2 * Synopsys DesignWare Multimedia Card Interface driver
3 * (Based on NXP driver for lpc 31xx)
5 * Copyright (C) 2009 NXP Semiconductors
6 * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
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.
14 #ifndef LINUX_MMC_DW_MMC_H
15 #define LINUX_MMC_DW_MMC_H
17 #include <linux/scatterlist.h>
18 #include <linux/mmc/core.h>
19 #include <linux/dmaengine.h>
21 #define MAX_MCI_SLOTS 2
31 STATE_WAITING_CMD11_DONE
,
35 EVENT_CMD_COMPLETE
= 0,
50 struct dw_mci_dma_slave
{
52 enum dma_transfer_direction direction
;
56 * struct dw_mci - MMC controller state shared between all slots
57 * @lock: Spinlock protecting the queue and associated data.
58 * @irq_lock: Spinlock protecting the INTMASK setting.
59 * @regs: Pointer to MMIO registers.
60 * @fifo_reg: Pointer to MMIO registers for data FIFO
61 * @sg: Scatterlist entry currently being processed by PIO code, if any.
62 * @sg_miter: PIO mapping scatterlist iterator.
63 * @cur_slot: The slot which is currently using the controller.
64 * @mrq: The request currently being processed on @cur_slot,
65 * or NULL if the controller is idle.
66 * @cmd: The command currently being sent to the card, or NULL.
67 * @data: The data currently being transferred, or NULL if no data
68 * transfer is in progress.
69 * @stop_abort: The command currently prepared for stoping transfer.
70 * @prev_blksz: The former transfer blksz record.
71 * @timing: Record of current ios timing.
72 * @use_dma: Whether DMA channel is initialized or not.
73 * @using_dma: Whether DMA is in use for the current transfer.
74 * @dma_64bit_address: Whether DMA supports 64-bit address mode or not.
75 * @sg_dma: Bus address of DMA buffer.
76 * @sg_cpu: Virtual address of DMA buffer.
77 * @dma_ops: Pointer to platform-specific DMA callbacks.
78 * @cmd_status: Snapshot of SR taken upon completion of the current
79 * @ring_size: Buffer size for idma descriptors.
80 * command. Only valid when EVENT_CMD_COMPLETE is pending.
81 * @dms: structure of slave-dma private data.
82 * @phy_regs: physical address of controller's register map
83 * @data_status: Snapshot of SR taken upon completion of the current
84 * data transfer. Only valid when EVENT_DATA_COMPLETE or
85 * EVENT_DATA_ERROR is pending.
86 * @stop_cmdr: Value to be loaded into CMDR when the stop command is
88 * @dir_status: Direction of current transfer.
89 * @tasklet: Tasklet running the request state machine.
90 * @pending_events: Bitmask of events flagged by the interrupt handler
91 * to be processed by the tasklet.
92 * @completed_events: Bitmask of events which the state machine has
94 * @state: Tasklet state.
95 * @queue: List of slots waiting for access to the controller.
96 * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
97 * rate and timeout calculations.
98 * @current_speed: Configured rate of the controller.
99 * @num_slots: Number of slots available.
100 * @fifoth_val: The value of FIFOTH register.
101 * @verid: Denote Version ID.
102 * @dev: Device associated with the MMC controller.
103 * @pdata: Platform data associated with the MMC controller.
104 * @drv_data: Driver specific data for identified variant of the controller
105 * @priv: Implementation defined private data.
106 * @biu_clk: Pointer to bus interface unit clock instance.
107 * @ciu_clk: Pointer to card interface unit clock instance.
108 * @slot: Slots sharing this MMC controller.
109 * @fifo_depth: depth of FIFO.
110 * @data_shift: log2 of FIFO item size.
111 * @part_buf_start: Start index in part_buf.
112 * @part_buf_count: Bytes of partial data in part_buf.
113 * @part_buf: Simple buffer for partial fifo reads/writes.
114 * @push_data: Pointer to FIFO push function.
115 * @pull_data: Pointer to FIFO pull function.
116 * @quirks: Set of quirks that apply to specific versions of the IP.
117 * @vqmmc_enabled: Status of vqmmc, should be true or false.
