Commit | Line | Data |
---|---|---|
010d442c KS |
1 | /* |
2 | * TI OMAP I2C master mode driver | |
3 | * | |
4 | * Copyright (C) 2003 MontaVista Software, Inc. | |
010d442c | 5 | * Copyright (C) 2005 Nokia Corporation |
c1a473bd | 6 | * Copyright (C) 2004 - 2007 Texas Instruments. |
010d442c | 7 | * |
c1a473bd TL |
8 | * Originally written by MontaVista Software, Inc. |
9 | * Additional contributions by: | |
10 | * Tony Lindgren <tony@atomide.com> | |
11 | * Imre Deak <imre.deak@nokia.com> | |
12 | * Juha Yrjölä <juha.yrjola@solidboot.com> | |
13 | * Syed Khasim <x0khasim@ti.com> | |
14 | * Nishant Menon <nm@ti.com> | |
010d442c KS |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License as published by | |
18 | * the Free Software Foundation; either version 2 of the License, or | |
19 | * (at your option) any later version. | |
20 | * | |
21 | * This program is distributed in the hope that it will be useful, | |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
010d442c KS |
25 | */ |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/i2c.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/completion.h> | |
33 | #include <linux/platform_device.h> | |
34 | #include <linux/clk.h> | |
c1a473bd | 35 | #include <linux/io.h> |
6145197b | 36 | #include <linux/of.h> |
6145197b | 37 | #include <linux/of_device.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
20c9d2c4 | 39 | #include <linux/i2c-omap.h> |
27b1fec2 | 40 | #include <linux/pm_runtime.h> |
010d442c | 41 | |
9c76b878 | 42 | /* I2C controller revisions */ |
4e80f727 | 43 | #define OMAP_I2C_OMAP1_REV_2 0x20 |
9c76b878 PW |
44 | |
45 | /* I2C controller revisions present on specific hardware */ | |
47dcd016 S |
46 | #define OMAP_I2C_REV_ON_2430 0x00000036 |
47 | #define OMAP_I2C_REV_ON_3430_3530 0x0000003C | |
48 | #define OMAP_I2C_REV_ON_3630 0x00000040 | |
49 | #define OMAP_I2C_REV_ON_4430_PLUS 0x50400002 | |
9c76b878 | 50 | |
010d442c KS |
51 | /* timeout waiting for the controller to respond */ |
52 | #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000)) | |
53 | ||
6d8451d5 FB |
54 | /* timeout for pm runtime autosuspend */ |
55 | #define OMAP_I2C_PM_TIMEOUT 1000 /* ms */ | |
56 | ||
0f5768bf AK |
57 | /* timeout for making decision on bus free status */ |
58 | #define OMAP_I2C_BUS_FREE_TIMEOUT (msecs_to_jiffies(10)) | |
59 | ||
5043e9e7 | 60 | /* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */ |
f38e66e0 SS |
61 | enum { |
62 | OMAP_I2C_REV_REG = 0, | |
63 | OMAP_I2C_IE_REG, | |
64 | OMAP_I2C_STAT_REG, | |
65 | OMAP_I2C_IV_REG, | |
66 | OMAP_I2C_WE_REG, | |
67 | OMAP_I2C_SYSS_REG, | |
68 | OMAP_I2C_BUF_REG, | |
69 | OMAP_I2C_CNT_REG, | |
70 | OMAP_I2C_DATA_REG, | |
71 | OMAP_I2C_SYSC_REG, | |
72 | OMAP_I2C_CON_REG, | |
73 | OMAP_I2C_OA_REG, | |
74 | OMAP_I2C_SA_REG, | |
75 | OMAP_I2C_PSC_REG, | |
76 | OMAP_I2C_SCLL_REG, | |
77 | OMAP_I2C_SCLH_REG, | |
78 | OMAP_I2C_SYSTEST_REG, | |
79 | OMAP_I2C_BUFSTAT_REG, | |
b8853088 AG |
80 | /* only on OMAP4430 */ |
81 | OMAP_I2C_IP_V2_REVNB_LO, | |
82 | OMAP_I2C_IP_V2_REVNB_HI, | |
83 | OMAP_I2C_IP_V2_IRQSTATUS_RAW, | |
84 | OMAP_I2C_IP_V2_IRQENABLE_SET, | |
85 | OMAP_I2C_IP_V2_IRQENABLE_CLR, | |
f38e66e0 | 86 | }; |
010d442c KS |
87 | |
88 | /* I2C Interrupt Enable Register (OMAP_I2C_IE): */ | |
b6ee52c3 NM |
89 | #define OMAP_I2C_IE_XDR (1 << 14) /* TX Buffer drain int enable */ |
90 | #define OMAP_I2C_IE_RDR (1 << 13) /* RX Buffer drain int enable */ | |
010d442c KS |
91 | #define OMAP_I2C_IE_XRDY (1 << 4) /* TX data ready int enable */ |
92 | #define OMAP_I2C_IE_RRDY (1 << 3) /* RX data ready int enable */ | |
93 | #define OMAP_I2C_IE_ARDY (1 << 2) /* Access ready int enable */ | |
94 | #define OMAP_I2C_IE_NACK (1 << 1) /* No ack interrupt enable */ | |
95 | #define OMAP_I2C_IE_AL (1 << 0) /* Arbitration lost int ena */ | |
96 | ||
97 | /* I2C Status Register (OMAP_I2C_STAT): */ | |
b6ee52c3 NM |
98 | #define OMAP_I2C_STAT_XDR (1 << 14) /* TX Buffer draining */ |
99 | #define OMAP_I2C_STAT_RDR (1 << 13) /* RX Buffer draining */ | |
010d442c KS |
100 | #define OMAP_I2C_STAT_BB (1 << 12) /* Bus busy */ |
101 | #define OMAP_I2C_STAT_ROVR (1 << 11) /* Receive overrun */ | |
102 | #define OMAP_I2C_STAT_XUDF (1 << 10) /* Transmit underflow */ | |
103 | #define OMAP_I2C_STAT_AAS (1 << 9) /* Address as slave */ | |
9fd6ada8 | 104 | #define OMAP_I2C_STAT_BF (1 << 8) /* Bus Free */ |
010d442c KS |
105 | #define OMAP_I2C_STAT_XRDY (1 << 4) /* Transmit data ready */ |
106 | #define OMAP_I2C_STAT_RRDY (1 << 3) /* Receive data ready */ | |
107 | #define OMAP_I2C_STAT_ARDY (1 << 2) /* Register access ready */ | |
108 | #define OMAP_I2C_STAT_NACK (1 << 1) /* No ack interrupt enable */ | |
109 | #define OMAP_I2C_STAT_AL (1 << 0) /* Arbitration lost int ena */ | |
110 | ||
5043e9e7 KJ |
111 | /* I2C WE wakeup enable register */ |
112 | #define OMAP_I2C_WE_XDR_WE (1 << 14) /* TX drain wakup */ | |
113 | #define OMAP_I2C_WE_RDR_WE (1 << 13) /* RX drain wakeup */ | |
114 | #define OMAP_I2C_WE_AAS_WE (1 << 9) /* Address as slave wakeup*/ | |
115 | #define OMAP_I2C_WE_BF_WE (1 << 8) /* Bus free wakeup */ | |
116 | #define OMAP_I2C_WE_STC_WE (1 << 6) /* Start condition wakeup */ | |
117 | #define OMAP_I2C_WE_GC_WE (1 << 5) /* General call wakeup */ | |
118 | #define OMAP_I2C_WE_DRDY_WE (1 << 3) /* TX/RX data ready wakeup */ | |
119 | #define OMAP_I2C_WE_ARDY_WE (1 << 2) /* Reg access ready wakeup */ | |
120 | #define OMAP_I2C_WE_NACK_WE (1 << 1) /* No acknowledgment wakeup */ | |
121 | #define OMAP_I2C_WE_AL_WE (1 << 0) /* Arbitration lost wakeup */ | |
122 | ||
123 | #define OMAP_I2C_WE_ALL (OMAP_I2C_WE_XDR_WE | OMAP_I2C_WE_RDR_WE | \ | |
124 | OMAP_I2C_WE_AAS_WE | OMAP_I2C_WE_BF_WE | \ | |
125 | OMAP_I2C_WE_STC_WE | OMAP_I2C_WE_GC_WE | \ | |
126 | OMAP_I2C_WE_DRDY_WE | OMAP_I2C_WE_ARDY_WE | \ | |
127 | OMAP_I2C_WE_NACK_WE | OMAP_I2C_WE_AL_WE) | |
128 | ||
010d442c KS |
129 | /* I2C Buffer Configuration Register (OMAP_I2C_BUF): */ |
130 | #define OMAP_I2C_BUF_RDMA_EN (1 << 15) /* RX DMA channel enable */ | |
b6ee52c3 | 131 | #define OMAP_I2C_BUF_RXFIF_CLR (1 << 14) /* RX FIFO Clear */ |
010d442c | 132 | #define OMAP_I2C_BUF_XDMA_EN (1 << 7) /* TX DMA channel enable */ |
b6ee52c3 | 133 | #define OMAP_I2C_BUF_TXFIF_CLR (1 << 6) /* TX FIFO Clear */ |
010d442c KS |
134 | |
135 | /* I2C Configuration Register (OMAP_I2C_CON): */ | |
136 | #define OMAP_I2C_CON_EN (1 << 15) /* I2C module enable */ | |
137 | #define OMAP_I2C_CON_BE (1 << 14) /* Big endian mode */ | |
b6ee52c3 | 138 | #define OMAP_I2C_CON_OPMODE_HS (1 << 12) /* High Speed support */ |
010d442c KS |
139 | #define OMAP_I2C_CON_STB (1 << 11) /* Start byte mode (master) */ |
140 | #define OMAP_I2C_CON_MST (1 << 10) /* Master/slave mode */ | |
141 | #define OMAP_I2C_CON_TRX (1 << 9) /* TX/RX mode (master only) */ | |
142 | #define OMAP_I2C_CON_XA (1 << 8) /* Expand address */ | |
143 | #define OMAP_I2C_CON_RM (1 << 2) /* Repeat mode (master only) */ | |
144 | #define OMAP_I2C_CON_STP (1 << 1) /* Stop cond (master only) */ | |
145 | #define OMAP_I2C_CON_STT (1 << 0) /* Start condition (master) */ | |
146 | ||
4574eb68 SMK |
147 | /* I2C SCL time value when Master */ |
