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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. | |
25 | * | |
26 | * You should have received a copy of the GNU General Public License | |
27 | * along with this program; if not, write to the Free Software | |
28 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
29 | */ | |
30 | ||
31 | #include <linux/module.h> | |
32 | #include <linux/delay.h> | |
33 | #include <linux/i2c.h> | |
34 | #include <linux/err.h> | |
35 | #include <linux/interrupt.h> | |
36 | #include <linux/completion.h> | |
37 | #include <linux/platform_device.h> | |
38 | #include <linux/clk.h> | |
c1a473bd | 39 | #include <linux/io.h> |
6145197b BC |
40 | #include <linux/of.h> |
41 | #include <linux/of_i2c.h> | |
42 | #include <linux/of_device.h> | |
5a0e3ad6 | 43 | #include <linux/slab.h> |
20c9d2c4 | 44 | #include <linux/i2c-omap.h> |
27b1fec2 | 45 | #include <linux/pm_runtime.h> |
010d442c | 46 | |
9c76b878 | 47 | /* I2C controller revisions */ |
4e80f727 | 48 | #define OMAP_I2C_OMAP1_REV_2 0x20 |
9c76b878 PW |
49 | |
50 | /* I2C controller revisions present on specific hardware */ | |
51 | #define OMAP_I2C_REV_ON_2430 0x36 | |
f518b482 JH |
52 | #define OMAP_I2C_REV_ON_3430_3530 0x3C |
53 | #define OMAP_I2C_REV_ON_3630_4430 0x40 | |
9c76b878 | 54 | |
010d442c KS |
55 | /* timeout waiting for the controller to respond */ |
56 | #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000)) | |
57 | ||
5043e9e7 | 58 | /* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */ |
f38e66e0 SS |
59 | enum { |
60 | OMAP_I2C_REV_REG = 0, | |
61 | OMAP_I2C_IE_REG, | |
62 | OMAP_I2C_STAT_REG, | |
63 | OMAP_I2C_IV_REG, | |
64 | OMAP_I2C_WE_REG, | |
65 | OMAP_I2C_SYSS_REG, | |
66 | OMAP_I2C_BUF_REG, | |
67 | OMAP_I2C_CNT_REG, | |
68 | OMAP_I2C_DATA_REG, | |
69 | OMAP_I2C_SYSC_REG, | |
70 | OMAP_I2C_CON_REG, | |
71 | OMAP_I2C_OA_REG, | |
72 | OMAP_I2C_SA_REG, | |
73 | OMAP_I2C_PSC_REG, | |
74 | OMAP_I2C_SCLL_REG, | |
75 | OMAP_I2C_SCLH_REG, | |
76 | OMAP_I2C_SYSTEST_REG, | |
77 | OMAP_I2C_BUFSTAT_REG, | |
b8853088 AG |
78 | /* only on OMAP4430 */ |
79 | OMAP_I2C_IP_V2_REVNB_LO, | |
80 | OMAP_I2C_IP_V2_REVNB_HI, | |
81 | OMAP_I2C_IP_V2_IRQSTATUS_RAW, | |
82 | OMAP_I2C_IP_V2_IRQENABLE_SET, | |
83 | OMAP_I2C_IP_V2_IRQENABLE_CLR, | |
f38e66e0 | 84 | }; |
010d442c KS |
85 | |
86 | /* I2C Interrupt Enable Register (OMAP_I2C_IE): */ | |
b6ee52c3 NM |
87 | #define OMAP_I2C_IE_XDR (1 << 14) /* TX Buffer drain int enable */ |
88 | #define OMAP_I2C_IE_RDR (1 << 13) /* RX Buffer drain int enable */ | |
010d442c KS |
89 | #define OMAP_I2C_IE_XRDY (1 << 4) /* TX data ready int enable */ |
90 | #define OMAP_I2C_IE_RRDY (1 << 3) /* RX data ready int enable */ | |
91 | #define OMAP_I2C_IE_ARDY (1 << 2) /* Access ready int enable */ | |
92 | #define OMAP_I2C_IE_NACK (1 << 1) /* No ack interrupt enable */ | |
93 | #define OMAP_I2C_IE_AL (1 << 0) /* Arbitration lost int ena */ | |
94 | ||
95 | /* I2C Status Register (OMAP_I2C_STAT): */ | |
b6ee52c3 NM |
96 | #define OMAP_I2C_STAT_XDR (1 << 14) /* TX Buffer draining */ |
97 | #define OMAP_I2C_STAT_RDR (1 << 13) /* RX Buffer draining */ | |
010d442c KS |
98 | #define OMAP_I2C_STAT_BB (1 << 12) /* Bus busy */ |
99 | #define OMAP_I2C_STAT_ROVR (1 << 11) /* Receive overrun */ | |
100 | #define OMAP_I2C_STAT_XUDF (1 << 10) /* Transmit underflow */ | |
101 | #define OMAP_I2C_STAT_AAS (1 << 9) /* Address as slave */ | |
102 | #define OMAP_I2C_STAT_AD0 (1 << 8) /* Address zero */ | |
103 | #define OMAP_I2C_STAT_XRDY (1 << 4) /* Transmit data ready */ | |
104 | #define OMAP_I2C_STAT_RRDY (1 << 3) /* Receive data ready */ | |
105 | #define OMAP_I2C_STAT_ARDY (1 << 2) /* Register access ready */ | |
106 | #define OMAP_I2C_STAT_NACK (1 << 1) /* No ack interrupt enable */ | |
107 | #define OMAP_I2C_STAT_AL (1 << 0) /* Arbitration lost int ena */ | |
108 | ||
5043e9e7 KJ |
109 | /* I2C WE wakeup enable register */ |
110 | #define OMAP_I2C_WE_XDR_WE (1 << 14) /* TX drain wakup */ | |
111 | #define OMAP_I2C_WE_RDR_WE (1 << 13) /* RX drain wakeup */ | |
112 | #define OMAP_I2C_WE_AAS_WE (1 << 9) /* Address as slave wakeup*/ | |
113 | #define OMAP_I2C_WE_BF_WE (1 << 8) /* Bus free wakeup */ | |
114 | #define OMAP_I2C_WE_STC_WE (1 << 6) /* Start condition wakeup */ | |
115 | #define OMAP_I2C_WE_GC_WE (1 << 5) /* General call wakeup */ | |
116 | #define OMAP_I2C_WE_DRDY_WE (1 << 3) /* TX/RX data ready wakeup */ | |
117 | #define OMAP_I2C_WE_ARDY_WE (1 << 2) /* Reg access ready wakeup */ | |
118 | #define OMAP_I2C_WE_NACK_WE (1 << 1) /* No acknowledgment wakeup */ | |
119 | #define OMAP_I2C_WE_AL_WE (1 << 0) /* Arbitration lost wakeup */ | |
120 | ||
121 | #define OMAP_I2C_WE_ALL (OMAP_I2C_WE_XDR_WE | OMAP_I2C_WE_RDR_WE | \ | |
122 | OMAP_I2C_WE_AAS_WE | OMAP_I2C_WE_BF_WE | \ | |
123 | OMAP_I2C_WE_STC_WE | OMAP_I2C_WE_GC_WE | \ | |
124 | OMAP_I2C_WE_DRDY_WE | OMAP_I2C_WE_ARDY_WE | \ | |
125 | OMAP_I2C_WE_NACK_WE | OMAP_I2C_WE_AL_WE) | |
126 | ||
010d442c KS |
127 | /* I2C Buffer Configuration Register (OMAP_I2C_BUF): */ |
128 | #define OMAP_I2C_BUF_RDMA_EN (1 << 15) /* RX DMA channel enable */ | |
b6ee52c3 | 129 | #define OMAP_I2C_BUF_RXFIF_CLR (1 << 14) /* RX FIFO Clear */ |
010d442c | 130 | #define OMAP_I2C_BUF_XDMA_EN (1 << 7) /* TX DMA channel enable */ |
b6ee52c3 | 131 | #define OMAP_I2C_BUF_TXFIF_CLR (1 << 6) /* TX FIFO Clear */ |
010d442c KS |
132 | |
133 | /* I2C Configuration Register (OMAP_I2C_CON): */ | |
134 | #define OMAP_I2C_CON_EN (1 << 15) /* I2C module enable */ | |
135 | #define OMAP_I2C_CON_BE (1 << 14) /* Big endian mode */ | |
b6ee52c3 | 136 | #define OMAP_I2C_CON_OPMODE_HS (1 << 12) /* High Speed support */ |
010d442c KS |
137 | #define OMAP_I2C_CON_STB (1 << 11) /* Start byte mode (master) */ |
138 | #define OMAP_I2C_CON_MST (1 << 10) /* Master/slave mode */ | |
139 | #define OMAP_I2C_CON_TRX (1 << 9) /* TX/RX mode (master only) */ | |
140 | #define OMAP_I2C_CON_XA (1 << 8) /* Expand address */ | |
141 | #define OMAP_I2C_CON_RM (1 << 2) /* Repeat mode (master only) */ | |
142 | #define OMAP_I2C_CON_STP (1 << 1) /* Stop cond (master only) */ | |
143 | #define OMAP_I2C_CON_STT (1 << 0) /* Start condition (master) */ | |
