590 lines
19 KiB
C
590 lines
19 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Synopsys DesignWare Multimedia Card Interface driver
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* (Based on NXP driver for lpc 31xx)
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*
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* Copyright (C) 2009 NXP Semiconductors
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* Copyright (C) 2009, 2010 Imagination Technologies Ltd.
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*/
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#ifndef _DW_MMC_H_
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#define _DW_MMC_H_
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#include <linux/scatterlist.h>
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#include <linux/mmc/core.h>
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#include <linux/dmaengine.h>
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#include <linux/reset.h>
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#include <linux/fault-inject.h>
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#include <linux/hrtimer.h>
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#include <linux/interrupt.h>
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enum dw_mci_state {
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STATE_IDLE = 0,
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STATE_SENDING_CMD,
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STATE_SENDING_DATA,
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STATE_DATA_BUSY,
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STATE_SENDING_STOP,
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STATE_DATA_ERROR,
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STATE_SENDING_CMD11,
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STATE_WAITING_CMD11_DONE,
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};
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enum {
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EVENT_CMD_COMPLETE = 0,
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EVENT_XFER_COMPLETE,
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EVENT_DATA_COMPLETE,
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EVENT_DATA_ERROR,
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};
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enum dw_mci_cookie {
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COOKIE_UNMAPPED,
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COOKIE_PRE_MAPPED, /* mapped by pre_req() of dwmmc */
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COOKIE_MAPPED, /* mapped by prepare_data() of dwmmc */
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};
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struct mmc_data;
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enum {
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TRANS_MODE_PIO = 0,
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TRANS_MODE_IDMAC,
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TRANS_MODE_EDMAC
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};
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struct dw_mci_dma_slave {
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struct dma_chan *ch;
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enum dma_transfer_direction direction;
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};
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/**
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* struct dw_mci - MMC controller state shared between all slots
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* @lock: Spinlock protecting the queue and associated data.
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* @irq_lock: Spinlock protecting the INTMASK setting.
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* @regs: Pointer to MMIO registers.
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* @fifo_reg: Pointer to MMIO registers for data FIFO
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* @sg: Scatterlist entry currently being processed by PIO code, if any.
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* @sg_miter: PIO mapping scatterlist iterator.
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* @mrq: The request currently being processed on @slot,
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* or NULL if the controller is idle.
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* @cmd: The command currently being sent to the card, or NULL.
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* @data: The data currently being transferred, or NULL if no data
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* transfer is in progress.
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* @stop_abort: The command currently prepared for stoping transfer.
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* @prev_blksz: The former transfer blksz record.
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* @timing: Record of current ios timing.
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* @use_dma: Which DMA channel is in use for the current transfer, zero
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* denotes PIO mode.
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* @using_dma: Whether DMA is in use for the current transfer.
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* @dma_64bit_address: Whether DMA supports 64-bit address mode or not.
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* @sg_dma: Bus address of DMA buffer.
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* @sg_cpu: Virtual address of DMA buffer.
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* @dma_ops: Pointer to platform-specific DMA callbacks.
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* @cmd_status: Snapshot of SR taken upon completion of the current
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* @ring_size: Buffer size for idma descriptors.
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* command. Only valid when EVENT_CMD_COMPLETE is pending.
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* @dms: structure of slave-dma private data.
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* @phy_regs: physical address of controller's register map
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* @data_status: Snapshot of SR taken upon completion of the current
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* data transfer. Only valid when EVENT_DATA_COMPLETE or
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* EVENT_DATA_ERROR is pending.
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* @stop_cmdr: Value to be loaded into CMDR when the stop command is
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* to be sent.
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* @dir_status: Direction of current transfer.
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* @tasklet: Tasklet running the request state machine.
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* @pending_events: Bitmask of events flagged by the interrupt handler
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* to be processed by the tasklet.
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* @completed_events: Bitmask of events which the state machine has
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* processed.
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* @state: Tasklet state.
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* @queue: List of slots waiting for access to the controller.
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* @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
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* rate and timeout calculations.
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* @current_speed: Configured rate of the controller.
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* @minimum_speed: Stored minimum rate of the controller.
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* @fifoth_val: The value of FIFOTH register.
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* @verid: Denote Version ID.
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* @dev: Device associated with the MMC controller.
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* @pdata: Platform data associated with the MMC controller.
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* @drv_data: Driver specific data for identified variant of the controller
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* @priv: Implementation defined private data.
