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>

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,