From patchwork Thu Aug 3 12:03:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Neil Armstrong X-Patchwork-Id: 13339929 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0BD29C04FDF for ; Thu, 3 Aug 2023 12:04:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235739AbjHCMEN (ORCPT ); Thu, 3 Aug 2023 08:04:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54512 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235132AbjHCMEM (ORCPT ); Thu, 3 Aug 2023 08:04:12 -0400 Received: from mail-wm1-x331.google.com (mail-wm1-x331.google.com [IPv6:2a00:1450:4864:20::331]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F0DB32726 for ; Thu, 3 Aug 2023 05:04:09 -0700 (PDT) Received: by mail-wm1-x331.google.com with SMTP id 5b1f17b1804b1-3fe110de46dso8897975e9.1 for ; Thu, 03 Aug 2023 05:04:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1691064248; x=1691669048; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=agCUhn/8LSgqkRC+TGbYPlU94ThrQwri2McEeBSjgT0=; b=NeORpJsLziOeCO1BdsWktBjvU36UtFWoqUJ3KsnKxxQNwVUcvshE7/4BeU7FzlgoSG v65Nb0J3cvRjmNEDuWsUiqbr9Lo7BnrF9lwnpXYfsBJtpTsAnQ0I4cO7RA0NGHUXyuJK YrDRcY7dt8CkYSrikpQ+l5PxImhX+Vqu0oR6ePQd6y8qYtsqO1zcZ9s3UGkn/x+dDVEy mZvFdRJrYzk5urLQdpE0RY30Ihk48bbOW1Q6W6T7xfkNULig8Fx4wUwk0uM7B1H9vkZP 2i2KdSdVTyRxBYa0moU3JNeTTSrxxd7j/mMIceREFFfaNzxavQ4t2er+fbccMrvOYOAO Mj2Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691064248; x=1691669048; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=agCUhn/8LSgqkRC+TGbYPlU94ThrQwri2McEeBSjgT0=; b=RI4E7Byy8fIzjaNmJTYkWCoL7J5Vav8PYGOjaXVnQL9dSMfmd2aDZz8T7nfV2jrPiU 7zvH7Yv5ePUymVVfh330NmaJnH5YowuUHpvSpl69lwley6VD+1R0nON++kiRjxRSRd75 5dymGvE/jR0PTAyJsn3yow7CWqmseeqfxT3zRmel6oHU/RJFDwt4Lr/QFfO82rv4gt73 IZiywdhChoyHcoMrq5SdMAlLGknBaX5MI25GBh+9ks4nV2HGEFlWORghSz50s2PtBL9L E+YOhjDqbgaxx4kCtK542upvQBRFv5gxnuVcwAm1PQDLDOXayjNYXdumeBAGHHXmTqmp IdnA== X-Gm-Message-State: ABy/qLbQ9yXk8iMb+LUqGAlH4m/w4W1DmDEuKoF/l+hN7dbn1y5cO6jd /LZJ0JCqsZ3skCfw00LcTosQlQ== X-Google-Smtp-Source: APBJJlGrd4/x48ci8+s8FZHyJJ9hNY9yGdowrfOU/DikNzuW5wMt3TwsnezHzRKsLorjeI6dCKTryg== X-Received: by 2002:adf:ef42:0:b0:317:5b5f:2328 with SMTP id c2-20020adfef42000000b003175b5f2328mr7059886wrp.24.1691064248055; Thu, 03 Aug 2023 05:04:08 -0700 (PDT) Received: from arrakeen.starnux.net ([2a01:e0a:982:cbb0:52eb:f6ff:feb3:451a]) by smtp.gmail.com with ESMTPSA id d10-20020a056000114a00b00317046f21f9sm21487465wrx.114.2023.08.03.05.04.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Aug 2023 05:04:07 -0700 (PDT) From: Neil Armstrong Date: Thu, 03 Aug 2023 14:03:57 +0200 Subject: [PATCH v7 3/9] clk: meson: add vclk driver MIME-Version: 1.0 Message-Id: <20230803-amlogic-v6-4-upstream-dsi-ccf-vim3-v7-3-762219fc5b28@linaro.org> References: <20230803-amlogic-v6-4-upstream-dsi-ccf-vim3-v7-0-762219fc5b28@linaro.org> In-Reply-To: <20230803-amlogic-v6-4-upstream-dsi-ccf-vim3-v7-0-762219fc5b28@linaro.org> To: Jerome Brunet , Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Kevin Hilman , Martin Blumenstingl , David Airlie , Daniel Vetter , Jagan Teki , Nicolas Belin Cc: linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org, Neil