Lines Matching full:i2c
4 * I2C adapter for the PXA I2C bus access.
24 #include <linux/i2c.h>
31 #include <linux/i2c-pxa.h>
39 #include <linux/platform_data/i2c-pxa.h>
67 * I2C registers definitions
112 { "pxa2xx-i2c", REGS_PXA2XX },
114 { "ce4100-i2c", REGS_CE4100 },
115 { "pxa910-i2c", REGS_PXA910 },
116 { "armada-3700-i2c", REGS_A3700 },
122 * I2C bit definitions
216 #define _IBMR(i2c) ((i2c)->reg_ibmr) argument
217 #define _IDBR(i2c) ((i2c)->reg_idbr) argument
218 #define _ICR(i2c) ((i2c)->reg_icr) argument
219 #define _ISR(i2c) ((i2c)->reg_isr) argument
220 #define _ISAR(i2c) ((i2c)->reg_isar) argument
221 #define _ILCR(i2c) ((i2c)->reg_ilcr) argument
222 #define _IWCR(i2c) ((i2c)->reg_iwcr) argument
225 * I2C Slave mode address
298 static void i2c_pxa_show_state(struct pxa_i2c *i2c, int lno, const char *fname) in i2c_pxa_show_state() argument
300 dev_dbg(&i2c->adap.dev, "state:%s:%d: ISR=%08x, ICR=%08x, IBMR=%02x\n", fname, lno, in i2c_pxa_show_state()
301 readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c))); in i2c_pxa_show_state()
304 #define show_state(i2c) i2c_pxa_show_state(i2c, __LINE__, __func__) argument
306 static void i2c_pxa_scream_blue_murder(struct pxa_i2c *i2c, const char *why) in i2c_pxa_scream_blue_murder() argument
309 struct device *dev = &i2c->adap.dev; in i2c_pxa_scream_blue_murder()
312 i2c->req_slave_addr >> 1, why); in i2c_pxa_scream_blue_murder()
314 i2c->msg_num, i2c->msg_idx, i2c->msg_ptr); in i2c_pxa_scream_blue_murder()
316 readl(_IBMR(i2c)), readl(_IDBR(i2c)), readl(_ICR(i2c)), in i2c_pxa_scream_blue_murder()
317 readl(_ISR(i2c))); in i2c_pxa_scream_blue_murder()
319 for (i = 0; i < i2c->irqlogidx; i++) in i2c_pxa_scream_blue_murder()
320 pr_cont(" [%03x:%05x]", i2c->isrlog[i], i2c->icrlog[i]); in i2c_pxa_scream_blue_murder()
328 #define show_state(i2c) do { } while (0) argument
331 #define i2c_pxa_scream_blue_murder(i2c, why) do { } while (0) argument
335 static void i2c_pxa_master_complete(struct pxa_i2c *i2c, int ret);
338 static inline int i2c_pxa_is_slavemode(struct pxa_i2c *i2c) in i2c_pxa_is_slavemode() argument
340 return !(readl(_ICR(i2c)) & ICR_SCLE); in i2c_pxa_is_slavemode()
343 static void i2c_pxa_abort(struct pxa_i2c *i2c) in i2c_pxa_abort() argument
347 if (i2c_pxa_is_slavemode(i2c)) { in i2c_pxa_abort()
348 dev_dbg(&i2c->adap.dev, "%s: called in slave mode\n", __func__); in i2c_pxa_abort()
352 while ((i > 0) && (readl(_IBMR(i2c)) & 0x1) == 0) { in i2c_pxa_abort()
353 unsigned long icr = readl(_ICR(i2c)); in i2c_pxa_abort()
358 writel(icr, _ICR(i2c)); in i2c_pxa_abort()
360 show_state(i2c); in i2c_pxa_abort()
366 writel(readl(_ICR(i2c)) & ~(ICR_MA | ICR_START | ICR_STOP), in i2c_pxa_abort()
367 _ICR(i2c)); in i2c_pxa_abort()
370 static int i2c_pxa_wait_bus_not_busy(struct pxa_i2c *i2c) in i2c_pxa_wait_bus_not_busy() argument
374 while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB)) { in i2c_pxa_wait_bus_not_busy()
375 if ((readl(_ISR(i2c)) & ISR_SAD) != 0) in i2c_pxa_wait_bus_not_busy()
379 show_state(i2c); in i2c_pxa_wait_bus_not_busy()
