forked from Minki/linux
21b650c236
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: Chen-Yu Tsai <wens@csie.org> Acked-by: Bin Liu <b-liu@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
223 lines
6.7 KiB
C
223 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* MUSB OTG driver DMA controller abstraction
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*
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* Copyright 2005 Mentor Graphics Corporation
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* Copyright (C) 2005-2006 by Texas Instruments
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* Copyright (C) 2006-2007 Nokia Corporation
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*/
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#ifndef __MUSB_DMA_H__
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#define __MUSB_DMA_H__
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struct musb_hw_ep;
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/*
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* DMA Controller Abstraction
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*
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* DMA Controllers are abstracted to allow use of a variety of different
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* implementations of DMA, as allowed by the Inventra USB cores. On the
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* host side, usbcore sets up the DMA mappings and flushes caches; on the
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* peripheral side, the gadget controller driver does. Responsibilities
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* of a DMA controller driver include:
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*
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* - Handling the details of moving multiple USB packets
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* in cooperation with the Inventra USB core, including especially
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* the correct RX side treatment of short packets and buffer-full
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* states (both of which terminate transfers).
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*
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* - Knowing the correlation between dma channels and the
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* Inventra core's local endpoint resources and data direction.
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*
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* - Maintaining a list of allocated/available channels.
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*
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* - Updating channel status on interrupts,
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* whether shared with the Inventra core or separate.
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*/
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#define DMA_ADDR_INVALID (~(dma_addr_t)0)
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#ifdef CONFIG_MUSB_PIO_ONLY
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#define is_dma_capable() (0)
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#else
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#define is_dma_capable() (1)
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#endif
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#ifdef CONFIG_USB_UX500_DMA
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#define musb_dma_ux500(musb) (musb->io.quirks & MUSB_DMA_UX500)
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#else
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#define musb_dma_ux500(musb) 0
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#endif
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#ifdef CONFIG_USB_TI_CPPI41_DMA
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#define musb_dma_cppi41(musb) (musb->io.quirks & MUSB_DMA_CPPI41)
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#else
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#define musb_dma_cppi41(musb) 0
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#endif
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#ifdef CONFIG_USB_TI_CPPI_DMA
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#define musb_dma_cppi(musb) (musb->io.quirks & MUSB_DMA_CPPI)
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#else
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#define musb_dma_cppi(musb) 0
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#endif
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#ifdef CONFIG_USB_TUSB_OMAP_DMA
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#define tusb_dma_omap(musb) (musb->io.quirks & MUSB_DMA_TUSB_OMAP)
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#else
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#define tusb_dma_omap(musb) 0
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#endif
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#ifdef CONFIG_USB_INVENTRA_DMA
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#define musb_dma_inventra(musb) (musb->io.quirks & MUSB_DMA_INVENTRA)
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#else
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#define musb_dma_inventra(musb) 0
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#endif
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#if defined(CONFIG_USB_TI_CPPI_DMA) || defined(CONFIG_USB_TI_CPPI41_DMA)
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#define is_cppi_enabled(musb) \
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(musb_dma_cppi(musb) || musb_dma_cppi41(musb))
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#else
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#define is_cppi_enabled(musb) 0
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#endif
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/* Anomaly 05000456 - USB Receive Interrupt Is Not Generated in DMA Mode 1
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* Only allow DMA mode 1 to be used when the USB will actually generate the
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* interrupts we expect.
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*/
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#ifdef CONFIG_BLACKFIN
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# undef USE_MODE1
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# if !ANOMALY_05000456
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# define USE_MODE1
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# endif
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#endif
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/*
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* DMA channel status ... updated by the dma controller driver whenever that
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* status changes, and protected by the overall controller spinlock.
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*/
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enum dma_channel_status {
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/* unallocated */
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MUSB_DMA_STATUS_UNKNOWN,
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/* allocated ... but not busy, no errors */
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MUSB_DMA_STATUS_FREE,
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/* busy ... transactions are active */
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MUSB_DMA_STATUS_BUSY,
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/* transaction(s) aborted due to ... dma or memory bus error */
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MUSB_DMA_STATUS_BUS_ABORT,
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/* transaction(s) aborted due to ... core error or USB fault */
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MUSB_DMA_STATUS_CORE_ABORT
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};
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struct dma_controller;
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/**
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* struct dma_channel - A DMA channel.
