@@ -183,6 +183,9 @@ struct rockchip_spi {
u8 rsd;
bool cs_asserted[ROCKCHIP_SPI_MAX_CS_NUM];
+
+ bool slave_mode;
+ bool slave_abort;
};
static inline void spi_enable_chip(struct rockchip_spi *rs, bool enable)
@@ -359,7 +362,7 @@ static void rockchip_spi_dma_rxcb(void *data)
struct rockchip_spi *rs = spi_master_get_devdata(master);
int state = atomic_fetch_andnot(RXDMA, &rs->state);
- if (state & TXDMA)
+ if (state & TXDMA && !rs->slave_abort)
return;
spi_enable_chip(rs, false);
@@ -372,7 +375,7 @@ static void rockchip_spi_dma_txcb(void *data)
struct rockchip_spi *rs = spi_master_get_devdata(master);
int state = atomic_fetch_andnot(TXDMA, &rs->state);
- if (state & RXDMA)
+ if (state & RXDMA && !rs->slave_abort)
return;
/* Wait until the FIFO data completely. */
@@ -466,6 +469,10 @@ static void rockchip_spi_config(struct rockchip_spi *rs,
u32 cr1;
u32 dmacr = 0;
+ if (rs->slavemode)
+ cr0 |= CR0_OPM_SLAVE << CR0_OPM_OFFSET;
+ rs->slave_abort = false;
+
cr0 |= rs->rsd << CR0_RSD_OFFSET;
cr0 |= (spi->mode & 0x3U) << CR0_SCPH_OFFSET;
if (spi->mode & SPI_LSB_FIRST)
@@ -535,6 +542,16 @@ static size_t rockchip_spi_max_transfer_size(struct spi_device *spi)
return ROCKCHIP_SPI_MAX_TRANLEN;
}
+static int rockchip_spi_slave_abort(struct spi_master *master)
+{
+ struct rockchip_spi *rs = spi_master_get_devdata(master);
+
+ rs->slave_abort = true;
+ complete(master);
+
+ return 0;
+}
+
static int rockchip_spi_transfer_one(
struct spi_master *master,
struct spi_device *spi,
@@ -589,14 +606,25 @@ static int rockchip_spi_probe(struct platform_device *pdev)
struct spi_master *master;
struct resource *mem;
u32 rsd_nsecs;
+ bool slave_mode;
+ u32 num_cs = 1;
+
+ slave_mode = of_property_read_bool(np, "spi-slave");
+
+ if (slave_mode)
+ master = spi_alloc_slave(&pdev->dev,
+ sizeof(struct rockchip_spi));
+ else
+ master = spi_alloc_master(&pdev->dev,
+ sizeof(struct rockchip_spi));
- master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi));
if (!master)
return -ENOMEM;
platform_set_drvdata(pdev, master);
rs = spi_master_get_devdata(master);
+ rs->slave_mode = slave_mode;
/* Get basic io resource and map it */
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -676,7 +704,16 @@ static int rockchip_spi_probe(struct platform_device *pdev)
master->auto_runtime_pm = true;
master->bus_num = pdev->id;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP | SPI_LSB_FIRST;
- master->num_chipselect = ROCKCHIP_SPI_MAX_CS_NUM;
+ if (slave_mode) {
+ master->mode_bits |= SPI_NO_CS;
+ master->slave_abort = rockchip_spi_slave_abort;
+ } else {
+ of_property_read_u32(np, "num-cs", &num_cs);
+ master->num_chipselect = num_cs;
+ master->use_gpio_descriptors = true;
+ master->max_native_cs = ROCKCHIP_SPI_MAX_CS_NUM;
+ master->flags = SPI_MASTER_GPIO_SS;
+ }
master->dev.of_node = pdev->dev.of_node;
master->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8) | SPI_BPW_MASK(4);
master->min_speed_hz = rs->freq / BAUDR_SCKDV_MAX;
@@ -686,7 +723,6 @@ static int rockchip_spi_probe(struct platform_device *pdev)
master->transfer_one = rockchip_spi_transfer_one;
master->max_transfer_size = rockchip_spi_max_transfer_size;
master->handle_err = rockchip_spi_handle_err;
- master->flags = SPI_MASTER_GPIO_SS;
master->dma_tx = dma_request_chan(rs->dev, "tx");
if (IS_ERR(master->dma_tx)) {
This patch aim to add spi slave mode support to the rockchip driver. Fix the wrong usage of num_cs set fix to ROCKCHIP_SPI_MAX_CS_NUM, instead use max_native_cs flag to set the limit of native chip-select. Enable use_gpio_descriptors to have cs_gpiod for gpio based chip-selects. Signed-off-by: Chris Ruehl <chris.ruehl@gtsys.com.hk> --- drivers/spi/spi-rockchip.c | 46 +++++++++++++++++++++++++++++++++----- 1 file changed, 41 insertions(+), 5 deletions(-)