Lines Matching refs:i2c
70 #define MXS_I2C_DATA(i2c) ((i2c->dev_type == MXS_I2C_V1) ? 0x60 : 0xa0) argument
72 #define MXS_I2C_DEBUG0_CLR(i2c) ((i2c->dev_type == MXS_I2C_V1) ? 0x78 : 0xb8) argument
133 static int mxs_i2c_reset(struct mxs_i2c_dev *i2c) in mxs_i2c_reset() argument
135 int ret = stmp_reset_block(i2c->regs); in mxs_i2c_reset()
146 writel(i2c->timing0, i2c->regs + MXS_I2C_TIMING0); in mxs_i2c_reset()
147 writel(i2c->timing1, i2c->regs + MXS_I2C_TIMING1); in mxs_i2c_reset()
148 writel(i2c->timing2, i2c->regs + MXS_I2C_TIMING2); in mxs_i2c_reset()
150 writel(MXS_I2C_IRQ_MASK << 8, i2c->regs + MXS_I2C_CTRL1_SET); in mxs_i2c_reset()
155 static void mxs_i2c_dma_finish(struct mxs_i2c_dev *i2c) in mxs_i2c_dma_finish() argument
157 if (i2c->dma_read) { in mxs_i2c_dma_finish()
158 dma_unmap_sg(i2c->dev, &i2c->sg_io[0], 1, DMA_TO_DEVICE); in mxs_i2c_dma_finish()
159 dma_unmap_sg(i2c->dev, &i2c->sg_io[1], 1, DMA_FROM_DEVICE); in mxs_i2c_dma_finish()
161 dma_unmap_sg(i2c->dev, i2c->sg_io, 2, DMA_TO_DEVICE); in mxs_i2c_dma_finish()
167 struct mxs_i2c_dev *i2c = param; in mxs_i2c_dma_irq_callback() local
169 complete(&i2c->cmd_complete); in mxs_i2c_dma_irq_callback()
170 mxs_i2c_dma_finish(i2c); in mxs_i2c_dma_irq_callback()
177 struct mxs_i2c_dev *i2c = i2c_get_adapdata(adap); in mxs_i2c_dma_setup_xfer() local
179 i2c->addr_data = i2c_8bit_addr_from_msg(msg); in mxs_i2c_dma_setup_xfer()
182 i2c->dma_read = true; in mxs_i2c_dma_setup_xfer()
189 i2c->pio_data[0] = MXS_CMD_I2C_SELECT; in mxs_i2c_dma_setup_xfer()
190 desc = dmaengine_prep_slave_sg(i2c->dmach, in mxs_i2c_dma_setup_xfer()
191 (struct scatterlist *)&i2c->pio_data[0], in mxs_i2c_dma_setup_xfer()
194 dev_err(i2c->dev, in mxs_i2c_dma_setup_xfer()
200 sg_init_one(&i2c->sg_io[0], &i2c->addr_data, 1); in mxs_i2c_dma_setup_xfer()
201 dma_map_sg(i2c->dev, &i2c->sg_io[0], 1, DMA_TO_DEVICE); in mxs_i2c_dma_setup_xfer()
202 desc = dmaengine_prep_slave_sg(i2c->dmach, &i2c->sg_io[0], 1, in mxs_i2c_dma_setup_xfer()
207 dev_err(i2c->dev, in mxs_i2c_dma_setup_xfer()
217 i2c->pio_data[1] = flags | MXS_CMD_I2C_READ | in mxs_i2c_dma_setup_xfer()
219 desc = dmaengine_prep_slave_sg(i2c->dmach, in mxs_i2c_dma_setup_xfer()
220 (struct scatterlist *)&i2c->pio_data[1], in mxs_i2c_dma_setup_xfer()
223 dev_err(i2c->dev, in mxs_i2c_dma_setup_xfer()
229 sg_init_one(&i2c->sg_io[1], msg->buf, msg->len); in mxs_i2c_dma_setup_xfer()
230 dma_map_sg(i2c->dev, &i2c->sg_io[1], 1, DMA_FROM_DEVICE); in mxs_i2c_dma_setup_xfer()
231 desc = dmaengine_prep_slave_sg(i2c->dmach, &i2c->sg_io[1], 1, in mxs_i2c_dma_setup_xfer()
