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f95f3850 WN |
1 | /* |
2 | * Synopsys DesignWare Multimedia Card Interface driver | |
3 | * (Based on NXP driver for lpc 31xx) | |
4 | * | |
5 | * Copyright (C) 2009 NXP Semiconductors | |
6 | * Copyright (C) 2009, 2010 Imagination Technologies Ltd. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | */ | |
13 | ||
14 | #ifndef _LINUX_MMC_DW_MMC_H_ | |
15 | #define _LINUX_MMC_DW_MMC_H_ | |
16 | ||
17 | #define MAX_MCI_SLOTS 2 | |
18 | ||
19 | enum dw_mci_state { | |
20 | STATE_IDLE = 0, | |
21 | STATE_SENDING_CMD, | |
22 | STATE_SENDING_DATA, | |
23 | STATE_DATA_BUSY, | |
24 | STATE_SENDING_STOP, | |
25 | STATE_DATA_ERROR, | |
26 | }; | |
27 | ||
28 | enum { | |
29 | EVENT_CMD_COMPLETE = 0, | |
30 | EVENT_XFER_COMPLETE, | |
31 | EVENT_DATA_COMPLETE, | |
32 | EVENT_DATA_ERROR, | |
33 | EVENT_XFER_ERROR | |
34 | }; | |
35 | ||
36 | struct mmc_data; | |
37 | ||
38 | /** | |
39 | * struct dw_mci - MMC controller state shared between all slots | |
40 | * @lock: Spinlock protecting the queue and associated data. | |
41 | * @regs: Pointer to MMIO registers. | |
42 | * @sg: Scatterlist entry currently being processed by PIO code, if any. | |
43 | * @pio_offset: Offset into the current scatterlist entry. | |
44 | * @cur_slot: The slot which is currently using the controller. | |
45 | * @mrq: The request currently being processed on @cur_slot, | |
46 | * or NULL if the controller is idle. | |
47 | * @cmd: The command currently being sent to the card, or NULL. | |
48 | * @data: The data currently being transferred, or NULL if no data | |
49 | * transfer is in progress. | |
50 | * @use_dma: Whether DMA channel is initialized or not. | |
51 | * @sg_dma: Bus address of DMA buffer. | |
52 | * @sg_cpu: Virtual address of DMA buffer. | |
53 | * @dma_ops: Pointer to platform-specific DMA callbacks. | |
54 | * @cmd_status: Snapshot of SR taken upon completion of the current | |
55 | * command. Only valid when EVENT_CMD_COMPLETE is pending. | |
56 | * @data_status: Snapshot of SR taken upon completion of the current | |
57 | * data transfer. Only valid when EVENT_DATA_COMPLETE or | |
58 | * EVENT_DATA_ERROR is pending. | |
59 | * @stop_cmdr: Value to be loaded into CMDR when the stop command is | |
60 | * to be sent. | |
61 | * @dir_status: Direction of current transfer. | |
62 | * @tasklet: Tasklet running the request state machine. | |
63 | * @card_tasklet: Tasklet handling card detect. | |
64 | * @pending_events: Bitmask of events flagged by the interrupt handler | |
65 | * to be processed by the tasklet. | |
66 | * @completed_events: Bitmask of events which the state machine has | |
67 | * processed. | |
68 | * @state: Tasklet state. | |
69 | * @queue: List of slots waiting for access to the controller. | |
70 | * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus | |
71 | * rate and timeout calculations. | |
72 | * @current_speed: Configured rate of the controller. | |
73 | * @num_slots: Number of slots available. | |
74 | * @pdev: Platform device associated with the MMC controller. | |
75 | * @pdata: Platform data associated with the MMC controller. | |
76 | * @slot: Slots sharing this MMC controller. | |
77 | * @data_shift: log2 of FIFO item size. | |
78 | * @push_data: Pointer to FIFO push function. | |
79 | * @pull_data: Pointer to FIFO pull function. | |
80 | * @quirks: Set of quirks that apply to specific versions of the IP. | |
81 | * | |
82 | * Locking | |
83 | * ======= | |
84 | * | |
85 | * @lock is a softirq-safe spinlock protecting @queue as well as | |
86 | * @cur_slot, @mrq and @state. These must always be updated | |
87 | * at the same time while holding @lock. | |
88 | * | |
89 | * The @mrq field of struct dw_mci_slot is also protected by @lock, | |
90 | * and must always be written at the same time as the slot is added to | |
91 | * @queue. | |
92 | * | |
93 | * @pending_events and @completed_events are accessed using atomic bit | |
94 | * operations, so they don't need any locking. | |
95 | * | |
96 | * None of the fields touched by the interrupt handler need any | |
97 | * locking. However, ordering is important: Before EVENT_DATA_ERROR or | |
98 | * EVENT_DATA_COMPLETE is set in @pending_events, all data-related | |
99 | * interrupts must be disabled and @data_status updated with a | |
100 | * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the | |
25985edc | 101 | * CMDRDY interrupt must be disabled and @cmd_status updated with a |
