aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/mmc/dw_mmc.h
blob: 7c6a1139d8faf9ad54af671c68cd81ea3dcebf2f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
/*
 * Synopsys DesignWare Multimedia Card Interface driver
 *  (Based on NXP driver for lpc 31xx)
 *
 * Copyright (C) 2009 NXP Semiconductors
 * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
 *
 * 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
 * (at your option) any later version.
 */

#ifndef LINUX_MMC_DW_MMC_H
#define LINUX_MMC_DW_MMC_H

#include <linux/scatterlist.h>

#define MAX_MCI_SLOTS	2

enum dw_mci_state {
	STATE_IDLE = 0,
	STATE_SENDING_CMD,
	STATE_SENDING_DATA,
	STATE_DATA_BUSY,
	STATE_SENDING_STOP,
	STATE_DATA_ERROR,
};

enum {
	EVENT_CMD_COMPLETE = 0,
	EVENT_XFER_COMPLETE,
	EVENT_DATA_COMPLETE,
	EVENT_DATA_ERROR,
	EVENT_XFER_ERROR
};

struct mmc_data;

/**
 * struct dw_mci - MMC controller state shared between all slots
 * @lock: Spinlock protecting the queue and associated data.
 * @regs: Pointer to MMIO registers.
 * @sg: Scatterlist entry currently being processed by PIO code, if any.
 * @sg_miter: PIO mapping scatterlist iterator.
 * @cur_slot: The slot which is currently using the controller.
 * @mrq: The request currently being processed on @cur_slot,
 *	or NULL if the controller is idle.
 * @cmd: The command currently being sent to the card, or NULL.
 * @data: The data currently being transferred, or NULL if no data
 *	transfer is in progress.
 * @use_dma: Whether DMA channel is initialized or not.
 * @using_dma: Whether DMA is in use for the current transfer.
 * @sg_dma: Bus address of DMA buffer.
 * @sg_cpu: Virtual address of DMA buffer.
 * @dma_ops: Pointer to platform-specific DMA callbacks.
 * @cmd_status: Snapshot of SR taken upon completion of the current
 *	command. Only valid when EVENT_CMD_COMPLETE is pending.
 * @data_status: Snapshot of SR taken upon completion of the current
 *	data transfer. Only valid when EVENT_DATA_COMPLETE or
 *	EVENT_DATA_ERROR is pending.
 * @stop_cmdr: Value to be loaded into CMDR when the stop command is
 *	to be sent.
 * @dir_status: Direction of current transfer.
 * @tasklet: Tasklet running the request state machine.
 * @card_tasklet: Tasklet handling card detect.
 * @pending_events: Bitmask of events flagged by the interrupt handler
 *	to be processed by the tasklet.
 * @completed_events: Bitmask of events which the state machine has
 *	processed.
 * @state: Tasklet state.
 * @queue: List of slots waiting for access to the controller.
 * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
 *	rate and timeout calculations.
 * @current_speed: Configured rate of the controller.
 * @num_slots: Number of slots available.
 * @verid: Denote Version ID.
 * @data_offset: Set the offset of DATA register according to VERID.
 * @dev: Device associated with the MMC controller.
 * @pdata: Platform data associated with the MMC controller.
 * @drv_data: Driver specific data for identified variant of the controller
 * @priv: Implementation defined private data.
 * @biu_clk: Pointer to bus interface unit clock instance.
 * @ciu_clk: Pointer to card interface unit clock instance.
 * @slot: Slots sharing this MMC controller.
 * @fifo_depth: depth of FIFO.
 * @data_shift: log2 of FIFO item size.
 * @part_buf_start: Start index in part_buf.
 * @part_buf_count: Bytes of partial data in part_buf.
 * @part_buf: Simple buffer for partial fifo reads/writes.
 * @push_data: Pointer to FIFO push function.
 * @pull_data: Pointer to FIFO pull function.
 * @quirks: Set of quirks that apply to specific versions of the IP.
 * @irq_flags: The flags to be passed to request_irq.
 * @irq: The irq value to be passed to request_irq.
 *
 * Locking
 * =======
 *
 * @lock is a softirq-safe spinlock protecting @queue as well as
 * @cur_slot, @mrq and @state. These must always be updated
 * at the same time while holding @lock.
 *
 * The @mrq field of struct dw_mci_slot is also protected by @lock,
 * and must always be written at the same time as the slot is added to
 * @queue.
 *
 * @pending_events and @completed_events are accessed using atomic bit
 * operations, so they don't need any locking.
 *
 * None of the fields touched by the interrupt handler need any
 * locking. However, ordering is important: Before EVENT_DATA_ERROR or
 * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
 * interrupts must be disabled and @data_status updated with a
 * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
 * CMDRDY interrupt must be disabled and @cmd_status updated with a
 * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
 * bytes_xfered field of @data must be written. This is ensured by
 * using barriers.
 */
struct dw_mci {
	spinlock_t		lock;
	void __iomem		*regs;

	struct scatterlist	*sg;
	struct sg_mapping_iter	sg_miter;

	struct dw_mci_slot	*cur_slot;
	struct mmc_request	*mrq;
	struct mmc_command	*cmd;
	struct mmc_data		*data;
	struct workqueue_struct	*card_workqueue;

