The SRAB interface is used on BCM4707 and BCM5301X SoCs. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> SVN-Revision: 38198master
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/*
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* B53 register access through Switch Register Access Bridge Registers |
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* |
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* Copyright (C) 2013 Hauke Mehrtens <hauke@hauke-m.de> |
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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/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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/* command and status register of the SRAB */ |
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#define B53_SRAB_CMDSTAT 0x2c |
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#define B53_SRAB_CMDSTAT_RST BIT(2) |
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#define B53_SRAB_CMDSTAT_WRITE BIT(1) |
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#define B53_SRAB_CMDSTAT_GORDYN BIT(0) |
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#define B53_SRAB_CMDSTAT_PAGE 24 |
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#define B53_SRAB_CMDSTAT_REG 16 |
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/* high order word of write data to switch registe */ |
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#define B53_SRAB_WD_H 0x30 |
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/* low order word of write data to switch registe */ |
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#define B53_SRAB_WD_L 0x34 |
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/* high order word of read data from switch register */ |
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#define B53_SRAB_RD_H 0x38 |
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/* low order word of read data from switch register */ |
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#define B53_SRAB_RD_L 0x3c |
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/* command and status register of the SRAB */ |
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#define B53_SRAB_CTRLS 0x40 |
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#define B53_SRAB_CTRLS_RCAREQ BIT(3) |
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#define B53_SRAB_CTRLS_RCAGNT BIT(4) |
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#define B53_SRAB_CTRLS_SW_INIT_DONE BIT(6) |
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/* the register captures interrupt pulses from the switch */ |
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#define B53_SRAB_INTR 0x44 |
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static int b53_srab_request_grant(struct b53_device *dev) |
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{ |
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u8 __iomem *regs = dev->priv; |
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u32 ctrls; |
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int i; |
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ctrls = readl(regs + B53_SRAB_CTRLS); |
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ctrls |= B53_SRAB_CTRLS_RCAREQ; |
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writel(ctrls, regs + B53_SRAB_CTRLS); |
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for (i = 0; i < 20; i++) { |
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ctrls = readl(regs + B53_SRAB_CTRLS); |
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if (ctrls & B53_SRAB_CTRLS_RCAGNT) |
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break; |
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usleep_range(10, 100); |
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} |
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if (WARN_ON(i == 5)) |
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return -EIO; |
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return 0; |
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} |
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static void b53_srab_release_grant(struct b53_device *dev) |
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{ |
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u8 __iomem *regs = dev->priv; |
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u32 ctrls; |
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ctrls = readl(regs + B53_SRAB_CTRLS); |
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ctrls &= ~B53_SRAB_CTRLS_RCAREQ; |
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writel(ctrls, regs + B53_SRAB_CTRLS); |
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} |
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static int b53_srab_op(struct b53_device *dev, u8 page, u8 reg, u32 op) |
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{ |
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int i; |
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u32 cmdstat; |
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u8 __iomem *regs = dev->priv; |
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/* set register address */ |
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cmdstat = (page << B53_SRAB_CMDSTAT_PAGE) | |
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(reg << B53_SRAB_CMDSTAT_REG) | |
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B53_SRAB_CMDSTAT_GORDYN | |
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op; |
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writel(cmdstat, regs + B53_SRAB_CMDSTAT); |
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/* check if operation completed */ |
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for (i = 0; i < 5; ++i) { |
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cmdstat = readl(regs + B53_SRAB_CMDSTAT); |
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if (!(cmdstat & B53_SRAB_CMDSTAT_GORDYN)) |
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break; |
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usleep_range(10, 100); |
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} |
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if (WARN_ON(i == 5)) |
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return -EIO; |
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return 0; |
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} |
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static int b53_srab_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val) |
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{ |
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u8 __iomem *regs = dev->priv; |
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int ret = 0; |
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ret = b53_srab_request_grant(dev); |
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if (ret) |
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goto err; |
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ret = b53_srab_op(dev, page, reg, 0); |
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if (ret) |
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goto err; |
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*val = readl(regs + B53_SRAB_RD_L) & 0xff; |
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err: |
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b53_srab_release_grant(dev); |
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return ret; |
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} |
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static int b53_srab_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val) |
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{ |
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u8 __iomem *regs = dev->priv; |
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int ret = 0; |
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ret = b53_srab_request_grant(dev); |
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if (ret) |
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goto err; |
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ret = b53_srab_op(dev, page, reg, 0); |
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if (ret) |
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goto err; |
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*val = readl(regs + B53_SRAB_RD_L) & 0xffff; |
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err: |
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b53_srab_release_grant(dev); |
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return ret; |
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} |
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static int b53_srab_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val) |
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{ |
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u8 __iomem *regs = dev->priv; |
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int ret = 0; |
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ret = b53_srab_request_grant(dev); |
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if (ret) |
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goto err; |
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ret = b53_srab_op(dev, page, reg, 0); |
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if (ret) |
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goto err; |
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*val = readl(regs + B53_SRAB_RD_L); |
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err: |
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b53_srab_release_grant(dev); |
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return ret; |
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} |
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static int b53_srab_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val) |
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{ |
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u8 __iomem *regs = dev->priv; |
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int ret = 0; |
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ret = b53_srab_request_grant(dev); |
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if (ret) |
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goto err; |
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ret = b53_srab_op(dev, page, reg, 0); |
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if (ret) |
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goto err; |
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*val = readl(regs + B53_SRAB_RD_L); |
