spi/pxa2xx: add support for Lynxpoint SPI controllers
Intel Lynxpoint PCH Low Power Subsystem has two general purpose SPI controllers that are LPSS_SSP compatible. These controllers are enumerated from ACPI namespace with ACPI IDs INT33C0 and INT33C1. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Tested-by: Lu Cao <lucao@marvell.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>hifive-unleashed-5.1
Mika Westerberg
Mark Brown
parent
a0d2642e92
commit
a3496855d9
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -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,
|
||||
|
|
|
|||
Loading…
Reference in New Issue