| Jan Glauber | 63d49af | 2016-07-23 12:42:54 +0200 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2011, 2012 Cavium, Inc. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/platform_device.h> |
| 10 | #include <linux/spi/spi.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/io.h> |
| 13 | #include <linux/of.h> |
| 14 | |
| 15 | #include <asm/octeon/octeon.h> |
| 16 | |
| 17 | #include "spi-cavium.h" |
| 18 | |
| 19 | static int octeon_spi_probe(struct platform_device *pdev) |
| 20 | { |
| 21 | struct resource *res_mem; |
| 22 | void __iomem *reg_base; |
| 23 | struct spi_master *master; |
| 24 | struct octeon_spi *p; |
| 25 | int err = -ENOENT; |
| 26 | |
| 27 | master = spi_alloc_master(&pdev->dev, sizeof(struct octeon_spi)); |
| 28 | if (!master) |
| 29 | return -ENOMEM; |
| 30 | p = spi_master_get_devdata(master); |
| 31 | platform_set_drvdata(pdev, master); |
| 32 | |
| 33 | res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 34 | reg_base = devm_ioremap_resource(&pdev->dev, res_mem); |
| 35 | if (IS_ERR(reg_base)) { |
| 36 | err = PTR_ERR(reg_base); |
| 37 | goto fail; |
| 38 | } |
| 39 | |
| 40 | p->register_base = reg_base; |
| 41 | p->sys_freq = octeon_get_io_clock_rate(); |
| 42 | |
| 43 | p->regs.config = 0; |
| 44 | p->regs.status = 0x08; |
| 45 | p->regs.tx = 0x10; |
| 46 | p->regs.data = 0x80; |
| 47 | |
| 48 | master->num_chipselect = 4; |
| 49 | master->mode_bits = SPI_CPHA | |
| 50 | SPI_CPOL | |
| 51 | SPI_CS_HIGH | |
| 52 | SPI_LSB_FIRST | |
| 53 | SPI_3WIRE; |
| 54 | |
| 55 | master->transfer_one_message = octeon_spi_transfer_one_message; |
| 56 | master->bits_per_word_mask = SPI_BPW_MASK(8); |
| 57 | master->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ; |
| 58 | |
| 59 | master->dev.of_node = pdev->dev.of_node; |
| 60 | err = devm_spi_register_master(&pdev->dev, master); |
| 61 | if (err) { |
| 62 | dev_err(&pdev->dev, "register master failed: %d\n", err); |
| 63 | goto fail; |
| 64 | } |
| 65 | |
| 66 | dev_info(&pdev->dev, "OCTEON SPI bus driver\n"); |
| 67 | |
| 68 | return 0; |
| 69 | fail: |
| 70 | spi_master_put(master); |
| 71 | return err; |
| 72 | } |
| 73 | |
| 74 | static int octeon_spi_remove(struct platform_device *pdev) |
| 75 | { |
| 76 | struct spi_master *master = platform_get_drvdata(pdev); |
| 77 | struct octeon_spi *p = spi_master_get_devdata(master); |
| 78 | |
| 79 | /* Clear the CSENA* and put everything in a known state. */ |
| 80 | writeq(0, p->register_base + OCTEON_SPI_CFG(p)); |
| 81 | |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | static const struct of_device_id octeon_spi_match[] = { |
| 86 | { .compatible = "cavium,octeon-3010-spi", }, |
| 87 | {}, |
| 88 | }; |
| 89 | MODULE_DEVICE_TABLE(of, octeon_spi_match); |
| 90 | |
| 91 | static struct platform_driver octeon_spi_driver = { |
| 92 | .driver = { |
| 93 | .name = "spi-octeon", |
| 94 | .of_match_table = octeon_spi_match, |
| 95 | }, |
| 96 | .probe = octeon_spi_probe, |
| 97 | .remove = octeon_spi_remove, |
| 98 | }; |
| 99 | |
| 100 | module_platform_driver(octeon_spi_driver); |
| 101 | |
| 102 | MODULE_DESCRIPTION("Cavium, Inc. OCTEON SPI bus driver"); |
| 103 | MODULE_AUTHOR("David Daney"); |
| 104 | MODULE_LICENSE("GPL"); |