Lines Matching refs:rs
199 static inline void spi_enable_chip(struct rockchip_spi *rs, bool enable) in spi_enable_chip() argument
201 writel_relaxed((enable ? 1U : 0U), rs->regs + ROCKCHIP_SPI_SSIENR); in spi_enable_chip()
204 static inline void wait_for_tx_idle(struct rockchip_spi *rs, bool slave_mode) in wait_for_tx_idle() argument
210 if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_SLAVE_TX_BUSY) && in wait_for_tx_idle()
211 !((readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))) in wait_for_tx_idle()
214 if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)) in wait_for_tx_idle()
219 dev_warn(rs->dev, "spi controller is in busy state!\n"); in wait_for_tx_idle()
222 static u32 get_fifo_len(struct rockchip_spi *rs) in get_fifo_len() argument
226 ver = readl_relaxed(rs->regs + ROCKCHIP_SPI_VERSION); in get_fifo_len()
240 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); in rockchip_spi_set_cs() local
244 if (cs_asserted == rs->cs_asserted[spi->chip_select]) in rockchip_spi_set_cs()
249 pm_runtime_get_sync(rs->dev); in rockchip_spi_set_cs()
252 ROCKCHIP_SPI_SET_BITS(rs->regs + ROCKCHIP_SPI_SER, 1); in rockchip_spi_set_cs()
254 ROCKCHIP_SPI_SET_BITS(rs->regs + ROCKCHIP_SPI_SER, BIT(spi->chip_select)); in rockchip_spi_set_cs()
257 ROCKCHIP_SPI_CLR_BITS(rs->regs + ROCKCHIP_SPI_SER, 1); in rockchip_spi_set_cs()
259 ROCKCHIP_SPI_CLR_BITS(rs->regs + ROCKCHIP_SPI_SER, BIT(spi->chip_select)); in rockchip_spi_set_cs()
262 pm_runtime_put(rs->dev); in rockchip_spi_set_cs()
265 rs->cs_asserted[spi->chip_select] = cs_asserted; in rockchip_spi_set_cs()
271 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); in rockchip_spi_handle_err() local
276 spi_enable_chip(rs, false); in rockchip_spi_handle_err()
279 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_IMR); in rockchip_spi_handle_err()
281 if (atomic_read(&rs->state) & TXDMA) in rockchip_spi_handle_err()
284 if (atomic_read(&rs->state) & RXDMA) in rockchip_spi_handle_err()
288 static void rockchip_spi_pio_writer(struct rockchip_spi *rs) in rockchip_spi_pio_writer() argument
290 u32 tx_free = rs->fifo_len - readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFLR); in rockchip_spi_pio_writer()
291 u32 words = min(rs->tx_left, tx_free); in rockchip_spi_pio_writer()
293 rs->tx_left -= words; in rockchip_spi_pio_writer()
297 if (rs->n_bytes == 1) in rockchip_spi_pio_writer()
298 txw = *(u8 *)rs->tx; in rockchip_spi_pio_writer()
300 txw = *(u16 *)rs->tx; in rockchip_spi_pio_writer()
302 writel_relaxed(txw, rs->regs + ROCKCHIP_SPI_TXDR); in rockchip_spi_pio_writer()
303 rs->tx += rs->n_bytes; in rockchip_spi_pio_writer()
307 static void rockchip_spi_pio_reader(struct rockchip_spi *rs) in rockchip_spi_pio_reader() argument
309 u32 words = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR); in rockchip_spi_pio_reader()
310 u32 rx_left = (rs->rx_left > words) ? rs->rx_left - words : 0; in rockchip_spi_pio_reader()
318 u32 ftl = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFTLR) + 1; in rockchip_spi_pio_reader()
322 words = rs->rx_left - rx_left; in rockchip_spi_pio_reader()
326 rs->rx_left = rx_left; in rockchip_spi_pio_reader()
328 u32 rxw = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR); in rockchip_spi_pio_reader()
330 if (!rs->rx) in rockchip_spi_pio_reader()
333 if (rs->n_bytes == 1) in rockchip_spi_pio_reader()
334 *(u8 *)rs->rx = (u8)rxw; in rockchip_spi_pio_reader()
336 *(u16 *)rs->rx = (u16)rxw; in rockchip_spi_pio_reader()
337 rs->rx += rs->n_bytes; in rockchip_spi_pio_reader()
344 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); in rockchip_spi_isr() local
346 if (rs->tx_left) in rockchip_spi_isr()
347 rockchip_spi_pio_writer(rs); in rockchip_spi_isr()
349 rockchip_spi_pio_reader(rs); in rockchip_spi_isr()
350 if (!rs->rx_left) { in rockchip_spi_isr()
351 spi_enable_chip(rs, false); in rockchip_spi_isr()
352 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_IMR); in rockchip_spi_isr()
