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 }; 108 109 /* Clock flags: SoC-specific flags start at BIT(16) */ 110 #define ALWAYS_ENABLED BIT(1) 111 #define CLK_PSC BIT(2) 112 #define CLK_PLL BIT(3) /* PLL-derived clock */ 113 #define PRE_PLL BIT(4) /* source is before PLL mult/div */ 114 #define PSC_SWRSTDISABLE BIT(5) /* Disable state is SwRstDisable */ 115 #define PSC_FORCE BIT(6) /* Force module state transtition */ 116 #define PSC_LRST BIT(8) /* Use local reset on enable/disable */ 117 118 #define CLK(dev, con, ck) \ 119 { \ 120 .dev_id = dev, \ 121 .con_id = con, \ 122 .clk = ck, \ 123 } \ 124 125 int davinci_clk_init(struct clk_lookup *clocks); 126 int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv, 127 unsigned int mult, unsigned int postdiv); 128 int davinci_set_sysclk_rate(struct clk *clk, unsigned long rate); 129 int davinci_set_refclk_rate(unsigned long rate); 130 int davinci_simple_set_rate(struct clk *clk, unsigned long rate); 131 int davinci_clk_reset(struct clk *clk, bool reset); 132 133 extern struct platform_device davinci_wdt_device; 134 extern void davinci_watchdog_reset(struct platform_device *); 135 136 #endif 137 138 #endif 139