Lines Matching full:i2c
2 * Ingenic JZ4780 I2C bus driver
23 #include <linux/i2c.h>
160 static inline unsigned short jz4780_i2c_readw(struct jz4780_i2c *i2c, in jz4780_i2c_readw() argument
163 return readw(i2c->iomem + offset); in jz4780_i2c_readw()
166 static inline void jz4780_i2c_writew(struct jz4780_i2c *i2c, in jz4780_i2c_writew() argument
169 writew(val, i2c->iomem + offset); in jz4780_i2c_writew()
172 static int jz4780_i2c_disable(struct jz4780_i2c *i2c) in jz4780_i2c_disable() argument
177 jz4780_i2c_writew(i2c, JZ4780_I2C_ENB, 0); in jz4780_i2c_disable()
180 regval = jz4780_i2c_readw(i2c, JZ4780_I2C_ENSTA); in jz4780_i2c_disable()
187 dev_err(&i2c->adap.dev, "disable failed: ENSTA=0x%04x\n", regval); in jz4780_i2c_disable()
191 static int jz4780_i2c_enable(struct jz4780_i2c *i2c) in jz4780_i2c_enable() argument
196 jz4780_i2c_writew(i2c, JZ4780_I2C_ENB, 1); in jz4780_i2c_enable()
199 regval = jz4780_i2c_readw(i2c, JZ4780_I2C_ENSTA); in jz4780_i2c_enable()
206 dev_err(&i2c->adap.dev, "enable failed: ENSTA=0x%04x\n", regval); in jz4780_i2c_enable()
210 static int jz4780_i2c_set_target(struct jz4780_i2c *i2c, unsigned char address) in jz4780_i2c_set_target() argument
216 regval = jz4780_i2c_readw(i2c, JZ4780_I2C_STA); in jz4780_i2c_set_target()
225 jz4780_i2c_writew(i2c, JZ4780_I2C_TAR, address); in jz4780_i2c_set_target()
229 dev_err(&i2c->adap.dev, in jz4780_i2c_set_target()
236 static int jz4780_i2c_set_speed(struct jz4780_i2c *i2c) in jz4780_i2c_set_speed() argument
238 int dev_clk_khz = clk_get_rate(i2c->clk) / 1000; in jz4780_i2c_set_speed()
245 int i2c_clk = i2c->speed; in jz4780_i2c_set_speed()
247 if (jz4780_i2c_disable(i2c)) in jz4780_i2c_set_speed()
248 dev_dbg(&i2c->adap.dev, "i2c not disabled\n"); in jz4780_i2c_set_speed()
265 * NOTE: JZ4780_I2C_CTRL_REST can't set when i2c enabled, because in jz4780_i2c_set_speed()
266 * normal read are 2 messages, we cannot disable i2c controller in jz4780_i2c_set_speed()
274 jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp); in jz4780_i2c_set_speed()
276 jz4780_i2c_writew(i2c, JZ4780_I2C_SHCNT, in jz4780_i2c_set_speed()
278 jz4780_i2c_writew(i2c, JZ4780_I2C_SLCNT, in jz4780_i2c_set_speed()
283 jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp); in jz4780_i2c_set_speed()
285 jz4780_i2c_writew(i2c, JZ4780_I2C_FHCNT, in jz4780_i2c_set_speed()
287 jz4780_i2c_writew(i2c, JZ4780_I2C_FLCNT, in jz4780_i2c_set_speed()
292 * a i2c device must internally provide a hold time at least 300ns in jz4780_i2c_set_speed()
326 jz4780_i2c_writew(i2c, JZ4780_I2C_SDASU, setup_time); in jz4780_i2c_set_speed()
332 /*i2c hold time enable */ in jz4780_i2c_set_speed()
334 jz4780_i2c_writew(i2c, JZ4780_I2C_SDAHD, hold_time); in jz4780_i2c_set_speed()
337 jz4780_i2c_writew(i2c, JZ4780_I2C_SDAHD, 0); in jz4780_i2c_set_speed()
343 static int jz4780_i2c_cleanup(struct jz4780_i2c *i2c) in jz4780_i2c_cleanup() argument
349 spin_lock_irqsave(&i2c->lock, flags); in jz4780_i2c_cleanup()
352 tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL); in jz4780_i2c_cleanup()
354 jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp); in jz4780_i2c_cleanup()
357 jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, 0); in jz4780_i2c_cleanup()
360 jz4780_i2c_readw(i2c, JZ4780_I2C_CTXABRT); in jz4780_i2c_cleanup()
361 jz4780_i2c_readw(i2c, JZ4780_I2C_CINTR); in jz4780_i2c_cleanup()