Armstrong X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=9036; i=neil.armstrong@linaro.org; h=from:subject:message-id; bh=QRCNRMlZZPU+/GYJx9LR/JWNNbQG1u0cT+Nsy+8OVWo=; b=owEBbQKS/ZANAwAKAXfc29rIyEnRAcsmYgBky5ew/TNqFil/5IVGUZ5//ATYuIpNCvOsmw7yr9va ICLqYfSJAjMEAAEKAB0WIQQ9U8YmyFYF/h30LIt33NvayMhJ0QUCZMuXsAAKCRB33NvayMhJ0cIeD/ 4nNrr8EzbM8rKH9R9ev8qR3ccpdOthSLAol0rqB1wkxAbegfpWAOPG/Dkf7kWnP6ZU9dnSu2xGcxwZ PEYG/5C31rzh5IMSp5mGitty60xv/FuaeCURDv09I+QAli3rji9adHUdn7aV/tTrfFpzUp4ZtixO/O dMq64rjJ/99lFMFjz+F3QZX0Ca9MIE4EvKdzr7B5/bw5n0OkRNF8XQb8CsQ40/71Nl67Ps8gFiOyzg 1V4JIXMrvvTuXKQperENdnz1cJ20pXlz4tR6BD/Vqkd1fNoRSKAct5531a1eCVoi5lrY/RhWif4zC9 1olGZz165kYJg6Y4oRq8k31EfejNBW8extOLZfblVze83mse1T8cxAUCffTJv0IZsZizF9H+21VUk0 Wu70Fb4JGy2lMiOc7sH4d6zW1nOf5PZ4isUF2WzCQWHNeWrtPoJ3JvWZ3dPywn/Tr8mhszRP6nuyqV hGeiuVJ/OOFESZmMxs49phiplf0wvayIhcdzSMaAwgqEZTy+LzTupq/4dm5rDc55AV24ttrNt3c/1a ybACIpiq3Ru08sidVzz/BXIBdHsZ+/x9gBb06UierpaRfjHlLBfXct4fZhCQXMA7tMbgfVufumtfY0 maYF2AdAuP2x6i+bnH5ghbsT+8sFPkVAs4DSQpUCipFGTw07b4O7nQeq7x7g== X-Developer-Key: i=neil.armstrong@linaro.org; a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org The VCLK and VCLK_DIV clocks have supplementary bits. The VCLK has a "SOFT RESET" bit to toggle after the whole VCLK sub-tree rate has been set, this is implemented in the gate enable callback. The VCLK_DIV clocks as enable and reset bits used to disable and reset the divider, associated with CLK_SET_RATE_GATE it ensures the rate is set while the divider is disabled and in reset mode. The VCLK_DIV enable bit isn't implemented as a gate since it's part of the divider logic and vendor does this exact sequence to ensure the divider is correctly set. Signed-off-by: Neil Armstrong --- drivers/clk/meson/Kconfig | 5 ++ drivers/clk/meson/Makefile | 1 + drivers/clk/meson/vclk.c | 146 +++++++++++++++++++++++++++++++++++++++++++++ drivers/clk/meson/vclk.h | 68 +++++++++++++++++++++ 4 files changed, 220 insertions(+) diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig index 135da8f2d0b1..83f629515e96 100644 --- a/drivers/clk/meson/Kconfig +++ b/drivers/clk/meson/Kconfig @@ -30,6 +30,10 @@ config COMMON_CLK_MESON_VID_PLL_DIV tristate select COMMON_CLK_MESON_REGMAP +config COMMON_CLK_MESON_VCLK + tristate + select COMMON_CLK_MESON_REGMAP + config COMMON_CLK_MESON_CLKC_UTILS tristate @@ -140,6 +144,7 @@ config COMMON_CLK_G12A select COMMON_CLK_MESON_EE_CLKC select COMMON_CLK_MESON_CPU_DYNDIV select COMMON_CLK_MESON_VID_PLL_DIV + select COMMON_CLK_MESON_VCLK select MFD_SYSCON help Support for the clock controller on Amlogic S905D2, S905X2 and S905Y2 diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile index cd961cc4f4db..6efeb8c7bd2a 100644 --- a/drivers/clk/meson/Makefile +++ b/drivers/clk/meson/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_COMMON_CLK_MESON_PLL) += clk-pll.o obj-$(CONFIG_COMMON_CLK_MESON_REGMAP) += clk-regmap.o obj-$(CONFIG_COMMON_CLK_MESON_SCLK_DIV) += sclk-div.o obj-$(CONFIG_COMMON_CLK_MESON_VID_PLL_DIV) += vid-pll-div.o +obj-$(CONFIG_COMMON_CLK_MESON_VCLK) += vclk.o # Amlogic Clock controllers diff --git