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288 lines
6.5 KiB
288 lines
6.5 KiB
/* |
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* B53 register access through memory mapped registers |
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* |
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* Copyright (C) 2012-2013 Jonas Gorski <[email protected]> |
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* |
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* Permission to use, copy, modify, and/or distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/io.h> |
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#include <linux/platform_device.h> |
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#include <linux/platform_data/b53.h> |
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#include "b53_priv.h" |
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struct b53_mmap_priv { |
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void __iomem *regs; |
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}; |
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static int b53_mmap_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val) |
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{ |
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struct b53_mmap_priv *priv = dev->priv; |
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void __iomem *regs = priv->regs; |
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*val = readb(regs + (page << 8) + reg); |
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return 0; |
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} |
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static int b53_mmap_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val) |
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{ |
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struct b53_mmap_priv *priv = dev->priv; |
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void __iomem *regs = priv->regs; |
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if (WARN_ON(reg % 2)) |
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return -EINVAL; |
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if (dev->pdata && dev->pdata->big_endian) |
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*val = ioread16be(regs + (page << 8) + reg); |
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else |
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*val = readw(regs + (page << 8) + reg); |
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return 0; |
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} |
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static int b53_mmap_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val) |
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{ |
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struct b53_mmap_priv *priv = dev->priv; |
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void __iomem *regs = priv->regs; |
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if (WARN_ON(reg % 4)) |
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return -EINVAL; |
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if (dev->pdata && dev->pdata->big_endian) |
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*val = ioread32be(regs + (page << 8) + reg); |
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else |
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*val = readl(regs + (page << 8) + reg); |
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return 0; |
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} |
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static int b53_mmap_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val) |
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{ |
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struct b53_mmap_priv *priv = dev->priv; |
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void __iomem *regs = priv->regs; |
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if (WARN_ON(reg % 2)) |
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return -EINVAL; |
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if (reg % 4) { |
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u16 lo; |
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u32 hi; |
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if (dev->pdata && dev->pdata->big_endian) { |
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lo = ioread16be(regs + (page << 8) + reg); |
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hi = ioread32be(regs + (page << 8) + reg + 2); |
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} else { |
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lo = readw(regs + (page << 8) + reg); |
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hi = readl(regs + (page << 8) + reg + 2); |
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} |
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*val = ((u64)hi << 16) | lo; |
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} else { |
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u32 lo; |
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u16 hi; |
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if (dev->pdata && dev->pdata->big_endian) { |
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lo = ioread32be(regs + (page << 8) + reg); |
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hi = ioread16be(regs + (page << 8) + reg + 4); |
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} else { |
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lo = readl(regs + (page << 8) + reg); |
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hi = readw(regs + (page << 8) + reg + 4); |
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} |
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*val = ((u64)hi << 32) | lo; |
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} |
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return 0; |
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} |
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static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val) |
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{ |
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struct b53_mmap_priv *priv = dev->priv; |
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void __iomem *regs = priv->regs; |
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u32 hi, lo; |
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if (WARN_ON(reg % 4)) |
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return -EINVAL; |
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if (dev->pdata && dev->pdata->big_endian) { |
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lo = ioread32be(regs + (page << 8) + reg); |
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hi = ioread32be(regs + (page << 8) + reg + 4); |
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} else { |
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lo = readl(regs + (page << 8) + reg); |
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hi = readl(regs + (page << 8) + reg + 4); |
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} |
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*val = ((u64)hi << 32) | lo; |
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return 0; |
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} |
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static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value) |
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{ |
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struct b53_mmap_priv *priv = dev->priv; |
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void __iomem *regs = priv->regs; |
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writeb(value, regs + (page << 8) + reg); |
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return 0; |
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} |
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static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg, |
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u16 value) |
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{ |
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struct b53_mmap_priv *priv = dev->priv; |
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void __iomem *regs = priv->regs; |
