/* * B53 register access through Switch Register Access Bridge Registers * * Copyright (C) 2013 Hauke Mehrtens * * 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 "b53_priv.h" /* command and status register of the SRAB */ #define B53_SRAB_CMDSTAT 0x2c #define B53_SRAB_CMDSTAT_RST BIT(2) #define B53_SRAB_CMDSTAT_WRITE BIT(1) #define B53_SRAB_CMDSTAT_GORDYN BIT(0) #define B53_SRAB_CMDSTAT_PAGE 24 #define B53_SRAB_CMDSTAT_REG 16 /* high order word of write data to switch registe */ #define B53_SRAB_WD_H 0x30 /* low order word of write data to switch registe */ #define B53_SRAB_WD_L 0x34 /* high order word of read data from switch register */ #define B53_SRAB_RD_H 0x38 /* low order word of read data from switch register */ #define B53_SRAB_RD_L 0x3c /* command and status register of the SRAB */ #define B53_SRAB_CTRLS 0x40 #define B53_SRAB_CTRLS_RCAREQ BIT(3) #define B53_SRAB_CTRLS_RCAGNT BIT(4) #define B53_SRAB_CTRLS_SW_INIT_DONE BIT(6) /* the register captures interrupt pulses from the switch */ #define B53_SRAB_INTR 0x44 static int b53_srab_request_grant(struct b53_device *dev) { u8 __iomem *regs = dev->priv; u32 ctrls; int i; ctrls = readl(regs + B53_SRAB_CTRLS); ctrls |= B53_SRAB_CTRLS_RCAREQ; writel(ctrls, regs + B53_SRAB_CTRLS); for (i = 0; i < 20; i++) { ctrls = readl(regs + B53_SRAB_CTRLS); if (ctrls & B53_SRAB_CTRLS_RCAGNT) break; usleep_range(10, 100); } if (WARN_ON(i == 5)) return -EIO; return 0; } static void b53_srab_release_grant(struct b53_device *dev) { u8 __iomem *regs = dev->priv; u32 ctrls; ctrls = readl(regs + B53_SRAB_CTRLS); ctrls &= ~B53_SRAB_CTRLS_RCAREQ; writel(ctrls, regs + B53_SRAB_CTRLS); } static int b53_srab_op(struct b53_device *dev, u8 page, u8 reg, u32 op) { int i; u32 cmdstat; u8 __iomem *regs = dev->priv; /* set register address */ cmdstat = (page << B53_SRAB_CMDSTAT_PAGE) | (reg << B53_SRAB_CMDSTAT_REG) | B53_SRAB_CMDSTAT_GORDYN | op; writel(cmdstat, regs + B53_SRAB_CMDSTAT); /* check if operation completed */ for (i = 0; i < 5; ++i) { cmdstat = readl(regs + B53_SRAB_CMDSTAT); if (!(cmdstat & B53_SRAB_CMDSTAT_GORDYN)) break; usleep_range(10, 100); } if (WARN_ON(i == 5)) return -EIO; return 0; } static int b53_srab_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val) { u8 __iomem *regs = dev->priv; int ret = 0; ret = b53_srab_request_grant(dev); if (ret) goto err; ret = b53_srab_op(dev, page, reg, 0); if (ret) goto err; *val = readl(regs + B53_SRAB_RD_L) & 0xff; err: b53_srab_release_grant(dev); return ret; } static int b53_srab_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val) { u8 __iomem *regs = dev->priv; int ret = 0; ret = b53_srab_request_grant(dev); if (ret) goto err; ret = b53_srab_op(dev, page, reg, 0); if (ret) goto err; *val = readl(regs + B53_SRAB_RD_L) & 0xffff; err: b53_srab_release_grant(dev); return ret; } static int b53_srab_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val) { u8 __iomem *regs = dev->priv; int ret = 0; ret = b53_srab_request_grant(dev); if (ret) goto err; ret = b53_srab_op(dev, page, reg, 0); if (ret) goto err; *val = readl(regs + B53_SRAB_RD_L); err: b53_srab_release_grant(dev); return ret; } static int b53_srab_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val) { u8 __iomem *regs = dev->priv; int ret = 0; ret = b53_srab_request_grant(dev); if (ret) goto err; ret = b53_srab_op(dev, page, reg, 0); if (ret) goto err; *val = readl(regs + B53_SRAB_RD_L); *val += ((u64)readl(regs + B53_SRAB_RD_H) & 0xffff) << 32; err: b53_srab_release_grant(dev); return ret; } static int b53_srab_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val) { u8 __iomem *regs = dev->priv; int ret = 0; ret = b53_srab_request_grant(dev); if (ret) goto err; ret = b53_srab_op(dev, page, reg, 0); if (ret) goto err; *val = readl(regs + B53_SRAB_RD_L); *val += (u64)readl(regs + B53_SRAB_RD_H) << 32; err: b53_srab_release_grant(dev); return ret; } static int b53_srab_write8(struct b53_device *dev, u8 page, u8 reg, u8 value) { u8 __iomem *regs = dev->priv; int ret = 0; ret = b53_srab_request_grant(dev); if (ret) goto err; writel(value, regs + B53_SRAB_WD_L); ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE); err: b53_srab_release_grant(dev); return ret; } static int b53_srab_write16(struct b53_device *dev, u8 page, u8 reg, u16 value) { u8 __iomem *regs = dev->priv; int ret = 0; ret = b53_srab_request_grant(dev); if (ret) goto err; writel(value, regs + B53_SRAB_WD_L); ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE); err: b53_srab_release_grant(dev); return ret; } static int b53_srab_write32(struct b53_device *dev, u8 page, u8 reg, u32 value) { u8 __iomem *regs = dev->priv; int ret = 0; ret = b53_srab_request_grant(dev); if (ret) goto err; writel(value, regs + B53_SRAB_WD_L); ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE); err: b53_srab_release_grant(dev); return ret; } static int b53_srab_write48(struct b53_device *dev, u8 page, u8 reg, u64 value) { u8 __iomem *regs = dev->priv; int ret = 0; ret = b53_srab_request_grant(dev); if (ret) goto err; writel((u32)value, regs + B53_SRAB_WD_L); writel((u16)(value >> 32), regs + B53_SRAB_WD_H); ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE); err: b53_srab_release_grant(dev); return ret; } static int b53_srab_write64(struct b53_device *dev, u8 page, u8 reg, u64 value) { u8 __iomem *regs = dev->priv; int ret = 0; ret = b53_srab_request_grant(dev); if (ret) goto err; writel((u32)value, regs + B53_SRAB_WD_L); writel((u32)(value >> 32), regs + B53_SRAB_WD_H); ret = b53_srab_op(dev, page, reg, B53_SRAB_CMDSTAT_WRITE); err: b53_srab_release_grant(dev); return ret; } static struct b53_io_ops b53_srab_ops = { .read8 = b53_srab_read8, .read16 = b53_srab_read16, .read32 = b53_srab_read32, .read48 = b53_srab_read48, .read64 = b53_srab_read64, .write8 = b53_srab_write8, .write16 = b53_srab_write16, .write32 = b53_srab_write32, .write48 = b53_srab_write48, .write64 = b53_srab_write64, }; static int b53_srab_probe(struct platform_device *pdev) { struct b53_platform_data *pdata = pdev->dev.platform_data; struct b53_device *dev; if (!pdata) return -EINVAL; dev = b53_swconfig_switch_alloc(&pdev->dev, &b53_srab_ops, pdata->regs); if (!dev) return -ENOMEM; if (pdata) dev->pdata = pdata; platform_set_drvdata(pdev, dev); return b53_swconfig_switch_register(dev); } static int b53_srab_remove(struct platform_device *pdev) { struct b53_device *dev = platform_get_drvdata(pdev); if (dev) b53_switch_remove(dev); return 0; } static struct platform_driver b53_srab_driver = { .probe = b53_srab_probe, .remove = b53_srab_remove, .driver = { .name = "b53-srab-switch", }, }; module_platform_driver(b53_srab_driver); MODULE_AUTHOR("Hauke Mehrtens "); MODULE_DESCRIPTION("B53 Switch Register Access Bridge Registers (SRAB) access driver"); MODULE_LICENSE("Dual BSD/GPL");