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_PXA2XX_SSP_H
15#define __LINUX_PXA2XX_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
24struct clk;
25struct device;
26struct 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 SSPSP (0x2C) /* SSP Programmable Serial Protocol */
42#define SSTSA (0x30) /* SSP Tx Timeslot Active */
43#define SSRSA (0x34) /* SSP Rx Timeslot Active */
44#define SSTSS (0x38) /* SSP Timeslot Status */
45#define SSACD (0x3C) /* SSP Audio Clock Divider */
46#define SSACDD (0x40) /* SSP Audio Clock Dither Divider */
47
48/* Common PXA2xx bits first */
49#define SSCR0_DSS GENMASK(3, 0) /* Data Size Select (mask) */
50#define SSCR0_DataSize(x) ((x) - 1) /* Data Size Select [4..16] */
51#define SSCR0_FRF GENMASK(5, 4) /* FRame Format (mask) */
52#define SSCR0_Motorola (0x0 << 4) /* Motorola's Serial Peripheral Interface (SPI) */
53#define SSCR0_TI (0x1 << 4) /* Texas Instruments' Synchronous Serial Protocol (SSP) */
54#define SSCR0_National (0x2 << 4) /* National Microwire */
55#define SSCR0_ECS BIT(6) /* External clock select */
56#define SSCR0_SSE BIT(7) /* Synchronous Serial Port Enable */
57#define SSCR0_SCR(x) ((x) << 8) /* Serial Clock Rate (mask) */
58
59/* PXA27x, PXA3xx */
60#define SSCR0_EDSS BIT(20) /* Extended data size select */
61#define SSCR0_NCS BIT(21) /* Network clock select */
62#define SSCR0_RIM BIT(22) /* Receive FIFO overrun interrupt mask */
63#define SSCR0_TUM BIT(23) /* Transmit FIFO underrun interrupt mask */
64#define SSCR0_FRDC GENMASK(26, 24) /* Frame rate divider control (mask) */
65#define SSCR0_SlotsPerFrm(x) (((x) - 1) << 24) /* Time slots per frame [1..8] */
66#define SSCR0_FPCKE BIT(29) /* FIFO packing enable */
67#define SSCR0_ACS BIT(30) /* Audio clock select */
68#define SSCR0_MOD BIT(31) /* Mode (normal or network) */
69
70#define SSCR1_RIE BIT(0) /* Receive FIFO Interrupt Enable */
71#define SSCR1_TIE BIT(1) /* Transmit FIFO Interrupt Enable */
72#define SSCR1_LBM BIT(2) /* Loop-Back Mode */
73#define SSCR1_SPO BIT(3) /* Motorola SPI SSPSCLK polarity setting */
74#define SSCR1_SPH BIT(4) /* Motorola SPI SSPSCLK phase setting */
75#define SSCR1_MWDS BIT(5) /* Microwire Transmit Data Size */
76
77#define SSSR_ALT_FRM_MASK GENMASK(1, 0) /* Masks the SFRM signal number */
78#define SSSR_TNF BIT(2) /* Transmit FIFO Not Full */
79#define SSSR_RNE BIT(3) /* Receive FIFO Not Empty */
80#define SSSR_BSY BIT(4) /* SSP Busy */
81#define SSSR_TFS BIT(5) /* Transmit FIFO Service Request */
82#define SSSR_RFS BIT(6) /* Receive FIFO Service Request */
83#define SSSR_ROR BIT(7) /* Receive FIFO Overrun */
84
85#define RX_THRESH_DFLT 8
86#define TX_THRESH_DFLT 8
87
88#define SSSR_TFL_MASK GENMASK(11, 8) /* Transmit FIFO Level mask */
89#define SSSR_RFL_MASK GENMASK(15, 12) /* Receive FIFO Level mask */
