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
  17 static 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
  49 int s5p_csis_phy_enable(int id, bool on)
  50 {
  51         return __s5p_mipi_phy_control(id, on, S5P_MIPI_DPHY_SRESETN);
  52 }
  53
  54 int 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 }