Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

1 files changed, 433 insertions, 0 deletions

diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
new file mode 100644
index 000000000000..9ba8fb7fcd24
--- /dev/null
+++ b/drivers/usb/musb/musbhsdma.c
@@ -0,0 +1,433 @@
+/*
+ * MUSB OTG driver - support for Mentor's DMA controller
+ *
+ * Copyright 2005 Mentor Graphics Corporation
+ * Copyright (C) 2005-2007 by Texas Instruments
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
+ * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include "musb_core.h"
+
+#if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP3430)
+#include "omap2430.h"
+#endif
+
+#define MUSB_HSDMA_BASE		0x200
+#define MUSB_HSDMA_INTR		(MUSB_HSDMA_BASE + 0)
+#define MUSB_HSDMA_CONTROL		0x4
+#define MUSB_HSDMA_ADDRESS		0x8
+#define MUSB_HSDMA_COUNT		0xc
+
+#define MUSB_HSDMA_CHANNEL_OFFSET(_bChannel, _offset)		\
+		(MUSB_HSDMA_BASE + (_bChannel << 4) + _offset)
+
+/* control register (16-bit): */
+#define MUSB_HSDMA_ENABLE_SHIFT		0
+#define MUSB_HSDMA_TRANSMIT_SHIFT		1
+#define MUSB_HSDMA_MODE1_SHIFT		2
+#define MUSB_HSDMA_IRQENABLE_SHIFT		3
+#define MUSB_HSDMA_ENDPOINT_SHIFT		4
+#define MUSB_HSDMA_BUSERROR_SHIFT		8
+#define MUSB_HSDMA_BURSTMODE_SHIFT		9
+#define MUSB_HSDMA_BURSTMODE		(3 << MUSB_HSDMA_BURSTMODE_SHIFT)
+#define MUSB_HSDMA_BURSTMODE_UNSPEC	0
+#define MUSB_HSDMA_BURSTMODE_INCR4	1
+#define MUSB_HSDMA_BURSTMODE_INCR8	2
+#define MUSB_HSDMA_BURSTMODE_INCR16	3
+
+#define MUSB_HSDMA_CHANNELS		8
+
+struct musb_dma_controller;
+
+struct musb_dma_channel {
+	struct dma_channel		Channel;
+	struct musb_dma_controller	*controller;
+	u32				dwStartAddress;
+	u32				len;
+	u16				wMaxPacketSize;
+	u8				bIndex;
+	u8				epnum;
+	u8				transmit;
+};
+
+struct musb_dma_controller {
+	struct dma_controller		Controller;
+	struct musb_dma_channel		aChannel[MUSB_HSDMA_CHANNELS];
+	void				*pDmaPrivate;
+	void __iomem			*pCoreBase;
+	u8				bChannelCount;
+	u8				bmUsedChannels;
+	u8				irq;
+};
+
+static int dma_controller_start(struct dma_controller *c)
+{
+	/* nothing to do */
+	return 0;
+}
+
+static void dma_channel_release(struct dma_channel *pChannel);
+
+static int dma_controller_stop(struct dma_controller *c)
+{
+	struct musb_dma_controller *controller =
+		container_of(c, struct musb_dma_controller, Controller);
+	struct musb *musb = (struct musb *) controller->pDmaPrivate;
+	struct dma_channel *pChannel;
+	u8 bBit;
+
+	if (controller->bmUsedChannels != 0) {
+		dev_err(musb->controller,
+			"Stopping DMA controller while channel active\n");
+
+		for (bBit = 0; bBit < MUSB_HSDMA_CHANNELS; bBit++) {
+			if (controller->bmUsedChannels & (1 << bBit)) {
+				pChannel = &controller->aChannel[bBit].Channel;
+				dma_channel_release(pChannel);
+
+				if (!controller->bmUsedChannels)
+					break;
+			}
+		}
+	}
+	return 0;
+}
+
+static struct dma_channel *dma_channel_allocate(struct dma_controller *c,
+				struct musb_hw_ep *hw_ep, u8 transmit)
+{
+	u8 bBit;
+	struct dma_channel *pChannel = NULL;
+	struct musb_dma_channel *pImplChannel = NULL;
+	struct musb_dma_controller *controller =
