--- /dev/null
+/*
+ * 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-provider.h>
+#include <linux/clkdev.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/reset-controller.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 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 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);
Code Review / kvmfornfv.git / blobdiff