236 dev_err(i2c->dev, in mxs_i2c_dma_setup_xfer()
241 i2c->dma_read = false; in mxs_i2c_dma_setup_xfer()
248 i2c->pio_data[0] = flags | MXS_CMD_I2C_WRITE | in mxs_i2c_dma_setup_xfer()
250 desc = dmaengine_prep_slave_sg(i2c->dmach, in mxs_i2c_dma_setup_xfer()
251 (struct scatterlist *)&i2c->pio_data[0], in mxs_i2c_dma_setup_xfer()
254 dev_err(i2c->dev, in mxs_i2c_dma_setup_xfer()
260 sg_init_table(i2c->sg_io, 2); in mxs_i2c_dma_setup_xfer()
261 sg_set_buf(&i2c->sg_io[0], &i2c->addr_data, 1); in mxs_i2c_dma_setup_xfer()
262 sg_set_buf(&i2c->sg_io[1], msg->buf, msg->len); in mxs_i2c_dma_setup_xfer()
263 dma_map_sg(i2c->dev, i2c->sg_io, 2, DMA_TO_DEVICE); in mxs_i2c_dma_setup_xfer()
264 desc = dmaengine_prep_slave_sg(i2c->dmach, i2c->sg_io, 2, in mxs_i2c_dma_setup_xfer()
269 dev_err(i2c->dev, in mxs_i2c_dma_setup_xfer()
280 desc->callback_param = i2c; in mxs_i2c_dma_setup_xfer()
284 dma_async_issue_pending(i2c->dmach); in mxs_i2c_dma_setup_xfer()
289 dma_unmap_sg(i2c->dev, &i2c->sg_io[1], 1, DMA_FROM_DEVICE); in mxs_i2c_dma_setup_xfer()
291 dma_unmap_sg(i2c->dev, &i2c->sg_io[0], 1, DMA_TO_DEVICE); in mxs_i2c_dma_setup_xfer()
293 dmaengine_terminate_sync(i2c->dmach); in mxs_i2c_dma_setup_xfer()
298 dma_unmap_sg(i2c->dev, i2c->sg_io, 2, DMA_TO_DEVICE); in mxs_i2c_dma_setup_xfer()
300 dmaengine_terminate_sync(i2c->dmach); in mxs_i2c_dma_setup_xfer()
304 static int mxs_i2c_pio_wait_xfer_end(struct mxs_i2c_dev *i2c) in mxs_i2c_pio_wait_xfer_end() argument
308 while (readl(i2c->regs + MXS_I2C_CTRL0) & MXS_I2C_CTRL0_RUN) { in mxs_i2c_pio_wait_xfer_end()
309 if (readl(i2c->regs + MXS_I2C_CTRL1) & in mxs_i2c_pio_wait_xfer_end()
320 static int mxs_i2c_pio_check_error_state(struct mxs_i2c_dev *i2c) in mxs_i2c_pio_check_error_state() argument
324 state = readl(i2c->regs + MXS_I2C_CTRL1_CLR) & MXS_I2C_IRQ_MASK; in mxs_i2c_pio_check_error_state()
327 i2c->cmd_err = -ENXIO; in mxs_i2c_pio_check_error_state()
332 i2c->cmd_err = -EIO; in mxs_i2c_pio_check_error_state()
334 return i2c->cmd_err; in mxs_i2c_pio_check_error_state()
337 static void mxs_i2c_pio_trigger_cmd(struct mxs_i2c_dev *i2c, u32 cmd) in mxs_i2c_pio_trigger_cmd() argument
341 writel(cmd, i2c->regs + MXS_I2C_CTRL0); in mxs_i2c_pio_trigger_cmd()
344 reg = readl(i2c->regs + MXS_I2C_CTRL0); in mxs_i2c_pio_trigger_cmd()
346 writel(reg, i2c->regs + MXS_I2C_CTRL0); in mxs_i2c_pio_trigger_cmd()
357 static void mxs_i2c_pio_trigger_write_cmd(struct mxs_i2c_dev *i2c, u32 cmd, in mxs_i2c_pio_trigger_write_cmd() argument