144 | ||
4574eb68 SMK |
145 | /* I2C SCL time value when Master */ |
146 | #define OMAP_I2C_SCLL_HSSCLL 8 | |
147 | #define OMAP_I2C_SCLH_HSSCLH 8 | |
148 | ||
010d442c KS |
149 | /* I2C System Test Register (OMAP_I2C_SYSTEST): */ |
150 | #ifdef DEBUG | |
151 | #define OMAP_I2C_SYSTEST_ST_EN (1 << 15) /* System test enable */ | |
152 | #define OMAP_I2C_SYSTEST_FREE (1 << 14) /* Free running mode */ | |
153 | #define OMAP_I2C_SYSTEST_TMODE_MASK (3 << 12) /* Test mode select */ | |
154 | #define OMAP_I2C_SYSTEST_TMODE_SHIFT (12) /* Test mode select */ | |
155 | #define OMAP_I2C_SYSTEST_SCL_I (1 << 3) /* SCL line sense in */ | |
156 | #define OMAP_I2C_SYSTEST_SCL_O (1 << 2) /* SCL line drive out */ | |
157 | #define OMAP_I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense in */ | |
158 | #define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */ | |
159 | #endif | |
160 | ||
fdd07fe6 PW |
161 | /* OCP_SYSSTATUS bit definitions */ |
162 | #define SYSS_RESETDONE_MASK (1 << 0) | |
163 | ||
164 | /* OCP_SYSCONFIG bit definitions */ | |
165 | #define SYSC_CLOCKACTIVITY_MASK (0x3 << 8) | |
166 | #define SYSC_SIDLEMODE_MASK (0x3 << 3) | |
167 | #define SYSC_ENAWAKEUP_MASK (1 << 2) | |
168 | #define SYSC_SOFTRESET_MASK (1 << 1) | |
169 | #define SYSC_AUTOIDLE_MASK (1 << 0) | |
170 | ||
171 | #define SYSC_IDLEMODE_SMART 0x2 | |
172 | #define SYSC_CLOCKACTIVITY_FCLK 0x2 | |
010d442c | 173 | |
f3083d92 | 174 | /* Errata definitions */ |
175 | #define I2C_OMAP_ERRATA_I207 (1 << 0) | |
c8db38f0 | 176 | #define I2C_OMAP_ERRATA_I462 (1 << 1) |
010d442c | 177 | |
010d442c KS |
178 | struct omap_i2c_dev { |
179 | struct device *dev; | |
180 | void __iomem *base; /* virtual */ | |
181 | int irq; | |
d84d3ea3 | 182 | int reg_shift; /* bit shift for I2C register addresses */ |
010d442c KS |
183 | struct completion cmd_complete; |
184 | struct resource *ioarea; | |
20c9d2c4 KJ |
185 | u32 latency; /* maximum mpu wkup latency */ |
186 | void (*set_mpu_wkup_lat)(struct device *dev, | |
187 | long latency); | |
6145197b BC |
188 | u32 speed; /* Speed of bus in kHz */ |
189 | u32 dtrev; /* extra revision from DT */ | |
190 | u32 flags; | |
010d442c KS |
191 | u16 cmd_err; |
192 | u8 *buf; | |
f38e66e0 | 193 | u8 *regs; |
010d442c KS |
194 | size_t buf_len; |
195 | struct i2c_adapter adapter; | |
dd74548d | 196 | u8 threshold; |
b6ee52c3 NM |
197 | u8 fifo_size; /* use as flag and value |
198 | * fifo_size==0 implies no fifo | |
199 | * if set, should be trsh+1 | |
200 | */ | |
9c76b878 | 201 | u8 rev; |
b6ee52c3 | 202 | unsigned b_hw:1; /* bad h/w fixes */ |
079d8af2 | 203 | unsigned receiver:1; /* true when we're in receiver mode */ |
f08ac4e7 | 204 | u16 iestate; /* Saved interrupt register */ |
ef871432 RN |
205 | u16 pscstate; |
206 | u16 scllstate; | |
207 | u16 sclhstate; | |
208 | u16 bufstate; | |
209 | u16 syscstate; | |
210 | u16 westate; | |
f3083d92 | 211 | u16 errata; |
010d442c KS |
212 | }; |
213 | ||
a1295577 | 214 | static const u8 reg_map_ip_v1[] = { |
f38e66e0 SS |
215 | [OMAP_I2C_REV_REG] = 0x00, |
216 | [OMAP_I2C_IE_REG] = 0x01, | |
217 | [OMAP_I2C_STAT_REG] = 0x02, | |
218 | [OMAP_I2C_IV_REG] = 0x03, | |
219 | [OMAP_I2C_WE_REG] = 0x03, | |
220 | [OMAP_I2C_SYSS_REG] = 0x04, | |
221 | [OMAP_I2C_BUF_REG] = 0x05, | |
222 | [OMAP_I2C_CNT_REG] = 0x06, | |
223 | [OMAP_I2C_DATA_REG] = 0x07, | |
224 | [OMAP_I2C_SYSC_REG] = 0x08, | |
225 | [OMAP_I2C_CON_REG] = 0x09, | |
226 | [OMAP_I2C_OA_REG] = 0x0a, | |
227 | [OMAP_I2C_SA_REG] = 0x0b, | |
228 | [OMAP_I2C_PSC_REG] = 0x0c, | |
229 | [OMAP_I2C_SCLL_REG] = 0x0d, | |
230 | [OMAP_I2C_SCLH_REG] = 0x0e, | |
231 | [OMAP_I2C_SYSTEST_REG] = 0x0f, | |
232 | [OMAP_I2C_BUFSTAT_REG] = 0x10, | |
233 | }; | |
234 | ||
a1295577 | 235 | static const u8 reg_map_ip_v2[] = { |
f38e66e0 SS |
236 | [OMAP_I2C_REV_REG] = 0x04, |
237 | [OMAP_I2C_IE_REG] = 0x2c, | |
238 | [OMAP_I2C_STAT_REG] = 0x28, | |
239 | [OMAP_I2C_IV_REG] = 0x34, | |
240 | [OMAP_I2C_WE_REG] = 0x34, | |
241 | [OMAP_I2C_SYSS_REG] = 0x90, | |
242 | [OMAP_I2C_BUF_REG] = 0x94, | |
243 | [OMAP_I2C_CNT_REG] = 0x98, | |
244 | [OMAP_I2C_DATA_REG] = 0x9c, | |
2727b175 | 245 | [OMAP_I2C_SYSC_REG] = 0x10, |
f38e66e0 SS |
246 | [OMAP_I2C_CON_REG] = 0xa4, |
247 | [OMAP_I2C_OA_REG] = 0xa8, | |
248 | [OMAP_I2C_SA_REG] = 0xac, | |
249 | [OMAP_I2C_PSC_REG] = 0xb0, | |
250 | [OMAP_I2C_SCLL_REG] = 0xb4, | |
251 | [OMAP_I2C_SCLH_REG] = 0xb8, | |
252 | [OMAP_I2C_SYSTEST_REG] = 0xbC, | |
253 | [OMAP_I2C_BUFSTAT_REG] = 0xc0, | |
b8853088 AG |
254 | [OMAP_I2C_IP_V2_REVNB_LO] = 0x00, |
255 | [OMAP_I2C_IP_V2_REVNB_HI] = 0x04, | |
256 | [OMAP_I2C_IP_V2_IRQSTATUS_RAW] = 0x24, | |
257 | [OMAP_I2C_IP_V2_IRQENABLE_SET] = 0x2c, | |
258 | [OMAP_I2C_IP_V2_IRQENABLE_CLR] = 0x30, | |
f38e66e0 SS |
259 | }; |
260 | ||
010d442c KS |
261 | static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev, |
262 | int reg, u16 val) | |
263 | { | |
f38e66e0 SS |
264 | __raw_writew(val, i2c_dev->base + |
265 | (i2c_dev->regs[reg] << i2c_dev->reg_shift)); | |
010d442c KS |
266 | } |
267 | ||
268 | static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg) | |
269 | { | |
f38e66e0 SS |
270 | return __raw_readw(i2c_dev->base + |
271 | (i2c_dev->regs[reg] << i2c_dev->reg_shift)); | |
010d442c KS |
272 | } |
273 | ||
010d442c KS |
274 | static int omap_i2c_init(struct omap_i2c_dev *dev) |
275 | { | |
ef871432 | 276 | u16 psc = 0, scll = 0, sclh = 0, buf = 0; |
4574eb68 | 277 | u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0; |
010d442c KS |
278 | unsigned long fclk_rate = 12000000; |
279 | unsigned long timeout; | |
4574eb68 | 280 | unsigned long internal_clk = 0; |
27b1fec2 | 281 | struct clk *fclk; |
010d442c | 282 | |
4e80f727 | 283 | if (dev->rev >= OMAP_I2C_OMAP1_REV_2) { |
57eb81b1 MG |
284 | /* Disable I2C controller before soft reset */ |
285 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, | |
286 | omap_i2c_read_reg(dev, OMAP_I2C_CON_REG) & | |
287 | ~(OMAP_I2C_CON_EN)); | |
288 | ||
fdd07fe6 | 289 | omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK); |
010d442c KS |
290 | /* For some reason we need to set the EN bit before the |