f95f3850 WN |
102 | * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the |
103 | * bytes_xfered field of @data must be written. This is ensured by | |
104 | * using barriers. | |
105 | */ | |
106 | struct dw_mci { | |
107 | spinlock_t lock; | |
108 | void __iomem *regs; | |
109 | ||
110 | struct scatterlist *sg; | |
111 | unsigned int pio_offset; | |
112 | ||
113 | struct dw_mci_slot *cur_slot; | |
114 | struct mmc_request *mrq; | |
115 | struct mmc_command *cmd; | |
116 | struct mmc_data *data; | |
117 | ||
118 | /* DMA interface members*/ | |
119 | int use_dma; | |
120 | ||
121 | dma_addr_t sg_dma; | |
122 | void *sg_cpu; | |
123 | struct dw_mci_dma_ops *dma_ops; | |
124 | #ifdef CONFIG_MMC_DW_IDMAC | |
125 | unsigned int ring_size; | |
126 | #else | |
127 | struct dw_mci_dma_data *dma_data; | |
128 | #endif | |
129 | u32 cmd_status; | |
130 | u32 data_status; | |
131 | u32 stop_cmdr; | |
132 | u32 dir_status; | |
133 | struct tasklet_struct tasklet; | |
134 | struct tasklet_struct card_tasklet; | |
135 | unsigned long pending_events; | |
136 | unsigned long completed_events; | |
137 | enum dw_mci_state state; | |
138 | struct list_head queue; | |
139 | ||
140 | u32 bus_hz; | |
141 | u32 current_speed; | |
142 | u32 num_slots; | |
e61cf118 | 143 | u32 fifoth_val; |
f95f3850 WN |
144 | struct platform_device *pdev; |
145 | struct dw_mci_board *pdata; | |
146 | struct dw_mci_slot *slot[MAX_MCI_SLOTS]; | |
147 | ||
148 | /* FIFO push and pull */ | |
149 | int data_shift; | |
150 | void (*push_data)(struct dw_mci *host, void *buf, int cnt); | |
151 | void (*pull_data)(struct dw_mci *host, void *buf, int cnt); | |
152 | ||
153 | /* Workaround flags */ | |
154 | u32 quirks; | |
c07946a3 JC |
155 | |
156 | struct regulator *vmmc; /* Power regulator */ | |
f95f3850 WN |
157 | }; |
158 | ||
159 | /* DMA ops for Internal/External DMAC interface */ | |
160 | struct dw_mci_dma_ops { | |
161 | /* DMA Ops */ | |
162 | int (*init)(struct dw_mci *host); | |
163 | void (*start)(struct dw_mci *host, unsigned int sg_len); | |
164 | void (*complete)(struct dw_mci *host); | |
165 | void (*stop)(struct dw_mci *host); | |
166 | void (*cleanup)(struct dw_mci *host); | |
167 | void (*exit)(struct dw_mci *host); | |
168 | }; | |
169 | ||
170 | /* IP Quirks/flags. */ | |
f95f3850 | 171 | /* DTO fix for command transmission with IDMAC configured */ |
fc3d7720 | 172 | #define DW_MCI_QUIRK_IDMAC_DTO BIT(0) |
f95f3850 | 173 | /* delay needed between retries on some 2.11a implementations */ |
fc3d7720 | 174 | #define DW_MCI_QUIRK_RETRY_DELAY BIT(1) |
25985edc | 175 | /* High Speed Capable - Supports HS cards (up to 50MHz) */ |
fc3d7720 JC |
176 | #define DW_MCI_QUIRK_HIGHSPEED BIT(2) |
177 | /* Unreliable card detection */ | |
178 | #define DW_MCI_QUIRK_BROKEN_CARD_DETECTION BIT(3) | |
f95f3850 WN |
179 | |
180 | ||
181 | struct dma_pdata; | |
182 | ||
183 | struct block_settings { | |
184 | unsigned short max_segs; /* see blk_queue_max_segments */ | |
185 | unsigned int max_blk_size; /* maximum size of one mmc block */ | |
186 | unsigned int max_blk_count; /* maximum number of blocks in one req*/ | |
187 | unsigned int max_req_size; /* maximum number of bytes in one req*/ | |
188 | unsigned int max_seg_size; /* see blk_queue_max_segment_size */ | |
189 | }; | |
190 | ||
191 | /* Board platform data */ | |
192 | struct dw_mci_board { | |
193 | u32 num_slots; | |
194 | ||
195 | u32 quirks; /* Workaround / Quirk flags */ | |
196 | unsigned int bus_hz; /* Bus speed */ | |
197 | ||
fc3d7720 JC |
198 | unsigned int caps; /* Capabilities */ |
199 | ||
f95f3850 WN |
200 | /* delay in mS before detecting cards after interrupt */ |
201 | u32 detect_delay_ms; | |
202 | ||
203 | int (*init)(u32 slot_id, irq_handler_t , void *); | |
204 | int (*get_ro)(u32 slot_id); | |
205 | int (*get_cd)(u32 slot_id); | |
206 | int (*get_ocr)(u32 slot_id); | |
207 | int (*get_bus_wd)(u32 slot_id); | |
208 | /* | |
209 | * Enable power to selected slot and set voltage to desired level. | |
210 | * Voltage levels are specified using MMC_VDD_xxx defines defined | |
211 | * in linux/mmc/host.h file. | |
212 | */ | |
213 | void (*setpower)(u32 slot_id, u32 volt); | |
214 | void (*exit)(u32 slot_id); | |
215 | void (*select_slot)(u32 slot_id); | |
216 | ||
217 | struct dw_mci_dma_ops *dma_ops; | |
218 | struct dma_pdata *data; | |
219 | struct block_settings *blk_settings; | |
220 | }; | |
221 | ||
222 | #endif /* _LINUX_MMC_DW_MMC_H_ */ |