1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2003 Russell King, All Rights Reserved.
4 *
5 * This driver supports the following PXA CPU/SSP ports:-
6 *
7 * PXA250 SSP
8 * PXA255 SSP, NSSP
9 * PXA26x SSP, NSSP, ASSP
10 * PXA27x SSP1, SSP2, SSP3
11 * PXA3xx SSP1, SSP2, SSP3, SSP4
12 */
13
14 #ifndef __LINUX_SSP_H
15 #define __LINUX_SSP_H
16
17 #include <linux/bits.h>
18 #include <linux/compiler_types.h>
19 #include <linux/io.h>
20 #include <linux/kconfig.h>
21 #include <linux/list.h>
22 #include <linux/types.h>
23
24 struct clk;
25 struct device;
26 struct device_node;
27
28 /*
29 * SSP Serial Port Registers
30 * PXA250, PXA255, PXA26x and PXA27x SSP controllers are all slightly different.
31 * PXA255, PXA26x and PXA27x have extra ports, registers and bits.
32 */
33
34 #define SSCR0 (0x00) /* SSP Control Register 0 */
35 #define SSCR1 (0x04) /* SSP Control Register 1 */
36 #define SSSR (0x08) /* SSP Status Register */
37 #define SSITR (0x0C) /* SSP Interrupt Test Register */
38 #define SSDR (0x10) /* SSP Data Write/Data Read Register */
39
40 #define SSTO (0x28) /* SSP Time Out Register */
41 #define DDS_RATE (0x28) /* SSP DDS Clock Rate Register (Intel Quark) */
42 #define SSPSP (0x2C) /* SSP Programmable Serial Protocol */
43 #define SSTSA (0x30) /* SSP Tx Timeslot Active */
44 #define SSRSA (0x34) /* SSP Rx Timeslot Active */
45 #define SSTSS (0x38) /* SSP Timeslot Status */
46 #define SSACD (0x3C) /* SSP Audio Clock Divider */
47 #define SSACDD (0x40) /* SSP Audio Clock Dither Divider */
48
49 /* Common PXA2xx bits first */
50 #define SSCR0_DSS GENMASK(3, 0) /* Data Size Select (mask) */
51 #define SSCR0_DataSize(x) ((x) - 1) /* Data Size Select [4..16] */
52 #define SSCR0_FRF GENMASK(5, 4) /* FRame Format (mask) */
53 #define SSCR0_Motorola (0x0 << 4) /* Motorola's Serial Peripheral Interface (SPI) */
54 #define SSCR0_TI (0x1 << 4) /* Texas Instruments' Synchronous Serial Protocol (SSP) */
55 #define SSCR0_National (0x2 << 4) /* National Microwire */
56 #define SSCR0_ECS BIT(6) /* External clock select */
57 #define SSCR0_SSE BIT(7) /* Synchronous Serial Port Enable */
58 #define SSCR0_SCR(x) ((x) << 8) /* Serial Clock Rate (mask) */
59
60 /* PXA27x, PXA3xx */
61 #define SSCR0_EDSS BIT(20) /* Extended data size select */
62 #define SSCR0_NCS BIT(21) /* Network clock select */
63 #define SSCR0_RIM BIT(22) /* Receive FIFO overrrun interrupt mask */
64 #define SSCR0_TUM BIT(23) /* Transmit FIFO underrun interrupt mask */
65 #define SSCR0_FRDC GENMASK(26, 24) /* Frame rate divider control (mask) */
66 #define SSCR0_SlotsPerFrm(x) (((x) - 1) << 24) /* Time slots per frame [1..8] */
67 #define SSCR0_FPCKE BIT(29) /* FIFO packing enable */
68 #define SSCR0_ACS BIT(30) /* Audio clock select */
69 #define SSCR0_MOD BIT(31) /* Mode (normal or network) */
70
