diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/spi/spi-pxa2xx.c | 110 |
2 files changed, 109 insertions, 3 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 8913d3dd5724..e79884e997ae 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -310,7 +310,7 @@ config SPI_PXA2XX_DMA config SPI_PXA2XX tristate "PXA2xx SSP SPI master" - depends on ARCH_PXA || PCI + depends on ARCH_PXA || PCI || ACPI select PXA_SSP if ARCH_PXA help This enables using a PXA2xx or Sodaville SSP port as a SPI master diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index 4bd6b729f710..90b27a3508a6 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -32,6 +32,7 @@ #include <linux/slab.h> #include <linux/clk.h> #include <linux/pm_runtime.h> +#include <linux/acpi.h> #include <asm/io.h> #include <asm/irq.h> @@ -933,6 +934,13 @@ static int setup(struct spi_device *spi) chip->dma_threshold = 0; if (chip_info->enable_loopback) chip->cr1 = SSCR1_LBM; + } else if (ACPI_HANDLE(&spi->dev)) { + /* + * Slave devices enumerated from ACPI namespace don't + * usually have chip_info but we still might want to use + * DMA with them. + */ + chip->enable_dma = drv_data->master_info->enable_dma; } chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) | @@ -1025,6 +1033,99 @@ static void cleanup(struct spi_device *spi) kfree(chip); } +#ifdef CONFIG_ACPI +static int pxa2xx_spi_acpi_add_dma(struct acpi_resource *res, void *data) +{ + struct pxa2xx_spi_master *pdata = data; + + if (res->type == ACPI_RESOURCE_TYPE_FIXED_DMA) { + const struct acpi_resource_fixed_dma *dma; + + dma = &res->data.fixed_dma; + if (pdata->tx_slave_id < 0) { + pdata->tx_slave_id = dma->request_lines; + pdata->tx_chan_id = dma->channels; + } else if (pdata->rx_slave_id < 0) { + pdata->rx_slave_id = dma->request_lines; + pdata->rx_chan_id = dma->channels; + } + } + + /* Tell the ACPI core to skip this resource */ + return 1; +} + +static struct pxa2xx_spi_master * +pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev) +{ + struct pxa2xx_spi_master *pdata; + struct list_head resource_list; + struct acpi_device *adev; + struct ssp_device *ssp; + struct resource *res; + int devid; + + if (!ACPI_HANDLE(&pdev->dev) || + acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev)) + return NULL; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*ssp), GFP_KERNEL); + if (!pdata) { + dev_err(&pdev->dev, + "failed to allocate memory for platform data\n"); + return NULL; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return NULL; + + ssp = &pdata->ssp; + + ssp->phys_base = res->start; + ssp->mmio_base = devm_request_and_ioremap(&pdev->dev, res); + if (!ssp->mmio_base) { + dev_err(&pdev->dev, "failed to ioremap mmio_base\n"); + return NULL; + } + + ssp->clk = devm_clk_get(&pdev->dev, NULL); + ssp->irq = platform_get_irq(pdev, 0); + ssp->type = LPSS_SSP; + ssp->pdev = pdev; + + ssp->port_id = -1; + if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0, &devid)) + ssp->port_id = devid; + + pdata->num_chipselect = 1; + pdata->rx_slave_id = -1; + pdata->tx_slave_id = -1; + + INIT_LIST_HEAD(&resource_list); + acpi_dev_get_resources(adev, &resource_list, pxa2xx_spi_acpi_add_dma, + pdata); + acpi_dev_free_resource_list(&resource_list); + + pdata->enable_dma = pdata->rx_slave_id >= 0 && pdata->tx_slave_id >= 0; + + return pdata; +} + +static struct acpi_device_id pxa2xx_spi_acpi_match[] = { + { "INT33C0", 0 }, + { "INT33C1", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match); +#else +static inline struct pxa2xx_spi_master * +pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev) +{ + return NULL; +} +#endif + static int pxa2xx_spi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -1036,8 +1137,11 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) platform_info = dev_get_platdata(dev); if (!platform_info) { - dev_err(&pdev->dev, "missing platform data\n"); - return -ENODEV; + platform_info = pxa2xx_spi_acpi_get_pdata(pdev); + if (!platform_info) { + dev_err(&pdev->dev, "missing platform data\n"); + return -ENODEV; + } } ssp = pxa_ssp_request(pdev->id, pdev->name); @@ -1064,6 +1168,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) master->dev.parent = &pdev->dev; master->dev.of_node = pdev->dev.of_node; + ACPI_HANDLE_SET(&master->dev, ACPI_HANDLE(&pdev->dev)); /* the spi->mode bits understood by this driver: */ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP; @@ -1272,6 +1377,7 @@ static struct platform_driver driver = { .name = "pxa2xx-spi", .owner = THIS_MODULE, .pm = &pxa2xx_spi_pm_ops, + .acpi_match_table = ACPI_PTR(pxa2xx_spi_acpi_match), }, .probe = pxa2xx_spi_probe, .remove = pxa2xx_spi_remove, |