+			container_of(c, struct musb_dma_controller, Controller);
+
+	for (bBit = 0; bBit < MUSB_HSDMA_CHANNELS; bBit++) {
+		if (!(controller->bmUsedChannels & (1 << bBit))) {
+			controller->bmUsedChannels |= (1 << bBit);
+			pImplChannel = &(controller->aChannel[bBit]);
+			pImplChannel->controller = controller;
+			pImplChannel->bIndex = bBit;
+			pImplChannel->epnum = hw_ep->epnum;
+			pImplChannel->transmit = transmit;
+			pChannel = &(pImplChannel->Channel);
+			pChannel->private_data = pImplChannel;
+			pChannel->status = MUSB_DMA_STATUS_FREE;
+			pChannel->max_len = 0x10000;
+			/* Tx => mode 1; Rx => mode 0 */
+			pChannel->desired_mode = transmit;
+			pChannel->actual_len = 0;
+			break;
+		}
+	}
+	return pChannel;
+}
+
+static void dma_channel_release(struct dma_channel *pChannel)
+{
+	struct musb_dma_channel *pImplChannel =
+		(struct musb_dma_channel *) pChannel->private_data;
+
+	pChannel->actual_len = 0;
+	pImplChannel->dwStartAddress = 0;
+	pImplChannel->len = 0;
+
+	pImplChannel->controller->bmUsedChannels &=
+		~(1 << pImplChannel->bIndex);
+
+	pChannel->status = MUSB_DMA_STATUS_UNKNOWN;
+}
+
+static void configure_channel(struct dma_channel *pChannel,
+				u16 packet_sz, u8 mode,
+				dma_addr_t dma_addr, u32 len)
+{
+	struct musb_dma_channel *pImplChannel =
+		(struct musb_dma_channel *) pChannel->private_data;
+	struct musb_dma_controller *controller = pImplChannel->controller;
+	void __iomem *mbase = controller->pCoreBase;
+	u8 bChannel = pImplChannel->bIndex;
+	u16 csr = 0;
+
+	DBG(4, "%p, pkt_sz %d, addr 0x%x, len %d, mode %d\n",
+			pChannel, packet_sz, dma_addr, len, mode);
+
+	if (mode) {
+		csr |= 1 << MUSB_HSDMA_MODE1_SHIFT;
+		BUG_ON(len < packet_sz);
+
+		if (packet_sz >= 64) {
+			csr |= MUSB_HSDMA_BURSTMODE_INCR16
+					<< MUSB_HSDMA_BURSTMODE_SHIFT;
+		} else if (packet_sz >= 32) {
+			csr |= MUSB_HSDMA_BURSTMODE_INCR8
+					<< MUSB_HSDMA_BURSTMODE_SHIFT;
+		} else if (packet_sz >= 16) {
+			csr |= MUSB_HSDMA_BURSTMODE_INCR4
+					<< MUSB_HSDMA_BURSTMODE_SHIFT;
+		}
+	}
+
+	csr |= (pImplChannel->epnum << MUSB_HSDMA_ENDPOINT_SHIFT)
+		| (1 << MUSB_HSDMA_ENABLE_SHIFT)
+		| (1 << MUSB_HSDMA_IRQENABLE_SHIFT)
+		| (pImplChannel->transmit
+				? (1 << MUSB_HSDMA_TRANSMIT_SHIFT)
+				: 0);
+
+	/* address/count */
+	musb_writel(mbase,
+		MUSB_HSDMA_CHANNEL_OFFSET(bChannel, MUSB_HSDMA_ADDRESS),
+		dma_addr);
+	musb_writel(mbase,
+		MUSB_HSDMA_CHANNEL_OFFSET(bChannel, MUSB_HSDMA_COUNT),
+		len);
+
+	/* control (this should start things) */
+	musb_writew(mbase,
+		MUSB_HSDMA_CHANNEL_OFFSET(bChannel, MUSB_HSDMA_CONTROL),
+		csr);
+}
+
+static int dma_channel_program(struct dma_channel *pChannel,
+				u16 packet_sz, u8 mode,
+				dma_addr_t dma_addr, u32 len)
+{
+	struct musb_dma_channel *pImplChannel =
+			(struct musb_dma_channel *) pChannel->private_data;
+
+	DBG(2, "ep%d-%s pkt_sz %d, dma_addr 0x%x length %d, mode %d\n",
+		pImplChannel->epnum,
+		pImplChannel->transmit ? "Tx" : "Rx",
+		packet_sz, dma_addr, len, mode);
+
+	BUG_ON(pChannel->status == MUSB_DMA_STATUS_UNKNOWN ||
+		pChannel->status == MUSB_DMA_STATUS_BUSY);
+