90
91#define SSCR1_TFT GENMASK(9, 6) /* Transmit FIFO Threshold (mask) */
92#define SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..16] */
93#define SSCR1_RFT GENMASK(13, 10) /* Receive FIFO Threshold (mask) */
94#define SSCR1_RxTresh(x) (((x) - 1) << 10) /* level [1..16] */
95
96#define RX_THRESH_CE4100_DFLT 2
97#define TX_THRESH_CE4100_DFLT 2
98
99#define CE4100_SSSR_TFL_MASK GENMASK(9, 8) /* Transmit FIFO Level mask */
100#define CE4100_SSSR_RFL_MASK GENMASK(13, 12) /* Receive FIFO Level mask */
101
102#define CE4100_SSCR1_TFT GENMASK(7, 6) /* Transmit FIFO Threshold (mask) */
103#define CE4100_SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..4] */
104#define CE4100_SSCR1_RFT GENMASK(11, 10) /* Receive FIFO Threshold (mask) */
105#define CE4100_SSCR1_RxTresh(x) (((x) - 1) << 10) /* level [1..4] */
106
107/* Intel Quark X1000 */
108#define DDS_RATE 0x28 /* SSP DDS Clock Rate Register */
109
110/* QUARK_X1000 SSCR0 bit definition */
111#define QUARK_X1000_SSCR0_DSS GENMASK(4, 0) /* Data Size Select (mask) */
112#define QUARK_X1000_SSCR0_DataSize(x) ((x) - 1) /* Data Size Select [4..32] */
113#define QUARK_X1000_SSCR0_FRF GENMASK(6, 5) /* FRame Format (mask) */
114#define QUARK_X1000_SSCR0_Motorola (0x0 << 5) /* Motorola's Serial Peripheral Interface (SPI) */
115
116#define RX_THRESH_QUARK_X1000_DFLT 1
117#define TX_THRESH_QUARK_X1000_DFLT 16
118
119#define QUARK_X1000_SSSR_TFL_MASK GENMASK(12, 8) /* Transmit FIFO Level mask */
120#define QUARK_X1000_SSSR_RFL_MASK GENMASK(17, 13) /* Receive FIFO Level mask */
121
122#define QUARK_X1000_SSCR1_TFT GENMASK(10, 6) /* Transmit FIFO Threshold (mask) */
123#define QUARK_X1000_SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..32] */
124#define QUARK_X1000_SSCR1_RFT GENMASK(15, 11) /* Receive FIFO Threshold (mask) */
125#define QUARK_X1000_SSCR1_RxTresh(x) (((x) - 1) << 11) /* level [1..32] */
126#define QUARK_X1000_SSCR1_EFWR BIT(16) /* Enable FIFO Write/Read */
127#define QUARK_X1000_SSCR1_STRF BIT(17) /* Select FIFO or EFWR */
128
129/* Extra bits in PXA255, PXA26x and PXA27x SSP ports */
130#define SSCR0_TISSP (1 << 4) /* TI Sync Serial Protocol */
131#define SSCR0_PSP (3 << 4) /* PSP - Programmable Serial Protocol */
132
133#define SSCR1_EFWR BIT(14) /* Enable FIFO Write/Read */
134#define SSCR1_STRF BIT(15) /* Select FIFO or EFWR */
135#define SSCR1_IFS BIT(16) /* Invert Frame Signal */
136#define SSCR1_PINTE BIT(18) /* Peripheral Trailing Byte Interrupt Enable */
137#define SSCR1_TINTE BIT(19) /* Receiver Time-out Interrupt enable */
138#define SSCR1_RSRE BIT(20) /* Receive Service Request Enable */
139#define SSCR1_TSRE BIT(21) /* Transmit Service Request Enable */
140#define SSCR1_TRAIL BIT(22) /* Trailing Byte */
141#define SSCR1_RWOT BIT(23) /* Receive Without Transmit */
