1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
3
4 #include <linux/acpi.h>
5 #include <linux/clk.h>
6 #include <linux/dma-mapping.h>
7 #include <linux/err.h>
8 #include <linux/i2c.h>
9 #include <linux/interrupt.h>
10 #include <linux/io.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_platform.h>
14 #include <linux/platform_device.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/qcom-geni-se.h>
17 #include <linux/spinlock.h>
18
19 #define SE_I2C_TX_TRANS_LEN 0x26c
20 #define SE_I2C_RX_TRANS_LEN 0x270
21 #define SE_I2C_SCL_COUNTERS 0x278
22
23 #define SE_I2C_ERR (M_CMD_OVERRUN_EN | M_ILLEGAL_CMD_EN | M_CMD_FAILURE_EN |\
24 M_GP_IRQ_1_EN | M_GP_IRQ_3_EN | M_GP_IRQ_4_EN)
25 #define SE_I2C_ABORT BIT(1)
26
27 /* M_CMD OP codes for I2C */
28 #define I2C_WRITE 0x1
29 #define I2C_READ 0x2
30 #define I2C_WRITE_READ 0x3
31 #define I2C_ADDR_ONLY 0x4
32 #define I2C_BUS_CLEAR 0x6
33 #define I2C_STOP_ON_BUS 0x7
34 /* M_CMD params for I2C */
35 #define PRE_CMD_DELAY BIT(0)
36 #define TIMESTAMP_BEFORE BIT(1)
37 #define STOP_STRETCH BIT(2)
38 #define TIMESTAMP_AFTER BIT(3)
39 #define POST_COMMAND_DELAY BIT(4)
40 #define IGNORE_ADD_NACK BIT(6)
41 #define READ_FINISHED_WITH_ACK BIT(7)
42 #define BYPASS_ADDR_PHASE BIT(8)
43 #define SLV_ADDR_MSK GENMASK(15, 9)
44 #define SLV_ADDR_SHFT 9
45 /* I2C SCL COUNTER fields */
46 #define HIGH_COUNTER_MSK GENMASK(29, 20)
47 #define HIGH_COUNTER_SHFT 20
48 #define LOW_COUNTER_MSK GENMASK(19, 10)
49 #define LOW_COUNTER_SHFT 10
50 #define CYCLE_COUNTER_MSK GENMASK(9, 0)
51
52 enum geni_i2c_err_code {
53 GP_IRQ0,
54 NACK,
55 GP_IRQ2,
56 BUS_PROTO,
57 ARB_LOST,
58 GP_IRQ5,
59 GENI_OVERRUN,
60 GENI_ILLEGAL_CMD,
61 GENI_ABORT_DONE,
62 GENI_TIMEOUT,
63 };
64
65 #define DM_I2C_CB_ERR ((BIT(NACK) | BIT(BUS_PROTO) | BIT(ARB_LOST)) \
66 << 5)
67
68 #define I2C_AUTO_SUSPEND_DELAY 250
69 #define KHZ(freq) (1000 * freq)
70 #define PACKING_BYTES_PW 4
71
72 #define ABORT_TIMEOUT HZ
73 #define XFER_TIMEOUT HZ
74 #define RST_TIMEOUT HZ
75
76 struct geni_i2c_dev {
77 struct geni_se se;
78 u32 tx_wm;
79 int irq;
80 int err;
81 struct i2c_adapter adap;
82 struct completion done;
83 struct i2c_msg *cur;
84 int cur_wr;
85 int cur_rd;
86 spinlock_t lock;
87 u32 clk_freq_out;
88 const struct geni_i2c_clk_fld *clk_fld;
89 int suspended;
90 };
91
92 struct geni_i2c_err_log {
93 int err;
94 const char *msg;
95 };
96
97 static const struct geni_i2c_err_log gi2c_log[] = {
98 [GP_IRQ0] = {-EIO, "Unknown I2C err GP_IRQ0"},
99 [NACK] = {-ENXIO, "NACK: slv unresponsive, check its power/reset-ln"},
100 [GP_IRQ2] = {-EIO, "Unknown I2C err GP IRQ2"},
101 [BUS_PROTO] = {-EPROTO, "Bus proto err, noisy/unepxected start/stop"},
102 [ARB_LOST] = {-EAGAIN, "Bus arbitration lost, clock line undriveable"},
103 [GP_IRQ5] = {-EIO, "Unknown I2C err GP IRQ5"},
104 [GENI_OVERRUN] = {-EIO, "Cmd overrun, check GENI cmd-state machine"},
105 [GENI_ILLEGAL_CMD] = {-EIO, "Illegal cmd, check GENI cmd-state machine"},
106 [GENI_ABORT_DONE] = {-ETIMEDOUT, "Abort after timeout successful"},
107 [GENI_TIMEOUT] = {-ETIMEDOUT, "I2C TXN timed out"},
108 };
109
110 struct geni_i2c_clk_fld {
111 u32 clk_freq_out;
112 u8 clk_div;
113 u8 t_high_cnt;
114 u8 t_low_cnt;
115 u8 t_cycle_cnt;
116 };
117
118 /*
119 * Hardware uses the underlying formula to calculate time periods of
120 * SCL clock cycle. Firmware uses some additional cycles excluded from the
121 * below formula and it is confirmed that the time periods are within
122 * specification limits.
