1 files changed, 346 insertions, 0 deletions

diff --git a/drivers/spi/spi-pxa2xx-pci.c b/drivers/spi/spi-pxa2xx-pci.c
new file mode 100644
index 0000000000..861b21c635
--- /dev/null
+++ b/drivers/spi/spi-pxa2xx-pci.c
@@ -0,0 +1,346 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PCI glue driver for SPI PXA2xx compatible controllers.
+ * CE4100's SPI device is more or less the same one as found on PXA.
+ *
+ * Copyright (C) 2016, 2021 Intel Corporation
+ */
+#include <linux/clk-provider.h>
+#include <linux/module.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>
+
+#define PCI_DEVICE_ID_INTEL_QUARK_X1000		0x0935
+#define PCI_DEVICE_ID_INTEL_BYT			0x0f0e
+#define PCI_DEVICE_ID_INTEL_MRFLD		0x1194
+#define PCI_DEVICE_ID_INTEL_BSW0		0x228e
+#define PCI_DEVICE_ID_INTEL_BSW1		0x2290
+#define PCI_DEVICE_ID_INTEL_BSW2		0x22ac
+#define PCI_DEVICE_ID_INTEL_CE4100		0x2e6a
+#define PCI_DEVICE_ID_INTEL_LPT0_0		0x9c65
+#define PCI_DEVICE_ID_INTEL_LPT0_1		0x9c66
+#define PCI_DEVICE_ID_INTEL_LPT1_0		0x9ce5
+#define PCI_DEVICE_ID_INTEL_LPT1_1		0x9ce6
+
+struct pxa_spi_info {
+	int (*setup)(struct pci_dev *pdev, struct pxa2xx_spi_controller *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 void pxa2xx_spi_pci_clk_unregister(void *clk)
+{
+	clk_unregister(clk);
+}
+
+static int pxa2xx_spi_pci_clk_register(struct pci_dev *dev, struct ssp_device *ssp,
+				       unsigned long rate)
+{
+	char buf[40];
+
+	snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
+	ssp->clk = clk_register_fixed_rate(&dev->dev, buf, NULL, 0, rate);
+	if (IS_ERR(ssp->clk))
+		return PTR_ERR(ssp->clk);
+
+	return devm_add_action_or_reset(&dev->dev, pxa2xx_spi_pci_clk_unregister, ssp->clk);
+}
+
+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 pxa2xx_spi_controller *c)
+{
+	struct ssp_device *ssp = &c->ssp;
+	struct dw_dma_slave *tx, *rx;
+	struct pci_dev *dma_dev;
+	int ret;
+
+	switch (dev->device) {
+	case PCI_DEVICE_ID_INTEL_BYT:
+		ssp->type = LPSS_BYT_SSP;
+		ssp->port_id = 0;
+		c->tx_param = &byt_tx_param;
+		c->rx_param = &byt_rx_param;
+		break;
+	case PCI_DEVICE_ID_INTEL_BSW0:
+		ssp->type = LPSS_BSW_SSP;
+		ssp->port_id = 0;
+		c->tx_param = &bsw0_tx_param;
+		c->rx_param = &bsw0_rx_param;
+		break;
+	case PCI_DEVICE_ID_INTEL_BSW1:
+		ssp->type = LPSS_BSW_SSP;
+		ssp->port_id = 1;
+		c->tx_param = &bsw1_tx_param;
+		c->rx_param = &bsw1_rx_param;
+		break;
+	case PCI_DEVICE_ID_INTEL_BSW2:
+		ssp->type = LPSS_BSW_SSP;
+		ssp->port_id = 2;
+		c->tx_param = &bsw2_tx_param;
+		c->rx_param = &bsw2_rx_param;
+		break;
+	case PCI_DEVICE_ID_INTEL_LPT0_0:
+	case PCI_DEVICE_ID_INTEL_LPT1_0:
+		ssp->type = LPSS_LPT_SSP;
+		ssp->port_id = 0;
+		c->tx_param = &lpt0_tx_param;
+		c->rx_param = &lpt0_rx_param;
+		break;
+	case PCI_DEVICE_ID_INTEL_LPT0_1:
+	case PCI_DEVICE_ID_INTEL_LPT1_1:
+		ssp->type = LPSS_LPT_SSP;
+		ssp->port_id = 1;
+		c->tx_param = &lpt1_tx_param;
+		c->rx_param = &lpt1_rx_param;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	c->num_chipselect = 1;
+
+	ret = pxa2xx_spi_pci_clk_register(dev, ssp, 50000000);
+	if (ret)
+		return ret;
+
+	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;
+
+	tx = c->tx_param;
+	tx->dma_dev = &dma_dev->dev;
+	tx->m_master = 0;
+	tx->p_master = 1;
+
+	rx = c->rx_param;
+	rx->dma_dev = &dma_dev->dev;
+	rx->m_master = 0;
+	rx->p_master = 1;
+
+	c->dma_filter = lpss_dma_filter;
+	c->dma_burst_size = 1;
+	c->enable_dma = 1;
+	return 0;
+}
+
+static const struct pxa_spi_info lpss_info_config = {