359 static int rockchip_spi_prepare_irq(struct rockchip_spi *rs, in rockchip_spi_prepare_irq() argument
362 rs->tx = xfer->tx_buf; in rockchip_spi_prepare_irq()
363 rs->rx = xfer->rx_buf; in rockchip_spi_prepare_irq()
364 rs->tx_left = rs->tx ? xfer->len / rs->n_bytes : 0; in rockchip_spi_prepare_irq()
365 rs->rx_left = xfer->len / rs->n_bytes; in rockchip_spi_prepare_irq()
367 writel_relaxed(INT_RF_FULL, rs->regs + ROCKCHIP_SPI_IMR); in rockchip_spi_prepare_irq()
368 spi_enable_chip(rs, true); in rockchip_spi_prepare_irq()
370 if (rs->tx_left) in rockchip_spi_prepare_irq()
371 rockchip_spi_pio_writer(rs); in rockchip_spi_prepare_irq()
380 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); in rockchip_spi_dma_rxcb() local
381 int state = atomic_fetch_andnot(RXDMA, &rs->state); in rockchip_spi_dma_rxcb()
383 if (state & TXDMA && !rs->slave_abort) in rockchip_spi_dma_rxcb()
386 spi_enable_chip(rs, false); in rockchip_spi_dma_rxcb()
393 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); in rockchip_spi_dma_txcb() local
394 int state = atomic_fetch_andnot(TXDMA, &rs->state); in rockchip_spi_dma_txcb()
396 if (state & RXDMA && !rs->slave_abort) in rockchip_spi_dma_txcb()
400 wait_for_tx_idle(rs, ctlr->slave); in rockchip_spi_dma_txcb()
402 spi_enable_chip(rs, false); in rockchip_spi_dma_txcb()
419 static int rockchip_spi_prepare_dma(struct rockchip_spi *rs, in rockchip_spi_prepare_dma() argument
424 atomic_set(&rs->state, 0); in rockchip_spi_prepare_dma()
430 .src_addr = rs->dma_addr_rx, in rockchip_spi_prepare_dma()
431 .src_addr_width = rs->n_bytes, in rockchip_spi_prepare_dma()
433 rs->n_bytes), in rockchip_spi_prepare_dma()
453 .dst_addr = rs->dma_addr_tx, in rockchip_spi_prepare_dma()
454 .dst_addr_width = rs->n_bytes, in rockchip_spi_prepare_dma()
455 .dst_maxburst = rs->fifo_len / 4, in rockchip_spi_prepare_dma()
476 atomic_or(RXDMA, &rs->state); in rockchip_spi_prepare_dma()
481 spi_enable_chip(rs, true); in rockchip_spi_prepare_dma()
484 atomic_or(TXDMA, &rs->state); in rockchip_spi_prepare_dma()
493 static int rockchip_spi_config(struct rockchip_spi *rs, in rockchip_spi_config() argument
506 rs->slave_abort = false; in rockchip_spi_config()
508 cr0 |= rs->rsd << CR0_RSD_OFFSET; in rockchip_spi_config()
540 dev_err(rs->dev, "unknown bits per word: %d\n", in rockchip_spi_config()
552 writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0); in rockchip_spi_config()
553 writel_relaxed(cr1, rs->regs + ROCKCHIP_SPI_CTRLR1); in rockchip_spi_config()
559 if ((xfer->len / rs->n_bytes) < rs->fifo_len) in rockchip_spi_config()
560 writel_relaxed(xfer->len / rs->n_bytes - 1, rs->regs + ROCKCHIP_SPI_RXFTLR); in rockchip_spi_config()
562 writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR); in rockchip_spi_config()
564 writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_DMATDLR); in rockchip_spi_config()
565 writel_relaxed(rockchip_spi_calc_burst_size(xfer->len / rs->n_bytes) - 1, in rockchip_spi_config()
566 rs->regs + ROCKCHIP_SPI_DMARDLR); in rockchip_spi_config()
567 writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR); in rockchip_spi_config()
573 writel_relaxed(2 * DIV_ROUND_UP(rs->freq, 2 * xfer->speed_hz), in rockchip_spi_config()
574 rs->regs + ROCKCHIP_SPI_BAUDR); in rockchip_spi_config()
586 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); in rockchip_spi_slave_abort() local
588 rs->slave_abort = true; in rockchip_spi_slave_abort()
599 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); in rockchip_spi_transfer_one() local
609 WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) && in rockchip_spi_transfer_one()
610 (readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)); in rockchip_spi_transfer_one()
613 dev_err(rs->dev, "No buffer for transfer\n"); in rockchip_spi_transfer_one()
618 dev_err(rs->dev, "Transfer is too long (%d)\n", xfer->len); in rockchip_spi_transfer_one()
622 rs->n_bytes = xfer->bits_per_word <= 8 ? 1 : 2; in rockchip_spi_transfer_one()
