Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c9b75d132261096ac1170354b9e27837af76a512
Commit:     c9b75d132261096ac1170354b9e27837af76a512
Parent:     93a3ddc201c501146c896d598deb61f3abbe4ab0
Author:     Andrew Victor <[EMAIL PROTECTED]>
AuthorDate: Thu Feb 8 17:36:34 2007 +0100
Committer:  Russell King <[EMAIL PROTECTED]>
CommitDate: Thu Feb 8 20:47:33 2007 +0000

    [ARM] 4154/1: AT91: Clock update
    
    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 <[EMAIL PROTECTED]>
    Signed-off-by: Russell King <[EMAIL PROTECTED]>
---
 arch/arm/mach-at91/clock.c |   62 ++++++++++++++++++++-----------------------
 1 files changed, 29 insertions(+), 33 deletions(-)

diff --git a/arch/arm/mach-at91/clock.c b/arch/arm/mach-at91/clock.c
index 27e7279..f6cb748 100644
--- a/arch/arm/mach-at91/clock.c
+++ b/arch/arm/mach-at91/clock.c
@@ -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;
+}
+
+/*
+ * 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);
+       }
 
-       /* disable all other unused peripheral clocks */
-       at91_periphclk_reset();
+       at91_sys_write(AT91_PMC_PCDR, pcdr);
+       at91_sys_write(AT91_PMC_SCDR, scdr);
 
        return 0;
 }
+late_initcall(at91_clock_reset);
-
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