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path: root/drivers/spi/spi-pxa2xx-pci.c
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Diffstat (limited to 'drivers/spi/spi-pxa2xx-pci.c')
-rw-r--r--drivers/spi/spi-pxa2xx-pci.c326
1 files changed, 326 insertions, 0 deletions
diff --git a/drivers/spi/spi-pxa2xx-pci.c b/drivers/spi/spi-pxa2xx-pci.c
new file mode 100644
index 000000000..54e316eb0
--- /dev/null
+++ b/drivers/spi/spi-pxa2xx-pci.c
@@ -0,0 +1,326 @@
+/*
+ * CE4100's SPI device is more or less the same one as found on PXA
+ *
+ * Copyright (C) 2016, Intel Corporation
+ */
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/spi/pxa2xx_spi.h>
+
+#include <linux/dmaengine.h>
+#include <linux/platform_data/dma-dw.h>
+
+enum {
+ PORT_QUARK_X1000,
+ PORT_BYT,
+ PORT_MRFLD,
+ PORT_BSW0,
+ PORT_BSW1,
+ PORT_BSW2,
+ PORT_CE4100,
+ PORT_LPT0,
+ PORT_LPT1,
+};
+
+struct pxa_spi_info {
+ enum pxa_ssp_type type;
+ int port_id;
+ int num_chipselect;
+ unsigned long max_clk_rate;
+
+ /* DMA channel request parameters */
+ bool (*dma_filter)(struct dma_chan *chan, void *param);
+ void *tx_param;
+ void *rx_param;
+
+ int (*setup)(struct pci_dev *pdev, struct pxa_spi_info *c);
+};
+
+static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
+static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
+
+static struct dw_dma_slave mrfld3_tx_param = { .dst_id = 15 };
+static struct dw_dma_slave mrfld3_rx_param = { .src_id = 14 };
+static struct dw_dma_slave mrfld5_tx_param = { .dst_id = 13 };
+static struct dw_dma_slave mrfld5_rx_param = { .src_id = 12 };
+static struct dw_dma_slave mrfld6_tx_param = { .dst_id = 11 };
+static struct dw_dma_slave mrfld6_rx_param = { .src_id = 10 };
+
+static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
+static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
+static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
+static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
+static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
+static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
+
+static struct dw_dma_slave lpt1_tx_param = { .dst_id = 0 };
+static struct dw_dma_slave lpt1_rx_param = { .src_id = 1 };
+static struct dw_dma_slave lpt0_tx_param = { .dst_id = 2 };
+static struct dw_dma_slave lpt0_rx_param = { .src_id = 3 };
+
+static bool lpss_dma_filter(struct dma_chan *chan, void *param)
+{
+ struct dw_dma_slave *dws = param;
+
+ if (dws->dma_dev != chan->device->dev)
+ return false;
+
+ chan->private = dws;
+ return true;
+}
+
+static void lpss_dma_put_device(void *dma_dev)
+{
+ pci_dev_put(dma_dev);
+}
+
+static int lpss_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
+{
+ struct pci_dev *dma_dev;
+ int ret;
+
+ c->num_chipselect = 1;
+ c->max_clk_rate = 50000000;
+
+ dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
+ ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev);
+ if (ret)
+ return ret;
+
+ if (c->tx_param) {
+ struct dw_dma_slave *slave = c->tx_param;
+
+ slave->dma_dev = &dma_dev->dev;
+ slave->m_master = 0;
+ slave->p_master = 1;
+ }
+
+ if (c->rx_param) {
+ struct dw_dma_slave *slave = c->rx_param;
+
+ slave->dma_dev = &dma_dev->dev;
+ slave->m_master = 0;
+ slave->p_master = 1;
+ }
+
+ c->dma_filter = lpss_dma_filter;
+ return 0;
+}
+
+static int mrfld_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
+{
+ struct dw_dma_slave *tx, *rx;
+ struct pci_dev *dma_dev;
+ int ret;
+
+ switch (PCI_FUNC(dev->devfn)) {
+ case 0:
+ c->port_id = 3;
+ c->num_chipselect = 1;
+ c->tx_param = &mrfld3_tx_param;
+ c->rx_param = &mrfld3_rx_param;
+ break;
+ case 1:
+ c->port_id = 5;
+ c->num_chipselect = 4;
+ c->tx_param = &mrfld5_tx_param;
+ c->rx_param = &mrfld5_rx_param;
+ break;
+ case 2:
+ c->port_id = 6;
+ c->num_chipselect = 1;
+ c->tx_param = &mrfld6_tx_param;
+ c->rx_param = &mrfld6_rx_param;
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(21, 0));
+ ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev);
+ if (ret)
+ return ret;
+
+ tx = c->tx_param;
+ tx->dma_dev = &dma_dev->dev;
+
+ rx = c->rx_param;
+ rx->dma_dev = &dma_dev->dev;
+
+ c->dma_filter = lpss_dma_filter;
+ return 0;
+}
+
+static struct pxa_spi_info spi_info_configs[] = {
+ [PORT_CE4100] = {
