Lines Matching refs:dev
95 struct device *dev; member
113 static unsigned at91_twi_read(struct at91_twi_dev *dev, unsigned reg) in at91_twi_read() argument
115 return readl_relaxed(dev->base + reg); in at91_twi_read()
118 static void at91_twi_write(struct at91_twi_dev *dev, unsigned reg, unsigned val) in at91_twi_write() argument
120 writel_relaxed(val, dev->base + reg); in at91_twi_write()
123 static void at91_disable_twi_interrupts(struct at91_twi_dev *dev) in at91_disable_twi_interrupts() argument
125 at91_twi_write(dev, AT91_TWI_IDR, AT91_TWI_INT_MASK); in at91_disable_twi_interrupts()
128 static void at91_twi_irq_save(struct at91_twi_dev *dev) in at91_twi_irq_save() argument
130 dev->imr = at91_twi_read(dev, AT91_TWI_IMR) & AT91_TWI_INT_MASK; in at91_twi_irq_save()
131 at91_disable_twi_interrupts(dev); in at91_twi_irq_save()
134 static void at91_twi_irq_restore(struct at91_twi_dev *dev) in at91_twi_irq_restore() argument
136 at91_twi_write(dev, AT91_TWI_IER, dev->imr); in at91_twi_irq_restore()
139 static void at91_init_twi_bus(struct at91_twi_dev *dev) in at91_init_twi_bus() argument
141 at91_disable_twi_interrupts(dev); in at91_init_twi_bus()
142 at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_SWRST); in at91_init_twi_bus()
143 at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_MSEN); in at91_init_twi_bus()
144 at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_SVDIS); in at91_init_twi_bus()
145 at91_twi_write(dev, AT91_TWI_CWGR, dev->twi_cwgr_reg); in at91_init_twi_bus()
152 static void at91_calc_twi_clock(struct at91_twi_dev *dev, int twi_clk) in at91_calc_twi_clock() argument
155 struct at91_twi_pdata *pdata = dev->pdata; in at91_calc_twi_clock()
159 div = max(0, (int)DIV_ROUND_UP(clk_get_rate(dev->clk), in at91_calc_twi_clock()
165 dev_warn(dev->dev, "%d exceeds ckdiv max value which is %d.\n", in at91_calc_twi_clock()
171 dev->twi_cwgr_reg = (ckdiv << 16) | (cdiv << 8) | cdiv; in at91_calc_twi_clock()
172 dev_dbg(dev->dev, "cdiv %d ckdiv %d\n", cdiv, ckdiv); in at91_calc_twi_clock()
175 static void at91_twi_dma_cleanup(struct at91_twi_dev *dev) in at91_twi_dma_cleanup() argument
177 struct at91_twi_dma *dma = &dev->dma; in at91_twi_dma_cleanup()
179 at91_twi_irq_save(dev); in at91_twi_dma_cleanup()
189 dma_unmap_single(dev->dev, sg_dma_address(&dma->sg), in at91_twi_dma_cleanup()
190 dev->buf_len, dma->direction); in at91_twi_dma_cleanup()
194 at91_twi_irq_restore(dev); in at91_twi_dma_cleanup()
197 static void at91_twi_write_next_byte(struct at91_twi_dev *dev) in at91_twi_write_next_byte() argument
199 if (dev->buf_len <= 0) in at91_twi_write_next_byte()
202 at91_twi_write(dev, AT91_TWI_THR, *dev->buf); in at91_twi_write_next_byte()
205 if (--dev->buf_len == 0) in at91_twi_write_next_byte()
206 at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_STOP); in at91_twi_write_next_byte()
208 dev_dbg(dev->dev, "wrote 0x%x, to go %d\n", *dev->buf, dev->buf_len); in at91_twi_write_next_byte()
210 ++dev->buf; in at91_twi_write_next_byte()
215 struct at91_twi_dev *dev = (struct at91_twi_dev *)data; in at91_twi_write_data_dma_callback() local
217 dma_unmap_single(dev->dev, sg_dma_address(&dev->dma.sg), in at91_twi_write_data_dma_callback()
218 dev->buf_len, DMA_TO_DEVICE); in at91_twi_write_data_dma_callback()
