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linux/drivers/mmc/host/dw_mmc.h
Liming Sun f21adcb866 mmc: dw_mmc: Add support for platform specific eMMC HW reset 
This commit adds a new callback to allow drivers to support platform
specific eMMC HW reset.

Reviewed-by: David Thompson <davthompson@nvidia.com>
Signed-off-by: Liming Sun <limings@nvidia.com>
Link: https://lore.kernel.org/r/3df02ffa8bdaa74f5261c8914d2545b97fb3478a.1718213918.git.limings@nvidia.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2024-07-08 15:02:33 +02:00

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* 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.
*/
#ifndef _DW_MMC_H_
#define _DW_MMC_H_
#include <linux/scatterlist.h>
#include <linux/mmc/core.h>
#include <linux/dmaengine.h>
#include <linux/reset.h>
#include <linux/fault-inject.h>
#include <linux/hrtimer.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
enum dw_mci_state {
STATE_IDLE = 0,
STATE_SENDING_CMD,
STATE_SENDING_DATA,
STATE_DATA_BUSY,
STATE_SENDING_STOP,
STATE_DATA_ERROR,
STATE_SENDING_CMD11,
STATE_WAITING_CMD11_DONE,
};
enum {
EVENT_CMD_COMPLETE = 0,
EVENT_XFER_COMPLETE,
EVENT_DATA_COMPLETE,
EVENT_DATA_ERROR,
};
enum dw_mci_cookie {
COOKIE_UNMAPPED,
COOKIE_PRE_MAPPED, /* mapped by pre_req() of dwmmc */
COOKIE_MAPPED, /* mapped by prepare_data() of dwmmc */
};
struct mmc_data;
enum {
TRANS_MODE_PIO = 0,
TRANS_MODE_IDMAC,
TRANS_MODE_EDMAC
};
struct dw_mci_dma_slave {
struct dma_chan *ch;
enum dma_transfer_direction direction;
};
/**
* struct dw_mci - MMC controller state shared between all slots
* @lock: Spinlock protecting the queue and associated data.
* @irq_lock: Spinlock protecting the INTMASK setting.
* @regs: Pointer to MMIO registers.
* @fifo_reg: Pointer to MMIO registers for data FIFO
* @sg: Scatterlist entry currently being processed by PIO code, if any.
* @sg_miter: PIO mapping scatterlist iterator.
* @mrq: The request currently being processed on @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.
* @stop_abort: The command currently prepared for stoping transfer.
* @prev_blksz: The former transfer blksz record.
* @timing: Record of current ios timing.
* @use_dma: Which DMA channel is in use for the current transfer, zero
* denotes PIO mode.
* @using_dma: Whether DMA is in use for the current transfer.
* @dma_64bit_address: Whether DMA supports 64-bit address mode or not.
* @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
* @ring_size: Buffer size for idma descriptors.
* command. Only valid when EVENT_CMD_COMPLETE is pending.
* @dms: structure of slave-dma private data.
* @phy_regs: physical address of controller's register map
* @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.
* @bh_work: Work running the request state machine.
* @pending_events: Bitmask of events flagged by the interrupt handler
* to be processed by bh work.
* @completed_events: Bitmask of events which the state machine has
* processed.
* @state: BH work 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.
* @minimum_speed: Stored minimum rate of the controller.
* @fifoth_val: The value of FIFOTH register.
* @verid: Denote Version ID.
* @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_addr_override: override fifo reg offset with this value.
* @wm_aligned: force fifo watermark equal with data length in PIO mode.
* Set as true if alignment is needed.
* @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.
* @vqmmc_enabled: Status of vqmmc, should be true or false.
* @irq_flags: The flags to be passed to request_irq.
* @irq: The irq value to be passed to request_irq.
* @sdio_id0: Number of slot0 in the SDIO interrupt registers.
* @cmd11_timer: Timer for SD3.0 voltage switch over scheme.
* @cto_timer: Timer for broken command transfer over scheme.
* @dto_timer: Timer for broken data transfer over scheme.
*
* Locking
* =======
*
* @lock is a softirq-safe spinlock protecting @queue as well as
* @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.
*
* @irq_lock is an irq-safe spinlock protecting the INTMASK register
* to allow the interrupt handler to modify it directly. Held for only long
* enough to read-modify-write INTMASK and no other locks are grabbed when
* holding this one.
