* Felix Radensky | 2009-01-20 10:02:47 [+0200]:
>Hi,
Hi,
>I'm trying to use utilize ISP1761 USB 2.0 controller on
>a custom platform based on Intel IXP420 CPU (big endian).
>
>I'm using vanilla 2.6.29-rc2, with patches to add generic
>platform device support to ISP160 driver. The ISP1761BE
>is connected 16-bit, the IRQ line is level, active low.
>
>The driver passes scratch register test, but fails in isp1760_run(),
>when calling
>
>handshake(priv, hcd->regs + HC_USBCMD, CMD_RUN, CMD_RUN,
> 250 * 1000);
>
>Below is the relevant output from the driver:
>
>nxp-isp1760 nxp-isp1760: NXP ISP1760 USB Host Controller
>nxp-isp1760 nxp-isp1760: new USB bus registered, assigned bus number 1
>nxp-isp1760 nxp-isp1760: bus width: 16, oc: digital
>nxp-isp1760 nxp-isp1760: irq 25, io mem 0x56000000
>nxp-isp1760 nxp-isp1760: startup error -110
>nxp-isp1760 nxp-isp1760: USB bus 1 deregistered
>nxp-isp1760: probe of nxp-isp1760 failed with error -110
>
>This IXP420 processor is unable to access 16-bit device using native
>readl() and writel(), so I had to implement my own versions and replace
>all uses of readl(), writel(), __raw_readl() and __raw_writel() by custom
>ones, which look like this:
>
>static inline unsigned long ixp4xx_readl(unsigned long addr)
>{
> unsigned long val;
> val = *(unsigned long *)addr;
>
> return (((val & 0xffff) << 16) | ((val & 0xffff0000) >> 16));
>}
>
>static inline void ixp4xx_writel(unsigned long data, unsigned long addr)
>{
> *(unsigned short *)(addr) = (data) & 0xffff;
> *(unsigned short *)(addr + 2) = (data >> 16) & 0xffff;
>}
>
>Any help is solving this problem is much appreciated.
readl() / writel() perform a 32bit access in little endian order on
every arch.
Image data is 0x11223344.
writel would put as
| 0x44 0x33 0x22 0x11
in memory. Your variant would do
| 0x33 0x44 0x11 0x22
and this should be written to the bus unless you swap them for some
reason. Your read seems to do the same swap but doing a 32bit access.
The other people which have the chip wired via a 16bit bus seem to be
happy just to set the ISP1760_FLAG_BUS_WIDTH_16.
Could you try to write 32bit in one go? If this works than you have
probabbly just strange endianess.
>Thanks a lot in advance.
>
>Felix Radensky
>Embedded Solutions Ltd.
Sebastian
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