net: dsa: b53: Add support for Broadcom RoboSwitch
This patch adds support for Broadcom's BCM53xx switch family, also known as RoboSwitch. Some of these switches are ubiquituous, found in home routers, Wi-Fi routers, DSL and cable modem gateways and other networking related products. This drivers adds the library driver (b53_common.c) as well as a few bus glue drivers for MDIO, SPI, Switch Register Access Block (SRAB) and memory-mapped I/O into a SoC's address space (Broadcom BCM63xx/33xx). Basic operations are supported to bring the Layer 1/2 up and running, but not much more at this point, subsequent patches add the remaining features. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli
committed by
David S. Miller
David S. Miller
parent
409a5f27ed
commit
967dd82ffc
331
drivers/net/dsa/b53/b53_spi.c
Normal file
331
drivers/net/dsa/b53/b53_spi.c
Normal file
@@ -0,0 +1,331 @@
|
||||
/*
|
||||
* B53 register access through SPI
|
||||
*
|
||||
* Copyright (C) 2011-2013 Jonas Gorski <jogo@openwrt.org>
|
||||
*
|
||||
* Permission to use, copy, modify, and/or distribute this software for any
|
||||
* purpose with or without fee is hereby granted, provided that the above
|
||||
* copyright notice and this permission notice appear in all copies.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||||
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||||
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
||||
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||||
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||||
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
||||
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||||
*/
|
||||
|
||||
#include <asm/unaligned.h>
|
||||
|
||||
#include <linux/delay.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/platform_data/b53.h>
|
||||
|
||||
#include "b53_priv.h"
|
||||
|
||||
#define B53_SPI_DATA 0xf0
|
||||
|
||||
#define B53_SPI_STATUS 0xfe
|
||||
#define B53_SPI_CMD_SPIF BIT(7)
|
||||
#define B53_SPI_CMD_RACK BIT(5)
|
||||
|
||||
#define B53_SPI_CMD_READ 0x00
|
||||
#define B53_SPI_CMD_WRITE 0x01
|
||||
#define B53_SPI_CMD_NORMAL 0x60
|
||||
#define B53_SPI_CMD_FAST 0x10
|
||||
|
||||
#define B53_SPI_PAGE_SELECT 0xff
|
||||
|
||||
static inline int b53_spi_read_reg(struct spi_device *spi, u8 reg, u8 *val,
|
||||
unsigned int len)
|
||||
{
|
||||
u8 txbuf[2];
|
||||
|
||||
txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_READ;
|
||||
txbuf[1] = reg;
|
||||
|
||||
return spi_write_then_read(spi, txbuf, 2, val, len);
|
||||
}
|
||||
|
||||
static inline int b53_spi_clear_status(struct spi_device *spi)
|
||||
{
|
||||
unsigned int i;
|
||||
u8 rxbuf;
|
||||
int ret;
|
||||
|
||||
for (i = 0; i < 10; i++) {
|
||||
ret = b53_spi_read_reg(spi, B53_SPI_STATUS, &rxbuf, 1);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (!(rxbuf & B53_SPI_CMD_SPIF))
|
||||
break;
|
||||
|
||||
mdelay(1);
|
||||
}
|
||||
|
||||
if (i == 10)
|
||||
return -EIO;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int b53_spi_set_page(struct spi_device *spi, u8 page)
|
||||
{
|
||||
u8 txbuf[3];
|
||||
|
||||
txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
|
||||
txbuf[1] = B53_SPI_PAGE_SELECT;
|
||||
txbuf[2] = page;
|
||||
|
||||
return spi_write(spi, txbuf, sizeof(txbuf));
|
||||
}
|
||||
|
||||
static inline int b53_prepare_reg_access(struct spi_device *spi, u8 page)
|
||||
{
|
||||
int ret = b53_spi_clear_status(spi);
|
||||
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return b53_spi_set_page(spi, page);
|
||||
}
|
||||
|
||||
static int b53_spi_prepare_reg_read(struct spi_device *spi, u8 reg)
|
||||
{
|
||||
u8 rxbuf;
|
||||
int retry_count;
|
||||
int ret;
|
||||
|
||||
ret = b53_spi_read_reg(spi, reg, &rxbuf, 1);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
for (retry_count = 0; retry_count < 10; retry_count++) {
|
||||
ret = b53_spi_read_reg(spi, B53_SPI_STATUS, &rxbuf, 1);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (rxbuf & B53_SPI_CMD_RACK)
|
||||
break;
|
||||
|
||||
mdelay(1);
|
||||
}
|
||||
|
||||
if (retry_count == 10)
|
||||
return -EIO;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int b53_spi_read(struct b53_device *dev, u8 page, u8 reg, u8 *data,
|
||||
unsigned int len)
|
||||
{
|
||||
struct spi_device *spi = dev->priv;
|
||||
int ret;
|
||||
|
||||
ret = b53_prepare_reg_access(spi, page);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = b53_spi_prepare_reg_read(spi, reg);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return b53_spi_read_reg(spi, B53_SPI_DATA, data, len);
|
||||
}
|
||||
|
||||
static int b53_spi_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val)
|
||||
{
|
||||
return b53_spi_read(dev, page, reg, val, 1);