*
* @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;
spinlock_t irq_lock;
void __iomem *regs;
void __iomem *fifo_reg;
u32 data_addr_override;
bool wm_aligned;
struct scatterlist *sg;
struct sg_mapping_iter sg_miter;
struct mmc_request *mrq;
struct mmc_command *cmd;
struct mmc_data *data;
struct mmc_command stop_abort;
unsigned int prev_blksz;
unsigned char timing;
/* DMA interface members*/
int use_dma;
int using_dma;
int dma_64bit_address;
dma_addr_t sg_dma;
void *sg_cpu;
const struct dw_mci_dma_ops *dma_ops;
/* For idmac */
unsigned int ring_size;
/* For edmac */
struct dw_mci_dma_slave *dms;
/* Registers's physical base address */
resource_size_t phy_regs;
u32 cmd_status;
u32 data_status;
u32 stop_cmdr;
u32 dir_status;
struct work_struct bh_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 minimum_speed;
u32 fifoth_val;
u16 verid;
struct device *dev;
struct dw_mci_board *pdata;
const struct dw_mci_drv_data *drv_data;
void *priv;
struct clk *biu_clk;
struct clk *ciu_clk;
struct dw_mci_slot *slot;
/* 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);
u32 quirks;
bool vqmmc_enabled;
unsigned long irq_flags; /* IRQ flags */
int irq;
int sdio_id0;
struct timer_list cmd11_timer;
struct timer_list cto_timer;
struct timer_list dto_timer;
#ifdef CONFIG_FAULT_INJECTION
struct fault_attr fail_data_crc;
struct hrtimer fault_timer;
#endif
};
/* DMA ops for Internal/External DMAC interface */
struct dw_mci_dma_ops {
/* DMA Ops */
int (*init)(struct dw_mci *host);
int (*start)(struct dw_mci *host, unsigned int sg_len);
void (*complete)(void *host);
void (*stop)(struct dw_mci *host);
void (*cleanup)(struct dw_mci *host);
void (*exit)(struct dw_mci *host);
};
struct dma_pdata;
/* Board platform data */
struct dw_mci_board {
unsigned int bus_hz; /* Clock speed at the cclk_in pad */
u32 caps; /* Capabilities */
u32 caps2; /* More capabilities */
u32 pm_caps; /* PM 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;
struct reset_control *rstc;
struct dw_mci_dma_ops *dma_ops;
struct dma_pdata *data;
};
/* Support for longer data read timeout */
#define DW_MMC_QUIRK_EXTENDED_TMOUT BIT(0)
#define DW_MMC_240A 0x240a
#define DW_MMC_280A 0x280a
#define SDMMC_CTRL 0x000
#define SDMMC_PWREN 0x004
#define SDMMC_CLKDIV 0x008
#define SDMMC_CLKSRC 0x00c
#define SDMMC_CLKENA 0x010
#define SDMMC_TMOUT 0x014
#define SDMMC_CTYPE 0x018
#define SDMMC_BLKSIZ 0x01c
#define SDMMC_BYTCNT 0x020
#define SDMMC_INTMASK 0x024
#define SDMMC_CMDARG 0x028
#define SDMMC_CMD 0x02c
#define SDMMC_RESP0 0x030
#define SDMMC_RESP1 0x034
#define SDMMC_RESP2 0x038
#define SDMMC_RESP3 0x03c
#define SDMMC_MINTSTS 0x040
#define SDMMC_RINTSTS 0x044
#define SDMMC_STATUS 0x048
#define SDMMC_FIFOTH 0x04c
#define SDMMC_CDETECT 0x050
#define SDMMC_WRTPRT 0x054
#define SDMMC_GPIO 0x058
#define SDMMC_TCBCNT 0x05c
#define SDMMC_TBBCNT 0x060
#define SDMMC_DEBNCE 0x064
#define SDMMC_USRID 0x068
#define SDMMC_VERID 0x06c
#define SDMMC_HCON 0x070
#define SDMMC_UHS_REG 0x074
#define SDMMC_RST_N 0x078
#define SDMMC_BMOD 0x080
#define SDMMC_PLDMND 0x084
#define SDMMC_DBADDR 0x088
#define SDMMC_IDSTS 0x08c
#define SDMMC_IDINTEN 0x090
#define SDMMC_DSCADDR 0x094
#define SDMMC_BUFADDR 0x098
#define SDMMC_CDTHRCTL 0x100
#define SDMMC_UHS_REG_EXT 0x108
#define SDMMC_DDR_REG 0x10c