364 tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL); in jz4780_i2c_cleanup()
366 jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp); in jz4780_i2c_cleanup()
369 jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp); in jz4780_i2c_cleanup()
371 spin_unlock_irqrestore(&i2c->lock, flags); in jz4780_i2c_cleanup()
373 ret = jz4780_i2c_disable(i2c); in jz4780_i2c_cleanup()
375 dev_err(&i2c->adap.dev, in jz4780_i2c_cleanup()
378 if (unlikely(jz4780_i2c_readw(i2c, JZ4780_I2C_INTM) in jz4780_i2c_cleanup()
379 & jz4780_i2c_readw(i2c, JZ4780_I2C_INTST))) in jz4780_i2c_cleanup()
380 dev_err(&i2c->adap.dev, in jz4780_i2c_cleanup()
386 static int jz4780_i2c_prepare(struct jz4780_i2c *i2c) in jz4780_i2c_prepare() argument
388 jz4780_i2c_set_speed(i2c); in jz4780_i2c_prepare()
389 return jz4780_i2c_enable(i2c); in jz4780_i2c_prepare()
392 static void jz4780_i2c_send_rcmd(struct jz4780_i2c *i2c, int cmd_count) in jz4780_i2c_send_rcmd() argument
397 jz4780_i2c_writew(i2c, JZ4780_I2C_DC, JZ4780_I2C_DC_READ); in jz4780_i2c_send_rcmd()
400 static void jz4780_i2c_trans_done(struct jz4780_i2c *i2c) in jz4780_i2c_trans_done() argument
402 jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, 0); in jz4780_i2c_trans_done()
403 complete(&i2c->trans_waitq); in jz4780_i2c_trans_done()
411 struct jz4780_i2c *i2c = dev_id; in jz4780_i2c_irq() local
414 spin_lock_irqsave(&i2c->lock, flags); in jz4780_i2c_irq()
415 intmsk = jz4780_i2c_readw(i2c, JZ4780_I2C_INTM); in jz4780_i2c_irq()
416 intst = jz4780_i2c_readw(i2c, JZ4780_I2C_INTST); in jz4780_i2c_irq()
421 jz4780_i2c_trans_done(i2c); in jz4780_i2c_irq()
426 dev_dbg(&i2c->adap.dev, "received fifo overflow!\n"); in jz4780_i2c_irq()
427 jz4780_i2c_trans_done(i2c); in jz4780_i2c_irq()
435 if (i2c->is_write == 0) { in jz4780_i2c_irq()
438 while ((jz4780_i2c_readw(i2c, JZ4780_I2C_STA) in jz4780_i2c_irq()
440 *(i2c->rbuf++) = jz4780_i2c_readw(i2c, JZ4780_I2C_DC) in jz4780_i2c_irq()
442 i2c->rd_data_xfered++; in jz4780_i2c_irq()
443 if (i2c->rd_data_xfered == i2c->rd_total_len) { in jz4780_i2c_irq()
444 jz4780_i2c_trans_done(i2c); in jz4780_i2c_irq()
449 rd_left = i2c->rd_total_len - i2c->rd_data_xfered; in jz4780_i2c_irq()
452 jz4780_i2c_writew(i2c, JZ4780_I2C_RXTL, rd_left - 1); in jz4780_i2c_irq()
456 if (i2c->is_write == 0) { in jz4780_i2c_irq()
457 int cmd_left = i2c->rd_total_len - i2c->rd_cmd_xfered; in jz4780_i2c_irq()
459 - (i2c->rd_cmd_xfered in jz4780_i2c_irq()
460 - i2c->rd_data_xfered); in jz4780_i2c_irq()
463 if (i2c->rd_cmd_xfered != 0) in jz4780_i2c_irq()
469 jz4780_i2c_send_rcmd(i2c, cmd_to_send); in jz4780_i2c_irq()
470 i2c->rd_cmd_xfered += cmd_to_send; in jz4780_i2c_irq()
473 cmd_left = i2c->rd_total_len - i2c->rd_cmd_xfered; in jz4780_i2c_irq()
475 intmsk = jz4780_i2c_readw(i2c, JZ4780_I2C_INTM); in jz4780_i2c_irq()
477 jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, intmsk); in jz4780_i2c_irq()
479 tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL); in jz4780_i2c_irq()
481 jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp); in jz4780_i2c_irq()
487 i2c_sta = jz4780_i2c_readw(i2c, JZ4780_I2C_STA); in jz4780_i2c_irq()
490 (i2c->wt_len > 0)) { in jz4780_i2c_irq()
491 i2c_sta = jz4780_i2c_readw(i2c, JZ4780_I2C_STA); in jz4780_i2c_irq()
492 data = *i2c->wbuf; in jz4780_i2c_irq()
