Lines Matching refs:i2c_dev
94 static void sprd_i2c_set_count(struct sprd_i2c *i2c_dev, u32 count)
96 writel(count, i2c_dev->base + I2C_COUNT);
99 static void sprd_i2c_send_stop(struct sprd_i2c *i2c_dev, int stop)
101 u32 tmp = readl(i2c_dev->base + I2C_CTL);
104 writel(tmp & ~STP_EN, i2c_dev->base + I2C_CTL);
106 writel(tmp | STP_EN, i2c_dev->base + I2C_CTL);
109 static void sprd_i2c_clear_start(struct sprd_i2c *i2c_dev)
111 u32 tmp = readl(i2c_dev->base + I2C_CTL);
113 writel(tmp & ~I2C_START, i2c_dev->base + I2C_CTL);
116 static void sprd_i2c_clear_ack(struct sprd_i2c *i2c_dev)
118 u32 tmp = readl(i2c_dev->base + I2C_STATUS);
120 writel(tmp & ~I2C_RX_ACK, i2c_dev->base + I2C_STATUS);
123 static void sprd_i2c_clear_irq(struct sprd_i2c *i2c_dev)
125 u32 tmp = readl(i2c_dev->base + I2C_STATUS);
127 writel(tmp & ~I2C_INT, i2c_dev->base + I2C_STATUS);
130 static void sprd_i2c_reset_fifo(struct sprd_i2c *i2c_dev)
132 writel(I2C_RST, i2c_dev->base + ADDR_RST);
135 static void sprd_i2c_set_devaddr(struct sprd_i2c *i2c_dev, struct i2c_msg *m)
137 writel(m->addr << 1, i2c_dev->base + I2C_ADDR_CFG);
140 static void sprd_i2c_write_bytes(struct sprd_i2c *i2c_dev, u8 *buf, u32 len)
145 writeb(buf[i], i2c_dev->base + I2C_TX);
148 static void sprd_i2c_read_bytes(struct sprd_i2c *i2c_dev, u8 *buf, u32 len)
153 buf[i] = readb(i2c_dev->base + I2C_RX);
156 static void sprd_i2c_set_full_thld(struct sprd_i2c *i2c_dev, u32 full_thld)
158 u32 tmp = readl(i2c_dev->base + I2C_CTL);
162 writel(tmp, i2c_dev->base + I2C_CTL);
165 static void sprd_i2c_set_empty_thld(struct sprd_i2c *i2c_dev, u32 empty_thld)
167 u32 tmp = readl(i2c_dev->base + I2C_CTL);
171 writel(tmp, i2c_dev->base + I2C_CTL);
174 static void sprd_i2c_set_fifo_full_int(struct sprd_i2c *i2c_dev, int enable)
176 u32 tmp = readl(i2c_dev->base + I2C_CTL);
183 writel(tmp, i2c_dev->base + I2C_CTL);
186 static void sprd_i2c_set_fifo_empty_int(struct sprd_i2c *i2c_dev, int enable)
188 u32 tmp = readl(i2c_dev->base + I2C_CTL);
195 writel(tmp, i2c_dev->base + I2C_CTL);
198 static void sprd_i2c_opt_start(struct sprd_i2c *i2c_dev)
200 u32 tmp = readl(i2c_dev->base + I2C_CTL);
202 writel(tmp | I2C_START, i2c_dev->base + I2C_CTL);
205 static void sprd_i2c_opt_mode(struct sprd_i2c *i2c_dev, int rw)
207 u32 cmd = readl(i2c_dev->base + I2C_CTL) & ~I2C_MODE;
209 writel(cmd | rw << 3, i2c_dev->base + I2C_CTL);
212 static void sprd_i2c_data_transfer(struct sprd_i2c *i2c_dev)
214 u32 i2c_count = i2c_dev->count;
216 struct i2c_msg *msg = i2c_dev->msg;
219 sprd_i2c_read_bytes(i2c_dev, i2c_dev->buf, I2C_FIFO_FULL_THLD);
220 i2c_dev->count -= I2C_FIFO_FULL_THLD;
221 i2c_dev->buf += I2C_FIFO_FULL_THLD;
228 if (i2c_dev->count >= I2C_FIFO_FULL_THLD)
229 sprd_i2c_set_fifo_full_int(i2c_dev, 1);
231 sprd_i2c_write_bytes(i2c_dev, i2c_dev->buf, need_tran);
232 i2c_dev->buf += need_tran;
233 i2c_dev->count -= need_tran;