227 at91_twi_write(dev, AT91_TWI_IER, AT91_TWI_TXCOMP); in at91_twi_write_data_dma_callback()
228 at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_STOP); in at91_twi_write_data_dma_callback()
231 static void at91_twi_write_data_dma(struct at91_twi_dev *dev) in at91_twi_write_data_dma() argument
235 struct at91_twi_dma *dma = &dev->dma; in at91_twi_write_data_dma()
238 if (dev->buf_len <= 0) in at91_twi_write_data_dma()
243 at91_twi_irq_save(dev); in at91_twi_write_data_dma()
244 dma_addr = dma_map_single(dev->dev, dev->buf, dev->buf_len, in at91_twi_write_data_dma()
246 if (dma_mapping_error(dev->dev, dma_addr)) { in at91_twi_write_data_dma()
247 dev_err(dev->dev, "dma map failed\n"); in at91_twi_write_data_dma()
251 at91_twi_irq_restore(dev); in at91_twi_write_data_dma()
252 sg_dma_len(&dma->sg) = dev->buf_len; in at91_twi_write_data_dma()
258 dev_err(dev->dev, "dma prep slave sg failed\n"); in at91_twi_write_data_dma()
263 txdesc->callback_param = dev; in at91_twi_write_data_dma()
272 at91_twi_dma_cleanup(dev); in at91_twi_write_data_dma()
275 static void at91_twi_read_next_byte(struct at91_twi_dev *dev) in at91_twi_read_next_byte() argument
277 if (dev->buf_len <= 0) in at91_twi_read_next_byte()
280 *dev->buf = at91_twi_read(dev, AT91_TWI_RHR) & 0xff; in at91_twi_read_next_byte()
281 --dev->buf_len; in at91_twi_read_next_byte()
284 if (dev->recv_len_abort) in at91_twi_read_next_byte()
288 if (unlikely(dev->msg->flags & I2C_M_RECV_LEN)) { in at91_twi_read_next_byte()
290 if (*dev->buf <= I2C_SMBUS_BLOCK_MAX && *dev->buf > 0) { in at91_twi_read_next_byte()
291 dev->msg->flags &= ~I2C_M_RECV_LEN; in at91_twi_read_next_byte()
292 dev->buf_len += *dev->buf; in at91_twi_read_next_byte()
293 dev->msg->len = dev->buf_len + 1; in at91_twi_read_next_byte()
294 dev_dbg(dev->dev, "received block length %d\n", in at91_twi_read_next_byte()
295 dev->buf_len); in at91_twi_read_next_byte()
298 dev->recv_len_abort = true; in at91_twi_read_next_byte()
299 dev->buf_len = 1; in at91_twi_read_next_byte()
304 if (dev->buf_len == 1) in at91_twi_read_next_byte()
305 at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_STOP); in at91_twi_read_next_byte()
307 dev_dbg(dev->dev, "read 0x%x, to go %d\n", *dev->buf, dev->buf_len); in at91_twi_read_next_byte()
309 ++dev->buf; in at91_twi_read_next_byte()
314 struct at91_twi_dev *dev = (struct at91_twi_dev *)data; in at91_twi_read_data_dma_callback() local
316 dma_unmap_single(dev->dev, sg_dma_address(&dev->dma.sg), in at91_twi_read_data_dma_callback()
317 dev->buf_len, DMA_FROM_DEVICE); in at91_twi_read_data_dma_callback()
320 dev->buf += dev->buf_len - 2; in at91_twi_read_data_dma_callback()
321 dev->buf_len = 2; in at91_twi_read_data_dma_callback()
322 at91_twi_write(dev, AT91_TWI_IER, AT91_TWI_RXRDY | AT91_TWI_TXCOMP); in at91_twi_read_data_dma_callback()
325 static void at91_twi_read_data_dma(struct at91_twi_dev *dev) in at91_twi_read_data_dma() argument
329 struct at91_twi_dma *dma = &dev->dma; in at91_twi_read_data_dma()
335 at91_twi_irq_save(dev); in at91_twi_read_data_dma()
336 dma_addr = dma_map_single(dev->dev, dev->buf, dev->buf_len - 2, in at91_twi_read_data_dma()
338 if (dma_mapping_error(dev->dev, dma_addr)) { in at91_twi_read_data_dma()
