Lines Matching defs:i2c_dev
235 static void st_i2c_flush_rx_fifo(struct st_i2c_dev *i2c_dev)
244 if (readl_relaxed(i2c_dev->base + SSC_STA) & SSC_STA_RIR)
247 count = readl_relaxed(i2c_dev->base + SSC_RX_FSTAT) &
251 readl_relaxed(i2c_dev->base + SSC_RBUF);
254 static void st_i2c_soft_reset(struct st_i2c_dev *i2c_dev)
260 st_i2c_flush_rx_fifo(i2c_dev);
262 st_i2c_set_bits(i2c_dev->base + SSC_CTL, SSC_CTL_SR);
263 st_i2c_clr_bits(i2c_dev->base + SSC_CTL, SSC_CTL_SR);
268 * @i2c_dev: Controller's private data
270 static void st_i2c_hw_config(struct st_i2c_dev *i2c_dev)
274 struct st_i2c_timings *t = &i2c_timings[i2c_dev->mode];
276 st_i2c_soft_reset(i2c_dev);
280 writel_relaxed(val, i2c_dev->base + SSC_CLR);
284 writel_relaxed(val, i2c_dev->base + SSC_CTL);
286 rate = clk_get_rate(i2c_dev->clk);
291 writel_relaxed(val, i2c_dev->base + SSC_BRG);
294 writel_relaxed(1, i2c_dev->base + SSC_PRE_SCALER_BRG);
297 writel_relaxed(SSC_I2C_I2CM, i2c_dev->base + SSC_I2C);
301 writel_relaxed(val, i2c_dev->base + SSC_REP_START_HOLD);
305 writel_relaxed(val, i2c_dev->base + SSC_REP_START_SETUP);
309 writel_relaxed(val, i2c_dev->base + SSC_START_HOLD);
313 writel_relaxed(val, i2c_dev->base + SSC_DATA_SETUP);
317 writel_relaxed(val, i2c_dev->base + SSC_STOP_SETUP);
321 writel_relaxed(val, i2c_dev->base + SSC_BUS_FREE);
325 writel_relaxed(val, i2c_dev->base + SSC_PRSCALER);
326 writel_relaxed(val, i2c_dev->base + SSC_PRSCALER_DATAOUT);
329 val = i2c_dev->scl_min_width_us * rate / 100000000;
330 writel_relaxed(val, i2c_dev->base + SSC_NOISE_SUPP_WIDTH);
333 val = i2c_dev->sda_min_width_us * rate / 100000000;
334 writel_relaxed(val, i2c_dev->base + SSC_NOISE_SUPP_WIDTH_DATAOUT);
339 struct st_i2c_dev *i2c_dev = i2c_get_adapdata(i2c_adap);
342 dev_dbg(i2c_dev->dev, "Trying to recover bus\n");
352 writel_relaxed(0, i2c_dev->base + SSC_IEN);
354 st_i2c_hw_config(i2c_dev);
357 st_i2c_set_bits(i2c_dev->base + SSC_CTL, ctl);
359 st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_I2CM);
362 writel_relaxed(0, i2c_dev->base + SSC_TBUF);
364 st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_I2CM);
369 static int st_i2c_wait_free_bus(struct st_i2c_dev *i2c_dev)
375 sta = readl_relaxed(i2c_dev->base + SSC_STA);
382 dev_err(i2c_dev->dev, "bus not free (status = 0x%08x)\n", sta);
384 ret = i2c_recover_bus(&i2c_dev->adap);
386 dev_err(i2c_dev->dev, "Failed to recover the bus (%d)\n", ret);
395 * @i2c_dev: Controller's private data
398 static inline void st_i2c_write_tx_fifo(struct st_i2c_dev *i2c_dev, u8 byte)
402 writel_relaxed(tbuf | 1, i2c_dev->base + SSC_TBUF);
407 * @i2c_dev: Controller's private data
412 static void st_i2c_wr_fill_tx_fifo(struct st_i2c_dev *i2c_dev)
414 struct st_i2c_client *c = &i2c_dev->client;
418 sta = readl_relaxed(i2c_dev->base + SSC_STA);
422 tx_fstat = readl_relaxed(i2c_dev->base + SSC_TX_FSTAT);