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*val += ((u64)readl(regs + B53_SRAB_RD_H) & 0xffff) << 32; |
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err: |
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b53_srab_release_grant(dev); |
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return ret; |
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} |
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static int b53_srab_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val) |
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{ |
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u8 __iomem *regs = dev->priv; |
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int ret = 0; |
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ret = b53_srab_request_grant(dev); |
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if (ret) |
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goto err; |
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ret = b53_srab_op(dev, page, reg, 0); |
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if (ret) |
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goto err; |
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*val = readl(regs + B53_SRAB_RD_L); |
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*val += (u64)readl(regs + B53_SRAB_RD_H) << 32; |
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err: |
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b53_srab_release_grant(dev); |
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return ret; |
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} |
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static int b53_srab_write8(struct b53_device *dev, u8 page, u8 reg, u8 value) |
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{ |
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u8 __iomem *regs = dev->priv; |
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int ret = 0; |
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ret = b53_srab_request_grant(dev); |
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if (ret) |
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goto err; |
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writel(value, regs + B53_SRAB_WD_L); |
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ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE); |
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err: |
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b53_srab_release_grant(dev); |
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return ret; |
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} |
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static int b53_srab_write16(struct b53_device *dev, u8 page, u8 reg, |
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u16 value) |
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{ |
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u8 __iomem *regs = dev->priv; |
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int ret = 0; |
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ret = b53_srab_request_grant(dev); |
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if (ret) |
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goto err; |
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writel(value, regs + B53_SRAB_WD_L); |
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ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE); |
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err: |
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b53_srab_release_grant(dev); |
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return ret; |
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} |
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static int b53_srab_write32(struct b53_device *dev, u8 page, u8 reg, |
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u32 value) |
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{ |
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u8 __iomem *regs = dev->priv; |
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int ret = 0; |
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ret = b53_srab_request_grant(dev); |
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if (ret) |
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goto err; |
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writel(value, regs + B53_SRAB_WD_L); |
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ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE); |
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err: |
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b53_srab_release_grant(dev); |
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return ret; |
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} |
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static int b53_srab_write48(struct b53_device *dev, u8 page, u8 reg, |
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u64 value) |
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{ |
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u8 __iomem *regs = dev->priv; |
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int ret = 0; |
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ret = b53_srab_request_grant(dev); |
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if (ret) |
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goto err; |
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writel((u32)value, regs + B53_SRAB_WD_L); |
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writel((u16)(value >> 32), regs + B53_SRAB_WD_H); |
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ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE); |
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err: |
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b53_srab_release_grant(dev); |
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return ret; |
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} |
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static int b53_srab_write64(struct b53_device *dev, u8 page, u8 reg, |
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u64 value) |
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{ |
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u8 __iomem *regs = dev->priv; |
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int ret = 0; |
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ret = b53_srab_request_grant(dev); |
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if (ret) |
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goto err; |
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writel((u32)value, regs + B53_SRAB_WD_L); |
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writel((u32)(value >> 32), regs + B53_SRAB_WD_H); |
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ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE); |
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err: |
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b53_srab_release_grant(dev); |
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return ret; |
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} |
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static struct b53_io_ops b53_srab_ops = { |
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.read8 = b53_srab_read8, |
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.read16 = b53_srab_read16, |
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.read32 = b53_srab_read32, |
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.read48 = b53_srab_read48, |
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.read64 = b53_srab_read64, |
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.write8 = b53_srab_write8, |
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.write16 = b53_srab_write16, |
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.write32 = b53_srab_write32, |
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.write48 = b53_srab_write48, |
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.write64 = b53_srab_write64, |
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}; |
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static int b53_srab_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_device *dev; |
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if (!pdata) |
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return -EINVAL; |
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dev = b53_switch_alloc(&pdev->dev, &b53_srab_ops, pdata->regs); |
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if (!dev) |
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return -ENOMEM; |
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if (pdata) |
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dev->pdata = pdata; |
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pdev->dev.platform_data = dev; |
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return b53_switch_register(dev); |
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} |
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static int b53_srab_remove(struct platform_device *pdev) |
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{ |
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struct b53_device *dev = pdev->dev.platform_data; |
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if (dev) { |
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pdev->dev.platform_data = dev->pdata; |
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b53_switch_remove(dev); |
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} |
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return 0; |
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} |
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static struct platform_driver b53_srab_driver = { |
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.probe = b53_srab_probe, |
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.remove = b53_srab_remove, |
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.driver = { |
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.name = "b53-srab-switch", |
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}, |
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}; |
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module_platform_driver(b53_srab_driver); |
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MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>"); |
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MODULE_DESCRIPTION("B53 Switch Register Access Bridge Registers (SRAB) access driver"); |
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MODULE_LICENSE("Dual BSD/GPL"); |
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