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* @biu_clk: Pointer to bus interface unit clock instance.
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* @ciu_clk: Pointer to card interface unit clock instance.
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* @slot: Slots sharing this MMC controller.
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* @fifo_depth: depth of FIFO.
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* @data_addr_override: override fifo reg offset with this value.
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* @wm_aligned: force fifo watermark equal with data length in PIO mode.
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* Set as true if alignment is needed.
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* @data_shift: log2 of FIFO item size.
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* @part_buf_start: Start index in part_buf.
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* @part_buf_count: Bytes of partial data in part_buf.
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* @part_buf: Simple buffer for partial fifo reads/writes.
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* @push_data: Pointer to FIFO push function.
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* @pull_data: Pointer to FIFO pull function.
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* @quirks: Set of quirks that apply to specific versions of the IP.
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* @vqmmc_enabled: Status of vqmmc, should be true or false.
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* @irq_flags: The flags to be passed to request_irq.
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* @irq: The irq value to be passed to request_irq.
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* @sdio_id0: Number of slot0 in the SDIO interrupt registers.
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* @cmd11_timer: Timer for SD3.0 voltage switch over scheme.
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* @cto_timer: Timer for broken command transfer over scheme.
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* @dto_timer: Timer for broken data transfer over scheme.
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*
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* Locking
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* =======
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*
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* @lock is a softirq-safe spinlock protecting @queue as well as
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* @slot, @mrq and @state. These must always be updated
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* at the same time while holding @lock.
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* The @mrq field of struct dw_mci_slot is also protected by @lock,
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* and must always be written at the same time as the slot is added to
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* @queue.
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*
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* @irq_lock is an irq-safe spinlock protecting the INTMASK register
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* to allow the interrupt handler to modify it directly. Held for only long
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* enough to read-modify-write INTMASK and no other locks are grabbed when
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* holding this one.
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*
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* @pending_events and @completed_events are accessed using atomic bit
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* operations, so they don't need any locking.
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*
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* None of the fields touched by the interrupt handler need any
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* locking. However, ordering is important: Before EVENT_DATA_ERROR or
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* EVENT_DATA_COMPLETE is set in @pending_events, all data-related
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* interrupts must be disabled and @data_status updated with a
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* snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
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* CMDRDY interrupt must be disabled and @cmd_status updated with a
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* snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
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* bytes_xfered field of @data must be written. This is ensured by
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* using barriers.
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*/
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struct dw_mci {
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spinlock_t lock;
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spinlock_t irq_lock;
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void __iomem *regs;
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void __iomem *fifo_reg;
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u32 data_addr_override;
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bool wm_aligned;
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struct scatterlist *sg;
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struct sg_mapping_iter sg_miter;
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struct mmc_request *mrq;
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struct mmc_command *cmd;
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struct mmc_data *data;
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struct mmc_command stop_abort;
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unsigned int prev_blksz;
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unsigned char timing;
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/* DMA interface members*/
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int use_dma;
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int using_dma;
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int dma_64bit_address;
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dma_addr_t sg_dma;
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void *sg_cpu;
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const struct dw_mci_dma_ops *dma_ops;
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/* For idmac */
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unsigned int ring_size;
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/* For edmac */
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struct dw_mci_dma_slave *dms;
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/* Registers's physical base address */
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resource_size_t phy_regs;
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u32 cmd_status;
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u32 data_status;
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u32 stop_cmdr;
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u32 dir_status;
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struct tasklet_struct tasklet;
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unsigned long pending_events;
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unsigned long completed_events;
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enum dw_mci_state state;
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struct list_head queue;
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u32 bus_hz;
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u32 current_speed;
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u32 minimum_speed;
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u32 fifoth_val;
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u16 verid;
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struct device *dev;
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struct dw_mci_board *pdata;
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const struct dw_mci_drv_data *drv_data;
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void *priv;
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struct clk *biu_clk;
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struct clk *ciu_clk;
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struct dw_mci_slot *slot;
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/* FIFO push and pull */
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int fifo_depth;
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int data_shift;
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u8 part_buf_start;
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u8 part_buf_count;
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union {
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u16 part_buf16;
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u32 part_buf32;
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u64 part_buf;
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};
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void (*push_data)(struct dw_mci *host, void *buf, int cnt);
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void (*pull_data)(struct dw_mci *host, void *buf, int cnt);
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u32 quirks;
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bool vqmmc_enabled;
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unsigned long irq_flags; /* IRQ flags */
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int irq;
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int sdio_id0;
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struct timer_list cmd11_timer;
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struct timer_list cto_timer;
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struct timer_list dto_timer;
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#ifdef CONFIG_FAULT_INJECTION
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struct fault_attr fail_data_crc;
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struct hrtimer fault_timer;
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#endif
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};
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/* DMA ops for Internal/External DMAC interface */
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struct dw_mci_dma_ops {
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/* DMA Ops */
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int (*init)(struct dw_mci *host);
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int (*start)(struct dw_mci *host, unsigned int sg_len);
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void (*complete)(void *host);
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void (*stop)(struct dw_mci *host);
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void (*cleanup)(struct dw_mci *host);
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void (*exit)(struct dw_mci *host);
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};
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struct dma_pdata;
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/* Board platform data */
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struct dw_mci_board {
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unsigned int bus_hz; /* Clock speed at the cclk_in pad */
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u32 caps; /* Capabilities */
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u32 caps2; /* More capabilities */
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u32 pm_caps; /* PM capabilities */
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/*
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* Override fifo depth. If 0, autodetect it from the FIFOTH register,
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* but note that this may not be reliable after a bootloader has used
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* it.