148 | #define OMAP_I2C_SCLL_HSSCLL 8 | |
149 | #define OMAP_I2C_SCLH_HSSCLH 8 | |
150 | ||
010d442c | 151 | /* I2C System Test Register (OMAP_I2C_SYSTEST): */ |
010d442c KS |
152 | #define OMAP_I2C_SYSTEST_ST_EN (1 << 15) /* System test enable */ |
153 | #define OMAP_I2C_SYSTEST_FREE (1 << 14) /* Free running mode */ | |
154 | #define OMAP_I2C_SYSTEST_TMODE_MASK (3 << 12) /* Test mode select */ | |
155 | #define OMAP_I2C_SYSTEST_TMODE_SHIFT (12) /* Test mode select */ | |
9fd6ada8 AK |
156 | /* Functional mode */ |
157 | #define OMAP_I2C_SYSTEST_SCL_I_FUNC (1 << 8) /* SCL line input value */ | |
158 | #define OMAP_I2C_SYSTEST_SCL_O_FUNC (1 << 7) /* SCL line output value */ | |
159 | #define OMAP_I2C_SYSTEST_SDA_I_FUNC (1 << 6) /* SDA line input value */ | |
160 | #define OMAP_I2C_SYSTEST_SDA_O_FUNC (1 << 5) /* SDA line output value */ | |
161 | /* SDA/SCL IO mode */ | |
010d442c KS |
162 | #define OMAP_I2C_SYSTEST_SCL_I (1 << 3) /* SCL line sense in */ |
163 | #define OMAP_I2C_SYSTEST_SCL_O (1 << 2) /* SCL line drive out */ | |
164 | #define OMAP_I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense in */ | |
165 | #define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */ | |
010d442c | 166 | |
fdd07fe6 PW |
167 | /* OCP_SYSSTATUS bit definitions */ |
168 | #define SYSS_RESETDONE_MASK (1 << 0) | |
169 | ||
170 | /* OCP_SYSCONFIG bit definitions */ | |
171 | #define SYSC_CLOCKACTIVITY_MASK (0x3 << 8) | |
172 | #define SYSC_SIDLEMODE_MASK (0x3 << 3) | |
173 | #define SYSC_ENAWAKEUP_MASK (1 << 2) | |
174 | #define SYSC_SOFTRESET_MASK (1 << 1) | |
175 | #define SYSC_AUTOIDLE_MASK (1 << 0) | |
176 | ||
177 | #define SYSC_IDLEMODE_SMART 0x2 | |
178 | #define SYSC_CLOCKACTIVITY_FCLK 0x2 | |
010d442c | 179 | |
f3083d92 | 180 | /* Errata definitions */ |
181 | #define I2C_OMAP_ERRATA_I207 (1 << 0) | |
c8db38f0 | 182 | #define I2C_OMAP_ERRATA_I462 (1 << 1) |
010d442c | 183 | |
4368de19 OD |
184 | #define OMAP_I2C_IP_V2_INTERRUPTS_MASK 0x6FFF |
185 | ||
010d442c | 186 | struct omap_i2c_dev { |
3b2f8f82 | 187 | spinlock_t lock; /* IRQ synchronization */ |
010d442c KS |
188 | struct device *dev; |
189 | void __iomem *base; /* virtual */ | |
190 | int irq; | |
d84d3ea3 | 191 | int reg_shift; /* bit shift for I2C register addresses */ |
010d442c KS |
192 | struct completion cmd_complete; |
193 | struct resource *ioarea; | |
49839dc9 PW |
194 | u32 latency; /* maximum mpu wkup latency */ |
195 | void (*set_mpu_wkup_lat)(struct device *dev, | |
196 | long latency); | |
6145197b | 197 | u32 speed; /* Speed of bus in kHz */ |
6145197b | 198 | u32 flags; |
4368de19 | 199 | u16 scheme; |
010d442c KS |
200 | u16 cmd_err; |
201 | u8 *buf; | |
f38e66e0 | 202 | u8 *regs; |
010d442c KS |
203 | size_t buf_len; |
204 | struct i2c_adapter adapter; | |
dd74548d | 205 | u8 threshold; |
b6ee52c3 NM |
206 | u8 fifo_size; /* use as flag and value |
207 | * fifo_size==0 implies no fifo | |
208 | * if set, should be trsh+1 | |
209 | */ | |
47dcd016 | 210 | u32 rev; |
b6ee52c3 | 211 | unsigned b_hw:1; /* bad h/w fixes */ |
0f5768bf AK |
212 | unsigned bb_valid:1; /* true when BB-bit reflects |
213 | * the I2C bus state | |
214 | */ | |
079d8af2 | 215 | unsigned receiver:1; /* true when we're in receiver mode */ |
f08ac4e7 | 216 | u16 iestate; /* Saved interrupt register */ |
ef871432 RN |
217 | u16 pscstate; |
218 | u16 scllstate; | |
219 | u16 sclhstate; | |
ef871432 RN |
220 | u16 syscstate; |
221 | u16 westate; | |
f3083d92 | 222 | u16 errata; |
010d442c KS |
223 | }; |
224 | ||
a1295577 | 225 | static const u8 reg_map_ip_v1[] = { |
f38e66e0 SS |
226 | [OMAP_I2C_REV_REG] = 0x00, |
227 | [OMAP_I2C_IE_REG] = 0x01, | |
228 | [OMAP_I2C_STAT_REG] = 0x02, | |
229 | [OMAP_I2C_IV_REG] = 0x03, | |
230 | [OMAP_I2C_WE_REG] = 0x03, | |
231 | [OMAP_I2C_SYSS_REG] = 0x04, | |
232 | [OMAP_I2C_BUF_REG] = 0x05, | |
233 | [OMAP_I2C_CNT_REG] = 0x06, | |
234 | [OMAP_I2C_DATA_REG] = 0x07, | |
235 | [OMAP_I2C_SYSC_REG] = 0x08, | |
236 | [OMAP_I2C_CON_REG] = 0x09, | |
237 | [OMAP_I2C_OA_REG] = 0x0a, | |
238 | [OMAP_I2C_SA_REG] = 0x0b, | |
239 | [OMAP_I2C_PSC_REG] = 0x0c, | |
240 | [OMAP_I2C_SCLL_REG] = 0x0d, | |
241 | [OMAP_I2C_SCLH_REG] = 0x0e, | |
242 | [OMAP_I2C_SYSTEST_REG] = 0x0f, | |
243 | [OMAP_I2C_BUFSTAT_REG] = 0x10, | |
244 | }; | |
245 | ||
a1295577 | 246 | static const u8 reg_map_ip_v2[] = { |
f38e66e0 SS |
247 | [OMAP_I2C_REV_REG] = 0x04, |
248 | [OMAP_I2C_IE_REG] = 0x2c, | |
249 | [OMAP_I2C_STAT_REG] = 0x28, | |
250 | [OMAP_I2C_IV_REG] = 0x34, | |
251 | [OMAP_I2C_WE_REG] = 0x34, | |
252 | [OMAP_I2C_SYSS_REG] = 0x90, | |
253 | [OMAP_I2C_BUF_REG] = 0x94, | |
254 | [OMAP_I2C_CNT_REG] = 0x98, | |
255 | [OMAP_I2C_DATA_REG] = 0x9c, | |
2727b175 | 256 | [OMAP_I2C_SYSC_REG] = 0x10, |
f38e66e0 SS |
257 | [OMAP_I2C_CON_REG] = 0xa4, |
258 | [OMAP_I2C_OA_REG] = 0xa8, | |
259 | [OMAP_I2C_SA_REG] = 0xac, | |
260 | [OMAP_I2C_PSC_REG] = 0xb0, | |
261 | [OMAP_I2C_SCLL_REG] = 0xb4, | |
262 | [OMAP_I2C_SCLH_REG] = 0xb8, | |
263 | [OMAP_I2C_SYSTEST_REG] = 0xbC, | |
264 | [OMAP_I2C_BUFSTAT_REG] = 0xc0, | |
b8853088 AG |
265 | [OMAP_I2C_IP_V2_REVNB_LO] = 0x00, |
266 | [OMAP_I2C_IP_V2_REVNB_HI] = 0x04, | |
267 | [OMAP_I2C_IP_V2_IRQSTATUS_RAW] = 0x24, | |
268 | [OMAP_I2C_IP_V2_IRQENABLE_SET] = 0x2c, | |
269 | [OMAP_I2C_IP_V2_IRQENABLE_CLR] = 0x30, | |
f38e66e0 SS |
270 | }; |
271 | ||
010d442c KS |
272 | static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev, |
273 | int reg, u16 val) | |
274 | { | |
40b13ca8 | 275 | writew_relaxed(val, i2c_dev->base + |
f38e66e0 | 276 | (i2c_dev->regs[reg] << i2c_dev->reg_shift)); |
010d442c KS |
277 | } |
278 | ||
279 | static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg) | |
280 | { | |
40b13ca8 | 281 | return readw_relaxed(i2c_dev->base + |
f38e66e0 | 282 | (i2c_dev->regs[reg] << i2c_dev->reg_shift)); |
010d442c KS |
283 | } |
284 | ||
95dd3032 S |
285 | static void __omap_i2c_init(struct omap_i2c_dev *dev) |
286 | { | |
287 | ||
288 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); | |
289 | ||
290 | /* Setup clock prescaler to obtain approx 12MHz I2C module clock: */ | |
291 | omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, dev->pscstate); | |
292 | ||
293 | /* SCL low and high time values */ | |
294 | omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, dev->scllstate); | |
295 | omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, dev->sclhstate); | |
296 | if (dev->rev >= OMAP_I2C_REV_ON_3430_3530) | |
297 | omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, dev->westate); | |
298 | ||
299 | /* Take the I2C module out of reset: */ | |
300 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); | |
301 | ||
4f734a3a AK |
302 | /* |
303 | * NOTE: right after setting CON_EN, STAT_BB could be 0 while the | |
304 | * bus is busy. It will be changed to 1 on the next IP FCLK clock. | |
305 | * udelay(1) will be enough to fix that. | |
306 | */ | |
307 | ||
95dd3032 S |
308 | /* |
309 | * Don't write to this register if the IE state is 0 as it can | |
310 | * cause deadlock. | |
311 | */ | |
312 | if (dev->iestate) | |
313 | omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate); | |
314 | } | |
315 | ||
