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124 lines
2.7 KiB
124 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Cavium ThunderX SPI driver. |
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* |
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* Copyright (C) 2016 Cavium Inc. |
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* Authors: Jan Glauber <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/pci.h> |
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#include <linux/spi/spi.h> |
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#include "spi-cavium.h" |
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#define DRV_NAME "spi-thunderx" |
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#define SYS_FREQ_DEFAULT 700000000 /* 700 Mhz */ |
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static int thunderx_spi_probe(struct pci_dev *pdev, |
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const struct pci_device_id *ent) |
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{ |
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struct device *dev = &pdev->dev; |
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struct spi_master *master; |
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struct octeon_spi *p; |
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int ret; |
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master = spi_alloc_master(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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ret = pcim_enable_device(pdev); |
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if (ret) |
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goto error; |
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ret = pci_request_regions(pdev, DRV_NAME); |
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if (ret) |
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goto error; |
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p->register_base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0)); |
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if (!p->register_base) { |
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ret = -EINVAL; |
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goto error; |
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} |
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p->regs.config = 0x1000; |
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p->regs.status = 0x1008; |
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p->regs.tx = 0x1010; |
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p->regs.data = 0x1080; |
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p->clk = devm_clk_get(dev, NULL); |
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if (IS_ERR(p->clk)) { |
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ret = PTR_ERR(p->clk); |
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goto error; |
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} |
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ret = clk_prepare_enable(p->clk); |
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if (ret) |
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goto error; |
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p->sys_freq = clk_get_rate(p->clk); |
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if (!p->sys_freq) |
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p->sys_freq = SYS_FREQ_DEFAULT; |
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dev_info(dev, "Set system clock to %u\n", p->sys_freq); |
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master->flags = SPI_MASTER_HALF_DUPLEX; |
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master->num_chipselect = 4; |
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master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | |
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SPI_LSB_FIRST | 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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pci_set_drvdata(pdev, master); |
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ret = devm_spi_register_master(dev, master); |
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if (ret) |
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goto error; |
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return 0; |
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error: |
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clk_disable_unprepare(p->clk); |
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pci_release_regions(pdev); |
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spi_master_put(master); |
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return ret; |
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} |
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static void thunderx_spi_remove(struct pci_dev *pdev) |
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{ |
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struct spi_master *master = pci_get_drvdata(pdev); |
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struct octeon_spi *p; |
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p = spi_master_get_devdata(master); |
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if (!p) |
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return; |
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clk_disable_unprepare(p->clk); |
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pci_release_regions(pdev); |
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/* Put everything in a known state. */ |
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writeq(0, p->register_base + OCTEON_SPI_CFG(p)); |
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} |
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static const struct pci_device_id thunderx_spi_pci_id_table[] = { |
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{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa00b) }, |
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{ 0, } |
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}; |
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MODULE_DEVICE_TABLE(pci, thunderx_spi_pci_id_table); |
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static struct pci_driver thunderx_spi_driver = { |
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.name = DRV_NAME, |
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.id_table = thunderx_spi_pci_id_table, |
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.probe = thunderx_spi_probe, |
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.remove = thunderx_spi_remove, |
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}; |
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module_pci_driver(thunderx_spi_driver); |
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MODULE_DESCRIPTION("Cavium, Inc. ThunderX SPI bus driver"); |
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MODULE_AUTHOR("Jan Glauber"); |
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MODULE_LICENSE("GPL");
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