+	.setup = lpss_spi_setup,
+};
+
+static int ce4100_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c)
+{
+	struct ssp_device *ssp = &c->ssp;
+
+	ssp->type = PXA25x_SSP;
+	ssp->port_id = dev->devfn;
+	c->num_chipselect = dev->devfn;
+
+	return pxa2xx_spi_pci_clk_register(dev, ssp, 3686400);
+}
+
+static const struct pxa_spi_info ce4100_info_config = {
+	.setup = ce4100_spi_setup,
+};
+
+static int mrfld_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c)
+{
+	struct ssp_device *ssp = &c->ssp;
+	struct dw_dma_slave *tx, *rx;
+	struct pci_dev *dma_dev;
+	int ret;
+
+	ssp->type = MRFLD_SSP;
+
+	switch (PCI_FUNC(dev->devfn)) {
+	case 0:
+		ssp->port_id = 3;
+		c->num_chipselect = 1;
+		c->tx_param = &mrfld3_tx_param;
+		c->rx_param = &mrfld3_rx_param;
+		break;
+	case 1:
+		ssp->port_id = 5;
+		c->num_chipselect = 4;
+		c->tx_param = &mrfld5_tx_param;
+		c->rx_param = &mrfld5_rx_param;
+		break;
+	case 2:
+		ssp->port_id = 6;
+		c->num_chipselect = 1;
+		c->tx_param = &mrfld6_tx_param;
+		c->rx_param = &mrfld6_rx_param;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	ret = pxa2xx_spi_pci_clk_register(dev, ssp, 25000000);
+	if (ret)
+		return ret;
+
+	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;
+	c->dma_burst_size = 8;
+	c->enable_dma = 1;
+	return 0;
+}
+
+static const struct pxa_spi_info mrfld_info_config = {
+	.setup = mrfld_spi_setup,
+};
+
+static int qrk_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c)
+{
+	struct ssp_device *ssp = &c->ssp;
+
+	ssp->type = QUARK_X1000_SSP;
+	ssp->port_id = dev->devfn;
+	c->num_chipselect = 1;
+
+	return pxa2xx_spi_pci_clk_register(dev, ssp, 50000000);
+}
+
+static const struct pxa_spi_info qrk_info_config = {
+	.setup = qrk_spi_setup,
+};
+
+static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
+		const struct pci_device_id *ent)
+{
+	const struct pxa_spi_info *info;
+	struct platform_device_info pi;
+	int ret;
+	struct platform_device *pdev;
+	struct pxa2xx_spi_controller spi_pdata;
+	struct ssp_device *ssp;
+
+	ret = pcim_enable_device(dev);
+	if (ret)
+		return ret;
+
+	ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
+	if (ret)
+		return ret;
+
+	memset(&spi_pdata, 0, sizeof(spi_pdata));
+
+	ssp = &spi_pdata.ssp;
+	ssp->dev = &dev->dev;
+	ssp->phys_base = pci_resource_start(dev, 0);
+	ssp->mmio_base = pcim_iomap_table(dev)[0];
+
+	info = (struct pxa_spi_info *)ent->driver_data;
+	ret = info->setup(dev, &spi_pdata);
+	if (ret)
+		return ret;
+
+	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);
+
+	memset(&pi, 0, sizeof(pi));
+	pi.fwnode = dev_fwnode(&dev->dev);
+	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))
+		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);
+
+	platform_device_unregister(pdev);
+}
+
+static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
+	{ PCI_DEVICE_DATA(INTEL, QUARK_X1000, &qrk_info_config) },
+	{ PCI_DEVICE_DATA(INTEL, BYT, &lpss_info_config) },
+	{ PCI_DEVICE_DATA(INTEL, MRFLD, &mrfld_info_config) },
+	{ PCI_DEVICE_DATA(INTEL, BSW0, &lpss_info_config) },
+	{ PCI_DEVICE_DATA(INTEL, BSW1, &lpss_info_config) },
+	{ PCI_DEVICE_DATA(INTEL, BSW2, &lpss_info_config) },
+	{ PCI_DEVICE_DATA(INTEL, CE4100, &ce4100_info_config) },
+	{ PCI_DEVICE_DATA(INTEL, LPT0_0, &lpss_info_config) },
+	{ PCI_DEVICE_DATA(INTEL, LPT0_1, &lpss_info_config) },
+	{ PCI_DEVICE_DATA(INTEL, LPT1_0, &lpss_info_config) },
+	{ PCI_DEVICE_DATA(INTEL, LPT1_1, &lpss_info_config) },
+	{ }
+};
+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>");