1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 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 19 static 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 80 error: 81 pci_release_regions(pdev); 82 spi_controller_put(host); 83 return ret; 84 } 85 86 static 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 } 99 100 static const struct pci_device_id thunderx_spi_pci_id_table[] = { 101 { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa00b) }, 102 { 0, } 103 }; 104 105 MODULE_DEVICE_TABLE(pci, thunderx_spi_pci_id_table); 106 107 static 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 }; 113 114 module_pci_driver(thunderx_spi_driver); 115 116 MODULE_DESCRIPTION("Cavium, Inc. ThunderX SPI bus driver"); 117 MODULE_AUTHOR("Jan Glauber"); 118 MODULE_LICENSE("GPL"); 119