142#define SSCR1_SFRMDIR BIT(24) /* Frame Direction */
143#define SSCR1_SCLKDIR BIT(25) /* Serial Bit Rate Clock Direction */
144#define SSCR1_ECRB BIT(26) /* Enable Clock request B */
145#define SSCR1_ECRA BIT(27) /* Enable Clock Request A */
146#define SSCR1_SCFR BIT(28) /* Slave Clock free Running */
147#define SSCR1_EBCEI BIT(29) /* Enable Bit Count Error interrupt */
148#define SSCR1_TTE BIT(30) /* TXD Tristate Enable */
149#define SSCR1_TTELP BIT(31) /* TXD Tristate Enable Last Phase */
150
151#define SSSR_PINT BIT(18) /* Peripheral Trailing Byte Interrupt */
152#define SSSR_TINT BIT(19) /* Receiver Time-out Interrupt */
153#define SSSR_EOC BIT(20) /* End Of Chain */
154#define SSSR_TUR BIT(21) /* Transmit FIFO Under Run */
155#define SSSR_CSS BIT(22) /* Clock Synchronisation Status */
156#define SSSR_BCE BIT(23) /* Bit Count Error */
157
158#define SSPSP_SCMODE(x) ((x) << 0) /* Serial Bit Rate Clock Mode */
159#define SSPSP_SFRMP BIT(2) /* Serial Frame Polarity */
160#define SSPSP_ETDS BIT(3) /* End of Transfer data State */
161#define SSPSP_STRTDLY(x) ((x) << 4) /* Start Delay */
162#define SSPSP_DMYSTRT(x) ((x) << 7) /* Dummy Start */
163#define SSPSP_SFRMDLY(x) ((x) << 9) /* Serial Frame Delay */
164#define SSPSP_SFRMWDTH(x) ((x) << 16) /* Serial Frame Width */
165#define SSPSP_DMYSTOP(x) ((x) << 23) /* Dummy Stop */
166#define SSPSP_FSRT BIT(25) /* Frame Sync Relative Timing */
167
168/* PXA3xx */
169#define SSPSP_EDMYSTRT(x) ((x) << 26) /* Extended Dummy Start */
170#define SSPSP_EDMYSTOP(x) ((x) << 28) /* Extended Dummy Stop */
171#define SSPSP_TIMING_MASK (0x7f8001f0)
172
173#define SSACD_ACDS(x) ((x) << 0) /* Audio clock divider select */
174#define SSACD_ACDS_1 (0)
175#define SSACD_ACDS_2 (1)
176#define SSACD_ACDS_4 (2)
177#define SSACD_ACDS_8 (3)
178#define SSACD_ACDS_16 (4)
179#define SSACD_ACDS_32 (5)
180#define SSACD_SCDB BIT(3) /* SSPSYSCLK Divider Bypass */
181#define SSACD_SCDB_4X (0)
182#define SSACD_SCDB_1X (1)
183#define SSACD_ACPS(x) ((x) << 4) /* Audio clock PLL select */
184#define SSACD_SCDX8 BIT(7) /* SYSCLK division ratio select */
185
186/* Intel Merrifield SSP */
187#define SFIFOL 0x68 /* FIFO level */
188#define SFIFOTT 0x6c /* FIFO trigger threshold */
189
190#define RX_THRESH_MRFLD_DFLT 16
191#define TX_THRESH_MRFLD_DFLT 16
192
193#define SFIFOL_TFL_MASK GENMASK(15, 0) /* Transmit FIFO Level mask */
194#define SFIFOL_RFL_MASK GENMASK(31, 16) /* Receive FIFO Level mask */
195
196#define SFIFOTT_TFT GENMASK(15, 0) /* Transmit FIFO Threshold (mask) */
197#define SFIFOTT_TxThresh(x) (((x) - 1) << 0) /* TX FIFO trigger threshold / level */
198#define SFIFOTT_RFT GENMASK(31, 16) /* Receive FIFO Threshold (mask) */
199#define SFIFOTT_RxThresh(x) (((x) - 1) << 16) /* RX FIFO trigger threshold / level */
200
201/* LPSS SSP */