241 sprd_i2c_set_fifo_empty_int(i2c_dev, 1);
248 struct sprd_i2c *i2c_dev = i2c_adap->algo_data;
251 i2c_dev->msg = msg;
252 i2c_dev->buf = msg->buf;
253 i2c_dev->count = msg->len;
255 reinit_completion(&i2c_dev->complete);
256 sprd_i2c_reset_fifo(i2c_dev);
257 sprd_i2c_set_devaddr(i2c_dev, msg);
258 sprd_i2c_set_count(i2c_dev, msg->len);
261 sprd_i2c_opt_mode(i2c_dev, 1);
262 sprd_i2c_send_stop(i2c_dev, 1);
264 sprd_i2c_opt_mode(i2c_dev, 0);
265 sprd_i2c_send_stop(i2c_dev, !!is_last_msg);
273 sprd_i2c_set_fifo_full_int(i2c_dev, 1);
275 sprd_i2c_data_transfer(i2c_dev);
277 sprd_i2c_opt_start(i2c_dev);
279 time_left = wait_for_completion_timeout(&i2c_dev->complete,
284 return i2c_dev->err;
290 struct sprd_i2c *i2c_dev = i2c_adap->algo_data;
293 ret = pm_runtime_resume_and_get(i2c_dev->dev);
306 pm_runtime_mark_last_busy(i2c_dev->dev);
307 pm_runtime_put_autosuspend(i2c_dev->dev);
322 static void sprd_i2c_set_clk(struct sprd_i2c *i2c_dev, u32 freq)
324 u32 apb_clk = i2c_dev->src_clk;
342 writel(div0, i2c_dev->base + ADDR_DVD0);
343 writel(div1, i2c_dev->base + ADDR_DVD1);
347 writel((6 * apb_clk) / 10000000, i2c_dev->base + ADDR_STA0_DVD);
349 writel((4 * apb_clk) / 1000000, i2c_dev->base + ADDR_STA0_DVD);
352 static void sprd_i2c_enable(struct sprd_i2c *i2c_dev)
356 writel(tmp, i2c_dev->base + I2C_CTL);
358 sprd_i2c_set_full_thld(i2c_dev, I2C_FIFO_FULL_THLD);
359 sprd_i2c_set_empty_thld(i2c_dev, I2C_FIFO_EMPTY_THLD);
361 sprd_i2c_set_clk(i2c_dev, i2c_dev->bus_freq);
362 sprd_i2c_reset_fifo(i2c_dev);
363 sprd_i2c_clear_irq(i2c_dev);
365 tmp = readl(i2c_dev->base + I2C_CTL);
366 writel(tmp | I2C_EN | I2C_INT_EN, i2c_dev->base + I2C_CTL);
371 struct sprd_i2c *i2c_dev = dev_id;
372 struct i2c_msg *msg = i2c_dev->msg;
373 bool ack = !(readl(i2c_dev->base + I2C_STATUS) & I2C_RX_ACK);
377 i2c_tran = i2c_dev->count >= I2C_FIFO_FULL_THLD;
379 i2c_tran = i2c_dev->count;
390 sprd_i2c_data_transfer(i2c_dev);
394 i2c_dev->err = 0;
401 i2c_dev->err = -EIO;
402 else if (msg->flags & I2C_M_RD && i2c_dev->count)
403 sprd_i2c_read_bytes(i2c_dev, i2c_dev->buf, i2c_dev->count);
406 sprd_i2c_clear_ack(i2c_dev);
407 sprd_i2c_clear_start(i2c_dev);
408 complete(&i2c_dev->complete);
415 struct sprd_i2c *i2c_dev = dev_id;
416 struct i2c_msg *msg = i2c_dev->msg;
417 bool ack = !(readl(i2c_dev->base + I2C_STATUS) & I2C_RX_ACK);
421 i2c_tran = i2c_dev->count >= I2C_FIFO_FULL_THLD;
423 i2c_tran = i2c_dev->count;
437 sprd_i2c_clear_start(i2c_dev);
438 sprd_i2c_clear_irq(i2c_dev);
441 sprd_i2c_set_fifo_empty_int(i2c_dev, 0);
442 sprd_i2c_set_fifo_full_int(i2c_dev, 0);
447 static int sprd_i2c_clk_init(struct sprd_i2c *i2c_dev)
451 clk_i2c = devm_clk_get(i2c_dev->dev, "i2c");
453 dev_warn(i2c_dev->dev, "i2c%d can't get the i2c clock\n",
454 i2c_dev->adap.nr);
458 clk_parent = devm_clk_get(i2c_dev->dev, "source");
460 dev_warn(i2c_dev->dev, "i2c%d can't get the source clock\n",
