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
__s5p_mipi_phy_control(struct platform_device * pdev,bool on,u32 reset)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
s5p_csis_phy_enable(struct platform_device * pdev,bool on)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
s5p_dsim_phy_enable(struct platform_device * pdev,bool on)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 }
64