Lines Matching refs:lpi2c_imx
111 static void lpi2c_imx_intctrl(struct lpi2c_imx_struct *lpi2c_imx,
114 writel(enable, lpi2c_imx->base + LPI2C_MIER);
117 static int lpi2c_imx_bus_busy(struct lpi2c_imx_struct *lpi2c_imx)
123 temp = readl(lpi2c_imx->base + LPI2C_MSR);
127 writel(temp, lpi2c_imx->base + LPI2C_MSR);
135 dev_dbg(&lpi2c_imx->adapter.dev, "bus not work\n");
144 static void lpi2c_imx_set_mode(struct lpi2c_imx_struct *lpi2c_imx)
146 unsigned int bitrate = lpi2c_imx->bitrate;
160 lpi2c_imx->mode = mode;
163 static int lpi2c_imx_start(struct lpi2c_imx_struct *lpi2c_imx,
168 temp = readl(lpi2c_imx->base + LPI2C_MCR);
170 writel(temp, lpi2c_imx->base + LPI2C_MCR);
171 writel(0x7f00, lpi2c_imx->base + LPI2C_MSR);
174 writel(temp, lpi2c_imx->base + LPI2C_MTDR);
176 return lpi2c_imx_bus_busy(lpi2c_imx);
179 static void lpi2c_imx_stop(struct lpi2c_imx_struct *lpi2c_imx)
184 writel(GEN_STOP << 8, lpi2c_imx->base + LPI2C_MTDR);
187 temp = readl(lpi2c_imx->base + LPI2C_MSR);
192 dev_dbg(&lpi2c_imx->adapter.dev, "stop timeout\n");
201 static int lpi2c_imx_config(struct lpi2c_imx_struct *lpi2c_imx)
208 lpi2c_imx_set_mode(lpi2c_imx);
210 clk_rate = clk_get_rate(lpi2c_imx->clk);
211 if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
217 clk_cycle = clk_rate / ((1 << prescale) * lpi2c_imx->bitrate)
229 if (lpi2c_imx->mode == ULTRA_FAST)
235 if (lpi2c_imx->mode == ULTRA_FAST)
238 writel(temp, lpi2c_imx->base + LPI2C_MCFGR1);
242 writel(temp, lpi2c_imx->base + LPI2C_MCFGR2);
249 if (lpi2c_imx->mode == HS)
250 writel(temp, lpi2c_imx->base + LPI2C_MCCR1);
252 writel(temp, lpi2c_imx->base + LPI2C_MCCR0);
257 static int lpi2c_imx_master_enable(struct lpi2c_imx_struct *lpi2c_imx)
262 ret = pm_runtime_resume_and_get(lpi2c_imx->adapter.dev.parent);
267 writel(temp, lpi2c_imx->base + LPI2C_MCR);
268 writel(0, lpi2c_imx->base + LPI2C_MCR);
270 ret = lpi2c_imx_config(lpi2c_imx);
274 temp = readl(lpi2c_imx->base + LPI2C_MCR);
276 writel(temp, lpi2c_imx->base + LPI2C_MCR);
281 pm_runtime_mark_last_busy(lpi2c_imx->adapter.dev.parent);
282 pm_runtime_put_autosuspend(lpi2c_imx->adapter.dev.parent);
287 static int lpi2c_imx_master_disable(struct lpi2c_imx_struct *lpi2c_imx)
291 temp = readl(lpi2c_imx->base + LPI2C_MCR);
293 writel(temp, lpi2c_imx->base + LPI2C_MCR);
295 pm_runtime_mark_last_busy(lpi2c_imx->adapter.dev.parent);
296 pm_runtime_put_autosuspend(lpi2c_imx->adapter.dev.parent);
301 static int lpi2c_imx_msg_complete(struct lpi2c_imx_struct *lpi2c_imx)
305 timeout = wait_for_completion_timeout(&lpi2c_imx->complete, HZ);
310 static int lpi2c_imx_txfifo_empty(struct lpi2c_imx_struct *lpi2c_imx)
316 txcnt = readl(lpi2c_imx->base + LPI2C_MFSR) & 0xff;
318 if (readl(lpi2c_imx->base + LPI2C_MSR) & MSR_NDF) {
319 dev_dbg(&lpi2c_imx->adapter.dev, "NDF detected\n");
324 dev_dbg(&lpi2c_imx->adapter.dev, "txfifo empty timeout\n");
334 static void lpi2c_imx_set_tx_watermark(struct lpi2c_imx_struct *lpi2c_imx)
336 writel(lpi2c_imx->txfifosize >> 1, lpi2c_imx->base + LPI2C_MFCR);
339 static void lpi2c_imx_set_rx_watermark(struct lpi2c_imx_struct *lpi2c_imx)
343 remaining = lpi2c_imx->msglen - lpi2c_imx->delivered;
345 if (remaining > (lpi2c_imx->rxfifosize >> 1))
346 temp = lpi2c_imx->rxfifosize >> 1;
350 writel(temp << 16, lpi2c_imx->base + LPI2C_MFCR);
353 static void lpi2c_imx_write_txfifo(struct lpi2c_imx_struct *lpi2c_imx)
357 txcnt = readl(lpi2c_imx->base + LPI2C_MFSR) & 0xff;
359 while (txcnt < lpi2c_imx->txfifosize) {
360 if (lpi2c_imx->delivered == lpi2c_imx->msglen)
363 data = lpi2c_imx->tx_buf[lpi2c_imx->delivered++];
364 writel(data, lpi2c_imx->base + LPI2C_MTDR);
368 if (lpi2c_imx->delivered < lpi2c_imx->msglen)
369 lpi2c_imx_intctrl(lpi2c_imx, MIER_TDIE | MIER_NDIE);