+	pChannel->actual_len = 0;
+	pImplChannel->dwStartAddress = dma_addr;
+	pImplChannel->len = len;
+	pImplChannel->wMaxPacketSize = packet_sz;
+	pChannel->status = MUSB_DMA_STATUS_BUSY;
+
+	if ((mode == 1) && (len >= packet_sz))
+		configure_channel(pChannel, packet_sz, 1, dma_addr, len);
+	else
+		configure_channel(pChannel, packet_sz, 0, dma_addr, len);
+
+	return true;
+}
+
+static int dma_channel_abort(struct dma_channel *pChannel)
+{
+	struct musb_dma_channel *pImplChannel =
+		(struct musb_dma_channel *) pChannel->private_data;
+	u8 bChannel = pImplChannel->bIndex;
+	void __iomem *mbase = pImplChannel->controller->pCoreBase;
+	u16 csr;
+
+	if (pChannel->status == MUSB_DMA_STATUS_BUSY) {
+		if (pImplChannel->transmit) {
+
+			csr = musb_readw(mbase,
+				MUSB_EP_OFFSET(pImplChannel->epnum,
+						MUSB_TXCSR));
+			csr &= ~(MUSB_TXCSR_AUTOSET |
+				 MUSB_TXCSR_DMAENAB |
+				 MUSB_TXCSR_DMAMODE);
+			musb_writew(mbase,
+				MUSB_EP_OFFSET(pImplChannel->epnum,
+						MUSB_TXCSR),
+				csr);
+		} else {
+			csr = musb_readw(mbase,
+				MUSB_EP_OFFSET(pImplChannel->epnum,
+						MUSB_RXCSR));
+			csr &= ~(MUSB_RXCSR_AUTOCLEAR |
+				 MUSB_RXCSR_DMAENAB |
+				 MUSB_RXCSR_DMAMODE);
+			musb_writew(mbase,
+				MUSB_EP_OFFSET(pImplChannel->epnum,
+						MUSB_RXCSR),
+				csr);
+		}
+
+		musb_writew(mbase,
+			MUSB_HSDMA_CHANNEL_OFFSET(bChannel, MUSB_HSDMA_CONTROL),
+			0);
+		musb_writel(mbase,
+			MUSB_HSDMA_CHANNEL_OFFSET(bChannel, MUSB_HSDMA_ADDRESS),
+			0);
+		musb_writel(mbase,
+			MUSB_HSDMA_CHANNEL_OFFSET(bChannel, MUSB_HSDMA_COUNT),
+			0);
+
+		pChannel->status = MUSB_DMA_STATUS_FREE;
+	}
+	return 0;
+}
+
+static irqreturn_t dma_controller_irq(int irq, void *private_data)
+{
+	struct musb_dma_controller *controller =
+		(struct musb_dma_controller *)private_data;
+	struct musb_dma_channel *pImplChannel;
+	struct musb *musb = controller->pDmaPrivate;
+	void __iomem *mbase = controller->pCoreBase;
+	struct dma_channel *pChannel;
+	u8 bChannel;
+	u16 csr;
+	u32 dwAddress;
+	u8 int_hsdma;
+	irqreturn_t retval = IRQ_NONE;
+	unsigned long flags;
+
+	spin_lock_irqsave(&musb->lock, flags);
+
+	int_hsdma = musb_readb(mbase, MUSB_HSDMA_INTR);
+	if (!int_hsdma)
+		goto done;
+
+	for (bChannel = 0; bChannel < MUSB_HSDMA_CHANNELS; bChannel++) {
+		if (int_hsdma & (1 << bChannel)) {
+			pImplChannel = (struct musb_dma_channel *)
+					&(controller->aChannel[bChannel]);
+			pChannel = &pImplChannel->Channel;
+
+			csr = musb_readw(mbase,
+					MUSB_HSDMA_CHANNEL_OFFSET(bChannel,
+							MUSB_HSDMA_CONTROL));
+
+			if (csr & (1 << MUSB_HSDMA_BUSERROR_SHIFT))
+				pImplChannel->Channel.status =
+					MUSB_DMA_STATUS_BUS_ABORT;
+			else {
+				u8 devctl;
+
+				dwAddress = musb_readl(mbase,
+						MUSB_HSDMA_CHANNEL_OFFSET(
+							bChannel,
+							MUSB_HSDMA_ADDRESS));
+				pChannel->actual_len = dwAddress
+					- pImplChannel->dwStartAddress;
+
+				DBG(2, "ch %p, 0x%x -> 0x%x (%d / %d) %s\n",
+					pChannel, pImplChannel->dwStartAddress,
+					dwAddress, pChannel->actual_len,
+					pImplChannel->len,
+					(pChannel->actual_len
+						< pImplChannel->len) ?