431 st_i2c_write_tx_fifo(i2c_dev, *c->buf);
436 * @i2c_dev: Controller's private data
442 static void st_i2c_rd_fill_tx_fifo(struct st_i2c_dev *i2c_dev, int max)
444 struct st_i2c_client *c = &i2c_dev->client;
448 sta = readl_relaxed(i2c_dev->base + SSC_STA);
452 tx_fstat = readl_relaxed(i2c_dev->base + SSC_TX_FSTAT);
461 st_i2c_write_tx_fifo(i2c_dev, 0xff);
464 static void st_i2c_read_rx_fifo(struct st_i2c_dev *i2c_dev)
466 struct st_i2c_client *c = &i2c_dev->client;
470 sta = readl_relaxed(i2c_dev->base + SSC_STA);
474 i = readl_relaxed(i2c_dev->base + SSC_RX_FSTAT);
479 rbuf = readl_relaxed(i2c_dev->base + SSC_RBUF) >> 1;
484 dev_err(i2c_dev->dev, "Unexpected %d bytes in rx fifo\n", i);
485 st_i2c_flush_rx_fifo(i2c_dev);
491 * @i2c_dev: Controller's private data
493 static void st_i2c_terminate_xfer(struct st_i2c_dev *i2c_dev)
495 struct st_i2c_client *c = &i2c_dev->client;
497 st_i2c_clr_bits(i2c_dev->base + SSC_IEN, SSC_IEN_TEEN);
498 st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STRTG);
501 st_i2c_set_bits(i2c_dev->base + SSC_IEN, SSC_IEN_STOPEN);
502 st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STOPG);
504 st_i2c_set_bits(i2c_dev->base + SSC_IEN, SSC_IEN_REPSTRTEN);
505 st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_REPSTRTG);
511 * @i2c_dev: Controller's private data
513 static void st_i2c_handle_write(struct st_i2c_dev *i2c_dev)
515 struct st_i2c_client *c = &i2c_dev->client;
517 st_i2c_flush_rx_fifo(i2c_dev);
521 st_i2c_terminate_xfer(i2c_dev);
523 st_i2c_wr_fill_tx_fifo(i2c_dev);
528 * @i2c_dev: Controller's private data
530 static void st_i2c_handle_read(struct st_i2c_dev *i2c_dev)
532 struct st_i2c_client *c = &i2c_dev->client;
537 readl_relaxed(i2c_dev->base + SSC_RBUF);
538 st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_TXENB);
540 st_i2c_read_rx_fifo(i2c_dev);
545 st_i2c_terminate_xfer(i2c_dev);
548 st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_ACKG);
552 writel_relaxed(ien, i2c_dev->base + SSC_IEN);
554 st_i2c_rd_fill_tx_fifo(i2c_dev, c->count);
556 st_i2c_rd_fill_tx_fifo(i2c_dev, c->count - 1);
567 struct st_i2c_dev *i2c_dev = data;
568 struct st_i2c_client *c = &i2c_dev->client;
572 ien = readl_relaxed(i2c_dev->base + SSC_IEN);
573 sta = readl_relaxed(i2c_dev->base + SSC_STA);
578 dev_dbg(i2c_dev->dev, "spurious it (sta=0x%04x, ien=0x%04x)\n",
586 st_i2c_handle_read(i2c_dev);
588 st_i2c_handle_write(i2c_dev);
593 writel_relaxed(0, i2c_dev->base + SSC_IEN);
594 complete(&i2c_dev->complete);
598 writel_relaxed(SSC_CLR_NACK, i2c_dev->base + SSC_CLR);
602 st_i2c_handle_read(i2c_dev);
607 writel_relaxed(it, i2c_dev->base + SSC_IEN);
609 st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STOPG);
614 writel_relaxed(SSC_CLR_SSCARBL, i2c_dev->base + SSC_CLR);
617 writel_relaxed(it, i2c_dev->base + SSC_IEN);