d6c842ad | 316 | static int omap_i2c_reset(struct omap_i2c_dev *dev) |
010d442c | 317 | { |
010d442c | 318 | unsigned long timeout; |
ca85e248 S |
319 | u16 sysc; |
320 | ||
4e80f727 | 321 | if (dev->rev >= OMAP_I2C_OMAP1_REV_2) { |
ca85e248 S |
322 | sysc = omap_i2c_read_reg(dev, OMAP_I2C_SYSC_REG); |
323 | ||
57eb81b1 MG |
324 | /* Disable I2C controller before soft reset */ |
325 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, | |
326 | omap_i2c_read_reg(dev, OMAP_I2C_CON_REG) & | |
327 | ~(OMAP_I2C_CON_EN)); | |
328 | ||
fdd07fe6 | 329 | omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK); |
010d442c KS |
330 | /* For some reason we need to set the EN bit before the |
331 | * reset done bit gets set. */ | |
332 | timeout = jiffies + OMAP_I2C_TIMEOUT; | |
333 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); | |
334 | while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) & | |
fdd07fe6 | 335 | SYSS_RESETDONE_MASK)) { |
010d442c | 336 | if (time_after(jiffies, timeout)) { |
fce3ff03 | 337 | dev_warn(dev->dev, "timeout waiting " |
010d442c KS |
338 | "for controller reset\n"); |
339 | return -ETIMEDOUT; | |
340 | } | |
341 | msleep(1); | |
342 | } | |
fdd07fe6 PW |
343 | |
344 | /* SYSC register is cleared by the reset; rewrite it */ | |
ca85e248 | 345 | omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, sysc); |
fdd07fe6 | 346 | |
23173eae AK |
347 | if (dev->rev > OMAP_I2C_REV_ON_3430_3530) { |
348 | /* Schedule I2C-bus monitoring on the next transfer */ | |
349 | dev->bb_valid = 0; | |
350 | } | |
010d442c | 351 | } |
0f5768bf | 352 | |
d6c842ad S |
353 | return 0; |
354 | } | |
355 | ||
356 | static int omap_i2c_init(struct omap_i2c_dev *dev) | |
357 | { | |
358 | u16 psc = 0, scll = 0, sclh = 0; | |
359 | u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0; | |
360 | unsigned long fclk_rate = 12000000; | |
361 | unsigned long internal_clk = 0; | |
362 | struct clk *fclk; | |
363 | ||
364 | if (dev->rev >= OMAP_I2C_REV_ON_3430_3530) { | |
365 | /* | |
366 | * Enabling all wakup sources to stop I2C freezing on | |
367 | * WFI instruction. | |
368 | * REVISIT: Some wkup sources might not be needed. | |
369 | */ | |
370 | dev->westate = OMAP_I2C_WE_ALL; | |
371 | } | |
010d442c | 372 | |
6145197b | 373 | if (dev->flags & OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK) { |
0e9ae109 RK |
374 | /* |
375 | * The I2C functional clock is the armxor_ck, so there's | |
376 | * no need to get "armxor_ck" separately. Now, if OMAP2420 | |
377 | * always returns 12MHz for the functional clock, we can | |
378 | * do this bit unconditionally. | |
379 | */ | |
27b1fec2 RN |
380 | fclk = clk_get(dev->dev, "fck"); |
381 | fclk_rate = clk_get_rate(fclk); | |
382 | clk_put(fclk); | |
0e9ae109 | 383 | |
010d442c KS |
384 | /* TRM for 5912 says the I2C clock must be prescaled to be |
385 | * between 7 - 12 MHz. The XOR input clock is typically | |
386 | * 12, 13 or 19.2 MHz. So we should have code that produces: | |
387 | * | |
388 | * XOR MHz Divider Prescaler | |
389 | * 12 1 0 | |
390 | * 13 2 1 | |
391 | * 19.2 2 1 | |
392 | */ | |
d7aef138 JD |
393 | if (fclk_rate > 12000000) |
394 | psc = fclk_rate / 12000000; | |
010d442c KS |
395 | } |
396 | ||
6145197b | 397 | if (!(dev->flags & OMAP_I2C_FLAG_SIMPLE_CLOCK)) { |
4574eb68 | 398 | |
84bf2c86 AK |
399 | /* |
400 | * HSI2C controller internal clk rate should be 19.2 Mhz for | |
401 | * HS and for all modes on 2430. On 34xx we can use lower rate | |
402 | * to get longer filter period for better noise suppression. | |
403 | * The filter is iclk (fclk for HS) period. | |
404 | */ | |
3be0053e | 405 | if (dev->speed > 400 || |
6145197b | 406 | dev->flags & OMAP_I2C_FLAG_FORCE_19200_INT_CLK) |
84bf2c86 AK |
407 | internal_clk = 19200; |
408 | else if (dev->speed > 100) | |
409 | internal_clk = 9600; | |
410 | else | |
411 | internal_clk = 4000; | |
27b1fec2 RN |
412 | fclk = clk_get(dev->dev, "fck"); |
413 | fclk_rate = clk_get_rate(fclk) / 1000; | |
414 | clk_put(fclk); | |
4574eb68 SMK |
415 | |
416 | /* Compute prescaler divisor */ | |
417 | psc = fclk_rate / internal_clk; | |
418 | psc = psc - 1; | |
419 | ||
420 | /* If configured for High Speed */ | |
421 | if (dev->speed > 400) { | |
baf46b4e AK |
422 | unsigned long scl; |
423 | ||
4574eb68 | 424 | /* For first phase of HS mode */ |
baf46b4e AK |
425 | scl = internal_clk / 400; |
426 | fsscll = scl - (scl / 3) - 7; | |
427 | fssclh = (scl / 3) - 5; | |
4574eb68 SMK |
428 | |
429 | /* For second phase of HS mode */ | |
baf46b4e AK |
430 | scl = fclk_rate / dev->speed; |
431 | hsscll = scl - (scl / 3) - 7; | |
432 | hssclh = (scl / 3) - 5; | |
433 | } else if (dev->speed > 100) { | |
434 | unsigned long scl; | |
435 | ||
436 | /* Fast mode */ | |
437 | scl = internal_clk / dev->speed; | |
438 | fsscll = scl - (scl / 3) - 7; | |
439 | fssclh = (scl / 3) - 5; | |
4574eb68 | 440 | } else { |
baf46b4e AK |
441 | /* Standard mode */ |
442 | fsscll = internal_clk / (dev->speed * 2) - 7; | |
443 | fssclh = internal_clk / (dev->speed * 2) - 5; | |
4574eb68 SMK |
444 | } |
445 | scll = (hsscll << OMAP_I2C_SCLL_HSSCLL) | fsscll; | |
446 | sclh = (hssclh << OMAP_I2C_SCLH_HSSCLH) | fssclh; | |
447 | } else { | |
448 | /* Program desired operating rate */ | |
449 | fclk_rate /= (psc + 1) * 1000; | |
450 | if (psc > 2) | |
451 | psc = 2; | |
452 | scll = fclk_rate / (dev->speed * 2) - 7 + psc; | |
453 | sclh = fclk_rate / (dev->speed * 2) - 7 + psc; | |
454 | } | |
455 | ||
ef871432 | 456 | dev->iestate = (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY | |
c1a473bd TL |
457 | OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK | |
458 | OMAP_I2C_IE_AL) | ((dev->fifo_size) ? | |
ef871432 | 459 | (OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0); |
95dd3032 S |
460 | |
461 | dev->pscstate = psc; | |
462 | dev->scllstate = scll; | |
463 | dev->sclhstate = sclh; | |
464 | ||
23173eae | 465 | if (dev->rev <= OMAP_I2C_REV_ON_3430_3530) { |
0f5768bf AK |
466 | /* Not implemented */ |
467 | dev->bb_valid = 1; | |
468 | } | |
469 | ||
95dd3032 S |
470 | __omap_i2c_init(dev); |
471 | ||
010d442c KS |
472 | return 0; |
473 | } | |
474 | ||
475 | /* | |
476 | * Waiting on Bus Busy | |
477 | */ | |
478 | static int omap_i2c_wait_for_bb(struct omap_i2c_dev *dev) | |
479 | { | |
480 | unsigned long timeout; | |
481 | ||
482 | timeout = jiffies + OMAP_I2C_TIMEOUT; | |
483 | while (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) & OMAP_I2C_STAT_BB) { | |
484 | if (time_after(jiffies, timeout)) { | |
485 | dev_warn(dev->dev, "timeout waiting for bus ready\n"); | |
486 | return -ETIMEDOUT; | |
487 | } | |
488 | msleep(1); | |
489 | } | |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
0f5768bf AK |
494 | /* |
495 | * Wait while BB-bit doesn't reflect the I2C bus state | |
496 | * | |
497 | * In a multimaster environment, after IP software reset, BB-bit value doesn't | |
498 | * correspond to the current bus state. It may happen what BB-bit will be 0, | |
499 | * while the bus is busy due to another I2C master activity. | |
500 | * Here are BB-bit values after reset: | |
501 | * SDA SCL BB NOTES | |
502 | * 0 0 0 1, 2 | |
503 | * 1 0 0 1, 2 | |
