diff options
Diffstat (limited to 'drivers/net/dsa/microchip/ksz9477_spi.c')
| -rw-r--r-- | drivers/net/dsa/microchip/ksz9477_spi.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/drivers/net/dsa/microchip/ksz9477_spi.c b/drivers/net/dsa/microchip/ksz9477_spi.c deleted file mode 100644 index d757ba151cb1..000000000000 --- a/drivers/net/dsa/microchip/ksz9477_spi.c +++ /dev/null @@ -1,177 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Microchip KSZ9477 series register access through SPI - * - * Copyright (C) 2017-2018 Microchip Technology Inc. - */ - -#include <asm/unaligned.h> - -#include <linux/delay.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/spi/spi.h> - -#include "ksz_priv.h" -#include "ksz_spi.h" - -/* SPI frame opcodes */ -#define KS_SPIOP_RD 3 -#define KS_SPIOP_WR 2 - -#define SPI_ADDR_SHIFT 24 -#define SPI_ADDR_MASK (BIT(SPI_ADDR_SHIFT) - 1) -#define SPI_TURNAROUND_SHIFT 5 - -/* Enough to read all switch port registers. */ -#define SPI_TX_BUF_LEN 0x100 - -static int ksz9477_spi_read_reg(struct spi_device *spi, u32 reg, u8 *val, - unsigned int len) -{ - u32 txbuf; - int ret; - - txbuf = reg & SPI_ADDR_MASK; - txbuf |= KS_SPIOP_RD << SPI_ADDR_SHIFT; - txbuf <<= SPI_TURNAROUND_SHIFT; - txbuf = cpu_to_be32(txbuf); - - ret = spi_write_then_read(spi, &txbuf, 4, val, len); - return ret; -} - -static int ksz9477_spi_write_reg(struct spi_device *spi, u32 reg, u8 *val, - unsigned int len) -{ - u32 *txbuf = (u32 *)val; - - *txbuf = reg & SPI_ADDR_MASK; - *txbuf |= (KS_SPIOP_WR << SPI_ADDR_SHIFT); - *txbuf <<= SPI_TURNAROUND_SHIFT; - *txbuf = cpu_to_be32(*txbuf); - - return spi_write(spi, txbuf, 4 + len); -} - -static int ksz_spi_read(struct ksz_device *dev, u32 reg, u8 *data, - unsigned int len) -{ - struct spi_device *spi = dev->priv; - - return ksz9477_spi_read_reg(spi, reg, data, len); -} - -static int ksz_spi_write(struct ksz_device *dev, u32 reg, void *data, - unsigned int len) -{ - struct spi_device *spi = dev->priv; - - if (len > SPI_TX_BUF_LEN) - len = SPI_TX_BUF_LEN; - memcpy(&dev->txbuf[4], data, len); - return ksz9477_spi_write_reg(spi, reg, dev->txbuf, len); -} - -static int ksz_spi_read24(struct ksz_device *dev, u32 reg, u32 *val) -{ - int ret; - - *val = 0; - ret = ksz_spi_read(dev, reg, (u8 *)val, 3); - if (!ret) { - *val = be32_to_cpu(*val); - /* convert to 24bit */ - *val >>= 8; - } - - return ret; -} - -static int ksz_spi_write24(struct ksz_device *dev, u32 reg, u32 value) -{ - /* make it to big endian 24bit from MSB */ - value <<= 8; - value = cpu_to_be32(value); - return ksz_spi_write(dev, reg, &value, 3); -} - -static const struct ksz_io_ops ksz9477_spi_ops = { - .read8 = ksz_spi_read8, - .read16 = ksz_spi_read16, - .read24 = ksz_spi_read24, - .read32 = ksz_spi_read32, - .write8 = ksz_spi_write8, - .write16 = ksz_spi_write16, - .write24 = ksz_spi_write24, - .write32 = ksz_spi_write32, - .get = ksz_spi_get, - .set = ksz_spi_set, -}; - -static int ksz9477_spi_probe(struct spi_device *spi) -{ - struct ksz_device *dev; - int ret; - - dev = ksz_switch_alloc(&spi->dev, &ksz9477_spi_ops, spi); - if (!dev) - return -ENOMEM; - - if (spi->dev.platform_data) - dev->pdata = spi->dev.platform_data; - - dev->txbuf = devm_kzalloc(dev->dev, 4 + SPI_TX_BUF_LEN, GFP_KERNEL); - - ret = ksz9477_switch_register(dev); - - /* Main DSA driver may not be started yet. */ - if (ret) - return ret; - - spi_set_drvdata(spi, dev); - - return 0; -} - -static int ksz9477_spi_remove(struct spi_device *spi) -{ - struct ksz_device *dev = spi_get_drvdata(spi); - - if (dev) - ksz_switch_remove(dev); - - return 0; -} - -static void ksz9477_spi_shutdown(struct spi_device *spi) -{ - struct ksz_device *dev = spi_get_drvdata(spi); - - if (dev && dev->dev_ops->shutdown) - dev->dev_ops->shutdown(dev); -} - -static const struct of_device_id ksz9477_dt_ids[] = { - { .compatible = "microchip,ksz9477" }, - { .compatible = "microchip,ksz9897" }, - {}, -}; -MODULE_DEVICE_TABLE(of, ksz9477_dt_ids); - -static struct spi_driver ksz9477_spi_driver = { - .driver = { - .name = "ksz9477-switch", - .owner = THIS_MODULE, - .of_match_table = of_match_ptr(ksz9477_dt_ids), - }, - .probe = ksz9477_spi_probe, - .remove = ksz9477_spi_remove, - .shutdown = ksz9477_spi_shutdown, -}; - -module_spi_driver(ksz9477_spi_driver); - -MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>"); -MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch SPI access Driver"); -MODULE_LICENSE("GPL"); |