494 jz4780_i2c_writew(i2c, JZ4780_I2C_DC, in jz4780_i2c_irq()
496 i2c->wbuf++; in jz4780_i2c_irq()
497 i2c->wt_len--; in jz4780_i2c_irq()
500 if (i2c->wt_len == 0) { in jz4780_i2c_irq()
501 if (!i2c->stop_hold) { in jz4780_i2c_irq()
502 tmp = jz4780_i2c_readw(i2c, in jz4780_i2c_irq()
505 jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, in jz4780_i2c_irq()
509 jz4780_i2c_trans_done(i2c); in jz4780_i2c_irq()
516 spin_unlock_irqrestore(&i2c->lock, flags); in jz4780_i2c_irq()
520 static void jz4780_i2c_txabrt(struct jz4780_i2c *i2c, int src) in jz4780_i2c_txabrt() argument
522 dev_dbg(&i2c->adap.dev, "txabrt: 0x%08x, cmd: %d, send: %d, recv: %d\n", in jz4780_i2c_txabrt()
523 src, i2c->cmd, i2c->cmd_buf[i2c->cmd], i2c->data_buf[i2c->cmd]); in jz4780_i2c_txabrt()
526 static inline int jz4780_i2c_xfer_read(struct jz4780_i2c *i2c, in jz4780_i2c_xfer_read() argument
538 spin_lock_irqsave(&i2c->lock, flags); in jz4780_i2c_xfer_read()
540 i2c->stop_hold = 0; in jz4780_i2c_xfer_read()
541 i2c->is_write = 0; in jz4780_i2c_xfer_read()
542 i2c->rbuf = buf; in jz4780_i2c_xfer_read()
543 i2c->rd_total_len = len; in jz4780_i2c_xfer_read()
544 i2c->rd_data_xfered = 0; in jz4780_i2c_xfer_read()
545 i2c->rd_cmd_xfered = 0; in jz4780_i2c_xfer_read()
548 jz4780_i2c_writew(i2c, JZ4780_I2C_RXTL, len - 1); in jz4780_i2c_xfer_read()
550 jz4780_i2c_writew(i2c, JZ4780_I2C_RXTL, RX_LEVEL); in jz4780_i2c_xfer_read()
552 jz4780_i2c_writew(i2c, JZ4780_I2C_TXTL, TX_LEVEL); in jz4780_i2c_xfer_read()
554 jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, in jz4780_i2c_xfer_read()
558 tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL); in jz4780_i2c_xfer_read()
560 jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp); in jz4780_i2c_xfer_read()
562 spin_unlock_irqrestore(&i2c->lock, flags); in jz4780_i2c_xfer_read()
564 timeout = wait_for_completion_timeout(&i2c->trans_waitq, in jz4780_i2c_xfer_read()
568 dev_err(&i2c->adap.dev, "irq read timeout\n"); in jz4780_i2c_xfer_read()
569 dev_dbg(&i2c->adap.dev, "send cmd count:%d %d\n", in jz4780_i2c_xfer_read()
570 i2c->cmd, i2c->cmd_buf[i2c->cmd]); in jz4780_i2c_xfer_read()
571 dev_dbg(&i2c->adap.dev, "receive data count:%d %d\n", in jz4780_i2c_xfer_read()
572 i2c->cmd, i2c->data_buf[i2c->cmd]); in jz4780_i2c_xfer_read()
576 tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_TXABRT); in jz4780_i2c_xfer_read()
578 jz4780_i2c_txabrt(i2c, tmp); in jz4780_i2c_xfer_read()
585 static inline int jz4780_i2c_xfer_write(struct jz4780_i2c *i2c, in jz4780_i2c_xfer_write() argument
595 spin_lock_irqsave(&i2c->lock, flags); in jz4780_i2c_xfer_write()
598 i2c->stop_hold = 1; in jz4780_i2c_xfer_write()
600 i2c->stop_hold = 0; in jz4780_i2c_xfer_write()
602 i2c->is_write = 1; in jz4780_i2c_xfer_write()
603 i2c->wbuf = buf; in jz4780_i2c_xfer_write()
604 i2c->wt_len = len; in jz4780_i2c_xfer_write()
606 jz4780_i2c_writew(i2c, JZ4780_I2C_TXTL, TX_LEVEL); in jz4780_i2c_xfer_write()
608 jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, JZ4780_I2C_INTM_MTXEMP in jz4780_i2c_xfer_write()
611 tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL); in jz4780_i2c_xfer_write()
613 jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp); in jz4780_i2c_xfer_write()
615 spin_unlock_irqrestore(&i2c->lock, flags); in jz4780_i2c_xfer_write()