+					"=> reconfig 0" : "=> complete");
+
+				devctl = musb_readb(mbase, MUSB_DEVCTL);
+
+				pChannel->status = MUSB_DMA_STATUS_FREE;
+
+				/* completed */
+				if ((devctl & MUSB_DEVCTL_HM)
+					&& (pImplChannel->transmit)
+					&& ((pChannel->desired_mode == 0)
+					    || (pChannel->actual_len &
+					    (pImplChannel->wMaxPacketSize - 1)))
+					 ) {
+					/* Send out the packet */
+					musb_ep_select(mbase,
+						pImplChannel->epnum);
+					musb_writew(mbase, MUSB_EP_OFFSET(
+							pImplChannel->epnum,
+							MUSB_TXCSR),
+						MUSB_TXCSR_TXPKTRDY);
+				} else
+					musb_dma_completion(
+						musb,
+						pImplChannel->epnum,
+						pImplChannel->transmit);
+			}
+		}
+	}
+	retval = IRQ_HANDLED;
+done:
+	spin_unlock_irqrestore(&musb->lock, flags);
+	return retval;
+}
+
+void dma_controller_destroy(struct dma_controller *c)
+{
+	struct musb_dma_controller *controller;
+
+	controller = container_of(c, struct musb_dma_controller, Controller);
+	if (!controller)
+		return;
+
+	if (controller->irq)
+		free_irq(controller->irq, c);
+
+	kfree(controller);
+}
+
+struct dma_controller *__init
+dma_controller_create(struct musb *musb, void __iomem *pCoreBase)
+{
+	struct musb_dma_controller *controller;
+	struct device *dev = musb->controller;
+	struct platform_device *pdev = to_platform_device(dev);
+	int irq = platform_get_irq(pdev, 1);
+
+	if (irq == 0) {
+		dev_err(dev, "No DMA interrupt line!\n");
+		return NULL;
+	}
+
+	controller = kzalloc(sizeof(struct musb_dma_controller), GFP_KERNEL);
+	if (!controller)
+		return NULL;
+
+	controller->bChannelCount = MUSB_HSDMA_CHANNELS;
+	controller->pDmaPrivate = musb;
+	controller->pCoreBase = pCoreBase;
+
+	controller->Controller.start = dma_controller_start;
+	controller->Controller.stop = dma_controller_stop;
+	controller->Controller.channel_alloc = dma_channel_allocate;
+	controller->Controller.channel_release = dma_channel_release;
+	controller->Controller.channel_program = dma_channel_program;
+	controller->Controller.channel_abort = dma_channel_abort;
+
+	if (request_irq(irq, dma_controller_irq, IRQF_DISABLED,
+			musb->controller->bus_id, &controller->Controller)) {
+		dev_err(dev, "request_irq %d failed!\n", irq);
+		dma_controller_destroy(&controller->Controller);
+		return NULL;
+	}
+
+	controller->irq = irq;
+
+	return &controller->Controller;
+}