[linux-2.6-block.git] / drivers / thunderbolt / nhi.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Thunderbolt Cactus Ridge driver - NHI driver
 *
 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
 */

#ifndef DSL3510_H_
#define DSL3510_H_

#include <linux/idr.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>

/**
 * struct tb_nhi - thunderbolt native host interface
 * @lock: Must be held during ring creation/destruction. Is acquired by
 *	  interrupt_work when dispatching interrupts to individual rings.
 * @pdev: Pointer to the PCI device
 * @iobase: MMIO space of the NHI
 * @tx_rings: All Tx rings available on this host controller
 * @rx_rings: All Rx rings available on this host controller
 * @msix_ida: Used to allocate MSI-X vectors for rings
 * @going_away: The host controller device is about to disappear so when
 *		this flag is set, avoid touching the hardware anymore.
 * @interrupt_work: Work scheduled to handle ring interrupt when no
 *		    MSI-X is used.
 * @hop_count: Number of rings (end point hops) supported by NHI.
 */
struct tb_nhi {
	struct mutex lock;
	struct pci_dev *pdev;
	void __iomem *iobase;
	struct tb_ring **tx_rings;
	struct tb_ring **rx_rings;
	struct ida msix_ida;
	bool going_away;
	struct work_struct interrupt_work;
	u32 hop_count;
};

/**
 * struct tb_ring - thunderbolt TX or RX ring associated with a NHI
 * @lock: Lock serializing actions to this ring. Must be acquired after
 *	  nhi->lock.
 * @nhi: Pointer to the native host controller interface
 * @size: Size of the ring
 * @hop: Hop (DMA channel) associated with this ring
 * @head: Head of the ring (write next descriptor here)
 * @tail: Tail of the ring (complete next descriptor here)
 * @descriptors: Allocated descriptors for this ring
 * @queue: Queue holding frames to be transferred over this ring
 * @in_flight: Queue holding frames that are currently in flight
 * @work: Interrupt work structure
 * @is_tx: Is the ring Tx or Rx
 * @running: Is the ring running
 * @irq: MSI-X irq number if the ring uses MSI-X. %0 otherwise.
 * @vector: MSI-X vector number the ring uses (only set if @irq is > 0)
 * @flags: Ring specific flags
 */
struct tb_ring {
	struct mutex lock;
	struct tb_nhi *nhi;
	int size;
	int hop;
	int head;
	int tail;
	struct ring_desc *descriptors;
	dma_addr_t descriptors_dma;
	struct list_head queue;
	struct list_head in_flight;
	struct work_struct work;
	bool is_tx:1;
	bool running:1;
	int irq;
	u8 vector;
	unsigned int flags;
};

/* Leave ring interrupt enabled on suspend */
#define RING_FLAG_NO_SUSPEND	BIT(0)

struct ring_frame;
typedef void (*ring_cb)(struct tb_ring*, struct ring_frame*, bool canceled);

/**
 * struct ring_frame - for use with ring_rx/ring_tx
 */
struct ring_frame {
	dma_addr_t buffer_phy;
	ring_cb callback;
	struct list_head list;
	u32 size:12; /* TX: in, RX: out*/
	u32 flags:12; /* RX: out */
	u32 eof:4; /* TX:in, RX: out */
	u32 sof:4; /* TX:in, RX: out */
};

#define TB_FRAME_SIZE 0x100    /* minimum size for ring_rx */

struct tb_ring *ring_alloc_tx(struct tb_nhi *nhi, int hop, int size,
			      unsigned int flags);
struct tb_ring *ring_alloc_rx(struct tb_nhi *nhi, int hop, int size,
			      unsigned int flags);
void ring_start(struct tb_ring *ring);
void ring_stop(struct tb_ring *ring);
void ring_free(struct tb_ring *ring);

int __ring_enqueue(struct tb_ring *ring, struct ring_frame *frame);

/**
 * ring_rx() - enqueue a frame on an RX ring
 *
 * frame->buffer, frame->buffer_phy and frame->callback have to be set. The
 * buffer must contain at least TB_FRAME_SIZE bytes.
 *
 * frame->callback will be invoked with frame->size, frame->flags, frame->eof,
 * frame->sof set once the frame has been received.
 *
 * If ring_stop is called after the packet has been enqueued frame->callback
 * will be called with canceled set to true.
 *
 * Return: Returns ESHUTDOWN if ring_stop has been called. Zero otherwise.
 */
static inline int ring_rx(struct tb_ring *ring, struct ring_frame *frame)
{
	WARN_ON(ring->is_tx);
	return __ring_enqueue(ring, frame);
}