339 dev_err(dev->dev, "dma map failed\n"); in at91_twi_read_data_dma()
343 at91_twi_irq_restore(dev); in at91_twi_read_data_dma()
345 sg_dma_len(&dma->sg) = dev->buf_len - 2; in at91_twi_read_data_dma()
350 dev_err(dev->dev, "dma prep slave sg failed\n"); in at91_twi_read_data_dma()
355 rxdesc->callback_param = dev; in at91_twi_read_data_dma()
364 at91_twi_dma_cleanup(dev); in at91_twi_read_data_dma()
369 struct at91_twi_dev *dev = dev_id; in atmel_twi_interrupt() local
370 const unsigned status = at91_twi_read(dev, AT91_TWI_SR); in atmel_twi_interrupt()
371 const unsigned irqstatus = status & at91_twi_read(dev, AT91_TWI_IMR); in atmel_twi_interrupt()
376 at91_twi_read_next_byte(dev); in atmel_twi_interrupt()
378 at91_twi_write_next_byte(dev); in atmel_twi_interrupt()
381 dev->transfer_status |= status; in atmel_twi_interrupt()
384 at91_disable_twi_interrupts(dev); in atmel_twi_interrupt()
385 complete(&dev->cmd_complete); in atmel_twi_interrupt()
391 static int at91_do_twi_transfer(struct at91_twi_dev *dev) in at91_do_twi_transfer() argument
395 bool has_unre_flag = dev->pdata->has_unre_flag; in at91_do_twi_transfer()
425 dev_dbg(dev->dev, "transfer: %s %d bytes.\n", in at91_do_twi_transfer()
426 (dev->msg->flags & I2C_M_RD) ? "read" : "write", dev->buf_len); in at91_do_twi_transfer()
428 reinit_completion(&dev->cmd_complete); in at91_do_twi_transfer()
429 dev->transfer_status = 0; in at91_do_twi_transfer()
431 if (!dev->buf_len) { in at91_do_twi_transfer()
432 at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_QUICK); in at91_do_twi_transfer()
433 at91_twi_write(dev, AT91_TWI_IER, AT91_TWI_TXCOMP); in at91_do_twi_transfer()
434 } else if (dev->msg->flags & I2C_M_RD) { in at91_do_twi_transfer()
437 if (at91_twi_read(dev, AT91_TWI_SR) & AT91_TWI_RXRDY) { in at91_do_twi_transfer()
438 dev_err(dev->dev, "RXRDY still set!"); in at91_do_twi_transfer()
439 at91_twi_read(dev, AT91_TWI_RHR); in at91_do_twi_transfer()
443 if (dev->buf_len <= 1 && !(dev->msg->flags & I2C_M_RECV_LEN)) in at91_do_twi_transfer()
445 at91_twi_write(dev, AT91_TWI_CR, start_flags); in at91_do_twi_transfer()
454 if (dev->use_dma && (dev->buf_len > AT91_I2C_DMA_THRESHOLD)) { in at91_do_twi_transfer()
455 at91_twi_write(dev, AT91_TWI_IER, AT91_TWI_NACK); in at91_do_twi_transfer()
456 at91_twi_read_data_dma(dev); in at91_do_twi_transfer()
458 at91_twi_write(dev, AT91_TWI_IER, in at91_do_twi_transfer()
464 if (dev->use_dma && (dev->buf_len > AT91_I2C_DMA_THRESHOLD)) { in at91_do_twi_transfer()
465 at91_twi_write(dev, AT91_TWI_IER, AT91_TWI_NACK); in at91_do_twi_transfer()
466 at91_twi_write_data_dma(dev); in at91_do_twi_transfer()
468 at91_twi_write_next_byte(dev); in at91_do_twi_transfer()
469 at91_twi_write(dev, AT91_TWI_IER, in at91_do_twi_transfer()
476 time_left = wait_for_completion_timeout(&dev->cmd_complete, in at91_do_twi_transfer()
477 dev->adapter.timeout); in at91_do_twi_transfer()
479 dev_err(dev->dev, "controller timed out\n"); in at91_do_twi_transfer()
480 at91_init_twi_bus(dev); in at91_do_twi_transfer()
484 if (dev->transfer_status & AT91_TWI_NACK) { in at91_do_twi_transfer()
485 dev_dbg(dev->dev, "received nack\n"); in at91_do_twi_transfer()
489 if (dev->transfer_status & AT91_TWI_OVRE) { in at91_do_twi_transfer()
