178 lines
3.8 KiB
C
178 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Microchip KSZ9477 series register access through SPI
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*
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* Copyright (C) 2017-2018 Microchip Technology Inc.
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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/spi/spi.h>
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#include "ksz_priv.h"
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#include "ksz_spi.h"
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/* SPI frame opcodes */
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#define KS_SPIOP_RD 3
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#define KS_SPIOP_WR 2
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#define SPI_ADDR_SHIFT 24
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#define SPI_ADDR_MASK (BIT(SPI_ADDR_SHIFT) - 1)
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#define SPI_TURNAROUND_SHIFT 5
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/* Enough to read all switch port registers. */
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#define SPI_TX_BUF_LEN 0x100
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static int ksz9477_spi_read_reg(struct spi_device *spi, u32 reg, u8 *val,
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unsigned int len)
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{
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u32 txbuf;
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int ret;
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txbuf = reg & SPI_ADDR_MASK;
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txbuf |= KS_SPIOP_RD << SPI_ADDR_SHIFT;
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txbuf <<= SPI_TURNAROUND_SHIFT;
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txbuf = cpu_to_be32(txbuf);
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ret = spi_write_then_read(spi, &txbuf, 4, val, len);
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return ret;
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}
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static int ksz9477_spi_write_reg(struct spi_device *spi, u32 reg, u8 *val,
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unsigned int len)
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{
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u32 *txbuf = (u32 *)val;
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*txbuf = reg & SPI_ADDR_MASK;
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*txbuf |= (KS_SPIOP_WR << SPI_ADDR_SHIFT);
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*txbuf <<= SPI_TURNAROUND_SHIFT;
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*txbuf = cpu_to_be32(*txbuf);
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return spi_write(spi, txbuf, 4 + len);
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}
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static int ksz_spi_read(struct ksz_device *dev, u32 reg, u8 *data,
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unsigned int len)
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{
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struct spi_device *spi = dev->priv;
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return ksz9477_spi_read_reg(spi, reg, data, len);
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}
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static int ksz_spi_write(struct ksz_device *dev, u32 reg, void *data,
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unsigned int len)
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{
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struct spi_device *spi = dev->priv;
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if (len > SPI_TX_BUF_LEN)
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len = SPI_TX_BUF_LEN;
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memcpy(&dev->txbuf[4], data, len);
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return ksz9477_spi_write_reg(spi, reg, dev->txbuf, len);
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}
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static int ksz_spi_read24(struct ksz_device *dev, u32 reg, u32 *val)
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{
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int ret;
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*val = 0;
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ret = ksz_spi_read(dev, reg, (u8 *)val, 3);
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if (!ret) {
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*val = be32_to_cpu(*val);
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/* convert to 24bit */
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*val >>= 8;
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}
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return ret;
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}
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static int ksz_spi_write24(struct ksz_device *dev, u32 reg, u32 value)
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{
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/* make it to big endian 24bit from MSB */
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value <<= 8;
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value = cpu_to_be32(value);
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return ksz_spi_write(dev, reg, &value, 3);
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}
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static const struct ksz_io_ops ksz9477_spi_ops = {
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.read8 = ksz_spi_read8,
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.read16 = ksz_spi_read16,
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.read24 = ksz_spi_read24,
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.read32 = ksz_spi_read32,
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.write8 = ksz_spi_write8,
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.write16 = ksz_spi_write16,
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.write24 = ksz_spi_write24,
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.write32 = ksz_spi_write32,
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.get = ksz_spi_get,
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.set = ksz_spi_set,
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};
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static int ksz9477_spi_probe(struct spi_device *spi)
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{
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struct ksz_device *dev;
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int ret;
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dev = ksz_switch_alloc(&spi->dev, &ksz9477_spi_ops, spi);
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if (!dev)
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return -ENOMEM;
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if (spi->dev.platform_data)
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dev->pdata = spi->dev.platform_data;
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dev->txbuf = devm_kzalloc(dev->dev, 4 + SPI_TX_BUF_LEN, GFP_KERNEL);
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ret = ksz9477_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 ksz9477_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 ksz9477_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 ksz9477_dt_ids[] = {
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{ .compatible = "microchip,ksz9477" },
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{ .compatible = "microchip,ksz9897" },
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{},
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};
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MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
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static struct spi_driver ksz9477_spi_driver = {
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.driver = {
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.name = "ksz9477-switch",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(ksz9477_dt_ids),
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},
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.probe = ksz9477_spi_probe,
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.remove = ksz9477_spi_remove,
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.shutdown = ksz9477_spi_shutdown,
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};
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module_spi_driver(ksz9477_spi_driver);
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MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>");
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MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch SPI access Driver");
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MODULE_LICENSE("GPL");
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