#define SDMMC_ENABLE_SHIFT 0x110
#define SDMMC_DATA(x) (x)
/*
* Registers to support idmac 64-bit address mode
*/
#define SDMMC_DBADDRL 0x088
#define SDMMC_DBADDRU 0x08c
#define SDMMC_IDSTS64 0x090
#define SDMMC_IDINTEN64 0x094
#define SDMMC_DSCADDRL 0x098
#define SDMMC_DSCADDRU 0x09c
#define SDMMC_BUFADDRL 0x0A0
#define SDMMC_BUFADDRU 0x0A4
/*
* Data offset is difference according to Version
* Lower than 2.40a : data register offest is 0x100
*/
#define DATA_OFFSET 0x100
#define DATA_240A_OFFSET 0x200
/* shift bit field */
#define _SBF(f, v) ((v) << (f))
/* Control register defines */
#define SDMMC_CTRL_USE_IDMAC BIT(25)
#define SDMMC_CTRL_CEATA_INT_EN BIT(11)
#define SDMMC_CTRL_SEND_AS_CCSD BIT(10)
#define SDMMC_CTRL_SEND_CCSD BIT(9)
#define SDMMC_CTRL_ABRT_READ_DATA BIT(8)
#define SDMMC_CTRL_SEND_IRQ_RESP BIT(7)
#define SDMMC_CTRL_READ_WAIT BIT(6)
#define SDMMC_CTRL_DMA_ENABLE BIT(5)
#define SDMMC_CTRL_INT_ENABLE BIT(4)
#define SDMMC_CTRL_DMA_RESET BIT(2)
#define SDMMC_CTRL_FIFO_RESET BIT(1)
#define SDMMC_CTRL_RESET BIT(0)
/* Clock Enable register defines */
#define SDMMC_CLKEN_LOW_PWR BIT(16)
#define SDMMC_CLKEN_ENABLE BIT(0)
/* time-out register defines */
#define SDMMC_TMOUT_DATA(n) _SBF(8, (n))
#define SDMMC_TMOUT_DATA_MSK 0xFFFFFF00
#define SDMMC_TMOUT_RESP(n) ((n) & 0xFF)
#define SDMMC_TMOUT_RESP_MSK 0xFF
/* card-type register defines */
#define SDMMC_CTYPE_8BIT BIT(16)
#define SDMMC_CTYPE_4BIT BIT(0)
#define SDMMC_CTYPE_1BIT 0
/* Interrupt status & mask register defines */
#define SDMMC_INT_SDIO(n) BIT(16 + (n))
#define SDMMC_INT_EBE BIT(15)
#define SDMMC_INT_ACD BIT(14)
#define SDMMC_INT_SBE BIT(13)
#define SDMMC_INT_HLE BIT(12)
#define SDMMC_INT_FRUN BIT(11)
#define SDMMC_INT_HTO BIT(10)
#define SDMMC_INT_VOLT_SWITCH BIT(10) /* overloads bit 10! */
#define SDMMC_INT_DRTO BIT(9)
#define SDMMC_INT_RTO BIT(8)
#define SDMMC_INT_DCRC BIT(7)
#define SDMMC_INT_RCRC BIT(6)
#define SDMMC_INT_RXDR BIT(5)
#define SDMMC_INT_TXDR BIT(4)
#define SDMMC_INT_DATA_OVER BIT(3)
#define SDMMC_INT_CMD_DONE BIT(2)
#define SDMMC_INT_RESP_ERR BIT(1)
#define SDMMC_INT_CD BIT(0)
#define SDMMC_INT_ERROR 0xbfc2
/* Command register defines */
#define SDMMC_CMD_START BIT(31)
#define SDMMC_CMD_USE_HOLD_REG BIT(29)
#define SDMMC_CMD_VOLT_SWITCH BIT(28)
#define SDMMC_CMD_CCS_EXP BIT(23)
#define SDMMC_CMD_CEATA_RD BIT(22)
#define SDMMC_CMD_UPD_CLK BIT(21)
#define SDMMC_CMD_INIT BIT(15)
#define SDMMC_CMD_STOP BIT(14)
#define SDMMC_CMD_PRV_DAT_WAIT BIT(13)
#define SDMMC_CMD_SEND_STOP BIT(12)
#define SDMMC_CMD_STRM_MODE BIT(11)
#define SDMMC_CMD_DAT_WR BIT(10)
#define SDMMC_CMD_DAT_EXP BIT(9)
#define SDMMC_CMD_RESP_CRC BIT(8)
#define SDMMC_CMD_RESP_LONG BIT(7)
#define SDMMC_CMD_RESP_EXP BIT(6)
#define SDMMC_CMD_INDX(n) ((n) & 0x1F)
/* Status register defines */
#define SDMMC_GET_FCNT(x) (((x)>>17) & 0x1FFF)
#define SDMMC_STATUS_DMA_REQ BIT(31)
#define SDMMC_STATUS_BUSY BIT(9)
/* FIFOTH register defines */
#define SDMMC_SET_FIFOTH(m, r, t) (((m) & 0x7) << 28 | \
((r) & 0xFFF) << 16 | \
((t) & 0xFFF))
/* HCON register defines */
#define DMA_INTERFACE_IDMA (0x0)
#define DMA_INTERFACE_DWDMA (0x1)
#define DMA_INTERFACE_GDMA (0x2)
#define DMA_INTERFACE_NODMA (0x3)
#define SDMMC_GET_TRANS_MODE(x) (((x)>>16) & 0x3)