490 dev_err(dev->dev, "overrun while reading\n"); in at91_do_twi_transfer()
494 if (has_unre_flag && dev->transfer_status & AT91_TWI_UNRE) { in at91_do_twi_transfer()
495 dev_err(dev->dev, "underrun while writing\n"); in at91_do_twi_transfer()
499 if (dev->recv_len_abort) { in at91_do_twi_transfer()
500 dev_err(dev->dev, "invalid smbus block length recvd\n"); in at91_do_twi_transfer()
505 dev_dbg(dev->dev, "transfer complete\n"); in at91_do_twi_transfer()
510 at91_twi_dma_cleanup(dev); in at91_do_twi_transfer()
516 struct at91_twi_dev *dev = i2c_get_adapdata(adap); in at91_twi_xfer() local
521 dev_dbg(&adap->dev, "at91_xfer: processing %d messages:\n", num); in at91_twi_xfer()
523 ret = pm_runtime_get_sync(dev->dev); in at91_twi_xfer()
539 at91_twi_write(dev, AT91_TWI_IADR, internal_address); in at91_twi_xfer()
542 at91_twi_write(dev, AT91_TWI_MMR, (m_start->addr << 16) | int_addr_flag in at91_twi_xfer()
545 dev->buf_len = m_start->len; in at91_twi_xfer()
546 dev->buf = m_start->buf; in at91_twi_xfer()
547 dev->msg = m_start; in at91_twi_xfer()
548 dev->recv_len_abort = false; in at91_twi_xfer()
550 ret = at91_do_twi_transfer(dev); in at91_twi_xfer()
554 pm_runtime_mark_last_busy(dev->dev); in at91_twi_xfer()
555 pm_runtime_put_autosuspend(dev->dev); in at91_twi_xfer()
664 static int at91_twi_configure_dma(struct at91_twi_dev *dev, u32 phy_addr) in at91_twi_configure_dma() argument
668 struct at91_twi_dma *dma = &dev->dma; in at91_twi_configure_dma()
679 dma->chan_tx = dma_request_slave_channel_reason(dev->dev, "tx"); in at91_twi_configure_dma()
686 dma->chan_rx = dma_request_slave_channel_reason(dev->dev, "rx"); in at91_twi_configure_dma()
695 dev_err(dev->dev, "failed to configure tx channel\n"); in at91_twi_configure_dma()
702 dev_err(dev->dev, "failed to configure rx channel\n"); in at91_twi_configure_dma()
710 dev->use_dma = true; in at91_twi_configure_dma()
712 dev_info(dev->dev, "using %s (tx) and %s (rx) for DMA transfers\n", in at91_twi_configure_dma()
719 dev_info(dev->dev, "can't use DMA, error %d\n", ret); in at91_twi_configure_dma()
730 if (pdev->dev.of_node) { in at91_twi_get_driver_data()
732 match = of_match_node(atmel_twi_dt_ids, pdev->dev.of_node); in at91_twi_get_driver_data()
742 struct at91_twi_dev *dev; in at91_twi_probe() local
748 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); in at91_twi_probe()
749 if (!dev) in at91_twi_probe()
751 init_completion(&dev->cmd_complete); in at91_twi_probe()
752 dev->dev = &pdev->dev; in at91_twi_probe()
759 dev->pdata = at91_twi_get_driver_data(pdev); in at91_twi_probe()
760 if (!dev->pdata) in at91_twi_probe()
763 dev->base = devm_ioremap_resource(&pdev->dev, mem); in at91_twi_probe()
764 if (IS_ERR(dev->base)) in at91_twi_probe()
765 return PTR_ERR(dev->base); in at91_twi_probe()
767 dev->irq = platform_get_irq(pdev, 0); in at91_twi_probe()
768 if (dev->irq < 0) in at91_twi_probe()
769 return dev->irq; in at91_twi_probe()
771 rc = devm_request_irq(&pdev->dev, dev->irq, atmel_twi_interrupt, 0, in at91_twi_probe()
772 dev_name(dev->dev), dev); in at91_twi_probe()
774 dev_err(dev->dev, "Cannot get irq %d: %d\n", dev->irq, rc); in at91_twi_probe()
778 platform_set_drvdata(pdev, dev); in at91_twi_probe()
780 dev->clk = devm_clk_get(dev->dev, NULL); in at91_twi_probe()
