| viresh kumar | 8c0236f | 2010-04-01 12:30:46 +0100 | [diff] [blame] | 1 | /* |
| 2 | * arch/arm/plat-spear/include/plat/clock.h |
| 3 | * |
| 4 | * Clock framework definitions for SPEAr platform |
| 5 | * |
| 6 | * Copyright (C) 2009 ST Microelectronics |
| 7 | * Viresh Kumar<viresh.kumar@st.com> |
| 8 | * |
| 9 | * This file is licensed under the terms of the GNU General Public |
| 10 | * License version 2. This program is licensed "as is" without any |
| 11 | * warranty of any kind, whether express or implied. |
| 12 | */ |
| 13 | |
| 14 | #ifndef __PLAT_CLOCK_H |
| 15 | #define __PLAT_CLOCK_H |
| 16 | |
| 17 | #include <linux/list.h> |
| 18 | #include <asm/clkdev.h> |
| 19 | #include <linux/types.h> |
| 20 | |
| 21 | /* clk structure flags */ |
| 22 | #define ALWAYS_ENABLED (1 << 0) /* clock always enabled */ |
| 23 | #define RESET_TO_ENABLE (1 << 1) /* reset register bit to enable clk */ |
| 24 | |
| 25 | /** |
| 26 | * struct clkops - clock operations |
| 27 | * @enable: pointer to clock enable function |
| 28 | * @disable: pointer to clock disable function |
| 29 | */ |
| 30 | struct clkops { |
| 31 | int (*enable) (struct clk *); |
| 32 | void (*disable) (struct clk *); |
| 33 | }; |
| 34 | |
| 35 | /** |
| 36 | * struct pclk_info - parents info |
| 37 | * @pclk: pointer to parent clk |
| 38 | * @pclk_mask: value to be written for selecting this parent |
| 39 | * @scalable: Is parent scalable (1 - YES, 0 - NO) |
| 40 | */ |
| 41 | struct pclk_info { |
| 42 | struct clk *pclk; |
| 43 | u8 pclk_mask; |
| 44 | u8 scalable; |
| 45 | }; |
| 46 | |
| 47 | /** |
| 48 | * struct pclk_sel - parents selection configuration |
| 49 | * @pclk_info: pointer to array of parent clock info |
| 50 | * @pclk_count: number of parents |
| 51 | * @pclk_sel_reg: register for selecting a parent |
| 52 | * @pclk_sel_mask: mask for selecting parent (can be used to clear bits also) |
| 53 | */ |
| 54 | struct pclk_sel { |
| 55 | struct pclk_info *pclk_info; |
| 56 | u8 pclk_count; |
| 57 | unsigned int *pclk_sel_reg; |
| 58 | unsigned int pclk_sel_mask; |
| 59 | }; |
| 60 | |
| 61 | /** |
| 62 | * struct clk - clock structure |
| 63 | * @usage_count: num of users who enabled this clock |
| 64 | * @flags: flags for clock properties |
| 65 | * @rate: programmed clock rate in Hz |
| 66 | * @en_reg: clk enable/disable reg |
| 67 | * @en_reg_bit: clk enable/disable bit |
| 68 | * @ops: clk enable/disable ops - generic_clkops selected if NULL |
| 69 | * @recalc: pointer to clock rate recalculate function |
| 70 | * @pclk: current parent clk |
| 71 | * @pclk_sel: pointer to parent selection structure |
| 72 | * @pclk_sel_shift: register shift for selecting parent of this clock |
| 73 | * @children: list for childrens or this clock |
| 74 | * @sibling: node for list of clocks having same parents |
| 75 | * @private_data: clock specific private data |
| 76 | */ |
| 77 | struct clk { |
| 78 | unsigned int usage_count; |
| 79 | unsigned int flags; |
| 80 | unsigned long rate; |
| 81 | unsigned int *en_reg; |
| 82 | u8 en_reg_bit; |
| 83 | const struct clkops *ops; |
| 84 | void (*recalc) (struct clk *); |
| 85 | |
| 86 | struct clk *pclk; |
| 87 | struct pclk_sel *pclk_sel; |
| 88 | unsigned int pclk_sel_shift; |
| 89 | |
| 90 | struct list_head children; |
| 91 | struct list_head sibling; |
| 92 | void *private_data; |
| 93 | }; |
| 94 | |
| 95 | /* pll configuration structure */ |
| 96 | struct pll_clk_config { |
| 97 | unsigned int *mode_reg; |
| 98 | unsigned int *cfg_reg; |
| 99 | }; |
| 100 | |
| 101 | /* ahb and apb bus configuration structure */ |
| 102 | struct bus_clk_config { |
| 103 | unsigned int *reg; |
| 104 | unsigned int mask; |
| 105 | unsigned int shift; |
| 106 | }; |
| 107 | |
| 108 | /* |
| 109 | * Aux clk configuration structure: applicable to GPT, UART and FIRDA |
| 110 | */ |
| 111 | struct aux_clk_config { |
| 112 | unsigned int *synth_reg; |
| 113 | }; |
| 114 | |
| 115 | /* platform specific clock functions */ |
| 116 | void clk_register(struct clk_lookup *cl); |
| 117 | void recalc_root_clocks(void); |
| 118 | |
| 119 | /* clock recalc functions */ |
| 120 | void follow_parent(struct clk *clk); |
| 121 | void pll1_clk_recalc(struct clk *clk); |
| 122 | void bus_clk_recalc(struct clk *clk); |
| 123 | void gpt_clk_recalc(struct clk *clk); |
| 124 | void aux_clk_recalc(struct clk *clk); |
| 125 | |
| 126 | #endif /* __PLAT_CLOCK_H */ |