diff options
| author | Sowjanya Komatineni <skomatineni@nvidia.com> | 2019-04-04 17:14:12 -0700 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-04-08 14:13:06 +0700 |
| commit | fa28fd3421373794e98eb3e511969fea5a8b2fc3 (patch) | |
| tree | 0de45445102e0d2de55117b41540f39462e0df1a /drivers/spi/spi-tegra114.c | |
| parent | 9d199231b000414e420a35912760f2d67e9c56d7 (diff) | |
| download | linux-fa28fd3421373794e98eb3e511969fea5a8b2fc3.tar.bz2 | |
spi: tegra114: add support for interrupt mask
This patch creates tegra_spi_soc_data structure to maintain and implement
SPI HW feature differences between different Tegra chips and also creates
a separate compatible string for T124/T210.
Tegra210 and later has a separate interrupt mask register SPI_INTR_MASK
for enabling or disabling interrupts while Tegra124 and prior uses
interrupt enable bits in SPI_DMA_CTL register.
This patch creates flag has_intr_mask_reg in tegra_spi_soc_data to
identify this and implements accordingly.
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-tegra114.c')
| -rw-r--r-- | drivers/spi/spi-tegra114.c | 53 |
1 files changed, 48 insertions, 5 deletions
diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c index 751672b3bc16..b8c6393e2190 100644 --- a/drivers/spi/spi-tegra114.c +++ b/drivers/spi/spi-tegra114.c @@ -149,6 +149,8 @@ #define SPI_TX_FIFO 0x108 #define SPI_RX_FIFO 0x188 +#define SPI_INTR_MASK 0x18c +#define SPI_INTR_ALL_MASK (0x1fUL << 25) #define MAX_CHIP_SELECT 4 #define SPI_FIFO_DEPTH 64 #define DATA_DIR_TX (1 << 0) @@ -161,6 +163,10 @@ #define MAX_HOLD_CYCLES 16 #define SPI_DEFAULT_SPEED 25000000 +struct tegra_spi_soc_data { + bool has_intr_mask_reg; +}; + struct tegra_spi_data { struct device *dev; struct spi_master *master; @@ -211,6 +217,7 @@ struct tegra_spi_data { u32 *tx_dma_buf; dma_addr_t tx_dma_phys; struct dma_async_tx_descriptor *tx_dma_desc; + const struct tegra_spi_soc_data *soc_data; }; static int tegra_spi_runtime_suspend(struct device *dev); @@ -554,11 +561,13 @@ static int tegra_spi_start_dma_based_transfer( dma_burst = 8; } - if (tspi->cur_direction & DATA_DIR_TX) - val |= SPI_IE_TX; + if (!tspi->soc_data->has_intr_mask_reg) { + if (tspi->cur_direction & DATA_DIR_TX) + val |= SPI_IE_TX; - if (tspi->cur_direction & DATA_DIR_RX) - val |= SPI_IE_RX; + if (tspi->cur_direction & DATA_DIR_RX) + val |= SPI_IE_RX; + } tegra_spi_writel(tspi, val, SPI_DMA_CTL); tspi->dma_control_reg = val; @@ -847,6 +856,12 @@ static int tegra_spi_setup(struct spi_device *spi) return ret; } + if (tspi->soc_data->has_intr_mask_reg) { + val = tegra_spi_readl(tspi, SPI_INTR_MASK); + val &= ~SPI_INTR_ALL_MASK; + tegra_spi_writel(tspi, val, SPI_INTR_MASK); + } + spin_lock_irqsave(&tspi->lock, flags); val = tspi->def_command1_reg; if (spi->mode & SPI_CS_HIGH) @@ -1135,8 +1150,29 @@ static irqreturn_t tegra_spi_isr(int irq, void *context_data) return IRQ_WAKE_THREAD; } +static struct tegra_spi_soc_data tegra114_spi_soc_data = { + .has_intr_mask_reg = false, +}; + +static struct tegra_spi_soc_data tegra124_spi_soc_data = { + .has_intr_mask_reg = false, +}; + +static struct tegra_spi_soc_data tegra210_spi_soc_data = { + .has_intr_mask_reg = true, +}; + static const struct of_device_id tegra_spi_of_match[] = { - { .compatible = "nvidia,tegra114-spi", }, + { + .compatible = "nvidia,tegra114-spi", + .data = &tegra114_spi_soc_data, + }, { + .compatible = "nvidia,tegra124-spi", + .data = &tegra124_spi_soc_data, + }, { + .compatible = "nvidia,tegra210-spi", + .data = &tegra210_spi_soc_data, + }, {} }; MODULE_DEVICE_TABLE(of, tegra_spi_of_match); @@ -1177,6 +1213,13 @@ static int tegra_spi_probe(struct platform_device *pdev) tspi->dev = &pdev->dev; spin_lock_init(&tspi->lock); + tspi->soc_data = of_device_get_match_data(&pdev->dev); + if (!tspi->soc_data) { + dev_err(&pdev->dev, "unsupported tegra\n"); + ret = -ENODEV; + goto exit_free_master; + } + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); tspi->base = devm_ioremap_resource(&pdev->dev, r); if (IS_ERR(tspi->base)) { |