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102 lines
2.4 KiB
102 lines
2.4 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 2011, 2012 Cavium, Inc. |
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*/ |
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#include <linux/platform_device.h> |
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#include <linux/spi/spi.h> |
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#include <linux/module.h> |
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#include <linux/io.h> |
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#include <linux/of.h> |
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#include <asm/octeon/octeon.h> |
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#include "spi-cavium.h" |
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static int octeon_spi_probe(struct platform_device *pdev) |
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{ |
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void __iomem *reg_base; |
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struct spi_master *master; |
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struct octeon_spi *p; |
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int err = -ENOENT; |
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master = spi_alloc_master(&pdev->dev, sizeof(struct octeon_spi)); |
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if (!master) |
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return -ENOMEM; |
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p = spi_master_get_devdata(master); |
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platform_set_drvdata(pdev, master); |
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reg_base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(reg_base)) { |
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err = PTR_ERR(reg_base); |
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goto fail; |
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} |
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p->register_base = reg_base; |
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p->sys_freq = octeon_get_io_clock_rate(); |
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p->regs.config = 0; |
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p->regs.status = 0x08; |
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p->regs.tx = 0x10; |
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p->regs.data = 0x80; |
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master->num_chipselect = 4; |
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master->mode_bits = SPI_CPHA | |
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SPI_CPOL | |
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SPI_CS_HIGH | |
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SPI_LSB_FIRST | |
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SPI_3WIRE; |
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master->transfer_one_message = octeon_spi_transfer_one_message; |
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master->bits_per_word_mask = SPI_BPW_MASK(8); |
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master->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ; |
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master->dev.of_node = pdev->dev.of_node; |
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err = devm_spi_register_master(&pdev->dev, master); |
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if (err) { |
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dev_err(&pdev->dev, "register master failed: %d\n", err); |
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goto fail; |
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} |
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dev_info(&pdev->dev, "OCTEON SPI bus driver\n"); |
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return 0; |
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fail: |
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spi_master_put(master); |
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return err; |
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} |
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static int octeon_spi_remove(struct platform_device *pdev) |
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{ |
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struct spi_master *master = platform_get_drvdata(pdev); |
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struct octeon_spi *p = spi_master_get_devdata(master); |
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/* Clear the CSENA* and put everything in a known state. */ |
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writeq(0, p->register_base + OCTEON_SPI_CFG(p)); |
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return 0; |
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} |
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static const struct of_device_id octeon_spi_match[] = { |
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{ .compatible = "cavium,octeon-3010-spi", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, octeon_spi_match); |
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static struct platform_driver octeon_spi_driver = { |
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.driver = { |
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.name = "spi-octeon", |
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.of_match_table = octeon_spi_match, |
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}, |
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.probe = octeon_spi_probe, |
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.remove = octeon_spi_remove, |
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}; |
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module_platform_driver(octeon_spi_driver); |
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MODULE_DESCRIPTION("Cavium, Inc. OCTEON SPI bus driver"); |
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MODULE_AUTHOR("David Daney"); |
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MODULE_LICENSE("GPL");
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