/**
 * ring_tx() - enqueue a frame on an TX ring
 *
 * frame->buffer, frame->buffer_phy, frame->callback, frame->size, frame->eof
 * and frame->sof have to be set.
 *
 * frame->callback will be invoked with once the frame has been transmitted.
 *
 * If ring_stop is called after the packet has been enqueued frame->callback
 * will be called with canceled set to true.
 *
 * Return: Returns ESHUTDOWN if ring_stop has been called. Zero otherwise.
 */
static inline int ring_tx(struct tb_ring *ring, struct ring_frame *frame)
{
	WARN_ON(!ring->is_tx);
	return __ring_enqueue(ring, frame);
}

enum nhi_fw_mode {
	NHI_FW_SAFE_MODE,
	NHI_FW_AUTH_MODE,
	NHI_FW_EP_MODE,
	NHI_FW_CM_MODE,
};

enum nhi_mailbox_cmd {
	NHI_MAILBOX_SAVE_DEVS = 0x05,
	NHI_MAILBOX_DISCONNECT_PCIE_PATHS = 0x06,
	NHI_MAILBOX_DRV_UNLOADS = 0x07,
	NHI_MAILBOX_ALLOW_ALL_DEVS = 0x23,
};

int nhi_mailbox_cmd(struct tb_nhi *nhi, enum nhi_mailbox_cmd cmd, u32 data);
enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi);

/*
 * PCI IDs used in this driver from Win Ridge forward. There is no
 * need for the PCI quirk anymore as we will use ICM also on Apple
 * hardware.
 */
#define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_NHI            0x157d
#define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE         0x157e
#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI		0x15bf
#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE	0x15c0
#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI	0x15d2
#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE	0x15d3
#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI	0x15d9
#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE	0x15da
#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_USBONLY_NHI	0x15dc
#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_USBONLY_NHI	0x15dd
#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_USBONLY_NHI	0x15de