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*/
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unsigned int fifo_depth;
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/* delay in mS before detecting cards after interrupt */
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u32 detect_delay_ms;
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struct reset_control *rstc;
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struct dw_mci_dma_ops *dma_ops;
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struct dma_pdata *data;
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};
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/* Support for longer data read timeout */
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#define DW_MMC_QUIRK_EXTENDED_TMOUT BIT(0)
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#define DW_MMC_240A 0x240a
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#define DW_MMC_280A 0x280a
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#define SDMMC_CTRL 0x000
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#define SDMMC_PWREN 0x004
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#define SDMMC_CLKDIV 0x008
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#define SDMMC_CLKSRC 0x00c
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#define SDMMC_CLKENA 0x010
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#define SDMMC_TMOUT 0x014
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#define SDMMC_CTYPE 0x018
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#define SDMMC_BLKSIZ 0x01c
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#define SDMMC_BYTCNT 0x020
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#define SDMMC_INTMASK 0x024
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#define SDMMC_CMDARG 0x028
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#define SDMMC_CMD 0x02c
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#define SDMMC_RESP0 0x030
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#define SDMMC_RESP1 0x034
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#define SDMMC_RESP2 0x038
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#define SDMMC_RESP3 0x03c
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#define SDMMC_MINTSTS 0x040
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#define SDMMC_RINTSTS 0x044
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#define SDMMC_STATUS 0x048
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#define SDMMC_FIFOTH 0x04c
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#define SDMMC_CDETECT 0x050
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#define SDMMC_WRTPRT 0x054
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#define SDMMC_GPIO 0x058
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#define SDMMC_TCBCNT 0x05c
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#define SDMMC_TBBCNT 0x060
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#define SDMMC_DEBNCE 0x064
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#define SDMMC_USRID 0x068
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#define SDMMC_VERID 0x06c
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#define SDMMC_HCON 0x070
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#define SDMMC_UHS_REG 0x074
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#define SDMMC_RST_N 0x078
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#define SDMMC_BMOD 0x080
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#define SDMMC_PLDMND 0x084
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#define SDMMC_DBADDR 0x088
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#define SDMMC_IDSTS 0x08c
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#define SDMMC_IDINTEN 0x090
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#define SDMMC_DSCADDR 0x094
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#define SDMMC_BUFADDR 0x098
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#define SDMMC_CDTHRCTL 0x100
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#define SDMMC_UHS_REG_EXT 0x108
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#define SDMMC_DDR_REG 0x10c
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#define SDMMC_ENABLE_SHIFT 0x110
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#define SDMMC_DATA(x) (x)
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/*
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* Registers to support idmac 64-bit address mode
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*/
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#define SDMMC_DBADDRL 0x088
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#define SDMMC_DBADDRU 0x08c
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#define SDMMC_IDSTS64 0x090
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#define SDMMC_IDINTEN64 0x094
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#define SDMMC_DSCADDRL 0x098
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#define SDMMC_DSCADDRU 0x09c
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#define SDMMC_BUFADDRL 0x0A0
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#define SDMMC_BUFADDRU 0x0A4
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/*
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* Data offset is difference according to Version
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* Lower than 2.40a : data register offest is 0x100
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*/
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#define DATA_OFFSET 0x100
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#define DATA_240A_OFFSET 0x200
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/* shift bit field */
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#define _SBF(f, v) ((v) << (f))
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/* Control register defines */
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#define SDMMC_CTRL_USE_IDMAC BIT(25)
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#define SDMMC_CTRL_CEATA_INT_EN BIT(11)
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#define SDMMC_CTRL_SEND_AS_CCSD BIT(10)