383 show_state(i2c); in i2c_pxa_wait_bus_not_busy()
388 static int i2c_pxa_wait_master(struct pxa_i2c *i2c) in i2c_pxa_wait_master() argument
394 dev_dbg(&i2c->adap.dev, "%s: %ld: ISR=%08x, ICR=%08x, IBMR=%02x\n", in i2c_pxa_wait_master()
395 __func__, (long)jiffies, readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c))); in i2c_pxa_wait_master()
397 if (readl(_ISR(i2c)) & ISR_SAD) { in i2c_pxa_wait_master()
399 dev_dbg(&i2c->adap.dev, "%s: Slave detected\n", __func__); in i2c_pxa_wait_master()
404 * quick check of the i2c lines themselves to ensure they've in i2c_pxa_wait_master()
407 if ((readl(_ISR(i2c)) & (ISR_UB | ISR_IBB)) == 0 && readl(_IBMR(i2c)) == 3) { in i2c_pxa_wait_master()
409 dev_dbg(&i2c->adap.dev, "%s: done\n", __func__); in i2c_pxa_wait_master()
417 dev_dbg(&i2c->adap.dev, "%s: did not free\n", __func__); in i2c_pxa_wait_master()
422 static int i2c_pxa_set_master(struct pxa_i2c *i2c) in i2c_pxa_set_master() argument
425 dev_dbg(&i2c->adap.dev, "setting to bus master\n"); in i2c_pxa_set_master()
427 if ((readl(_ISR(i2c)) & (ISR_UB | ISR_IBB)) != 0) { in i2c_pxa_set_master()
428 dev_dbg(&i2c->adap.dev, "%s: unit is busy\n", __func__); in i2c_pxa_set_master()
429 if (!i2c_pxa_wait_master(i2c)) { in i2c_pxa_set_master()
430 dev_dbg(&i2c->adap.dev, "%s: error: unit busy\n", __func__); in i2c_pxa_set_master()
435 writel(readl(_ICR(i2c)) | ICR_SCLE, _ICR(i2c)); in i2c_pxa_set_master()
440 static int i2c_pxa_wait_slave(struct pxa_i2c *i2c) in i2c_pxa_wait_slave() argument
446 show_state(i2c); in i2c_pxa_wait_slave()
450 dev_dbg(&i2c->adap.dev, "%s: %ld: ISR=%08x, ICR=%08x, IBMR=%02x\n", in i2c_pxa_wait_slave()
451 __func__, (long)jiffies, readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c))); in i2c_pxa_wait_slave()
453 if ((readl(_ISR(i2c)) & (ISR_UB|ISR_IBB)) == 0 || in i2c_pxa_wait_slave()
454 (readl(_ISR(i2c)) & ISR_SAD) != 0 || in i2c_pxa_wait_slave()
455 (readl(_ICR(i2c)) & ICR_SCLE) == 0) { in i2c_pxa_wait_slave()
457 dev_dbg(&i2c->adap.dev, "%s: done\n", __func__); in i2c_pxa_wait_slave()
465 dev_dbg(&i2c->adap.dev, "%s: did not free\n", __func__); in i2c_pxa_wait_slave()
473 static void i2c_pxa_set_slave(struct pxa_i2c *i2c, int errcode) in i2c_pxa_set_slave() argument
475 show_state(i2c); in i2c_pxa_set_slave()
483 if (readl(_ICR(i2c)) & ICR_STOP) { in i2c_pxa_set_slave()
485 writel(readl(_ICR(i2c)) & ~ICR_STOP, _ICR(i2c)); in i2c_pxa_set_slave()
488 if (!i2c_pxa_wait_slave(i2c)) { in i2c_pxa_set_slave()
489 dev_err(&i2c->adap.dev, "%s: wait timedout\n", in i2c_pxa_set_slave()
495 writel(readl(_ICR(i2c)) & ~(ICR_STOP|ICR_ACKNAK|ICR_MA), _ICR(i2c)); in i2c_pxa_set_slave()
496 writel(readl(_ICR(i2c)) & ~ICR_SCLE, _ICR(i2c)); in i2c_pxa_set_slave()
499 dev_dbg(&i2c->adap.dev, "ICR now %08x, ISR %08x\n", readl(_ICR(i2c)), readl(_ISR(i2c))); in i2c_pxa_set_slave()
500 decode_ICR(readl(_ICR(i2c))); in i2c_pxa_set_slave()
504 #define i2c_pxa_set_slave(i2c, err) do { } while (0) argument
507 static void i2c_pxa_reset(struct pxa_i2c *i2c) in i2c_pxa_reset() argument
