211 lines
6.6 KiB
C
211 lines
6.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Freescale GPMI NAND Flash Driver
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*
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* Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
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* Copyright (C) 2008 Embedded Alley Solutions, Inc.
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*/
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#ifndef __DRIVERS_MTD_NAND_GPMI_NAND_H
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#define __DRIVERS_MTD_NAND_GPMI_NAND_H
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#include <linux/mtd/rawnand.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmaengine.h>
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#define GPMI_CLK_MAX 5 /* MX6Q needs five clocks */
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struct resources {
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void __iomem *gpmi_regs;
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void __iomem *bch_regs;
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unsigned int dma_low_channel;
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unsigned int dma_high_channel;
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struct clk *clock[GPMI_CLK_MAX];
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};
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/**
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* struct bch_geometry - BCH geometry description.
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* @gf_len: The length of Galois Field. (e.g., 13 or 14)
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* @ecc_strength: A number that describes the strength of the ECC
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* algorithm.
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* @page_size: The size, in bytes, of a physical page, including
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* both data and OOB.
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* @metadata_size: The size, in bytes, of the metadata.
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* @ecc_chunk_size: The size, in bytes, of a single ECC chunk. Note
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* the first chunk in the page includes both data and
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* metadata, so it's a bit larger than this value.
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* @ecc_chunk_count: The number of ECC chunks in the page,
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* @payload_size: The size, in bytes, of the payload buffer.
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* @auxiliary_size: The size, in bytes, of the auxiliary buffer.
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* @auxiliary_status_offset: The offset into the auxiliary buffer at which
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* the ECC status appears.
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* @block_mark_byte_offset: The byte offset in the ECC-based page view at
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* which the underlying physical block mark appears.
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* @block_mark_bit_offset: The bit offset into the ECC-based page view at
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* which the underlying physical block mark appears.
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*/
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struct bch_geometry {
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unsigned int gf_len;
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unsigned int ecc_strength;
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unsigned int page_size;
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unsigned int metadata_size;
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unsigned int ecc_chunk_size;
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unsigned int ecc_chunk_count;
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unsigned int payload_size;
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unsigned int auxiliary_size;
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unsigned int auxiliary_status_offset;
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unsigned int block_mark_byte_offset;
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unsigned int block_mark_bit_offset;
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};
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/**
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* struct boot_rom_geometry - Boot ROM geometry description.
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* @stride_size_in_pages: The size of a boot block stride, in pages.
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* @search_area_stride_exponent: The logarithm to base 2 of the size of a
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* search area in boot block strides.
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*/
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struct boot_rom_geometry {
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unsigned int stride_size_in_pages;
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unsigned int search_area_stride_exponent;
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};
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enum gpmi_type {
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IS_MX23,
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IS_MX28,
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IS_MX6Q,
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IS_MX6SX,
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IS_MX7D,
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};
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struct gpmi_devdata {
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enum gpmi_type type;
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int bch_max_ecc_strength;
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int max_chain_delay; /* See the async EDO mode */
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const char * const *clks;
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const int clks_count;
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};
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/**
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* struct gpmi_nfc_hardware_timing - GPMI hardware timing parameters.