371 complete(&lpi2c_imx->complete);
374 static void lpi2c_imx_read_rxfifo(struct lpi2c_imx_struct *lpi2c_imx)
380 data = readl(lpi2c_imx->base + LPI2C_MRDR);
384 lpi2c_imx->rx_buf[lpi2c_imx->delivered++] = data & 0xff;
391 if (lpi2c_imx->block_data) {
392 blocklen = lpi2c_imx->rx_buf[0];
393 lpi2c_imx->msglen += blocklen;
396 remaining = lpi2c_imx->msglen - lpi2c_imx->delivered;
399 complete(&lpi2c_imx->complete);
404 lpi2c_imx_set_rx_watermark(lpi2c_imx);
407 if (lpi2c_imx->block_data) {
408 lpi2c_imx->block_data = 0;
411 writel(temp, lpi2c_imx->base + LPI2C_MTDR);
412 } else if (!(lpi2c_imx->delivered & 0xff)) {
415 writel(temp, lpi2c_imx->base + LPI2C_MTDR);
418 lpi2c_imx_intctrl(lpi2c_imx, MIER_RDIE);
421 static void lpi2c_imx_write(struct lpi2c_imx_struct *lpi2c_imx,
424 lpi2c_imx->tx_buf = msgs->buf;
425 lpi2c_imx_set_tx_watermark(lpi2c_imx);
426 lpi2c_imx_write_txfifo(lpi2c_imx);
429 static void lpi2c_imx_read(struct lpi2c_imx_struct *lpi2c_imx,
434 lpi2c_imx->rx_buf = msgs->buf;
435 lpi2c_imx->block_data = msgs->flags & I2C_M_RECV_LEN;
437 lpi2c_imx_set_rx_watermark(lpi2c_imx);
440 writel(temp, lpi2c_imx->base + LPI2C_MTDR);
442 lpi2c_imx_intctrl(lpi2c_imx, MIER_RDIE | MIER_NDIE);
448 struct lpi2c_imx_struct *lpi2c_imx = i2c_get_adapdata(adapter);
452 result = lpi2c_imx_master_enable(lpi2c_imx);
457 result = lpi2c_imx_start(lpi2c_imx, &msgs[i]);
465 lpi2c_imx->rx_buf = NULL;
466 lpi2c_imx->tx_buf = NULL;
467 lpi2c_imx->delivered = 0;
468 lpi2c_imx->msglen = msgs[i].len;
469 init_completion(&lpi2c_imx->complete);
472 lpi2c_imx_read(lpi2c_imx, &msgs[i]);
474 lpi2c_imx_write(lpi2c_imx, &msgs[i]);
476 result = lpi2c_imx_msg_complete(lpi2c_imx);
481 result = lpi2c_imx_txfifo_empty(lpi2c_imx);
488 lpi2c_imx_stop(lpi2c_imx);
490 temp = readl(lpi2c_imx->base + LPI2C_MSR);
495 lpi2c_imx_master_disable(lpi2c_imx);
497 dev_dbg(&lpi2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__,
506 struct lpi2c_imx_struct *lpi2c_imx = dev_id;
510 enabled = readl(lpi2c_imx->base + LPI2C_MIER);
512 lpi2c_imx_intctrl(lpi2c_imx, 0);
513 temp = readl(lpi2c_imx->base + LPI2C_MSR);
517 lpi2c_imx_read_rxfifo(lpi2c_imx);
520 lpi2c_imx_write_txfifo(lpi2c_imx);
523 complete(&lpi2c_imx->complete);
547 struct lpi2c_imx_struct *lpi2c_imx;
551 lpi2c_imx = devm_kzalloc(&pdev->dev, sizeof(*lpi2c_imx), GFP_KERNEL);
552 if (!lpi2c_imx)
555 lpi2c_imx->base = devm_platform_ioremap_resource(pdev, 0);
556 if (IS_ERR(lpi2c_imx->base))
557 return PTR_ERR(lpi2c_imx->base);
563 lpi2c_imx->adapter.owner = THIS_MODULE;
564 lpi2c_imx->adapter.algo = &lpi2c_imx_algo;
565 lpi2c_imx->adapter.dev.parent = &pdev->dev;
566 lpi2c_imx->adapter.dev.of_node = pdev->dev.of_node;
567 strlcpy(lpi2c_imx->adapter.name, pdev->name,
568 sizeof(lpi2c_imx->adapter.name));
570 lpi2c_imx->clk = devm_clk_get(&pdev->dev, NULL);
571 if (IS_ERR(lpi2c_imx->clk)) {
573 return PTR_ERR(lpi2c_imx->clk);
577 "clock-frequency", &lpi2c_imx->bitrate);
579 lpi2c_imx->bitrate = I2C_MAX_STANDARD_MODE_FREQ;
582 pdev->name, lpi2c_imx);
588 i2c_set_adapdata(&lpi2c_imx->adapter, lpi2c_imx);
589 platform_set_drvdata(pdev, lpi2c_imx);
591 ret = clk_prepare_enable(lpi2c_imx->clk);
603 temp = readl(lpi2c_imx->base + LPI2C_PARAM);
604 lpi2c_imx->txfifosize = 1 << (temp & 0x0f);
605 lpi2c_imx->rxfifosize = 1 << ((temp >> 8) & 0x0f);
607 ret = i2c_add_adapter(&lpi2c_imx->adapter);
614 dev_info(&lpi2c_imx->adapter.dev, "LPI2C adapter registered\n");
628 struct lpi2c_imx_struct *lpi2c_imx = platform_get_drvdata(pdev);
630 i2c_del_adapter(&lpi2c_imx->adapter);
640 struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
642 clk_disable_unprepare(lpi2c_imx->clk);
650 struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
654 ret = clk_prepare_enable(lpi2c_imx->clk);