291 | * reset done bit gets set. */ | |
292 | timeout = jiffies + OMAP_I2C_TIMEOUT; | |
293 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); | |
294 | while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) & | |
fdd07fe6 | 295 | SYSS_RESETDONE_MASK)) { |
010d442c | 296 | if (time_after(jiffies, timeout)) { |
fce3ff03 | 297 | dev_warn(dev->dev, "timeout waiting " |
010d442c KS |
298 | "for controller reset\n"); |
299 | return -ETIMEDOUT; | |
300 | } | |
301 | msleep(1); | |
302 | } | |
fdd07fe6 PW |
303 | |
304 | /* SYSC register is cleared by the reset; rewrite it */ | |
305 | if (dev->rev == OMAP_I2C_REV_ON_2430) { | |
306 | ||
307 | omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, | |
308 | SYSC_AUTOIDLE_MASK); | |
309 | ||
f518b482 | 310 | } else if (dev->rev >= OMAP_I2C_REV_ON_3430_3530) { |
ef871432 RN |
311 | dev->syscstate = SYSC_AUTOIDLE_MASK; |
312 | dev->syscstate |= SYSC_ENAWAKEUP_MASK; | |
313 | dev->syscstate |= (SYSC_IDLEMODE_SMART << | |
fdd07fe6 | 314 | __ffs(SYSC_SIDLEMODE_MASK)); |
ef871432 | 315 | dev->syscstate |= (SYSC_CLOCKACTIVITY_FCLK << |
fdd07fe6 PW |
316 | __ffs(SYSC_CLOCKACTIVITY_MASK)); |
317 | ||
ef871432 RN |
318 | omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, |
319 | dev->syscstate); | |
5043e9e7 KJ |
320 | /* |
321 | * Enabling all wakup sources to stop I2C freezing on | |
322 | * WFI instruction. | |
323 | * REVISIT: Some wkup sources might not be needed. | |
324 | */ | |
ef871432 | 325 | dev->westate = OMAP_I2C_WE_ALL; |
cb28e582 S |
326 | omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, |
327 | dev->westate); | |
fdd07fe6 | 328 | } |
010d442c KS |
329 | } |
330 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); | |
331 | ||
6145197b | 332 | if (dev->flags & OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK) { |
0e9ae109 RK |
333 | /* |
334 | * The I2C functional clock is the armxor_ck, so there's | |
335 | * no need to get "armxor_ck" separately. Now, if OMAP2420 | |
336 | * always returns 12MHz for the functional clock, we can | |
337 | * do this bit unconditionally. | |
338 | */ | |
27b1fec2 RN |
339 | fclk = clk_get(dev->dev, "fck"); |
340 | fclk_rate = clk_get_rate(fclk); | |
341 | clk_put(fclk); | |
0e9ae109 | 342 | |
010d442c KS |
343 | /* TRM for 5912 says the I2C clock must be prescaled to be |
344 | * between 7 - 12 MHz. The XOR input clock is typically | |
345 | * 12, 13 or 19.2 MHz. So we should have code that produces: | |
346 | * | |
347 | * XOR MHz Divider Prescaler | |
348 | * 12 1 0 | |
349 | * 13 2 1 | |
350 | * 19.2 2 1 | |
351 | */ | |
d7aef138 JD |
352 | if (fclk_rate > 12000000) |
353 | psc = fclk_rate / 12000000; | |
010d442c KS |
354 | } |
355 | ||
6145197b | 356 | if (!(dev->flags & OMAP_I2C_FLAG_SIMPLE_CLOCK)) { |
4574eb68 | 357 | |
84bf2c86 AK |
358 | /* |
359 | * HSI2C controller internal clk rate should be 19.2 Mhz for | |
360 | * HS and for all modes on 2430. On 34xx we can use lower rate | |
361 | * to get longer filter period for better noise suppression. | |
362 | * The filter is iclk (fclk for HS) period. | |
363 | */ | |
3be0053e | 364 | if (dev->speed > 400 || |
6145197b | 365 | dev->flags & OMAP_I2C_FLAG_FORCE_19200_INT_CLK) |
84bf2c86 AK |
366 | internal_clk = 19200; |
367 | else if (dev->speed > 100) | |
368 | internal_clk = 9600; | |
369 | else | |
370 | internal_clk = 4000; | |
27b1fec2 RN |
371 | fclk = clk_get(dev->dev, "fck"); |
372 | fclk_rate = clk_get_rate(fclk) / 1000; | |
373 | clk_put(fclk); | |
4574eb68 SMK |
374 | |
375 | /* Compute prescaler divisor */ | |
376 | psc = fclk_rate / internal_clk; | |
377 | psc = psc - 1; | |
378 | ||
379 | /* If configured for High Speed */ | |
380 | if (dev->speed > 400) { | |
baf46b4e AK |
381 | unsigned long scl; |
382 | ||
4574eb68 | 383 | /* For first phase of HS mode */ |
baf46b4e AK |
384 | scl = internal_clk / 400; |
385 | fsscll = scl - (scl / 3) - 7; | |
386 | fssclh = (scl / 3) - 5; | |
4574eb68 SMK |
387 | |
388 | /* For second phase of HS mode */ | |
baf46b4e AK |
389 | scl = fclk_rate / dev->speed; |
390 | hsscll = scl - (scl / 3) - 7; | |
391 | hssclh = (scl / 3) - 5; | |
392 | } else if (dev->speed > 100) { | |
393 | unsigned long scl; | |
394 | ||
395 | /* Fast mode */ | |
396 | scl = internal_clk / dev->speed; | |
397 | fsscll = scl - (scl / 3) - 7; | |
398 | fssclh = (scl / 3) - 5; | |
4574eb68 | 399 | } else { |
baf46b4e AK |
400 | /* Standard mode */ |
401 | fsscll = internal_clk / (dev->speed * 2) - 7; | |
402 | fssclh = internal_clk / (dev->speed * 2) - 5; | |
4574eb68 SMK |
403 | } |
404 | scll = (hsscll << OMAP_I2C_SCLL_HSSCLL) | fsscll; | |
405 | sclh = (hssclh << OMAP_I2C_SCLH_HSSCLH) | fssclh; | |
406 | } else { | |
407 | /* Program desired operating rate */ | |
408 | fclk_rate /= (psc + 1) * 1000; | |
409 | if (psc > 2) | |
410 | psc = 2; | |
411 | scll = fclk_rate / (dev->speed * 2) - 7 + psc; | |
412 | sclh = fclk_rate / (dev->speed * 2) - 7 + psc; | |
413 | } | |
414 | ||
010d442c KS |
415 | /* Setup clock prescaler to obtain approx 12MHz I2C module clock: */ |
416 | omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, psc); | |
417 | ||
4574eb68 SMK |
418 | /* SCL low and high time values */ |
419 | omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, scll); | |
420 | omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, sclh); | |
010d442c KS |
421 | |
422 | /* Take the I2C module out of reset: */ | |
423 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); | |
424 | ||
425 | /* Enable interrupts */ | |
ef871432 | 426 | dev->iestate = (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY | |
c1a473bd TL |
427 | OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK | |
428 | OMAP_I2C_IE_AL) | ((dev->fifo_size) ? | |
ef871432 RN |
429 | (OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0); |
430 | omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate); | |
6145197b | 431 | if (dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) { |
ef871432 RN |
432 | dev->pscstate = psc; |
433 | dev->scllstate = scll; | |
434 | dev->sclhstate = sclh; | |
435 | dev->bufstate = buf; | |
436 | } | |
010d442c KS |
