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linux/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
Shawn Guo 5fac0e18bd mtd: gpmi: move to use generic DMA helper 
With the generic DMA device tree helper supported by mxs-dma driver,
client devices only need to call dma_request_slave_channel() for
requesting a DMA channel from dmaengine.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
2013-04-04 21:22:45 +08:00

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/*
* Freescale GPMI NAND Flash Driver
*
* Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
* Copyright (C) 2008 Embedded Alley Solutions, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __DRIVERS_MTD_NAND_GPMI_NAND_H
#define __DRIVERS_MTD_NAND_GPMI_NAND_H
#include <linux/mtd/nand.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#define GPMI_CLK_MAX 5 /* MX6Q needs five clocks */
struct resources {
void __iomem *gpmi_regs;
void __iomem *bch_regs;
unsigned int bch_low_interrupt;
unsigned int bch_high_interrupt;
unsigned int dma_low_channel;
unsigned int dma_high_channel;
struct clk *clock[GPMI_CLK_MAX];
};
/**
* struct bch_geometry - BCH geometry description.
* @gf_len: The length of Galois Field. (e.g., 13 or 14)
* @ecc_strength: A number that describes the strength of the ECC
* algorithm.
* @page_size: The size, in bytes, of a physical page, including
* both data and OOB.
* @metadata_size: The size, in bytes, of the metadata.
* @ecc_chunk_size: The size, in bytes, of a single ECC chunk. Note
* the first chunk in the page includes both data and
* metadata, so it's a bit larger than this value.
* @ecc_chunk_count: The number of ECC chunks in the page,
* @payload_size: The size, in bytes, of the payload buffer.
* @auxiliary_size: The size, in bytes, of the auxiliary buffer.
* @auxiliary_status_offset: The offset into the auxiliary buffer at which
* the ECC status appears.
* @block_mark_byte_offset: The byte offset in the ECC-based page view at
* which the underlying physical block mark appears.
* @block_mark_bit_offset: The bit offset into the ECC-based page view at
* which the underlying physical block mark appears.
*/
struct bch_geometry {
unsigned int gf_len;
unsigned int ecc_strength;
unsigned int page_size;
unsigned int metadata_size;
unsigned int ecc_chunk_size;
unsigned int ecc_chunk_count;
unsigned int payload_size;
unsigned int auxiliary_size;
unsigned int auxiliary_status_offset;
unsigned int block_mark_byte_offset;
unsigned int block_mark_bit_offset;
};
/**
* struct boot_rom_geometry - Boot ROM geometry description.
* @stride_size_in_pages: The size of a boot block stride, in pages.
* @search_area_stride_exponent: The logarithm to base 2 of the size of a
* search area in boot block strides.
*/
struct boot_rom_geometry {
unsigned int stride_size_in_pages;
unsigned int search_area_stride_exponent;
};
/* DMA operations types */
enum dma_ops_type {
DMA_FOR_COMMAND = 1,
DMA_FOR_READ_DATA,
DMA_FOR_WRITE_DATA,
DMA_FOR_READ_ECC_PAGE,
DMA_FOR_WRITE_ECC_PAGE
};
/**
* struct nand_timing - Fundamental timing attributes for NAND.
* @data_setup_in_ns: The data setup time, in nanoseconds. Usually the
* maximum of tDS and tWP. A negative value
* indicates this characteristic isn't known.
* @data_hold_in_ns: The data hold time, in nanoseconds. Usually the
* maximum of tDH, tWH and tREH. A negative value
* indicates this characteristic isn't known.
* @address_setup_in_ns: The address setup time, in nanoseconds. Usually
* the maximum of tCLS, tCS and tALS. A negative
* value indicates this characteristic isn't known.
* @gpmi_sample_delay_in_ns: A GPMI-specific timing parameter. A negative value
* indicates this characteristic isn't known.
* @tREA_in_ns: tREA, in nanoseconds, from the data sheet. A
* negative value indicates this characteristic isn't
* known.
* @tRLOH_in_ns: tRLOH, in nanoseconds, from the data sheet. A
* negative value indicates this characteristic isn't
* known.
* @tRHOH_in_ns: tRHOH, in nanoseconds, from the data sheet. A
* negative value indicates this characteristic isn't
* known.
*/
struct nand_timing {
int8_t data_setup_in_ns;
int8_t data_hold_in_ns;
int8_t address_setup_in_ns;
int8_t gpmi_sample_delay_in_ns;
int8_t tREA_in_ns;
int8_t tRLOH_in_ns;
int8_t tRHOH_in_ns;
};
struct gpmi_nand_data {
/* flags */
#define GPMI_ASYNC_EDO_ENABLED (1 << 0)
#define GPMI_TIMING_INIT_OK (1 << 1)
int flags;
/* System Interface */
struct device *dev;
struct platform_device *pdev;
/* Resources */
struct resources resources;
/* Flash Hardware */
struct nand_timing timing;
int timing_mode;
/* BCH */
struct bch_geometry bch_geometry;
struct completion bch_done;
/* NAND Boot issue */
bool swap_block_mark;
struct boot_rom_geometry rom_geometry;
/* MTD / NAND */
struct nand_chip nand;
struct mtd_info mtd;
/* General-use Variables */
int current_chip;
unsigned int command_length;
/* passed from upper layer */
uint8_t *upper_buf;
int upper_len;
/* for DMA operations */
bool direct_dma_map_ok;
struct scatterlist cmd_sgl;
char *cmd_buffer;
struct scatterlist data_sgl;
char *data_buffer_dma;
void *page_buffer_virt;
dma_addr_t page_buffer_phys;
unsigned int page_buffer_size;
void *payload_virt;
dma_addr_t payload_phys;
void *auxiliary_virt;
dma_addr_t auxiliary_phys;
/* DMA channels */
#define DMA_CHANS 8
struct dma_chan *dma_chans[DMA_CHANS];
enum dma_ops_type last_dma_type;
enum dma_ops_type dma_type;
struct completion dma_done;
/* private */
void *private;
};
/**
* struct gpmi_nfc_hardware_timing - GPMI hardware timing parameters.
