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b43d65f7 LW |
1 | /* |
2 | * include/linux/amba/pl022.h | |
3 | * | |
4 | * Copyright (C) 2008-2009 ST-Ericsson AB | |
5 | * Copyright (C) 2006 STMicroelectronics Pvt. Ltd. | |
6 | * | |
7 | * Author: Linus Walleij <linus.walleij@stericsson.com> | |
8 | * | |
9 | * Initial version inspired by: | |
10 | * linux-2.6.17-rc3-mm1/drivers/spi/pxa2xx_spi.c | |
11 | * Initial adoption to PL022 by: | |
12 | * Sachin Verma <sachin.verma@st.com> | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | */ | |
24 | ||
25 | #ifndef _SSP_PL022_H | |
26 | #define _SSP_PL022_H | |
27 | ||
28 | #include <linux/device.h> | |
29 | ||
30 | /** | |
31 | * whether SSP is in loopback mode or not | |
32 | */ | |
33 | enum ssp_loopback { | |
34 | LOOPBACK_DISABLED, | |
35 | LOOPBACK_ENABLED | |
36 | }; | |
37 | ||
38 | /** | |
39 | * enum ssp_interface - interfaces allowed for this SSP Controller | |
40 | * @SSP_INTERFACE_MOTOROLA_SPI: Motorola Interface | |
41 | * @SSP_INTERFACE_TI_SYNC_SERIAL: Texas Instrument Synchronous Serial | |
42 | * interface | |
43 | * @SSP_INTERFACE_NATIONAL_MICROWIRE: National Semiconductor Microwire | |
44 | * interface | |
45 | * @SSP_INTERFACE_UNIDIRECTIONAL: Unidirectional interface (STn8810 | |
46 | * &STn8815 only) | |
47 | */ | |
48 | enum ssp_interface { | |
49 | SSP_INTERFACE_MOTOROLA_SPI, | |
50 | SSP_INTERFACE_TI_SYNC_SERIAL, | |
51 | SSP_INTERFACE_NATIONAL_MICROWIRE, | |
52 | SSP_INTERFACE_UNIDIRECTIONAL | |
53 | }; | |
54 | ||
55 | /** | |
56 | * enum ssp_hierarchy - whether SSP is configured as Master or Slave | |
57 | */ | |
58 | enum ssp_hierarchy { | |
59 | SSP_MASTER, | |
60 | SSP_SLAVE | |
61 | }; | |
62 | ||
63 | /** | |
64 | * enum ssp_clock_params - clock parameters, to set SSP clock at a | |
65 | * desired freq | |
66 | */ | |
67 | struct ssp_clock_params { | |
68 | u8 cpsdvsr; /* value from 2 to 254 (even only!) */ | |
69 | u8 scr; /* value from 0 to 255 */ | |
70 | }; | |
71 | ||
72 | /** | |
73 | * enum ssp_rx_endian - endianess of Rx FIFO Data | |
556f4aeb | 74 | * this feature is only available in ST versionf of PL022 |
b43d65f7 LW |
75 | */ |
76 | enum ssp_rx_endian { | |
77 | SSP_RX_MSB, | |
78 | SSP_RX_LSB | |
79 | }; | |
80 | ||
81 | /** | |
82 | * enum ssp_tx_endian - endianess of Tx FIFO Data | |
83 | */ | |
84 | enum ssp_tx_endian { | |
85 | SSP_TX_MSB, | |
86 | SSP_TX_LSB | |
87 | }; | |
88 | ||
89 | /** | |
90 | * enum ssp_data_size - number of bits in one data element | |
91 | */ | |
92 | enum ssp_data_size { | |
93 | SSP_DATA_BITS_4 = 0x03, SSP_DATA_BITS_5, SSP_DATA_BITS_6, | |
94 | SSP_DATA_BITS_7, SSP_DATA_BITS_8, SSP_DATA_BITS_9, | |
95 | SSP_DATA_BITS_10, SSP_DATA_BITS_11, SSP_DATA_BITS_12, | |
96 | SSP_DATA_BITS_13, SSP_DATA_BITS_14, SSP_DATA_BITS_15, | |
