| /* |
| * 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"); |