71 #define SSCR1_RIE BIT(0) /* Receive FIFO Interrupt Enable */
72 #define SSCR1_TIE BIT(1) /* Transmit FIFO Interrupt Enable */
73 #define SSCR1_LBM BIT(2) /* Loop-Back Mode */
74 #define SSCR1_SPO BIT(3) /* Motorola SPI SSPSCLK polarity setting */
75 #define SSCR1_SPH BIT(4) /* Motorola SPI SSPSCLK phase setting */
76 #define SSCR1_MWDS BIT(5) /* Microwire Transmit Data Size */
77
78 #define SSSR_ALT_FRM_MASK GENMASK(1, 0) /* Masks the SFRM signal number */
79 #define SSSR_TNF BIT(2) /* Transmit FIFO Not Full */
80 #define SSSR_RNE BIT(3) /* Receive FIFO Not Empty */
81 #define SSSR_BSY BIT(4) /* SSP Busy */
82 #define SSSR_TFS BIT(5) /* Transmit FIFO Service Request */
83 #define SSSR_RFS BIT(6) /* Receive FIFO Service Request */
84 #define SSSR_ROR BIT(7) /* Receive FIFO Overrun */
85
86 #define RX_THRESH_DFLT 8
87 #define TX_THRESH_DFLT 8
88
89 #define SSSR_TFL_MASK GENMASK(11, 8) /* Transmit FIFO Level mask */
90 #define SSSR_RFL_MASK GENMASK(15, 12) /* Receive FIFO Level mask */
91
92 #define SSCR1_TFT GENMASK(9, 6) /* Transmit FIFO Threshold (mask) */
93 #define SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..16] */
94 #define SSCR1_RFT GENMASK(13, 10) /* Receive FIFO Threshold (mask) */
95 #define SSCR1_RxTresh(x) (((x) - 1) << 10) /* level [1..16] */
96
97 #define RX_THRESH_CE4100_DFLT 2
98 #define TX_THRESH_CE4100_DFLT 2
99
100 #define CE4100_SSSR_TFL_MASK GENMASK(9, 8) /* Transmit FIFO Level mask */
101 #define CE4100_SSSR_RFL_MASK GENMASK(13, 12) /* Receive FIFO Level mask */
102
103 #define CE4100_SSCR1_TFT GENMASK(7, 6) /* Transmit FIFO Threshold (mask) */
104 #define CE4100_SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..4] */
105 #define CE4100_SSCR1_RFT GENMASK(11, 10) /* Receive FIFO Threshold (mask) */
106 #define CE4100_SSCR1_RxTresh(x) (((x) - 1) << 10) /* level [1..4] */
107
108 /* QUARK_X1000 SSCR0 bit definition */
109 #define QUARK_X1000_SSCR0_DSS GENMASK(4, 0) /* Data Size Select (mask) */
110 #define QUARK_X1000_SSCR0_DataSize(x) ((x) - 1) /* Data Size Select [4..32] */
111 #define QUARK_X1000_SSCR0_FRF GENMASK(6, 5) /* FRame Format (mask) */
112 #define QUARK_X1000_SSCR0_Motorola (0x0 << 5) /* Motorola's Serial Peripheral Interface (SPI) */
113
114 #define RX_THRESH_QUARK_X1000_DFLT 1
115 #define TX_THRESH_QUARK_X1000_DFLT 16
116
117 #define QUARK_X1000_SSSR_TFL_MASK GENMASK(12, 8) /* Transmit FIFO Level mask */
118 #define QUARK_X1000_SSSR_RFL_MASK GENMASK(17, 13) /* Receive FIFO Level mask */
119
120 #define QUARK_X1000_SSCR1_TFT GENMASK(10, 6) /* Transmit FIFO Threshold (mask) */
121 #define QUARK_X1000_SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..32] */
122 #define QUARK_X1000_SSCR1_RFT GENMASK(15, 11) /* Receive FIFO Threshold (mask) */
123 #define QUARK_X1000_SSCR1_RxTresh(x) (((x) - 1) << 11) /* level [1..32] */