97 | SSP_DATA_BITS_16, SSP_DATA_BITS_17, SSP_DATA_BITS_18, | |
98 | SSP_DATA_BITS_19, SSP_DATA_BITS_20, SSP_DATA_BITS_21, | |
99 | SSP_DATA_BITS_22, SSP_DATA_BITS_23, SSP_DATA_BITS_24, | |
100 | SSP_DATA_BITS_25, SSP_DATA_BITS_26, SSP_DATA_BITS_27, | |
101 | SSP_DATA_BITS_28, SSP_DATA_BITS_29, SSP_DATA_BITS_30, | |
102 | SSP_DATA_BITS_31, SSP_DATA_BITS_32 | |
103 | }; | |
104 | ||
105 | /** | |
106 | * enum ssp_mode - SSP mode of operation (Communication modes) | |
107 | */ | |
108 | enum ssp_mode { | |
109 | INTERRUPT_TRANSFER, | |
110 | POLLING_TRANSFER, | |
111 | DMA_TRANSFER | |
112 | }; | |
113 | ||
114 | /** | |
115 | * enum ssp_rx_level_trig - receive FIFO watermark level which triggers | |
116 | * IT: Interrupt fires when _N_ or more elements in RX FIFO. | |
117 | */ | |
118 | enum ssp_rx_level_trig { | |
119 | SSP_RX_1_OR_MORE_ELEM, | |
120 | SSP_RX_4_OR_MORE_ELEM, | |
121 | SSP_RX_8_OR_MORE_ELEM, | |
122 | SSP_RX_16_OR_MORE_ELEM, | |
123 | SSP_RX_32_OR_MORE_ELEM | |
124 | }; | |
125 | ||
126 | /** | |
127 | * Transmit FIFO watermark level which triggers (IT Interrupt fires | |
128 | * when _N_ or more empty locations in TX FIFO) | |
129 | */ | |
130 | enum ssp_tx_level_trig { | |
131 | SSP_TX_1_OR_MORE_EMPTY_LOC, | |
132 | SSP_TX_4_OR_MORE_EMPTY_LOC, | |
133 | SSP_TX_8_OR_MORE_EMPTY_LOC, | |
134 | SSP_TX_16_OR_MORE_EMPTY_LOC, | |
135 | SSP_TX_32_OR_MORE_EMPTY_LOC | |
136 | }; | |
137 | ||
138 | /** | |
139 | * enum SPI Clock Phase - clock phase (Motorola SPI interface only) | |
ee2b805c LW |
140 | * @SSP_CLK_FIRST_EDGE: Receive data on first edge transition (actual direction depends on polarity) |
141 | * @SSP_CLK_SECOND_EDGE: Receive data on second edge transition (actual direction depends on polarity) | |
b43d65f7 LW |
142 | */ |
143 | enum ssp_spi_clk_phase { | |
ee2b805c LW |
144 | SSP_CLK_FIRST_EDGE, |
145 | SSP_CLK_SECOND_EDGE | |
b43d65f7 LW |
146 | }; |
147 | ||
148 | /** | |
149 | * enum SPI Clock Polarity - clock polarity (Motorola SPI interface only) | |
150 | * @SSP_CLK_POL_IDLE_LOW: Low inactive level | |
151 | * @SSP_CLK_POL_IDLE_HIGH: High inactive level | |
152 | */ | |
153 | enum ssp_spi_clk_pol { | |
154 | SSP_CLK_POL_IDLE_LOW, | |
155 | SSP_CLK_POL_IDLE_HIGH | |
156 | }; | |
157 | ||
158 | /** | |
159 | * Microwire Conrol Lengths Command size in microwire format | |
160 | */ | |
161 | enum ssp_microwire_ctrl_len { | |
162 | SSP_BITS_4 = 0x03, SSP_BITS_5, SSP_BITS_6, | |
163 | SSP_BITS_7, SSP_BITS_8, SSP_BITS_9, | |
164 | SSP_BITS_10, SSP_BITS_11, SSP_BITS_12, | |
165 | SSP_BITS_13, SSP_BITS_14, SSP_BITS_15, | |
166 | SSP_BITS_16, SSP_BITS_17, SSP_BITS_18, | |
167 | SSP_BITS_19, SSP_BITS_20, SSP_BITS_21, | |
168 | SSP_BITS_22, SSP_BITS_23, SSP_BITS_24, | |
169 | SSP_BITS_25, SSP_BITS_26, SSP_BITS_27, | |
