From 967dd82ffc52e9d8ea0defde094f9a39a3f4eeed Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Thu, 9 Jun 2016 18:23:53 -0700 Subject: 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 Signed-off-by: David S. Miller --- drivers/net/dsa/b53/b53_mmap.c | 260 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 260 insertions(+) create mode 100644 drivers/net/dsa/b53/b53_mmap.c (limited to 'drivers/net/dsa/b53/b53_mmap.c') diff --git a/drivers/net/dsa/b53/b53_mmap.c b/drivers/net/dsa/b53/b53_mmap.c new file mode 100644 index 000000000000..f115ee25c0e8 --- /dev/null +++ b/drivers/net/dsa/b53/b53_mmap.c @@ -0,0 +1,260 @@ +/* + * B53 register access through memory mapped registers + * + * Copyright (C) 2012-2013 Jonas Gorski + * + * 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 +#include +#include +#include +#include +#include + +#include "b53_priv.h" + +struct b53_mmap_priv { + void __iomem *regs; +}; + +static int b53_mmap_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val) +{ + u8 __iomem *regs = dev->priv; + + *val = readb(regs + (page << 8) + reg); + + return 0; +} + +static int b53_mmap_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val) +{ + u8 __iomem *regs = dev->priv; + + if (WARN_ON(reg % 2)) + return -EINVAL; + + if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && dev->pdata && + dev->pdata->big_endian) + *val = __raw_readw(regs + (page << 8) + reg); + else + *val = readw(regs + (page << 8) + reg); + + return 0; +} + +static int b53_mmap_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val) +{ + u8 __iomem *regs = dev->priv; + + if (WARN_ON(reg % 4)) + return -EINVAL; + + if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && dev->pdata && + dev->pdata->big_endian) + *val = __raw_readl(regs + (page << 8) + reg); + else + *val = readl(regs + (page << 8) + reg); + + return 0; +} + +static int b53_mmap_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val) +{ + if (WARN_ON(reg % 2)) + return -EINVAL; + + if (reg % 4) { + u16 lo; + u32 hi; + + b53_mmap_read16(dev, page, reg, &lo); + b53_mmap_read32(dev, page, reg + 2, &hi); + + *val = ((u64)hi << 16) | lo; + } else { + u32 lo; + u16 hi; + + b53_mmap_read32(dev, page, reg, &lo); + b53_mmap_read16(dev, page, reg + 4, &hi); + + *val = ((u64)hi << 32) | lo; + } + + return 0; +} + +static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val) +{ + u32 hi, lo; + + if (WARN_ON(reg % 4)) + return -EINVAL; + + b53_mmap_read32(dev, page, reg, &lo); + b53_mmap_read32(dev, page, reg + 4, &hi); + + *val = ((u64)hi << 32) | lo; + + return 0; +} + +static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value) +{ + u8 __iomem *regs = dev->priv; + + writeb(value, regs + (page << 8) + reg); + + return 0; +} + +static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg, + u16 value) +{ + u8 __iomem *regs = dev->priv; + + if (WARN_ON(reg % 2)) + return -EINVAL; + + if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && dev->pdata && + dev->pdata->big_endian) + __raw_writew(value, regs + (page << 8) + reg); + else + writew(value, regs + (page << 8) + reg); + + return 0; +} + +static int b53_mmap_write32(struct b53_device *dev, u8 page, u8 reg, + u32 value) +{ + u8 __iomem *regs = dev->priv; + + if (WARN_ON(reg % 4)) + return -EINVAL; + + if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && dev->pdata && + dev->pdata->big_endian) + __raw_writel(value, regs + (page << 8) + reg); + else + writel(value, regs + (page << 8) + reg); + + return 0; +} + +static int b53_mmap_write48(struct b53_device *dev, u8 page, u8 reg, + u64 value) +{ + if (WARN_ON(reg % 2)) + return -EINVAL; + + if (reg % 4) { + u32 hi = (u32)(value >> 16); + u16 lo = (u16)value; + + b53_mmap_write16(dev, page, reg, lo); + b53_mmap_write32(dev, page, reg + 2, hi); + } else { + u16 hi = (u16)(value >> 32); + u32 lo = (u32)value; + + b53_mmap_write32(dev, page, reg, lo); + b53_mmap_write16(dev, page, reg + 4, hi); + } + + return 0; +} + +static int b53_mmap_write64(struct b53_device *dev, u8 page, u8 reg, + u64 value) +{ + u32 hi, lo; + + hi = upper_32_bits(value); + lo = lower_32_bits(value); + + if (WARN_ON(reg % 4)) + return -EINVAL; + + b53_mmap_write32(dev, page, reg, lo); + b53_mmap_write32(dev, page, reg + 4, hi); + + return 0; +} + +static struct b53_io_ops b53_mmap_ops = { + .read8 = b53_mmap_read8, + .read16 = b53_mmap_read16, + .read32 = b53_mmap_read32, + .read48 = b53_mmap_read48, + .read64 = b53_mmap_read64, + .write8 = b53_mmap_write8, + .write16 = b53_mmap_write16, + .write32 = b53_mmap_write32, + .write48 = b53_mmap_write48, + .write64 = b53_mmap_write64, +}; + +static int b53_mmap_probe(struct platform_device *pdev) +{ + struct b53_platform_data *pdata = pdev->dev.platform_data; + struct b53_device *dev; + + if (!pdata) + return -EINVAL; + + dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, pdata->regs); + if (!dev) + return -ENOMEM; + + if (pdata) + dev->pdata = pdata; + + platform_set_drvdata(pdev, dev); + + return b53_switch_register(dev); +} + +static int b53_mmap_remove(struct platform_device *pdev) +{ + struct b53_device *dev = platform_get_drvdata(pdev); + + if (dev) + b53_switch_remove(dev); + + return 0; +} + +static const struct of_device_id b53_mmap_of_table[] = { + { .compatible = "brcm,bcm3384-switch" }, + { .compatible = "brcm,bcm6328-switch" }, + { .compatible = "brcm,bcm6368-switch" }, + { .compatible = "brcm,bcm63xx-switch" }, + { /* sentinel */ }, +}; + +static struct platform_driver b53_mmap_driver = { + .probe = b53_mmap_probe, + .remove = b53_mmap_remove, + .driver = { + .name = "b53-switch", + .of_match_table = b53_mmap_of_table, + }, +}; + +module_platform_driver(b53_mmap_driver); +MODULE_AUTHOR("Jonas Gorski "); +MODULE_DESCRIPTION("B53 MMAP access driver"); +MODULE_LICENSE("Dual BSD/GPL"); -- cgit v1.2.3-59-g8ed1b