461 i2c_dev->adap.nr);
466 i2c_dev->src_clk = clk_get_rate(clk_i2c);
468 i2c_dev->src_clk = 26000000;
470 dev_dbg(i2c_dev->dev, "i2c%d set source clock is %d\n",
471 i2c_dev->adap.nr, i2c_dev->src_clk);
473 i2c_dev->clk = devm_clk_get(i2c_dev->dev, "enable");
474 if (IS_ERR(i2c_dev->clk)) {
475 dev_err(i2c_dev->dev, "i2c%d can't get the enable clock\n",
476 i2c_dev->adap.nr);
477 return PTR_ERR(i2c_dev->clk);
486 struct sprd_i2c *i2c_dev;
492 i2c_dev = devm_kzalloc(dev, sizeof(struct sprd_i2c), GFP_KERNEL);
493 if (!i2c_dev)
496 i2c_dev->base = devm_platform_ioremap_resource(pdev, 0);
497 if (IS_ERR(i2c_dev->base))
498 return PTR_ERR(i2c_dev->base);
500 i2c_dev->irq = platform_get_irq(pdev, 0);
501 if (i2c_dev->irq < 0)
502 return i2c_dev->irq;
504 i2c_set_adapdata(&i2c_dev->adap, i2c_dev);
505 init_completion(&i2c_dev->complete);
506 snprintf(i2c_dev->adap.name, sizeof(i2c_dev->adap.name),
509 i2c_dev->bus_freq = I2C_MAX_STANDARD_MODE_FREQ;
510 i2c_dev->adap.owner = THIS_MODULE;
511 i2c_dev->dev = dev;
512 i2c_dev->adap.retries = 3;
513 i2c_dev->adap.algo = &sprd_i2c_algo;
514 i2c_dev->adap.algo_data = i2c_dev;
515 i2c_dev->adap.dev.parent = dev;
516 i2c_dev->adap.nr = pdev->id;
517 i2c_dev->adap.dev.of_node = dev->of_node;
520 i2c_dev->bus_freq = prop;
523 if (i2c_dev->bus_freq != I2C_MAX_STANDARD_MODE_FREQ &&
524 i2c_dev->bus_freq != I2C_MAX_FAST_MODE_FREQ)
527 ret = sprd_i2c_clk_init(i2c_dev);
531 platform_set_drvdata(pdev, i2c_dev);
533 ret = clk_prepare_enable(i2c_dev->clk);
537 sprd_i2c_enable(i2c_dev);
539 pm_runtime_set_autosuspend_delay(i2c_dev->dev, SPRD_I2C_PM_TIMEOUT);
540 pm_runtime_use_autosuspend(i2c_dev->dev);
541 pm_runtime_set_active(i2c_dev->dev);
542 pm_runtime_enable(i2c_dev->dev);
544 ret = pm_runtime_get_sync(i2c_dev->dev);
548 ret = devm_request_threaded_irq(dev, i2c_dev->irq,
551 pdev->name, i2c_dev);
553 dev_err(&pdev->dev, "failed to request irq %d\n", i2c_dev->irq);
557 ret = i2c_add_numbered_adapter(&i2c_dev->adap);
563 pm_runtime_mark_last_busy(i2c_dev->dev);
564 pm_runtime_put_autosuspend(i2c_dev->dev);
568 pm_runtime_put_noidle(i2c_dev->dev);
569 pm_runtime_disable(i2c_dev->dev);
570 clk_disable_unprepare(i2c_dev->clk);
576 struct sprd_i2c *i2c_dev = platform_get_drvdata(pdev);
579 ret = pm_runtime_get_sync(i2c_dev->dev);
583 i2c_del_adapter(&i2c_dev->adap);
586 clk_disable_unprepare(i2c_dev->clk);
588 pm_runtime_put_noidle(i2c_dev->dev);
589 pm_runtime_disable(i2c_dev->dev);
596 struct sprd_i2c *i2c_dev = dev_get_drvdata(dev);
598 i2c_mark_adapter_suspended(&i2c_dev->adap);
604 struct sprd_i2c *i2c_dev = dev_get_drvdata(dev);
606 i2c_mark_adapter_resumed(&i2c_dev->adap);
612 struct sprd_i2c *i2c_dev = dev_get_drvdata(dev);
614 clk_disable_unprepare(i2c_dev->clk);
621 struct sprd_i2c *i2c_dev = dev_get_drvdata(dev);
624 ret = clk_prepare_enable(i2c_dev->clk);
628 sprd_i2c_enable(i2c_dev);