170 | SSP_BITS_28, SSP_BITS_29, SSP_BITS_30, | |
171 | SSP_BITS_31, SSP_BITS_32 | |
172 | }; | |
173 | ||
174 | /** | |
175 | * enum Microwire Wait State | |
176 | * @SSP_MWIRE_WAIT_ZERO: No wait state inserted after last command bit | |
177 | * @SSP_MWIRE_WAIT_ONE: One wait state inserted after last command bit | |
178 | */ | |
179 | enum ssp_microwire_wait_state { | |
180 | SSP_MWIRE_WAIT_ZERO, | |
181 | SSP_MWIRE_WAIT_ONE | |
182 | }; | |
183 | ||
184 | /** | |
781c7b12 LW |
185 | * enum ssp_duplex - whether Full/Half Duplex on microwire, only |
186 | * available in the ST Micro variant. | |
b43d65f7 LW |
187 | * @SSP_MICROWIRE_CHANNEL_FULL_DUPLEX: SSPTXD becomes bi-directional, |
188 | * SSPRXD not used | |
189 | * @SSP_MICROWIRE_CHANNEL_HALF_DUPLEX: SSPTXD is an output, SSPRXD is | |
190 | * an input. | |
191 | */ | |
192 | enum ssp_duplex { | |
193 | SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, | |
194 | SSP_MICROWIRE_CHANNEL_HALF_DUPLEX | |
195 | }; | |
196 | ||
781c7b12 LW |
197 | /** |
198 | * enum ssp_clkdelay - an optional clock delay on the feedback clock | |
199 | * only available in the ST Micro PL023 variant. | |
200 | * @SSP_FEEDBACK_CLK_DELAY_NONE: no delay, the data coming in from the | |
201 | * slave is sampled directly | |
202 | * @SSP_FEEDBACK_CLK_DELAY_1T: the incoming slave data is sampled with | |
203 | * a delay of T-dt | |
204 | * @SSP_FEEDBACK_CLK_DELAY_2T: dito with a delay if 2T-dt | |
205 | * @SSP_FEEDBACK_CLK_DELAY_3T: dito with a delay if 3T-dt | |
206 | * @SSP_FEEDBACK_CLK_DELAY_4T: dito with a delay if 4T-dt | |
207 | * @SSP_FEEDBACK_CLK_DELAY_5T: dito with a delay if 5T-dt | |
208 | * @SSP_FEEDBACK_CLK_DELAY_6T: dito with a delay if 6T-dt | |
209 | * @SSP_FEEDBACK_CLK_DELAY_7T: dito with a delay if 7T-dt | |
210 | */ | |
211 | enum ssp_clkdelay { | |
212 | SSP_FEEDBACK_CLK_DELAY_NONE, | |
213 | SSP_FEEDBACK_CLK_DELAY_1T, | |
214 | SSP_FEEDBACK_CLK_DELAY_2T, | |
215 | SSP_FEEDBACK_CLK_DELAY_3T, | |
216 | SSP_FEEDBACK_CLK_DELAY_4T, | |
217 | SSP_FEEDBACK_CLK_DELAY_5T, | |
218 | SSP_FEEDBACK_CLK_DELAY_6T, | |
219 | SSP_FEEDBACK_CLK_DELAY_7T | |
220 | }; | |
221 | ||
b43d65f7 LW |
222 | /** |
223 | * CHIP select/deselect commands | |
224 | */ | |
225 | enum ssp_chip_select { | |
226 | SSP_CHIP_SELECT, | |
227 | SSP_CHIP_DESELECT | |
228 | }; | |
229 | ||
230 | ||
b1b6b9aa | 231 | struct dma_chan; |
b43d65f7 LW |
232 | /** |
233 | * struct pl022_ssp_master - device.platform_data for SPI controller devices. | |
234 | * @num_chipselect: chipselects are used to distinguish individual | |
235 | * SPI slaves, and are numbered from zero to num_chipselects - 1. | |
236 | * each slave has a chipselect signal, but it's common that not | |
237 | * every chipselect is connected to a slave. | |
238 | * @enable_dma: if true enables DMA driven transfers. | |
