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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-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 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;
spin_lock_irqsave(data->lock, flags);
reg = readl(data->reg);
writel(reg & ~BIT(id), data->reg);
spin_unlock_irqrestore(data->lock, flags);
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;
spin_lock_irqsave(data->lock, flags);
reg = readl(data->reg);
writel(reg | BIT(id), data->reg);
spin_unlock_irqrestore(data->lock, flags);
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;
};
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;
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);
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