437 | return 0; |
438 | } | |
439 | ||
440 | /* | |
441 | * Waiting on Bus Busy | |
442 | */ | |
443 | static int omap_i2c_wait_for_bb(struct omap_i2c_dev *dev) | |
444 | { | |
445 | unsigned long timeout; | |
446 | ||
447 | timeout = jiffies + OMAP_I2C_TIMEOUT; | |
448 | while (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) & OMAP_I2C_STAT_BB) { | |
449 | if (time_after(jiffies, timeout)) { | |
450 | dev_warn(dev->dev, "timeout waiting for bus ready\n"); | |
451 | return -ETIMEDOUT; | |
452 | } | |
453 | msleep(1); | |
454 | } | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
dd74548d FB |
459 | static void omap_i2c_resize_fifo(struct omap_i2c_dev *dev, u8 size, bool is_rx) |
460 | { | |
461 | u16 buf; | |
462 | ||
463 | if (dev->flags & OMAP_I2C_FLAG_NO_FIFO) | |
464 | return; | |
465 | ||
466 | /* | |
467 | * Set up notification threshold based on message size. We're doing | |
468 | * this to try and avoid draining feature as much as possible. Whenever | |
469 | * we have big messages to transfer (bigger than our total fifo size) | |
470 | * then we might use draining feature to transfer the remaining bytes. | |
471 | */ | |
472 | ||
473 | dev->threshold = clamp(size, (u8) 1, dev->fifo_size); | |
474 | ||
475 | buf = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG); | |
476 | ||
477 | if (is_rx) { | |
478 | /* Clear RX Threshold */ | |
479 | buf &= ~(0x3f << 8); | |
480 | buf |= ((dev->threshold - 1) << 8) | OMAP_I2C_BUF_RXFIF_CLR; | |
481 | } else { | |
482 | /* Clear TX Threshold */ | |
483 | buf &= ~0x3f; | |
484 | buf |= (dev->threshold - 1) | OMAP_I2C_BUF_TXFIF_CLR; | |
485 | } | |
486 | ||
487 | omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, buf); | |
488 | ||
489 | if (dev->rev < OMAP_I2C_REV_ON_3630_4430) | |
490 | dev->b_hw = 1; /* Enable hardware fixes */ | |
491 | ||
492 | /* calculate wakeup latency constraint for MPU */ | |
493 | if (dev->set_mpu_wkup_lat != NULL) | |
494 | dev->latency = (1000000 * dev->threshold) / | |
495 | (1000 * dev->speed / 8); | |
496 | } | |
497 | ||
010d442c KS |
498 | /* |
499 | * Low level master read/write transaction. | |
500 | */ | |
501 | static int omap_i2c_xfer_msg(struct i2c_adapter *adap, | |
502 | struct i2c_msg *msg, int stop) | |
503 | { | |
504 | struct omap_i2c_dev *dev = i2c_get_adapdata(adap); | |
33d54985 | 505 | unsigned long timeout; |
010d442c KS |
506 | u16 w; |
507 | ||
508 | dev_dbg(dev->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n", | |
509 | msg->addr, msg->len, msg->flags, stop); | |
510 | ||
511 | if (msg->len == 0) | |
512 | return -EINVAL; | |
513 | ||
dd74548d FB |
514 | dev->receiver = !!(msg->flags & I2C_M_RD); |
515 | omap_i2c_resize_fifo(dev, msg->len, dev->receiver); | |
516 | ||
010d442c KS |
517 | omap_i2c_write_reg(dev, OMAP_I2C_SA_REG, msg->addr); |
518 | ||
519 | /* REVISIT: Could the STB bit of I2C_CON be used with probing? */ | |
520 | dev->buf = msg->buf; | |
521 | dev->buf_len = msg->len; | |
522 | ||
523 | omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len); | |
524 | ||
b6ee52c3 NM |
525 | /* Clear the FIFO Buffers */ |
526 | w = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG); | |
527 | w |= OMAP_I2C_BUF_RXFIF_CLR | OMAP_I2C_BUF_TXFIF_CLR; | |
528 | omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, w); | |
529 | ||
0e33bbb2 | 530 | INIT_COMPLETION(dev->cmd_complete); |
010d442c KS |
531 | dev->cmd_err = 0; |
532 | ||
533 | w = OMAP_I2C_CON_EN | OMAP_I2C_CON_MST | OMAP_I2C_CON_STT; | |
4574eb68 SMK |
534 | |
535 | /* High speed configuration */ | |
536 | if (dev->speed > 400) | |
b6ee52c3 | 537 | w |= OMAP_I2C_CON_OPMODE_HS; |
4574eb68 | 538 | |
fb604a3d LP |
539 | if (msg->flags & I2C_M_STOP) |
540 | stop = 1; | |
010d442c KS |
541 | if (msg->flags & I2C_M_TEN) |
542 | w |= OMAP_I2C_CON_XA; | |
543 | if (!(msg->flags & I2C_M_RD)) | |
544 | w |= OMAP_I2C_CON_TRX; | |
c1a473bd | 545 | |
b6ee52c3 | 546 | if (!dev->b_hw && stop) |
010d442c | 547 | w |= OMAP_I2C_CON_STP; |
c1a473bd | 548 | |
010d442c KS |
549 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); |
550 | ||
b6ee52c3 NM |
551 | /* |
552 | * Don't write stt and stp together on some hardware. | |
553 | */ | |
554 | if (dev->b_hw && stop) { | |
555 | unsigned long delay = jiffies + OMAP_I2C_TIMEOUT; | |
556 | u16 con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); | |
557 | while (con & OMAP_I2C_CON_STT) { | |
558 | con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); | |
559 | ||
560 | /* Let the user know if i2c is in a bad state */ | |
561 | if (time_after(jiffies, delay)) { | |
562 | dev_err(dev->dev, "controller timed out " | |
563 | "waiting for start condition to finish\n"); | |
564 | return -ETIMEDOUT; | |
565 | } | |
566 | cpu_relax(); | |
567 | } | |
568 | ||
569 | w |= OMAP_I2C_CON_STP; | |
570 | w &= ~OMAP_I2C_CON_STT; | |
571 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); | |
572 | } | |
573 | ||
b7af349b JN |
574 | /* |
575 | * REVISIT: We should abort the transfer on signals, but the bus goes | |
576 | * into arbitration and we're currently unable to recover from it. | |
577 | */ | |
33d54985 S |
578 | timeout = wait_for_completion_timeout(&dev->cmd_complete, |
579 | OMAP_I2C_TIMEOUT); | |
010d442c | 580 | dev->buf_len = 0; |
33d54985 | 581 | if (timeout == 0) { |
010d442c KS |
582 | dev_err(dev->dev, "controller timed out\n"); |
583 | omap_i2c_init(dev); | |
584 | return -ETIMEDOUT; | |
585 | } | |
586 | ||
587 | if (likely(!dev->cmd_err)) | |
588 | return 0; | |
589 | ||
590 | /* We have an error */ | |
591 | if (dev->cmd_err & (OMAP_I2C_STAT_AL | OMAP_I2C_STAT_ROVR | | |
592 | OMAP_I2C_STAT_XUDF)) { | |
593 | omap_i2c_init(dev); | |
594 | return -EIO; | |
595 | } | |
596 | ||
597 | if (dev->cmd_err & OMAP_I2C_STAT_NACK) { | |
598 | if (msg->flags & I2C_M_IGNORE_NAK) | |
599 | return 0; | |
600 | if (stop) { | |
601 | w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); | |
602 | w |= OMAP_I2C_CON_STP; | |
603 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); | |
604 | } | |
605 | return -EREMOTEIO; | |
606 | } | |
607 | return -EIO; | |
608 | } | |
609 | ||
610 | ||
611 | /* | |