123 *
124 * time of high period of SCL: t_high = (t_high_cnt * clk_div) / source_clock
125 * time of low period of SCL: t_low = (t_low_cnt * clk_div) / source_clock
126 * time of full period of SCL: t_cycle = (t_cycle_cnt * clk_div) / source_clock
127 * clk_freq_out = t / t_cycle
128 * source_clock = 19.2 MHz
129 */
130 static const struct geni_i2c_clk_fld geni_i2c_clk_map[] = {
131 {KHZ(100), 7, 10, 11, 26},
132 {KHZ(400), 2, 5, 12, 24},
133 {KHZ(1000), 1, 3, 9, 18},
134 };
135
geni_i2c_clk_map_idx(struct geni_i2c_dev * gi2c)136 static int geni_i2c_clk_map_idx(struct geni_i2c_dev *gi2c)
137 {
138 int i;
139 const struct geni_i2c_clk_fld *itr = geni_i2c_clk_map;
140
141 for (i = 0; i < ARRAY_SIZE(geni_i2c_clk_map); i++, itr++) {
142 if (itr->clk_freq_out == gi2c->clk_freq_out) {
143 gi2c->clk_fld = itr;
144 return 0;
145 }
146 }
147 return -EINVAL;
148 }
149
qcom_geni_i2c_conf(struct geni_i2c_dev * gi2c)150 static void qcom_geni_i2c_conf(struct geni_i2c_dev *gi2c)
151 {
152 const struct geni_i2c_clk_fld *itr = gi2c->clk_fld;
153 u32 val;
154
155 writel_relaxed(0, gi2c->se.base + SE_GENI_CLK_SEL);
156
157 val = (itr->clk_div << CLK_DIV_SHFT) | SER_CLK_EN;
158 writel_relaxed(val, gi2c->se.base + GENI_SER_M_CLK_CFG);
159
160 val = itr->t_high_cnt << HIGH_COUNTER_SHFT;
161 val |= itr->t_low_cnt << LOW_COUNTER_SHFT;
162 val |= itr->t_cycle_cnt;
163 writel_relaxed(val, gi2c->se.base + SE_I2C_SCL_COUNTERS);
164 }
165
geni_i2c_err_misc(struct geni_i2c_dev * gi2c)166 static void geni_i2c_err_misc(struct geni_i2c_dev *gi2c)
167 {
168 u32 m_cmd = readl_relaxed(gi2c->se.base + SE_GENI_M_CMD0);
169 u32 m_stat = readl_relaxed(gi2c->se.base + SE_GENI_M_IRQ_STATUS);
170 u32 geni_s = readl_relaxed(gi2c->se.base + SE_GENI_STATUS);
171 u32 geni_ios = readl_relaxed(gi2c->se.base + SE_GENI_IOS);
172 u32 dma = readl_relaxed(gi2c->se.base + SE_GENI_DMA_MODE_EN);
173 u32 rx_st, tx_st;
174
175 if (dma) {
176 rx_st = readl_relaxed(gi2c->se.base + SE_DMA_RX_IRQ_STAT);
177 tx_st = readl_relaxed(gi2c->se.base + SE_DMA_TX_IRQ_STAT);
178 } else {
179 rx_st = readl_relaxed(gi2c->se.base + SE_GENI_RX_FIFO_STATUS);
180 tx_st = readl_relaxed(gi2c->se.base + SE_GENI_TX_FIFO_STATUS);
181 }
182 dev_dbg(gi2c->se.dev, "DMA:%d tx_stat:0x%x, rx_stat:0x%x, irq-stat:0x%x\n",
183 dma, tx_st, rx_st, m_stat);
184 dev_dbg(gi2c->se.dev, "m_cmd:0x%x, geni_status:0x%x, geni_ios:0x%x\n",
185 m_cmd, geni_s, geni_ios);
186 }
187
geni_i2c_err(struct geni_i2c_dev * gi2c,int err)188 static void geni_i2c_err(struct geni_i2c_dev *gi2c, int err)
189 {
190 if (!gi2c->err)
191 gi2c->err = gi2c_log[err].err;
192 if (gi2c->cur)
193 dev_dbg(gi2c->se.dev, "len:%d, slv-addr:0x%x, RD/WR:%d\n",
194 gi2c->cur->len, gi2c->cur->addr, gi2c->cur->flags);
195
196 if (err != NACK && err != GENI_ABORT_DONE) {
197 dev_err(gi2c->se.dev, "%s\n", gi2c_log[err].msg);
198 geni_i2c_err_misc(gi2c);
199 }
200 }
201
geni_i2c_irq(int irq,void * dev)202 static irqreturn_t geni_i2c_irq(int irq, void *dev)
