diff options
Diffstat (limited to 'drivers/net/ethernet/wiznet/w5100-spi.c')
| -rw-r--r-- | drivers/net/ethernet/wiznet/w5100-spi.c | 174 |
1 files changed, 169 insertions, 5 deletions
diff --git a/drivers/net/ethernet/wiznet/w5100-spi.c b/drivers/net/ethernet/wiznet/w5100-spi.c index 32f406cfce4b..598a7b00fdb9 100644 --- a/drivers/net/ethernet/wiznet/w5100-spi.c +++ b/drivers/net/ethernet/wiznet/w5100-spi.c @@ -1,9 +1,13 @@ /* - * Ethernet driver for the WIZnet W5100 chip. + * Ethernet driver for the WIZnet W5100/W5200 chip. * * Copyright (C) 2016 Akinobu Mita <akinobu.mita@gmail.com> * * Licensed under the GPL-2 or later. + * + * Datasheet: + * http://www.wiznet.co.kr/wp-content/uploads/wiznethome/Chip/W5100/Document/W5100_Datasheet_v1.2.6.pdf + * http://wiznethome.cafe24.com/wp-content/uploads/wiznethome/Chip/W5200/Documents/W5200_DS_V140E.pdf */ #include <linux/kernel.h> @@ -95,6 +99,7 @@ static int w5100_spi_writebulk(struct net_device *ndev, u16 addr, const u8 *buf, static const struct w5100_ops w5100_spi_ops = { .may_sleep = true, + .chip_id = W5100, .read = w5100_spi_read, .write = w5100_spi_write, .read16 = w5100_spi_read16, @@ -103,10 +108,168 @@ static const struct w5100_ops w5100_spi_ops = { .writebulk = w5100_spi_writebulk, }; +#define W5200_SPI_WRITE_OPCODE 0x80 + +struct w5200_spi_priv { + /* Serialize access to cmd_buf */ + struct mutex cmd_lock; + + /* DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + u8 cmd_buf[4] ____cacheline_aligned; +}; + +static struct w5200_spi_priv *w5200_spi_priv(struct net_device *ndev) +{ + return w5100_ops_priv(ndev); +} + +static int w5200_spi_init(struct net_device *ndev) +{ + struct w5200_spi_priv *spi_priv = w5200_spi_priv(ndev); + + mutex_init(&spi_priv->cmd_lock); + + return 0; +} + +static int w5200_spi_read(struct net_device *ndev, u16 addr) +{ + struct spi_device *spi = to_spi_device(ndev->dev.parent); + u8 cmd[4] = { addr >> 8, addr & 0xff, 0, 1 }; + u8 data; + int ret; + + ret = spi_write_then_read(spi, cmd, sizeof(cmd), &data, 1); + + return ret ? ret : data; +} + +static int w5200_spi_write(struct net_device *ndev, u16 addr, u8 data) +{ + struct spi_device *spi = to_spi_device(ndev->dev.parent); + u8 cmd[5] = { addr >> 8, addr & 0xff, W5200_SPI_WRITE_OPCODE, 1, data }; + + return spi_write_then_read(spi, cmd, sizeof(cmd), NULL, 0); +} + +static int w5200_spi_read16(struct net_device *ndev, u16 addr) +{ + struct spi_device *spi = to_spi_device(ndev->dev.parent); + u8 cmd[4] = { addr >> 8, addr & 0xff, 0, 2 }; + __be16 data; + int ret; + + ret = spi_write_then_read(spi, cmd, sizeof(cmd), &data, sizeof(data)); + + return ret ? ret : be16_to_cpu(data); +} + +static int w5200_spi_write16(struct net_device *ndev, u16 addr, u16 data) +{ + struct spi_device *spi = to_spi_device(ndev->dev.parent); + u8 cmd[6] = { + addr >> 8, addr & 0xff, + W5200_SPI_WRITE_OPCODE, 2, + data >> 8, data & 0xff + }; + + return spi_write_then_read(spi, cmd, sizeof(cmd), NULL, 0); +} + +static int w5200_spi_readbulk(struct net_device *ndev, u16 addr, u8 *buf, + int len) +{ + struct spi_device *spi = to_spi_device(ndev->dev.parent); + struct w5200_spi_priv *spi_priv = w5200_spi_priv(ndev); + struct spi_transfer xfer[] = { + { + .tx_buf = spi_priv->cmd_buf, + .len = sizeof(spi_priv->cmd_buf), + }, + { + .rx_buf = buf, + .len = len, + }, + }; + int ret; + + mutex_lock(&spi_priv->cmd_lock); + + spi_priv->cmd_buf[0] = addr >> 8; + spi_priv->cmd_buf[1] = addr; + spi_priv->cmd_buf[2] = len >> 8; + spi_priv->cmd_buf[3] = len; + ret = spi_sync_transfer(spi, xfer, ARRAY_SIZE(xfer)); + + mutex_unlock(&spi_priv->cmd_lock); + + return ret; +} + +static int w5200_spi_writebulk(struct net_device *ndev, u16 addr, const u8 *buf, + int len) +{ + struct spi_device *spi = to_spi_device(ndev->dev.parent); + struct w5200_spi_priv *spi_priv = w5200_spi_priv(ndev); + struct spi_transfer xfer[] = { + { + .tx_buf = spi_priv->cmd_buf, + .len = sizeof(spi_priv->cmd_buf), + }, + { + .tx_buf = buf, + .len = len, + }, + }; + int ret; + + mutex_lock(&spi_priv->cmd_lock); + + spi_priv->cmd_buf[0] = addr >> 8; + spi_priv->cmd_buf[1] = addr; + spi_priv->cmd_buf[2] = W5200_SPI_WRITE_OPCODE | (len >> 8); + spi_priv->cmd_buf[3] = len; + ret = spi_sync_transfer(spi, xfer, ARRAY_SIZE(xfer)); + + mutex_unlock(&spi_priv->cmd_lock); + + return ret; +} + +static const struct w5100_ops w5200_ops = { + .may_sleep = true, + .chip_id = W5200, + .read = w5200_spi_read, + .write = w5200_spi_write, + .read16 = w5200_spi_read16, + .write16 = w5200_spi_write16, + .readbulk = w5200_spi_readbulk, + .writebulk = w5200_spi_writebulk, + .init = w5200_spi_init, +}; + static int w5100_spi_probe(struct spi_device *spi) { - return w5100_probe(&spi->dev, &w5100_spi_ops, 0, NULL, spi->irq, - -EINVAL); + const struct spi_device_id *id = spi_get_device_id(spi); + const struct w5100_ops *ops; + int priv_size; + + switch (id->driver_data) { + case W5100: + ops = &w5100_spi_ops; + priv_size = 0; + break; + case W5200: + ops = &w5200_ops; + priv_size = sizeof(struct w5200_spi_priv); + break; + default: + return -EINVAL; + } + + return w5100_probe(&spi->dev, ops, priv_size, NULL, spi->irq, -EINVAL); } static int w5100_spi_remove(struct spi_device *spi) @@ -115,7 +278,8 @@ static int w5100_spi_remove(struct spi_device *spi) } static const struct spi_device_id w5100_spi_ids[] = { - { "w5100", 0 }, + { "w5100", W5100 }, + { "w5200", W5200 }, {} }; MODULE_DEVICE_TABLE(spi, w5100_spi_ids); @@ -131,6 +295,6 @@ static struct spi_driver w5100_spi_driver = { }; module_spi_driver(w5100_spi_driver); -MODULE_DESCRIPTION("WIZnet W5100 Ethernet driver for SPI mode"); +MODULE_DESCRIPTION("WIZnet W5100/W5200 Ethernet driver for SPI mode"); MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>"); MODULE_LICENSE("GPL"); |