diff options
Diffstat (limited to 'drivers/spi/spi-tegra114.c')
-rw-r--r-- | drivers/spi/spi-tegra114.c | 77 |
1 files changed, 56 insertions, 21 deletions
diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c index 73779cecc3bb..e37712bed0b2 100644 --- a/drivers/spi/spi-tegra114.c +++ b/drivers/spi/spi-tegra114.c @@ -307,10 +307,16 @@ static unsigned tegra_spi_fill_tx_fifo_from_client_txbuf( x |= (u32)(*tx_buf++) << (i * 8); tegra_spi_writel(tspi, x, SPI_TX_FIFO); } + + tspi->cur_tx_pos += written_words * tspi->bytes_per_word; } else { + unsigned int write_bytes; max_n_32bit = min(tspi->curr_dma_words, tx_empty_count); written_words = max_n_32bit; nbytes = written_words * tspi->bytes_per_word; + if (nbytes > t->len - tspi->cur_pos) + nbytes = t->len - tspi->cur_pos; + write_bytes = nbytes; for (count = 0; count < max_n_32bit; count++) { u32 x = 0; @@ -319,8 +325,10 @@ static unsigned tegra_spi_fill_tx_fifo_from_client_txbuf( x |= (u32)(*tx_buf++) << (i * 8); tegra_spi_writel(tspi, x, SPI_TX_FIFO); } + + tspi->cur_tx_pos += write_bytes; } - tspi->cur_tx_pos += written_words * tspi->bytes_per_word; + return written_words; } @@ -344,20 +352,27 @@ static unsigned int tegra_spi_read_rx_fifo_to_client_rxbuf( for (i = 0; len && (i < 4); i++, len--) *rx_buf++ = (x >> i*8) & 0xFF; } - tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; read_words += tspi->curr_dma_words; + tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; } else { u32 rx_mask = ((u32)1 << t->bits_per_word) - 1; + u8 bytes_per_word = tspi->bytes_per_word; + unsigned int read_bytes; + len = rx_full_count * bytes_per_word; + if (len > t->len - tspi->cur_pos) + len = t->len - tspi->cur_pos; + read_bytes = len; for (count = 0; count < rx_full_count; count++) { u32 x = tegra_spi_readl(tspi, SPI_RX_FIFO) & rx_mask; - for (i = 0; (i < tspi->bytes_per_word); i++) + for (i = 0; len && (i < bytes_per_word); i++, len--) *rx_buf++ = (x >> (i*8)) & 0xFF; } - tspi->cur_rx_pos += rx_full_count * tspi->bytes_per_word; read_words += rx_full_count; + tspi->cur_rx_pos += read_bytes; } + return read_words; } @@ -372,12 +387,17 @@ static void tegra_spi_copy_client_txbuf_to_spi_txbuf( unsigned len = tspi->curr_dma_words * tspi->bytes_per_word; memcpy(tspi->tx_dma_buf, t->tx_buf + tspi->cur_pos, len); + tspi->cur_tx_pos += tspi->curr_dma_words * tspi->bytes_per_word; } else { unsigned int i; unsigned int count; u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word; + unsigned int write_bytes; + if (consume > t->len - tspi->cur_pos) + consume = t->len - tspi->cur_pos; + write_bytes = consume; for (count = 0; count < tspi->curr_dma_words; count++) { u32 x = 0; @@ -386,8 +406,9 @@ static void tegra_spi_copy_client_txbuf_to_spi_txbuf( x |= (u32)(*tx_buf++) << (i * 8); tspi->tx_dma_buf[count] = x; } + + tspi->cur_tx_pos += write_bytes; } - tspi->cur_tx_pos += tspi->curr_dma_words * tspi->bytes_per_word; /* Make the dma buffer to read by dma */ dma_sync_single_for_device(tspi->dev, tspi->tx_dma_phys, @@ -405,20 +426,28 @@ static void tegra_spi_copy_spi_rxbuf_to_client_rxbuf( unsigned len = tspi->curr_dma_words * tspi->bytes_per_word; memcpy(t->rx_buf + tspi->cur_rx_pos, tspi->rx_dma_buf, len); + tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; } else { unsigned int