[U-Boot] [PATCH 09/12] microblaze: timer: Add device-tree driver configuration
Michal Simek
monstr at monstr.eu
Tue Jul 10 11:23:30 CEST 2012
On 07/09/2012 11:32 PM, Simon Glass wrote:
> Hi Michal,
>
> On Mon, Jul 9, 2012 at 2:20 AM, Michal Simek <monstr at monstr.eu <mailto:monstr at monstr.eu>> wrote:
>
> Read configuration from DTB.
>
> Signed-off-by: Michal Simek <monstr at monstr.eu <mailto:monstr at monstr.eu>>
> ---
> arch/microblaze/cpu/timer.c | 25 +++++++++++++++++++++++++
> 1 files changed, 25 insertions(+), 0 deletions(-)
>
> diff --git a/arch/microblaze/cpu/timer.c b/arch/microblaze/cpu/timer.c
> index dfaaaf5..91ca42b 100644
> --- a/arch/microblaze/cpu/timer.c
> +++ b/arch/microblaze/cpu/timer.c
> @@ -25,6 +25,9 @@
> #include <common.h>
> #include <asm/microblaze_timer.h>
> #include <asm/microblaze_intc.h>
> +#include <fdtdec.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
>
> volatile int timestamp = 0;
> microblaze_timer_t *tmr;
> @@ -62,11 +65,33 @@ int timer_init (void)
> u32 preload = 0;
> u32 ret = 0;
>
> +#ifndef CONFIG_OF_CONTROL
>
>
> Maybe make this #ifdef and put the fdt code first?
I see only one reason to do it (and that's why I have done it in intc code too)
which is debug purpose. Because you can simple comment ifdefs and hardcoded values
below fdt code which you can debug.
>
> #if defined(CONFIG_SYS_TIMER_0_ADDR) && defined(CONFIG_SYS_INTC_0_NUM)
> preload = XILINX_CLOCK_FREQ / CONFIG_SYS_HZ;
> irq = CONFIG_SYS_TIMER_0_IRQ;
> tmr = (microblaze_timer_t *) (CONFIG_SYS_TIMER_0_ADDR);
> #endif
> +#else
> + int temp;
> + int offset = 0;
>
>
> Can remove =0 I think.
done.
>
> +
> + offset = fdt_node_offset_by_compatible(gd->fdt_blob, offset,
> + "xlnx,xps-timer-1.00.a");
> + if (offset > 0) {
> + temp = fdtdec_get_addr(gd->fdt_blob, offset, "reg");
> + if (temp != FDT_ADDR_T_NONE) {
> + tmr = (microblaze_timer_t *)temp;
> + irq = fdtdec_get_int(gd->fdt_blob, offset,
> + "interrupts", -1);
> + if (irq == -1)
> + panic("Connect IRQ to system timer\n");
>
>
> That's a little cryptic - maybe should mention fdt?
What about this?
panic("Timer IRQ is not found in DTS/DTB\n");
I don't want to write there novels but this is also checked in different tool
which generates DTS that's why simple panic should be eliminated for most cases.
Thanks,
Michal
--
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian
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