Robert Jarzmik | bda0030 | 2014-07-30 22:50:59 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Marvell PXA family clocks |
| 3 | * |
| 4 | * Copyright (C) 2014 Robert Jarzmik |
| 5 | * |
| 6 | * Common clock code for PXA clocks ("CKEN" type clocks + DT) |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; version 2 of the License. |
| 11 | * |
| 12 | */ |
| 13 | #include <linux/clk.h> |
| 14 | #include <linux/clk-provider.h> |
| 15 | #include <linux/clkdev.h> |
| 16 | #include <linux/of.h> |
| 17 | |
| 18 | #include <dt-bindings/clock/pxa-clock.h> |
| 19 | #include "clk-pxa.h" |
| 20 | |
| 21 | DEFINE_SPINLOCK(lock); |
| 22 | |
| 23 | static struct clk *pxa_clocks[CLK_MAX]; |
| 24 | static struct clk_onecell_data onecell_data = { |
| 25 | .clks = pxa_clocks, |
| 26 | .clk_num = CLK_MAX, |
| 27 | }; |
| 28 | |
Robert Jarzmik | 14dd5b0 | 2014-10-07 01:07:58 +0200 | [diff] [blame] | 29 | struct pxa_clk { |
| 30 | struct clk_hw hw; |
| 31 | struct clk_fixed_factor lp; |
| 32 | struct clk_fixed_factor hp; |
| 33 | struct clk_gate gate; |
| 34 | bool (*is_in_low_power)(void); |
| 35 | }; |
| 36 | |
| 37 | #define to_pxa_clk(_hw) container_of(_hw, struct pxa_clk, hw) |
Robert Jarzmik | bda0030 | 2014-07-30 22:50:59 +0200 | [diff] [blame] | 38 | |
| 39 | static unsigned long cken_recalc_rate(struct clk_hw *hw, |
| 40 | unsigned long parent_rate) |
| 41 | { |
Robert Jarzmik | 14dd5b0 | 2014-10-07 01:07:58 +0200 | [diff] [blame] | 42 | struct pxa_clk *pclk = to_pxa_clk(hw); |
Robert Jarzmik | bda0030 | 2014-07-30 22:50:59 +0200 | [diff] [blame] | 43 | struct clk_fixed_factor *fix; |
| 44 | |
| 45 | if (!pclk->is_in_low_power || pclk->is_in_low_power()) |
| 46 | fix = &pclk->lp; |
| 47 | else |
| 48 | fix = &pclk->hp; |
| 49 | fix->hw.clk = hw->clk; |
| 50 | return clk_fixed_factor_ops.recalc_rate(&fix->hw, parent_rate); |
| 51 | } |
| 52 | |
| 53 | static struct clk_ops cken_rate_ops = { |
| 54 | .recalc_rate = cken_recalc_rate, |
| 55 | }; |
| 56 | |
| 57 | static u8 cken_get_parent(struct clk_hw *hw) |
| 58 | { |
Robert Jarzmik | 14dd5b0 | 2014-10-07 01:07:58 +0200 | [diff] [blame] | 59 | struct pxa_clk *pclk = to_pxa_clk(hw); |
Robert Jarzmik | bda0030 | 2014-07-30 22:50:59 +0200 | [diff] [blame] | 60 | |
| 61 | if (!pclk->is_in_low_power) |
| 62 | return 0; |
| 63 | return pclk->is_in_low_power() ? 0 : 1; |
| 64 | } |
| 65 | |
| 66 | static struct clk_ops cken_mux_ops = { |
| 67 | .get_parent = cken_get_parent, |
| 68 | .set_parent = dummy_clk_set_parent, |
| 69 | }; |
| 70 | |
| 71 | void __init clkdev_pxa_register(int ckid, const char *con_id, |
| 72 | const char *dev_id, struct clk *clk) |
| 73 | { |
| 74 | if (!IS_ERR(clk) && (ckid != CLK_NONE)) |
| 75 | pxa_clocks[ckid] = clk; |
| 76 | if (!IS_ERR(clk)) |
| 77 | clk_register_clkdev(clk, con_id, dev_id); |
| 78 | } |
| 79 | |
Robert Jarzmik | 14dd5b0 | 2014-10-07 01:07:58 +0200 | [diff] [blame] | 80 | int __init clk_pxa_cken_init(const struct desc_clk_cken *clks, int nb_clks) |
Robert Jarzmik | bda0030 | 2014-07-30 22:50:59 +0200 | [diff] [blame] | 81 | { |
| 82 | int i; |
Robert Jarzmik | 14dd5b0 | 2014-10-07 01:07:58 +0200 | [diff] [blame] | 83 | struct pxa_clk *pxa_clk; |
Robert Jarzmik | bda0030 | 2014-07-30 22:50:59 +0200 | [diff] [blame] | 84 | struct clk *clk; |
| 85 | |
| 86 | for (i = 0; i < nb_clks; i++) { |
Robert Jarzmik | 14dd5b0 | 2014-10-07 01:07:58 +0200 | [diff] [blame] | 87 | pxa_clk = kzalloc(sizeof(*pxa_clk), GFP_KERNEL); |
| 88 | pxa_clk->is_in_low_power = clks[i].is_in_low_power; |
| 89 | pxa_clk->lp = clks[i].lp; |
| 90 | pxa_clk->hp = clks[i].hp; |
| 91 | pxa_clk->gate = clks[i].gate; |
| 92 | pxa_clk->gate.lock = &lock; |
| 93 | clk = clk_register_composite(NULL, clks[i].name, |
| 94 | clks[i].parent_names, 2, |
| 95 | &pxa_clk->hw, &cken_mux_ops, |
| 96 | &pxa_clk->hw, &cken_rate_ops, |
| 97 | &pxa_clk->gate.hw, &clk_gate_ops, |
| 98 | clks[i].flags); |
| 99 | clkdev_pxa_register(clks[i].ckid, clks[i].con_id, |
| 100 | clks[i].dev_id, clk); |
Robert Jarzmik | bda0030 | 2014-07-30 22:50:59 +0200 | [diff] [blame] | 101 | } |
| 102 | return 0; |
| 103 | } |
| 104 | |
Robert Jarzmik | 6f8a444 | 2014-10-07 01:07:59 +0200 | [diff] [blame] | 105 | void __init clk_pxa_dt_common_init(struct device_node *np) |
Robert Jarzmik | bda0030 | 2014-07-30 22:50:59 +0200 | [diff] [blame] | 106 | { |
| 107 | of_clk_add_provider(np, of_clk_src_onecell_get, &onecell_data); |
| 108 | } |