avr32: Generic clockevents support

This combines three patches from David Brownell:
  * avr32: tclib support
  * avr32: simplify clocksources
  * avr32: Turn count/compare into a oneshot clockevent device

Register both TC blocks (instead of just the first one) so that
the AT32/AT91 tclib code will pick them up (instead of just the
avr32-only PIT-style clocksource).

Rename the first one and its resources appropriately.

More cleanups to the cycle counter clocksource code

 - Disable all the weak symbol magic; remove the AVR32-only TCB-based
   clocksource code (source and header).

 - Mark the __init code properly.

 - Don't forget to report IRQF_TIMER.

 - Make the system work properly with this clocksource, by preventing
   use of the CPU "idle" sleep state in the idle loop when it's used.

Package the avr32 count/compare timekeeping support as a oneshot
clockevent device, so it supports NO_HZ and high res timers.
This means it also supports plugging in other clockevent devices
and clocksources.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

1 files changed, 24 insertions, 9 deletions

diff --git a/arch/avr32/mach-at32ap/at32ap700x.c b/arch/avr32/mach-at32ap/at32ap700x.c
index 6302bfd58514..22c302ad9b3f 100644
--- a/arch/avr32/mach-at32ap/at32ap700x.c
+++ b/arch/avr32/mach-at32ap/at32ap700x.c
@@ -606,19 +606,32 @@ static inline void set_ebi_sfr_bits(u32 mask)
 }
 
 /* --------------------------------------------------------------------
- *  System Timer/Counter (TC)
+ *  Timer/Counter (TC)
  * -------------------------------------------------------------------- */
-static struct resource at32_systc0_resource[] = {
+
+static struct resource at32_tcb0_resource[] = {
         PBMEM(0xfff00c00),
         IRQ(22),
 };
-struct platform_device at32_systc0_device = {
-        .name           = "systc",
+static struct platform_device at32_tcb0_device = {
+        .name           = "atmel_tcb",
         .id             = 0,
-        .resource       = at32_systc0_resource,
-        .num_resources  = ARRAY_SIZE(at32_systc0_resource),
+        .resource       = at32_tcb0_resource,
+        .num_resources  = ARRAY_SIZE(at32_tcb0_resource),
+};
+DEV_CLK(t0_clk, at32_tcb0, pbb, 3);
+
+static struct resource at32_tcb1_resource[] = {
+        PBMEM(0xfff01000),
+        IRQ(23),
+};
+static struct platform_device at32_tcb1_device = {
+        .name           = "atmel_tcb",
+        .id             = 1,
+        .resource       = at32_tcb1_resource,
+        .num_resources  = ARRAY_SIZE(at32_tcb1_resource),
 };
-DEV_CLK(pclk, at32_systc0, pbb, 3);
+DEV_CLK(t0_clk, at32_tcb1, pbb, 4);
 
 /* --------------------------------------------------------------------
  *  PIO
@@ -670,7 +683,8 @@ void __init at32_add_system_devices(void)
         platform_device_register(&pdc_device);
         platform_device_register(&dmaca0_device);
 
-        platform_device_register(&at32_systc0_device);
+        platform_device_register(&at32_tcb0_device);
+        platform_device_register(&at32_tcb1_device);
 
         platform_device_register(&pio0_device);
         platform_device_register(&pio1_device);
@@ -1737,7 +1751,8 @@ struct clk *at32_clock_list[] = {
         &pio2_mck,
         &pio3_mck,
         &pio4_mck,
-        &at32_systc0_pclk,
+        &at32_tcb0_t0_clk,
+        &at32_tcb1_t0_clk,
         &atmel_usart0_usart,
         &atmel_usart1_usart,
         &atmel_usart2_usart,