119 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Cavium ThunderX SPI driver.4 *5 * Copyright (C) 2016 Cavium Inc.6 * Authors: Jan Glauber <jglauber@cavium.com>7 */8 9#include <linux/module.h>10#include <linux/pci.h>11#include <linux/spi/spi.h>12 13#include "spi-cavium.h"14 15#define DRV_NAME "spi-thunderx"16 17#define SYS_FREQ_DEFAULT 700000000 /* 700 Mhz */18 19static int thunderx_spi_probe(struct pci_dev *pdev,20 const struct pci_device_id *ent)21{22 struct device *dev = &pdev->dev;23 struct spi_controller *host;24 struct octeon_spi *p;25 int ret;26 27 host = spi_alloc_host(dev, sizeof(struct octeon_spi));28 if (!host)29 return -ENOMEM;30 31 p = spi_controller_get_devdata(host);32 33 ret = pcim_enable_device(pdev);34 if (ret)35 goto error;36 37 ret = pci_request_regions(pdev, DRV_NAME);38 if (ret)39 goto error;40 41 p->register_base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));42 if (!p->register_base) {43 ret = -EINVAL;44 goto error;45 }46 47 p->regs.config = 0x1000;48 p->regs.status = 0x1008;49 p->regs.tx = 0x1010;50 p->regs.data = 0x1080;51 52 p->clk = devm_clk_get_enabled(dev, NULL);53 if (IS_ERR(p->clk)) {54 ret = PTR_ERR(p->clk);55 goto error;56 }57 58 p->sys_freq = clk_get_rate(p->clk);59 if (!p->sys_freq)60 p->sys_freq = SYS_FREQ_DEFAULT;61 dev_info(dev, "Set system clock to %u\n", p->sys_freq);62 63 host->flags = SPI_CONTROLLER_HALF_DUPLEX;64 host->num_chipselect = 4;65 host->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH |66 SPI_LSB_FIRST | SPI_3WIRE;67 host->transfer_one_message = octeon_spi_transfer_one_message;68 host->bits_per_word_mask = SPI_BPW_MASK(8);69 host->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ;70 host->dev.of_node = pdev->dev.of_node;71 72 pci_set_drvdata(pdev, host);73 74 ret = devm_spi_register_controller(dev, host);75 if (ret)76 goto error;77 78 return 0;79 80error:81 pci_release_regions(pdev);82 spi_controller_put(host);83 return ret;84}85 86static void thunderx_spi_remove(struct pci_dev *pdev)87{88 struct spi_controller *host = pci_get_drvdata(pdev);89 struct octeon_spi *p;90 91 p = spi_controller_get_devdata(host);92 if (!p)93 return;94 95 pci_release_regions(pdev);96 /* Put everything in a known state. */97 writeq(0, p->register_base + OCTEON_SPI_CFG(p));98}99 100static const struct pci_device_id thunderx_spi_pci_id_table[] = {101 { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa00b) },102 { 0, }103};104 105MODULE_DEVICE_TABLE(pci, thunderx_spi_pci_id_table);106 107static struct pci_driver thunderx_spi_driver = {108 .name = DRV_NAME,109 .id_table = thunderx_spi_pci_id_table,110 .probe = thunderx_spi_probe,111 .remove = thunderx_spi_remove,112};113 114module_pci_driver(thunderx_spi_driver);115 116MODULE_DESCRIPTION("Cavium, Inc. ThunderX SPI bus driver");117MODULE_AUTHOR("Jan Glauber");118MODULE_LICENSE("GPL");119