258 lines
7.0 KiB
C
258 lines
7.0 KiB
C
/*
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* Copyright 2013-2015 Emilio López
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*
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* Emilio López <emilio@elopez.com.ar>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* 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/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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/**
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* sunxi_usb_reset... - reset bits in usb clk registers handling
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*/
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struct usb_reset_data {
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void __iomem *reg;
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spinlock_t *lock;
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struct clk *clk;
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struct reset_controller_dev rcdev;
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};
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static int sunxi_usb_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct usb_reset_data *data = container_of(rcdev,
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struct usb_reset_data,
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rcdev);
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unsigned long flags;
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u32 reg;
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clk_prepare_enable(data->clk);
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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(id), data->reg);
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spin_unlock_irqrestore(data->lock, flags);
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clk_disable_unprepare(data->clk);
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return 0;
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}
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static int sunxi_usb_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct usb_reset_data *data = container_of(rcdev,
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struct usb_reset_data,
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rcdev);
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unsigned long flags;
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u32 reg;
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clk_prepare_enable(data->clk);
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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(id), data->reg);
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spin_unlock_irqrestore(data->lock, flags);
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clk_disable_unprepare(data->clk);
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return 0;
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}
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static const struct reset_control_ops sunxi_usb_reset_ops = {
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.assert = sunxi_usb_reset_assert,
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.deassert = sunxi_usb_reset_deassert,
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};
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/**
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* sunxi_usb_clk_setup() - Setup function for usb gate clocks
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*/
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#define SUNXI_USB_MAX_SIZE 32
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struct usb_clk_data {
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u32 clk_mask;
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u32 reset_mask;
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bool reset_needs_clk;
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};
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static void __init sunxi_usb_clk_setup(struct device_node *node,
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const struct usb_clk_data *data,
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spinlock_t *lock)
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{
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struct clk_onecell_data *clk_data;
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struct usb_reset_data *reset_data;
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const char *clk_parent;
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const char *clk_name;
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void __iomem *reg;
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int qty;
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int i = 0;
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int j = 0;
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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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clk_parent = of_clk_get_parent_name(node, 0);
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if (!clk_parent)
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return;
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/* Worst-case size approximation and memory allocation */
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qty = find_last_bit((unsigned long *)&data->clk_mask,
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SUNXI_USB_MAX_SIZE);
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clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
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if (!clk_data)
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return;
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clk_data->clks = kzalloc((qty+1) * sizeof(struct clk *), GFP_KERNEL);
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if (!clk_data->clks) {
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kfree(clk_data);
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return;
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}
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for_each_set_bit(i, (unsigned long *)&data->clk_mask,
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SUNXI_USB_MAX_SIZE) {
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of_property_read_string_index(node, "clock-output-names",
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j, &clk_name);
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clk_data->clks[i] = clk_register_gate(NULL, clk_name,
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clk_parent, 0,
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reg, i, 0, lock);
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WARN_ON(IS_ERR(clk_data->clks[i]));
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j++;
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}
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/* Adjust to the real max */
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clk_data->clk_num = i;
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of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
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/* Register a reset controller for usb with reset bits */
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if (data->reset_mask == 0)
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return;
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reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
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if (!reset_data)
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return;
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if (data->reset_needs_clk) {
