arch/arm/plat-s5p/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
  17 static int __s5p_mipi_phy_control(struct platform_device *pdev,
  18                                   bool on, u32 reset)
  19 {
  20         static DEFINE_SPINLOCK(lock);
  21         void __iomem *addr;
  22         unsigned long flags;
  23         int pid;
  24         u32 cfg;
  25
  26         if (!pdev)
  27                 return -EINVAL;
  28
  29         pid = (pdev->id == -1) ? 0 : pdev->id;
  30
  31         if (pid != 0 && pid != 1)
  32                 return -EINVAL;
  33
  34         addr = S5P_MIPI_DPHY_CONTROL(pid);
  35
  36         spin_lock_irqsave(&lock, flags);
  37
  38         cfg = __raw_readl(addr);
  39         cfg = on ? (cfg | reset) : (cfg & ~reset);
  40         __raw_writel(cfg, addr);
  41
  42         if (on) {
  43                 cfg |= S5P_MIPI_DPHY_ENABLE;
  44         } else if (!(cfg & (S5P_MIPI_DPHY_SRESETN |
  45                             S5P_MIPI_DPHY_MRESETN) & ~reset)) {
  46                 cfg &= ~S5P_MIPI_DPHY_ENABLE;
  47         }
  48
  49         __raw_writel(cfg, addr);
  50         spin_unlock_irqrestore(&lock, flags);
  51
  52         return 0;
  53 }
  54
  55 int s5p_csis_phy_enable(struct platform_device *pdev, bool on)
  56 {
  57         return __s5p_mipi_phy_control(pdev, on, S5P_MIPI_DPHY_SRESETN);
  58 }
  59
  60 int s5p_dsim_phy_enable(struct platform_device *pdev, bool on)
  61 {
  62         return __s5p_mipi_phy_control(pdev, on, S5P_MIPI_DPHY_MRESETN);
  63 }