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Message-ID: <67c0c728-389c-668f-4966-39e9966e1b42@rock-chips.com>
Date: Fri, 3 Jun 2016 20:29:43 +0800
From: Shawn Lin <shawn.lin@...k-chips.com>
To: Lin Huang <hl@...k-chips.com>, heiko@...ech.de,
mark.yao@...k-chips.com, myungjoo.ham@...sung.com
Cc: shawn.lin@...k-chips.com, huangtao@...k-chips.com,
typ@...k-chips.com, airlied@...ux.ie, mturquette@...libre.com,
dbasehore@...omium.org, sboyd@...eaurora.org,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
dianders@...omium.org, linux-rockchip@...ts.infradead.org,
kyungmin.park@...sung.com, linux-clk@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH v1 1/6] rockchip: rockchip: add new clock-type for the
ddrclk
Hi Lin,
It looks good with only a few minor comments.
On 2016/6/3 17:55, Lin Huang wrote:
> On new rockchip platform(rk3399 etc), there have dcf controller to
> do ddr frequency scaling, and this controller will implement in
> arm-trust-firmware. We add a special clock-type to handle that.
>
> Signed-off-by: Lin Huang <hl@...k-chips.com>
> ---
> Changes in v1:
> - None
>
> drivers/clk/rockchip/Makefile | 1 +
> drivers/clk/rockchip/clk-ddr.c | 147 +++++++++++++++++++++++++++++++++++++++++
> drivers/clk/rockchip/clk.c | 9 +++
> drivers/clk/rockchip/clk.h | 27 ++++++++
> 4 files changed, 184 insertions(+)
> create mode 100644 drivers/clk/rockchip/clk-ddr.c
>
> diff --git a/drivers/clk/rockchip/Makefile b/drivers/clk/rockchip/Makefile
> index f47a2fa..b5f2c8e 100644
> --- a/drivers/clk/rockchip/Makefile
> +++ b/drivers/clk/rockchip/Makefile
> @@ -8,6 +8,7 @@ obj-y += clk-pll.o
> obj-y += clk-cpu.o
> obj-y += clk-inverter.o
> obj-y += clk-mmc-phase.o
> +obj-y += clk-ddr.o
> obj-$(CONFIG_RESET_CONTROLLER) += softrst.o
>
> obj-y += clk-rk3036.o
> diff --git a/drivers/clk/rockchip/clk-ddr.c b/drivers/clk/rockchip/clk-ddr.c
> new file mode 100644
> index 0000000..5b6630d
> --- /dev/null
> +++ b/drivers/clk/rockchip/clk-ddr.c
> @@ -0,0 +1,147 @@
> +/*
> + * Copyright (c) 2016 Rockchip Electronics Co. Ltd.
> + * Author: Lin Huang <hl@...k-chips.com>
> + *
> + * 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/of.h>
> +#include <linux/slab.h>
> +#include <linux/io.h>
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include "clk.h"
> +
alphabetical order would be better.
> +struct rockchip_ddrclk {
> + struct clk_hw hw;
> + void __iomem *reg_base;
> + int mux_offset;
> + int mux_shift;
> + int mux_width;
> + int mux_flag;
> + int div_shift;
> + int div_width;
> + int div_flag;
> + spinlock_t *lock;
> +};
> +
> +#define to_rockchip_ddrclk_hw(hw) container_of(hw, struct rockchip_ddrclk, hw)
> +#define val_mask(width) ((1 << (width)) - 1)
> +
> +static int rockchip_ddrclk_set_rate(struct clk_hw *hw, unsigned long drate,
> + unsigned long prate)
> +{
> + struct rockchip_ddrclk *ddrclk = to_rockchip_ddrclk_hw(hw);
> + unsigned long flags;
> +
> + spin_lock_irqsave(ddrclk->lock, flags);
> +
> + /* TODO: set ddr rate in bl31 */
> +
> + spin_unlock_irqrestore(ddrclk->lock, flags);
> +
What do you wanna protect here?
> + return 0;
> +}
> +
> +static unsigned long
> +rockchip_ddrclk_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + struct rockchip_ddrclk *ddrclk = to_rockchip_ddrclk_hw(hw);
> + int val;
> +
> + val = clk_readl(ddrclk->reg_base +
> + ddrclk->mux_offset) >> ddrclk->div_shift;
> + val &= val_mask(ddrclk->div_width);
> +
> + return DIV_ROUND_UP_ULL((u64)parent_rate, val + 1);
> +}
> +
> +static long clk_ddrclk_round_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long *prate)
> +{
> + return rate;
> +}
> +
> +static u8 rockchip_ddrclk_get_parent(struct clk_hw *hw)
> +{
> + struct rockchip_ddrclk *ddrclk = to_rockchip_ddrclk_hw(hw);
> + int num_parents = clk_hw_get_num_parents(hw);
> + u32 val;
> +
> + val = clk_readl(ddrclk->reg_base +
> + ddrclk->mux_offset) >> ddrclk->mux_shift;
> + val &= val_mask(ddrclk->mux_width);
> +
> + if (val >= num_parents)
> + return -EINVAL;
> +
> + return val;
> +}
> +
> +static const struct clk_ops rockchip_ddrclk_ops = {
> + .recalc_rate = rockchip_ddrclk_recalc_rate,
> + .set_rate = rockchip_ddrclk_set_rate,
> + .round_rate = clk_ddrclk_round_rate,
> + .get_parent = rockchip_ddrclk_get_parent,
> +};
> +
> +struct clk *rockchip_clk_register_ddrclk(const char *name, int flags,
> + const char *const *parent_names,
> + u8 num_parents, int mux_offset,
> + int mux_shift, int mux_width,
> + int mux_flag, int div_shift,
> + int div_width, int div_flag,
> + void __iomem *reg_base,
> + spinlock_t *lock)
> +{
> + struct rockchip_ddrclk *ddrclk;
> + struct clk_init_data init;
> + struct clk *clk;
> + int ret;
> +
> + ddrclk = kzalloc(sizeof(*ddrclk), GFP_KERNEL);
> + if (!ddrclk)
> + return ERR_PTR(-ENOMEM);
> +
> + init.name = name;
> + init.parent_names = parent_names;
> + init.num_parents = num_parents;
> + init.ops = &rockchip_ddrclk_ops;
> +
> + init.flags = flags;
> + init.flags |= CLK_SET_RATE_NO_REPARENT;
> + init.flags |= CLK_GET_RATE_NOCACHE;
can we combine these two?