203 {
204 struct geni_i2c_dev *gi2c = dev;
205 void __iomem *base = gi2c->se.base;
206 int j, p;
207 u32 m_stat;
208 u32 rx_st;
209 u32 dm_tx_st;
210 u32 dm_rx_st;
211 u32 dma;
212 u32 val;
213 struct i2c_msg *cur;
214 unsigned long flags;
215
216 spin_lock_irqsave(&gi2c->lock, flags);
217 m_stat = readl_relaxed(base + SE_GENI_M_IRQ_STATUS);
218 rx_st = readl_relaxed(base + SE_GENI_RX_FIFO_STATUS);
219 dm_tx_st = readl_relaxed(base + SE_DMA_TX_IRQ_STAT);
220 dm_rx_st = readl_relaxed(base + SE_DMA_RX_IRQ_STAT);
221 dma = readl_relaxed(base + SE_GENI_DMA_MODE_EN);
222 cur = gi2c->cur;
223
224 if (!cur ||
225 m_stat & (M_CMD_FAILURE_EN | M_CMD_ABORT_EN) ||
226 dm_rx_st & (DM_I2C_CB_ERR)) {
227 if (m_stat & M_GP_IRQ_1_EN)
228 geni_i2c_err(gi2c, NACK);
229 if (m_stat & M_GP_IRQ_3_EN)
230 geni_i2c_err(gi2c, BUS_PROTO);
231 if (m_stat & M_GP_IRQ_4_EN)
232 geni_i2c_err(gi2c, ARB_LOST);
233 if (m_stat & M_CMD_OVERRUN_EN)
234 geni_i2c_err(gi2c, GENI_OVERRUN);
235 if (m_stat & M_ILLEGAL_CMD_EN)
236 geni_i2c_err(gi2c, GENI_ILLEGAL_CMD);
237 if (m_stat & M_CMD_ABORT_EN)
238 geni_i2c_err(gi2c, GENI_ABORT_DONE);
239 if (m_stat & M_GP_IRQ_0_EN)
240 geni_i2c_err(gi2c, GP_IRQ0);
241
242 /* Disable the TX Watermark interrupt to stop TX */
243 if (!dma)
244 writel_relaxed(0, base + SE_GENI_TX_WATERMARK_REG);
245 } else if (dma) {
246 dev_dbg(gi2c->se.dev, "i2c dma tx:0x%x, dma rx:0x%x\n",
247 dm_tx_st, dm_rx_st);
248 } else if (cur->flags & I2C_M_RD &&
249 m_stat & (M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN)) {
250 u32 rxcnt = rx_st & RX_FIFO_WC_MSK;
251
252 for (j = 0; j < rxcnt; j++) {
253 p = 0;
254 val = readl_relaxed(base + SE_GENI_RX_FIFOn);
255 while (gi2c->cur_rd < cur->len && p < sizeof(val)) {
256 cur->buf[gi2c->cur_rd++] = val & 0xff;
257 val >>= 8;
258 p++;
259 }
260 if (gi2c->cur_rd == cur->len)
261 break;
262 }
263 } else if (!(cur->flags & I2C_M_RD) &&
264 m_stat & M_TX_FIFO_WATERMARK_EN) {
265 for (j = 0; j < gi2c->tx_wm; j++) {
266 u32 temp;
267
268 val = 0;
269 p = 0;
270 while (gi2c->cur_wr < cur->len && p < sizeof(val)) {
271 temp = cur->buf[gi2c->cur_wr++];
272 val |= temp << (p * 8);
273 p++;
274 }
275 writel_relaxed(val, base + SE_GENI_TX_FIFOn);
276 /* TX Complete, Disable the TX Watermark interrupt */
277 if (gi2c->cur_wr == cur->len) {
278 writel_relaxed(0, base + SE_GENI_TX_WATERMARK_REG);
279 break;
280 }
281 }
282 }
283
284 if (m_stat)
285 writel_relaxed(m_stat, base + SE_GENI_M_IRQ_CLEAR);
286
287 if (dma && dm_tx_st)
288 writel_relaxed(dm_tx_st, base + SE_DMA_TX_IRQ_CLR);
289 if (dma && dm_rx_st)
290 writel_relaxed(dm_rx_st, base + SE_DMA_RX_IRQ_CLR);
291
292 /* if this is err with done-bit not set, handle that through timeout. */
293 if (m_stat & M_CMD_DONE_EN || m_stat & M_CMD_ABORT_EN ||
294 dm_tx_st & TX_DMA_DONE || dm_tx_st & TX_RESET_DONE ||
295 dm_rx_st & RX_DMA_DONE || dm_rx_st & RX_RESET_DONE)
296 complete(&gi2c->done);
297
