/* * Cavium ThunderX SPI driver. * * Copyright (C) 2016 Cavium Inc. * Authors: Jan Glauber <jglauber@cavium.com> */ #include <linux/module.h> #include <linux/pci.h> #include <linux/spi/spi.h> #include "spi-cavium.h" #define DRV_NAME "spi-thunderx" #define SYS_FREQ_DEFAULT 700000000 /* 700 Mhz */ static int thunderx_spi_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { struct device *dev = &pdev->dev; struct spi_master *master; struct octeon_spi *p; int ret; master = spi_alloc_master(dev, sizeof(struct octeon_spi)); if (!master) return -ENOMEM; p = spi_master_get_devdata(master); ret = pcim_enable_device(pdev); if (ret) goto error; ret = pci_request_regions(pdev, DRV_NAME); if (ret) goto error; p->register_base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0)); if (!p->register_base) { ret = -EINVAL; goto error; } p->regs.config = 0x1000; p->regs.status = 0x1008; p->regs.tx = 0x1010; p->regs.data = 0x1080; p->clk = devm_clk_get(dev, NULL); if (IS_ERR(p->clk)) { ret = PTR_ERR(p->clk); goto error; } ret = clk_prepare_enable(p->clk); if (ret) goto error; p->sys_freq = clk_get_rate(p->clk); if (!p->sys_freq) p->sys_freq = SYS_FREQ_DEFAULT; dev_info(dev, "Set system clock to %u\n", p->sys_freq); master->num_chipselect = 4; master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | SPI_LSB_FIRST | SPI_3WIRE; master->transfer_one_message = octeon_spi_transfer_one_message; master->bits_per_word_mask = SPI_BPW_MASK(8); master->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ; master->dev.of_node = pdev->dev.of_node; pci_set_drvdata(pdev, master); ret = devm_spi_register_master(dev, master); if (ret) goto error; return 0; error: clk_disable_unprepare(p->clk); spi_master_put(master); return ret; } static void thunderx_spi_remove(struct pci_dev *pdev) { struct spi_master *master = pci_get_drvdata(pdev); struct octeon_spi *p; p = spi_master_get_devdata(master); if (!p) return; clk_disable_unprepare(p->clk); /* Put everything in a known state. */ writeq(0, p->register_base + OCTEON_SPI_CFG(p)); } static const struct pci_device_id thunderx_spi_pci_id_table[] = { { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa00b) }, { 0, } }; MODULE_DEVICE_TABLE(pci, thunderx_spi_pci_id_table); static struct pci_driver thunderx_spi_driver = { .name = DRV_NAME, .id_table = thunderx_spi_pci_id_table, .probe = thunderx_spi_probe, .remove = thunderx_spi_remove, }; module_pci_driver(thunderx_spi_driver); MODULE_DESCRIPTION("Cavium, Inc. ThunderX SPI bus driver"); MODULE_AUTHOR("Jan Glauber"); MODULE_LICENSE("GPL");