626 ret = rockchip_spi_config(rs, spi, xfer, use_dma, ctlr->slave); in rockchip_spi_transfer_one()
631 return rockchip_spi_prepare_dma(rs, ctlr, xfer); in rockchip_spi_transfer_one()
633 return rockchip_spi_prepare_irq(rs, xfer); in rockchip_spi_transfer_one()
640 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); in rockchip_spi_can_dma() local
647 return xfer->len / bytes_per_word >= rs->fifo_len; in rockchip_spi_can_dma()
653 struct rockchip_spi *rs; in rockchip_spi_probe() local
674 rs = spi_controller_get_devdata(ctlr); in rockchip_spi_probe()
679 rs->regs = devm_ioremap_resource(&pdev->dev, mem); in rockchip_spi_probe()
680 if (IS_ERR(rs->regs)) { in rockchip_spi_probe()
681 ret = PTR_ERR(rs->regs); in rockchip_spi_probe()
685 rs->apb_pclk = devm_clk_get(&pdev->dev, "apb_pclk"); in rockchip_spi_probe()
686 if (IS_ERR(rs->apb_pclk)) { in rockchip_spi_probe()
688 ret = PTR_ERR(rs->apb_pclk); in rockchip_spi_probe()
692 rs->spiclk = devm_clk_get(&pdev->dev, "spiclk"); in rockchip_spi_probe()
693 if (IS_ERR(rs->spiclk)) { in rockchip_spi_probe()
695 ret = PTR_ERR(rs->spiclk); in rockchip_spi_probe()
699 ret = clk_prepare_enable(rs->apb_pclk); in rockchip_spi_probe()
705 ret = clk_prepare_enable(rs->spiclk); in rockchip_spi_probe()
711 spi_enable_chip(rs, false); in rockchip_spi_probe()
722 rs->dev = &pdev->dev; in rockchip_spi_probe()
723 rs->freq = clk_get_rate(rs->spiclk); in rockchip_spi_probe()
728 u32 rsd = DIV_ROUND_CLOSEST(rsd_nsecs * (rs->freq >> 8), in rockchip_spi_probe()
731 dev_warn(rs->dev, "%u Hz are too slow to express %u ns delay\n", in rockchip_spi_probe()
732 rs->freq, rsd_nsecs); in rockchip_spi_probe()
735 dev_warn(rs->dev, "%u Hz are too fast to express %u ns delay, clamping at %u ns\n", in rockchip_spi_probe()
736 rs->freq, rsd_nsecs, in rockchip_spi_probe()
737 CR0_RSD_MAX * 1000000000U / rs->freq); in rockchip_spi_probe()
739 rs->rsd = rsd; in rockchip_spi_probe()
742 rs->fifo_len = get_fifo_len(rs); in rockchip_spi_probe()
743 if (!rs->fifo_len) { in rockchip_spi_probe()
773 ctlr->min_speed_hz = rs->freq / BAUDR_SCKDV_MAX; in rockchip_spi_probe()
774 ctlr->max_speed_hz = min(rs->freq / BAUDR_SCKDV_MIN, MAX_SCLK_OUT); in rockchip_spi_probe()
781 ctlr->dma_tx = dma_request_chan(rs->dev, "tx"); in rockchip_spi_probe()
788 dev_warn(rs->dev, "Failed to request TX DMA channel\n"); in rockchip_spi_probe()
792 ctlr->dma_rx = dma_request_chan(rs->dev, "rx"); in rockchip_spi_probe()
798 dev_warn(rs->dev, "Failed to request RX DMA channel\n"); in rockchip_spi_probe()
803 rs->dma_addr_tx = mem->start + ROCKCHIP_SPI_TXDR; in rockchip_spi_probe()
804 rs->dma_addr_rx = mem->start + ROCKCHIP_SPI_RXDR; in rockchip_spi_probe()
808 switch (readl_relaxed(rs->regs + ROCKCHIP_SPI_VERSION)) { in rockchip_spi_probe()
833 clk_disable_unprepare(rs->spiclk); in rockchip_spi_probe()
835 clk_disable_unprepare(rs->apb_pclk); in rockchip_spi_probe()
845 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); in rockchip_spi_remove() local
849 clk_disable_unprepare(rs->spiclk); in rockchip_spi_remove()
850 clk_disable_unprepare(rs->apb_pclk); in rockchip_spi_remove()
889 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); in rockchip_spi_resume() local
899 clk_disable_unprepare(rs->spiclk); in rockchip_spi_resume()
900 clk_disable_unprepare(rs->apb_pclk); in rockchip_spi_resume()
911 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); in rockchip_spi_runtime_suspend() local
913 clk_disable_unprepare(rs->spiclk); in rockchip_spi_runtime_suspend()
914 clk_disable_unprepare(rs->apb_pclk); in rockchip_spi_runtime_suspend()
923 struct rockchip_spi *rs = spi_controller_get_devdata(ctlr); in rockchip_spi_runtime_resume() local
925 ret = clk_prepare_enable(rs->apb_pclk); in rockchip_spi_runtime_resume()
929 ret = clk_prepare_enable(rs->spiclk); in rockchip_spi_runtime_resume()
931 clk_disable_unprepare(rs->apb_pclk); in rockchip_spi_runtime_resume()