From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752309AbcFFCYZ (ORCPT ); Sun, 5 Jun 2016 22:24:25 -0400 Received: from lucky1.263xmail.com ([211.157.147.131]:60883 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752183AbcFFCYX (ORCPT ); Sun, 5 Jun 2016 22:24:23 -0400 X-263anti-spam: KSV:0; X-MAIL-GRAY: 1 X-MAIL-DELIVERY: 0 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-ADDR-CHECKED: 0 X-RL-SENDER: hl@rock-chips.com X-FST-TO: linux-arm-kernel@lists.infradead.org X-SENDER-IP: 103.29.142.67 X-LOGIN-NAME: hl@rock-chips.com X-UNIQUE-TAG: <9fc65c891eea687f964121722ff09106> X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 Subject: Re: [RFC PATCH v1 1/6] rockchip: rockchip: add new clock-type for the ddrclk To: Shawn Lin , heiko@sntech.de, mark.yao@rock-chips.com, myungjoo.ham@samsung.com References: <1464947719-6245-1-git-send-email-hl@rock-chips.com> <1464947719-6245-2-git-send-email-hl@rock-chips.com> <67c0c728-389c-668f-4966-39e9966e1b42@rock-chips.com> Cc: huangtao@rock-chips.com, dbasehore@chromium.org, linux-clk@vger.kernel.org, airlied@linux.ie, typ@rock-chips.com, sboyd@codeaurora.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, dianders@chromium.org, linux-rockchip@lists.infradead.org, kyungmin.park@samsung.com, mturquette@baylibre.com, linux-arm-kernel@lists.infradead.org From: hl Message-ID: <5754DEC9.6030800@rock-chips.com> Date: Mon, 6 Jun 2016 10:24:09 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 In-Reply-To: <67c0c728-389c-668f-4966-39e9966e1b42@rock-chips.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Shawn, On 2016年06月03日 20:29, Shawn Lin wrote: > 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 >> --- >> 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 >> + * >> + * 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 >> +#include >> +#include >> +#include >> +#include >> +#include "clk.h" >> + > > alphabetical order would be better. Okay, will fix next version, thank you. > >> +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? I am not sure for now, when i finish this function, if there nothing need protect i will remove it. Thank you. > >> + 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. Yes, there is only one error for ret value, so i can return "NULL" directly, thank you. > >> + 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. We just need this different branch_type, so we can add case in rockchip_clk_register_branches() and call rockchip_clk_register_ddrclk(). > >> + { \ >> + .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, \ >> > > -- Lin Huang