298 spin_unlock_irqrestore(&gi2c->lock, flags);
299
300 return IRQ_HANDLED;
301 }
302
geni_i2c_abort_xfer(struct geni_i2c_dev * gi2c)303 static void geni_i2c_abort_xfer(struct geni_i2c_dev *gi2c)
304 {
305 u32 val;
306 unsigned long time_left = ABORT_TIMEOUT;
307 unsigned long flags;
308
309 spin_lock_irqsave(&gi2c->lock, flags);
310 geni_i2c_err(gi2c, GENI_TIMEOUT);
311 gi2c->cur = NULL;
312 geni_se_abort_m_cmd(&gi2c->se);
313 spin_unlock_irqrestore(&gi2c->lock, flags);
314 do {
315 time_left = wait_for_completion_timeout(&gi2c->done, time_left);
316 val = readl_relaxed(gi2c->se.base + SE_GENI_M_IRQ_STATUS);
317 } while (!(val & M_CMD_ABORT_EN) && time_left);
318
319 if (!(val & M_CMD_ABORT_EN))
320 dev_err(gi2c->se.dev, "Timeout abort_m_cmd\n");
321 }
322
geni_i2c_rx_fsm_rst(struct geni_i2c_dev * gi2c)323 static void geni_i2c_rx_fsm_rst(struct geni_i2c_dev *gi2c)
324 {
325 u32 val;
326 unsigned long time_left = RST_TIMEOUT;
327
328 writel_relaxed(1, gi2c->se.base + SE_DMA_RX_FSM_RST);
329 do {
330 time_left = wait_for_completion_timeout(&gi2c->done, time_left);
331 val = readl_relaxed(gi2c->se.base + SE_DMA_RX_IRQ_STAT);
332 } while (!(val & RX_RESET_DONE) && time_left);
333
334 if (!(val & RX_RESET_DONE))
335 dev_err(gi2c->se.dev, "Timeout resetting RX_FSM\n");
336 }
337
geni_i2c_tx_fsm_rst(struct geni_i2c_dev * gi2c)338 static void geni_i2c_tx_fsm_rst(struct geni_i2c_dev *gi2c)
339 {
340 u32 val;
341 unsigned long time_left = RST_TIMEOUT;
342
343 writel_relaxed(1, gi2c->se.base + SE_DMA_TX_FSM_RST);
344 do {
345 time_left = wait_for_completion_timeout(&gi2c->done, time_left);
346 val = readl_relaxed(gi2c->se.base + SE_DMA_TX_IRQ_STAT);
347 } while (!(val & TX_RESET_DONE) && time_left);
348
349 if (!(val & TX_RESET_DONE))
350 dev_err(gi2c->se.dev, "Timeout resetting TX_FSM\n");
351 }
352
geni_i2c_rx_one_msg(struct geni_i2c_dev * gi2c,struct i2c_msg * msg,u32 m_param)353 static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
354 u32 m_param)
355 {
356 dma_addr_t rx_dma;
357 unsigned long time_left;
358 void *dma_buf = NULL;
359 struct geni_se *se = &gi2c->se;
360 size_t len = msg->len;
361
362 if (!of_machine_is_compatible("lenovo,yoga-c630"))
363 dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
364
365 if (dma_buf)
366 geni_se_select_mode(se, GENI_SE_DMA);
367 else
368 geni_se_select_mode(se, GENI_SE_FIFO);
369
370 writel_relaxed(len, se->base + SE_I2C_RX_TRANS_LEN);
371 geni_se_setup_m_cmd(se, I2C_READ, m_param);
372
373 if (dma_buf && geni_se_rx_dma_prep(se, dma_buf, len, &rx_dma)) {
374 geni_se_select_mode(se, GENI_SE_FIFO);
375 i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
376 dma_buf = NULL;
377 }
378
379 time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
380 if (!time_left)
381 geni_i2c_abort_xfer(gi2c);
382
383 gi2c->cur_rd = 0;
384 if (dma_buf) {
385 if (gi2c->err)
386 geni_i2c_rx_fsm_rst(gi2c);
387 geni_se_rx_dma_unprep(se, rx_dma, len);
