Lines Matching refs:i2c_dev

117 static void owl_i2c_reset(struct owl_i2c_dev *i2c_dev)
119 owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,
122 owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,
126 writel(0, i2c_dev->base + OWL_I2C_REG_STAT);
129 static int owl_i2c_reset_fifo(struct owl_i2c_dev *i2c_dev)
134 owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOCTL,
140 val = readl(i2c_dev->base + OWL_I2C_REG_FIFOCTL);
147 dev_err(&i2c_dev->adap.dev, "FIFO reset timeout\n");
154 static void owl_i2c_set_freq(struct owl_i2c_dev *i2c_dev)
158 val = DIV_ROUND_UP(i2c_dev->clk_rate, i2c_dev->bus_freq * 16);
161 writel(OWL_I2C_DIV_FACTOR(val), i2c_dev->base + OWL_I2C_REG_CLKDIV);
166 struct owl_i2c_dev *i2c_dev = _dev;
167 struct i2c_msg *msg = i2c_dev->msg;
170 spin_lock(&i2c_dev->lock);
172 i2c_dev->err = 0;
175 fifostat = readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT);
177 i2c_dev->err = -ENXIO;
179 owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOSTAT,
185 stat = readl(i2c_dev->base + OWL_I2C_REG_STAT);
187 i2c_dev->err = -EIO;
189 owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_STAT,
196 while ((readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT) &
197 OWL_I2C_FIFOSTAT_RFE) && i2c_dev->msg_ptr < msg->len) {
198 msg->buf[i2c_dev->msg_ptr++] = readl(i2c_dev->base +
203 while (!(readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT) &
204 OWL_I2C_FIFOSTAT_TFF) && i2c_dev->msg_ptr < msg->len) {
205 writel(msg->buf[i2c_dev->msg_ptr++],
206 i2c_dev->base + OWL_I2C_REG_TXDAT);
212 owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_STAT,
215 complete_all(&i2c_dev->msg_complete);
216 spin_unlock(&i2c_dev->lock);
228 struct owl_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
233 while (readl(i2c_dev->base + OWL_I2C_REG_STAT) & OWL_I2C_STAT_BBB) {
246 struct owl_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
253 spin_lock_irqsave(&i2c_dev->lock, flags);
256 owl_i2c_reset(i2c_dev);
259 owl_i2c_set_freq(i2c_dev);
265 spin_unlock_irqrestore(&i2c_dev->lock, flags);
268 ret = owl_i2c_reset_fifo(i2c_dev);
277 spin_lock_irqsave(&i2c_dev->lock, flags);
280 val = readl(i2c_dev->base + OWL_I2C_REG_STAT);
283 writel(val, i2c_dev->base + OWL_I2C_REG_STAT);
288 reinit_completion(&i2c_dev->msg_complete);
291 owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,
309 writel(addr, i2c_dev->base + OWL_I2C_REG_TXDAT);
314 i2c_dev->base + OWL_I2C_REG_TXDAT);
323 i2c_dev->msg = msg;
324 i2c_dev->msg_ptr = 0;
327 writel(msg->len, i2c_dev->base + OWL_I2C_REG_DATCNT);
330 writel(addr, i2c_dev->base + OWL_I2C_REG_TXDAT);
336 if (readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT) &
341 i2c_dev->base + OWL_I2C_REG_TXDAT);
344 i2c_dev->msg_ptr = idx;
349 owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOCTL,
352 owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOCTL,
356 writel(i2c_cmd, i2c_dev->base + OWL_I2C_REG_CMD);
358 spin_unlock_irqrestore(&i2c_dev->lock, flags);
360 time_left = wait_for_completion_timeout(&i2c_dev->msg_complete,
363 spin_lock_irqsave(&i2c_dev->lock, flags);
367 owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,
374 ret = i2c_dev->err < 0 ? i2c_dev->err : num;
377 spin_unlock_irqrestore(&i2c_dev->lock, flags);
381 owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_CTL,
403 struct owl_i2c_dev *i2c_dev;
406 i2c_dev = devm_kzalloc(dev, sizeof(*i2c_dev), GFP_KERNEL);
407 if (!i2c_dev)
410 i2c_dev->base = devm_platform_ioremap_resource(pdev, 0);
411 if (IS_ERR(i2c_dev->base))
412 return PTR_ERR(i2c_dev->base);
419 &i2c_dev->bus_freq))
420 i2c_dev->bus_freq = I2C_MAX_STANDARD_MODE_FREQ;
423 if (i2c_dev->bus_freq != I2C_MAX_STANDARD_MODE_FREQ &&
424 i2c_dev->bus_freq != I2C_MAX_FAST_MODE_FREQ) {
425 dev_err(dev, "invalid clock-frequency %d\n", i2c_dev->bus_freq);
429 i2c_dev->clk = devm_clk_get(dev, NULL);
430 if (IS_ERR(i2c_dev->clk)) {
432 return PTR_ERR(i2c_dev->clk);
435 ret = clk_prepare_enable(i2c_dev->clk);
439 i2c_dev->clk_rate = clk_get_rate(i2c_dev->clk);
440 if (!i2c_dev->clk_rate) {
446 init_completion(&i2c_dev->msg_complete);
447 spin_lock_init(&i2c_dev->lock);
448 i2c_dev->adap.owner = THIS_MODULE;
449 i2c_dev->adap.algo = &owl_i2c_algorithm;
450 i2c_dev->adap.timeout = OWL_I2C_TIMEOUT;
451 i2c_dev->adap.quirks = &owl_i2c_quirks;
452 i2c_dev->adap.dev.parent = dev;
453 i2c_dev->adap.dev.of_node = dev->of_node;
454 snprintf(i2c_dev->adap.name, sizeof(i2c_dev->adap.name),
456 i2c_set_adapdata(&i2c_dev->adap, i2c_dev);
458 platform_set_drvdata(pdev, i2c_dev);
461 i2c_dev);
467 return i2c_add_adapter(&i2c_dev->adap);
470 clk_disable_unprepare(i2c_dev->clk);