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180 lines
5.0 KiB
180 lines
5.0 KiB
/* |
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* OMAP clockdomain support |
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* |
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* Copyright (C) 2013 Texas Instruments, Inc. |
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* |
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* Tero Kristo <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any |
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* kind, whether express or implied; without even the implied warranty |
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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#include <linux/clk.h> |
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#include <linux/clk-provider.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/clk/ti.h> |
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#include "clock.h" |
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#undef pr_fmt |
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#define pr_fmt(fmt) "%s: " fmt, __func__ |
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/** |
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* omap2_clkops_enable_clkdm - increment usecount on clkdm of @hw |
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* @hw: struct clk_hw * of the clock being enabled |
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* |
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* Increment the usecount of the clockdomain of the clock pointed to |
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* by @hw; if the usecount is 1, the clockdomain will be "enabled." |
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* Only needed for clocks that don't use omap2_dflt_clk_enable() as |
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* their enable function pointer. Passes along the return value of |
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* clkdm_clk_enable(), -EINVAL if @hw is not associated with a |
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* clockdomain, or 0 if clock framework-based clockdomain control is |
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* not implemented. |
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*/ |
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int omap2_clkops_enable_clkdm(struct clk_hw *hw) |
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{ |
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struct clk_hw_omap *clk; |
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int ret = 0; |
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clk = to_clk_hw_omap(hw); |
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if (unlikely(!clk->clkdm)) { |
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pr_err("%s: %s: no clkdm set ?!\n", __func__, |
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clk_hw_get_name(hw)); |
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return -EINVAL; |
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} |
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if (ti_clk_get_features()->flags & TI_CLK_DISABLE_CLKDM_CONTROL) { |
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pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n", |
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__func__, clk_hw_get_name(hw)); |
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return 0; |
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} |
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ret = ti_clk_ll_ops->clkdm_clk_enable(clk->clkdm, hw->clk); |
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WARN(ret, "%s: could not enable %s's clockdomain %s: %d\n", |
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__func__, clk_hw_get_name(hw), clk->clkdm_name, ret); |
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return ret; |
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} |
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/** |
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* omap2_clkops_disable_clkdm - decrement usecount on clkdm of @hw |
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* @hw: struct clk_hw * of the clock being disabled |
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* |
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* Decrement the usecount of the clockdomain of the clock pointed to |
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* by @hw; if the usecount is 0, the clockdomain will be "disabled." |
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* Only needed for clocks that don't use omap2_dflt_clk_disable() as their |
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* disable function pointer. No return value. |
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*/ |
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void omap2_clkops_disable_clkdm(struct clk_hw *hw) |
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{ |
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struct clk_hw_omap *clk; |
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clk = to_clk_hw_omap(hw); |
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if (unlikely(!clk->clkdm)) { |
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pr_err("%s: %s: no clkdm set ?!\n", __func__, |
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clk_hw_get_name(hw)); |
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return; |
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} |
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if (ti_clk_get_features()->flags & TI_CLK_DISABLE_CLKDM_CONTROL) { |
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pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n", |
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__func__, clk_hw_get_name(hw)); |
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return; |
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} |
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ti_clk_ll_ops->clkdm_clk_disable(clk->clkdm, hw->clk); |
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} |
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/** |
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* omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk |
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* @hw: Pointer to clk_hw_omap used to obtain OMAP clock struct ptr to use |
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* |
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* Convert a clockdomain name stored in a struct clk 'clk' into a |
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* clockdomain pointer, and save it into the struct clk. Intended to be |
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* called during clk_register(). Returns 0 on success, -EERROR otherwise. |
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*/ |
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int omap2_init_clk_clkdm(struct clk_hw *hw) |
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{ |
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struct clk_hw_omap *clk = to_clk_hw_omap(hw); |
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struct clockdomain *clkdm; |
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const char *clk_name; |
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if (!clk->clkdm_name) |
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return 0; |
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clk_name = __clk_get_name(hw->clk); |
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clkdm = ti_clk_ll_ops->clkdm_lookup(clk->clkdm_name); |
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if (clkdm) { |
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pr_debug("clock: associated clk %s to clkdm %s\n", |
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clk_name, clk->clkdm_name); |
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clk->clkdm = clkdm; |
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} else { |
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pr_debug("clock: could not associate clk %s to clkdm %s\n", |
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clk_name, clk->clkdm_name); |
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} |
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return 0; |
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} |
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static void __init of_ti_clockdomain_setup(struct device_node *node) |
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{ |
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struct clk *clk; |
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struct clk_hw *clk_hw; |
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const char *clkdm_name = node->name; |
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int i; |
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unsigned int num_clks; |
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num_clks = of_clk_get_parent_count(node); |
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for (i = 0; i < num_clks; i++) { |
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clk = of_clk_get(node, i); |
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if (IS_ERR(clk)) { |
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pr_err("%s: Failed get %pOF' clock nr %d (%ld)\n", |
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__func__, node, i, PTR_ERR(clk)); |
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continue; |
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} |
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clk_hw = __clk_get_hw(clk); |
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if (!omap2_clk_is_hw_omap(clk_hw)) { |
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pr_warn("can't setup clkdm for basic clk %s\n", |
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__clk_get_name(clk)); |
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clk_put(clk); |
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continue; |
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} |
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to_clk_hw_omap(clk_hw)->clkdm_name = clkdm_name; |
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omap2_init_clk_clkdm(clk_hw); |
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clk_put(clk); |
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} |
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} |
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static const struct of_device_id ti_clkdm_match_table[] __initconst = { |
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{ .compatible = "ti,clockdomain" }, |
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{ } |
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}; |
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/** |
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* ti_dt_clockdomains_setup - setup device tree clockdomains |
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* |
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* Initializes clockdomain nodes for a SoC. This parses through all the |
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* nodes with compatible = "ti,clockdomain", and add the clockdomain |
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* info for all the clocks listed under these. This function shall be |
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* called after rest of the DT clock init has completed and all |
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* clock nodes have been registered. |
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*/ |
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void __init ti_dt_clockdomains_setup(void) |
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{ |
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struct device_node *np; |
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for_each_matching_node(np, ti_clkdm_match_table) { |
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of_ti_clockdomain_setup(np); |
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} |
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}
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