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,
49 struct dw_mci_dma_slave {
51 enum dma_transfer_direction direction;
55 * struct dw_mci - MMC controller state shared between all slots
56 * @lock: Spinlock protecting the queue and associated data.
57 * @irq_lock: Spinlock protecting the INTMASK setting.
58 * @regs: Pointer to MMIO registers.
59 * @fifo_reg: Pointer to MMIO registers for data FIFO
60 * @sg: Scatterlist entry currently being processed by PIO code, if any.
61 * @sg_miter: PIO mapping scatterlist iterator.
62 * @cur_slot: The slot which is currently using the controller.
63 * @mrq: The request currently being processed on @cur_slot,
64 * or NULL if the controller is idle.
65 * @cmd: The command currently being sent to the card, or NULL.
66 * @data: The data currently being transferred, or NULL if no data
67 * transfer is in progress.
68 * @stop_abort: The command currently prepared for stoping transfer.
69 * @prev_blksz: The former transfer blksz record.
70 * @timing: Record of current ios timing.
71 * @use_dma: Whether DMA channel is initialized or not.
72 * @using_dma: Whether DMA is in use for the current transfer.
73 * @dma_64bit_address: Whether DMA supports 64-bit address mode or not.
74 * @sg_dma: Bus address of DMA buffer.
75 * @sg_cpu: Virtual address of DMA buffer.
76 * @dma_ops: Pointer to platform-specific DMA callbacks.
77 * @cmd_status: Snapshot of SR taken upon completion of the current
78 * @ring_size: Buffer size for idma descriptors.
79 * command. Only valid when EVENT_CMD_COMPLETE is pending.
80 * @dms: structure of slave-dma private data.
81 * @phy_regs: physical address of controller's register map
82 * @data_status: Snapshot of SR taken upon completion of the current
83 * data transfer. Only valid when EVENT_DATA_COMPLETE or
84 * EVENT_DATA_ERROR is pending.
85 * @stop_cmdr: Value to be loaded into CMDR when the stop command is
87 * @dir_status: Direction of current transfer.
88 * @tasklet: Tasklet running the request state machine.
89 * @pending_events: Bitmask of events flagged by the interrupt handler
90 * to be processed by the tasklet.
91 * @completed_events: Bitmask of events which the state machine has
93 * @state: Tasklet state.
94 * @queue: List of slots waiting for access to the controller.
95 * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
96 * rate and timeout calculations.
97 * @current_speed: Configured rate of the controller.
98 * @num_slots: Number of slots available.
99 * @fifoth_val: The value of FIFOTH register.
100 * @verid: Denote Version ID.
101 * @dev: Device associated with the MMC controller.
102 * @pdata: Platform data associated with the MMC controller.
103 * @drv_data: Driver specific data for identified variant of the controller
104 * @priv: Implementation defined private data.
105 * @biu_clk: Pointer to bus interface unit clock instance.
106 * @ciu_clk: Pointer to card interface unit clock instance.
107 * @slot: Slots sharing this MMC controller.
108 * @fifo_depth: depth of FIFO.
109 * @data_shift: log2 of FIFO item size.
110 * @part_buf_start: Start index in part_buf.
111 * @part_buf_count: Bytes of partial data in part_buf.
112 * @part_buf: Simple buffer for partial fifo reads/writes.
113 * @push_data: Pointer to FIFO push function.
114 * @pull_data: Pointer to FIFO pull function.
115 * @vqmmc_enabled: Status of vqmmc, should be true or false.
116 * @irq_flags: The flags to be passed to request_irq.
117 * @irq: The irq value to be passed to request_irq.
118 * @sdio_id0: Number of slot0 in the SDIO interrupt registers.
119 * @cmd11_timer: Timer for SD3.0 voltage switch over scheme.
120 * @dto_timer: Timer for broken data transfer over scheme.
125 * @lock is a softirq-safe spinlock protecting @queue as well as
126 * @cur_slot, @mrq and @state. These must always be updated
127 * at the same time while holding @lock.
129 * @irq_lock is an irq-safe spinlock protecting the INTMASK register
130 * to allow the interrupt handler to modify it directly. Held for only long
131 * enough to read-modify-write INTMASK and no other locks are grabbed when
134 * The @mrq field of struct dw_mci_slot is also protected by @lock,
135 * and must always be written at the same time as the slot is added to
138 * @pending_events and @completed_events are accessed using atomic bit
139 * operations, so they don't need any locking.
141 * None of the fields touched by the interrupt handler need any
142 * locking. However, ordering is important: Before EVENT_DATA_ERROR or
143 * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
144 * interrupts must be disabled and @data_status updated with a
145 * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
146 * CMDRDY interrupt must be disabled and @cmd_status updated with a
147 * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
148 * bytes_xfered field of @data must be written. This is ensured by
155 void __iomem *fifo_reg;
157 struct scatterlist *sg;
158 struct sg_mapping_iter sg_miter;
160 struct dw_mci_slot *cur_slot;
161 struct mmc_request *mrq;
162 struct mmc_command *cmd;
163 struct mmc_data *data;
164 struct mmc_command stop_abort;
165 unsigned int prev_blksz;
166 unsigned char timing;
168 /* DMA interface members*/
171 int dma_64bit_address;
175 const struct dw_mci_dma_ops *dma_ops;
177 unsigned int ring_size;
180 struct dw_mci_dma_slave *dms;
181 /* Registers's physical base address */
182 resource_size_t phy_regs;
188 struct tasklet_struct tasklet;
189 unsigned long pending_events;
190 unsigned long completed_events;
191 enum dw_mci_state state;
192 struct list_head queue;
200 struct dw_mci_board *pdata;
201 const struct dw_mci_drv_data *drv_data;
205 struct dw_mci_slot *slot[MAX_MCI_SLOTS];
207 /* FIFO push and pull */
217 void (*push_data)(struct dw_mci *host, void *buf, int cnt);
218 void (*pull_data)(struct dw_mci *host, void *buf, int cnt);
221 unsigned long irq_flags; /* IRQ flags */
226 struct timer_list cmd11_timer;
227 struct timer_list dto_timer;
230 /* DMA ops for Internal/External DMAC interface */
231 struct dw_mci_dma_ops {
233 int (*init)(struct dw_mci *host);
234 int (*start)(struct dw_mci *host, unsigned int sg_len);
235 void (*complete)(void *host);
236 void (*stop)(struct dw_mci *host);
237 void (*cleanup)(struct dw_mci *host);
238 void (*exit)(struct dw_mci *host);
243 /* Board platform data */
244 struct dw_mci_board {
247 unsigned int bus_hz; /* Clock speed at the cclk_in pad */
249 u32 caps; /* Capabilities */
250 u32 caps2; /* More capabilities */
251 u32 pm_caps; /* PM capabilities */
253 * Override fifo depth. If 0, autodetect it from the FIFOTH register,
254 * but note that this may not be reliable after a bootloader has used
257 unsigned int fifo_depth;
259 /* delay in mS before detecting cards after interrupt */
262 struct dw_mci_dma_ops *dma_ops;
263 struct dma_pdata *data;
266 #endif /* LINUX_MMC_DW_MMC_H */