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163 lines
3.6 KiB
163 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright 2015 Chen-Yu Tsai |
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* |
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* Chen-Yu Tsai <[email protected]> |
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*/ |
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#include <linux/clk-provider.h> |
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#include <linux/io.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/reset-controller.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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static DEFINE_SPINLOCK(ve_lock); |
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#define SUN4I_VE_ENABLE 31 |
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#define SUN4I_VE_DIVIDER_SHIFT 16 |
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#define SUN4I_VE_DIVIDER_WIDTH 3 |
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#define SUN4I_VE_RESET 0 |
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/* |
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* sunxi_ve_reset... - reset bit in ve clk registers handling |
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*/ |
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struct ve_reset_data { |
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void __iomem *reg; |
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spinlock_t *lock; |
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struct reset_controller_dev rcdev; |
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}; |
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static int sunxi_ve_reset_assert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct ve_reset_data *data = container_of(rcdev, |
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struct ve_reset_data, |
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rcdev); |
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unsigned long flags; |
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u32 reg; |
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spin_lock_irqsave(data->lock, flags); |
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reg = readl(data->reg); |
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writel(reg & ~BIT(SUN4I_VE_RESET), data->reg); |
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spin_unlock_irqrestore(data->lock, flags); |
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return 0; |
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} |
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static int sunxi_ve_reset_deassert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct ve_reset_data *data = container_of(rcdev, |
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struct ve_reset_data, |
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rcdev); |
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unsigned long flags; |
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u32 reg; |
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spin_lock_irqsave(data->lock, flags); |
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reg = readl(data->reg); |
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writel(reg | BIT(SUN4I_VE_RESET), data->reg); |
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spin_unlock_irqrestore(data->lock, flags); |
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return 0; |
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} |
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static int sunxi_ve_of_xlate(struct reset_controller_dev *rcdev, |
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const struct of_phandle_args *reset_spec) |
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{ |
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if (WARN_ON(reset_spec->args_count != 0)) |
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return -EINVAL; |
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return 0; |
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} |
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static const struct reset_control_ops sunxi_ve_reset_ops = { |
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.assert = sunxi_ve_reset_assert, |
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.deassert = sunxi_ve_reset_deassert, |
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}; |
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static void __init sun4i_ve_clk_setup(struct device_node *node) |
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{ |
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struct clk *clk; |
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struct clk_divider *div; |
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struct clk_gate *gate; |
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struct ve_reset_data *reset_data; |
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const char *parent; |
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const char *clk_name = node->name; |
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void __iomem *reg; |
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int err; |
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reg = of_io_request_and_map(node, 0, of_node_full_name(node)); |
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if (IS_ERR(reg)) |
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return; |
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div = kzalloc(sizeof(*div), GFP_KERNEL); |
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if (!div) |
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goto err_unmap; |
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gate = kzalloc(sizeof(*gate), GFP_KERNEL); |
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if (!gate) |
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goto err_free_div; |
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of_property_read_string(node, "clock-output-names", &clk_name); |
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parent = of_clk_get_parent_name(node, 0); |
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gate->reg = reg; |
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gate->bit_idx = SUN4I_VE_ENABLE; |
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gate->lock = &ve_lock; |
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div->reg = reg; |
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div->shift = SUN4I_VE_DIVIDER_SHIFT; |
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div->width = SUN4I_VE_DIVIDER_WIDTH; |
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div->lock = &ve_lock; |
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clk = clk_register_composite(NULL, clk_name, &parent, 1, |
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NULL, NULL, |
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&div->hw, &clk_divider_ops, |
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&gate->hw, &clk_gate_ops, |
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CLK_SET_RATE_PARENT); |
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if (IS_ERR(clk)) |
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goto err_free_gate; |
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err = of_clk_add_provider(node, of_clk_src_simple_get, clk); |
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if (err) |
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goto err_unregister_clk; |
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reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL); |
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if (!reset_data) |
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goto err_del_provider; |
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reset_data->reg = reg; |
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reset_data->lock = &ve_lock; |
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reset_data->rcdev.nr_resets = 1; |
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reset_data->rcdev.ops = &sunxi_ve_reset_ops; |
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reset_data->rcdev.of_node = node; |
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reset_data->rcdev.of_xlate = sunxi_ve_of_xlate; |
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reset_data->rcdev.of_reset_n_cells = 0; |
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err = reset_controller_register(&reset_data->rcdev); |
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if (err) |
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goto err_free_reset; |
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return; |
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err_free_reset: |
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kfree(reset_data); |
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err_del_provider: |
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of_clk_del_provider(node); |
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err_unregister_clk: |
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clk_unregister(clk); |
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err_free_gate: |
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kfree(gate); |
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err_free_div: |
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kfree(div); |
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err_unmap: |
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iounmap(reg); |
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} |
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CLK_OF_DECLARE(sun4i_ve, "allwinner,sun4i-a10-ve-clk", |
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sun4i_ve_clk_setup);
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