LXR linux/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
  76struct 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
  87struct 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};
 110
 111/* Clock flags: SoC-specific flags start at BIT(16) */
 112#define ALWAYS_ENABLED          BIT(1)
 113#define CLK_PSC                 BIT(2)
 114#define CLK_PLL                 BIT(3) /* PLL-derived clock */
 115#define PRE_PLL                 BIT(4) /* source is before PLL mult/div */
 116#define PSC_SWRSTDISABLE        BIT(5) /* Disable state is SwRstDisable */
 117#define PSC_FORCE               BIT(6) /* Force module state transtition */
 118#define PSC_LRST                BIT(8) /* Use local reset on enable/disable */
 119
 120#define CLK(dev, con, ck)       \
 121        {                       \
 122                .dev_id = dev,  \
 123                .con_id = con,  \
 124                .clk = ck,      \
 125        }                       \
 126
 127int davinci_clk_init(struct clk_lookup *clocks);
 128int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv,
 129                                unsigned int mult, unsigned int postdiv);
 130int davinci_set_sysclk_rate(struct clk *clk, unsigned long rate);
 131int davinci_set_refclk_rate(unsigned long rate);
 132int davinci_simple_set_rate(struct clk *clk, unsigned long rate);
 133int davinci_clk_reset(struct clk *clk, bool reset);
 134
 135extern struct platform_device davinci_wdt_device;
 136extern void davinci_watchdog_reset(struct platform_device *);
 137
 138#endif
 139
 140#endif
 141