a/drivers/clk/meson/vclk.c b/drivers/clk/meson/vclk.c new file mode 100644 index 000000000000..0df84403b17f --- /dev/null +++ b/drivers/clk/meson/vclk.c @@ -0,0 +1,146 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2023 Neil Armstrong + */ + +#include +#include "vclk.h" + +/* The VCLK gate has a supplementary reset bit to pulse after ungating */ + +static int clk_regmap_vclk_enable(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct clk_regmap_vclk_data *vclk = clk_get_regmap_vclk_data(clk); + + regmap_set_bits(clk->map, vclk->offset, BIT(vclk->enable_bit_idx)); + + /* Do a reset pulse */ + regmap_set_bits(clk->map, vclk->offset, BIT(vclk->reset_bit_idx)); + regmap_clear_bits(clk->map, vclk->offset, BIT(vclk->reset_bit_idx)); + + return 0; +} + +static void clk_regmap_vclk_disable(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct clk_regmap_vclk_data *vclk = clk_get_regmap_vclk_data(clk); + + regmap_clear_bits(clk->map, vclk->offset, BIT(vclk->enable_bit_idx)); +} + +static int clk_regmap_vclk_is_enabled(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct clk_regmap_vclk_data *vclk = clk_get_regmap_vclk_data(clk); + unsigned int val; + + regmap_read(clk->map, vclk->offset, &val); + + return val & BIT(vclk->enable_bit_idx) ? 1 : 0; +} + +const struct clk_ops clk_regmap_vclk_ops = { + .enable = clk_regmap_vclk_enable, + .disable = clk_regmap_vclk_disable, + .is_enabled = clk_regmap_vclk_is_enabled, +}; +EXPORT_SYMBOL_GPL(clk_regmap_vclk_ops); + +/* The VCLK Divider has supplementary reset & enable bits */ + +static unsigned long clk_regmap_vclk_div_recalc_rate(struct clk_hw *hw, + unsigned long prate) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct clk_regmap_vclk_div_data *vclk = clk_get_regmap_vclk_div_data(clk); + unsigned int val; + int ret; + + ret = regmap_read(clk->map, vclk->offset, &val); + if (ret) + /* Gives a hint that something is wrong */ + return 0; + + val >>= vclk->shift; + val &= clk_div_mask(vclk->width); + + return divider_recalc_rate(hw, prate, val, vclk->table, vclk->flags, + vclk->width); +} + +static int clk_regmap_vclk_div_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct clk_regmap_vclk_div_data *vclk = clk_get_regmap_vclk_div_data(clk); + + return divider_determine_rate(hw, req, vclk->table, vclk->width, + vclk->flags); +} + +static int clk_regmap_vclk_div_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct clk_regmap_vclk_div_data *vclk = clk_get_regmap_vclk_div_data(clk); + unsigned int val; + int ret; + + ret = divider_get_val(rate, parent_rate, vclk->table, vclk->width, + vclk->flags); + if (ret < 0) + return ret; + + val = (unsigned int)ret << vclk->shift; + return regmap_update_bits(clk->map, vclk->offset, + clk_div_mask(vclk->width) << vclk->shift, val); +}; + +static int clk_regmap_vclk_div_enable(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct clk_regmap_vclk_div_data *vclk = clk_get_regmap_vclk_div_data(clk); + + /* Unreset the divider when ungating */ + regmap_clear_bits(clk->map, vclk->offset, BIT(vclk->reset_bit_idx)); + + return regmap_set_bits(clk->map, vclk->offset, BIT(vclk->enable_bit_idx)); +} + +static