	/* DMA interface members*/
	int			use_dma;
	int			using_dma;

	dma_addr_t		sg_dma;
	void			*sg_cpu;
	struct dw_mci_dma_ops	*dma_ops;
#ifdef CONFIG_MMC_DW_IDMAC
	unsigned int		ring_size;
#else
	struct dw_mci_dma_data	*dma_data;
#endif
	u32			cmd_status;
	u32			data_status;
	u32			stop_cmdr;
	u32			dir_status;
	struct tasklet_struct	tasklet;
	struct work_struct	card_work;
	unsigned long		pending_events;
	unsigned long		completed_events;
	enum dw_mci_state	state;
	struct list_head	queue;

	u32			bus_hz;
	u32			current_speed;
	u32			num_slots;
	u32			fifoth_val;
	u16			verid;
	u16			data_offset;
	struct device		*dev;
	struct dw_mci_board	*pdata;
	struct dw_mci_drv_data	*drv_data;
	void			*priv;
	struct clk		*biu_clk;
	struct clk		*ciu_clk;
	struct dw_mci_slot	*slot[MAX_MCI_SLOTS];

	/* FIFO push and pull */
	int			fifo_depth;
	int			data_shift;
	u8			part_buf_start;
	u8			part_buf_count;
	union {
		u16		part_buf16;
		u32		part_buf32;
		u64		part_buf;
	};
	void (*push_data)(struct dw_mci *host, void *buf, int cnt);
	void (*pull_data)(struct dw_mci *host, void *buf, int cnt);

	/* Workaround flags */
	u32			quirks;

	struct regulator	*vmmc;	/* Power regulator */
	unsigned long		irq_flags; /* IRQ flags */
	unsigned int		irq;
};

/* DMA ops for Internal/External DMAC interface */
struct dw_mci_dma_ops {
	/* DMA Ops */
	int (*init)(struct dw_mci *host);
	void (*start)(struct dw_mci *host, unsigned int sg_len);
	void (*complete)(struct dw_mci *host);
	void (*stop)(struct dw_mci *host);
	void (*cleanup)(struct dw_mci *host);
	void (*exit)(struct dw_mci *host);
};

/* IP Quirks/flags. */
/* DTO fix for command transmission with IDMAC configured */
#define DW_MCI_QUIRK_IDMAC_DTO			BIT(0)
/* delay needed between retries on some 2.11a implementations */
#define DW_MCI_QUIRK_RETRY_DELAY		BIT(1)
/* High Speed Capable - Supports HS cards (up to 50MHz) */
#define DW_MCI_QUIRK_HIGHSPEED			BIT(2)
/* Unreliable card detection */
#define DW_MCI_QUIRK_BROKEN_CARD_DETECTION	BIT(3)
/* Write Protect detection not available */
#define DW_MCI_QUIRK_NO_WRITE_PROTECT		BIT(4)

struct dma_pdata;

struct block_settings {
	unsigned short	max_segs;	/* see blk_queue_max_segments */
	unsigned int	max_blk_size;	/* maximum size of one mmc block */
	unsigned int	max_blk_count;	/* maximum number of blocks in one req*/
	unsigned int	max_req_size;	/* maximum number of bytes in one req*/
	unsigned int	max_seg_size;	/* see blk_queue_max_segment_size */
};

/* Board platform data */
struct dw_mci_board {
	u32 num_slots;

	u32 quirks; /* Workaround / Quirk flags */
	unsigned int bus_hz; /* Clock speed at the cclk_in pad */

	unsigned int caps;	/* Capabilities */
	unsigned int caps2;	/* More capabilities */
	/*
	 * Override fifo depth. If 0, autodetect it from the FIFOTH register,
	 * but note that this may not be reliable after a bootloader has used
	 * it.
	 */
	unsigned int fifo_depth;

	/* delay in mS before detecting cards after interrupt */
	u32 detect_delay_ms;

	int (*init)(u32 slot_id, irq_handler_t , void *);
	int (*get_ro)(u32 slot_id);
	int (*get_cd)(u32 slot_id);
	int (*get_ocr)(u32 slot_id);
	int (*get_bus_wd)(u32 slot_id);
	/*
	 * Enable power to selected slot and set voltage to desired level.
	 * Voltage levels are specified using MMC_VDD_xxx defines defined
	 * in linux/mmc/host.h file.
	 */
	void (*setpower)(u32 slot_id, u32 volt);
	void (*exit)(u32 slot_id);
	void (*select_slot)(u32 slot_id);

	struct dw_mci_dma_ops *dma_ops;
	struct dma_pdata *data;
	struct block_settings *blk_settings;
};

#endif /* LINUX_MMC_DW_MMC_H */