This source file includes following definitions.
- at91_init_twi_bus_slave
- at91_twi_probe_slave
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16 #include <linux/clk.h>
17 #include <linux/completion.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/dmaengine.h>
20 #include <linux/i2c.h>
21 #include <linux/platform_data/dma-atmel.h>
22 #include <linux/platform_device.h>
23
24 #define AT91_I2C_TIMEOUT msecs_to_jiffies(100)
25 #define AT91_I2C_DMA_THRESHOLD 8
26 #define AUTOSUSPEND_TIMEOUT 2000
27 #define AT91_I2C_MAX_ALT_CMD_DATA_SIZE 256
28
29
30 #define AT91_TWI_CR 0x0000
31 #define AT91_TWI_START BIT(0)
32 #define AT91_TWI_STOP BIT(1)
33 #define AT91_TWI_MSEN BIT(2)
34 #define AT91_TWI_MSDIS BIT(3)
35 #define AT91_TWI_SVEN BIT(4)
36 #define AT91_TWI_SVDIS BIT(5)
37 #define AT91_TWI_QUICK BIT(6)
38 #define AT91_TWI_SWRST BIT(7)
39 #define AT91_TWI_ACMEN BIT(16)
40 #define AT91_TWI_ACMDIS BIT(17)
41 #define AT91_TWI_THRCLR BIT(24)
42 #define AT91_TWI_RHRCLR BIT(25)
43 #define AT91_TWI_LOCKCLR BIT(26)
44 #define AT91_TWI_FIFOEN BIT(28)
45 #define AT91_TWI_FIFODIS BIT(29)
46
47 #define AT91_TWI_MMR 0x0004
48 #define AT91_TWI_IADRSZ_1 0x0100
49 #define AT91_TWI_MREAD BIT(12)
50
51 #define AT91_TWI_SMR 0x0008
52 #define AT91_TWI_SMR_SADR_MAX 0x007f
53 #define AT91_TWI_SMR_SADR(x) (((x) & AT91_TWI_SMR_SADR_MAX) << 16)
54
55 #define AT91_TWI_IADR 0x000c
56
57 #define AT91_TWI_CWGR 0x0010
58 #define AT91_TWI_CWGR_HOLD_MAX 0x1f
59 #define AT91_TWI_CWGR_HOLD(x) (((x) & AT91_TWI_CWGR_HOLD_MAX) << 24)
60
61 #define AT91_TWI_SR 0x0020
62 #define AT91_TWI_TXCOMP BIT(0)
63 #define AT91_TWI_RXRDY BIT(1)
64 #define AT91_TWI_TXRDY BIT(2)
65 #define AT91_TWI_SVREAD BIT(3)
66 #define AT91_TWI_SVACC BIT(4)
67 #define AT91_TWI_OVRE BIT(6)
68 #define AT91_TWI_UNRE BIT(7)
69 #define AT91_TWI_NACK BIT(8)
70 #define AT91_TWI_EOSACC BIT(11)
71 #define AT91_TWI_LOCK BIT(23)
72
73 #define AT91_TWI_INT_MASK \
74 (AT91_TWI_TXCOMP | AT91_TWI_RXRDY | AT91_TWI_TXRDY | AT91_TWI_NACK \
75 | AT91_TWI_SVACC | AT91_TWI_EOSACC)
76
77 #define AT91_TWI_IER 0x0024
78 #define AT91_TWI_IDR 0x0028
79 #define AT91_TWI_IMR 0x002c
80 #define AT91_TWI_RHR 0x0030
81 #define AT91_TWI_THR 0x0034
82
83 #define AT91_TWI_ACR 0x0040
84 #define AT91_TWI_ACR_DATAL(len) ((len) & 0xff)
85 #define AT91_TWI_ACR_DIR BIT(8)
86
87 #define AT91_TWI_FMR 0x0050
88 #define AT91_TWI_FMR_TXRDYM(mode) (((mode) & 0x3) << 0)
89 #define AT91_TWI_FMR_TXRDYM_MASK (0x3 << 0)
90 #define AT91_TWI_FMR_RXRDYM(mode) (((mode) & 0x3) << 4)
91 #define AT91_TWI_FMR_RXRDYM_MASK (0x3 << 4)
92 #define AT91_TWI_ONE_DATA 0x0
93 #define AT91_TWI_TWO_DATA 0x1
94 #define AT91_TWI_FOUR_DATA 0x2
95
96 #define AT91_TWI_FLR 0x0054
97
98 #define AT91_TWI_FSR 0x0060
99 #define AT91_TWI_FIER 0x0064
100 #define AT91_TWI_FIDR 0x0068
101 #define AT91_TWI_FIMR 0x006c
102
103 #define AT91_TWI_VER 0x00fc
104
105 struct at91_twi_pdata {
106 unsigned clk_max_div;
107 unsigned clk_offset;
108 bool has_unre_flag;
109 bool has_alt_cmd;
110 bool has_hold_field;
111 struct at_dma_slave dma_slave;
112 };
113
114 struct at91_twi_dma {
115 struct dma_chan *chan_rx;
116 struct dma_chan *chan_tx;
117 struct scatterlist sg[2];
118 struct dma_async_tx_descriptor *data_desc;
119 enum dma_data_direction direction;
120 bool buf_mapped;
121 bool xfer_in_progress;
122 };
123
124 struct at91_twi_dev {
125 struct device *dev;
126 void __iomem *base;
127 struct completion cmd_complete;
128 struct clk *clk;
129 u8 *buf;
130 size_t buf_len;
131 struct i2c_msg *msg;
132 int irq;
133 unsigned imr;
134 unsigned transfer_status;
135 struct i2c_adapter adapter;
136 unsigned twi_cwgr_reg;
137 struct at91_twi_pdata *pdata;
138 bool use_dma;
139 bool use_alt_cmd;
140 bool recv_len_abort;
141 u32 fifo_size;
142 struct at91_twi_dma dma;
143 bool slave_detected;
144 #ifdef CONFIG_I2C_AT91_SLAVE_EXPERIMENTAL
145 unsigned smr;
146 struct i2c_client *slave;
147 #endif
148 };
149
150 unsigned at91_twi_read(struct at91_twi_dev *dev, unsigned reg);
151 void at91_twi_write(struct at91_twi_dev *dev, unsigned reg, unsigned val);
152 void at91_disable_twi_interrupts(struct at91_twi_dev *dev);
153 void at91_twi_irq_save(struct at91_twi_dev *dev);
154 void at91_twi_irq_restore(struct at91_twi_dev *dev);
155 void at91_init_twi_bus(struct at91_twi_dev *dev);
156
157 void at91_init_twi_bus_master(struct at91_twi_dev *dev);
158 int at91_twi_probe_master(struct platform_device *pdev, u32 phy_addr,
159 struct at91_twi_dev *dev);
160
161 #ifdef CONFIG_I2C_AT91_SLAVE_EXPERIMENTAL
162 void at91_init_twi_bus_slave(struct at91_twi_dev *dev);
163 int at91_twi_probe_slave(struct platform_device *pdev, u32 phy_addr,
164 struct at91_twi_dev *dev);
165
166 #else
167 static inline void at91_init_twi_bus_slave(struct at91_twi_dev *dev) {}
168 static inline int at91_twi_probe_slave(struct platform_device *pdev,
169 u32 phy_addr, struct at91_twi_dev *dev)
170 {
171 return -EINVAL;
172 }
173
174 #endif