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path: root/drivers/spi/spi-pxa2xx.c
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Diffstat (limited to 'drivers/spi/spi-pxa2xx.c')
-rw-r--r--drivers/spi/spi-pxa2xx.c109
1 files changed, 97 insertions, 12 deletions
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 612cc49db28f..d84b893a64d7 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -626,6 +626,11 @@ static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
return IRQ_HANDLED;
}
+ if (irq_status & SSSR_TUR) {
+ int_error_stop(drv_data, "interrupt_transfer: fifo underrun");
+ return IRQ_HANDLED;
+ }
+
if (irq_status & SSSR_TINT) {
pxa2xx_spi_write(drv_data, SSSR, SSSR_TINT);
if (drv_data->read(drv_data)) {
@@ -1073,6 +1078,30 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *master,
pxa2xx_spi_write(drv_data, SSTO, chip->timeout);
}
+ if (drv_data->ssp_type == MMP2_SSP) {
+ u8 tx_level = (pxa2xx_spi_read(drv_data, SSSR)
+ & SSSR_TFL_MASK) >> 8;
+
+ if (tx_level) {
+ /* On MMP2, flipping SSE doesn't to empty TXFIFO. */
+ dev_warn(&spi->dev, "%d bytes of garbage in TXFIFO!\n",
+ tx_level);
+ if (tx_level > transfer->len)
+ tx_level = transfer->len;
+ drv_data->tx += tx_level;
+ }
+ }
+
+ if (spi_controller_is_slave(master)) {
+ while (drv_data->write(drv_data))
+ ;
+ if (drv_data->gpiod_ready) {
+ gpiod_set_value(drv_data->gpiod_ready, 1);
+ udelay(1);
+ gpiod_set_value(drv_data->gpiod_ready, 0);
+ }
+ }
+
/*
* Release the data by enabling service requests and interrupts,
* without changing any mode bits
@@ -1082,6 +1111,27 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *master,
return 1;
}
+static int pxa2xx_spi_slave_abort(struct spi_master *master)
+{
+ struct driver_data *drv_data = spi_controller_get_devdata(master);
+
+ /* Stop and reset SSP */
+ write_SSSR_CS(drv_data, drv_data->clear_sr);
+ reset_sccr1(drv_data);
+ if (!pxa25x_ssp_comp(drv_data))
+ pxa2xx_spi_write(drv_data, SSTO, 0);
+ pxa2xx_spi_flush(drv_data);
+ pxa2xx_spi_write(drv_data, SSCR0,
+ pxa2xx_spi_read(drv_data, SSCR0) & ~SSCR0_SSE);
+
+ dev_dbg(&drv_data->pdev->dev, "transfer aborted\n");
+
+ drv_data->master->cur_msg->status = -EINTR;
+ spi_finalize_current_transfer(drv_data->master);
+
+ return 0;
+}
+
static void pxa2xx_spi_handle_err(struct spi_controller *master,
struct spi_message *msg)
{
@@ -1209,9 +1259,14 @@ static int setup(struct spi_device *spi)
rx_thres = config->rx_threshold;
break;
default:
- tx_thres = TX_THRESH_DFLT;
tx_hi_thres = 0;
- rx_thres = RX_THRESH_DFLT;
+ if (spi_controller_is_slave(drv_data->master)) {
+ tx_thres = 1;
+ rx_thres = 2;
+ } else {
+ tx_thres = TX_THRESH_DFLT;
+ rx_thres = RX_THRESH_DFLT;
+ }
break;
}
@@ -1255,6 +1310,12 @@ static int setup(struct spi_device *spi)
if (chip_info->enable_loopback)
chip->cr1 = SSCR1_LBM;
}
+ if (spi_controller_is_slave(drv_data->master)) {
+ chip->cr1 |= SSCR1_SCFR;
+ chip->cr1 |= SSCR1_SCLKDIR;
+ chip->cr1 |= SSCR1_SFRMDIR;
+ chip->cr1 |= SSCR1_SPH;
+ }
chip->lpss_rx_threshold = SSIRF_RxThresh(rx_thres);
chip->lpss_tx_threshold = SSITF_TxLoThresh(tx_thres)
