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- // 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 <[email protected]>");
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