118 * @irq_flags: The flags to be passed to request_irq.
119 * @irq: The irq value to be passed to request_irq.
120 * @sdio_id0: Number of slot0 in the SDIO interrupt registers.
121 * @cmd11_timer: Timer for SD3.0 voltage switch over scheme.
122 * @dto_timer: Timer for broken data transfer over scheme.
127 * @lock is a softirq-safe spinlock protecting @queue as well as
128 * @cur_slot, @mrq and @state. These must always be updated
129 * at the same time while holding @lock.
131 * @irq_lock is an irq-safe spinlock protecting the INTMASK register
132 * to allow the interrupt handler to modify it directly. Held for only long
133 * enough to read-modify-write INTMASK and no other locks are grabbed when
136 * The @mrq field of struct dw_mci_slot is also protected by @lock,
137 * and must always be written at the same time as the slot is added to
140 * @pending_events and @completed_events are accessed using atomic bit
141 * operations, so they don't need any locking.
143 * None of the fields touched by the interrupt handler need any
144 * locking. However, ordering is important: Before EVENT_DATA_ERROR or
145 * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
146 * interrupts must be disabled and @data_status updated with a
147 * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
148 * CMDRDY interrupt must be disabled and @cmd_status updated with a
149 * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
150 * bytes_xfered field of @data must be written. This is ensured by
157 void __iomem
*fifo_reg
;
159 struct scatterlist
*sg
;
160 struct sg_mapping_iter sg_miter
;
162 struct dw_mci_slot
*cur_slot
;
163 struct mmc_request
*mrq
;
164 struct mmc_command
*cmd
;
165 struct mmc_data
*data
;
166 struct mmc_command stop_abort
;
167 unsigned int prev_blksz
;
168 unsigned char timing
;
170 /* DMA interface members*/
173 int dma_64bit_address
;
177 const struct dw_mci_dma_ops
*dma_ops
;
179 unsigned int ring_size
;
182 struct dw_mci_dma_slave
*dms
;
183 /* Registers's physical base address */
184 resource_size_t phy_regs
;
190 struct tasklet_struct tasklet
;
191 unsigned long pending_events
;
192 unsigned long completed_events
;
193 enum dw_mci_state state
;
194 struct list_head queue
;
202 struct dw_mci_board
*pdata
;
203 const struct dw_mci_drv_data
*drv_data
;
207 struct dw_mci_slot
*slot
[MAX_MCI_SLOTS
];
209 /* FIFO push and pull */
219 void (*push_data
)(struct dw_mci
*host
, void *buf
, int cnt
);
220 void (*pull_data
)(struct dw_mci
*host
, void *buf
, int cnt
);
222 /* Workaround flags */
226 unsigned long irq_flags
; /* IRQ flags */
231 struct timer_list cmd11_timer
;
232 struct timer_list dto_timer
;
235 /* DMA ops for Internal/External DMAC interface */
236 struct dw_mci_dma_ops
{
238 int (*init
)(struct dw_mci
*host
);
239 int (*start
)(struct dw_mci
*host
, unsigned int sg_len
);
240 void (*complete
)(void *host
);
241 void (*stop
)(struct dw_mci
*host
);
242 void (*cleanup
)(struct dw_mci
*host
);
243 void (*exit
)(struct dw_mci
*host
);
246 /* IP Quirks/flags. */
247 /* Timer for broken data transfer over scheme */
248 #define DW_MCI_QUIRK_BROKEN_DTO BIT(0)
252 /* Board platform data */
253 struct dw_mci_board
{
256 u32 quirks
; /* Workaround / Quirk flags */
257 unsigned int bus_hz
; /* Clock speed at the cclk_in pad */
259 u32 caps
; /* Capabilities */
260 u32 caps2
; /* More capabilities */
261 u32 pm_caps
; /* PM capabilities */
263 * Override fifo depth. If 0, autodetect it from the FIFOTH register,
264 * but note that this may not be reliable after a bootloader has used
267 unsigned int fifo_depth
;
269 /* delay in mS before detecting cards after interrupt */
272 struct dw_mci_dma_ops
*dma_ops
;
273 struct dma_pdata
*data
;
276 #endif /* LINUX_MMC_DW_MMC_H */