+ .type = PXA25x_SSP,
+ .port_id = -1,
+ .num_chipselect = -1,
+ .max_clk_rate = 3686400,
+ },
+ [PORT_BYT] = {
+ .type = LPSS_BYT_SSP,
+ .port_id = 0,
+ .setup = lpss_spi_setup,
+ .tx_param = &byt_tx_param,
+ .rx_param = &byt_rx_param,
+ },
+ [PORT_BSW0] = {
+ .type = LPSS_BSW_SSP,
+ .port_id = 0,
+ .setup = lpss_spi_setup,
+ .tx_param = &bsw0_tx_param,
+ .rx_param = &bsw0_rx_param,
+ },
+ [PORT_BSW1] = {
+ .type = LPSS_BSW_SSP,
+ .port_id = 1,
+ .setup = lpss_spi_setup,
+ .tx_param = &bsw1_tx_param,
+ .rx_param = &bsw1_rx_param,
+ },
+ [PORT_BSW2] = {
+ .type = LPSS_BSW_SSP,
+ .port_id = 2,
+ .setup = lpss_spi_setup,
+ .tx_param = &bsw2_tx_param,
+ .rx_param = &bsw2_rx_param,
+ },
+ [PORT_MRFLD] = {
+ .type = PXA27x_SSP,
+ .max_clk_rate = 25000000,
+ .setup = mrfld_spi_setup,
+ },
+ [PORT_QUARK_X1000] = {
+ .type = QUARK_X1000_SSP,
+ .port_id = -1,
+ .num_chipselect = 1,
+ .max_clk_rate = 50000000,
+ },
+ [PORT_LPT0] = {
+ .type = LPSS_LPT_SSP,
+ .port_id = 0,
+ .setup = lpss_spi_setup,
+ .tx_param = &lpt0_tx_param,
+ .rx_param = &lpt0_rx_param,
+ },
+ [PORT_LPT1] = {
+ .type = LPSS_LPT_SSP,
+ .port_id = 1,
+ .setup = lpss_spi_setup,
+ .tx_param = &lpt1_tx_param,
+ .rx_param = &lpt1_rx_param,
+ },
+};
+
+static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
+ const struct pci_device_id *ent)
+{
+ struct platform_device_info pi;
+ int ret;
+ struct platform_device *pdev;
+ struct pxa2xx_spi_master spi_pdata;
+ struct ssp_device *ssp;
+ struct pxa_spi_info *c;
+ char buf[40];
+
+ ret = pcim_enable_device(dev);
+ if (ret)
+ return ret;
+
+ ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
+ if (ret)
+ return ret;
+
+ c = &spi_info_configs[ent->driver_data];
+ if (c->setup) {
+ ret = c->setup(dev, c);
+ if (ret)
+ return ret;
+ }
+
+ memset(&spi_pdata, 0, sizeof(spi_pdata));
+ spi_pdata.num_chipselect = (c->num_chipselect > 0) ? c->num_chipselect : dev->devfn;
+ spi_pdata.dma_filter = c->dma_filter;
+ spi_pdata.tx_param = c->tx_param;
+ spi_pdata.rx_param = c->rx_param;
+ spi_pdata.enable_dma = c->rx_param && c->tx_param;
+
+ ssp = &spi_pdata.ssp;
+ ssp->phys_base = pci_resource_start(dev, 0);
+ ssp->mmio_base = pcim_iomap_table(dev)[0];
+ ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
+ ssp->type = c->type;
+
+ pci_set_master(dev);
+
+ ret = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES);
+ if (ret < 0)
+ return ret;
+ ssp->irq = pci_irq_vector(dev, 0);
+
+ snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
+ ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL, 0,
+ c->max_clk_rate);
+ if (IS_ERR(ssp->clk))
+ return PTR_ERR(ssp->clk);
+
+ memset(&pi, 0, sizeof(pi));
+ pi.fwnode = dev->dev.fwnode;
+ pi.parent = &dev->dev;
+ pi.name = "pxa2xx-spi";
+ pi.id = ssp->port_id;
+ pi.data = &spi_pdata;
+ pi.size_data = sizeof(spi_pdata);
+
+ pdev = platform_device_register_full(&pi);
+ if (IS_ERR(pdev)) {
+ clk_unregister(ssp->clk);
+ return PTR_ERR(pdev);
+ }
+
+ pci_set_drvdata(dev, pdev);
+
+ return 0;
+}
+
+static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
+{
+ struct platform_device *pdev = pci_get_drvdata(dev);
+ struct pxa2xx_spi_master *spi_pdata;
+
+ spi_pdata = dev_get_platdata(&pdev->dev);
+
+ platform_device_unregister(pdev);
+ clk_unregister(spi_pdata->ssp.clk);
+}
+
+static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
+ { PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
+ { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
+ { PCI_VDEVICE(INTEL, 0x1194), PORT_MRFLD },
+ { PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
+ { PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
+ { PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
+ { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
+ { PCI_VDEVICE(INTEL, 0x9ce5), PORT_LPT0 },
+ { PCI_VDEVICE(INTEL, 0x9ce6), PORT_LPT1 },
+ { }
+};
+MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
+
+static struct pci_driver pxa2xx_spi_pci_driver = {
+ .name = "pxa2xx_spi_pci",
+ .id_table = pxa2xx_spi_pci_devices,
+ .probe = pxa2xx_spi_pci_probe,
+ .remove = pxa2xx_spi_pci_remove,
+};
+
+module_pci_driver(pxa2xx_spi_pci_driver);
+
+MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
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