| 1 | |
| 2 | |
| 3 | * OMAP clockdomain support
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| 4 | *
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| 5 | * Copyright (C) 2013 Texas Instruments, Inc.
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| 6 | *
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| 7 | * Tero Kristo <[email protected]>
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| 8 |
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| 9 |
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| 10 | #include <linux/clk.h>
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| 11 | #include <linux/clk-provider.h>
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| 12 | #include <linux/slab.h>
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| 13 | #include <linux/of.h>
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| 14 | #include <linux/of_address.h>
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| 15 | #include <linux/clk/ti.h>
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| 16 |
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| 17 | #include "clock.h"
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| 18 |
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| 19 | #undef pr_fmt
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| 20 | #define pr_fmt(fmt) "%s: " fmt, __func__
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| 21 |
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| 22 | |
| 23 | * omap2_clkops_enable_clkdm - increment usecount on clkdm of @hw
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| 24 | * @hw: struct clk_hw * of the clock being enabled
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| 25 | *
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| 26 | * Increment the usecount of the clockdomain of the clock pointed to
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| 27 | * by @hw; if the usecount is 1, the clockdomain will be "enabled."
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| 28 | * Only needed for clocks that don't use omap2_dflt_clk_enable() as
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| 29 | * their enable function pointer. Passes along the return value of
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| 30 | * clkdm_clk_enable(), -EINVAL if @hw is not associated with a
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| 31 | * clockdomain, or 0 if clock framework-based clockdomain control is
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| 32 | * not implemented.
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| 33 |
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| 34 | int omap2_clkops_enable_clkdm(struct clk_hw *hw)
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| 35 | {
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| 36 | struct clk_hw_omap *clk;
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| 37 | int ret = 0;
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| 38 |
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| 39 | clk = to_clk_hw_omap(hw);
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| 40 |
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| 41 | if (unlikely(!clk->clkdm)) {
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| 42 | pr_err("%s: %s: no clkdm set ?!\n", __func__,
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| 43 | clk_hw_get_name(hw));
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| 44 | return -EINVAL;
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| 45 | }
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| 46 |
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| 47 | if (ti_clk_get_features()->flags & TI_CLK_DISABLE_CLKDM_CONTROL) {
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| 48 | pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n",
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| 49 | __func__, clk_hw_get_name(hw));
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| 50 | return 0;
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| 51 | }
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| 52 |
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| 53 | ret = ti_clk_ll_ops->clkdm_clk_enable(clk->clkdm, hw->clk);
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| 54 | WARN(ret, "%s: could not enable %s's clockdomain %s: %d\n",
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| 55 | __func__, clk_hw_get_name(hw), clk->clkdm_name, ret);
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| 56 |
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| 57 | return ret;
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| 58 | }
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| 59 |
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| 60 | |
| 61 | * omap2_clkops_disable_clkdm - decrement usecount on clkdm of @hw
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| 62 | * @hw: struct clk_hw * of the clock being disabled
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| 63 | *
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| 64 | * Decrement the usecount of the clockdomain of the clock pointed to
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| 65 | * by @hw; if the usecount is 0, the clockdomain will be "disabled."
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| 66 | * Only needed for clocks that don't use omap2_dflt_clk_disable() as their
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| 67 | * disable function pointer. No return value.
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| 68 |
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| 69 | void omap2_clkops_disable_clkdm(struct clk_hw *hw)
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| 70 | {
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| 71 | struct clk_hw_omap *clk;
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| 72 |
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| 73 | clk = to_clk_hw_omap(hw);
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| 74 |
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| 75 | if (unlikely(!clk->clkdm)) {
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| 76 | pr_err("%s: %s: no clkdm set ?!\n", __func__,
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| 77 | clk_hw_get_name(hw));
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| 78 | return;
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| 79 | }
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| 80 |
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| 81 | if (ti_clk_get_features()->flags & TI_CLK_DISABLE_CLKDM_CONTROL) {
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| 82 | pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n",
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| 83 | __func__, clk_hw_get_name(hw));
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| 84 | return;
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| 85 | }
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| 86 |
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| 87 | ti_clk_ll_ops->clkdm_clk_disable(clk->clkdm, hw->clk);
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| 88 | }
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| 89 |
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| 90 | |
| 91 | * omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk
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| 92 | * @hw: Pointer to clk_hw_omap used to obtain OMAP clock struct ptr to use
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| 93 | *
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| 94 | * Convert a clockdomain name stored in a struct clk 'clk' into a
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| 95 | * clockdomain pointer, and save it into the struct clk. Intended to be
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| 96 | * called during clk_register(). Returns 0 on success, -EERROR otherwise.