509 pr_debug("Resetting I2C Controller Unit\n"); in i2c_pxa_reset()
512 i2c_pxa_abort(i2c); in i2c_pxa_reset()
515 writel(ICR_UR, _ICR(i2c)); in i2c_pxa_reset()
516 writel(I2C_ISR_INIT, _ISR(i2c)); in i2c_pxa_reset()
517 writel(readl(_ICR(i2c)) & ~ICR_UR, _ICR(i2c)); in i2c_pxa_reset()
519 if (i2c->reg_isar && IS_ENABLED(CONFIG_I2C_PXA_SLAVE)) in i2c_pxa_reset()
520 writel(i2c->slave_addr, _ISAR(i2c)); in i2c_pxa_reset()
523 writel(I2C_ICR_INIT | (i2c->fast_mode ? i2c->fm_mask : 0), _ICR(i2c)); in i2c_pxa_reset()
524 writel(readl(_ICR(i2c)) | (i2c->high_mode ? i2c->hs_mask : 0), _ICR(i2c)); in i2c_pxa_reset()
527 dev_info(&i2c->adap.dev, "Enabling slave mode\n"); in i2c_pxa_reset()
528 writel(readl(_ICR(i2c)) | ICR_SADIE | ICR_ALDIE | ICR_SSDIE, _ICR(i2c)); in i2c_pxa_reset()
531 i2c_pxa_set_slave(i2c, 0); in i2c_pxa_reset()
534 writel(readl(_ICR(i2c)) | ICR_IUE, _ICR(i2c)); in i2c_pxa_reset()
541 * PXA I2C Slave mode
544 static void i2c_pxa_slave_txempty(struct pxa_i2c *i2c, u32 isr) in i2c_pxa_slave_txempty() argument
551 if (i2c->slave != NULL) in i2c_pxa_slave_txempty()
552 ret = i2c->slave->read(i2c->slave->data); in i2c_pxa_slave_txempty()
554 writel(ret, _IDBR(i2c)); in i2c_pxa_slave_txempty()
555 writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c)); /* allow next byte */ in i2c_pxa_slave_txempty()
559 static void i2c_pxa_slave_rxfull(struct pxa_i2c *i2c, u32 isr) in i2c_pxa_slave_rxfull() argument
561 unsigned int byte = readl(_IDBR(i2c)); in i2c_pxa_slave_rxfull()
563 if (i2c->slave != NULL) in i2c_pxa_slave_rxfull()
564 i2c->slave->write(i2c->slave->data, byte); in i2c_pxa_slave_rxfull()
566 writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c)); in i2c_pxa_slave_rxfull()
569 static void i2c_pxa_slave_start(struct pxa_i2c *i2c, u32 isr) in i2c_pxa_slave_start() argument
574 dev_dbg(&i2c->adap.dev, "SAD, mode is slave-%cx\n", in i2c_pxa_slave_start()
577 if (i2c->slave != NULL) in i2c_pxa_slave_start()
578 i2c->slave->event(i2c->slave->data, in i2c_pxa_slave_start()
586 writel(readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP), _ICR(i2c)); in i2c_pxa_slave_start()
587 writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c)); in i2c_pxa_slave_start()
592 if ((readl(_IBMR(i2c)) & 2) == 2) in i2c_pxa_slave_start()
598 dev_err(&i2c->adap.dev, "timeout waiting for SCL high\n"); in i2c_pxa_slave_start()
603 writel(readl(_ICR(i2c)) & ~ICR_SCLE, _ICR(i2c)); in i2c_pxa_slave_start()
606 static void i2c_pxa_slave_stop(struct pxa_i2c *i2c) in i2c_pxa_slave_stop() argument
609 dev_dbg(&i2c->adap.dev, "ISR: SSD (Slave Stop)\n"); in i2c_pxa_slave_stop()
611 if (i2c->slave != NULL) in i2c_pxa_slave_stop()
612 i2c->slave->event(i2c->slave->data, I2C_SLAVE_EVENT_STOP); in i2c_pxa_slave_stop()
615 dev_dbg(&i2c->adap.dev, "ISR: SSD (Slave Stop) acked\n"); in i2c_pxa_slave_stop()
621 if (i2c->msg) in i2c_pxa_slave_stop()
622 i2c_pxa_master_complete(i2c, I2C_RETRY); in i2c_pxa_slave_stop()
625 static void i2c_pxa_slave_txempty(struct pxa_i2c *i2c, u32 isr) in i2c_pxa_slave_txempty() argument