617 timeout = wait_for_completion_timeout(&i2c->trans_waitq, in jz4780_i2c_xfer_write()
619 if (timeout && !i2c->stop_hold) { in jz4780_i2c_xfer_write()
625 i2c_sta = jz4780_i2c_readw(i2c, JZ4780_I2C_STA); in jz4780_i2c_xfer_write()
636 dev_err(&i2c->adap.dev, "write wait timeout\n"); in jz4780_i2c_xfer_write()
640 tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_TXABRT); in jz4780_i2c_xfer_write()
642 jz4780_i2c_txabrt(i2c, tmp); in jz4780_i2c_xfer_write()
654 struct jz4780_i2c *i2c = adap->algo_data; in jz4780_i2c_xfer() local
656 ret = jz4780_i2c_prepare(i2c); in jz4780_i2c_xfer()
658 dev_err(&i2c->adap.dev, "I2C prepare failed\n"); in jz4780_i2c_xfer()
662 if (msg->addr != jz4780_i2c_readw(i2c, JZ4780_I2C_TAR)) { in jz4780_i2c_xfer()
663 ret = jz4780_i2c_set_target(i2c, msg->addr); in jz4780_i2c_xfer()
669 ret = jz4780_i2c_xfer_read(i2c, msg->buf, msg->len, in jz4780_i2c_xfer()
672 ret = jz4780_i2c_xfer_write(i2c, msg->buf, msg->len, in jz4780_i2c_xfer()
682 jz4780_i2c_cleanup(i2c); in jz4780_i2c_xfer()
697 { .compatible = "ingenic,jz4780-i2c", },
708 struct jz4780_i2c *i2c; in jz4780_i2c_probe() local
710 i2c = devm_kzalloc(&pdev->dev, sizeof(struct jz4780_i2c), GFP_KERNEL); in jz4780_i2c_probe()
711 if (!i2c) in jz4780_i2c_probe()
714 i2c->adap.owner = THIS_MODULE; in jz4780_i2c_probe()
715 i2c->adap.algo = &jz4780_i2c_algorithm; in jz4780_i2c_probe()
716 i2c->adap.algo_data = i2c; in jz4780_i2c_probe()
717 i2c->adap.retries = 5; in jz4780_i2c_probe()
718 i2c->adap.dev.parent = &pdev->dev; in jz4780_i2c_probe()
719 i2c->adap.dev.of_node = pdev->dev.of_node; in jz4780_i2c_probe()
720 sprintf(i2c->adap.name, "%s", pdev->name); in jz4780_i2c_probe()
722 init_completion(&i2c->trans_waitq); in jz4780_i2c_probe()
723 spin_lock_init(&i2c->lock); in jz4780_i2c_probe()
726 i2c->iomem = devm_ioremap_resource(&pdev->dev, r); in jz4780_i2c_probe()
727 if (IS_ERR(i2c->iomem)) in jz4780_i2c_probe()
728 return PTR_ERR(i2c->iomem); in jz4780_i2c_probe()
730 platform_set_drvdata(pdev, i2c); in jz4780_i2c_probe()
732 i2c->clk = devm_clk_get(&pdev->dev, NULL); in jz4780_i2c_probe()
733 if (IS_ERR(i2c->clk)) in jz4780_i2c_probe()
734 return PTR_ERR(i2c->clk); in jz4780_i2c_probe()
736 ret = clk_prepare_enable(i2c->clk); in jz4780_i2c_probe()
747 i2c->speed = clk_freq / 1000; in jz4780_i2c_probe()
748 if (i2c->speed == 0) { in jz4780_i2c_probe()
753 jz4780_i2c_set_speed(i2c); in jz4780_i2c_probe()
755 dev_info(&pdev->dev, "Bus frequency is %d KHz\n", i2c->speed); in jz4780_i2c_probe()
757 tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL); in jz4780_i2c_probe()
759 jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp); in jz4780_i2c_probe()
761 jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, 0x0); in jz4780_i2c_probe()
763 i2c->irq = platform_get_irq(pdev, 0); in jz4780_i2c_probe()
764 ret = devm_request_irq(&pdev->dev, i2c->irq, jz4780_i2c_irq, 0, in jz4780_i2c_probe()
765 dev_name(&pdev->dev), i2c); in jz4780_i2c_probe()
769 ret = i2c_add_adapter(&i2c->adap); in jz4780_i2c_probe()
776 clk_disable_unprepare(i2c->clk); in jz4780_i2c_probe()
782 struct jz4780_i2c *i2c = platform_get_drvdata(pdev); in jz4780_i2c_remove() local
784 clk_disable_unprepare(i2c->clk); in jz4780_i2c_remove()
785 i2c_del_adapter(&i2c->adap); in jz4780_i2c_remove()
793 .name = "jz4780-i2c",
802 MODULE_DESCRIPTION("i2c driver for JZ4780 SoCs");