124 #define QUARK_X1000_SSCR1_EFWR BIT(16) /* Enable FIFO Write/Read */
125 #define QUARK_X1000_SSCR1_STRF BIT(17) /* Select FIFO or EFWR */
126
127 /* extra bits in PXA255, PXA26x and PXA27x SSP ports */
128 #define SSCR0_TISSP (1 << 4) /* TI Sync Serial Protocol */
129 #define SSCR0_PSP (3 << 4) /* PSP - Programmable Serial Protocol */
130
131 #define SSCR1_EFWR BIT(14) /* Enable FIFO Write/Read */
132 #define SSCR1_STRF BIT(15) /* Select FIFO or EFWR */
133 #define SSCR1_IFS BIT(16) /* Invert Frame Signal */
134 #define SSCR1_PINTE BIT(18) /* Peripheral Trailing Byte Interrupt Enable */
135 #define SSCR1_TINTE BIT(19) /* Receiver Time-out Interrupt enable */
136 #define SSCR1_RSRE BIT(20) /* Receive Service Request Enable */
137 #define SSCR1_TSRE BIT(21) /* Transmit Service Request Enable */
138 #define SSCR1_TRAIL BIT(22) /* Trailing Byte */
139 #define SSCR1_RWOT BIT(23) /* Receive Without Transmit */
140 #define SSCR1_SFRMDIR BIT(24) /* Frame Direction */
141 #define SSCR1_SCLKDIR BIT(25) /* Serial Bit Rate Clock Direction */
142 #define SSCR1_ECRB BIT(26) /* Enable Clock request B */
143 #define SSCR1_ECRA BIT(27) /* Enable Clock Request A */
144 #define SSCR1_SCFR BIT(28) /* Slave Clock free Running */
145 #define SSCR1_EBCEI BIT(29) /* Enable Bit Count Error interrupt */
146 #define SSCR1_TTE BIT(30) /* TXD Tristate Enable */
147 #define SSCR1_TTELP BIT(31) /* TXD Tristate Enable Last Phase */
148
149 #define SSSR_PINT BIT(18) /* Peripheral Trailing Byte Interrupt */
150 #define SSSR_TINT BIT(19) /* Receiver Time-out Interrupt */
151 #define SSSR_EOC BIT(20) /* End Of Chain */
152 #define SSSR_TUR BIT(21) /* Transmit FIFO Under Run */
153 #define SSSR_CSS BIT(22) /* Clock Synchronisation Status */
154 #define SSSR_BCE BIT(23) /* Bit Count Error */
155
156 #define SSPSP_SCMODE(x) ((x) << 0) /* Serial Bit Rate Clock Mode */
157 #define SSPSP_SFRMP BIT(2) /* Serial Frame Polarity */
158 #define SSPSP_ETDS BIT(3) /* End of Transfer data State */
159 #define SSPSP_STRTDLY(x) ((x) << 4) /* Start Delay */
160 #define SSPSP_DMYSTRT(x) ((x) << 7) /* Dummy Start */
161 #define SSPSP_SFRMDLY(x) ((x) << 9) /* Serial Frame Delay */
162 #define SSPSP_SFRMWDTH(x) ((x) << 16) /* Serial Frame Width */
163 #define SSPSP_DMYSTOP(x) ((x) << 23) /* Dummy Stop */
164 #define SSPSP_FSRT BIT(25) /* Frame Sync Relative Timing */
165
166 /* PXA3xx */
167 #define SSPSP_EDMYSTRT(x) ((x) << 26) /* Extended Dummy Start */
168 #define SSPSP_EDMYSTOP(x) ((x) << 28) /* Extended Dummy Stop */
169 #define SSPSP_TIMING_MASK (0x7f8001f0)
170
171 #define SSACD_ACDS(x) ((x) << 0) /* Audio clock divider select */
172 #define SSACD_ACDS_1 (0)
173 #define SSACD_ACDS_2 (1)
174 #define SSACD_ACDS_4 (2)
175 #define SSACD_ACDS_8 (3)
176 #define SSACD_ACDS_16 (4)
177 #define SSACD_ACDS_32 (5)