630 writel(0, _IDBR(i2c)); in i2c_pxa_slave_txempty()
631 writel(readl(_ICR(i2c)) | ICR_TB, _ICR(i2c)); in i2c_pxa_slave_txempty()
635 static void i2c_pxa_slave_rxfull(struct pxa_i2c *i2c, u32 isr) in i2c_pxa_slave_rxfull() argument
637 writel(readl(_ICR(i2c)) | ICR_TB | ICR_ACKNAK, _ICR(i2c)); in i2c_pxa_slave_rxfull()
640 static void i2c_pxa_slave_start(struct pxa_i2c *i2c, u32 isr) in i2c_pxa_slave_start() argument
649 writel(readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP), _ICR(i2c)); in i2c_pxa_slave_start()
650 writel(readl(_ICR(i2c)) | ICR_TB | ICR_ACKNAK, _ICR(i2c)); in i2c_pxa_slave_start()
655 if ((readl(_IBMR(i2c)) & 2) == 2) in i2c_pxa_slave_start()
661 dev_err(&i2c->adap.dev, "timeout waiting for SCL high\n"); in i2c_pxa_slave_start()
666 writel(readl(_ICR(i2c)) & ~ICR_SCLE, _ICR(i2c)); in i2c_pxa_slave_start()
669 static void i2c_pxa_slave_stop(struct pxa_i2c *i2c) in i2c_pxa_slave_stop() argument
671 if (i2c->msg) in i2c_pxa_slave_stop()
672 i2c_pxa_master_complete(i2c, I2C_RETRY); in i2c_pxa_slave_stop()
677 * PXA I2C Master mode
690 static inline void i2c_pxa_start_message(struct pxa_i2c *i2c) in i2c_pxa_start_message() argument
697 writel(i2c_pxa_addr_byte(i2c->msg), _IDBR(i2c)); in i2c_pxa_start_message()
698 i2c->req_slave_addr = i2c_pxa_addr_byte(i2c->msg); in i2c_pxa_start_message()
703 icr = readl(_ICR(i2c)) & ~(ICR_STOP | ICR_ALDIE); in i2c_pxa_start_message()
704 writel(icr | ICR_START | ICR_TB, _ICR(i2c)); in i2c_pxa_start_message()
707 static inline void i2c_pxa_stop_message(struct pxa_i2c *i2c) in i2c_pxa_stop_message() argument
712 icr = readl(_ICR(i2c)); in i2c_pxa_stop_message()
714 writel(icr, _ICR(i2c)); in i2c_pxa_stop_message()
717 static int i2c_pxa_pio_set_master(struct pxa_i2c *i2c) in i2c_pxa_pio_set_master() argument
725 while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB)) { in i2c_pxa_pio_set_master()
727 show_state(i2c); in i2c_pxa_pio_set_master()
731 show_state(i2c); in i2c_pxa_pio_set_master()
732 dev_err(&i2c->adap.dev, in i2c_pxa_pio_set_master()
740 writel(readl(_ICR(i2c)) | ICR_SCLE, _ICR(i2c)); in i2c_pxa_pio_set_master()
746 * PXA I2C send master code
751 static int i2c_pxa_send_mastercode(struct pxa_i2c *i2c) in i2c_pxa_send_mastercode() argument
756 spin_lock_irq(&i2c->lock); in i2c_pxa_send_mastercode()
757 i2c->highmode_enter = true; in i2c_pxa_send_mastercode()
758 writel(i2c->master_code, _IDBR(i2c)); in i2c_pxa_send_mastercode()
760 icr = readl(_ICR(i2c)) & ~(ICR_STOP | ICR_ALDIE); in i2c_pxa_send_mastercode()
762 writel(icr, _ICR(i2c)); in i2c_pxa_send_mastercode()
764 spin_unlock_irq(&i2c->lock); in i2c_pxa_send_mastercode()
765 timeout = wait_event_timeout(i2c->wait, in i2c_pxa_send_mastercode()
766 i2c->highmode_enter == false, HZ * 1); in i2c_pxa_send_mastercode()
768 i2c->highmode_enter = false; in i2c_pxa_send_mastercode()
773 static int i2c_pxa_do_pio_xfer(struct pxa_i2c *i2c, in i2c_pxa_do_pio_xfer() argument
779 ret = i2c_pxa_pio_set_master(i2c); in i2c_pxa_do_pio_xfer()