388 i2c_put_dma_safe_msg_buf(dma_buf, msg, !gi2c->err);
389 }
390
391 return gi2c->err;
392 }
393
geni_i2c_tx_one_msg(struct geni_i2c_dev * gi2c,struct i2c_msg * msg,u32 m_param)394 static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
395 u32 m_param)
396 {
397 dma_addr_t tx_dma;
398 unsigned long time_left;
399 void *dma_buf = NULL;
400 struct geni_se *se = &gi2c->se;
401 size_t len = msg->len;
402
403 if (!of_machine_is_compatible("lenovo,yoga-c630"))
404 dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
405
406 if (dma_buf)
407 geni_se_select_mode(se, GENI_SE_DMA);
408 else
409 geni_se_select_mode(se, GENI_SE_FIFO);
410
411 writel_relaxed(len, se->base + SE_I2C_TX_TRANS_LEN);
412 geni_se_setup_m_cmd(se, I2C_WRITE, m_param);
413
414 if (dma_buf && geni_se_tx_dma_prep(se, dma_buf, len, &tx_dma)) {
415 geni_se_select_mode(se, GENI_SE_FIFO);
416 i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
417 dma_buf = NULL;
418 }
419
420 if (!dma_buf) /* Get FIFO IRQ */
421 writel_relaxed(1, se->base + SE_GENI_TX_WATERMARK_REG);
422
423 time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
424 if (!time_left)
425 geni_i2c_abort_xfer(gi2c);
426
427 gi2c->cur_wr = 0;
428 if (dma_buf) {
429 if (gi2c->err)
430 geni_i2c_tx_fsm_rst(gi2c);
431 geni_se_tx_dma_unprep(se, tx_dma, len);
432 i2c_put_dma_safe_msg_buf(dma_buf, msg, !gi2c->err);
433 }
434
435 return gi2c->err;
436 }
437
geni_i2c_xfer(struct i2c_adapter * adap,struct i2c_msg msgs[],int num)438 static int geni_i2c_xfer(struct i2c_adapter *adap,
439 struct i2c_msg msgs[],
440 int num)
441 {
442 struct geni_i2c_dev *gi2c = i2c_get_adapdata(adap);
443 int i, ret;
444
445 gi2c->err = 0;
446 reinit_completion(&gi2c->done);
447 ret = pm_runtime_get_sync(gi2c->se.dev);
448 if (ret < 0) {
449 dev_err(gi2c->se.dev, "error turning SE resources:%d\n", ret);
450 pm_runtime_put_noidle(gi2c->se.dev);
451 /* Set device in suspended since resume failed */
452 pm_runtime_set_suspended(gi2c->se.dev);
453 return ret;
454 }
455
456 qcom_geni_i2c_conf(gi2c);
457 for (i = 0; i < num; i++) {
458 u32 m_param = i < (num - 1) ? STOP_STRETCH : 0;
459
460 m_param |= ((msgs[i].addr << SLV_ADDR_SHFT) & SLV_ADDR_MSK);
461
462 gi2c->cur = &msgs[i];
463 if (msgs[i].flags & I2C_M_RD)
464 ret = geni_i2c_rx_one_msg(gi2c, &msgs[i], m_param);
465 else
466 ret = geni_i2c_tx_one_msg(gi2c, &msgs[i], m_param);
467
468 if (ret)
469 break;
470 }
471 if (ret == 0)
472 ret = num;
473
474 pm_runtime_mark_last_busy(gi2c->se.dev);
475 pm_runtime_put_autosuspend(gi2c->se.dev);
476 gi2c->cur = NULL;
477 gi2c->err = 0;
478 return ret;
479 }
480
geni_i2c_func(struct i2c_adapter * adap)481 static u32 geni_i2c_func(struct i2c_adapter *adap)
482 {
483 return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
484 }
485
486 static const struct i2c_algorithm geni_i2c_algo = {
487 .master_xfer = geni_i2c_xfer,
488 .functionality = geni_i2c_func,
489 };
490
491 #ifdef CONFIG_ACPI
492 static const struct acpi_device_id geni_i2c_acpi_match[] = {