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reset_data->clk = of_clk_get(node, 0);
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if (IS_ERR(reset_data->clk)) {
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pr_err("Could not get clock for reset controls\n");
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kfree(reset_data);
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return;
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}
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}
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reset_data->reg = reg;
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reset_data->lock = lock;
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reset_data->rcdev.nr_resets = __fls(data->reset_mask) + 1;
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reset_data->rcdev.ops = &sunxi_usb_reset_ops;
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reset_data->rcdev.of_node = node;
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reset_controller_register(&reset_data->rcdev);
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}
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static const struct usb_clk_data sun4i_a10_usb_clk_data __initconst = {
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.clk_mask = BIT(8) | BIT(7) | BIT(6),
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.reset_mask = BIT(2) | BIT(1) | BIT(0),
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};
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static DEFINE_SPINLOCK(sun4i_a10_usb_lock);
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static void __init sun4i_a10_usb_setup(struct device_node *node)
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{
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sunxi_usb_clk_setup(node, &sun4i_a10_usb_clk_data, &sun4i_a10_usb_lock);
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}
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CLK_OF_DECLARE(sun4i_a10_usb, "allwinner,sun4i-a10-usb-clk", sun4i_a10_usb_setup);
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static const struct usb_clk_data sun5i_a13_usb_clk_data __initconst = {
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.clk_mask = BIT(8) | BIT(6),
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.reset_mask = BIT(1) | BIT(0),
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};
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static void __init sun5i_a13_usb_setup(struct device_node *node)
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{
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sunxi_usb_clk_setup(node, &sun5i_a13_usb_clk_data, &sun4i_a10_usb_lock);
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}
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CLK_OF_DECLARE(sun5i_a13_usb, "allwinner,sun5i-a13-usb-clk", sun5i_a13_usb_setup);
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static const struct usb_clk_data sun6i_a31_usb_clk_data __initconst = {
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.clk_mask = BIT(18) | BIT(17) | BIT(16) | BIT(10) | BIT(9) | BIT(8),
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.reset_mask = BIT(2) | BIT(1) | BIT(0),
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};
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static void __init sun6i_a31_usb_setup(struct device_node *node)
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{
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sunxi_usb_clk_setup(node, &sun6i_a31_usb_clk_data, &sun4i_a10_usb_lock);
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}
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CLK_OF_DECLARE(sun6i_a31_usb, "allwinner,sun6i-a31-usb-clk", sun6i_a31_usb_setup);
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static const struct usb_clk_data sun8i_a23_usb_clk_data __initconst = {
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.clk_mask = BIT(16) | BIT(11) | BIT(10) | BIT(9) | BIT(8),
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.reset_mask = BIT(2) | BIT(1) | BIT(0),
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};
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static void __init sun8i_a23_usb_setup(struct device_node *node)
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{
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sunxi_usb_clk_setup(node, &sun8i_a23_usb_clk_data, &sun4i_a10_usb_lock);
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}
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CLK_OF_DECLARE(sun8i_a23_usb, "allwinner,sun8i-a23-usb-clk", sun8i_a23_usb_setup);
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static const struct usb_clk_data sun8i_h3_usb_clk_data __initconst = {
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.clk_mask = BIT(19) | BIT(18) | BIT(17) | BIT(16) |
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BIT(11) | BIT(10) | BIT(9) | BIT(8),
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.reset_mask = BIT(3) | BIT(2) | BIT(1) | BIT(0),
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};
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static void __init sun8i_h3_usb_setup(struct device_node *node)
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{
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sunxi_usb_clk_setup(node, &sun8i_h3_usb_clk_data, &sun4i_a10_usb_lock);
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}
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CLK_OF_DECLARE(sun8i_h3_usb, "allwinner,sun8i-h3-usb-clk", sun8i_h3_usb_setup);
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static const struct usb_clk_data sun9i_a80_usb_mod_data __initconst = {
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.clk_mask = BIT(6) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
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.reset_mask = BIT(19) | BIT(18) | BIT(17),
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.reset_needs_clk = 1,
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};
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static DEFINE_SPINLOCK(a80_usb_mod_lock);
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static void __init sun9i_a80_usb_mod_setup(struct device_node *node)
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{
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sunxi_usb_clk_setup(node, &sun9i_a80_usb_mod_data, &a80_usb_mod_lock);
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}
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CLK_OF_DECLARE(sun9i_a80_usb_mod, "allwinner,sun9i-a80-usb-mod-clk", sun9i_a80_usb_mod_setup);
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static const struct usb_clk_data sun9i_a80_usb_phy_data __initconst = {
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.clk_mask = BIT(10) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
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.reset_mask = BIT(21) | BIT(20) | BIT(19) | BIT(18) | BIT(17),
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.reset_needs_clk = 1,
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};
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static DEFINE_SPINLOCK(a80_usb_phy_lock);
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static void __init sun9i_a80_usb_phy_setup(struct device_node *node)
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{
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sunxi_usb_clk_setup(node, &sun9i_a80_usb_phy_data, &a80_usb_phy_lock);
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}
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CLK_OF_DECLARE(sun9i_a80_usb_phy, "allwinner,sun9i-a80-usb-phy-clk", sun9i_a80_usb_phy_setup);
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