783 i2c->msg = msg; in i2c_pxa_do_pio_xfer()
784 i2c->msg_num = num; in i2c_pxa_do_pio_xfer()
785 i2c->msg_idx = 0; in i2c_pxa_do_pio_xfer()
786 i2c->msg_ptr = 0; in i2c_pxa_do_pio_xfer()
787 i2c->irqlogidx = 0; in i2c_pxa_do_pio_xfer()
789 i2c_pxa_start_message(i2c); in i2c_pxa_do_pio_xfer()
791 while (i2c->msg_num > 0 && --timeout) { in i2c_pxa_do_pio_xfer()
792 i2c_pxa_handler(0, i2c); in i2c_pxa_do_pio_xfer()
796 i2c_pxa_stop_message(i2c); in i2c_pxa_do_pio_xfer()
799 * We place the return code in i2c->msg_idx. in i2c_pxa_do_pio_xfer()
801 ret = i2c->msg_idx; in i2c_pxa_do_pio_xfer()
805 i2c_pxa_scream_blue_murder(i2c, "timeout"); in i2c_pxa_do_pio_xfer()
815 static int i2c_pxa_do_xfer(struct pxa_i2c *i2c, struct i2c_msg *msg, int num) in i2c_pxa_do_xfer() argument
823 ret = i2c_pxa_wait_bus_not_busy(i2c); in i2c_pxa_do_xfer()
825 dev_err(&i2c->adap.dev, "i2c_pxa: timeout waiting for bus free\n"); in i2c_pxa_do_xfer()
832 ret = i2c_pxa_set_master(i2c); in i2c_pxa_do_xfer()
834 dev_err(&i2c->adap.dev, "i2c_pxa_set_master: error %d\n", ret); in i2c_pxa_do_xfer()
838 if (i2c->high_mode) { in i2c_pxa_do_xfer()
839 ret = i2c_pxa_send_mastercode(i2c); in i2c_pxa_do_xfer()
841 dev_err(&i2c->adap.dev, "i2c_pxa_send_mastercode timeout\n"); in i2c_pxa_do_xfer()
846 spin_lock_irq(&i2c->lock); in i2c_pxa_do_xfer()
848 i2c->msg = msg; in i2c_pxa_do_xfer()
849 i2c->msg_num = num; in i2c_pxa_do_xfer()
850 i2c->msg_idx = 0; in i2c_pxa_do_xfer()
851 i2c->msg_ptr = 0; in i2c_pxa_do_xfer()
852 i2c->irqlogidx = 0; in i2c_pxa_do_xfer()
854 i2c_pxa_start_message(i2c); in i2c_pxa_do_xfer()
856 spin_unlock_irq(&i2c->lock); in i2c_pxa_do_xfer()
861 timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5); in i2c_pxa_do_xfer()
862 i2c_pxa_stop_message(i2c); in i2c_pxa_do_xfer()
865 * We place the return code in i2c->msg_idx. in i2c_pxa_do_xfer()
867 ret = i2c->msg_idx; in i2c_pxa_do_xfer()
869 if (!timeout && i2c->msg_num) { in i2c_pxa_do_xfer()
870 i2c_pxa_scream_blue_murder(i2c, "timeout"); in i2c_pxa_do_xfer()
881 struct pxa_i2c *i2c = adap->algo_data; in i2c_pxa_pio_xfer() local
884 /* If the I2C controller is disabled we need to reset it in i2c_pxa_pio_xfer()
888 if (!(readl(_ICR(i2c)) & ICR_IUE)) in i2c_pxa_pio_xfer()
889 i2c_pxa_reset(i2c); in i2c_pxa_pio_xfer()
892 ret = i2c_pxa_do_pio_xfer(i2c, msgs, num); in i2c_pxa_pio_xfer()
900 i2c_pxa_scream_blue_murder(i2c, "exhausted retries"); in i2c_pxa_pio_xfer()
903 i2c_pxa_set_slave(i2c, ret); in i2c_pxa_pio_xfer()
910 static void i2c_pxa_master_complete(struct pxa_i2c *i2c, int ret) in i2c_pxa_master_complete() argument
912 i2c->msg_ptr = 0; in i2c_pxa_master_complete()
913 i2c->msg = NULL; in i2c_pxa_master_complete()
914 i2c->msg_idx ++; in i2c_pxa_master_complete()
915 i2c->msg_num = 0; in i2c_pxa_master_complete()
917 i2c->msg_idx = ret; in i2c_pxa_master_complete()
918 if (!i2c->use_pio) in i2c_pxa_master_complete()
919 wake_up(&i2c->wait); in i2c_pxa_master_complete()
922 static void i2c_pxa_irq_txempty(struct pxa_i2c *i2c, u32 isr) in i2c_pxa_irq_txempty() argument