360 writel(cmd, i2c->regs + MXS_I2C_CTRL0); in mxs_i2c_pio_trigger_write_cmd()
362 if (i2c->dev_type == MXS_I2C_V1) in mxs_i2c_pio_trigger_write_cmd()
363 writel(MXS_I2C_CTRL0_PIO_MODE, i2c->regs + MXS_I2C_CTRL0_SET); in mxs_i2c_pio_trigger_write_cmd()
365 writel(data, i2c->regs + MXS_I2C_DATA(i2c)); in mxs_i2c_pio_trigger_write_cmd()
366 writel(MXS_I2C_CTRL0_RUN, i2c->regs + MXS_I2C_CTRL0_SET); in mxs_i2c_pio_trigger_write_cmd()
372 struct mxs_i2c_dev *i2c = i2c_get_adapdata(adap); in mxs_i2c_pio_setup_xfer() local
379 writel(MXS_I2C_IRQ_MASK << 8, i2c->regs + MXS_I2C_CTRL1_CLR); in mxs_i2c_pio_setup_xfer()
414 mxs_i2c_pio_trigger_write_cmd(i2c, MXS_CMD_I2C_SELECT, in mxs_i2c_pio_setup_xfer()
417 ret = mxs_i2c_pio_wait_xfer_end(i2c); in mxs_i2c_pio_setup_xfer()
419 dev_dbg(i2c->dev, in mxs_i2c_pio_setup_xfer()
425 mxs_i2c_pio_trigger_cmd(i2c, in mxs_i2c_pio_setup_xfer()
429 ret = mxs_i2c_pio_wait_xfer_end(i2c); in mxs_i2c_pio_setup_xfer()
431 dev_dbg(i2c->dev, in mxs_i2c_pio_setup_xfer()
436 data = readl(i2c->regs + MXS_I2C_DATA(i2c)); in mxs_i2c_pio_setup_xfer()
506 dev_dbg(i2c->dev, in mxs_i2c_pio_setup_xfer()
514 i2c->regs + MXS_I2C_DEBUG0_CLR(i2c)); in mxs_i2c_pio_setup_xfer()
516 mxs_i2c_pio_trigger_write_cmd(i2c, in mxs_i2c_pio_setup_xfer()
525 ret = mxs_i2c_pio_wait_xfer_end(i2c); in mxs_i2c_pio_setup_xfer()
527 dev_dbg(i2c->dev, in mxs_i2c_pio_setup_xfer()
533 ret = readl(i2c->regs + MXS_I2C_STAT) & in mxs_i2c_pio_setup_xfer()
543 ret = mxs_i2c_pio_check_error_state(i2c); in mxs_i2c_pio_setup_xfer()
547 writel(MXS_I2C_IRQ_MASK, i2c->regs + MXS_I2C_CTRL1_CLR); in mxs_i2c_pio_setup_xfer()
548 writel(MXS_I2C_IRQ_MASK << 8, i2c->regs + MXS_I2C_CTRL1_SET); in mxs_i2c_pio_setup_xfer()
551 if (i2c->dev_type == MXS_I2C_V1) in mxs_i2c_pio_setup_xfer()
552 writel(MXS_I2C_CTRL0_PIO_MODE, i2c->regs + MXS_I2C_CTRL0_CLR); in mxs_i2c_pio_setup_xfer()
563 struct mxs_i2c_dev *i2c = i2c_get_adapdata(adap); in mxs_i2c_xfer_msg() local
571 dev_dbg(i2c->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n", in mxs_i2c_xfer_msg()
584 i2c->cmd_err = 0; in mxs_i2c_xfer_msg()
589 mxs_i2c_reset(i2c); in mxs_i2c_xfer_msg()
591 reinit_completion(&i2c->cmd_complete); in mxs_i2c_xfer_msg()
596 time_left = wait_for_completion_timeout(&i2c->cmd_complete, in mxs_i2c_xfer_msg()
601 ret = i2c->cmd_err; in mxs_i2c_xfer_msg()
610 i2c->regs + MXS_I2C_CTRL1_SET); in mxs_i2c_xfer_msg()
624 if (i2c->dev_type == MXS_I2C_V1) in mxs_i2c_xfer_msg()
625 mxs_i2c_reset(i2c); in mxs_i2c_xfer_msg()
627 dev_dbg(i2c->dev, "Done with err=%d\n", ret); in mxs_i2c_xfer_msg()