781 if (IS_ERR(dev->clk)) { in at91_twi_probe()
782 dev_err(dev->dev, "no clock defined\n"); in at91_twi_probe()
785 clk_prepare_enable(dev->clk); in at91_twi_probe()
787 if (dev->dev->of_node) { in at91_twi_probe()
788 rc = at91_twi_configure_dma(dev, phy_addr); in at91_twi_probe()
793 rc = of_property_read_u32(dev->dev->of_node, "clock-frequency", in at91_twi_probe()
798 at91_calc_twi_clock(dev, bus_clk_rate); in at91_twi_probe()
799 at91_init_twi_bus(dev); in at91_twi_probe()
801 snprintf(dev->adapter.name, sizeof(dev->adapter.name), "AT91"); in at91_twi_probe()
802 i2c_set_adapdata(&dev->adapter, dev); in at91_twi_probe()
803 dev->adapter.owner = THIS_MODULE; in at91_twi_probe()
804 dev->adapter.class = I2C_CLASS_DEPRECATED; in at91_twi_probe()
805 dev->adapter.algo = &at91_twi_algorithm; in at91_twi_probe()
806 dev->adapter.quirks = &at91_twi_quirks; in at91_twi_probe()
807 dev->adapter.dev.parent = dev->dev; in at91_twi_probe()
808 dev->adapter.nr = pdev->id; in at91_twi_probe()
809 dev->adapter.timeout = AT91_I2C_TIMEOUT; in at91_twi_probe()
810 dev->adapter.dev.of_node = pdev->dev.of_node; in at91_twi_probe()
812 pm_runtime_set_autosuspend_delay(dev->dev, AUTOSUSPEND_TIMEOUT); in at91_twi_probe()
813 pm_runtime_use_autosuspend(dev->dev); in at91_twi_probe()
814 pm_runtime_set_active(dev->dev); in at91_twi_probe()
815 pm_runtime_enable(dev->dev); in at91_twi_probe()
817 rc = i2c_add_numbered_adapter(&dev->adapter); in at91_twi_probe()
819 dev_err(dev->dev, "Adapter %s registration failed\n", in at91_twi_probe()
820 dev->adapter.name); in at91_twi_probe()
821 clk_disable_unprepare(dev->clk); in at91_twi_probe()
823 pm_runtime_disable(dev->dev); in at91_twi_probe()
824 pm_runtime_set_suspended(dev->dev); in at91_twi_probe()
829 dev_info(dev->dev, "AT91 i2c bus driver.\n"); in at91_twi_probe()
835 struct at91_twi_dev *dev = platform_get_drvdata(pdev); in at91_twi_remove() local
837 i2c_del_adapter(&dev->adapter); in at91_twi_remove()
838 clk_disable_unprepare(dev->clk); in at91_twi_remove()
840 pm_runtime_disable(dev->dev); in at91_twi_remove()
841 pm_runtime_set_suspended(dev->dev); in at91_twi_remove()
848 static int at91_twi_runtime_suspend(struct device *dev) in at91_twi_runtime_suspend() argument
850 struct at91_twi_dev *twi_dev = dev_get_drvdata(dev); in at91_twi_runtime_suspend()
854 pinctrl_pm_select_sleep_state(dev); in at91_twi_runtime_suspend()
859 static int at91_twi_runtime_resume(struct device *dev) in at91_twi_runtime_resume() argument
861 struct at91_twi_dev *twi_dev = dev_get_drvdata(dev); in at91_twi_runtime_resume()
863 pinctrl_pm_select_default_state(dev); in at91_twi_runtime_resume()
868 static int at91_twi_suspend_noirq(struct device *dev) in at91_twi_suspend_noirq() argument
870 if (!pm_runtime_status_suspended(dev)) in at91_twi_suspend_noirq()
871 at91_twi_runtime_suspend(dev); in at91_twi_suspend_noirq()
876 static int at91_twi_resume_noirq(struct device *dev) in at91_twi_resume_noirq() argument
880 if (!pm_runtime_status_suspended(dev)) { in at91_twi_resume_noirq()
881 ret = at91_twi_runtime_resume(dev); in at91_twi_resume_noirq()
886 pm_runtime_mark_last_busy(dev); in at91_twi_resume_noirq()
887 pm_request_autosuspend(dev); in at91_twi_resume_noirq()