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#define SDMMC_CTRL_SEND_CCSD BIT(9)
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#define SDMMC_CTRL_ABRT_READ_DATA BIT(8)
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#define SDMMC_CTRL_SEND_IRQ_RESP BIT(7)
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#define SDMMC_CTRL_READ_WAIT BIT(6)
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#define SDMMC_CTRL_DMA_ENABLE BIT(5)
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#define SDMMC_CTRL_INT_ENABLE BIT(4)
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#define SDMMC_CTRL_DMA_RESET BIT(2)
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#define SDMMC_CTRL_FIFO_RESET BIT(1)
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#define SDMMC_CTRL_RESET BIT(0)
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/* Clock Enable register defines */
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#define SDMMC_CLKEN_LOW_PWR BIT(16)
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#define SDMMC_CLKEN_ENABLE BIT(0)
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/* time-out register defines */
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#define SDMMC_TMOUT_DATA(n) _SBF(8, (n))
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#define SDMMC_TMOUT_DATA_MSK 0xFFFFFF00
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#define SDMMC_TMOUT_RESP(n) ((n) & 0xFF)
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#define SDMMC_TMOUT_RESP_MSK 0xFF
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/* card-type register defines */
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#define SDMMC_CTYPE_8BIT BIT(16)
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#define SDMMC_CTYPE_4BIT BIT(0)
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#define SDMMC_CTYPE_1BIT 0
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/* Interrupt status & mask register defines */
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#define SDMMC_INT_SDIO(n) BIT(16 + (n))
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#define SDMMC_INT_EBE BIT(15)
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#define SDMMC_INT_ACD BIT(14)
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#define SDMMC_INT_SBE BIT(13)
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#define SDMMC_INT_HLE BIT(12)
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#define SDMMC_INT_FRUN BIT(11)
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#define SDMMC_INT_HTO BIT(10)
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#define SDMMC_INT_VOLT_SWITCH BIT(10) /* overloads bit 10! */
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#define SDMMC_INT_DRTO BIT(9)
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#define SDMMC_INT_RTO BIT(8)
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#define SDMMC_INT_DCRC BIT(7)
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#define SDMMC_INT_RCRC BIT(6)
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#define SDMMC_INT_RXDR BIT(5)
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#define SDMMC_INT_TXDR BIT(4)
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#define SDMMC_INT_DATA_OVER BIT(3)
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#define SDMMC_INT_CMD_DONE BIT(2)
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#define SDMMC_INT_RESP_ERR BIT(1)
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#define SDMMC_INT_CD BIT(0)
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#define SDMMC_INT_ERROR 0xbfc2
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/* Command register defines */
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#define SDMMC_CMD_START BIT(31)
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#define SDMMC_CMD_USE_HOLD_REG BIT(29)
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#define SDMMC_CMD_VOLT_SWITCH BIT(28)
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#define SDMMC_CMD_CCS_EXP BIT(23)
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#define SDMMC_CMD_CEATA_RD BIT(22)
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#define SDMMC_CMD_UPD_CLK BIT(21)
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#define SDMMC_CMD_INIT BIT(15)
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#define SDMMC_CMD_STOP BIT(14)
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#define SDMMC_CMD_PRV_DAT_WAIT BIT(13)
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#define SDMMC_CMD_SEND_STOP BIT(12)
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#define SDMMC_CMD_STRM_MODE BIT(11)
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#define SDMMC_CMD_DAT_WR BIT(10)
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#define SDMMC_CMD_DAT_EXP BIT(9)
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#define SDMMC_CMD_RESP_CRC BIT(8)
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#define SDMMC_CMD_RESP_LONG BIT(7)
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#define SDMMC_CMD_RESP_EXP BIT(6)
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#define SDMMC_CMD_INDX(n) ((n) & 0x1F)
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/* Status register defines */
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#define SDMMC_GET_FCNT(x) (((x)>>17) & 0x1FFF)
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#define SDMMC_STATUS_DMA_REQ BIT(31)
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#define SDMMC_STATUS_BUSY BIT(9)
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/* FIFOTH register defines */
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#define SDMMC_SET_FIFOTH(m, r, t) (((m) & 0x7) << 28 | \
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((r) & 0xFFF) << 16 | \
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((t) & 0xFFF))
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/* HCON register defines */
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#define DMA_INTERFACE_IDMA (0x0)
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#define DMA_INTERFACE_DWDMA (0x1)
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#define DMA_INTERFACE_GDMA (0x2)
