1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright © 2009 - Maxim Levitsky
4  * driver for Ricoh xD readers
5  */
6 
7 #include <linux/pci.h>
8 #include <linux/completion.h>
9 #include <linux/workqueue.h>
10 #include <linux/mtd/rawnand.h>
11 #include <linux/spinlock.h>
12 
13 
14 /* nand interface + ecc
15    byte write/read does one cycle on nand data lines.
16    dword write/read does 4 cycles
17    if R852_CTL_ECC_ACCESS is set in R852_CTL, then dword read reads
18    results of ecc correction, if DMA read was done before.
19    If write was done two dword reads read generated ecc checksums
20 */
21 #define	R852_DATALINE		0x00
22 
23 /* control register */
24 #define R852_CTL		0x04
25 #define R852_CTL_COMMAND 	0x01	/* send command (#CLE)*/
26 #define R852_CTL_DATA		0x02	/* read/write data (#ALE)*/
27 #define R852_CTL_ON		0x04	/* only seem to controls the hd led, */
28 					/* but has to be set on start...*/
29 #define R852_CTL_RESET		0x08	/* unknown, set only on start once*/
30 #define R852_CTL_CARDENABLE	0x10	/* probably (#CE) - always set*/
31 #define R852_CTL_ECC_ENABLE	0x20	/* enable ecc engine */
32 #define R852_CTL_ECC_ACCESS	0x40	/* read/write ecc via reg #0*/
33 #define R852_CTL_WRITE		0x80	/* set when performing writes (#WP) */
34 
35 /* card detection status */
36 #define R852_CARD_STA		0x05
37 
38 #define R852_CARD_STA_CD	0x01	/* state of #CD line, same as 0x04 */
39 #define R852_CARD_STA_RO	0x02	/* card is readonly */
40 #define R852_CARD_STA_PRESENT	0x04	/* card is present (#CD) */
41 #define R852_CARD_STA_ABSENT	0x08	/* card is absent */
42 #define R852_CARD_STA_BUSY	0x80	/* card is busy - (#R/B) */
43 
44 /* card detection irq status & enable*/
45 #define R852_CARD_IRQ_STA	0x06	/* IRQ status */
46 #define R852_CARD_IRQ_ENABLE	0x07	/* IRQ enable */
47 
48 #define R852_CARD_IRQ_CD	0x01	/* fire when #CD lights, same as 0x04*/
49 #define R852_CARD_IRQ_REMOVE	0x04	/* detect card removal */
50 #define R852_CARD_IRQ_INSERT	0x08	/* detect card insert */
51 #define R852_CARD_IRQ_UNK1	0x10	/* unknown */
52 #define R852_CARD_IRQ_GENABLE	0x80	/* general enable */
53 #define R852_CARD_IRQ_MASK	0x1D
54 
55 
56 
57 /* hardware enable */
58 #define R852_HW			0x08
59 #define R852_HW_ENABLED		0x01	/* hw enabled */
60 #define R852_HW_UNKNOWN		0x80
61 
62 
63 /* dma capabilities */
64 #define R852_DMA_CAP		0x09
65 #define R852_SMBIT		0x20	/* if set with bit #6 or bit #7, then */
66 					/* hw is smartmedia */
67 #define R852_DMA1		0x40	/* if set w/bit #7, dma is supported */
68 #define R852_DMA2		0x80	/* if set w/bit #6, dma is supported */
69 
70 
71 /* physical DMA address - 32 bit value*/
72 #define R852_DMA_ADDR		0x0C
73 
74 
75 /* dma settings */
76 #define R852_DMA_SETTINGS	0x10
77 #define R852_DMA_MEMORY		0x01	/* (memory <-> internal hw buffer) */
78 #define R852_DMA_READ		0x02	/* 0 = write, 1 = read */
79 #define R852_DMA_INTERNAL	0x04	/* (internal hw buffer <-> card) */
80 
81 /* dma IRQ status */
82 #define R852_DMA_IRQ_STA		0x14
83 
84 /* dma IRQ enable */
85 #define R852_DMA_IRQ_ENABLE	0x18
86 
87 #define R852_DMA_IRQ_MEMORY	0x01	/* (memory <-> internal hw buffer) */
88 #define R852_DMA_IRQ_ERROR	0x02	/* error did happen */
89 #define R852_DMA_IRQ_INTERNAL	0x04	/* (internal hw buffer <-> card) */
90 #define R852_DMA_IRQ_MASK	0x07	/* mask of all IRQ bits */
91 
92 
93 /* ECC syndrome format - read from reg #0 will return two copies of these for
94    each half of the page.
95    first byte is error byte location, and second, bit location + flags */
96 #define R852_ECC_ERR_BIT_MSK	0x07	/* error bit location */
97 #define R852_ECC_CORRECT		0x10	/* no errors - (guessed) */
98 #define R852_ECC_CORRECTABLE	0x20	/* correctable error exist */
99 #define R852_ECC_FAIL		0x40	/* non correctable error detected */
100 
101 #define R852_DMA_LEN		512
102 
103 #define DMA_INTERNAL	0
104 #define DMA_MEMORY	1
105 
106 struct r852_device {
107 	struct nand_controller		controller;
108 	void __iomem *mmio;		/* mmio */
109 	struct nand_chip *chip;		/* nand chip backpointer */
110 	struct pci_dev *pci_dev;	/* pci backpointer */
111 
112 	/* dma area */
113 	dma_addr_t phys_dma_addr;	/* bus address of buffer*/
114 	struct completion dma_done;	/* data transfer done */
115 
116 	dma_addr_t phys_bounce_buffer;	/* bus address of bounce buffer */
117 	uint8_t *bounce_buffer;		/* virtual address of bounce buffer */
118 
119 	int dma_dir;			/* 1 = read, 0 = write */
120 	int dma_stage;			/* 0 - idle, 1 - first step,
121 					   2 - second step */
122 
123 	int dma_state;			/* 0 = internal, 1 = memory */
124 	int dma_error;			/* dma errors */
125 	int dma_usable;			/* is it possible to use dma */
126 
127 	/* card status area */
128 	struct delayed_work card_detect_work;
129 	struct workqueue_struct *card_workqueue;
130 	int card_registered;		/* card registered with mtd */
131 	int card_detected;		/* card detected in slot */
132 	int card_unstable;		/* whenever the card is inserted,
133 					   is not known yet */
134 	int readonly;			/* card is readonly */
135 	int sm;				/* Is card smartmedia */
136 
137 	/* interrupt handling */
138 	spinlock_t irqlock;		/* IRQ protecting lock */
139 	int irq;			/* irq num */
140 	/* misc */
141 	void *tmp_buffer;		/* temporary buffer */
142 	uint8_t ctlreg;			/* cached contents of control reg */
143 };
144 
145 #define dbg(format, ...) \
146 	if (debug) \
147 		pr_debug(format "\n", ## __VA_ARGS__)
148 
149 #define dbg_verbose(format, ...) \
150 	if (debug > 1) \
151 		pr_debug(format "\n", ## __VA_ARGS__)
152 
153 
154 #define message(format, ...) \
155 	pr_info(format "\n", ## __VA_ARGS__)
156