504 | * 0 1 1 | |
505 | * 1 1 0 3 | |
506 | * Later, if IP detect SDA=0 and SCL=1 (ACK) or SDA 1->0 while SCL=1 (START) | |
507 | * combinations on the bus, it set BB-bit to 1. | |
508 | * If IP detect SDA 0->1 while SCL=1 (STOP) combination on the bus, | |
509 | * it set BB-bit to 0 and BF to 1. | |
510 | * BB and BF bits correctly tracks the bus state while IP is suspended | |
511 | * BB bit became valid on the next FCLK clock after CON_EN bit set | |
512 | * | |
513 | * NOTES: | |
514 | * 1. Any transfer started when BB=0 and bus is busy wouldn't be | |
515 | * completed by IP and results in controller timeout. | |
516 | * 2. Any transfer started when BB=0 and SCL=0 results in IP | |
517 | * starting to drive SDA low. In that case IP corrupt data | |
518 | * on the bus. | |
519 | * 3. Any transfer started in the middle of another master's transfer | |
520 | * results in unpredictable results and data corruption | |
521 | */ | |
522 | static int omap_i2c_wait_for_bb_valid(struct omap_i2c_dev *dev) | |
523 | { | |
524 | unsigned long bus_free_timeout = 0; | |
525 | unsigned long timeout; | |
526 | int bus_free = 0; | |
527 | u16 stat, systest; | |
528 | ||
529 | if (dev->bb_valid) | |
530 | return 0; | |
531 | ||
532 | timeout = jiffies + OMAP_I2C_TIMEOUT; | |
533 | while (1) { | |
534 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); | |
535 | /* | |
536 | * We will see BB or BF event in a case IP had detected any | |
537 | * activity on the I2C bus. Now IP correctly tracks the bus | |
538 | * state. BB-bit value is valid. | |
539 | */ | |
540 | if (stat & (OMAP_I2C_STAT_BB | OMAP_I2C_STAT_BF)) | |
541 | break; | |
542 | ||
543 | /* | |
544 | * Otherwise, we must look signals on the bus to make | |
545 | * the right decision. | |
546 | */ | |
547 | systest = omap_i2c_read_reg(dev, OMAP_I2C_SYSTEST_REG); | |
548 | if ((systest & OMAP_I2C_SYSTEST_SCL_I_FUNC) && | |
549 | (systest & OMAP_I2C_SYSTEST_SDA_I_FUNC)) { | |
550 | if (!bus_free) { | |
551 | bus_free_timeout = jiffies + | |
552 | OMAP_I2C_BUS_FREE_TIMEOUT; | |
553 | bus_free = 1; | |
554 | } | |
555 | ||
556 | /* | |
557 | * SDA and SCL lines was high for 10 ms without bus | |
558 | * activity detected. The bus is free. Consider | |
559 | * BB-bit value is valid. | |
560 | */ | |
561 | if (time_after(jiffies, bus_free_timeout)) | |
562 | break; | |
563 | } else { | |
564 | bus_free = 0; | |
565 | } | |
566 | ||
567 | if (time_after(jiffies, timeout)) { | |
568 | dev_warn(dev->dev, "timeout waiting for bus ready\n"); | |
569 | return -ETIMEDOUT; | |
570 | } | |
571 | ||
572 | msleep(1); | |
573 | } | |
574 | ||
575 | dev->bb_valid = 1; | |
576 | return 0; | |
577 | } | |
578 | ||
dd74548d FB |
579 | static void omap_i2c_resize_fifo(struct omap_i2c_dev *dev, u8 size, bool is_rx) |
580 | { | |
581 | u16 buf; | |
582 | ||
583 | if (dev->flags & OMAP_I2C_FLAG_NO_FIFO) | |
584 | return; | |
585 | ||
586 | /* | |
587 | * Set up notification threshold based on message size. We're doing | |
588 | * this to try and avoid draining feature as much as possible. Whenever | |
589 | * we have big messages to transfer (bigger than our total fifo size) | |
590 | * then we might use draining feature to transfer the remaining bytes. | |
591 | */ | |
592 | ||
593 | dev->threshold = clamp(size, (u8) 1, dev->fifo_size); | |
594 | ||
595 | buf = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG); | |
596 | ||
597 | if (is_rx) { | |
598 | /* Clear RX Threshold */ | |
599 | buf &= ~(0x3f << 8); | |
600 | buf |= ((dev->threshold - 1) << 8) | OMAP_I2C_BUF_RXFIF_CLR; | |
601 | } else { | |
602 | /* Clear TX Threshold */ | |
603 | buf &= ~0x3f; | |
604 | buf |= (dev->threshold - 1) | OMAP_I2C_BUF_TXFIF_CLR; | |
605 | } | |
606 | ||
607 | omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, buf); | |
608 | ||
47dcd016 | 609 | if (dev->rev < OMAP_I2C_REV_ON_3630) |
dd74548d FB |
610 | dev->b_hw = 1; /* Enable hardware fixes */ |
611 | ||
612 | /* calculate wakeup latency constraint for MPU */ | |
49839dc9 PW |
613 | if (dev->set_mpu_wkup_lat != NULL) |
614 | dev->latency = (1000000 * dev->threshold) / | |
615 | (1000 * dev->speed / 8); | |
dd74548d FB |
616 | } |
617 | ||
010d442c KS |
618 | /* |
619 | * Low level master read/write transaction. | |
620 | */ | |
621 | static int omap_i2c_xfer_msg(struct i2c_adapter *adap, | |
622 | struct i2c_msg *msg, int stop) | |
623 | { | |
624 | struct omap_i2c_dev *dev = i2c_get_adapdata(adap); | |
33d54985 | 625 | unsigned long timeout; |
010d442c KS |
626 | u16 w; |
627 | ||
628 | dev_dbg(dev->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n", | |
629 | msg->addr, msg->len, msg->flags, stop); | |
630 | ||
631 | if (msg->len == 0) | |
632 | return -EINVAL; | |
633 | ||
dd74548d FB |
634 | dev->receiver = !!(msg->flags & I2C_M_RD); |
635 | omap_i2c_resize_fifo(dev, msg->len, dev->receiver); | |
636 | ||
010d442c KS |
637 | omap_i2c_write_reg(dev, OMAP_I2C_SA_REG, msg->addr); |
638 | ||
639 | /* REVISIT: Could the STB bit of I2C_CON be used with probing? */ | |
640 | dev->buf = msg->buf; | |
641 | dev->buf_len = msg->len; | |
642 | ||
d60ece5f FB |
643 | /* make sure writes to dev->buf_len are ordered */ |
644 | barrier(); | |
645 | ||
010d442c KS |
646 | omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len); |
647 | ||
b6ee52c3 NM |
648 | /* Clear the FIFO Buffers */ |
649 | w = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG); | |
650 | w |= OMAP_I2C_BUF_RXFIF_CLR | OMAP_I2C_BUF_TXFIF_CLR; | |
651 | omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, w); | |
652 | ||
16735d02 | 653 | reinit_completion(&dev->cmd_complete); |
010d442c KS |
654 | dev->cmd_err = 0; |
655 | ||
656 | w = OMAP_I2C_CON_EN | OMAP_I2C_CON_MST | OMAP_I2C_CON_STT; | |
4574eb68 SMK |
657 | |
658 | /* High speed configuration */ | |
659 | if (dev->speed > 400) | |
b6ee52c3 | 660 | w |= OMAP_I2C_CON_OPMODE_HS; |
4574eb68 | 661 | |
fb604a3d LP |
662 | if (msg->flags & I2C_M_STOP) |
663 | stop = 1; | |
010d442c KS |
664 | if (msg->flags & I2C_M_TEN) |
665 | w |= OMAP_I2C_CON_XA; | |
666 | if (!(msg->flags & I2C_M_RD)) | |
667 | w |= OMAP_I2C_CON_TRX; | |
c1a473bd | 668 | |
b6ee52c3 | 669 | if (!dev->b_hw && stop) |
010d442c | 670 | w |= OMAP_I2C_CON_STP; |
4f734a3a AK |
671 | /* |
672 | * NOTE: STAT_BB bit could became 1 here if another master occupy | |
673 | * the bus. IP successfully complete transfer when the bus will be | |
674 | * free again (BB reset to 0). | |
675 | */ | |
010d442c KS |
676 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); |
677 | ||
b6ee52c3 NM |
678 | /* |
679 | * Don't write stt and stp together on some hardware. | |
680 | */ | |
681 | if (dev->b_hw && stop) { | |
682 | unsigned long delay = jiffies + OMAP_I2C_TIMEOUT; | |
683 | u16 con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); | |
684 | while (con & OMAP_I2C_CON_STT) { | |
685 | con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); | |
686 | ||
687 | /* Let the user know if i2c is in a bad state */ | |
688 | if (time_after(jiffies, delay)) { | |
689 | dev_err(dev->dev, "controller timed out " | |
690 | "waiting for start condition to finish\n"); | |
