LXR linux/arch/arm/plat-samsung/setup-mipiphy.c

   1/*
   2 * Copyright (C) 2011 Samsung Electronics Co., Ltd.
   3 *
   4 * S5P - Helper functions for MIPI-CSIS and MIPI-DSIM D-PHY control
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#include <linux/kernel.h>
  12#include <linux/platform_device.h>
  13#include <linux/io.h>
  14#include <linux/spinlock.h>
  15#include <mach/regs-clock.h>
  16
  17static int __s5p_mipi_phy_control(int id, bool on, u32 reset)
  18{
  19        static DEFINE_SPINLOCK(lock);
  20        void __iomem *addr;
  21        unsigned long flags;
  22        u32 cfg;
  23
  24        id = max(0, id);
  25        if (id > 1)
  26                return -EINVAL;
  27
  28        addr = S5P_MIPI_DPHY_CONTROL(id);
  29
  30        spin_lock_irqsave(&lock, flags);
  31
  32        cfg = __raw_readl(addr);
  33        cfg = on ? (cfg | reset) : (cfg & ~reset);
  34        __raw_writel(cfg, addr);
  35
  36        if (on) {
  37                cfg |= S5P_MIPI_DPHY_ENABLE;
  38        } else if (!(cfg & (S5P_MIPI_DPHY_SRESETN |
  39                            S5P_MIPI_DPHY_MRESETN) & ~reset)) {
  40                cfg &= ~S5P_MIPI_DPHY_ENABLE;
  41        }
  42
  43        __raw_writel(cfg, addr);
  44        spin_unlock_irqrestore(&lock, flags);
  45
  46        return 0;
  47}
  48
  49int s5p_csis_phy_enable(int id, bool on)
  50{
  51        return __s5p_mipi_phy_control(id, on, S5P_MIPI_DPHY_SRESETN);
  52}
  53
  54int s5p_dsim_phy_enable(struct platform_device *pdev, bool on)
  55{
  56        return __s5p_mipi_phy_control(pdev->id, on, S5P_MIPI_DPHY_MRESETN);
  57}
  58