612 | * Prepare controller for a transaction and call omap_i2c_xfer_msg | |
613 | * to do the work during IRQ processing. | |
614 | */ | |
615 | static int | |
616 | omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) | |
617 | { | |
618 | struct omap_i2c_dev *dev = i2c_get_adapdata(adap); | |
619 | int i; | |
620 | int r; | |
621 | ||
3b0fb97c S |
622 | r = pm_runtime_get_sync(dev->dev); |
623 | if (IS_ERR_VALUE(r)) | |
33ec5e81 | 624 | goto out; |
010d442c | 625 | |
c1a473bd TL |
626 | r = omap_i2c_wait_for_bb(dev); |
627 | if (r < 0) | |
010d442c KS |
628 | goto out; |
629 | ||
6a91b558 SO |
630 | if (dev->set_mpu_wkup_lat != NULL) |
631 | dev->set_mpu_wkup_lat(dev->dev, dev->latency); | |
632 | ||
010d442c KS |
633 | for (i = 0; i < num; i++) { |
634 | r = omap_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1))); | |
635 | if (r != 0) | |
636 | break; | |
637 | } | |
638 | ||
6a91b558 SO |
639 | if (dev->set_mpu_wkup_lat != NULL) |
640 | dev->set_mpu_wkup_lat(dev->dev, -1); | |
641 | ||
010d442c KS |
642 | if (r == 0) |
643 | r = num; | |
5c64eb26 MN |
644 | |
645 | omap_i2c_wait_for_bb(dev); | |
010d442c | 646 | out: |
fab67afb | 647 | pm_runtime_put(dev->dev); |
010d442c KS |
648 | return r; |
649 | } | |
650 | ||
651 | static u32 | |
652 | omap_i2c_func(struct i2c_adapter *adap) | |
653 | { | |
fb604a3d LP |
654 | return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) | |
655 | I2C_FUNC_PROTOCOL_MANGLING; | |
010d442c KS |
656 | } |
657 | ||
658 | static inline void | |
659 | omap_i2c_complete_cmd(struct omap_i2c_dev *dev, u16 err) | |
660 | { | |
661 | dev->cmd_err |= err; | |
662 | complete(&dev->cmd_complete); | |
663 | } | |
664 | ||
665 | static inline void | |
666 | omap_i2c_ack_stat(struct omap_i2c_dev *dev, u16 stat) | |
667 | { | |
668 | omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat); | |
669 | } | |
670 | ||
f3083d92 | 671 | static inline void i2c_omap_errata_i207(struct omap_i2c_dev *dev, u16 stat) |
672 | { | |
673 | /* | |
674 | * I2C Errata(Errata Nos. OMAP2: 1.67, OMAP3: 1.8) | |
675 | * Not applicable for OMAP4. | |
676 | * Under certain rare conditions, RDR could be set again | |
677 | * when the bus is busy, then ignore the interrupt and | |
678 | * clear the interrupt. | |
679 | */ | |
680 | if (stat & OMAP_I2C_STAT_RDR) { | |
681 | /* Step 1: If RDR is set, clear it */ | |
682 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR); | |
683 | ||
684 | /* Step 2: */ | |
685 | if (!(omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) | |
686 | & OMAP_I2C_STAT_BB)) { | |
687 | ||
688 | /* Step 3: */ | |
689 | if (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) | |
690 | & OMAP_I2C_STAT_RDR) { | |
691 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR); | |
692 | dev_dbg(dev->dev, "RDR when bus is busy.\n"); | |
693 | } | |
694 | ||
695 | } | |
696 | } | |
697 | } | |
698 | ||
43469d8e PW |
699 | /* rev1 devices are apparently only on some 15xx */ |
700 | #ifdef CONFIG_ARCH_OMAP15XX | |
701 | ||
010d442c | 702 | static irqreturn_t |
4e80f727 | 703 | omap_i2c_omap1_isr(int this_irq, void *dev_id) |
010d442c KS |
704 | { |
705 | struct omap_i2c_dev *dev = dev_id; | |
706 | u16 iv, w; | |
707 | ||
fab67afb | 708 | if (pm_runtime_suspended(dev->dev)) |
f08ac4e7 TL |
709 | return IRQ_NONE; |
710 | ||
010d442c KS |
711 | iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); |
712 | switch (iv) { | |
713 | case 0x00: /* None */ | |
714 | break; | |
715 | case 0x01: /* Arbitration lost */ | |
716 | dev_err(dev->dev, "Arbitration lost\n"); | |
717 | omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL); | |
718 | break; | |
719 | case 0x02: /* No acknowledgement */ | |
720 | omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK); | |
721 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_STP); | |
722 | break; | |
723 | case 0x03: /* Register access ready */ | |
724 | omap_i2c_complete_cmd(dev, 0); | |
725 | break; | |
726 | case 0x04: /* Receive data ready */ | |
727 | if (dev->buf_len) { | |
728 | w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); | |
729 | *dev->buf++ = w; | |
730 | dev->buf_len--; | |
731 | if (dev->buf_len) { | |
732 | *dev->buf++ = w >> 8; | |
733 | dev->buf_len--; | |
734 | } | |
735 | } else | |
736 | dev_err(dev->dev, "RRDY IRQ while no data requested\n"); | |
737 | break; | |
738 | case 0x05: /* Transmit data ready */ | |
739 | if (dev->buf_len) { | |
740 | w = *dev->buf++; | |
741 | dev->buf_len--; | |
742 | if (dev->buf_len) { | |
743 | w |= *dev->buf++ << 8; | |
744 | dev->buf_len--; | |
745 | } | |
746 | omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); | |
747 | } else | |
748 | dev_err(dev->dev, "XRDY IRQ while no data to send\n"); | |
749 | break; | |
750 | default: | |
751 | return IRQ_NONE; | |
752 | } | |
753 | ||
754 | return IRQ_HANDLED; | |
755 | } | |
43469d8e | 756 | #else |
4e80f727 | 757 | #define omap_i2c_omap1_isr NULL |
43469d8e | 758 | #endif |
010d442c | 759 | |
2dd151ab | 760 | /* |
c8db38f0 | 761 | * OMAP3430 Errata i462: When an XRDY/XDR is hit, wait for XUDF before writing |
2dd151ab AS |
762 | * data to DATA_REG. Otherwise some data bytes can be lost while transferring |
763 | * them from the memory to the I2C interface. | |
764 | */ | |
4151e741 | 765 | static int errata_omap3_i462(struct omap_i2c_dev *dev) |
2dd151ab | 766 | { |
e9f59b9c | 767 | unsigned long timeout = 10000; |
4151e741 | 768 | u16 stat; |
e9f59b9c | 769 | |
4151e741 FB |
770 | do { |
771 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); | |
772 | if (stat & OMAP_I2C_STAT_XUDF) | |
773 | break; | |
774 | ||
775 | if (stat & (OMAP_I2C_STAT_NACK | OMAP_I2C_STAT_AL)) { | |
540a4790 | 776 | omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_XRDY | |
2dd151ab | 777 | OMAP_I2C_STAT_XDR)); |
b07be0f3 FB |
778 | if (stat & OMAP_I2C_STAT_NACK) { |
779 | dev->cmd_err |= OMAP_I2C_STAT_NACK; | |
780 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK); | |
781 | } | |
782 | ||
783 | if (stat & OMAP_I2C_STAT_AL) { | |
784 | dev_err(dev->dev, "Arbitration lost\n"); | |
785 | dev->cmd_err |= OMAP_I2C_STAT_AL; | |