* @data_setup_in_cycles: The data setup time, in cycles.
* @data_hold_in_cycles: The data hold time, in cycles.
* @address_setup_in_cycles: The address setup time, in cycles.
* @device_busy_timeout: The timeout waiting for NAND Ready/Busy,
* this value is the number of cycles multiplied
* by 4096.
* @use_half_periods: Indicates the clock is running slowly, so the
* NFC DLL should use half-periods.
* @sample_delay_factor: The sample delay factor.
* @wrn_dly_sel: The delay on the GPMI write strobe.
*/
struct gpmi_nfc_hardware_timing {
/* for HW_GPMI_TIMING0 */
uint8_t data_setup_in_cycles;
uint8_t data_hold_in_cycles;
uint8_t address_setup_in_cycles;
/* for HW_GPMI_TIMING1 */
uint16_t device_busy_timeout;
#define GPMI_DEFAULT_BUSY_TIMEOUT 0x500 /* default busy timeout value.*/
/* for HW_GPMI_CTRL1 */
bool use_half_periods;
uint8_t sample_delay_factor;
uint8_t wrn_dly_sel;
};
/**
* struct timing_threshod - Timing threshold
* @max_data_setup_cycles: The maximum number of data setup cycles that
* can be expressed in the hardware.
* @internal_data_setup_in_ns: The time, in ns, that the NFC hardware requires
* for data read internal setup. In the Reference
* Manual, see the chapter "High-Speed NAND
* Timing" for more details.
* @max_sample_delay_factor: The maximum sample delay factor that can be
* expressed in the hardware.
* @max_dll_clock_period_in_ns: The maximum period of the GPMI clock that the
* sample delay DLL hardware can possibly work
* with (the DLL is unusable with longer periods).
* If the full-cycle period is greater than HALF
* this value, the DLL must be configured to use
* half-periods.
* @max_dll_delay_in_ns: The maximum amount of delay, in ns, that the
* DLL can implement.
* @clock_frequency_in_hz: The clock frequency, in Hz, during the current
* I/O transaction. If no I/O transaction is in
* progress, this is the clock frequency during
* the most recent I/O transaction.
*/
struct timing_threshod {
const unsigned int max_chip_count;
const unsigned int max_data_setup_cycles;
const unsigned int internal_data_setup_in_ns;
const unsigned int max_sample_delay_factor;
const unsigned int max_dll_clock_period_in_ns;
const unsigned int max_dll_delay_in_ns;
unsigned long clock_frequency_in_hz;
};
/* Common Services */
extern int common_nfc_set_geometry(struct gpmi_nand_data *);
extern struct dma_chan *get_dma_chan(struct gpmi_nand_data *);
extern void prepare_data_dma(struct gpmi_nand_data *,
enum dma_data_direction dr);
extern int start_dma_without_bch_irq(struct gpmi_nand_data *,
struct dma_async_tx_descriptor *);
extern int start_dma_with_bch_irq(struct gpmi_nand_data *,
struct dma_async_tx_descriptor *);
/* GPMI-NAND helper function library */
extern int gpmi_init(struct gpmi_nand_data *);
extern int gpmi_extra_init(struct gpmi_nand_data *);
extern void gpmi_clear_bch(struct gpmi_nand_data *);
extern void gpmi_dump_info(struct gpmi_nand_data *);
extern int bch_set_geometry(struct gpmi_nand_data *);
extern int gpmi_is_ready(struct gpmi_nand_data *, unsigned chip);
extern int gpmi_send_command(struct gpmi_nand_data *);
extern void gpmi_begin(struct gpmi_nand_data *);
extern void gpmi_end(struct gpmi_nand_data *);
extern int gpmi_read_data(struct gpmi_nand_data *);
extern int gpmi_send_data(struct gpmi_nand_data *);
extern int gpmi_send_page(struct gpmi_nand_data *,
dma_addr_t payload, dma_addr_t auxiliary);
extern int gpmi_read_page(struct gpmi_nand_data *,
dma_addr_t payload, dma_addr_t auxiliary);
/* BCH : Status Block Completion Codes */
#define STATUS_GOOD 0x00
#define STATUS_ERASED 0xff
#define STATUS_UNCORRECTABLE 0xfe
/* BCH's bit correction capability. */
#define MXS_ECC_STRENGTH_MAX 20 /* mx23 and mx28 */
#define MX6_ECC_STRENGTH_MAX 40
/* Use the platform_id to distinguish different Archs. */
#define IS_MX23 0x0
#define IS_MX28 0x1
#define IS_MX6Q 0x2
#define GPMI_IS_MX23(x) ((x)->pdev->id_entry->driver_data == IS_MX23)
#define GPMI_IS_MX28(x) ((x)->pdev->id_entry->driver_data == IS_MX28)
#define GPMI_IS_MX6Q(x) ((x)->pdev->id_entry->driver_data == IS_MX6Q)
#endif
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