493 { "QCOM0220"},
494 { },
495 };
496 MODULE_DEVICE_TABLE(acpi, geni_i2c_acpi_match);
497 #endif
498
geni_i2c_probe(struct platform_device * pdev)499 static int geni_i2c_probe(struct platform_device *pdev)
500 {
501 struct geni_i2c_dev *gi2c;
502 struct resource *res;
503 u32 proto, tx_depth;
504 int ret;
505
506 gi2c = devm_kzalloc(&pdev->dev, sizeof(*gi2c), GFP_KERNEL);
507 if (!gi2c)
508 return -ENOMEM;
509
510 gi2c->se.dev = &pdev->dev;
511 gi2c->se.wrapper = dev_get_drvdata(pdev->dev.parent);
512 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
513 gi2c->se.base = devm_ioremap_resource(&pdev->dev, res);
514 if (IS_ERR(gi2c->se.base))
515 return PTR_ERR(gi2c->se.base);
516
517 gi2c->se.clk = devm_clk_get(&pdev->dev, "se");
518 if (IS_ERR(gi2c->se.clk) && !has_acpi_companion(&pdev->dev)) {
519 ret = PTR_ERR(gi2c->se.clk);
520 dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret);
521 return ret;
522 }
523
524 ret = device_property_read_u32(&pdev->dev, "clock-frequency",
525 &gi2c->clk_freq_out);
526 if (ret) {
527 dev_info(&pdev->dev,
528 "Bus frequency not specified, default to 100kHz.\n");
529 gi2c->clk_freq_out = KHZ(100);
530 }
531
532 if (has_acpi_companion(&pdev->dev))
533 ACPI_COMPANION_SET(&gi2c->adap.dev, ACPI_COMPANION(&pdev->dev));
534
535 gi2c->irq = platform_get_irq(pdev, 0);
536 if (gi2c->irq < 0) {
537 dev_err(&pdev->dev, "IRQ error for i2c-geni\n");
538 return gi2c->irq;
539 }
540
541 ret = geni_i2c_clk_map_idx(gi2c);
542 if (ret) {
543 dev_err(&pdev->dev, "Invalid clk frequency %d Hz: %d\n",
544 gi2c->clk_freq_out, ret);
545 return ret;
546 }
547
548 gi2c->adap.algo = &geni_i2c_algo;
549 init_completion(&gi2c->done);
550 spin_lock_init(&gi2c->lock);
551 platform_set_drvdata(pdev, gi2c);
552 ret = devm_request_irq(&pdev->dev, gi2c->irq, geni_i2c_irq,
553 IRQF_TRIGGER_HIGH, "i2c_geni", gi2c);
554 if (ret) {
555 dev_err(&pdev->dev, "Request_irq failed:%d: err:%d\n",
556 gi2c->irq, ret);
557 return ret;
558 }
559 /* Disable the interrupt so that the system can enter low-power mode */
560 disable_irq(gi2c->irq);
561 i2c_set_adapdata(&gi2c->adap, gi2c);
562 gi2c->adap.dev.parent = &pdev->dev;
563 gi2c->adap.dev.of_node = pdev->dev.of_node;
564 strlcpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name));
565
566 ret = geni_se_resources_on(&gi2c->se);
567 if (ret) {
568 dev_err(&pdev->dev, "Error turning on resources %d\n", ret);
569 return ret;
570 }
571 proto = geni_se_read_proto(&gi2c->se);
572 tx_depth = geni_se_get_tx_fifo_depth(&gi2c->se);
573 if (proto != GENI_SE_I2C) {
574 dev_err(&pdev->dev, "Invalid proto %d\n", proto);
575 geni_se_resources_off(&gi2c->se);
576 return -ENXIO;
577 }
578 gi2c->tx_wm = tx_depth - 1;
579 geni_se_init(&gi2c->se, gi2c->tx_wm, tx_depth);
580 geni_se_config_packing(&gi2c->se, BITS_PER_BYTE, PACKING_BYTES_PW,
581 true, true, true);
582 ret = geni_se_resources_off(&gi2c->se);
583 if (ret) {