786 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK); | |
787 | } | |
788 | ||
4151e741 | 789 | return -EIO; |
2dd151ab | 790 | } |
e9f59b9c | 791 | |
2dd151ab | 792 | cpu_relax(); |
4151e741 | 793 | } while (--timeout); |
2dd151ab | 794 | |
e9f59b9c AS |
795 | if (!timeout) { |
796 | dev_err(dev->dev, "timeout waiting on XUDF bit\n"); | |
797 | return 0; | |
798 | } | |
799 | ||
2dd151ab AS |
800 | return 0; |
801 | } | |
802 | ||
3312d25e FB |
803 | static void omap_i2c_receive_data(struct omap_i2c_dev *dev, u8 num_bytes, |
804 | bool is_rdr) | |
805 | { | |
806 | u16 w; | |
807 | ||
808 | while (num_bytes--) { | |
3312d25e FB |
809 | w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); |
810 | *dev->buf++ = w; | |
811 | dev->buf_len--; | |
812 | ||
813 | /* | |
814 | * Data reg in 2430, omap3 and | |
815 | * omap4 is 8 bit wide | |
816 | */ | |
817 | if (dev->flags & OMAP_I2C_FLAG_16BIT_DATA_REG) { | |
dd74548d FB |
818 | *dev->buf++ = w >> 8; |
819 | dev->buf_len--; | |
3312d25e FB |
820 | } |
821 | } | |
822 | } | |
823 | ||
824 | static int omap_i2c_transmit_data(struct omap_i2c_dev *dev, u8 num_bytes, | |
825 | bool is_xdr) | |
826 | { | |
827 | u16 w; | |
828 | ||
829 | while (num_bytes--) { | |
3312d25e FB |
830 | w = *dev->buf++; |
831 | dev->buf_len--; | |
832 | ||
833 | /* | |
834 | * Data reg in 2430, omap3 and | |
835 | * omap4 is 8 bit wide | |
836 | */ | |
837 | if (dev->flags & OMAP_I2C_FLAG_16BIT_DATA_REG) { | |
dd74548d FB |
838 | w |= *dev->buf++ << 8; |
839 | dev->buf_len--; | |
3312d25e FB |
840 | } |
841 | ||
842 | if (dev->errata & I2C_OMAP_ERRATA_I462) { | |
843 | int ret; | |
844 | ||
845 | ret = errata_omap3_i462(dev); | |
846 | if (ret < 0) | |
847 | return ret; | |
848 | } | |
849 | ||
850 | omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); | |
851 | } | |
852 | ||
853 | return 0; | |
854 | } | |
855 | ||
010d442c | 856 | static irqreturn_t |
7d12e780 | 857 | omap_i2c_isr(int this_irq, void *dev_id) |
010d442c KS |
858 | { |
859 | struct omap_i2c_dev *dev = dev_id; | |
860 | u16 bits; | |
3312d25e | 861 | u16 stat; |
66b92988 | 862 | int err = 0, count = 0; |
010d442c | 863 | |
fab67afb | 864 | if (pm_runtime_suspended(dev->dev)) |
f08ac4e7 TL |
865 | return IRQ_NONE; |
866 | ||
66b92988 FB |
867 | do { |
868 | bits = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); | |
869 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); | |
870 | stat &= bits; | |
871 | ||
079d8af2 FB |
872 | /* If we're in receiver mode, ignore XDR/XRDY */ |
873 | if (dev->receiver) | |
874 | stat &= ~(OMAP_I2C_STAT_XDR | OMAP_I2C_STAT_XRDY); | |
875 | else | |
876 | stat &= ~(OMAP_I2C_STAT_RDR | OMAP_I2C_STAT_RRDY); | |
877 | ||
66b92988 FB |
878 | if (!stat) { |
879 | /* my work here is done */ | |
880 | return IRQ_HANDLED; | |
881 | } | |
882 | ||
010d442c KS |
883 | dev_dbg(dev->dev, "IRQ (ISR = 0x%04x)\n", stat); |
884 | if (count++ == 100) { | |
885 | dev_warn(dev->dev, "Too much work in one IRQ\n"); | |
4a7ec4ed | 886 | goto out; |
010d442c KS |
887 | } |
888 | ||
1d7afc95 | 889 | if (stat & OMAP_I2C_STAT_NACK) { |
b6ee52c3 | 890 | err |= OMAP_I2C_STAT_NACK; |
1d7afc95 | 891 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK); |
4a7ec4ed | 892 | goto out; |
1d7afc95 | 893 | } |
78e1cf42 | 894 | |
b6ee52c3 NM |
895 | if (stat & OMAP_I2C_STAT_AL) { |
896 | dev_err(dev->dev, "Arbitration lost\n"); | |
897 | err |= OMAP_I2C_STAT_AL; | |
1d7afc95 | 898 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_AL); |
4a7ec4ed | 899 | goto out; |
b6ee52c3 | 900 | } |
c55edb99 | 901 | |
a5a595cc | 902 | /* |
cb527ede | 903 | * ProDB0017052: Clear ARDY bit twice |
a5a595cc | 904 | */ |
b6ee52c3 | 905 | if (stat & (OMAP_I2C_STAT_ARDY | OMAP_I2C_STAT_NACK | |
04c688dd | 906 | OMAP_I2C_STAT_AL)) { |
540a4790 FB |
907 | omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_RRDY | |
908 | OMAP_I2C_STAT_RDR | | |
909 | OMAP_I2C_STAT_XRDY | | |
910 | OMAP_I2C_STAT_XDR | | |
911 | OMAP_I2C_STAT_ARDY)); | |
4a7ec4ed | 912 | goto out; |
04c688dd | 913 | } |
c55edb99 | 914 | |
6d9939f6 | 915 | if (stat & OMAP_I2C_STAT_RDR) { |
b6ee52c3 | 916 | u8 num_bytes = 1; |
f3083d92 | 917 | |
6d9939f6 FB |
918 | if (dev->fifo_size) |
919 | num_bytes = dev->buf_len; | |
920 | ||
3312d25e | 921 | omap_i2c_receive_data(dev, num_bytes, true); |
6d9939f6 | 922 | |
f3083d92 | 923 | if (dev->errata & I2C_OMAP_ERRATA_I207) |
924 | i2c_omap_errata_i207(dev, stat); | |
925 | ||
6d9939f6 FB |
926 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR); |
927 | continue; | |
928 | } | |
929 | ||
930 | if (stat & OMAP_I2C_STAT_RRDY) { | |
931 | u8 num_bytes = 1; | |
932 | ||
dd74548d FB |
933 | if (dev->threshold) |
934 | num_bytes = dev->threshold; | |
6d9939f6 | 935 | |
3312d25e | 936 | omap_i2c_receive_data(dev, num_bytes, false); |
6d9939f6 | 937 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RRDY); |
010d442c KS |
938 | continue; |
939 | } | |
c55edb99 | 940 | |
6d9939f6 | 941 | if (stat & OMAP_I2C_STAT_XDR) { |
b6ee52c3 | 942 | u8 num_bytes = 1; |
3312d25e | 943 | int ret; |
6d9939f6 FB |
944 | |
945 | if (dev->fifo_size) | |
946 | num_bytes = dev->buf_len; | |
947 | ||
3312d25e | 948 | ret = omap_i2c_transmit_data(dev, num_bytes, true); |
3312d25e | 949 | if (ret < 0) |
b07be0f3 | 950 | goto out; |
6d9939f6 FB |
951 | |
952 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XDR); | |
953 | continue; | |
954 | } | |
955 | ||
956 | if (stat & OMAP_I2C_STAT_XRDY) { | |
957 | u8 num_bytes = 1; | |
3312d25e | 958 | int ret; |
6d9939f6 | 959 | |
dd74548d FB |
960 | if (dev->threshold) |
961 | num_bytes = dev->threshold; | |
6d9939f6 | 962 | |
3312d25e | 963 | ret = omap_i2c_transmit_data(dev, num_bytes, false); |
3312d25e | 964 | if (ret < 0) |
b07be0f3 | 965 | goto out; |
6d9939f6 FB |
966 | |
967 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XRDY); | |
010d442c KS |
968 | continue; |
969 | } | |
c55edb99 | 970 | |
010d442c KS |
971 | if (stat & OMAP_I2C_STAT_ROVR) { |
972 | dev_err(dev->dev, "Receive overrun\n"); | |
1d7afc95 FB |
973 | err |= OMAP_I2C_STAT_ROVR; |
974 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_ROVR); | |