691 | return -ETIMEDOUT; | |
692 | } | |
693 | cpu_relax(); | |
694 | } | |
695 | ||
696 | w |= OMAP_I2C_CON_STP; | |
697 | w &= ~OMAP_I2C_CON_STT; | |
698 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); | |
699 | } | |
700 | ||
b7af349b JN |
701 | /* |
702 | * REVISIT: We should abort the transfer on signals, but the bus goes | |
703 | * into arbitration and we're currently unable to recover from it. | |
704 | */ | |
33d54985 S |
705 | timeout = wait_for_completion_timeout(&dev->cmd_complete, |
706 | OMAP_I2C_TIMEOUT); | |
33d54985 | 707 | if (timeout == 0) { |
010d442c | 708 | dev_err(dev->dev, "controller timed out\n"); |
d6c842ad S |
709 | omap_i2c_reset(dev); |
710 | __omap_i2c_init(dev); | |
010d442c KS |
711 | return -ETIMEDOUT; |
712 | } | |
713 | ||
714 | if (likely(!dev->cmd_err)) | |
715 | return 0; | |
716 | ||
717 | /* We have an error */ | |
b76911d2 | 718 | if (dev->cmd_err & (OMAP_I2C_STAT_ROVR | OMAP_I2C_STAT_XUDF)) { |
d6c842ad S |
719 | omap_i2c_reset(dev); |
720 | __omap_i2c_init(dev); | |
010d442c KS |
721 | return -EIO; |
722 | } | |
723 | ||
b76911d2 AK |
724 | if (dev->cmd_err & OMAP_I2C_STAT_AL) |
725 | return -EAGAIN; | |
726 | ||
010d442c KS |
727 | if (dev->cmd_err & OMAP_I2C_STAT_NACK) { |
728 | if (msg->flags & I2C_M_IGNORE_NAK) | |
729 | return 0; | |
cda2109a GS |
730 | |
731 | w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); | |
732 | w |= OMAP_I2C_CON_STP; | |
733 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); | |
010d442c KS |
734 | return -EREMOTEIO; |
735 | } | |
736 | return -EIO; | |
737 | } | |
738 | ||
739 | ||
740 | /* | |
741 | * Prepare controller for a transaction and call omap_i2c_xfer_msg | |
742 | * to do the work during IRQ processing. | |
743 | */ | |
744 | static int | |
745 | omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) | |
746 | { | |
747 | struct omap_i2c_dev *dev = i2c_get_adapdata(adap); | |
748 | int i; | |
749 | int r; | |
750 | ||
3b0fb97c | 751 | r = pm_runtime_get_sync(dev->dev); |
ff370257 | 752 | if (r < 0) |
33ec5e81 | 753 | goto out; |
010d442c | 754 | |
0f5768bf AK |
755 | r = omap_i2c_wait_for_bb_valid(dev); |
756 | if (r < 0) | |
757 | goto out; | |
758 | ||
c1a473bd TL |
759 | r = omap_i2c_wait_for_bb(dev); |
760 | if (r < 0) | |
010d442c KS |
761 | goto out; |
762 | ||
49839dc9 PW |
763 | if (dev->set_mpu_wkup_lat != NULL) |
764 | dev->set_mpu_wkup_lat(dev->dev, dev->latency); | |
6a91b558 | 765 | |
010d442c KS |
766 | for (i = 0; i < num; i++) { |
767 | r = omap_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1))); | |
768 | if (r != 0) | |
769 | break; | |
770 | } | |
771 | ||
772 | if (r == 0) | |
773 | r = num; | |
5c64eb26 MN |
774 | |
775 | omap_i2c_wait_for_bb(dev); | |
1ab36045 S |
776 | |
777 | if (dev->set_mpu_wkup_lat != NULL) | |
778 | dev->set_mpu_wkup_lat(dev->dev, -1); | |
779 | ||
010d442c | 780 | out: |
6d8451d5 FB |
781 | pm_runtime_mark_last_busy(dev->dev); |
782 | pm_runtime_put_autosuspend(dev->dev); | |
010d442c KS |
783 | return r; |
784 | } | |
785 | ||
786 | static u32 | |
787 | omap_i2c_func(struct i2c_adapter *adap) | |
788 | { | |
fb604a3d LP |
789 | return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) | |
790 | I2C_FUNC_PROTOCOL_MANGLING; | |
010d442c KS |
791 | } |
792 | ||
793 | static inline void | |
794 | omap_i2c_complete_cmd(struct omap_i2c_dev *dev, u16 err) | |
795 | { | |
796 | dev->cmd_err |= err; | |
797 | complete(&dev->cmd_complete); | |
798 | } | |
799 | ||
800 | static inline void | |
801 | omap_i2c_ack_stat(struct omap_i2c_dev *dev, u16 stat) | |
802 | { | |
803 | omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat); | |
804 | } | |
805 | ||
f3083d92 | 806 | static inline void i2c_omap_errata_i207(struct omap_i2c_dev *dev, u16 stat) |
807 | { | |
808 | /* | |
809 | * I2C Errata(Errata Nos. OMAP2: 1.67, OMAP3: 1.8) | |
810 | * Not applicable for OMAP4. | |
811 | * Under certain rare conditions, RDR could be set again | |
812 | * when the bus is busy, then ignore the interrupt and | |
813 | * clear the interrupt. | |
814 | */ | |
815 | if (stat & OMAP_I2C_STAT_RDR) { | |
816 | /* Step 1: If RDR is set, clear it */ | |
817 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR); | |
818 | ||
819 | /* Step 2: */ | |
820 | if (!(omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) | |
821 | & OMAP_I2C_STAT_BB)) { | |
822 | ||
823 | /* Step 3: */ | |
824 | if (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) | |
825 | & OMAP_I2C_STAT_RDR) { | |
826 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR); | |
827 | dev_dbg(dev->dev, "RDR when bus is busy.\n"); | |
828 | } | |
829 | ||
830 | } | |
831 | } | |
832 | } | |
833 | ||
43469d8e PW |
834 | /* rev1 devices are apparently only on some 15xx */ |
835 | #ifdef CONFIG_ARCH_OMAP15XX | |
836 | ||
010d442c | 837 | static irqreturn_t |
4e80f727 | 838 | omap_i2c_omap1_isr(int this_irq, void *dev_id) |
010d442c KS |
839 | { |
840 | struct omap_i2c_dev *dev = dev_id; | |
841 | u16 iv, w; | |
842 | ||
fab67afb | 843 | if (pm_runtime_suspended(dev->dev)) |
f08ac4e7 TL |
844 | return IRQ_NONE; |
845 | ||
010d442c KS |
846 | iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); |
847 | switch (iv) { | |
848 | case 0x00: /* None */ | |
849 | break; | |
850 | case 0x01: /* Arbitration lost */ | |
851 | dev_err(dev->dev, "Arbitration lost\n"); | |
852 | omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL); | |
853 | break; | |
854 | case 0x02: /* No acknowledgement */ | |
855 | omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK); | |
856 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_STP); | |
857 | break; | |
858 | case 0x03: /* Register access ready */ | |
859 | omap_i2c_complete_cmd(dev, 0); | |
860 | break; | |
861 | case 0x04: /* Receive data ready */ | |
862 | if (dev->buf_len) { | |
863 | w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); | |
864 | *dev->buf++ = w; | |
865 | dev->buf_len--; | |
866 | if (dev->buf_len) { | |
867 | *dev->buf++ = w >> 8; | |
868 | dev->buf_len--; | |
869 | } | |
870 | } else | |
871 | dev_err(dev->dev, "RRDY IRQ while no data requested\n"); | |
872 | break; | |
873 | case 0x05: /* Transmit data ready */ | |
874 | if (dev->buf_len) { | |
875 | w = *dev->buf++; | |
876 | dev->buf_len--; | |
877 | if (dev->buf_len) { | |
878 | w |= *dev->buf++ << 8; | |
879 | dev->buf_len--; | |
880 | } | |
881 | omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); | |
882 | } else | |
883 | dev_err(dev->dev, "XRDY IRQ while no data to send\n"); | |
884 | break; | |
885 | default: | |
886 | return IRQ_NONE; | |
887 | } | |
888 | ||
889 | return IRQ_HANDLED; | |
890 | } | |
43469d8e | 891 | #else |
4e80f727 | 892 | #define omap_i2c_omap1_isr NULL |
43469d8e | 893 | #endif |
010d442c | 894 | |
2dd151ab | 895 | /* |
c8db38f0 | 896 | * OMAP3430 Errata i462: When an XRDY/XDR is hit, wait for XUDF before writing |
2dd151ab AS |
897 | * data to DATA_REG. Otherwise some data bytes can be lost while transferring |
898 | * them from the memory to the I2C interface. | |
899 | */ | |
4151e741 | 900 | static int errata_omap3_i462(struct omap_i2c_dev *dev) |
2dd151ab | 901 | { |
e9f59b9c | 902 | unsigned long timeout = 10000; |