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if (WARN_ON(reg % 2)) |
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return -EINVAL; |
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if (dev->pdata && dev->pdata->big_endian) |
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iowrite16be(value, regs + (page << 8) + reg); |
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else |
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writew(value, regs + (page << 8) + reg); |
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return 0; |
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} |
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static int b53_mmap_write32(struct b53_device *dev, u8 page, u8 reg, |
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u32 value) |
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{ |
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struct b53_mmap_priv *priv = dev->priv; |
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void __iomem *regs = priv->regs; |
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if (WARN_ON(reg % 4)) |
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return -EINVAL; |
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if (dev->pdata && dev->pdata->big_endian) |
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iowrite32be(value, regs + (page << 8) + reg); |
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else |
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writel(value, regs + (page << 8) + reg); |
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return 0; |
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} |
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static int b53_mmap_write48(struct b53_device *dev, u8 page, u8 reg, |
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u64 value) |
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{ |
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if (WARN_ON(reg % 2)) |
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return -EINVAL; |
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if (reg % 4) { |
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u32 hi = (u32)(value >> 16); |
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u16 lo = (u16)value; |
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b53_mmap_write16(dev, page, reg, lo); |
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b53_mmap_write32(dev, page, reg + 2, hi); |
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} else { |
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u16 hi = (u16)(value >> 32); |
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u32 lo = (u32)value; |
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b53_mmap_write32(dev, page, reg, lo); |
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b53_mmap_write16(dev, page, reg + 4, hi); |
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} |
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return 0; |
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} |
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static int b53_mmap_write64(struct b53_device *dev, u8 page, u8 reg, |
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u64 value) |
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{ |
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u32 hi, lo; |
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hi = upper_32_bits(value); |
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lo = lower_32_bits(value); |
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if (WARN_ON(reg % 4)) |
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return -EINVAL; |
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b53_mmap_write32(dev, page, reg, lo); |
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b53_mmap_write32(dev, page, reg + 4, hi); |
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return 0; |
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} |
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static const struct b53_io_ops b53_mmap_ops = { |
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.read8 = b53_mmap_read8, |
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.read16 = b53_mmap_read16, |
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.read32 = b53_mmap_read32, |
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.read48 = b53_mmap_read48, |
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.read64 = b53_mmap_read64, |
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.write8 = b53_mmap_write8, |
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.write16 = b53_mmap_write16, |
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.write32 = b53_mmap_write32, |
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.write48 = b53_mmap_write48, |
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.write64 = b53_mmap_write64, |
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}; |
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static int b53_mmap_probe(struct platform_device *pdev) |
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{ |
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struct b53_platform_data *pdata = pdev->dev.platform_data; |
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struct b53_mmap_priv *priv; |
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struct b53_device *dev; |
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if (!pdata) |
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return -EINVAL; |
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->regs = pdata->regs; |
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dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, priv); |
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if (!dev) |
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return -ENOMEM; |
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dev->pdata = pdata; |
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platform_set_drvdata(pdev, dev); |
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return b53_switch_register(dev); |
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} |
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static int b53_mmap_remove(struct platform_device *pdev) |
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{ |
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struct b53_device *dev = platform_get_drvdata(pdev); |
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if (dev) |
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b53_switch_remove(dev); |
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return 0; |
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} |
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static const struct of_device_id b53_mmap_of_table[] = { |
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{ .compatible = "brcm,bcm3384-switch" }, |
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{ .compatible = "brcm,bcm6328-switch" }, |
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{ .compatible = "brcm,bcm6368-switch" }, |
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{ .compatible = "brcm,bcm63xx-switch" }, |
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{ /* sentinel */ }, |
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}; |
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MODULE_DEVICE_TABLE(of, b53_mmap_of_table); |
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static struct platform_driver b53_mmap_driver = { |
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.probe = b53_mmap_probe, |
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.remove = b53_mmap_remove, |
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.driver = { |
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.name = "b53-switch", |
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.of_match_table = b53_mmap_of_table, |
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}, |
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}; |
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module_platform_driver(b53_mmap_driver); |
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MODULE_AUTHOR("Jonas Gorski <[email protected]>"); |
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MODULE_DESCRIPTION("B53 MMAP access driver"); |
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MODULE_LICENSE("Dual BSD/GPL");
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