@@ -1500,6 +1561,7 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
ssp->pdev = pdev;
ssp->port_id = pxa2xx_spi_get_port_id(adev);
+ pdata->is_slave = of_property_read_bool(pdev->dev.of_node, "spi-slave");
pdata->num_chipselect = 1;
pdata->enable_dma = true;
@@ -1559,7 +1621,11 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
return -ENODEV;
}
- master = spi_alloc_master(dev, sizeof(struct driver_data));
+ if (platform_info->is_slave)
+ master = spi_alloc_slave(dev, sizeof(struct driver_data));
+ else
+ master = spi_alloc_master(dev, sizeof(struct driver_data));
+
if (!master) {
dev_err(&pdev->dev, "cannot alloc spi_master\n");
pxa_ssp_free(ssp);
@@ -1581,6 +1647,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
master->setup = setup;
master->set_cs = pxa2xx_spi_set_cs;
master->transfer_one = pxa2xx_spi_transfer_one;
+ master->slave_abort = pxa2xx_spi_slave_abort;
master->handle_err = pxa2xx_spi_handle_err;
master->unprepare_transfer_hardware = pxa2xx_spi_unprepare_transfer;
master->fw_translate_cs = pxa2xx_spi_fw_translate_cs;
@@ -1610,7 +1677,8 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE;
drv_data->dma_cr1 = DEFAULT_DMA_CR1;
drv_data->clear_sr = SSSR_ROR | SSSR_TINT;
- drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR;
+ drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS
+ | SSSR_ROR | SSSR_TUR;
}
status = request_irq(ssp->irq, ssp_int, IRQF_SHARED, dev_name(dev),
@@ -1658,10 +1726,22 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
pxa2xx_spi_write(drv_data, SSCR0, tmp);
break;
default:
- tmp = SSCR1_RxTresh(RX_THRESH_DFLT) |
- SSCR1_TxTresh(TX_THRESH_DFLT);
+
+ if (spi_controller_is_slave(master)) {
+ tmp = SSCR1_SCFR |
+ SSCR1_SCLKDIR |
+ SSCR1_SFRMDIR |
+ SSCR1_RxTresh(2) |
+ SSCR1_TxTresh(1) |
+ SSCR1_SPH;
+ } else {
+ tmp = SSCR1_RxTresh(RX_THRESH_DFLT) |
+ SSCR1_TxTresh(TX_THRESH_DFLT);
+ }
pxa2xx_spi_write(drv_data, SSCR1, tmp);
- tmp = SSCR0_SCR(2) | SSCR0_Motorola | SSCR0_DataSize(8);
+ tmp = SSCR0_Motorola | SSCR0_DataSize(8);
+ if (!spi_controller_is_slave(master))
+ tmp |= SSCR0_SCR(2);
pxa2xx_spi_write(drv_data, SSCR0, tmp);
break;
}
@@ -1711,7 +1791,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
if (PTR_ERR(gpiod) == -ENOENT)
continue;
- status = (int)PTR_ERR(gpiod);
+ status = PTR_ERR(gpiod);
goto out_error_clock_enabled;
} else {
drv_data->cs_gpiods[i] = gpiod;
@@ -1719,6 +1799,15 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
}
}
+ if (platform_info->is_slave) {
+ drv_data->gpiod_ready = devm_gpiod_get_optional(dev,
+ "ready", GPIOD_OUT_LOW);
+ if (IS_ERR(drv_data->gpiod_ready)) {
+ status = PTR_ERR(drv_data->gpiod_ready);
+ goto out_error_clock_enabled;
+ }
+ }
+
pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
@@ -1811,10 +1900,6 @@ static int pxa2xx_spi_resume(struct device *dev)
return status;
}
- /* Restore LPSS private register bits */
- if (is_lpss_ssp(drv_data))
- lpss_ssp_setup(drv_data);
-
/* Start the queue running */
return spi_controller_resume(drv_data->master);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 09:15:44 +0100