632 dev_dbg(i2c->dev, "Timeout!\n"); in mxs_i2c_xfer_msg()
633 mxs_i2c_dma_finish(i2c); in mxs_i2c_xfer_msg()
634 ret = mxs_i2c_reset(i2c); in mxs_i2c_xfer_msg()
663 struct mxs_i2c_dev *i2c = dev_id; in mxs_i2c_isr() local
664 u32 stat = readl(i2c->regs + MXS_I2C_CTRL1) & MXS_I2C_IRQ_MASK; in mxs_i2c_isr()
670 i2c->cmd_err = -ENXIO; in mxs_i2c_isr()
675 i2c->cmd_err = -EIO; in mxs_i2c_isr()
677 writel(stat, i2c->regs + MXS_I2C_CTRL1_CLR); in mxs_i2c_isr()
691 static void mxs_i2c_derive_timing(struct mxs_i2c_dev *i2c, uint32_t speed) in mxs_i2c_derive_timing() argument
698 struct device *dev = i2c->dev; in mxs_i2c_derive_timing()
761 i2c->timing0 = (high_count << 16) | rcv_count; in mxs_i2c_derive_timing()
762 i2c->timing1 = (low_count << 16) | xmit_count; in mxs_i2c_derive_timing()
763 i2c->timing2 = (bus_free << 16 | leadin); in mxs_i2c_derive_timing()
766 static int mxs_i2c_get_ofdata(struct mxs_i2c_dev *i2c) in mxs_i2c_get_ofdata() argument
769 struct device *dev = i2c->dev; in mxs_i2c_get_ofdata()
779 mxs_i2c_derive_timing(i2c, speed); in mxs_i2c_get_ofdata()
794 struct mxs_i2c_dev *i2c; in mxs_i2c_probe() local
798 i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL); in mxs_i2c_probe()
799 if (!i2c) in mxs_i2c_probe()
802 i2c->dev_type = (uintptr_t)of_device_get_match_data(&pdev->dev); in mxs_i2c_probe()
804 i2c->regs = devm_platform_ioremap_resource(pdev, 0); in mxs_i2c_probe()
805 if (IS_ERR(i2c->regs)) in mxs_i2c_probe()
806 return PTR_ERR(i2c->regs); in mxs_i2c_probe()
812 err = devm_request_irq(dev, irq, mxs_i2c_isr, 0, dev_name(dev), i2c); in mxs_i2c_probe()
816 i2c->dev = dev; in mxs_i2c_probe()
818 init_completion(&i2c->cmd_complete); in mxs_i2c_probe()
821 err = mxs_i2c_get_ofdata(i2c); in mxs_i2c_probe()
827 i2c->dmach = dma_request_chan(dev, "rx-tx"); in mxs_i2c_probe()
828 if (IS_ERR(i2c->dmach)) { in mxs_i2c_probe()
829 return dev_err_probe(dev, PTR_ERR(i2c->dmach), in mxs_i2c_probe()
833 platform_set_drvdata(pdev, i2c); in mxs_i2c_probe()
836 err = mxs_i2c_reset(i2c); in mxs_i2c_probe()
840 adap = &i2c->adapter; in mxs_i2c_probe()
848 i2c_set_adapdata(adap, i2c); in mxs_i2c_probe()
852 i2c->regs + MXS_I2C_CTRL0_SET); in mxs_i2c_probe()
861 struct mxs_i2c_dev *i2c = platform_get_drvdata(pdev); in mxs_i2c_remove() local
863 i2c_del_adapter(&i2c->adapter); in mxs_i2c_remove()
865 if (i2c->dmach) in mxs_i2c_remove()
866 dma_release_channel(i2c->dmach); in mxs_i2c_remove()
868 writel(MXS_I2C_CTRL0_SFTRST, i2c->regs + MXS_I2C_CTRL0_SET); in mxs_i2c_remove()