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* @private_data: channel-private data
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* @max_len: the maximum number of bytes the channel can move in one
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* transaction (typically representing many USB maximum-sized packets)
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* @actual_len: how many bytes have been transferred
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* @status: current channel status (updated e.g. on interrupt)
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* @desired_mode: true if mode 1 is desired; false if mode 0 is desired
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*
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* channels are associated with an endpoint for the duration of at least
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* one usb transfer.
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*/
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struct dma_channel {
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void *private_data;
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/* FIXME not void* private_data, but a dma_controller * */
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size_t max_len;
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size_t actual_len;
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enum dma_channel_status status;
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bool desired_mode;
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bool rx_packet_done;
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};
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/*
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* dma_channel_status - return status of dma channel
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* @c: the channel
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*
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* Returns the software's view of the channel status. If that status is BUSY
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* then it's possible that the hardware has completed (or aborted) a transfer,
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* so the driver needs to update that status.
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*/
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static inline enum dma_channel_status
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dma_channel_status(struct dma_channel *c)
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{
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return (is_dma_capable() && c) ? c->status : MUSB_DMA_STATUS_UNKNOWN;
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}
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/**
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* struct dma_controller - A DMA Controller.
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* @musb: the usb controller
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* @start: call this to start a DMA controller;
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* return 0 on success, else negative errno
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* @stop: call this to stop a DMA controller
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* return 0 on success, else negative errno
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* @channel_alloc: call this to allocate a DMA channel
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* @channel_release: call this to release a DMA channel
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* @channel_abort: call this to abort a pending DMA transaction,
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* returning it to FREE (but allocated) state
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* @dma_callback: invoked on DMA completion, useful to run platform
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* code such IRQ acknowledgment.
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*
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* Controllers manage dma channels.
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*/
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struct dma_controller {
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struct musb *musb;
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struct dma_channel *(*channel_alloc)(struct dma_controller *,
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struct musb_hw_ep *, u8 is_tx);
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void (*channel_release)(struct dma_channel *);
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int (*channel_program)(struct dma_channel *channel,
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u16 maxpacket, u8 mode,
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dma_addr_t dma_addr,
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u32 length);
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int (*channel_abort)(struct dma_channel *);
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int (*is_compatible)(struct dma_channel *channel,
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u16 maxpacket,
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void *buf, u32 length);
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void (*dma_callback)(struct dma_controller *);
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};
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/* called after channel_program(), may indicate a fault */
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extern void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit);
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#ifdef CONFIG_MUSB_PIO_ONLY
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static inline struct dma_controller *
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musb_dma_controller_create(struct musb *m, void __iomem *io)
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{
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return NULL;
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}
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static inline void musb_dma_controller_destroy(struct dma_controller *d) { }
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#else
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extern struct dma_controller *
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(*musb_dma_controller_create)(struct musb *, void __iomem *);
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extern void (*musb_dma_controller_destroy)(struct dma_controller *);
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#endif
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/* Platform specific DMA functions */
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extern struct dma_controller *
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musbhs_dma_controller_create(struct musb *musb, void __iomem *base);
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extern void musbhs_dma_controller_destroy(struct dma_controller *c);
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extern struct dma_controller *
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tusb_dma_controller_create(struct musb *musb, void __iomem *base);
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extern void tusb_dma_controller_destroy(struct dma_controller *c);
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extern struct dma_controller *
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cppi_dma_controller_create(struct musb *musb, void __iomem *base);
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extern void cppi_dma_controller_destroy(struct dma_controller *c);
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extern struct dma_controller *
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cppi41_dma_controller_create(struct musb *musb, void __iomem *base);
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extern void cppi41_dma_controller_destroy(struct dma_controller *c);
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extern struct dma_controller *
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ux500_dma_controller_create(struct musb *musb, void __iomem *base);
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extern void ux500_dma_controller_destroy(struct dma_controller *c);
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#endif /* __MUSB_DMA_H__ */
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