// SPDX-License-Identifier: GPL-2.0-only
/*
 * OMAP interface clock support
 *
 * Copyright (C) 2013 Texas Instruments, Inc.
 *
 * Tero Kristo <t-kristo@ti.com>
 */

#include <linux/clk-provider.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/clk/ti.h>
#include "clock.h"

#undef pr_fmt
#define pr_fmt(fmt) "%s: " fmt, __func__

static const struct clk_ops ti_interface_clk_ops = {
        .init           = &omap2_init_clk_clkdm,
        .enable         = &omap2_dflt_clk_enable,
        .disable        = &omap2_dflt_clk_disable,
        .is_enabled     = &omap2_dflt_clk_is_enabled,
};

static struct clk *_register_interface(struct device_node *node,
                                       const char *name,
                                       const char *parent_name,
                                       struct clk_omap_reg *reg, u8 bit_idx,
                                       const struct clk_hw_omap_ops *ops)
{
        struct clk_init_data init = { NULL };
        struct clk_hw_omap *clk_hw;
        struct clk *clk;

        clk_hw = kzalloc_obj(*clk_hw);
        if (!clk_hw)
                return ERR_PTR(-ENOMEM);

        clk_hw->hw.init = &init;
        clk_hw->ops = ops;
        memcpy(&clk_hw->enable_reg, reg, sizeof(*reg));
        clk_hw->enable_bit = bit_idx;

        init.name = name;
        init.ops = &ti_interface_clk_ops;
        init.flags = 0;

        init.num_parents = 1;
        init.parent_names = &parent_name;

        clk = of_ti_clk_register_omap_hw(node, &clk_hw->hw, name);

        if (IS_ERR(clk))
                kfree(clk_hw);

        return clk;
}

static void __init _of_ti_interface_clk_setup(struct device_node *node,
                                              const struct clk_hw_omap_ops *ops)
{
        struct clk *clk;
        const char *parent_name;
        struct clk_omap_reg reg;
        u8 enable_bit = 0;
        const char *name;

        if (ti_clk_get_reg_addr(node, 0, &reg))
                return;

        enable_bit = reg.bit;

        parent_name = of_clk_get_parent_name(node, 0);
        if (!parent_name) {
                pr_err("%pOFn must have a parent\n", node);
                return;
        }

        name = ti_dt_clk_name(node);
        clk = _register_interface(node, name, parent_name, &reg,
                                  enable_bit, ops);

        if (!IS_ERR(clk))
                of_clk_add_provider(node, of_clk_src_simple_get, clk);
}

static void __init of_ti_interface_clk_setup(struct device_node *node)
{
        _of_ti_interface_clk_setup(node, &clkhwops_iclk_wait);
}
CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock",
               of_ti_interface_clk_setup);

static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node)
{
        _of_ti_interface_clk_setup(node, &clkhwops_iclk);
}
CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock",
               of_ti_no_wait_interface_clk_setup);

#ifdef CONFIG_ARCH_OMAP3
static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node)
{
        _of_ti_interface_clk_setup(node,
                                   &clkhwops_omap3430es2_iclk_hsotgusb_wait);
}
CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock",
               of_ti_hsotgusb_interface_clk_setup);

static void __init of_ti_dss_interface_clk_setup(struct device_node *node)
{
        _of_ti_interface_clk_setup(node,
                                   &clkhwops_omap3430es2_iclk_dss_usbhost_wait);
}
CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock",
               of_ti_dss_interface_clk_setup);

static void __init of_ti_ssi_interface_clk_setup(struct device_node *node)
{
        _of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait);
}
CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock",
               of_ti_ssi_interface_clk_setup);

static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node)
{
        _of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait);
}
CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock",
               of_ti_am35xx_interface_clk_setup);
#endif

#ifdef CONFIG_SOC_OMAP2430
static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node)
{
        _of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait);
}
CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock",
               of_ti_omap2430_interface_clk_setup);
#endif