|
||||
}
|
||||
|
||||
static int b53_spi_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val)
|
||||
{
|
||||
int ret = b53_spi_read(dev, page, reg, (u8 *)val, 2);
|
||||
|
||||
if (!ret)
|
||||
*val = le16_to_cpu(*val);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int b53_spi_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val)
|
||||
{
|
||||
int ret = b53_spi_read(dev, page, reg, (u8 *)val, 4);
|
||||
|
||||
if (!ret)
|
||||
*val = le32_to_cpu(*val);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int b53_spi_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val)
|
||||
{
|
||||
int ret;
|
||||
|
||||
*val = 0;
|
||||
ret = b53_spi_read(dev, page, reg, (u8 *)val, 6);
|
||||
if (!ret)
|
||||
*val = le64_to_cpu(*val);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int b53_spi_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val)
|
||||
{
|
||||
int ret = b53_spi_read(dev, page, reg, (u8 *)val, 8);
|
||||
|
||||
if (!ret)
|
||||
*val = le64_to_cpu(*val);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int b53_spi_write8(struct b53_device *dev, u8 page, u8 reg, u8 value)
|
||||
{
|
||||
struct spi_device *spi = dev->priv;
|
||||
int ret;
|
||||
u8 txbuf[3];
|
||||
|
||||
ret = b53_prepare_reg_access(spi, page);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
|
||||
txbuf[1] = reg;
|
||||
txbuf[2] = value;
|
||||
|
||||
return spi_write(spi, txbuf, sizeof(txbuf));
|
||||
}
|
||||
|
||||
static int b53_spi_write16(struct b53_device *dev, u8 page, u8 reg, u16 value)
|
||||
{
|
||||
struct spi_device *spi = dev->priv;
|
||||
int ret;
|
||||
u8 txbuf[4];
|
||||
|
||||
ret = b53_prepare_reg_access(spi, page);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
|
||||
txbuf[1] = reg;
|
||||
put_unaligned_le16(value, &txbuf[2]);
|
||||
|
||||
return spi_write(spi, txbuf, sizeof(txbuf));
|
||||
}
|
||||
|
||||
static int b53_spi_write32(struct b53_device *dev, u8 page, u8 reg, u32 value)
|
||||
{
|
||||
struct spi_device *spi = dev->priv;
|
||||
int ret;
|
||||
u8 txbuf[6];
|
||||
|
||||
ret = b53_prepare_reg_access(spi, page);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
|
||||
txbuf[1] = reg;
|
||||
put_unaligned_le32(value, &txbuf[2]);
|
||||
|
||||
return spi_write(spi, txbuf, sizeof(txbuf));
|
||||
}
|
||||
|
||||
static int b53_spi_write48(struct b53_device *dev, u8 page, u8 reg, u64 value)
|
||||
{
|
||||
struct spi_device *spi = dev->priv;
|
||||
int ret;
|
||||
u8 txbuf[10];
|
||||
|
||||
ret = b53_prepare_reg_access(spi, page);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
|
||||
txbuf[1] = reg;
|
||||
put_unaligned_le64(value, &txbuf[2]);
|
||||
|
||||
return spi_write(spi, txbuf, sizeof(txbuf) - 2);
|
||||
}
|
||||
|
||||
static int b53_spi_write64(struct b53_device *dev, u8 page, u8 reg, u64 value)
|
||||
{
|
||||
struct spi_device *spi = dev->priv;
|
||||
int ret;
|
||||
u8 txbuf[10];
|
||||
|
||||
ret = b53_prepare_reg_access(spi, page);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
|
||||
txbuf[1] = reg;
|
||||
put_unaligned_le64(value, &txbuf[2]);
|
||||
|
||||
return spi_write(spi, txbuf, sizeof(txbuf));
|
||||
}
|
||||
|
||||
static struct b53_io_ops b53_spi_ops = {
|
||||
.read8 = b53_spi_read8,
|
||||
.read16 = b53_spi_read16,
|
||||
.read32 = b53_spi_read32,
|
||||
.read48 = b53_spi_read48,
|
||||
.read64 = b53_spi_read64,
|
||||
.write8 = b53_spi_write8,
|
||||
.write16 = b53_spi_write16,
|
||||
.write32 = b53_spi_write32,
|
||||
.write48 = b53_spi_write48,
|
||||
.write64 = b53_spi_write64,
|
||||
};
|
||||
|
||||
static int b53_spi_probe(struct spi_device *spi)
|
||||
{
|
||||
struct b53_device *dev;
|
||||
int ret;
|
||||
|
||||
dev = b53_switch_alloc(&spi->dev, &b53_spi_ops, spi);
|
||||
if (!dev)
|
||||
return -ENOMEM;
|
||||
|
||||
if (spi->dev.platform_data)
|
||||
dev->pdata = spi->dev.platform_data;
|
||||
|
||||
ret = b53_switch_register(dev);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
spi_set_drvdata(spi, dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int b53_spi_remove(struct spi_device *spi)
|
||||
{
|
||||
struct b53_device *dev = spi_get_drvdata(spi);
|
||||
|
||||
if (dev)
|
||||
b53_switch_remove(dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct spi_driver b53_spi_driver = {
|
||||
.driver = {
|
||||
.name = "b53-switch",
|
||||
.bus = &spi_bus_type,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = b53_spi_probe,
|
||||
.remove = b53_spi_remove,
|
||||
};
|
||||
|
||||
module_spi_driver(b53_spi_driver);
|
||||
|
||||
MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
|
||||
MODULE_DESCRIPTION("B53 SPI access driver");
|
||||
MODULE_LICENSE("Dual BSD/GPL");
|
||||
Reference in New Issue
Block a user