178 #define SSACD_SCDB BIT(3) /* SSPSYSCLK Divider Bypass */
179 #define SSACD_SCDB_4X (0)
180 #define SSACD_SCDB_1X (1)
181 #define SSACD_ACPS(x) ((x) << 4) /* Audio clock PLL select */
182 #define SSACD_SCDX8 BIT(7) /* SYSCLK division ratio select */
183
184 /* LPSS SSP */
185 #define SSITF 0x44 /* TX FIFO trigger level */
186 #define SSITF_TxHiThresh(x) (((x) - 1) << 0)
187 #define SSITF_TxLoThresh(x) (((x) - 1) << 8)
188
189 #define SSIRF 0x48 /* RX FIFO trigger level */
190 #define SSIRF_RxThresh(x) ((x) - 1)
191
192 /* LPT/WPT SSP */
193 #define SSCR2 (0x40) /* SSP Command / Status 2 */
194 #define SSPSP2 (0x44) /* SSP Programmable Serial Protocol 2 */
195
196 enum pxa_ssp_type {
197 SSP_UNDEFINED = 0,
198 PXA25x_SSP, /* pxa 210, 250, 255, 26x */
199 PXA25x_NSSP, /* pxa 255, 26x (including ASSP) */
200 PXA27x_SSP,
201 PXA3xx_SSP,
202 PXA168_SSP,
203 MMP2_SSP,
204 PXA910_SSP,
205 CE4100_SSP,
206 QUARK_X1000_SSP,
207 LPSS_LPT_SSP, /* Keep LPSS types sorted with lpss_platforms[] */
208 LPSS_BYT_SSP,
209 LPSS_BSW_SSP,
210 LPSS_SPT_SSP,
211 LPSS_BXT_SSP,
212 LPSS_CNL_SSP,
213 };
214
215 struct ssp_device {
216 struct device *dev;
217 struct list_head node;
218
219 struct clk *clk;
220 void __iomem *mmio_base;
221 unsigned long phys_base;
222
223 const char *label;
224 int port_id;
225 enum pxa_ssp_type type;
226 int use_count;
227 int irq;
228
229 struct device_node *of_node;
230 };
231
232 /**
233 * pxa_ssp_write_reg - Write to a SSP register
234 *
235 * @dev: SSP device to access
236 * @reg: Register to write to
237 * @val: Value to be written.
238 */
pxa_ssp_write_reg(struct ssp_device * dev,u32 reg,u32 val)239 static inline void pxa_ssp_write_reg(struct ssp_device *dev, u32 reg, u32 val)
240 {
241 __raw_writel(val, dev->mmio_base + reg);
242 }
243
244 /**
245 * pxa_ssp_read_reg - Read from a SSP register
246 *
247 * @dev: SSP device to access
248 * @reg: Register to read from
249 */
pxa_ssp_read_reg(struct ssp_device * dev,u32 reg)250 static inline u32 pxa_ssp_read_reg(struct ssp_device *dev, u32 reg)
251 {
252 return __raw_readl(dev->mmio_base + reg);
253 }
254
255 #if IS_ENABLED(CONFIG_PXA_SSP)
256 struct ssp_device *pxa_ssp_request(int port, const char *label);
257 void pxa_ssp_free(struct ssp_device *);
258 struct ssp_device *pxa_ssp_request_of(const struct device_node *of_node,
259 const char *label);
260 #else
pxa_ssp_request(int port,const char * label)261 static inline struct ssp_device *pxa_ssp_request(int port, const char *label)
262 {
263 return NULL;
264 }
pxa_ssp_request_of(const struct device_node * n,const char * name)265 static inline struct ssp_device *pxa_ssp_request_of(const struct device_node *n,
266 const char *name)
267 {
268 return NULL;
269 }
pxa_ssp_free(struct ssp_device * ssp)270 static inline void pxa_ssp_free(struct ssp_device *ssp) {}
271 #endif
272
273 #endif
274