2009/7/21 Roger Quadros <ext-roger.quadros@xxxxxxxxx>:
> ext matthias schwarz wrote:
>>
>> Hello there,
>>
>> i just wrote a little kernel-module, which only executes the following
>> lines of code:
>>
>> u32 syn_mode;
>> void* iomem;
>> struct resource* resource_ptr;
>>
>> resource_ptr = request_mem_region(0x480BC000, 0xFFF, "isp_ccdc");
>>
>> iomem = ioremap(OMAP3ISP_REG(ISP_SYSCONFIG), 8);
>> if(iomem == NULL) {
>> printk("ioremap returned zero\n");
>> return 0;
>> }
>> syn_mode = ioread32(iomem);
>>
>>
>>
>> The resulting behaviour does not depend on which ISP register i am
>> trying to read, it also happens for "OMAP3ISP_CCDC_REG_BASE +
>> ISPCCDC_SYN_MODE" for example. And also when using
>> "omap_readl(address)" to read those registers.
>>
>> So when this code is executed i get:
>>
>> Unhandled fault: external abort on non-linefetch (0x1028) at 0xd80bc004
>> Internal error: : 1028 [#1] PREEMPT
>> Internal error: : 1028 [#1] PREEMPT
>> Modules linked in:Modules linked in: camera(+) camera(+) ipv6 ipv6
>>
>> CPU: 0 Not tainted (2.6.28-omap1 #15)
>> [...]
>>
>>
>> Hope someone can help me with what might be wrong.
>> Thank you,
>> Matthias
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>>
>
> You need to enable interface clocks before accessing any peripheral
> registers.
>
> regards,
> -roger
struct device_driver camera_drv = {
.name = "camera"
};
struct device camera_dev = {
.driver = &camera_drv,
};
[...]
struct clk* clock;
clock = clk_get(&camera_dev, "cam_ick");
clk_enable(clock);
[...]
so this would be it, wouldn't it?
Thank you very much,
Matthias
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