// 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>");