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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright © 2009 - Maxim Levitsky
* driver for Ricoh xD readers
*/
#include <linux/pci.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/mtd/rawnand.h>
#include <linux/spinlock.h>
/* nand interface + ecc
byte write/read does one cycle on nand data lines.
dword write/read does 4 cycles
if R852_CTL_ECC_ACCESS is set in R852_CTL, then dword read reads
results of ecc correction, if DMA read was done before.
If write was done two dword reads read generated ecc checksums
*/
#define R852_DATALINE 0x00
/* control register */
#define R852_CTL 0x04
#define R852_CTL_COMMAND 0x01 /* send command (#CLE)*/
#define R852_CTL_DATA 0x02 /* read/write data (#ALE)*/
#define R852_CTL_ON 0x04 /* only seem to controls the hd led, */
/* but has to be set on start...*/
#define R852_CTL_RESET 0x08 /* unknown, set only on start once*/
#define R852_CTL_CARDENABLE 0x10 /* probably (#CE) - always set*/
#define R852_CTL_ECC_ENABLE 0x20 /* enable ecc engine */
#define R852_CTL_ECC_ACCESS 0x40 /* read/write ecc via reg #0*/
#define R852_CTL_WRITE 0x80 /* set when performing writes (#WP) */
/* card detection status */
#define R852_CARD_STA 0x05
#define R852_CARD_STA_CD 0x01 /* state of #CD line, same as 0x04 */
#define R852_CARD_STA_RO 0x02 /* card is readonly */
#define R852_CARD_STA_PRESENT 0x04 /* card is present (#CD) */
#define R852_CARD_STA_ABSENT 0x08 /* card is absent */
#define R852_CARD_STA_BUSY 0x80 /* card is busy - (#R/B) */
/* card detection irq status & enable*/
#define R852_CARD_IRQ_STA 0x06 /* IRQ status */
#define R852_CARD_IRQ_ENABLE 0x07 /* IRQ enable */
#define R852_CARD_IRQ_CD 0x01 /* fire when #CD lights, same as 0x04*/
#define R852_CARD_IRQ_REMOVE 0x04 /* detect card removal */
#define R852_CARD_IRQ_INSERT 0x08 /* detect card insert */
#define R852_CARD_IRQ_UNK1 0x10 /* unknown */
#define R852_CARD_IRQ_GENABLE 0x80 /* general enable */
#define R852_CARD_IRQ_MASK 0x1D
/* hardware enable */
#define R852_HW 0x08
#define R852_HW_ENABLED 0x01 /* hw enabled */
#define R852_HW_UNKNOWN 0x80
/* dma capabilities */
#define R852_DMA_CAP 0x09
#define R852_SMBIT 0x20 /* if set with bit #6 or bit #7, then */
/* hw is smartmedia */
#define R852_DMA1 0x40 /* if set w/bit #7, dma is supported */
#define R852_DMA2 0x80 /* if set w/bit #6, dma is supported */
/* physical DMA address - 32 bit value*/
#define R852_DMA_ADDR 0x0C
/* dma settings */
#define R852_DMA_SETTINGS 0x10
#define R852_DMA_MEMORY 0x01 /* (memory <-> internal hw buffer) */
#define R852_DMA_READ 0x02 /* 0 = write, 1 = read */
#define R852_DMA_INTERNAL 0x04 /* (internal hw buffer <-> card) */
/* dma IRQ status */
#define R852_DMA_IRQ_STA 0x14
/* dma IRQ enable */
#define R852_DMA_IRQ_ENABLE 0x18
#define R852_DMA_IRQ_MEMORY 0x01 /* (memory <-> internal hw buffer) */
#define R852_DMA_IRQ_ERROR 0x02 /* error did happen */
#define R852_DMA_IRQ_INTERNAL 0x04 /* (internal hw buffer <-> card) */
#define R852_DMA_IRQ_MASK 0x07 /* mask of all IRQ bits */
/* ECC syndrome format - read from reg #0 will return two copies of these for
each half of the page.
first byte is error byte location, and second, bit location + flags */
#define R852_ECC_ERR_BIT_MSK 0x07 /* error bit location */
#define R852_ECC_CORRECT 0x10 /* no errors - (guessed) */
#define R852_ECC_CORRECTABLE 0x20 /* correctable error exist */
#define R852_ECC_FAIL 0x40 /* non correctable error detected */
#define R852_DMA_LEN 512
#define DMA_INTERNAL 0
#define DMA_MEMORY 1
struct r852_device {
void __iomem *mmio; /* mmio */
struct nand_chip *chip; /* nand chip backpointer */
struct pci_dev *pci_dev; /* pci backpointer */
/* dma area */
dma_addr_t phys_dma_addr; /* bus address of buffer*/
struct completion dma_done; /* data transfer done */
dma_addr_t phys_bounce_buffer; /* bus address of bounce buffer */
uint8_t *bounce_buffer; /* virtual address of bounce buffer */
int dma_dir; /* 1 = read, 0 = write */
int dma_stage; /* 0 - idle, 1 - first step,
2 - second step */
int dma_state; /* 0 = internal, 1 = memory */
int dma_error; /* dma errors */
int dma_usable; /* is it possible to use dma */
/* card status area */
struct delayed_work card_detect_work;
struct workqueue_struct *card_workqueue;
int card_registered; /* card registered with mtd */
int card_detected; /* card detected in slot */
int card_unstable; /* whenever the card is inserted,
is not known yet */
int readonly; /* card is readonly */
int sm; /* Is card smartmedia */
/* interrupt handling */
spinlock_t irqlock; /* IRQ protecting lock */
int irq; /* irq num */
/* misc */
void *tmp_buffer; /* temporary buffer */
uint8_t ctlreg; /* cached contents of control reg */
};
#define dbg(format, ...) \
if (debug) \
pr_debug(format "\n", ## __VA_ARGS__)
#define dbg_verbose(format, ...) \
if (debug > 1) \
pr_debug(format "\n", ## __VA_ARGS__)
#define message(format, ...) \
pr_info(format "\n", ## __VA_ARGS__)
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