202#define SSITF 0x44 /* TX FIFO trigger level */
203#define SSITF_TxHiThresh(x) (((x) - 1) << 0)
204#define SSITF_TxLoThresh(x) (((x) - 1) << 8)
205
206#define SSIRF 0x48 /* RX FIFO trigger level */
207#define SSIRF_RxThresh(x) ((x) - 1)
208
209/* LPT/WPT SSP */
210#define SSCR2 (0x40) /* SSP Command / Status 2 */
211#define SSPSP2 (0x44) /* SSP Programmable Serial Protocol 2 */
212
213enum pxa_ssp_type {
214 SSP_UNDEFINED = 0,
215 PXA25x_SSP, /* pxa 210, 250, 255, 26x */
216 PXA25x_NSSP, /* pxa 255, 26x (including ASSP) */
217 PXA27x_SSP,
218 PXA3xx_SSP,
219 PXA168_SSP,
220 PXA910_SSP,
221 CE4100_SSP,
222 MMP2_SSP,
223 MRFLD_SSP,
224 QUARK_X1000_SSP,
225 /* Keep LPSS types sorted with lpss_platforms[] */
226 LPSS_LPT_SSP,
227 LPSS_BYT_SSP,
228 LPSS_BSW_SSP,
229 LPSS_SPT_SSP,
230 LPSS_BXT_SSP,
231 LPSS_CNL_SSP,
232 SSP_MAX
233};
234
235struct ssp_device {
236 struct device *dev;
237 struct list_head node;
238
239 struct clk *clk;
240 void __iomem *mmio_base;
241 unsigned long phys_base;
242
243 const char *label;
244 int port_id;
245 enum pxa_ssp_type type;
246 int use_count;
247 int irq;
248
249 struct device_node *of_node;
250};
251
252/**
253 * pxa_ssp_write_reg - Write to a SSP register
254 *
255 * @dev: SSP device to access
256 * @reg: Register to write to
257 * @val: Value to be written.
258 */
259static inline void pxa_ssp_write_reg(struct ssp_device *dev, u32 reg, u32 val)
260{
261 __raw_writel(val, addr: dev->mmio_base + reg);
262}
263
264/**
265 * pxa_ssp_read_reg - Read from a SSP register
266 *
267 * @dev: SSP device to access
268 * @reg: Register to read from
269 */
270static inline u32 pxa_ssp_read_reg(struct ssp_device *dev, u32 reg)
271{
272 return __raw_readl(addr: dev->mmio_base + reg);
273}
274
275static inline void pxa_ssp_enable(struct ssp_device *ssp)
276{
277 u32 sscr0;
278
279 sscr0 = pxa_ssp_read_reg(dev: ssp, SSCR0) | SSCR0_SSE;
280 pxa_ssp_write_reg(dev: ssp, SSCR0, val: sscr0);
281}
282
283static inline void pxa_ssp_disable(struct ssp_device *ssp)
284{
285 u32 sscr0;
286
287 sscr0 = pxa_ssp_read_reg(dev: ssp, SSCR0) & ~SSCR0_SSE;
288 pxa_ssp_write_reg(dev: ssp, SSCR0, val: sscr0);
289}
290
291#if IS_ENABLED(CONFIG_PXA_SSP)
292struct ssp_device *pxa_ssp_request(int port, const char *label);
293void pxa_ssp_free(struct ssp_device *);
294struct ssp_device *pxa_ssp_request_of(const struct device_node *of_node,
295 const char *label);
296#else
297static inline struct ssp_device *pxa_ssp_request(int port, const char *label)
298{
299 return NULL;
300}
301static inline struct ssp_device *pxa_ssp_request_of(const struct device_node *n,
302 const char *name)
303{
304 return NULL;
305}
306static inline void pxa_ssp_free(struct ssp_device *ssp) {}
307#endif
308
309#endif /* __LINUX_PXA2XX_SSP_H */
310

source code of linux/include/linux/pxa2xx_ssp.h