#define SDMMC_GET_SLOT_NUM(x) ((((x)>>1) & 0x1F) + 1)
#define SDMMC_GET_HDATA_WIDTH(x) (((x)>>7) & 0x7)
#define SDMMC_GET_ADDR_CONFIG(x) (((x)>>27) & 0x1)
/* Internal DMAC interrupt defines */
#define SDMMC_IDMAC_INT_AI BIT(9)
#define SDMMC_IDMAC_INT_NI BIT(8)
#define SDMMC_IDMAC_INT_CES BIT(5)
#define SDMMC_IDMAC_INT_DU BIT(4)
#define SDMMC_IDMAC_INT_FBE BIT(2)
#define SDMMC_IDMAC_INT_RI BIT(1)
#define SDMMC_IDMAC_INT_TI BIT(0)
/* Internal DMAC bus mode bits */
#define SDMMC_IDMAC_ENABLE BIT(7)
#define SDMMC_IDMAC_FB BIT(1)
#define SDMMC_IDMAC_SWRESET BIT(0)
/* H/W reset */
#define SDMMC_RST_HWACTIVE 0x1
/* Version ID register define */
#define SDMMC_GET_VERID(x) ((x) & 0xFFFF)
/* Card read threshold */
#define SDMMC_SET_THLD(v, x) (((v) & 0xFFF) << 16 | (x))
#define SDMMC_CARD_WR_THR_EN BIT(2)
#define SDMMC_CARD_RD_THR_EN BIT(0)
/* UHS-1 register defines */
#define SDMMC_UHS_DDR BIT(16)
#define SDMMC_UHS_18V BIT(0)
/* DDR register defines */
#define SDMMC_DDR_HS400 BIT(31)
/* Enable shift register defines */
#define SDMMC_ENABLE_PHASE BIT(0)
/* All ctrl reset bits */
#define SDMMC_CTRL_ALL_RESET_FLAGS \
(SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET | SDMMC_CTRL_DMA_RESET)
/* FIFO register access macros. These should not change the data endian-ness
* as they are written to memory to be dealt with by the upper layers
*/
#define mci_fifo_readw(__reg) __raw_readw(__reg)
#define mci_fifo_readl(__reg) __raw_readl(__reg)
#define mci_fifo_readq(__reg) __raw_readq(__reg)
#define mci_fifo_writew(__value, __reg) __raw_writew(__reg, __value)
#define mci_fifo_writel(__value, __reg) __raw_writel(__reg, __value)
#define mci_fifo_writeq(__value, __reg) __raw_writeq(__reg, __value)
/* Register access macros */
#define mci_readl(dev, reg) \
readl_relaxed((dev)->regs + SDMMC_##reg)
#define mci_writel(dev, reg, value) \
writel_relaxed((value), (dev)->regs + SDMMC_##reg)
/* 16-bit FIFO access macros */
#define mci_readw(dev, reg) \
readw_relaxed((dev)->regs + SDMMC_##reg)
#define mci_writew(dev, reg, value) \
writew_relaxed((value), (dev)->regs + SDMMC_##reg)
/* 64-bit FIFO access macros */
#ifdef readq
#define mci_readq(dev, reg) \
readq_relaxed((dev)->regs + SDMMC_##reg)
#define mci_writeq(dev, reg, value) \
writeq_relaxed((value), (dev)->regs + SDMMC_##reg)
#else
/*
* Dummy readq implementation for architectures that don't define it.
*
* 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.
*/
#define mci_readq(dev, reg) \
(*(volatile u64 __force *)((dev)->regs + SDMMC_##reg))
#define mci_writeq(dev, reg, value) \
(*(volatile u64 __force *)((dev)->regs + SDMMC_##reg) = (value))
#define __raw_writeq(__value, __reg) \
(*(volatile u64 __force *)(__reg) = (__value))
#define __raw_readq(__reg) (*(volatile u64 __force *)(__reg))
#endif
extern int dw_mci_probe(struct dw_mci *host);
extern void dw_mci_remove(struct dw_mci *host);
#ifdef CONFIG_PM
extern int dw_mci_runtime_suspend(struct device *device);
extern int dw_mci_runtime_resume(struct device *device);
#endif
/**
* 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.
* @hw_reset: implementation specific HW reset.
*
* 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);
void (*hw_reset)(struct dw_mci *host);
};
#endif /* _DW_MMC_H_ */
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