924 u32 icr = readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP|ICR_ACKNAK|ICR_TB); in i2c_pxa_irq_txempty()
935 i2c_pxa_scream_blue_murder(i2c, "ALD set"); in i2c_pxa_irq_txempty()
940 * they should, we end up causing an I2C error, which in i2c_pxa_irq_txempty()
947 (!((i2c->msg->flags & I2C_M_IGNORE_NAK) && in i2c_pxa_irq_txempty()
952 * I2C bus error - either the device NAK'd us, or in i2c_pxa_irq_txempty()
957 if (i2c->msg_ptr == 0 && i2c->msg_idx == 0) in i2c_pxa_irq_txempty()
962 i2c_pxa_master_complete(i2c, ret); in i2c_pxa_irq_txempty()
968 if (i2c->msg_ptr == i2c->msg->len - 1 && in i2c_pxa_irq_txempty()
969 i2c->msg_idx == i2c->msg_num - 1) in i2c_pxa_irq_txempty()
973 } else if (i2c->msg_ptr < i2c->msg->len) { in i2c_pxa_irq_txempty()
977 writel(i2c->msg->buf[i2c->msg_ptr++], _IDBR(i2c)); in i2c_pxa_irq_txempty()
985 if ((i2c->msg_ptr == i2c->msg->len) && in i2c_pxa_irq_txempty()
986 ((i2c->msg->flags & I2C_M_STOP) || in i2c_pxa_irq_txempty()
987 (i2c->msg_idx == i2c->msg_num - 1))) in i2c_pxa_irq_txempty()
990 } else if (i2c->msg_idx < i2c->msg_num - 1) { in i2c_pxa_irq_txempty()
994 i2c->msg_ptr = 0; in i2c_pxa_irq_txempty()
995 i2c->msg_idx ++; in i2c_pxa_irq_txempty()
996 i2c->msg++; in i2c_pxa_irq_txempty()
1003 if (i2c->msg->flags & I2C_M_NOSTART) in i2c_pxa_irq_txempty()
1009 writel(i2c_pxa_addr_byte(i2c->msg), _IDBR(i2c)); in i2c_pxa_irq_txempty()
1010 i2c->req_slave_addr = i2c_pxa_addr_byte(i2c->msg); in i2c_pxa_irq_txempty()
1018 if (i2c->msg->len == 0) { in i2c_pxa_irq_txempty()
1024 i2c_pxa_reset(i2c); in i2c_pxa_irq_txempty()
1026 i2c_pxa_master_complete(i2c, 0); in i2c_pxa_irq_txempty()
1029 i2c->icrlog[i2c->irqlogidx-1] = icr; in i2c_pxa_irq_txempty()
1031 writel(icr, _ICR(i2c)); in i2c_pxa_irq_txempty()
1032 show_state(i2c); in i2c_pxa_irq_txempty()
1035 static void i2c_pxa_irq_rxfull(struct pxa_i2c *i2c, u32 isr) in i2c_pxa_irq_rxfull() argument
1037 u32 icr = readl(_ICR(i2c)) & ~(ICR_START|ICR_STOP|ICR_ACKNAK|ICR_TB); in i2c_pxa_irq_rxfull()
1042 i2c->msg->buf[i2c->msg_ptr++] = readl(_IDBR(i2c)); in i2c_pxa_irq_rxfull()
1044 if (i2c->msg_ptr < i2c->msg->len) { in i2c_pxa_irq_rxfull()
1049 if (i2c->msg_ptr == i2c->msg->len - 1) in i2c_pxa_irq_rxfull()
1054 i2c_pxa_master_complete(i2c, 0); in i2c_pxa_irq_rxfull()
1057 i2c->icrlog[i2c->irqlogidx-1] = icr; in i2c_pxa_irq_rxfull()
1059 writel(icr, _ICR(i2c)); in i2c_pxa_irq_rxfull()
1066 struct pxa_i2c *i2c = dev_id; in i2c_pxa_handler() local
1067 u32 isr = readl(_ISR(i2c)); in i2c_pxa_handler()
1073 dev_dbg(&i2c->adap.dev, "%s: ISR=%08x, ICR=%08x, IBMR=%02x\n", in i2c_pxa_handler()
1074 __func__, isr, readl(_ICR(i2c)), readl(_IBMR(i2c))); in i2c_pxa_handler()
1078 if (i2c->irqlogidx < ARRAY_SIZE(i2c->isrlog)) in i2c_pxa_handler()
1079 i2c->isrlog[i2c->irqlogidx++] = isr; in i2c_pxa_handler()
1081 show_state(i2c); in i2c_pxa_handler()
1086 writel(isr & VALID_INT_SOURCE, _ISR(i2c)); in i2c_pxa_handler()
1089 i2c_pxa_slave_start(i2c, isr); in i2c_pxa_handler()
