From 10aebc772a10c95e30dff0779cb0f879b8f1554f Mon Sep 17 00:00:00 2001 From: Ben Dooks Date: Mon, 19 Jul 2010 09:40:44 +0100 Subject: USB: s3c-hsotg: Add initial detection and setup for dedicated FIFO mode Add support for the dedicated FIFO mode on newer SoCs such as the S5PV210 partly to improve support and to fix the bug where any non-EP0 IN endpoint requires its own FIFO allocation. To fix this, we ensure that any non-zero IN endpoint is given a TXFIFO using the same allocation method as the periodic case (all our current hardware has enough FIFOs and FIFO memory for a 1:1 mapping) and ensure that the necessary transmission done interrupt is enabled. The default settings from reset for the core point all EPs at FIFO0, used for the control endpoint. However, the controller documentation states that all IN endpoints _must_ have a unique FIFO to avoid any contention during transmission. Note, this leaves us with a large IN FIFO for EP0 (which re-uses the old NPTXFIFO) for an endpoint which cannot shift more than a pair of packets at a time... this is a waste, but it looks like we cannot re-allocate space to the individual IN FIFOs as they are already maxed out (to be confirmed). Signed-off-by: Ben Dooks Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/s3c-hsotg.c | 40 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 38 insertions(+), 2 deletions(-) (limited to 'drivers/usb') diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c index 9d32c9ff737..4196e376a34 100644 --- a/drivers/usb/gadget/s3c-hsotg.c +++ b/drivers/usb/gadget/s3c-hsotg.c @@ -12,6 +12,8 @@ * published by the Free Software Foundation. */ +#define DEBUG + #include #include #include @@ -130,6 +132,7 @@ struct s3c_hsotg_ep { * @regs: The memory area mapped for accessing registers. * @regs_res: The resource that was allocated when claiming register space. * @irq: The IRQ number we are using + * @dedicated_fifos: Set if the hardware has dedicated IN-EP fifos. * @debug_root: root directrory for debugfs. * @debug_file: main status file for debugfs. * @debug_fifo: FIFO status file for debugfs. @@ -148,6 +151,8 @@ struct s3c_hsotg { struct resource *regs_res; int irq; + unsigned int dedicated_fifos:1; + struct dentry *debug_root; struct dentry *debug_file; struct dentry *debug_fifo; @@ -466,7 +471,7 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg, if (to_write == 0) return 0; - if (periodic) { + if (periodic && !hsotg->dedicated_fifos) { u32 epsize = readl(hsotg->regs + S3C_DIEPTSIZ(hs_ep->index)); int size_left; int size_done; @@ -504,6 +509,11 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg, s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_PTxFEmp); return -ENOSPC; } + } else if (hsotg->dedicated_fifos && hs_ep->index != 0) { + can_write = readl(hsotg->regs + S3C_DTXFSTS(hs_ep->index)); + + can_write &= 0xffff; + can_write *= 4; } else { if (S3C_GNPTXSTS_NPTxQSpcAvail_GET(gnptxsts) == 0) { dev_dbg(hsotg->dev, @@ -1829,6 +1839,15 @@ static void s3c_hsotg_epint(struct s3c_hsotg *hsotg, unsigned int idx, __func__, idx); clear |= S3C_DIEPMSK_INTknEPMisMsk; } + + /* FIFO has space or is empty (see GAHBCFG) */ + if (hsotg->dedicated_fifos && + ints & S3C_DIEPMSK_TxFIFOEmpty) { + dev_dbg(hsotg->dev, "%s: ep%d: TxFIFOEmpty\n", + __func__, idx); + s3c_hsotg_trytx(hsotg, hs_ep); + clear |= S3C_DIEPMSK_TxFIFOEmpty; + } } writel(clear, hsotg->regs + epint_reg); @@ -2280,6 +2299,12 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep, break; } + /* if the hardware has dedicated fifos, we must give each IN EP + * a unique tx-fifo even if it is non-periodic. + */ + if (dir_in && hsotg->dedicated_fifos) + epctrl |= S3C_DxEPCTL_TxFNum(index); + /* for non control endpoints, set PID to D0 */ if (index) epctrl |= S3C_DxEPCTL_SetD0PID; @@ -2569,7 +2594,8 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver) writel(S3C_DIEPMSK_TimeOUTMsk | S3C_DIEPMSK_AHBErrMsk | S3C_DIEPMSK_INTknEPMisMsk | - S3C_DIEPMSK_EPDisbldMsk | S3C_DIEPMSK_XferComplMsk, + S3C_DIEPMSK_EPDisbldMsk | S3C_DIEPMSK_XferComplMsk | + ((hsotg->dedicated_fifos) ? S3C_DIEPMSK_TxFIFOEmpty : 0), hsotg->regs + S3C_DIEPMSK); /* don't need XferCompl, we get that from RXFIFO in slave mode. In @@ -2778,6 +2804,8 @@ static void s3c_hsotg_otgreset(struct s3c_hsotg *hsotg) static void s3c_hsotg_init(struct s3c_hsotg *hsotg) { + u32 cfg4; + /* unmask subset of endpoint interrupts */ writel(S3C_DIEPMSK_TimeOUTMsk | S3C_DIEPMSK_AHBErrMsk | @@ -2813,6 +2841,14 @@ static void s3c_hsotg_init(struct s3c_hsotg *hsotg) writel(using_dma(hsotg) ? S3C_GAHBCFG_DMAEn : 0x0, hsotg->regs + S3C_GAHBCFG); + + /* check hardware configuration */ + + cfg4 = readl(hsotg->regs + 0x50); + hsotg->dedicated_fifos = (cfg4 >> 25) & 1; + + dev_info(hsotg->dev, "%s fifos\n", + hsotg->dedicated_fifos ? "dedicated" : "shared"); } static void s3c_hsotg_dump(struct s3c_hsotg *hsotg) -- cgit v1.2.3-70-g09d2