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* @must_apply_timings: Whether controller timings have already been
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* applied or not (useful only while there is
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* support for only one chip select)
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* @clk_rate: The clock rate that must be used to derive the
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* following parameters
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* @timing0: HW_GPMI_TIMING0 register
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* @timing1: HW_GPMI_TIMING1 register
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* @ctrl1n: HW_GPMI_CTRL1n register
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*/
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struct gpmi_nfc_hardware_timing {
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bool must_apply_timings;
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unsigned long int clk_rate;
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u32 timing0;
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u32 timing1;
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u32 ctrl1n;
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};
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struct gpmi_nand_data {
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/* Devdata */
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const struct gpmi_devdata *devdata;
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/* System Interface */
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struct device *dev;
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struct platform_device *pdev;
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/* Resources */
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struct resources resources;
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/* Flash Hardware */
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struct gpmi_nfc_hardware_timing hw;
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/* BCH */
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struct bch_geometry bch_geometry;
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struct completion bch_done;
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/* NAND Boot issue */
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bool swap_block_mark;
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struct boot_rom_geometry rom_geometry;
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/* MTD / NAND */
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struct nand_chip nand;
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/* General-use Variables */
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int current_chip;
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unsigned int command_length;
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struct scatterlist cmd_sgl;
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char *cmd_buffer;
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struct scatterlist data_sgl;
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char *data_buffer_dma;
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void *page_buffer_virt;
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dma_addr_t page_buffer_phys;
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unsigned int page_buffer_size;
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void *payload_virt;
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dma_addr_t payload_phys;
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void *auxiliary_virt;
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dma_addr_t auxiliary_phys;
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void *raw_buffer;
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/* DMA channels */
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#define DMA_CHANS 8
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struct dma_chan *dma_chans[DMA_CHANS];
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struct completion dma_done;
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/* private */
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void *private;
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};
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/* Common Services */
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int common_nfc_set_geometry(struct gpmi_nand_data *);
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struct dma_chan *get_dma_chan(struct gpmi_nand_data *);
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bool prepare_data_dma(struct gpmi_nand_data *, const void *buf, int len,
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enum dma_data_direction dr);
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int start_dma_without_bch_irq(struct gpmi_nand_data *,
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struct dma_async_tx_descriptor *);
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int start_dma_with_bch_irq(struct gpmi_nand_data *,
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struct dma_async_tx_descriptor *);
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/* GPMI-NAND helper function library */
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int gpmi_init(struct gpmi_nand_data *);
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void gpmi_clear_bch(struct gpmi_nand_data *);
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void gpmi_dump_info(struct gpmi_nand_data *);
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int bch_set_geometry(struct gpmi_nand_data *);
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int gpmi_is_ready(struct gpmi_nand_data *, unsigned chip);
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int gpmi_send_command(struct gpmi_nand_data *);
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int gpmi_enable_clk(struct gpmi_nand_data *this);
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int gpmi_disable_clk(struct gpmi_nand_data *this);
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int gpmi_setup_data_interface(struct mtd_info *mtd, int chipnr,
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const struct nand_data_interface *conf);
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void gpmi_nfc_apply_timings(struct gpmi_nand_data *this);
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int gpmi_read_data(struct gpmi_nand_data *, void *buf, int len);
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int gpmi_send_data(struct gpmi_nand_data *, const void *buf, int len);
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int gpmi_send_page(struct gpmi_nand_data *,
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dma_addr_t payload, dma_addr_t auxiliary);
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int gpmi_read_page(struct gpmi_nand_data *,
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dma_addr_t payload, dma_addr_t auxiliary);
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void gpmi_copy_bits(u8 *dst, size_t dst_bit_off,
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const u8 *src, size_t src_bit_off,
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size_t nbits);
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/* BCH : Status Block Completion Codes */
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#define STATUS_GOOD 0x00
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#define STATUS_ERASED 0xff
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#define STATUS_UNCORRECTABLE 0xfe
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/* Use the devdata to distinguish different Archs. */
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#define GPMI_IS_MX23(x) ((x)->devdata->type == IS_MX23)
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#define GPMI_IS_MX28(x) ((x)->devdata->type == IS_MX28)
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#define GPMI_IS_MX6Q(x) ((x)->devdata->type == IS_MX6Q)
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#define GPMI_IS_MX6SX(x) ((x)->devdata->type == IS_MX6SX)
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#define GPMI_IS_MX7D(x) ((x)->devdata->type == IS_MX7D)
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#define GPMI_IS_MX6(x) (GPMI_IS_MX6Q(x) || GPMI_IS_MX6SX(x) || \
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GPMI_IS_MX7D(x))
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#endif
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