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
16603153 AN	2	/*
	3	* Thunderbolt Cactus Ridge driver - NHI driver
	4	*
	5	* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
	6	*/
	7
	8	#ifndef DSL3510_H_
	9	#define DSL3510_H_
	10
046bee1f	11	#include <linux/idr.h>
16603153 AN	12	#include <linux/mutex.h>
	13	#include <linux/workqueue.h>
	14
	15	/**
	16	* struct tb_nhi - thunderbolt native host interface
046bee1f MW	17	* @lock: Must be held during ring creation/destruction. Is acquired by
	18	* interrupt_work when dispatching interrupts to individual rings.
	19	* @pdev: Pointer to the PCI device
	20	* @iobase: MMIO space of the NHI
	21	* @tx_rings: All Tx rings available on this host controller
	22	* @rx_rings: All Rx rings available on this host controller
	23	* @msix_ida: Used to allocate MSI-X vectors for rings
bdccf295 MW	24	* @going_away: The host controller device is about to disappear so when
bdccf295 MW	25	* this flag is set, avoid touching the hardware anymore.
046bee1f MW	26	* @interrupt_work: Work scheduled to handle ring interrupt when no
	27	* MSI-X is used.
	28	* @hop_count: Number of rings (end point hops) supported by NHI.
16603153 AN	29	*/
16603153 AN	30	struct tb_nhi {
046bee1f	31	struct mutex lock;
16603153 AN	32	struct pci_dev *pdev;
	33	void __iomem *iobase;
	34	struct tb_ring **tx_rings;
	35	struct tb_ring **rx_rings;
046bee1f	36	struct ida msix_ida;
bdccf295	37	bool going_away;
16603153	38	struct work_struct interrupt_work;
046bee1f	39	u32 hop_count;
16603153 AN	40	};
	41
	42	/**
	43	* struct tb_ring - thunderbolt TX or RX ring associated with a NHI
046bee1f MW	44	* @lock: Lock serializing actions to this ring. Must be acquired after
	45	* nhi->lock.
	46	* @nhi: Pointer to the native host controller interface
	47	* @size: Size of the ring
	48	* @hop: Hop (DMA channel) associated with this ring
	49	* @head: Head of the ring (write next descriptor here)
	50	* @tail: Tail of the ring (complete next descriptor here)
	51	* @descriptors: Allocated descriptors for this ring
	52	* @queue: Queue holding frames to be transferred over this ring
	53	* @in_flight: Queue holding frames that are currently in flight
	54	* @work: Interrupt work structure
	55	* @is_tx: Is the ring Tx or Rx
	56	* @running: Is the ring running
	57	* @irq: MSI-X irq number if the ring uses MSI-X. %0 otherwise.
	58	* @vector: MSI-X vector number the ring uses (only set if @irq is > 0)
	59	* @flags: Ring specific flags
16603153 AN	60	*/
16603153 AN	61	struct tb_ring {
046bee1f	62	struct mutex lock;
16603153 AN	63	struct tb_nhi *nhi;
	64	int size;
	65	int hop;
046bee1f MW	66	int head;
046bee1f MW	67	int tail;
16603153 AN	68	struct ring_desc *descriptors;
	69	dma_addr_t descriptors_dma;
	70	struct list_head queue;
	71	struct list_head in_flight;
	72	struct work_struct work;
046bee1f	73	bool is_tx:1;
16603153	74	bool running:1;
046bee1f MW	75	int irq;
	76	u8 vector;
	77	unsigned int flags;
16603153 AN	78	};
16603153 AN	79
046bee1f MW	80	/* Leave ring interrupt enabled on suspend */
	81	#define RING_FLAG_NO_SUSPEND BIT(0)
	82
16603153 AN	83	struct ring_frame;
	84	typedef void (ring_cb)(struct tb_ring, struct ring_frame*, bool canceled);
	85
	86	/**
	87	* struct ring_frame - for use with ring_rx/ring_tx
	88	*/
	89	struct ring_frame {
	90	dma_addr_t buffer_phy;
	91	ring_cb callback;
	92	struct list_head list;
	93	u32 size:12; /* TX: in, RX: out*/
	94	u32 flags:12; /* RX: out */
	95	u32 eof:4; /* TX:in, RX: out */
	96	u32 sof:4; /* TX:in, RX: out */
	97	};
	98
	99	#define TB_FRAME_SIZE 0x100 /* minimum size for ring_rx */
	100
046bee1f MW	101	struct tb_ring ring_alloc_tx(struct tb_nhi nhi, int hop, int size,
	102	unsigned int flags);
	103	struct tb_ring ring_alloc_rx(struct tb_nhi nhi, int hop, int size,
	104	unsigned int flags);
16603153 AN	105	void ring_start(struct tb_ring *ring);
	106	void ring_stop(struct tb_ring *ring);
	107	void ring_free(struct tb_ring *ring);
	108
	109	int __ring_enqueue(struct tb_ring ring, struct ring_frame frame);
	110
	111	/**
	112	* ring_rx() - enqueue a frame on an RX ring
	113	*
	114	* frame->buffer, frame->buffer_phy and frame->callback have to be set. The
	115	* buffer must contain at least TB_FRAME_SIZE bytes.
	116	*
	117	* frame->callback will be invoked with frame->size, frame->flags, frame->eof,
	118	* frame->sof set once the frame has been received.
	119	*
	120	* If ring_stop is called after the packet has been enqueued frame->callback
	121	* will be called with canceled set to true.
	122	*
	123	* Return: Returns ESHUTDOWN if ring_stop has been called. Zero otherwise.
	124	*/
	125	static inline int ring_rx(struct tb_ring ring, struct ring_frame frame)
	126	{
	127	WARN_ON(ring->is_tx);
	128	return __ring_enqueue(ring, frame);
	129	}
	130
	131	/**
	132	* ring_tx() - enqueue a frame on an TX ring
	133	*
	134	* frame->buffer, frame->buffer_phy, frame->callback, frame->size, frame->eof
	135	* and frame->sof have to be set.
	136	*
	137	* frame->callback will be invoked with once the frame has been transmitted.
	138	*
	139	* If ring_stop is called after the packet has been enqueued frame->callback
	140	* will be called with canceled set to true.
	141	*
	142	* Return: Returns ESHUTDOWN if ring_stop has been called. Zero otherwise.
	143	*/
	144	static inline int ring_tx(struct tb_ring ring, struct ring_frame frame)
	145	{
	146	WARN_ON(!ring->is_tx);
	147	return __ring_enqueue(ring, frame);
	148	}
	149
cd446ee2 MW	150	enum nhi_fw_mode {
	151	NHI_FW_SAFE_MODE,
	152	NHI_FW_AUTH_MODE,
	153	NHI_FW_EP_MODE,
	154	NHI_FW_CM_MODE,
	155	};
	156
	157	enum nhi_mailbox_cmd {
	158	NHI_MAILBOX_SAVE_DEVS = 0x05,
e6b245cc	159	NHI_MAILBOX_DISCONNECT_PCIE_PATHS = 0x06,
cd446ee2 MW	160	NHI_MAILBOX_DRV_UNLOADS = 0x07,
	161	NHI_MAILBOX_ALLOW_ALL_DEVS = 0x23,
	162	};
	163
	164	int nhi_mailbox_cmd(struct tb_nhi *nhi, enum nhi_mailbox_cmd cmd, u32 data);
	165	enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi);
	166
5e2781bc MW	167	/*
	168	* PCI IDs used in this driver from Win Ridge forward. There is no
	169	* need for the PCI quirk anymore as we will use ICM also on Apple
	170	* hardware.
	171	*/
	172	#define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_NHI 0x157d
	173	#define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE 0x157e
	174	#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI 0x15bf
	175	#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE 0x15c0
	176	#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI 0x15d2
	177	#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE 0x15d3
	178	#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI 0x15d9
	179	#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE 0x15da
	180	#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_USBONLY_NHI 0x15dc
	181	#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_USBONLY_NHI 0x15dd
	182	#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_USBONLY_NHI 0x15de
	183
16603153	184	#endif