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#define DMA_INTERFACE_NODMA (0x3)
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#define SDMMC_GET_TRANS_MODE(x) (((x)>>16) & 0x3)
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#define SDMMC_GET_SLOT_NUM(x) ((((x)>>1) & 0x1F) + 1)
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#define SDMMC_GET_HDATA_WIDTH(x) (((x)>>7) & 0x7)
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#define SDMMC_GET_ADDR_CONFIG(x) (((x)>>27) & 0x1)
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/* Internal DMAC interrupt defines */
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#define SDMMC_IDMAC_INT_AI BIT(9)
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#define SDMMC_IDMAC_INT_NI BIT(8)
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#define SDMMC_IDMAC_INT_CES BIT(5)
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#define SDMMC_IDMAC_INT_DU BIT(4)
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#define SDMMC_IDMAC_INT_FBE BIT(2)
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#define SDMMC_IDMAC_INT_RI BIT(1)
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#define SDMMC_IDMAC_INT_TI BIT(0)
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/* Internal DMAC bus mode bits */
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#define SDMMC_IDMAC_ENABLE BIT(7)
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#define SDMMC_IDMAC_FB BIT(1)
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#define SDMMC_IDMAC_SWRESET BIT(0)
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/* H/W reset */
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#define SDMMC_RST_HWACTIVE 0x1
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/* Version ID register define */
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#define SDMMC_GET_VERID(x) ((x) & 0xFFFF)
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/* Card read threshold */
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#define SDMMC_SET_THLD(v, x) (((v) & 0xFFF) << 16 | (x))
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#define SDMMC_CARD_WR_THR_EN BIT(2)
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#define SDMMC_CARD_RD_THR_EN BIT(0)
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/* UHS-1 register defines */
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#define SDMMC_UHS_DDR BIT(16)
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#define SDMMC_UHS_18V BIT(0)
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/* DDR register defines */
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#define SDMMC_DDR_HS400 BIT(31)
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/* Enable shift register defines */
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#define SDMMC_ENABLE_PHASE BIT(0)
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/* All ctrl reset bits */
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#define SDMMC_CTRL_ALL_RESET_FLAGS \
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(SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET | SDMMC_CTRL_DMA_RESET)
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/* FIFO register access macros. These should not change the data endian-ness
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* as they are written to memory to be dealt with by the upper layers
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*/
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#define mci_fifo_readw(__reg) __raw_readw(__reg)
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#define mci_fifo_readl(__reg) __raw_readl(__reg)
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#define mci_fifo_readq(__reg) __raw_readq(__reg)
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#define mci_fifo_writew(__value, __reg) __raw_writew(__reg, __value)
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#define mci_fifo_writel(__value, __reg) __raw_writel(__reg, __value)
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#define mci_fifo_writeq(__value, __reg) __raw_writeq(__reg, __value)
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|
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/* Register access macros */
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#define mci_readl(dev, reg) \
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readl_relaxed((dev)->regs + SDMMC_##reg)
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#define mci_writel(dev, reg, value) \
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writel_relaxed((value), (dev)->regs + SDMMC_##reg)
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/* 16-bit FIFO access macros */
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#define mci_readw(dev, reg) \
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readw_relaxed((dev)->regs + SDMMC_##reg)
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#define mci_writew(dev, reg, value) \
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writew_relaxed((value), (dev)->regs + SDMMC_##reg)
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|
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/* 64-bit FIFO access macros */
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#ifdef readq
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#define mci_readq(dev, reg) \
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readq_relaxed((dev)->regs + SDMMC_##reg)
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#define mci_writeq(dev, reg, value) \
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writeq_relaxed((value), (dev)->regs + SDMMC_##reg)
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#else
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/*
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* Dummy readq implementation for architectures that don't define it.
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|
*
|
|
* We would assume that none of these architectures would configure
|
|
* the IP block with a 64bit FIFO width, so this code will never be
|
|
* executed on those machines. Defining these macros here keeps the
|
|
* rest of the code free from ifdefs.
