152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
/*
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* Copyright (c) 2016 Rockchip Electronics Co. Ltd.
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* Author: Lin Huang <hl@rock-chips.com>
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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/arm-smccc.h>
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <soc/rockchip/rockchip_sip.h>
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#include "clk.h"
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struct rockchip_ddrclk {
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struct clk_hw hw;
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void __iomem *reg_base;
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int mux_offset;
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int mux_shift;
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int mux_width;
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int div_shift;
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int div_width;
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int ddr_flag;
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spinlock_t *lock;
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};
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#define to_rockchip_ddrclk_hw(hw) container_of(hw, struct rockchip_ddrclk, hw)
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static int rockchip_ddrclk_sip_set_rate(struct clk_hw *hw, unsigned long drate,
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unsigned long prate)
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{
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struct rockchip_ddrclk *ddrclk = to_rockchip_ddrclk_hw(hw);
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unsigned long flags;
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struct arm_smccc_res res;
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spin_lock_irqsave(ddrclk->lock, flags);
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arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, drate, 0,
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ROCKCHIP_SIP_CONFIG_DRAM_SET_RATE,
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0, 0, 0, 0, &res);
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spin_unlock_irqrestore(ddrclk->lock, flags);
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return res.a0;
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}
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static unsigned long
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rockchip_ddrclk_sip_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
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ROCKCHIP_SIP_CONFIG_DRAM_GET_RATE,
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0, 0, 0, 0, &res);
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return res.a0;
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}
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static long rockchip_ddrclk_sip_round_rate(struct clk_hw *hw,
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unsigned long rate,
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unsigned long *prate)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, rate, 0,
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ROCKCHIP_SIP_CONFIG_DRAM_ROUND_RATE,
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0, 0, 0, 0, &res);
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return res.a0;
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}
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static u8 rockchip_ddrclk_get_parent(struct clk_hw *hw)
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{
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struct rockchip_ddrclk *ddrclk = to_rockchip_ddrclk_hw(hw);
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int num_parents = clk_hw_get_num_parents(hw);
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u32 val;
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val = clk_readl(ddrclk->reg_base +
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ddrclk->mux_offset) >> ddrclk->mux_shift;
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val &= GENMASK(ddrclk->mux_width - 1, 0);
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if (val >= num_parents)
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return -EINVAL;
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return val;
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}
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static const struct clk_ops rockchip_ddrclk_sip_ops = {
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.recalc_rate = rockchip_ddrclk_sip_recalc_rate,
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.set_rate = rockchip_ddrclk_sip_set_rate,
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.round_rate = rockchip_ddrclk_sip_round_rate,
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.get_parent = rockchip_ddrclk_get_parent,
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};
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struct clk *rockchip_clk_register_ddrclk(const char *name, int flags,
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const char *const *parent_names,
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u8 num_parents, int mux_offset,
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int mux_shift, int mux_width,
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int div_shift, int div_width,
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int ddr_flag, void __iomem *reg_base,
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spinlock_t *lock)
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{
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struct rockchip_ddrclk *ddrclk;
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struct clk_init_data init;
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struct clk *clk;
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ddrclk = kzalloc(sizeof(*ddrclk), GFP_KERNEL);
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if (!ddrclk)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.parent_names = parent_names;
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init.num_parents = num_parents;
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init.flags = flags;
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init.flags |= CLK_SET_RATE_NO_REPARENT;
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switch (ddr_flag) {
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case ROCKCHIP_DDRCLK_SIP:
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init.ops = &rockchip_ddrclk_sip_ops;
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break;
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default:
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pr_err("%s: unsupported ddrclk type %d\n", __func__, ddr_flag);
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kfree(ddrclk);
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return ERR_PTR(-EINVAL);
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}
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ddrclk->reg_base = reg_base;
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ddrclk->lock = lock;
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ddrclk->hw.init = &init;
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ddrclk->mux_offset = mux_offset;
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ddrclk->mux_shift = mux_shift;
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ddrclk->mux_width = mux_width;
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ddrclk->div_shift = div_shift;
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ddrclk->div_width = div_width;
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ddrclk->ddr_flag = ddr_flag;
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clk = clk_register(NULL, &ddrclk->hw);
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if (IS_ERR(clk))
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kfree(ddrclk);
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return clk;
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}
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