4151e741 | 903 | u16 stat; |
e9f59b9c | 904 | |
4151e741 FB |
905 | do { |
906 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); | |
907 | if (stat & OMAP_I2C_STAT_XUDF) | |
908 | break; | |
909 | ||
910 | if (stat & (OMAP_I2C_STAT_NACK | OMAP_I2C_STAT_AL)) { | |
540a4790 | 911 | omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_XRDY | |
2dd151ab | 912 | OMAP_I2C_STAT_XDR)); |
b07be0f3 FB |
913 | if (stat & OMAP_I2C_STAT_NACK) { |
914 | dev->cmd_err |= OMAP_I2C_STAT_NACK; | |
915 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK); | |
916 | } | |
917 | ||
918 | if (stat & OMAP_I2C_STAT_AL) { | |
919 | dev_err(dev->dev, "Arbitration lost\n"); | |
920 | dev->cmd_err |= OMAP_I2C_STAT_AL; | |
2c5de558 | 921 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_AL); |
b07be0f3 FB |
922 | } |
923 | ||
4151e741 | 924 | return -EIO; |
2dd151ab | 925 | } |
e9f59b9c | 926 | |
2dd151ab | 927 | cpu_relax(); |
4151e741 | 928 | } while (--timeout); |
2dd151ab | 929 | |
e9f59b9c AS |
930 | if (!timeout) { |
931 | dev_err(dev->dev, "timeout waiting on XUDF bit\n"); | |
932 | return 0; | |
933 | } | |
934 | ||
2dd151ab AS |
935 | return 0; |
936 | } | |
937 | ||
3312d25e FB |
938 | static void omap_i2c_receive_data(struct omap_i2c_dev *dev, u8 num_bytes, |
939 | bool is_rdr) | |
940 | { | |
941 | u16 w; | |
942 | ||
943 | while (num_bytes--) { | |
3312d25e FB |
944 | w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); |
945 | *dev->buf++ = w; | |
946 | dev->buf_len--; | |
947 | ||
948 | /* | |
949 | * Data reg in 2430, omap3 and | |
950 | * omap4 is 8 bit wide | |
951 | */ | |
952 | if (dev->flags & OMAP_I2C_FLAG_16BIT_DATA_REG) { | |
dd74548d FB |
953 | *dev->buf++ = w >> 8; |
954 | dev->buf_len--; | |
3312d25e FB |
955 | } |
956 | } | |
957 | } | |
958 | ||
959 | static int omap_i2c_transmit_data(struct omap_i2c_dev *dev, u8 num_bytes, | |
960 | bool is_xdr) | |
961 | { | |
962 | u16 w; | |
963 | ||
964 | while (num_bytes--) { | |
3312d25e FB |
965 | w = *dev->buf++; |
966 | dev->buf_len--; | |
967 | ||
968 | /* | |
969 | * Data reg in 2430, omap3 and | |
970 | * omap4 is 8 bit wide | |
971 | */ | |
972 | if (dev->flags & OMAP_I2C_FLAG_16BIT_DATA_REG) { | |
dd74548d FB |
973 | w |= *dev->buf++ << 8; |
974 | dev->buf_len--; | |
3312d25e FB |
975 | } |
976 | ||
977 | if (dev->errata & I2C_OMAP_ERRATA_I462) { | |
978 | int ret; | |
979 | ||
980 | ret = errata_omap3_i462(dev); | |
981 | if (ret < 0) | |
982 | return ret; | |
983 | } | |
984 | ||
985 | omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); | |
986 | } | |
987 | ||
988 | return 0; | |
989 | } | |
990 | ||
010d442c | 991 | static irqreturn_t |
3b2f8f82 | 992 | omap_i2c_isr(int irq, void *dev_id) |
010d442c KS |
993 | { |
994 | struct omap_i2c_dev *dev = dev_id; | |
3b2f8f82 FB |
995 | irqreturn_t ret = IRQ_HANDLED; |
996 | u16 mask; | |
997 | u16 stat; | |
998 | ||
999 | spin_lock(&dev->lock); | |
1000 | mask = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); | |
1001 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); | |
1002 | ||
1003 | if (stat & mask) | |
1004 | ret = IRQ_WAKE_THREAD; | |
1005 | ||
1006 | spin_unlock(&dev->lock); | |
1007 | ||
1008 | return ret; | |
1009 | } | |
1010 | ||
010d442c | 1011 | static irqreturn_t |
3b2f8f82 | 1012 | omap_i2c_isr_thread(int this_irq, void *dev_id) |
010d442c KS |
1013 | { |
1014 | struct omap_i2c_dev *dev = dev_id; | |
3b2f8f82 | 1015 | unsigned long flags; |
010d442c | 1016 | u16 bits; |
3312d25e | 1017 | u16 stat; |
66b92988 | 1018 | int err = 0, count = 0; |
010d442c | 1019 | |
3b2f8f82 | 1020 | spin_lock_irqsave(&dev->lock, flags); |
66b92988 FB |
1021 | do { |
1022 | bits = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); | |
1023 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); | |
1024 | stat &= bits; | |
1025 | ||
079d8af2 FB |
1026 | /* If we're in receiver mode, ignore XDR/XRDY */ |
1027 | if (dev->receiver) | |
1028 | stat &= ~(OMAP_I2C_STAT_XDR | OMAP_I2C_STAT_XRDY); | |
1029 | else | |
1030 | stat &= ~(OMAP_I2C_STAT_RDR | OMAP_I2C_STAT_RRDY); | |
010d442c | 1031 | |
66b92988 FB |
1032 | if (!stat) { |
1033 | /* my work here is done */ | |
0bdfe0cb | 1034 | goto out; |
66b92988 | 1035 | } |
f08ac4e7 | 1036 | |
010d442c KS |
1037 | dev_dbg(dev->dev, "IRQ (ISR = 0x%04x)\n", stat); |
1038 | if (count++ == 100) { | |
1039 | dev_warn(dev->dev, "Too much work in one IRQ\n"); | |
1040 | break; | |
1041 | } | |
1042 | ||
1d7afc95 | 1043 | if (stat & OMAP_I2C_STAT_NACK) { |
b6ee52c3 | 1044 | err |= OMAP_I2C_STAT_NACK; |
1d7afc95 | 1045 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK); |
1d7afc95 | 1046 | } |
78e1cf42 | 1047 | |
b6ee52c3 NM |
1048 | if (stat & OMAP_I2C_STAT_AL) { |
1049 | dev_err(dev->dev, "Arbitration lost\n"); | |
1050 | err |= OMAP_I2C_STAT_AL; | |
1d7afc95 | 1051 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_AL); |
b6ee52c3 | 1052 | } |
c55edb99 | 1053 | |
a5a595cc | 1054 | /* |
cb527ede | 1055 | * ProDB0017052: Clear ARDY bit twice |
a5a595cc | 1056 | */ |
4cdbf7d3 TK |
1057 | if (stat & OMAP_I2C_STAT_ARDY) |
1058 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_ARDY); | |
1059 | ||
b6ee52c3 | 1060 | if (stat & (OMAP_I2C_STAT_ARDY | OMAP_I2C_STAT_NACK | |
04c688dd | 1061 | OMAP_I2C_STAT_AL)) { |
540a4790 FB |
1062 | omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_RRDY | |
1063 | OMAP_I2C_STAT_RDR | | |
1064 | OMAP_I2C_STAT_XRDY | | |
1065 | OMAP_I2C_STAT_XDR | | |
1066 | OMAP_I2C_STAT_ARDY)); | |
0bdfe0cb | 1067 | break; |
04c688dd | 1068 | } |
c55edb99 | 1069 | |
6d9939f6 | 1070 | if (stat & OMAP_I2C_STAT_RDR) { |
b6ee52c3 | 1071 | u8 num_bytes = 1; |
f3083d92 | 1072 | |
6d9939f6 FB |
1073 | if (dev->fifo_size) |
1074 | num_bytes = dev->buf_len; | |
1075 | ||
ccfc8663 | 1076 | if (dev->errata & I2C_OMAP_ERRATA_I207) { |
f3083d92 | 1077 | i2c_omap_errata_i207(dev, stat); |
ccfc8663 AK |
1078 | num_bytes = (omap_i2c_read_reg(dev, |
1079 | OMAP_I2C_BUFSTAT_REG) >> 8) & 0x3F; | |
1080 | } | |
f3083d92 | 1081 | |
ccfc8663 | 1082 | omap_i2c_receive_data(dev, num_bytes, true); |
6d9939f6 | 1083 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR); |
9eb13cf3 | 1084 | continue; |
6d9939f6 FB |
1085 | } |
1086 | ||
1087 | if (stat & OMAP_I2C_STAT_RRDY) { | |
1088 | u8 num_bytes = 1; | |
1089 | ||
dd74548d FB |
1090 | if (dev->threshold) |
1091 | num_bytes = dev->threshold; | |
6d9939f6 | 1092 | |
3312d25e | 1093 | omap_i2c_receive_data(dev, num_bytes, false); |
6d9939f6 | 1094 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RRDY); |
010d442c KS |
1095 | continue; |
1096 | } | |
c55edb99 | 1097 | |
6d9939f6 | 1098 | if (stat & OMAP_I2C_STAT_XDR) { |
b6ee52c3 | 1099 | u8 num_bytes = 1; |
3312d25e | 1100 | int ret; |
6d9939f6 FB |
1101 | |
1102 | if (dev->fifo_size) | |
1103 | num_bytes = dev->buf_len; | |
1104 | ||
3312d25e | 1105 | ret = omap_i2c_transmit_data(dev, num_bytes, true); |
3312d25e | 1106 | if (ret < 0) |
0bdfe0cb | 1107 | break; |
6d9939f6 FB |
1108 | |
1109 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XDR); | |
9eb13cf3 | 1110 | continue; |
6d9939f6 FB |
1111 | } |
1112 | ||
1113 | if (stat & OMAP_I2C_STAT_XRDY) { | |
