if (cpu_is_at91rm9200()) {
uhpck.pmc_mask = AT91RM9200_PMC_UHP;
udpck.pmc_mask = AT91RM9200_PMC_UDP;
at91_sys_write(AT91_PMC_SCDR, AT91RM9200_PMC_UHP | AT91RM9200_PMC_UDP);
at91_sys_write(AT91_PMC_SCER, AT91RM9200_PMC_MCKUDP);
} else if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) {
} else if (cpu_is_at91sam9260() || cpu_is_at91sam9261() || cpu_is_at91sam9263()) {
uhpck.pmc_mask = AT91SAM926x_PMC_UHP;
udpck.pmc_mask = AT91SAM926x_PMC_UDP;
at91_sys_write(AT91_PMC_SCDR, AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP);
} else if (cpu_is_at91sam9261()) {
uhpck.pmc_mask = (AT91SAM926x_PMC_UHP | AT91_PMC_HCK0);
udpck.pmc_mask = AT91SAM926x_PMC_UDP;
at91_sys_write(AT91_PMC_SCDR, AT91SAM926x_PMC_UHP | AT91_PMC_HCK0 | AT91SAM926x_PMC_UDP);
}
at91_sys_write(AT91_CKGR_PLLBR, 0);
@ -634,11 +607,34 @@ int __init at91_clock_init(unsigned long main_clock)
(unsigned) main_clock / 1000000,
((unsigned) main_clock % 1000000) / 1000);
/* disable all programmable clocks */
at91_sys_write(AT91_PMC_SCDR, AT91_PMC_PCK0 | AT91_PMC_PCK1 | AT91_PMC_PCK2 | AT91_PMC_PCK3);
return 0;
}
/* disable all other unused peripheral clocks */
at91_periphclk_reset();
/*
* Several unused clocks may be active. Turn them off.
*/
static int __init at91_clock_reset(void)
{
unsigned long pcdr = 0;
unsigned long scdr = 0;
struct clk *clk;
list_for_each_entry(clk, &clocks, node) {
if (clk->users > 0)
continue;
if (clk->mode == pmc_periph_mode)
pcdr |= clk->pmc_mask;
if (clk->mode == pmc_sys_mode)
scdr |= clk->pmc_mask;
pr_debug("Clocks: disable unused %s\n", clk->name);
}
at91_sys_write(AT91_PMC_PCDR, pcdr);
at91_sys_write(AT91_PMC_SCDR, scdr);
return 0;
}
late_initcall(at91_clock_reset);