void clk_regmap_vclk_div_disable(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct clk_regmap_vclk_div_data *vclk = clk_get_regmap_vclk_div_data(clk); + + /* Reset the divider when gating */ + regmap_clear_bits(clk->map, vclk->offset, BIT(vclk->enable_bit_idx)); + + regmap_set_bits(clk->map, vclk->offset, BIT(vclk->reset_bit_idx)); +} + +static int clk_regmap_vclk_div_is_enabled(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct clk_regmap_vclk_div_data *vclk = clk_get_regmap_vclk_div_data(clk); + unsigned int val; + + regmap_read(clk->map, vclk->offset, &val); + + return val & BIT(vclk->enable_bit_idx) ? 1 : 0; +} + +const struct clk_ops clk_regmap_vclk_div_ops = { + .recalc_rate = clk_regmap_vclk_div_recalc_rate, + .determine_rate = clk_regmap_vclk_div_determine_rate, + .set_rate = clk_regmap_vclk_div_set_rate, + .enable = clk_regmap_vclk_div_enable, + .disable = clk_regmap_vclk_div_disable, + .is_enabled = clk_regmap_vclk_div_is_enabled, +}; +EXPORT_SYMBOL_GPL(clk_regmap_vclk_div_ops); + +MODULE_DESCRIPTION("Amlogic vclk clock driver"); +MODULE_AUTHOR("Neil Armstrong "); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/clk/meson/vclk.h b/drivers/clk/meson/vclk.h new file mode 100644 index 000000000000..90786552a7f3 --- /dev/null +++ b/drivers/clk/meson/vclk.h @@ -0,0 +1,68 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 Neil Armstrong + */ + +#ifndef __VCLK_H +#define __VCLK_H + +#include "clk-regmap.h" + +/** + * struct clk_regmap_vclk_data - vclk regmap backed specific data + * + * @offset: offset of the register controlling gate + * @enable_bit_idx: single bit controlling vclk enable + * @reset_bit_idx: single bit controlling vclk reset + * @flags: hardware-specific flags + * + * Flags: + * Same as clk_gate except CLK_GATE_HIWORD_MASK which is ignored + */ +struct clk_regmap_vclk_data { + unsigned int offset; + u8 enable_bit_idx; + u8 reset_bit_idx; + u8 flags; +}; + +static inline struct clk_regmap_vclk_data * +clk_get_regmap_vclk_data(struct clk_regmap *clk) +{ + return (struct clk_regmap_vclk_data *)clk->data; +} + +extern const struct clk_ops clk_regmap_vclk_ops; + +/** + * struct clk_regmap_vclk_div_data - vclk_div regmap back specific data + * + * @offset: offset of the register controlling the divider + * @shift: shift to the divider bit field + * @width: width of the divider bit field + * @enable_bit_idx: single bit controlling vclk divider enable + * @reset_bit_idx: single bit controlling vclk divider reset + * @table: array of value/divider pairs, last entry should have div = 0 + * + * Flags: + * Same as clk_divider except CLK_DIVIDER_HIWORD_MASK which is ignored + */ +struct clk_regmap_vclk_div_data { + unsigned int offset; + u8 shift; + u8 width; + u8 enable_bit_idx; + u8 reset_bit_idx; + const struct clk_div_table *table; + u8 flags; +}; + +static inline struct clk_regmap_vclk_div_data * +clk_get_regmap_vclk_div_data(struct clk_regmap *clk) +{ + return (struct clk_regmap_vclk_div_data *)clk->data; +} + +extern const struct clk_ops clk_regmap_vclk_div_ops; + +#endif /* __VCLK_H */