619 st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STOPG);
624 dev_err(i2c_dev->dev,
633 readl(i2c_dev->base + SSC_IEN);
640 * @i2c_dev: Controller's private data
645 static int st_i2c_xfer_msg(struct st_i2c_dev *i2c_dev, struct i2c_msg *msg,
648 struct st_i2c_client *c = &i2c_dev->client;
660 reinit_completion(&i2c_dev->complete);
663 st_i2c_set_bits(i2c_dev->base + SSC_CTL, ctl);
668 st_i2c_set_bits(i2c_dev->base + SSC_I2C, i2c);
671 st_i2c_write_tx_fifo(i2c_dev, c->addr);
675 st_i2c_wr_fill_tx_fifo(i2c_dev);
678 writel_relaxed(it, i2c_dev->base + SSC_IEN);
681 ret = st_i2c_wait_free_bus(i2c_dev);
685 st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STRTG);
688 timeout = wait_for_completion_timeout(&i2c_dev->complete,
689 i2c_dev->adap.timeout);
693 dev_err(i2c_dev->dev, "Write to slave 0x%x timed out\n",
699 st_i2c_clr_bits(i2c_dev->base + SSC_I2C, i2c);
702 i2c_dev->base + SSC_CLR);
716 struct st_i2c_dev *i2c_dev = i2c_get_adapdata(i2c_adap);
719 i2c_dev->busy = true;
721 ret = clk_prepare_enable(i2c_dev->clk);
723 dev_err(i2c_dev->dev, "Failed to prepare_enable clock\n");
727 pinctrl_pm_select_default_state(i2c_dev->dev);
729 st_i2c_hw_config(i2c_dev);
732 ret = st_i2c_xfer_msg(i2c_dev, &msgs[i], i == 0, i == num - 1);
734 pinctrl_pm_select_idle_state(i2c_dev->dev);
736 clk_disable_unprepare(i2c_dev->clk);
738 i2c_dev->busy = false;
745 struct st_i2c_dev *i2c_dev = dev_get_drvdata(dev);
747 if (i2c_dev->busy)
781 struct st_i2c_dev *i2c_dev)
786 &i2c_dev->scl_min_width_us);
788 dev_err(i2c_dev->dev, "st,i2c-min-scl-pulse-width-us invalid\n");
793 &i2c_dev->sda_min_width_us);
795 dev_err(i2c_dev->dev, "st,i2c-min-sda-pulse-width-us invalid\n");
805 struct st_i2c_dev *i2c_dev;
811 i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
812 if (!i2c_dev)
815 i2c_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
816 if (IS_ERR(i2c_dev->base))
817 return PTR_ERR(i2c_dev->base);
819 i2c_dev->irq = irq_of_parse_and_map(np, 0);
820 if (!i2c_dev->irq) {
825 i2c_dev->clk = of_clk_get_by_name(np, "ssc");
826 if (IS_ERR(i2c_dev->clk)) {
828 return PTR_ERR(i2c_dev->clk);
831 i2c_dev->mode = I2C_MODE_STANDARD;
834 i2c_dev->mode = I2C_MODE_FAST;
836 i2c_dev->dev = &pdev->dev;
838 ret = devm_request_threaded_irq(&pdev->dev, i2c_dev->irq,
840 IRQF_ONESHOT, pdev->name, i2c_dev);
842 dev_err(&pdev->dev, "Failed to request irq %i\n", i2c_dev->irq);
846 pinctrl_pm_select_default_state(i2c_dev->dev);
848 pinctrl_pm_select_idle_state(i2c_dev->dev);
850 ret = st_i2c_of_get_deglitch(np, i2c_dev);
854 adap = &i2c_dev->adap;
855 i2c_set_adapdata(adap, i2c_dev);
865 init_completion(&i2c_dev->complete);
871 platform_set_drvdata(pdev, i2c_dev);
873 dev_info(i2c_dev->dev, "%s initialized\n", adap->name);
880 struct st_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
882 i2c_del_adapter(&i2c_dev->adap);