4a7ec4ed | 975 | goto out; |
010d442c | 976 | } |
c55edb99 | 977 | |
010d442c | 978 | if (stat & OMAP_I2C_STAT_XUDF) { |
b6ee52c3 | 979 | dev_err(dev->dev, "Transmit underflow\n"); |
1d7afc95 FB |
980 | err |= OMAP_I2C_STAT_XUDF; |
981 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XUDF); | |
4a7ec4ed | 982 | goto out; |
010d442c | 983 | } |
66b92988 | 984 | } while (stat); |
010d442c | 985 | |
4a7ec4ed FB |
986 | out: |
987 | omap_i2c_complete_cmd(dev, err); | |
6a85ced2 | 988 | return IRQ_HANDLED; |
010d442c KS |
989 | } |
990 | ||
8f9082c5 | 991 | static const struct i2c_algorithm omap_i2c_algo = { |
010d442c KS |
992 | .master_xfer = omap_i2c_xfer, |
993 | .functionality = omap_i2c_func, | |
994 | }; | |
995 | ||
6145197b BC |
996 | #ifdef CONFIG_OF |
997 | static struct omap_i2c_bus_platform_data omap3_pdata = { | |
998 | .rev = OMAP_I2C_IP_VERSION_1, | |
999 | .flags = OMAP_I2C_FLAG_APPLY_ERRATA_I207 | | |
1000 | OMAP_I2C_FLAG_RESET_REGS_POSTIDLE | | |
1001 | OMAP_I2C_FLAG_BUS_SHIFT_2, | |
1002 | }; | |
1003 | ||
1004 | static struct omap_i2c_bus_platform_data omap4_pdata = { | |
1005 | .rev = OMAP_I2C_IP_VERSION_2, | |
1006 | }; | |
1007 | ||
1008 | static const struct of_device_id omap_i2c_of_match[] = { | |
1009 | { | |
1010 | .compatible = "ti,omap4-i2c", | |
1011 | .data = &omap4_pdata, | |
1012 | }, | |
1013 | { | |
1014 | .compatible = "ti,omap3-i2c", | |
1015 | .data = &omap3_pdata, | |
1016 | }, | |
1017 | { }, | |
1018 | }; | |
1019 | MODULE_DEVICE_TABLE(of, omap_i2c_of_match); | |
1020 | #endif | |
1021 | ||
1139aea9 | 1022 | static int __devinit |
010d442c KS |
1023 | omap_i2c_probe(struct platform_device *pdev) |
1024 | { | |
1025 | struct omap_i2c_dev *dev; | |
1026 | struct i2c_adapter *adap; | |
ac79e4b2 | 1027 | struct resource *mem; |
20c9d2c4 | 1028 | struct omap_i2c_bus_platform_data *pdata = pdev->dev.platform_data; |
6145197b BC |
1029 | struct device_node *node = pdev->dev.of_node; |
1030 | const struct of_device_id *match; | |
e355204e | 1031 | irq_handler_t isr; |
ac79e4b2 | 1032 | int irq; |
010d442c KS |
1033 | int r; |
1034 | ||
1035 | /* NOTE: driver uses the static register mapping */ | |
1036 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1037 | if (!mem) { | |
1038 | dev_err(&pdev->dev, "no mem resource?\n"); | |
1039 | return -ENODEV; | |
1040 | } | |
ac79e4b2 FB |
1041 | |
1042 | irq = platform_get_irq(pdev, 0); | |
1043 | if (irq < 0) { | |
010d442c | 1044 | dev_err(&pdev->dev, "no irq resource?\n"); |
ac79e4b2 | 1045 | return irq; |
010d442c KS |
1046 | } |
1047 | ||
d9ebd04d FB |
1048 | dev = devm_kzalloc(&pdev->dev, sizeof(struct omap_i2c_dev), GFP_KERNEL); |
1049 | if (!dev) { | |
1050 | dev_err(&pdev->dev, "Menory allocation failed\n"); | |
1051 | return -ENOMEM; | |
010d442c KS |
1052 | } |
1053 | ||
d9ebd04d FB |
1054 | dev->base = devm_request_and_ioremap(&pdev->dev, mem); |
1055 | if (!dev->base) { | |
1056 | dev_err(&pdev->dev, "I2C region already claimed\n"); | |
1057 | return -ENOMEM; | |
010d442c KS |
1058 | } |
1059 | ||
6c5aa407 | 1060 | match = of_match_device(of_match_ptr(omap_i2c_of_match), &pdev->dev); |
6145197b BC |
1061 | if (match) { |
1062 | u32 freq = 100000; /* default to 100000 Hz */ | |
1063 | ||
1064 | pdata = match->data; | |
1065 | dev->dtrev = pdata->rev; | |
1066 | dev->flags = pdata->flags; | |
1067 | ||
1068 | of_property_read_u32(node, "clock-frequency", &freq); | |
1069 | /* convert DT freq value in Hz into kHz for speed */ | |
1070 | dev->speed = freq / 1000; | |
1071 | } else if (pdata != NULL) { | |
1072 | dev->speed = pdata->clkrate; | |
1073 | dev->flags = pdata->flags; | |
20c9d2c4 | 1074 | dev->set_mpu_wkup_lat = pdata->set_mpu_wkup_lat; |
6145197b | 1075 | dev->dtrev = pdata->rev; |
20c9d2c4 | 1076 | } |
4574eb68 | 1077 | |
010d442c | 1078 | dev->dev = &pdev->dev; |
ac79e4b2 | 1079 | dev->irq = irq; |
55c381e4 | 1080 | |
010d442c | 1081 | platform_set_drvdata(pdev, dev); |
0e33bbb2 | 1082 | init_completion(&dev->cmd_complete); |
010d442c | 1083 | |
6145197b | 1084 | dev->reg_shift = (dev->flags >> OMAP_I2C_FLAG_BUS_SHIFT__SHIFT) & 3; |
7c6bd201 | 1085 | |
6145197b | 1086 | if (dev->dtrev == OMAP_I2C_IP_VERSION_2) |
a1295577 | 1087 | dev->regs = (u8 *)reg_map_ip_v2; |
f38e66e0 | 1088 | else |
a1295577 | 1089 | dev->regs = (u8 *)reg_map_ip_v1; |
f38e66e0 | 1090 | |
7f4b08ee | 1091 | pm_runtime_enable(dev->dev); |
3b0fb97c S |
1092 | r = pm_runtime_get_sync(dev->dev); |
1093 | if (IS_ERR_VALUE(r)) | |
1094 | goto err_free_mem; | |
010d442c | 1095 | |
9c76b878 | 1096 | dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff; |
010d442c | 1097 | |
9aa8ec67 TK |
1098 | dev->errata = 0; |
1099 | ||
1100 | if (dev->flags & OMAP_I2C_FLAG_APPLY_ERRATA_I207) | |
1101 | dev->errata |= I2C_OMAP_ERRATA_I207; | |
1102 | ||
f518b482 | 1103 | if (dev->rev <= OMAP_I2C_REV_ON_3430_3530) |
c8db38f0 | 1104 | dev->errata |= I2C_OMAP_ERRATA_I462; |
8a9d97d3 | 1105 | |
6145197b | 1106 | if (!(dev->flags & OMAP_I2C_FLAG_NO_FIFO)) { |
b6ee52c3 NM |
1107 | u16 s; |
1108 | ||
1109 | /* Set up the fifo size - Get total size */ | |
1110 | s = (omap_i2c_read_reg(dev, OMAP_I2C_BUFSTAT_REG) >> 14) & 0x3; | |
1111 | dev->fifo_size = 0x8 << s; | |
1112 | ||
1113 | /* | |
1114 | * Set up notification threshold as half the total available | |
1115 | * size. This is to ensure that we can handle the status on int | |
1116 | * call back latencies. | |
1117 | */ | |
1d5a34fe S |
1118 | |
1119 | dev->fifo_size = (dev->fifo_size / 2); | |
1120 | ||
3ff4443f | 1121 | if (dev->rev < OMAP_I2C_REV_ON_3630_4430) |
f38e66e0 | 1122 | dev->b_hw = 1; /* Enable hardware fixes */ |
1d5a34fe | 1123 | |
20c9d2c4 KJ |
1124 | /* calculate wakeup latency constraint for MPU */ |
1125 | if (dev->set_mpu_wkup_lat != NULL) | |
1126 | dev->latency = (1000000 * dev->fifo_size) / | |
6145197b | 1127 | (1000 * dev->speed / 8); |
b6ee52c3 NM |
1128 | } |
1129 | ||
010d442c KS |
1130 | /* reset ASAP, clearing any IRQs */ |
1131 | omap_i2c_init(dev); | |
1132 | ||
4e80f727 AG |
1133 | isr = (dev->rev < OMAP_I2C_OMAP1_REV_2) ? omap_i2c_omap1_isr : |
1134 | omap_i2c_isr; | |
d9ebd04d FB |
