arch/arm/mach-davinci/clock.h

   1 /*
   2  * TI DaVinci clock definitions
   3  *
   4  * Copyright (C) 2006-2007 Texas Instruments.
   5  * Copyright (C) 2008-2009 Deep Root Systems, LLC
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #ifndef __ARCH_ARM_DAVINCI_CLOCK_H
  13 #define __ARCH_ARM_DAVINCI_CLOCK_H
  14
  15 #define DAVINCI_PLL1_BASE 0x01c40800
  16 #define DAVINCI_PLL2_BASE 0x01c40c00
  17 #define MAX_PLL 2
  18
  19 /* PLL/Reset register offsets */
  20 #define PLLCTL          0x100
  21 #define PLLCTL_PLLEN    BIT(0)
  22 #define PLLCTL_PLLPWRDN BIT(1)
  23 #define PLLCTL_PLLRST   BIT(3)
  24 #define PLLCTL_PLLDIS   BIT(4)
  25 #define PLLCTL_PLLENSRC BIT(5)
  26 #define PLLCTL_CLKMODE  BIT(8)
  27
  28 #define PLLM            0x110
  29 #define PLLM_PLLM_MASK  0xff
  30
  31 #define PREDIV          0x114
  32 #define PLLDIV1         0x118
  33 #define PLLDIV2         0x11c
  34 #define PLLDIV3         0x120
  35 #define POSTDIV         0x128
  36 #define BPDIV           0x12c
  37 #define PLLCMD          0x138
  38 #define PLLSTAT         0x13c
  39 #define PLLALNCTL       0x140
  40 #define PLLDCHANGE      0x144
  41 #define PLLCKEN         0x148
  42 #define PLLCKSTAT       0x14c
  43 #define PLLSYSTAT       0x150
  44 #define PLLDIV4         0x160
  45 #define PLLDIV5         0x164
  46 #define PLLDIV6         0x168
  47 #define PLLDIV7         0x16c
  48 #define PLLDIV8         0x170
  49 #define PLLDIV9         0x174
  50 #define PLLDIV_EN       BIT(15)
  51 #define PLLDIV_RATIO_MASK 0x1f
  52
  53 /*
  54  * OMAP-L138 system reference guide recommends a wait for 4 OSCIN/CLKIN
  55  * cycles to ensure that the PLLC has switched to bypass mode. Delay of 1us
  56  * ensures we are good for all > 4MHz OSCIN/CLKIN inputs. Typically the input
  57  * is ~25MHz. Units are micro seconds.
  58  */
  59 #define PLL_BYPASS_TIME         1
  60 /* From OMAP-L138 datasheet table 6-4. Units are micro seconds */
  61 #define PLL_RESET_TIME          1
  62 /*
  63  * From OMAP-L138 datasheet table 6-4; assuming prediv = 1, sqrt(pllm) = 4
  64  * Units are micro seconds.
  65  */
  66 #define PLL_LOCK_TIME           20
  67
  68 #ifndef __ASSEMBLER__
  69
  70 #include <linux/list.h>
  71 #include <linux/clkdev.h>
  72
  73 #define PLLSTAT_GOSTAT  BIT(0)
  74 #define PLLCMD_GOSET    BIT(0)
  75
  76 struct pll_data {
  77         u32 phys_base;
  78         void __iomem *base;
  79         u32 num;
  80         u32 flags;
  81         u32 input_rate;
  82         u32 div_ratio_mask;
  83 };
  84 #define PLL_HAS_PREDIV          0x01
  85 #define PLL_HAS_POSTDIV         0x02
  86
  87 struct clk {
  88         struct list_head        node;
  89         struct module           *owner;
  90         const char              *name;
  91         unsigned long           rate;
  92         unsigned long           maxrate;        /* H/W supported max rate */
  93         u8                      usecount;
  94         u8                      lpsc;
  95         u8                      gpsc;
  96         u8                      domain;
  97         u32                     flags;
  98         struct clk              *parent;
  99         struct list_head        children;       /* list of children */
 100         struct list_head        childnode;      /* parent's child list node */
 101         struct pll_data         *pll_data;
 102         u32                     div_reg;
 103         unsigned long (*recalc) (struct clk *);
 104         int (*set_rate) (struct clk *clk, unsigned long rate);
 105         int (*round_rate) (struct clk *clk, unsigned long rate);
 106         int (*reset) (struct clk *clk, bool reset);
 107         void (*clk_enable) (struct clk *clk);
 108         void (*clk_disable) (struct clk *clk);
 109         int (*set_parent) (struct clk *clk, struct clk *parent);
 110 };
 111
 112 /* Clock flags: SoC-specific flags start at BIT(16) */
 113 #define ALWAYS_ENABLED          BIT(1)
 114 #define CLK_PSC                 BIT(2)
 115 #define CLK_PLL                 BIT(3) /* PLL-derived clock */
 116 #define PRE_PLL                 BIT(4) /* source is before PLL mult/div */
 117 #define PSC_SWRSTDISABLE        BIT(5) /* Disable state is SwRstDisable */
 118 #define PSC_FORCE               BIT(6) /* Force module state transtition */
 119 #define PSC_LRST                BIT(8) /* Use local reset on enable/disable */
 120
 121 #define CLK(dev, con, ck)       \
 122         {                       \
 123                 .dev_id = dev,  \
 124                 .con_id = con,  \
 125                 .clk = ck,      \
 126         }                       \
 127
 128 int davinci_clk_init(struct clk_lookup *clocks);
 129 int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv,
 130                                 unsigned int mult, unsigned int postdiv);
 131 int davinci_set_sysclk_rate(struct clk *clk, unsigned long rate);
 132 int davinci_set_refclk_rate(unsigned long rate);
 133 int davinci_simple_set_rate(struct clk *clk, unsigned long rate);
 134 int davinci_clk_reset(struct clk *clk, bool reset);
 135 void davinci_clk_enable(struct clk *clk);
 136 void davinci_clk_disable(struct clk *clk);
 137
 138 extern struct platform_device davinci_wdt_device;
 139 extern void davinci_watchdog_reset(struct platform_device *);
 140
 141 #endif
 142
 143 #endif