diff options
| author | Ben Dooks <ben-linux@fluff.org> | 2010-05-25 08:36:50 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-06-05 00:16:19 +0400 |
| commit | 0f002d200598918f5058dfcfda3da46f29019765 (patch) | |
| tree | 734136aaeb72c3e0094dfa9078ad9976c3215e4f /drivers/usb/gadget | |
| parent | 0287e43dda1a425da662f879dd27352021b0ca63 (diff) | |
| download | linux-0f002d200598918f5058dfcfda3da46f29019765.tar.xz | |
USB: s3c-hsotg: Ensure TX FIFO addresses setup when initialising FIFOs
Some versions of the S3C HS OtG block startup with overlapping TX FIFO
information, so change the fifo_init code to ensure that known values
are set into the FIFO registers at initialisation/reset time.
This also ensures that the FIFO RAM pointers are in a known state
before use.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget')
| -rw-r--r-- | drivers/usb/gadget/s3c-hsotg.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c index a6d725dd7335..9abf96c5715d 100644 --- a/drivers/usb/gadget/s3c-hsotg.c +++ b/drivers/usb/gadget/s3c-hsotg.c @@ -297,6 +297,11 @@ static void s3c_hsotg_ctrl_epint(struct s3c_hsotg *hsotg, */ static void s3c_hsotg_init_fifo(struct s3c_hsotg *hsotg) { + unsigned int ep; + unsigned int addr; + unsigned int size; + u32 val; + /* the ryu 2.6.24 release ahs writel(0x1C0, hsotg->regs + S3C_GRXFSIZ); writel(S3C_GNPTXFSIZ_NPTxFStAddr(0x200) | @@ -310,6 +315,26 @@ static void s3c_hsotg_init_fifo(struct s3c_hsotg *hsotg) writel(S3C_GNPTXFSIZ_NPTxFStAddr(2048) | S3C_GNPTXFSIZ_NPTxFDep(0x1C0), hsotg->regs + S3C_GNPTXFSIZ); + + /* arange all the rest of the TX FIFOs, as some versions of this + * block have overlapping default addresses. This also ensures + * that if the settings have been changed, then they are set to + * known values. */ + + /* start at the end of the GNPTXFSIZ, rounded up */ + addr = 2048 + 1024; + size = 768; + + /* currently we allocate TX FIFOs for all possible endpoints, + * and assume that they are all the same size. */ + + for (ep = 0; ep <= 15; ep++) { + val = addr; + val |= size << S3C_DPTXFSIZn_DPTxFSize_SHIFT; + addr += size; + + writel(val, hsotg->regs + S3C_DPTXFSIZn(ep)); + } } /** |