b1b6b9aa LW |
239 | * @dma_rx_param: parameter to locate an RX DMA channel. |
240 | * @dma_tx_param: parameter to locate a TX DMA channel. | |
b43d65f7 LW |
241 | */ |
242 | struct pl022_ssp_controller { | |
243 | u16 bus_id; | |
244 | u8 num_chipselect; | |
245 | u8 enable_dma:1; | |
b1b6b9aa LW |
246 | bool (*dma_filter)(struct dma_chan *chan, void *filter_param); |
247 | void *dma_rx_param; | |
248 | void *dma_tx_param; | |
b43d65f7 LW |
249 | }; |
250 | ||
251 | /** | |
252 | * struct ssp_config_chip - spi_board_info.controller_data for SPI | |
253 | * slave devices, copied to spi_device.controller_data. | |
254 | * | |
255 | * @lbm: used for test purpose to internally connect RX and TX | |
256 | * @iface: Interface type(Motorola, TI, Microwire, Universal) | |
257 | * @hierarchy: sets whether interface is master or slave | |
258 | * @slave_tx_disable: SSPTXD is disconnected (in slave mode only) | |
259 | * @clk_freq: Tune freq parameters of SSP(when in master mode) | |
260 | * @endian_rx: Endianess of Data in Rx FIFO | |
261 | * @endian_tx: Endianess of Data in Tx FIFO | |
262 | * @data_size: Width of data element(4 to 32 bits) | |
263 | * @com_mode: communication mode: polling, Interrupt or DMA | |
264 | * @rx_lev_trig: Rx FIFO watermark level (for IT & DMA mode) | |
265 | * @tx_lev_trig: Tx FIFO watermark level (for IT & DMA mode) | |
266 | * @clk_phase: Motorola SPI interface Clock phase | |
267 | * @clk_pol: Motorola SPI interface Clock polarity | |
268 | * @ctrl_len: Microwire interface: Control length | |
269 | * @wait_state: Microwire interface: Wait state | |
270 | * @duplex: Microwire interface: Full/Half duplex | |
781c7b12 LW |
271 | * @clkdelay: on the PL023 variant, the delay in feeback clock cycles |
272 | * before sampling the incoming line | |
b43d65f7 LW |
273 | * @cs_control: function pointer to board-specific function to |
274 | * assert/deassert I/O port to control HW generation of devices chip-select. | |
275 | * @dma_xfer_type: Type of DMA xfer (Mem-to-periph or Periph-to-Periph) | |
276 | * @dma_config: DMA configuration for SSP controller and peripheral | |
277 | */ | |
278 | struct pl022_config_chip { | |
b43d65f7 LW |
279 | enum ssp_interface iface; |
280 | enum ssp_hierarchy hierarchy; | |
281 | bool slave_tx_disable; | |
282 | struct ssp_clock_params clk_freq; | |
b43d65f7 LW |
283 | enum ssp_mode com_mode; |
284 | enum ssp_rx_level_trig rx_lev_trig; | |
285 | enum ssp_tx_level_trig tx_lev_trig; | |
b43d65f7 LW |
286 | enum ssp_microwire_ctrl_len ctrl_len; |
287 | enum ssp_microwire_wait_state wait_state; | |
288 | enum ssp_duplex duplex; | |
781c7b12 | 289 | enum ssp_clkdelay clkdelay; |
b43d65f7 LW |
290 | void (*cs_control) (u32 control); |
291 | }; | |
292 | ||
293 | #endif /* _SSP_PL022_H */ |