i; unsigned int count; unsigned char *rx_buf = t->rx_buf + tspi->cur_rx_pos; u32 rx_mask = ((u32)1 << t->bits_per_word) - 1; + unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word; + unsigned int read_bytes; + if (consume > t->len - tspi->cur_pos) + consume = t->len - tspi->cur_pos; + read_bytes = consume; for (count = 0; count < tspi->curr_dma_words; count++) { u32 x = tspi->rx_dma_buf[count] & rx_mask; - for (i = 0; (i < tspi->bytes_per_word); i++) + for (i = 0; consume && (i < tspi->bytes_per_word); + i++, consume--) *rx_buf++ = (x >> (i*8)) & 0xFF; } + + tspi->cur_rx_pos += read_bytes; } - tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; /* Make the dma buffer to read by dma */ dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys, @@ -730,6 +759,8 @@ static int tegra_spi_start_transfer_one(struct spi_device *spi, if (tspi->is_packed) command1 |= SPI_PACKED; + else + command1 &= ~SPI_PACKED; command1 &= ~(SPI_CS_SEL_MASK | SPI_TX_EN | SPI_RX_EN); tspi->cur_direction = 0; @@ -1067,27 +1098,19 @@ static int tegra_spi_probe(struct platform_device *pdev) spi_irq = platform_get_irq(pdev, 0); tspi->irq = spi_irq; - ret = request_threaded_irq(tspi->irq, tegra_spi_isr, - tegra_spi_isr_thread, IRQF_ONESHOT, - dev_name(&pdev->dev), tspi); - if (ret < 0) { - dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n", - tspi->irq); - goto exit_free_master; - } tspi->clk = devm_clk_get(&pdev->dev, "spi"); if (IS_ERR(tspi->clk)) { dev_err(&pdev->dev, "can not get clock\n"); ret = PTR_ERR(tspi->clk); - goto exit_free_irq; + goto exit_free_master; } tspi->rst = devm_reset_control_get(&pdev->dev, "spi"); if (IS_ERR(tspi->rst)) { dev_err(&pdev->dev, "can not get reset\n"); ret = PTR_ERR(tspi->rst); - goto exit_free_irq; + goto exit_free_master; } tspi->max_buf_size = SPI_FIFO_DEPTH << 2; @@ -1095,7 +1118,7 @@ static int tegra_spi_probe(struct platform_device *pdev) ret = tegra_spi_init_dma_param(tspi, true); if (ret < 0) - goto exit_free_irq; + goto exit_free_master; ret = tegra_spi_init_dma_param(tspi, false); if (ret < 0) goto exit_rx_dma_free; @@ -1117,18 +1140,32 @@ static int tegra_spi_probe(struct platform_device *pdev) dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret); goto exit_pm_disable; } + + reset_control_assert(tspi->rst); + udelay(2); + reset_control_deassert(tspi->rst); tspi->def_command1_reg = SPI_M_S; tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); pm_runtime_put(&pdev->dev); + ret = request_threaded_irq(tspi->irq, tegra_spi_isr, + tegra_spi_isr_thread, IRQF_ONESHOT, + dev_name(&pdev->dev), tspi); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n", + tspi->irq); + goto exit_pm_disable; + } master->dev.of_node = pdev->dev.of_node; ret = devm_spi_register_master(&pdev->dev, master); if (ret < 0) { dev_err(&pdev->dev, "can not register to master err %d\n", ret); - goto exit_pm_disable; + goto exit_free_irq; } return ret; +exit_free_irq: + free_irq(spi_irq, tspi); exit_pm_disable: pm_runtime_disable(&pdev->dev); if (!pm_runtime_status_suspended(&pdev->dev)) @@ -1136,8 +1173,6 @@ exit_pm_disable: tegra_spi_deinit_dma_param(tspi, false); exit_rx_dma_free: tegra_spi_deinit_dma_param(tspi, true); -exit_free_irq: - free_irq(spi_irq, tspi); exit_free_master: spi_master_put(master); return ret; |