1091 i2c_pxa_slave_stop(i2c); in i2c_pxa_handler()
1093 if (i2c_pxa_is_slavemode(i2c)) { in i2c_pxa_handler()
1095 i2c_pxa_slave_txempty(i2c, isr); in i2c_pxa_handler()
1097 i2c_pxa_slave_rxfull(i2c, isr); in i2c_pxa_handler()
1098 } else if (i2c->msg && (!i2c->highmode_enter)) { in i2c_pxa_handler()
1100 i2c_pxa_irq_txempty(i2c, isr); in i2c_pxa_handler()
1102 i2c_pxa_irq_rxfull(i2c, isr); in i2c_pxa_handler()
1103 } else if ((isr & ISR_ITE) && i2c->highmode_enter) { in i2c_pxa_handler()
1104 i2c->highmode_enter = false; in i2c_pxa_handler()
1105 wake_up(&i2c->wait); in i2c_pxa_handler()
1107 i2c_pxa_scream_blue_murder(i2c, "spurious irq"); in i2c_pxa_handler()
1116 struct pxa_i2c *i2c = adap->algo_data; in i2c_pxa_xfer() local
1120 ret = i2c_pxa_do_xfer(i2c, msgs, num); in i2c_pxa_xfer()
1128 i2c_pxa_scream_blue_murder(i2c, "exhausted retries"); in i2c_pxa_xfer()
1131 i2c_pxa_set_slave(i2c, ret); in i2c_pxa_xfer()
1152 { .compatible = "mrvl,pxa-i2c", .data = (void *)REGS_PXA2XX },
1155 { .compatible = "marvell,armada-3700-i2c", .data = (void *)REGS_A3700 },
1160 static int i2c_pxa_probe_dt(struct platform_device *pdev, struct pxa_i2c *i2c, in i2c_pxa_probe_dt() argument
1171 i2c->adap.nr = -1; in i2c_pxa_probe_dt()
1173 if (of_get_property(np, "mrvl,i2c-polling", NULL)) in i2c_pxa_probe_dt()
1174 i2c->use_pio = 1; in i2c_pxa_probe_dt()
1175 if (of_get_property(np, "mrvl,i2c-fast-mode", NULL)) in i2c_pxa_probe_dt()
1176 i2c->fast_mode = 1; in i2c_pxa_probe_dt()
1184 struct pxa_i2c *i2c, in i2c_pxa_probe_pdata() argument
1192 i2c->use_pio = plat->use_pio; in i2c_pxa_probe_pdata()
1193 i2c->fast_mode = plat->fast_mode; in i2c_pxa_probe_pdata()
1194 i2c->high_mode = plat->high_mode; in i2c_pxa_probe_pdata()
1195 i2c->master_code = plat->master_code; in i2c_pxa_probe_pdata()
1196 if (!i2c->master_code) in i2c_pxa_probe_pdata()
1197 i2c->master_code = 0xe; in i2c_pxa_probe_pdata()
1198 i2c->rate = plat->rate; in i2c_pxa_probe_pdata()
1207 struct pxa_i2c *i2c; in i2c_pxa_probe() local
1211 i2c = devm_kzalloc(&dev->dev, sizeof(struct pxa_i2c), GFP_KERNEL); in i2c_pxa_probe()
1212 if (!i2c) in i2c_pxa_probe()
1216 i2c->reg_base = devm_ioremap_resource(&dev->dev, res); in i2c_pxa_probe()
1217 if (IS_ERR(i2c->reg_base)) in i2c_pxa_probe()
1218 return PTR_ERR(i2c->reg_base); in i2c_pxa_probe()
1227 i2c->adap.nr = dev->id; in i2c_pxa_probe()
1229 ret = i2c_pxa_probe_dt(dev, i2c, &i2c_type); in i2c_pxa_probe()
1231 ret = i2c_pxa_probe_pdata(dev, i2c, &i2c_type); in i2c_pxa_probe()
1235 i2c->adap.owner = THIS_MODULE; in i2c_pxa_probe()
1236 i2c->adap.retries = 5; in i2c_pxa_probe()
1238 spin_lock_init(&i2c->lock); in i2c_pxa_probe()
1239 init_waitqueue_head(&i2c->wait); in i2c_pxa_probe()
1241 strlcpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name)); in i2c_pxa_probe()
1243 i2c->clk = devm_clk_get(&dev->dev, NULL); in i2c_pxa_probe()
1244 if (IS_ERR(i2c->clk)) { in i2c_pxa_probe()
1245 dev_err(&dev->dev, "failed to get the clk: %ld\n", PTR_ERR(i2c->clk)); in i2c_pxa_probe()
1246 return PTR_ERR(i2c->clk); in i2c_pxa_probe()
