On Tue, 2005-06-28 at 00:27 -0500, Bill Gatliff wrote:
> I'm still not getting the chip to recognize a device when I connect one,
> even though I have corrected a number of things that I think were wrong
> in my platform code. Any suggestions would be appreciated.
I can't tell you what the problem is but I can show you what works on my
PXA255 platform. I'm not sure the delay stuff is still needed or what,
but it works.
/* From Headers */
#define VIPER_USB_IRQ IRQ_GPIO(2)
#define VIPER_USB_PHYS PXA_CS3_PHYS
/* USB */
static void isp116x_delay(struct device *dev, int delay)
{
/* On this platform, we work with 200MHz clock, giving
5 ns per instruction. The cycle below involves 2
instructions and we lose 2 more instruction times due
to pipeline flush at a jump. I.e., we consume 20 ns
per cycle.
*/
int cyc = delay/20 + 1;
cyc <<= 2; /* actually, 400MHz */
__asm__ volatile ("0:\n"
" subs %0, %1, #1\n"
" bge 0b\n"
: "=r" (cyc)
: "0" (cyc)
);
}
static struct resource isp116x_resources[] = {
[0] = { /* DATA */
.start = VIPER_USB_PHYS + 0,
.end = VIPER_USB_PHYS + 1,
.flags = IORESOURCE_MEM,
},
[1] = { /* ADDR */
.start = VIPER_USB_PHYS + 2,
.end = VIPER_USB_PHYS + 3,
.flags = IORESOURCE_MEM,
},
[2] = {
.start = VIPER_USB_IRQ,
.end = VIPER_USB_IRQ,
.flags = IORESOURCE_IRQ,
},
};
// (DataBusWidth16|AnalogOCEnable|DREQOutputPolarity|DownstreamPort15KRSel )
static struct isp116x_platform_data isp116x_platform_data = {
// Enable internal resistors on downstream ports
.sel15Kres = 1,
// Clock cannot be stopped
.clknotstop = 0,
// On-chip overcurrent protection
.oc_enable = 1,
// INT output polarity
.int_act_high = 1,
// INT edge or level triggered
.int_edge_triggered = 0,
// End-of-transfer input polarity
.eot_act_high = 0,
// DREQ output polarity
.dreq_act_high = 1,
// WAKEUP pin connected
.remote_wakeup_connected= 0,
// Wakeup by devices on usb bus enabled
.remote_wakeup_enable = 0,
// Switch or not to switch (keep always powered)
.no_power_switching = 1,
// Ganged port power switching (0) or individual port power switching
(1)
.power_switching_mode = 0,
.reset = NULL,
.delay = isp116x_delay,
};
static struct platform_device isp116x_device = {
.name = "isp116x-hcd",
.id = -1,
.num_resources = ARRAY_SIZE(isp116x_resources),
.resource = isp116x_resources,
.dev = {
.platform_data = &isp116x_platform_data,
},
};
--
Ian Campbell
Current Noise: The Hidden Hand - Desensitized
"I will make no bargains with terrorist hardware."
-- Peter da Silva
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