Thomas Gleixner | 09c434b | 2019-05-19 13:08:20 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Jan Glauber | 7347a6c7 | 2016-08-19 16:03:20 +0200 | [diff] [blame] | 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_master *master; |
| 24 | struct octeon_spi *p; |
| 25 | int ret; |
| 26 | |
| 27 | master = spi_alloc_master(dev, sizeof(struct octeon_spi)); |
| 28 | if (!master) |
| 29 | return -ENOMEM; |
| 30 | |
| 31 | p = spi_master_get_devdata(master); |
| 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(dev, NULL); |
| 53 | if (IS_ERR(p->clk)) { |
| 54 | ret = PTR_ERR(p->clk); |
| 55 | goto error; |
| 56 | } |
| 57 | |
| 58 | ret = clk_prepare_enable(p->clk); |
| 59 | if (ret) |
| 60 | goto error; |
| 61 | |
| 62 | p->sys_freq = clk_get_rate(p->clk); |
| 63 | if (!p->sys_freq) |
| 64 | p->sys_freq = SYS_FREQ_DEFAULT; |
| 65 | dev_info(dev, "Set system clock to %u\n", p->sys_freq); |
| 66 | |
Tim Harvey | e8510d4 | 2020-05-28 08:46:39 -0700 | [diff] [blame] | 67 | master->flags = SPI_MASTER_HALF_DUPLEX; |
Jan Glauber | 7347a6c7 | 2016-08-19 16:03:20 +0200 | [diff] [blame] | 68 | master->num_chipselect = 4; |
| 69 | master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | |
| 70 | SPI_LSB_FIRST | SPI_3WIRE; |
| 71 | master->transfer_one_message = octeon_spi_transfer_one_message; |
| 72 | master->bits_per_word_mask = SPI_BPW_MASK(8); |
| 73 | master->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ; |
| 74 | master->dev.of_node = pdev->dev.of_node; |
| 75 | |
| 76 | pci_set_drvdata(pdev, master); |
| 77 | |
| 78 | ret = devm_spi_register_master(dev, master); |
| 79 | if (ret) |
| 80 | goto error; |
| 81 | |
| 82 | return 0; |
| 83 | |
| 84 | error: |
Wei Yongjun | 568852b | 2016-08-23 15:03:48 +0000 | [diff] [blame] | 85 | clk_disable_unprepare(p->clk); |
Chuhong Yuan | a841e28 | 2019-12-06 15:55:00 +0800 | [diff] [blame] | 86 | pci_release_regions(pdev); |
Jan Glauber | 7347a6c7 | 2016-08-19 16:03:20 +0200 | [diff] [blame] | 87 | spi_master_put(master); |
| 88 | return ret; |
| 89 | } |
| 90 | |
| 91 | static void thunderx_spi_remove(struct pci_dev *pdev) |
| 92 | { |
| 93 | struct spi_master *master = pci_get_drvdata(pdev); |
| 94 | struct octeon_spi *p; |
| 95 | |
| 96 | p = spi_master_get_devdata(master); |
| 97 | if (!p) |
| 98 | return; |
| 99 | |
Wei Yongjun | 568852b | 2016-08-23 15:03:48 +0000 | [diff] [blame] | 100 | clk_disable_unprepare(p->clk); |
Chuhong Yuan | a841e28 | 2019-12-06 15:55:00 +0800 | [diff] [blame] | 101 | pci_release_regions(pdev); |
Jan Glauber | 7347a6c7 | 2016-08-19 16:03:20 +0200 | [diff] [blame] | 102 | /* Put everything in a known state. */ |
| 103 | writeq(0, p->register_base + OCTEON_SPI_CFG(p)); |
| 104 | } |
| 105 | |
| 106 | static const struct pci_device_id thunderx_spi_pci_id_table[] = { |
| 107 | { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa00b) }, |
| 108 | { 0, } |
| 109 | }; |
| 110 | |
| 111 | MODULE_DEVICE_TABLE(pci, thunderx_spi_pci_id_table); |
| 112 | |
| 113 | static struct pci_driver thunderx_spi_driver = { |
| 114 | .name = DRV_NAME, |
| 115 | .id_table = thunderx_spi_pci_id_table, |
| 116 | .probe = thunderx_spi_probe, |
| 117 | .remove = thunderx_spi_remove, |
| 118 | }; |
| 119 | |
| 120 | module_pci_driver(thunderx_spi_driver); |
| 121 | |
| 122 | MODULE_DESCRIPTION("Cavium, Inc. ThunderX SPI bus driver"); |
| 123 | MODULE_AUTHOR("Jan Glauber"); |
| 124 | MODULE_LICENSE("GPL"); |