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