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|
*/
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#define mci_readq(dev, reg) \
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(*(volatile u64 __force *)((dev)->regs + SDMMC_##reg))
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#define mci_writeq(dev, reg, value) \
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(*(volatile u64 __force *)((dev)->regs + SDMMC_##reg) = (value))
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|
|
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#define __raw_writeq(__value, __reg) \
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|
(*(volatile u64 __force *)(__reg) = (__value))
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#define __raw_readq(__reg) (*(volatile u64 __force *)(__reg))
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|
#endif
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|
|
extern int dw_mci_probe(struct dw_mci *host);
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|
extern void dw_mci_remove(struct dw_mci *host);
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|
#ifdef CONFIG_PM
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|
extern int dw_mci_runtime_suspend(struct device *device);
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|
extern int dw_mci_runtime_resume(struct device *device);
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|
#endif
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|
|
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/**
|
|
* struct dw_mci_slot - MMC slot state
|
|
* @mmc: The mmc_host representing this slot.
|
|
* @host: The MMC controller this slot is using.
|
|
* @ctype: Card type for this slot.
|
|
* @mrq: mmc_request currently being processed or waiting to be
|
|
* processed, or NULL when the slot is idle.
|
|
* @queue_node: List node for placing this node in the @queue list of
|
|
* &struct dw_mci.
|
|
* @clock: Clock rate configured by set_ios(). Protected by host->lock.
|
|
* @__clk_old: The last clock value that was requested from core.
|
|
* Keeping track of this helps us to avoid spamming the console.
|
|
* @flags: Random state bits associated with the slot.
|
|
* @id: Number of this slot.
|
|
* @sdio_id: Number of this slot in the SDIO interrupt registers.
|
|
*/
|
|
struct dw_mci_slot {
|
|
struct mmc_host *mmc;
|
|
struct dw_mci *host;
|
|
|
|
u32 ctype;
|
|
|
|
struct mmc_request *mrq;
|
|
struct list_head queue_node;
|
|
|
|
unsigned int clock;
|
|
unsigned int __clk_old;
|
|
|
|
unsigned long flags;
|
|
#define DW_MMC_CARD_PRESENT 0
|
|
#define DW_MMC_CARD_NEED_INIT 1
|
|
#define DW_MMC_CARD_NO_LOW_PWR 2
|
|
#define DW_MMC_CARD_NO_USE_HOLD 3
|
|
#define DW_MMC_CARD_NEEDS_POLL 4
|
|
int id;
|
|
int sdio_id;
|
|
};
|
|
|
|
/**
|
|
* dw_mci driver data - dw-mshc implementation specific driver data.
|
|
* @caps: mmc subsystem specified capabilities of the controller(s).
|
|
* @num_caps: number of capabilities specified by @caps.
|
|
* @common_caps: mmc subsystem specified capabilities applicable to all of
|
|
* the controllers
|
|
* @init: early implementation specific initialization.
|
|
* @set_ios: handle bus specific extensions.
|
|
* @parse_dt: parse implementation specific device tree properties.
|
|
* @execute_tuning: implementation specific tuning procedure.
|
|
* @set_data_timeout: implementation specific timeout.
|
|
* @get_drto_clks: implementation specific cycle count for data read timeout.
|
|
*
|
|
* Provide controller implementation specific extensions. The usage of this
|
|
* data structure is fully optional and usage of each member in this structure
|
|
* is optional as well.
|
|
*/
|
|
struct dw_mci_drv_data {
|
|
unsigned long *caps;
|
|
u32 num_caps;
|
|
u32 common_caps;
|
|
int (*init)(struct dw_mci *host);
|
|
void (*set_ios)(struct dw_mci *host, struct mmc_ios *ios);
|
|
int (*parse_dt)(struct dw_mci *host);
|
|
int (*execute_tuning)(struct dw_mci_slot *slot, u32 opcode);
|
|
int (*prepare_hs400_tuning)(struct dw_mci *host,
|
|
struct mmc_ios *ios);
|
|
int (*switch_voltage)(struct mmc_host *mmc,
|
|
struct mmc_ios *ios);
|
|
void (*set_data_timeout)(struct dw_mci *host,
|
|
unsigned int timeout_ns);
|
|
u32 (*get_drto_clks)(struct dw_mci *host);
|
|
};
|
|
#endif /* _DW_MMC_H_ */
|