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 void __iomem *reg_base; 22 struct spi_master *master; 23 struct octeon_spi *p; 24 int err = -ENOENT; 25 26 master = spi_alloc_master(&pdev->dev, sizeof(struct octeon_spi)); 27 if (!master) 28 return -ENOMEM; 29 p = spi_master_get_devdata(master); 30 platform_set_drvdata(pdev, master); 31 32 reg_base = devm_platform_ioremap_resource(pdev, 0); 33 if (IS_ERR(reg_base)) { 34 err = PTR_ERR(reg_base); 35 goto fail; 36 } 37 38 p->register_base = reg_base; 39 p->sys_freq = octeon_get_io_clock_rate(); 40 41 p->regs.config = 0; 42 p->regs.status = 0x08; 43 p->regs.tx = 0x10; 44 p->regs.data = 0x80; 45 46 master->num_chipselect = 4; 47 master->mode_bits = SPI_CPHA | 48 SPI_CPOL | 49 SPI_CS_HIGH | 50 SPI_LSB_FIRST | 51 SPI_3WIRE; 52 53 master->transfer_one_message = octeon_spi_transfer_one_message; 54 master->bits_per_word_mask = SPI_BPW_MASK(8); 55 master->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ; 56 57 master->dev.of_node = pdev->dev.of_node; 58 err = devm_spi_register_master(&pdev->dev, master); 59 if (err) { 60 dev_err(&pdev->dev, "register master failed: %d\n", err); 61 goto fail; 62 } 63 64 dev_info(&pdev->dev, "OCTEON SPI bus driver\n"); 65 66 return 0; 67 fail: 68 spi_master_put(master); 69 return err; 70 } 71 72 static int octeon_spi_remove(struct platform_device *pdev) 73 { 74 struct spi_master *master = platform_get_drvdata(pdev); 75 struct octeon_spi *p = spi_master_get_devdata(master); 76 77 /* Clear the CSENA* and put everything in a known state. */ 78 writeq(0, p->register_base + OCTEON_SPI_CFG(p)); 79 80 return 0; 81 } 82 83 static const struct of_device_id octeon_spi_match[] = { 84 { .compatible = "cavium,octeon-3010-spi", }, 85 {}, 86 }; 87 MODULE_DEVICE_TABLE(of, octeon_spi_match); 88 89 static struct platform_driver octeon_spi_driver = { 90 .driver = { 91 .name = "spi-octeon", 92 .of_match_table = octeon_spi_match, 93 }, 94 .probe = octeon_spi_probe, 95 .remove = octeon_spi_remove, 96 }; 97 98 module_platform_driver(octeon_spi_driver); 99 100 MODULE_DESCRIPTION("Cavium, Inc. OCTEON SPI bus driver"); 101 MODULE_AUTHOR("David Daney"); 102 MODULE_LICENSE("GPL"); 103