1114 | u8 num_bytes = 1; | |
3312d25e | 1115 | int ret; |
6d9939f6 | 1116 | |
dd74548d FB |
1117 | if (dev->threshold) |
1118 | num_bytes = dev->threshold; | |
6d9939f6 | 1119 | |
3312d25e | 1120 | ret = omap_i2c_transmit_data(dev, num_bytes, false); |
3312d25e | 1121 | if (ret < 0) |
0bdfe0cb | 1122 | break; |
6d9939f6 FB |
1123 | |
1124 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XRDY); | |
010d442c KS |
1125 | continue; |
1126 | } | |
c55edb99 | 1127 | |
010d442c KS |
1128 | if (stat & OMAP_I2C_STAT_ROVR) { |
1129 | dev_err(dev->dev, "Receive overrun\n"); | |
1d7afc95 FB |
1130 | err |= OMAP_I2C_STAT_ROVR; |
1131 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_ROVR); | |
0bdfe0cb | 1132 | break; |
010d442c | 1133 | } |
c55edb99 | 1134 | |
010d442c | 1135 | if (stat & OMAP_I2C_STAT_XUDF) { |
b6ee52c3 | 1136 | dev_err(dev->dev, "Transmit underflow\n"); |
1d7afc95 FB |
1137 | err |= OMAP_I2C_STAT_XUDF; |
1138 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XUDF); | |
0bdfe0cb | 1139 | break; |
010d442c | 1140 | } |
66b92988 | 1141 | } while (stat); |
010d442c | 1142 | |
4a7ec4ed | 1143 | omap_i2c_complete_cmd(dev, err); |
0bdfe0cb FB |
1144 | |
1145 | out: | |
3b2f8f82 | 1146 | spin_unlock_irqrestore(&dev->lock, flags); |
010d442c | 1147 | |
6a85ced2 | 1148 | return IRQ_HANDLED; |
010d442c KS |
1149 | } |
1150 | ||
8f9082c5 | 1151 | static const struct i2c_algorithm omap_i2c_algo = { |
010d442c KS |
1152 | .master_xfer = omap_i2c_xfer, |
1153 | .functionality = omap_i2c_func, | |
1154 | }; | |
1155 | ||
6145197b | 1156 | #ifdef CONFIG_OF |
4c624840 TL |
1157 | static struct omap_i2c_bus_platform_data omap2420_pdata = { |
1158 | .rev = OMAP_I2C_IP_VERSION_1, | |
1159 | .flags = OMAP_I2C_FLAG_NO_FIFO | | |
1160 | OMAP_I2C_FLAG_SIMPLE_CLOCK | | |
1161 | OMAP_I2C_FLAG_16BIT_DATA_REG | | |
1162 | OMAP_I2C_FLAG_BUS_SHIFT_2, | |
1163 | }; | |
1164 | ||
1165 | static struct omap_i2c_bus_platform_data omap2430_pdata = { | |
1166 | .rev = OMAP_I2C_IP_VERSION_1, | |
1167 | .flags = OMAP_I2C_FLAG_BUS_SHIFT_2 | | |
1168 | OMAP_I2C_FLAG_FORCE_19200_INT_CLK, | |
1169 | }; | |
1170 | ||
6145197b BC |
1171 | static struct omap_i2c_bus_platform_data omap3_pdata = { |
1172 | .rev = OMAP_I2C_IP_VERSION_1, | |
972deb4f | 1173 | .flags = OMAP_I2C_FLAG_BUS_SHIFT_2, |
6145197b BC |
1174 | }; |
1175 | ||
1176 | static struct omap_i2c_bus_platform_data omap4_pdata = { | |
1177 | .rev = OMAP_I2C_IP_VERSION_2, | |
1178 | }; | |
1179 | ||
1180 | static const struct of_device_id omap_i2c_of_match[] = { | |
1181 | { | |
1182 | .compatible = "ti,omap4-i2c", | |
1183 | .data = &omap4_pdata, | |
1184 | }, | |
1185 | { | |
1186 | .compatible = "ti,omap3-i2c", | |
1187 | .data = &omap3_pdata, | |
1188 | }, | |
4c624840 TL |
1189 | { |
1190 | .compatible = "ti,omap2430-i2c", | |
1191 | .data = &omap2430_pdata, | |
1192 | }, | |
1193 | { | |
1194 | .compatible = "ti,omap2420-i2c", | |
1195 | .data = &omap2420_pdata, | |
1196 | }, | |
6145197b BC |
1197 | { }, |
1198 | }; | |
1199 | MODULE_DEVICE_TABLE(of, omap_i2c_of_match); | |
1200 | #endif | |
1201 | ||
47dcd016 S |
1202 | #define OMAP_I2C_SCHEME(rev) ((rev & 0xc000) >> 14) |
1203 | ||
1204 | #define OMAP_I2C_REV_SCHEME_0_MAJOR(rev) (rev >> 4) | |
1205 | #define OMAP_I2C_REV_SCHEME_0_MINOR(rev) (rev & 0xf) | |
1206 | ||
1207 | #define OMAP_I2C_REV_SCHEME_1_MAJOR(rev) ((rev & 0x0700) >> 7) | |
1208 | #define OMAP_I2C_REV_SCHEME_1_MINOR(rev) (rev & 0x1f) | |
1209 | #define OMAP_I2C_SCHEME_0 0 | |
1210 | #define OMAP_I2C_SCHEME_1 1 | |
1211 | ||
0b255e92 | 1212 | static int |
010d442c KS |
1213 | omap_i2c_probe(struct platform_device *pdev) |
1214 | { | |
1215 | struct omap_i2c_dev *dev; | |
1216 | struct i2c_adapter *adap; | |
ac79e4b2 | 1217 | struct resource *mem; |
c4dba011 | 1218 | const struct omap_i2c_bus_platform_data *pdata = |
6d4028c6 | 1219 | dev_get_platdata(&pdev->dev); |
6145197b BC |
1220 | struct device_node *node = pdev->dev.of_node; |
1221 | const struct of_device_id *match; | |
ac79e4b2 | 1222 | int irq; |
010d442c | 1223 | int r; |
47dcd016 | 1224 | u32 rev; |
4368de19 | 1225 | u16 minor, major; |
010d442c | 1226 | |
ac79e4b2 FB |
1227 | irq = platform_get_irq(pdev, 0); |
1228 | if (irq < 0) { | |
010d442c | 1229 | dev_err(&pdev->dev, "no irq resource?\n"); |
ac79e4b2 | 1230 | return irq; |
010d442c KS |
1231 | } |
1232 | ||
d9ebd04d | 1233 | dev = devm_kzalloc(&pdev->dev, sizeof(struct omap_i2c_dev), GFP_KERNEL); |
46797a2a | 1234 | if (!dev) |
d9ebd04d | 1235 | return -ENOMEM; |
010d442c | 1236 | |
3cc2d009 | 1237 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
84dbf809 TR |
1238 | dev->base = devm_ioremap_resource(&pdev->dev, mem); |
1239 | if (IS_ERR(dev->base)) | |
1240 | return PTR_ERR(dev->base); | |
010d442c | 1241 | |
6c5aa407 | 1242 | match = of_match_device(of_match_ptr(omap_i2c_of_match), &pdev->dev); |
6145197b BC |
1243 | if (match) { |
1244 | u32 freq = 100000; /* default to 100000 Hz */ | |
1245 | ||
1246 | pdata = match->data; | |
6145197b BC |
1247 | dev->flags = pdata->flags; |
1248 | ||
1249 | of_property_read_u32(node, "clock-frequency", &freq); | |
1250 | /* convert DT freq value in Hz into kHz for speed */ | |
1251 | dev->speed = freq / 1000; | |
1252 | } else if (pdata != NULL) { | |
1253 | dev->speed = pdata->clkrate; | |
1254 | dev->flags = pdata->flags; | |
49839dc9 | 1255 | dev->set_mpu_wkup_lat = pdata->set_mpu_wkup_lat; |
20c9d2c4 | 1256 | } |
4574eb68 | 1257 | |
010d442c | 1258 | dev->dev = &pdev->dev; |
ac79e4b2 | 1259 | dev->irq = irq; |
55c381e4 | 1260 | |
3b2f8f82 | 1261 | spin_lock_init(&dev->lock); |
55c381e4 | 1262 | |
010d442c | 1263 | platform_set_drvdata(pdev, dev); |
0e33bbb2 | 1264 | init_completion(&dev->cmd_complete); |
010d442c | 1265 | |
6145197b | 1266 | dev->reg_shift = (dev->flags >> OMAP_I2C_FLAG_BUS_SHIFT__SHIFT) & 3; |
7c6bd201 | 1267 | |
7f4b08ee | 1268 | pm_runtime_enable(dev->dev); |
6d8451d5 FB |
1269 | pm_runtime_set_autosuspend_delay(dev->dev, OMAP_I2C_PM_TIMEOUT); |
1270 | pm_runtime_use_autosuspend(dev->dev); | |
1271 | ||
3b0fb97c | 1272 | r = pm_runtime_get_sync(dev->dev); |
ff370257 | 1273 | if (r < 0) |
3b0fb97c | 1274 | goto err_free_mem; |
010d442c | 1275 | |
47dcd016 S |
1276 | /* |
1277 | * Read the Rev hi bit-[15:14] ie scheme this is 1 indicates ver2. | |
1278 | * On omap1/3/2 Offset 4 is IE Reg the bit [15:14] is 0 at reset. | |
1279 | * Also since the omap_i2c_read_reg uses reg_map_ip_* a | |
40b13ca8 | 1280 | * readw_relaxed is done. |
47dcd016 | 1281 | */ |
40b13ca8 | 1282 | rev = readw_relaxed(dev->base + 0x04); |
47dcd016 | 1283 | |
4368de19 OD |
1284 | dev->scheme = OMAP_I2C_SCHEME(rev); |
1285 | switch (dev->scheme) { | |
47dcd016 S |
1286 | case OMAP_I2C_SCHEME_0: |
1287 | dev->regs = (u8 *)reg_map_ip_v1; | |
1288 | dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG); | |
1289 | minor = OMAP_I2C_REV_SCHEME_0_MAJOR(dev->rev); | |
1290 | major = OMAP_I2C_REV_SCHEME_0_MAJOR(dev->rev); | |
1291 | break; | |
1292 | case OMAP_I2C_SCHEME_1: | |
1293 | /* FALLTHROUGH */ | |
1294 | default: | |
1295 | dev->regs = (u8 *)reg_map_ip_v2; | |
1296 | rev = (rev << 16) | | |
