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- /*
- * B53 register access through memory mapped registers
- *
- * Copyright (C) 2012-2013 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 <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/io.h>
- #include <linux/platform_device.h>
- #include <linux/platform_data/b53.h>
- #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)
- {
- struct b53_mmap_priv *priv = dev->priv;
- void __iomem *regs = priv->regs;
- *val = readb(regs + (page << 8) + reg);
- return 0;
- }
- static int b53_mmap_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val)
- {
- struct b53_mmap_priv *priv = dev->priv;
- void __iomem *regs = priv->regs;
- if (WARN_ON(reg % 2))
- return -EINVAL;
- if (dev->pdata && dev->pdata->big_endian)
- *val = ioread16be(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)
- {
- struct b53_mmap_priv *priv = dev->priv;
- void __iomem *regs = priv->regs;
- if (WARN_ON(reg % 4))
- return -EINVAL;
- if (dev->pdata && dev->pdata->big_endian)
- *val = ioread32be(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)
- {
- struct b53_mmap_priv *priv = dev->priv;
- void __iomem *regs = priv->regs;
- if (WARN_ON(reg % 2))
- return -EINVAL;
- if (reg % 4) {
- u16 lo;
- u32 hi;
- if (dev->pdata && dev->pdata->big_endian) {
- lo = ioread16be(regs + (page << 8) + reg);
- hi = ioread32be(regs + (page << 8) + reg + 2);
- } else {
- lo = readw(regs + (page << 8) + reg);
- hi = readl(regs + (page << 8) + reg + 2);
- }
- *val = ((u64)hi << 16) | lo;
- } else {
- u32 lo;
- u16 hi;
- if (dev->pdata && dev->pdata->big_endian) {
- lo = ioread32be(regs + (page << 8) + reg);
- hi = ioread16be(regs + (page << 8) + reg + 4);
- } else {
- lo = readl(regs + (page << 8) + reg);
- hi = readw(regs + (page << 8) + reg + 4);
- }
- *val = ((u64)hi << 32) | lo;
- }
- return 0;
- }
- static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val)
- {
- struct b53_mmap_priv *priv = dev->priv;
- void __iomem *regs = priv->regs;
- u32 hi, lo;
- if (WARN_ON(reg % 4))
- return -EINVAL;
- if (dev->pdata && dev->pdata->big_endian) {
- lo = ioread32be(regs + (page << 8) + reg);
- hi = ioread32be(regs + (page << 8) + reg + 4);
- } else {
- lo = readl(regs + (page << 8) + reg);
- hi = readl(regs + (page << 8) + reg + 4);
- }
- *val = ((u64)hi << 32) | lo;
- return 0;
- }
- static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value)
- {
- struct b53_mmap_priv *priv = dev->priv;
- void __iomem *regs = priv->regs;
- writeb(value, regs + (page << 8) + reg);
- return 0;
- }
- static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg,
- u16 value)
- {
- struct b53_mmap_priv *priv = dev->priv;
- void __iomem *regs = priv->regs;
- if (WARN_ON(reg % 2))
- return -EINVAL;
- if (dev->pdata && dev->pdata->big_endian)
- iowrite16be(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)
- {
- struct b53_mmap_priv *priv = dev->priv;
- void __iomem *regs = priv->regs;
- if (WARN_ON(reg % 4))
- return -EINVAL;
- if (dev->pdata && dev->pdata->big_endian)
- iowrite32be(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 const 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_mmap_priv *priv;
- struct b53_device *dev;
- if (!pdata)
- return -EINVAL;
- priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
- priv->regs = pdata->regs;
- dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, priv);
- if (!dev)
- return -ENOMEM;
- 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 */ },
- };
- MODULE_DEVICE_TABLE(of, b53_mmap_of_table);
- 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 <jogo@openwrt.org>");
- MODULE_DESCRIPTION("B53 MMAP access driver");
- MODULE_LICENSE("Dual BSD/GPL");
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