584 dev_err(&pdev->dev, "Error turning off resources %d\n", ret);
585 return ret;
586 }
587
588 dev_dbg(&pdev->dev, "i2c fifo/se-dma mode. fifo depth:%d\n", tx_depth);
589
590 gi2c->suspended = 1;
591 pm_runtime_set_suspended(gi2c->se.dev);
592 pm_runtime_set_autosuspend_delay(gi2c->se.dev, I2C_AUTO_SUSPEND_DELAY);
593 pm_runtime_use_autosuspend(gi2c->se.dev);
594 pm_runtime_enable(gi2c->se.dev);
595
596 ret = i2c_add_adapter(&gi2c->adap);
597 if (ret) {
598 dev_err(&pdev->dev, "Error adding i2c adapter %d\n", ret);
599 pm_runtime_disable(gi2c->se.dev);
600 return ret;
601 }
602
603 dev_dbg(&pdev->dev, "Geni-I2C adaptor successfully added\n");
604
605 return 0;
606 }
607
geni_i2c_remove(struct platform_device * pdev)608 static int geni_i2c_remove(struct platform_device *pdev)
609 {
610 struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev);
611
612 i2c_del_adapter(&gi2c->adap);
613 pm_runtime_disable(gi2c->se.dev);
614 return 0;
615 }
616
geni_i2c_runtime_suspend(struct device * dev)617 static int __maybe_unused geni_i2c_runtime_suspend(struct device *dev)
618 {
619 int ret;
620 struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);
621
622 disable_irq(gi2c->irq);
623 ret = geni_se_resources_off(&gi2c->se);
624 if (ret) {
625 enable_irq(gi2c->irq);
626 return ret;
627
628 } else {
629 gi2c->suspended = 1;
630 }
631
632 return 0;
633 }
634
geni_i2c_runtime_resume(struct device * dev)635 static int __maybe_unused geni_i2c_runtime_resume(struct device *dev)
636 {
637 int ret;
638 struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);
639
640 ret = geni_se_resources_on(&gi2c->se);
641 if (ret)
642 return ret;
643
644 enable_irq(gi2c->irq);
645 gi2c->suspended = 0;
646 return 0;
647 }
648
geni_i2c_suspend_noirq(struct device * dev)649 static int __maybe_unused geni_i2c_suspend_noirq(struct device *dev)
650 {
651 struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);
652
653 if (!gi2c->suspended) {
654 geni_i2c_runtime_suspend(dev);
655 pm_runtime_disable(dev);
656 pm_runtime_set_suspended(dev);
657 pm_runtime_enable(dev);
658 }
659 return 0;
660 }
661
662 static const struct dev_pm_ops geni_i2c_pm_ops = {
663 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(geni_i2c_suspend_noirq, NULL)
664 SET_RUNTIME_PM_OPS(geni_i2c_runtime_suspend, geni_i2c_runtime_resume,
665 NULL)
666 };
667
668 static const struct of_device_id geni_i2c_dt_match[] = {
669 { .compatible = "qcom,geni-i2c" },
670 {}
671 };
672 MODULE_DEVICE_TABLE(of, geni_i2c_dt_match);
673
674 static struct platform_driver geni_i2c_driver = {
675 .probe = geni_i2c_probe,
676 .remove = geni_i2c_remove,
677 .driver = {
678 .name = "geni_i2c",
679 .pm = &geni_i2c_pm_ops,
680 .of_match_table = geni_i2c_dt_match,
681 .acpi_match_table = ACPI_PTR(geni_i2c_acpi_match),
682 },
683 };
684
685 module_platform_driver(geni_i2c_driver);
686
687 MODULE_DESCRIPTION("I2C Controller Driver for GENI based QUP cores");
688 MODULE_LICENSE("GPL v2");
689