1297 | omap_i2c_read_reg(dev, OMAP_I2C_IP_V2_REVNB_LO); | |
1298 | minor = OMAP_I2C_REV_SCHEME_1_MINOR(rev); | |
1299 | major = OMAP_I2C_REV_SCHEME_1_MAJOR(rev); | |
1300 | dev->rev = rev; | |
1301 | } | |
010d442c | 1302 | |
9aa8ec67 TK |
1303 | dev->errata = 0; |
1304 | ||
a748021c S |
1305 | if (dev->rev >= OMAP_I2C_REV_ON_2430 && |
1306 | dev->rev < OMAP_I2C_REV_ON_4430_PLUS) | |
9aa8ec67 TK |
1307 | dev->errata |= I2C_OMAP_ERRATA_I207; |
1308 | ||
f518b482 | 1309 | if (dev->rev <= OMAP_I2C_REV_ON_3430_3530) |
c8db38f0 | 1310 | dev->errata |= I2C_OMAP_ERRATA_I462; |
8a9d97d3 | 1311 | |
6145197b | 1312 | if (!(dev->flags & OMAP_I2C_FLAG_NO_FIFO)) { |
b6ee52c3 NM |
1313 | u16 s; |
1314 | ||
1315 | /* Set up the fifo size - Get total size */ | |
1316 | s = (omap_i2c_read_reg(dev, OMAP_I2C_BUFSTAT_REG) >> 14) & 0x3; | |
1317 | dev->fifo_size = 0x8 << s; | |
1318 | ||
1319 | /* | |
1320 | * Set up notification threshold as half the total available | |
1321 | * size. This is to ensure that we can handle the status on int | |
1322 | * call back latencies. | |
1323 | */ | |
1d5a34fe S |
1324 | |
1325 | dev->fifo_size = (dev->fifo_size / 2); | |
1326 | ||
47dcd016 | 1327 | if (dev->rev < OMAP_I2C_REV_ON_3630) |
f38e66e0 | 1328 | dev->b_hw = 1; /* Enable hardware fixes */ |
1d5a34fe | 1329 | |
20c9d2c4 | 1330 | /* calculate wakeup latency constraint for MPU */ |
49839dc9 PW |
1331 | if (dev->set_mpu_wkup_lat != NULL) |
1332 | dev->latency = (1000000 * dev->fifo_size) / | |
1333 | (1000 * dev->speed / 8); | |
b6ee52c3 NM |
1334 | } |
1335 | ||
010d442c KS |
1336 | /* reset ASAP, clearing any IRQs */ |
1337 | omap_i2c_init(dev); | |
1338 | ||
3b2f8f82 FB |
1339 | if (dev->rev < OMAP_I2C_OMAP1_REV_2) |
1340 | r = devm_request_irq(&pdev->dev, dev->irq, omap_i2c_omap1_isr, | |
1341 | IRQF_NO_SUSPEND, pdev->name, dev); | |
1342 | else | |
1343 | r = devm_request_threaded_irq(&pdev->dev, dev->irq, | |
1344 | omap_i2c_isr, omap_i2c_isr_thread, | |
1345 | IRQF_NO_SUSPEND | IRQF_ONESHOT, | |
1346 | pdev->name, dev); | |
010d442c KS |
1347 | |
1348 | if (r) { | |
1349 | dev_err(dev->dev, "failure requesting irq %i\n", dev->irq); | |
1350 | goto err_unuse_clocks; | |
1351 | } | |
9c76b878 | 1352 | |
010d442c KS |
1353 | adap = &dev->adapter; |
1354 | i2c_set_adapdata(adap, dev); | |
1355 | adap->owner = THIS_MODULE; | |
cfac71d9 | 1356 | adap->class = I2C_CLASS_DEPRECATED; |
783fd6fa | 1357 | strlcpy(adap->name, "OMAP I2C adapter", sizeof(adap->name)); |
010d442c KS |
1358 | adap->algo = &omap_i2c_algo; |
1359 | adap->dev.parent = &pdev->dev; | |
6145197b | 1360 | adap->dev.of_node = pdev->dev.of_node; |
010d442c KS |
1361 | |
1362 | /* i2c device drivers may be active on return from add_adapter() */ | |
7c175499 DB |
1363 | adap->nr = pdev->id; |
1364 | r = i2c_add_numbered_adapter(adap); | |
010d442c KS |
1365 | if (r) { |
1366 | dev_err(dev->dev, "failure adding adapter\n"); | |
d9ebd04d | 1367 | goto err_unuse_clocks; |
010d442c KS |
1368 | } |
1369 | ||
cd10c74a S |
1370 | dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n", adap->nr, |
1371 | major, minor, dev->speed); | |
c5d3cd6d | 1372 | |
6d8451d5 FB |
1373 | pm_runtime_mark_last_busy(dev->dev); |
1374 | pm_runtime_put_autosuspend(dev->dev); | |
62ff2c2b | 1375 | |
010d442c KS |
1376 | return 0; |
1377 | ||
010d442c | 1378 | err_unuse_clocks: |
3e39752d | 1379 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); |
fab67afb | 1380 | pm_runtime_put(dev->dev); |
24740516 | 1381 | pm_runtime_disable(&pdev->dev); |
010d442c | 1382 | err_free_mem: |
010d442c KS |
1383 | |
1384 | return r; | |
1385 | } | |
1386 | ||
0b255e92 | 1387 | static int omap_i2c_remove(struct platform_device *pdev) |
010d442c KS |
1388 | { |
1389 | struct omap_i2c_dev *dev = platform_get_drvdata(pdev); | |
3b0fb97c | 1390 | int ret; |
010d442c | 1391 | |
010d442c | 1392 | i2c_del_adapter(&dev->adapter); |
3b0fb97c | 1393 | ret = pm_runtime_get_sync(&pdev->dev); |
ff370257 | 1394 | if (ret < 0) |
3b0fb97c S |
1395 | return ret; |
1396 | ||
010d442c | 1397 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); |
0861f430 | 1398 | pm_runtime_put(&pdev->dev); |
24740516 | 1399 | pm_runtime_disable(&pdev->dev); |
010d442c KS |
1400 | return 0; |
1401 | } | |
1402 | ||
5692d2a2 | 1403 | #ifdef CONFIG_PM |
fab67afb KH |
1404 | static int omap_i2c_runtime_suspend(struct device *dev) |
1405 | { | |
1406 | struct platform_device *pdev = to_platform_device(dev); | |
1407 | struct omap_i2c_dev *_dev = platform_get_drvdata(pdev); | |
3dae3efb S |
1408 | |
1409 | _dev->iestate = omap_i2c_read_reg(_dev, OMAP_I2C_IE_REG); | |
bd16c82f | 1410 | |
4368de19 OD |
1411 | if (_dev->scheme == OMAP_I2C_SCHEME_0) |
1412 | omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, 0); | |
1413 | else | |
1414 | omap_i2c_write_reg(_dev, OMAP_I2C_IP_V2_IRQENABLE_CLR, | |
1415 | OMAP_I2C_IP_V2_INTERRUPTS_MASK); | |
fab67afb | 1416 | |
3dae3efb | 1417 | if (_dev->rev < OMAP_I2C_OMAP1_REV_2) { |
27e0fbef | 1418 | omap_i2c_read_reg(_dev, OMAP_I2C_IV_REG); /* Read clears */ |
3dae3efb S |
1419 | } else { |
1420 | omap_i2c_write_reg(_dev, OMAP_I2C_STAT_REG, _dev->iestate); | |
fab67afb | 1421 | |
3dae3efb S |
1422 | /* Flush posted write */ |
1423 | omap_i2c_read_reg(_dev, OMAP_I2C_STAT_REG); | |
1424 | } | |
fab67afb KH |
1425 | |
1426 | return 0; | |
1427 | } | |
1428 | ||
1429 | static int omap_i2c_runtime_resume(struct device *dev) | |
1430 | { | |
1431 | struct platform_device *pdev = to_platform_device(dev); | |
1432 | struct omap_i2c_dev *_dev = platform_get_drvdata(pdev); | |
1433 | ||
47dcd016 S |
1434 | if (!_dev->regs) |
1435 | return 0; | |
1436 | ||
554c9674 | 1437 | __omap_i2c_init(_dev); |
fab67afb KH |
1438 | |
1439 | return 0; | |
1440 | } | |
1441 | ||
1442 | static struct dev_pm_ops omap_i2c_pm_ops = { | |
5692d2a2 S |
1443 | SET_RUNTIME_PM_OPS(omap_i2c_runtime_suspend, |
1444 | omap_i2c_runtime_resume, NULL) | |
fab67afb KH |
1445 | }; |
1446 | #define OMAP_I2C_PM_OPS (&omap_i2c_pm_ops) | |
1447 | #else | |
1448 | #define OMAP_I2C_PM_OPS NULL | |
5692d2a2 | 1449 | #endif /* CONFIG_PM */ |
fab67afb | 1450 | |
010d442c KS |
1451 | static struct platform_driver omap_i2c_driver = { |
1452 | .probe = omap_i2c_probe, | |
0b255e92 | 1453 | .remove = omap_i2c_remove, |
010d442c | 1454 | .driver = { |
f7bb0d9a | 1455 | .name = "omap_i2c", |
fab67afb | 1456 | .pm = OMAP_I2C_PM_OPS, |
6145197b | 1457 | .of_match_table = of_match_ptr(omap_i2c_of_match), |
010d442c KS |
1458 | }, |
1459 | }; | |
1460 | ||
1461 | /* I2C may be needed to bring up other drivers */ | |
1462 | static int __init | |
1463 | omap_i2c_init_driver(void) | |
1464 | { | |
1465 | return platform_driver_register(&omap_i2c_driver); | |
1466 | } | |
1467 | subsys_initcall(omap_i2c_init_driver); | |
1468 | ||
1469 | static void __exit omap_i2c_exit_driver(void) | |
1470 | { | |
1471 | platform_driver_unregister(&omap_i2c_driver); | |
1472 | } | |
1473 | module_exit(omap_i2c_exit_driver); | |
1474 | ||
1475 | MODULE_AUTHOR("MontaVista Software, Inc. (and others)"); | |
1476 | MODULE_DESCRIPTION("TI OMAP I2C bus adapter"); | |
1477 | MODULE_LICENSE("GPL"); | |
f7bb0d9a | 1478 | MODULE_ALIAS("platform:omap_i2c"); |