1135 | r = devm_request_irq(&pdev->dev, dev->irq, isr, IRQF_NO_SUSPEND, |
1136 | pdev->name, dev); | |
010d442c KS |
1137 | |
1138 | if (r) { | |
1139 | dev_err(dev->dev, "failure requesting irq %i\n", dev->irq); | |
1140 | goto err_unuse_clocks; | |
1141 | } | |
9c76b878 | 1142 | |
9550d4d7 | 1143 | dev_info(dev->dev, "bus %d rev%d.%d.%d at %d kHz\n", pdev->id, |
6145197b | 1144 | dev->dtrev, dev->rev >> 4, dev->rev & 0xf, dev->speed); |
010d442c KS |
1145 | |
1146 | adap = &dev->adapter; | |
1147 | i2c_set_adapdata(adap, dev); | |
1148 | adap->owner = THIS_MODULE; | |
1149 | adap->class = I2C_CLASS_HWMON; | |
783fd6fa | 1150 | strlcpy(adap->name, "OMAP I2C adapter", sizeof(adap->name)); |
010d442c KS |
1151 | adap->algo = &omap_i2c_algo; |
1152 | adap->dev.parent = &pdev->dev; | |
6145197b | 1153 | adap->dev.of_node = pdev->dev.of_node; |
010d442c KS |
1154 | |
1155 | /* i2c device drivers may be active on return from add_adapter() */ | |
7c175499 DB |
1156 | adap->nr = pdev->id; |
1157 | r = i2c_add_numbered_adapter(adap); | |
010d442c KS |
1158 | if (r) { |
1159 | dev_err(dev->dev, "failure adding adapter\n"); | |
d9ebd04d | 1160 | goto err_unuse_clocks; |
010d442c KS |
1161 | } |
1162 | ||
6145197b BC |
1163 | of_i2c_register_devices(adap); |
1164 | ||
62ff2c2b S |
1165 | pm_runtime_put(dev->dev); |
1166 | ||
010d442c KS |
1167 | return 0; |
1168 | ||
010d442c | 1169 | err_unuse_clocks: |
3e39752d | 1170 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); |
fab67afb | 1171 | pm_runtime_put(dev->dev); |
24740516 | 1172 | pm_runtime_disable(&pdev->dev); |
010d442c KS |
1173 | err_free_mem: |
1174 | platform_set_drvdata(pdev, NULL); | |
010d442c KS |
1175 | |
1176 | return r; | |
1177 | } | |
1178 | ||
d790aea7 | 1179 | static int __devexit omap_i2c_remove(struct platform_device *pdev) |
010d442c KS |
1180 | { |
1181 | struct omap_i2c_dev *dev = platform_get_drvdata(pdev); | |
3b0fb97c | 1182 | int ret; |
010d442c KS |
1183 | |
1184 | platform_set_drvdata(pdev, NULL); | |
1185 | ||
010d442c | 1186 | i2c_del_adapter(&dev->adapter); |
3b0fb97c S |
1187 | ret = pm_runtime_get_sync(&pdev->dev); |
1188 | if (IS_ERR_VALUE(ret)) | |
1189 | return ret; | |
1190 | ||
010d442c | 1191 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); |
0861f430 | 1192 | pm_runtime_put(&pdev->dev); |
24740516 | 1193 | pm_runtime_disable(&pdev->dev); |
010d442c KS |
1194 | return 0; |
1195 | } | |
1196 | ||
5692d2a2 | 1197 | #ifdef CONFIG_PM |
fab67afb KH |
1198 | #ifdef CONFIG_PM_RUNTIME |
1199 | static int omap_i2c_runtime_suspend(struct device *dev) | |
1200 | { | |
1201 | struct platform_device *pdev = to_platform_device(dev); | |
1202 | struct omap_i2c_dev *_dev = platform_get_drvdata(pdev); | |
3dae3efb S |
1203 | u16 iv; |
1204 | ||
1205 | _dev->iestate = omap_i2c_read_reg(_dev, OMAP_I2C_IE_REG); | |
bd16c82f S |
1206 | |
1207 | omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, 0); | |
fab67afb | 1208 | |
3dae3efb S |
1209 | if (_dev->rev < OMAP_I2C_OMAP1_REV_2) { |
1210 | iv = omap_i2c_read_reg(_dev, OMAP_I2C_IV_REG); /* Read clears */ | |
1211 | } else { | |
1212 | omap_i2c_write_reg(_dev, OMAP_I2C_STAT_REG, _dev->iestate); | |
fab67afb | 1213 | |
3dae3efb S |
1214 | /* Flush posted write */ |
1215 | omap_i2c_read_reg(_dev, OMAP_I2C_STAT_REG); | |
1216 | } | |
fab67afb KH |
1217 | |
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | static int omap_i2c_runtime_resume(struct device *dev) | |
1222 | { | |
1223 | struct platform_device *pdev = to_platform_device(dev); | |
1224 | struct omap_i2c_dev *_dev = platform_get_drvdata(pdev); | |
1225 | ||
3dae3efb S |
1226 | if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) { |
1227 | omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, 0); | |
1228 | omap_i2c_write_reg(_dev, OMAP_I2C_PSC_REG, _dev->pscstate); | |
1229 | omap_i2c_write_reg(_dev, OMAP_I2C_SCLL_REG, _dev->scllstate); | |
1230 | omap_i2c_write_reg(_dev, OMAP_I2C_SCLH_REG, _dev->sclhstate); | |
1231 | omap_i2c_write_reg(_dev, OMAP_I2C_BUF_REG, _dev->bufstate); | |
1232 | omap_i2c_write_reg(_dev, OMAP_I2C_SYSC_REG, _dev->syscstate); | |
1233 | omap_i2c_write_reg(_dev, OMAP_I2C_WE_REG, _dev->westate); | |
1234 | omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); | |
1235 | } | |
1236 | ||
1237 | /* | |
1238 | * Don't write to this register if the IE state is 0 as it can | |
1239 | * cause deadlock. | |
1240 | */ | |
1241 | if (_dev->iestate) | |
1242 | omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, _dev->iestate); | |
fab67afb KH |
1243 | |
1244 | return 0; | |
1245 | } | |
5692d2a2 | 1246 | #endif /* CONFIG_PM_RUNTIME */ |
fab67afb KH |
1247 | |
1248 | static struct dev_pm_ops omap_i2c_pm_ops = { | |
5692d2a2 S |
1249 | SET_RUNTIME_PM_OPS(omap_i2c_runtime_suspend, |
1250 | omap_i2c_runtime_resume, NULL) | |
fab67afb KH |
1251 | }; |
1252 | #define OMAP_I2C_PM_OPS (&omap_i2c_pm_ops) | |
1253 | #else | |
1254 | #define OMAP_I2C_PM_OPS NULL | |
5692d2a2 | 1255 | #endif /* CONFIG_PM */ |
fab67afb | 1256 | |
010d442c KS |
1257 | static struct platform_driver omap_i2c_driver = { |
1258 | .probe = omap_i2c_probe, | |
d790aea7 | 1259 | .remove = __devexit_p(omap_i2c_remove), |
010d442c | 1260 | .driver = { |
f7bb0d9a | 1261 | .name = "omap_i2c", |
010d442c | 1262 | .owner = THIS_MODULE, |
fab67afb | 1263 | .pm = OMAP_I2C_PM_OPS, |
6145197b | 1264 | .of_match_table = of_match_ptr(omap_i2c_of_match), |
010d442c KS |
1265 | }, |
1266 | }; | |
1267 | ||
1268 | /* I2C may be needed to bring up other drivers */ | |
1269 | static int __init | |
1270 | omap_i2c_init_driver(void) | |
1271 | { | |
1272 | return platform_driver_register(&omap_i2c_driver); | |
1273 | } | |
1274 | subsys_initcall(omap_i2c_init_driver); | |
1275 | ||
1276 | static void __exit omap_i2c_exit_driver(void) | |
1277 | { | |
1278 | platform_driver_unregister(&omap_i2c_driver); | |
1279 | } | |
1280 | module_exit(omap_i2c_exit_driver); | |
1281 | ||
1282 | MODULE_AUTHOR("MontaVista Software, Inc. (and others)"); | |
1283 | MODULE_DESCRIPTION("TI OMAP I2C bus adapter"); | |
1284 | MODULE_LICENSE("GPL"); | |
f7bb0d9a | 1285 | MODULE_ALIAS("platform:omap_i2c"); |