123 lines
2.6 KiB
C
123 lines
2.6 KiB
C
/*
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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 <jglauber@cavium.com>
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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->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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