134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Microchip KSZ8795 series register access through SPI
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*
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* Copyright (C) 2017 Microchip Technology Inc.
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* Tristram Ha <Tristram.Ha@microchip.com>
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*/
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#include <asm/unaligned.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#include "ksz8.h"
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#include "ksz_common.h"
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#define KSZ8795_SPI_ADDR_SHIFT 12
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#define KSZ8795_SPI_ADDR_ALIGN 3
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#define KSZ8795_SPI_TURNAROUND_SHIFT 1
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#define KSZ8863_SPI_ADDR_SHIFT 8
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#define KSZ8863_SPI_ADDR_ALIGN 8
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#define KSZ8863_SPI_TURNAROUND_SHIFT 0
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KSZ_REGMAP_TABLE(ksz8795, 16, KSZ8795_SPI_ADDR_SHIFT,
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KSZ8795_SPI_TURNAROUND_SHIFT, KSZ8795_SPI_ADDR_ALIGN);
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KSZ_REGMAP_TABLE(ksz8863, 16, KSZ8863_SPI_ADDR_SHIFT,
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KSZ8863_SPI_TURNAROUND_SHIFT, KSZ8863_SPI_ADDR_ALIGN);
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static int ksz8795_spi_probe(struct spi_device *spi)
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{
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const struct regmap_config *regmap_config;
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struct device *ddev = &spi->dev;
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struct regmap_config rc;
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struct ksz_device *dev;
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struct ksz8 *ksz8;
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int i, ret = 0;
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ksz8 = devm_kzalloc(&spi->dev, sizeof(struct ksz8), GFP_KERNEL);
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if (!ksz8)
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return -ENOMEM;
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ksz8->priv = spi;
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dev = ksz_switch_alloc(&spi->dev, ksz8);
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if (!dev)
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return -ENOMEM;
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regmap_config = device_get_match_data(ddev);
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if (!regmap_config)
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(ksz8795_regmap_config); i++) {
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rc = regmap_config[i];
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rc.lock_arg = &dev->regmap_mutex;
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dev->regmap[i] = devm_regmap_init_spi(spi, &rc);
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if (IS_ERR(dev->regmap[i])) {
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ret = PTR_ERR(dev->regmap[i]);
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dev_err(&spi->dev,
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"Failed to initialize regmap%i: %d\n",
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regmap_config[i].val_bits, ret);
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return ret;
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}
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}
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if (spi->dev.platform_data)
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dev->pdata = spi->dev.platform_data;
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/* setup spi */
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spi->mode = SPI_MODE_3;
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ret = spi_setup(spi);
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if (ret)
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return ret;
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ret = ksz8_switch_register(dev);
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/* Main DSA driver may not be started yet. */
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if (ret)
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return ret;
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spi_set_drvdata(spi, dev);
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return 0;
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}
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static int ksz8795_spi_remove(struct spi_device *spi)
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{
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struct ksz_device *dev = spi_get_drvdata(spi);
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if (dev)
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ksz_switch_remove(dev);
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return 0;
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}
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static void ksz8795_spi_shutdown(struct spi_device *spi)
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{
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struct ksz_device *dev = spi_get_drvdata(spi);
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if (dev && dev->dev_ops->shutdown)
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dev->dev_ops->shutdown(dev);
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}
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static const struct of_device_id ksz8795_dt_ids[] = {
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{ .compatible = "microchip,ksz8765", .data = &ksz8795_regmap_config },
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{ .compatible = "microchip,ksz8794", .data = &ksz8795_regmap_config },
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{ .compatible = "microchip,ksz8795", .data = &ksz8795_regmap_config },
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{ .compatible = "microchip,ksz8863", .data = &ksz8863_regmap_config },
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{ .compatible = "microchip,ksz8873", .data = &ksz8863_regmap_config },
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{},
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};
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MODULE_DEVICE_TABLE(of, ksz8795_dt_ids);
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static struct spi_driver ksz8795_spi_driver = {
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.driver = {
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.name = "ksz8795-switch",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(ksz8795_dt_ids),
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},
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.probe = ksz8795_spi_probe,
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.remove = ksz8795_spi_remove,
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.shutdown = ksz8795_spi_shutdown,
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};
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module_spi_driver(ksz8795_spi_driver);
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MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
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MODULE_DESCRIPTION("Microchip KSZ8795 Series Switch SPI Driver");
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MODULE_LICENSE("GPL");
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