From 527ea73eaea4600120117edd19ac88864a488d57 Mon Sep 17 00:00:00 2001 From: Kyungmin Park Date: Wed, 21 Nov 2007 15:13:15 -0800 Subject: [PATCH] USB: device DMA support on OMAP2 The current omap udc dosen't support the DMA mode and it has some problem at setup time on OMAP2 with previous patch file. I found that the code assumes bulk out required the big data transfer. But MODE SELECT(6) sent the only 24 bytes. it makes a problem. So I implement the small packets handling for it. It is tested with both linux and windows. Signed-off-by: Kyungmin Park Cc: David Brownell Cc: Tony Lindgren Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/omap_udc.c | 71 ++++++++++++++++++++++++----------- 1 file changed, 49 insertions(+), 22 deletions(-) diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c index d377154658b..7d6bef56cb0 100644 --- a/drivers/usb/gadget/omap_udc.c +++ b/drivers/usb/gadget/omap_udc.c @@ -4,6 +4,8 @@ * Copyright (C) 2004 Texas Instruments, Inc. * Copyright (C) 2004-2005 David Brownell * + * OMAP2 & DMA support by Kyungmin Park + * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or @@ -60,11 +62,6 @@ /* bulk DMA seems to be behaving for both IN and OUT */ #define USE_DMA -/* FIXME: OMAP2 currently has some problem in DMA mode */ -#ifdef CONFIG_ARCH_OMAP2 -#undef USE_DMA -#endif - /* ISO too */ #define USE_ISO @@ -73,6 +70,8 @@ #define DMA_ADDR_INVALID (~(dma_addr_t)0) +#define OMAP2_DMA_CH(ch) (((ch) - 1) << 1) +#define OMAP24XX_DMA(name, ch) (OMAP24XX_DMA_##name + OMAP2_DMA_CH(ch)) /* * The OMAP UDC needs _very_ early endpoint setup: before enabling the @@ -571,20 +570,25 @@ static void next_in_dma(struct omap_ep *ep, struct omap_req *req) const int sync_mode = cpu_is_omap15xx() ? OMAP_DMA_SYNC_FRAME : OMAP_DMA_SYNC_ELEMENT; + int dma_trigger = 0; + + if (cpu_is_omap24xx()) + dma_trigger = OMAP24XX_DMA(USB_W2FC_TX0, ep->dma_channel); /* measure length in either bytes or packets */ if ((cpu_is_omap16xx() && length <= UDC_TXN_TSC) + || (cpu_is_omap24xx() && length < ep->maxpacket) || (cpu_is_omap15xx() && length < ep->maxpacket)) { txdma_ctrl = UDC_TXN_EOT | length; omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8, - length, 1, sync_mode, 0, 0); + length, 1, sync_mode, dma_trigger, 0); } else { length = min(length / ep->maxpacket, (unsigned) UDC_TXN_TSC + 1); txdma_ctrl = length; omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16, ep->ep.maxpacket >> 1, length, sync_mode, - 0, 0); + dma_trigger, 0); length *= ep->maxpacket; } omap_set_dma_src_params(ep->lch, OMAP_DMA_PORT_EMIFF, @@ -622,20 +626,31 @@ static void finish_in_dma(struct omap_ep *ep, struct omap_req *req, int status) static void next_out_dma(struct omap_ep *ep, struct omap_req *req) { - unsigned packets; + unsigned packets = req->req.length - req->req.actual; + int dma_trigger = 0; + + if (cpu_is_omap24xx()) + dma_trigger = OMAP24XX_DMA(USB_W2FC_RX0, ep->dma_channel); /* NOTE: we filtered out "short reads" before, so we know * the buffer has only whole numbers of packets. + * except MODE SELECT(6) sent the 24 bytes data in OMAP24XX DMA mode */ - - /* set up this DMA transfer, enable the fifo, start */ - packets = (req->req.length - req->req.actual) / ep->ep.maxpacket; - packets = min(packets, (unsigned)UDC_RXN_TC + 1); - req->dma_bytes = packets * ep->ep.maxpacket; - omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16, - ep->ep.maxpacket >> 1, packets, - OMAP_DMA_SYNC_ELEMENT, - 0, 0); + if (cpu_is_omap24xx() && packets < ep->maxpacket) { + omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8, + packets, 1, OMAP_DMA_SYNC_ELEMENT, + dma_trigger, 0); + req->dma_bytes = packets; + } else { + /* set up this DMA transfer, enable the fifo, start */ + packets /= ep->ep.maxpacket; + packets = min(packets, (unsigned)UDC_RXN_TC + 1); + req->dma_bytes = packets * ep->ep.maxpacket; + omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16, + ep->ep.maxpacket >> 1, packets, + OMAP_DMA_SYNC_ELEMENT, + dma_trigger, 0); + } omap_set_dma_dest_params(ep->lch, OMAP_DMA_PORT_EMIFF, OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual, 0, 0); @@ -743,6 +758,7 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel) { u16 reg; int status, restart, is_in; + int dma_channel; is_in = ep->bEndpointAddress & USB_DIR_IN; if (is_in) @@ -769,11 +785,15 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel) ep->dma_channel = channel; if (is_in) { - status = omap_request_dma(OMAP_DMA_USB_W2FC_TX0 - 1 + channel, + if (cpu_is_omap24xx()) + dma_channel = OMAP24XX_DMA(USB_W2FC_TX0, channel); + else + dma_channel = OMAP_DMA_USB_W2FC_TX0 - 1 + channel; + status = omap_request_dma(dma_channel, ep->ep.name, dma_error, ep, &ep->lch); if (status == 0) { UDC_TXDMA_CFG_REG = reg; - /* EMIFF */ + /* EMIFF or SDRC */ omap_set_dma_src_burst_mode(ep->lch, OMAP_DMA_DATA_BURST_4); omap_set_dma_src_data_pack(ep->lch, 1); @@ -785,7 +805,12 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel) 0, 0); } } else { - status = omap_request_dma(OMAP_DMA_USB_W2FC_RX0 - 1 + channel, + if (cpu_is_omap24xx()) + dma_channel = OMAP24XX_DMA(USB_W2FC_RX0, channel); + else + dma_channel = OMAP_DMA_USB_W2FC_RX0 - 1 + channel; + + status = omap_request_dma(dma_channel, ep->ep.name, dma_error, ep, &ep->lch); if (status == 0) { UDC_RXDMA_CFG_REG = reg; @@ -795,7 +820,7 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel) OMAP_DMA_AMODE_CONSTANT, (unsigned long) io_v2p((u32)&UDC_DATA_DMA_REG), 0, 0); - /* EMIFF */ + /* EMIFF or SDRC */ omap_set_dma_dest_burst_mode(ep->lch, OMAP_DMA_DATA_BURST_4); omap_set_dma_dest_data_pack(ep->lch, 1); @@ -808,7 +833,7 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel) omap_disable_dma_irq(ep->lch, OMAP_DMA_BLOCK_IRQ); /* channel type P: hw synch (fifo) */ - if (!cpu_is_omap15xx()) + if (cpu_class_is_omap1() && !cpu_is_omap15xx()) OMAP1_DMA_LCH_CTRL_REG(ep->lch) = 2; } @@ -926,11 +951,13 @@ omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) /* this isn't bogus, but OMAP DMA isn't the only hardware to * have a hard time with partial packet reads... reject it. + * Except OMAP2 can handle the small packets. */ if (use_dma && ep->has_dma && ep->bEndpointAddress != 0 && (ep->bEndpointAddress & USB_DIR_IN) == 0 + && !cpu_class_is_omap2() && (req->req.length % ep->ep.maxpacket) != 0) { DBG("%s, no partial packet OUT reads\n", __FUNCTION__); return -EMSGSIZE; -- 2.41.1