> +
> + ddrclk->reg_base = reg_base;
> + ddrclk->lock = lock;
> + ddrclk->hw.init = &init;
> + ddrclk->mux_offset = mux_offset;
> + ddrclk->mux_shift = mux_shift;
> + ddrclk->mux_width = mux_width;
> + ddrclk->mux_flag = mux_flag;
> + ddrclk->div_shift = div_shift;
> + ddrclk->div_width = div_width;
> + ddrclk->div_flag = div_flag;
> +
> + clk = clk_register(NULL, &ddrclk->hw);
> + if (IS_ERR(clk)) {
> + pr_err("%s: could not register ddrclk %s\n", __func__, name);
> + ret = PTR_ERR(clk);
Why do you need PTR_ERR and then convert back again.
> + goto free_ddrclk;
> + }
> +
> + return clk;
> +
> +free_ddrclk:
> + kfree(ddrclk);
> + return ERR_PTR(ret);
> +}
> diff --git a/drivers/clk/rockchip/clk.c b/drivers/clk/rockchip/clk.c
> index 7ffd134..6ac1aa5 100644
> --- a/drivers/clk/rockchip/clk.c
> +++ b/drivers/clk/rockchip/clk.c
> @@ -484,6 +484,15 @@ void __init rockchip_clk_register_branches(
> list->gate_offset, list->gate_shift,
> list->gate_flags, flags, &ctx->lock);
> break;
> + case branch_ddrc:
> + clk = rockchip_clk_register_ddrclk(
> + list->name, list->flags,
> + list->parent_names, list->num_parents,
> + list->muxdiv_offset, list->mux_shift,
> + list->mux_width, list->mux_flags,
> + list->div_shift, list->div_width,
> + list->div_flags, ctx->reg_base, &ctx->lock);
> + break;
> }
>
> /* none of the cases above matched */
> diff --git a/drivers/clk/rockchip/clk.h b/drivers/clk/rockchip/clk.h
> index 2194ffa..4033fe4 100644
> --- a/drivers/clk/rockchip/clk.h
> +++ b/drivers/clk/rockchip/clk.h
> @@ -281,6 +281,13 @@ struct clk *rockchip_clk_register_mmc(const char *name,
> const char *const *parent_names, u8 num_parents,
> void __iomem *reg, int shift);
>
> +struct clk *rockchip_clk_register_ddrclk(const char *name, int flags,
> + const char *const *parent_names, u8 num_parents,
> + int mux_offset, int mux_shift, int mux_width,
> + int mux_flag, int div_shift, int div_width,
> + int div_flag, void __iomem *reg_base,
> + spinlock_t *lock);
> +
> #define ROCKCHIP_INVERTER_HIWORD_MASK BIT(0)
>
> struct clk *rockchip_clk_register_inverter(const char *name,
> @@ -299,6 +306,7 @@ enum rockchip_clk_branch_type {
> branch_mmc,
> branch_inverter,
> branch_factor,
> + branch_ddrc,
> };
>
> struct rockchip_clk_branch {
> @@ -488,6 +496,25 @@ struct rockchip_clk_branch {
> .child = ch, \
> }
>
> +#define COMPOSITE_DDRC(_id, cname, pnames, f, mo, ms, mw, mf, \
> + ds, dw, df) \
it seems a duplication exept for branch_type.
> + { \
> + .id = _id, \
> + .branch_type = branch_ddrc, \
> + .name = cname, \
> + .parent_names = pnames, \
> + .num_parents = ARRAY_SIZE(pnames), \
> + .flags = f, \
> + .muxdiv_offset = mo, \
> + .mux_shift = ms, \
> + .mux_width = mw, \
> + .mux_flags = mf, \
> + .div_shift = ds, \
> + .div_width = dw, \
> + .div_flags = df, \
> + .gate_offset = -1, \
> + }
> +
> #define MUX(_id, cname, pnames, f, o, s, w, mf) \
> { \
> .id = _id, \
>
--
Best Regards
Shawn Lin
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