1249 i2c->reg_ibmr = i2c->reg_base + pxa_reg_layout[i2c_type].ibmr; in i2c_pxa_probe()
1250 i2c->reg_idbr = i2c->reg_base + pxa_reg_layout[i2c_type].idbr; in i2c_pxa_probe()
1251 i2c->reg_icr = i2c->reg_base + pxa_reg_layout[i2c_type].icr; in i2c_pxa_probe()
1252 i2c->reg_isr = i2c->reg_base + pxa_reg_layout[i2c_type].isr; in i2c_pxa_probe()
1253 i2c->fm_mask = pxa_reg_layout[i2c_type].fm ? : ICR_FM; in i2c_pxa_probe()
1254 i2c->hs_mask = pxa_reg_layout[i2c_type].hs ? : ICR_HS; in i2c_pxa_probe()
1257 i2c->reg_isar = i2c->reg_base + pxa_reg_layout[i2c_type].isar; in i2c_pxa_probe()
1260 i2c->reg_ilcr = i2c->reg_base + pxa_reg_layout[i2c_type].ilcr; in i2c_pxa_probe()
1261 i2c->reg_iwcr = i2c->reg_base + pxa_reg_layout[i2c_type].iwcr; in i2c_pxa_probe()
1264 i2c->iobase = res->start; in i2c_pxa_probe()
1265 i2c->iosize = resource_size(res); in i2c_pxa_probe()
1267 i2c->irq = irq; in i2c_pxa_probe()
1269 i2c->slave_addr = I2C_PXA_SLAVE_ADDR; in i2c_pxa_probe()
1270 i2c->highmode_enter = false; in i2c_pxa_probe()
1274 i2c->slave_addr = plat->slave_addr; in i2c_pxa_probe()
1275 i2c->slave = plat->slave; in i2c_pxa_probe()
1277 i2c->adap.class = plat->class; in i2c_pxa_probe()
1280 if (i2c->high_mode) { in i2c_pxa_probe()
1281 if (i2c->rate) { in i2c_pxa_probe()
1282 clk_set_rate(i2c->clk, i2c->rate); in i2c_pxa_probe()
1283 pr_info("i2c: <%s> set rate to %ld\n", in i2c_pxa_probe()
1284 i2c->adap.name, clk_get_rate(i2c->clk)); in i2c_pxa_probe()
1286 pr_warn("i2c: <%s> clock rate not set\n", in i2c_pxa_probe()
1287 i2c->adap.name); in i2c_pxa_probe()
1290 clk_prepare_enable(i2c->clk); in i2c_pxa_probe()
1292 if (i2c->use_pio) { in i2c_pxa_probe()
1293 i2c->adap.algo = &i2c_pxa_pio_algorithm; in i2c_pxa_probe()
1295 i2c->adap.algo = &i2c_pxa_algorithm; in i2c_pxa_probe()
1298 dev_name(&dev->dev), i2c); in i2c_pxa_probe()
1305 i2c_pxa_reset(i2c); in i2c_pxa_probe()
1307 i2c->adap.algo_data = i2c; in i2c_pxa_probe()
1308 i2c->adap.dev.parent = &dev->dev; in i2c_pxa_probe()
1310 i2c->adap.dev.of_node = dev->dev.of_node; in i2c_pxa_probe()
1313 ret = i2c_add_numbered_adapter(&i2c->adap); in i2c_pxa_probe()
1317 platform_set_drvdata(dev, i2c); in i2c_pxa_probe()
1320 dev_info(&i2c->adap.dev, " PXA I2C adapter, slave address %d\n", in i2c_pxa_probe()
1321 i2c->slave_addr); in i2c_pxa_probe()
1323 dev_info(&i2c->adap.dev, " PXA I2C adapter\n"); in i2c_pxa_probe()
1328 clk_disable_unprepare(i2c->clk); in i2c_pxa_probe()
1334 struct pxa_i2c *i2c = platform_get_drvdata(dev); in i2c_pxa_remove() local
1336 i2c_del_adapter(&i2c->adap); in i2c_pxa_remove()
1338 clk_disable_unprepare(i2c->clk); in i2c_pxa_remove()
1346 struct pxa_i2c *i2c = dev_get_drvdata(dev); in i2c_pxa_suspend_noirq() local
1348 clk_disable(i2c->clk); in i2c_pxa_suspend_noirq()
1355 struct pxa_i2c *i2c = dev_get_drvdata(dev); in i2c_pxa_resume_noirq() local
1357 clk_enable(i2c->clk); in i2c_pxa_resume_noirq()
1358 i2c_pxa_reset(i2c); in i2c_pxa_resume_noirq()
1377 .name = "pxa2xx-i2c",
1395 MODULE_ALIAS("platform:pxa2xx-i2c");