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| 97 |
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| 98 | int omap2_init_clk_clkdm(struct clk_hw *hw)
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| 99 | {
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| 100 | struct clk_hw_omap *clk = to_clk_hw_omap(hw);
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| 101 | struct clockdomain *clkdm;
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| 102 | const char *clk_name;
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| 103 |
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| 104 | if (!clk->clkdm_name)
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| 105 | return 0;
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| 106 |
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| 107 | clk_name = __clk_get_name(hw->clk);
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| 108 |
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| 109 | clkdm = ti_clk_ll_ops->clkdm_lookup(clk->clkdm_name);
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| 110 | if (clkdm) {
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| 111 | pr_debug("clock: associated clk %s to clkdm %s\n",
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| 112 | clk_name, clk->clkdm_name);
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| 113 | clk->clkdm = clkdm;
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| 114 | } else {
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| 115 | pr_debug("clock: could not associate clk %s to clkdm %s\n",
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| 116 | clk_name, clk->clkdm_name);
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| 117 | }
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| 118 |
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| 119 | return 0;
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| 120 | }
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| 121 |
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| 122 | static void __init of_ti_clockdomain_setup(struct device_node *node)
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| 123 | {
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| 124 | struct clk *clk;
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| 125 | struct clk_hw *clk_hw;
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| 126 | const char *clkdm_name = ti_dt_clk_name(node);
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| 127 | int i;
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| 128 | unsigned int num_clks;
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| 129 |
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| 130 | num_clks = of_clk_get_parent_count(node);
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| 131 |
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| 132 | for (i = 0; i < num_clks; i++) {
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| 133 | clk = of_clk_get(node, i);
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| 134 | if (IS_ERR(clk)) {
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| 135 | pr_err("%s: Failed get %pOF' clock nr %d (%ld)\n",
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| 136 | __func__, node, i, PTR_ERR(clk));
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| 137 | continue;
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| 138 | }
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| 139 | clk_hw = __clk_get_hw(clk);
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| 140 | if (!omap2_clk_is_hw_omap(clk_hw)) {
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| 141 | pr_warn("can't setup clkdm for basic clk %s\n",
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| 142 | __clk_get_name(clk));
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| 143 | clk_put(clk);
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| 144 | continue;
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| 145 | }
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| 146 | to_clk_hw_omap(clk_hw)->clkdm_name = clkdm_name;
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| 147 | omap2_init_clk_clkdm(clk_hw);
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| 148 | clk_put(clk);
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| 149 | }
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| 150 | }
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| 151 |
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| 152 | static const struct of_device_id ti_clkdm_match_table[] __initconst = {
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| 153 | { .compatible = "ti,clockdomain" },
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| 154 | { }
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| 155 | };
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| 156 |
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| 157 | |
| 158 | * ti_dt_clockdomains_setup - setup device tree clockdomains
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| 159 | *
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| 160 | * Initializes clockdomain nodes for a SoC. This parses through all the
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| 161 | * nodes with compatible = "ti,clockdomain", and add the clockdomain
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| 162 | * info for all the clocks listed under these. This function shall be
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| 163 | * called after rest of the DT clock init has completed and all
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| 164 | * clock nodes have been registered.
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| 165 |
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| 166 | void __init ti_dt_clockdomains_setup(void)
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| 167 | {
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| 168 | struct device_node *np;
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| 169 | for_each_matching_node(np, ti_clkdm_match_table) {
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| 170 | of_ti_clockdomain_setup(np);
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| 171 | }
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| 172 | }
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