From patchwork Thu Jun 3 22:17:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar X-Patchwork-Id: 12298279 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E1664C47082 for ; Thu, 3 Jun 2021 22:18:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BACDC613DA for ; Thu, 3 Jun 2021 22:18:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231266AbhFCWU3 (ORCPT ); Thu, 3 Jun 2021 18:20:29 -0400 Received: from relmlor2.renesas.com ([210.160.252.172]:9907 "EHLO relmlie6.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S230265AbhFCWU3 (ORCPT ); Thu, 3 Jun 2021 18:20:29 -0400 X-IronPort-AV: E=Sophos;i="5.83,246,1616425200"; d="scan'208";a="83182167" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 04 Jun 2021 07:18:42 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id CA0B4410B534; Fri, 4 Jun 2021 07:18:38 +0900 (JST) From: Lad Prabhakar To: Geert Uytterhoeven , Magnus Damm , Rob Herring , Michael Turquette , Stephen Boyd , Catalin Marinas , Will Deacon , Greg Kroah-Hartman , Jiri Slaby , Philipp Zabel , linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-serial@vger.kernel.org Cc: Prabhakar , Biju Das , Lad Prabhakar Subject: [PATCH v2 08/12] clk: renesas: Add CPG core wrapper for RZ/G2L SoC Date: Thu, 3 Jun 2021 23:17:54 +0100 Message-Id: <20210603221758.10305-9-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210603221758.10305-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20210603221758.10305-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org Add CPG core wrapper for RZ/G2L family. Based on a patch in the BSP by Binh Nguyen . Signed-off-by: Lad Prabhakar Reviewed-by: Biju Das --- drivers/clk/renesas/Kconfig | 4 + drivers/clk/renesas/Makefile | 1 + drivers/clk/renesas/renesas-rzg2l-cpg.c | 973 ++++++++++++++++++++++++ drivers/clk/renesas/renesas-rzg2l-cpg.h | 215 ++++++ 4 files changed, 1193 insertions(+) create mode 100644 drivers/clk/renesas/renesas-rzg2l-cpg.c create mode 100644 drivers/clk/renesas/renesas-rzg2l-cpg.h diff --git a/drivers/clk/renesas/Kconfig b/drivers/clk/renesas/Kconfig index 607e64a17d72..5a0d934f43a4 100644 --- a/drivers/clk/renesas/Kconfig +++ b/drivers/clk/renesas/Kconfig @@ -182,6 +182,10 @@ config CLK_RCAR_USB2_CLOCK_SEL help This is a driver for R-Car USB2 clock selector +config CLK_RZG2L + bool "Renesas RZ/G2L SoC clock support" if COMPILE_TEST && !ARCH_RENESAS + depends on ARCH_RENESAS || COMPILE_TEST + # Generic config CLK_RENESAS_CPG_MSSR bool "CPG/MSSR clock support" if COMPILE_TEST diff --git a/drivers/clk/renesas/Makefile b/drivers/clk/renesas/Makefile index ef0d2bba92bf..a9c299686b4a 100644 --- a/drivers/clk/renesas/Makefile +++ b/drivers/clk/renesas/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_CLK_RCAR_CPG_LIB) += rcar-cpg-lib.o obj-$(CONFIG_CLK_RCAR_GEN2_CPG) += rcar-gen2-cpg.o obj-$(CONFIG_CLK_RCAR_GEN3_CPG) += rcar-gen3-cpg.o obj-$(CONFIG_CLK_RCAR_USB2_CLOCK_SEL) += rcar-usb2-clock-sel.o +obj-$(CONFIG_CLK_RZG2L) += renesas-rzg2l-cpg.o # Generic obj-$(CONFIG_CLK_RENESAS_CPG_MSSR) += renesas-cpg-mssr.o diff --git a/drivers/clk/renesas/renesas-rzg2l-cpg.c b/drivers/clk/renesas/renesas-rzg2l-cpg.c new file mode 100644 index 000000000000..f096b9d0548c --- /dev/null +++ b/drivers/clk/renesas/renesas-rzg2l-cpg.c @@ -0,0 +1,973 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * RZ/G2L Clock Pulse Generator + * + * Copyright (C) 2021 Renesas Electronics Corp. + * + * Based on renesas-cpg-mssr.c + * + * Copyright (C) 2015 Glider bvba + * Copyright (C) 2013 Ideas On Board SPRL + * Copyright (C) 2015 Renesas Electronics Corp. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "renesas-rzg2l-cpg.h" + +#ifdef DEBUG +#define WARN_DEBUG(x) WARN_ON(x) +#else +#define WARN_DEBUG(x) do { } while (0) +#endif + +#define DIV_RSMASK(v, s, m) ((v >> s) & m) +#define GET_REG(val) ((val >> 20) & 0xfff) +#define GET_SHIFT(val) ((val >> 12) & 0xff) +#define GET_WIDTH(val) ((val >> 8) & 0xf) + +#define KDIV(val) DIV_RSMASK(val, 16, 0xffff) +#define MDIV(val) DIV_RSMASK(val, 6, 0x3ff) +#define PDIV(val) DIV_RSMASK(val, 0, 0x3f) +#define SDIV(val) DIV_RSMASK(val, 0, 0x7) +#define REFDIV(val) DIV_RSMASK(val, 8, 0x3f) +#define POSTDIV1(val) DIV_RSMASK(val, 0, 0x7) +#define POSTDIV2(val) DIV_RSMASK(val, 4, 0x7) +#define FRACIN(val) DIV_RSMASK(val, 8, 0xffffff) +#define INITIN(val) DIV_RSMASK(val, 16, 0xfff) + +#define CLK_ON_R(reg) (reg) +#define CLK_MON_R(reg) (0x680 - 0x500 + (reg)) +#define CLK_RST_R(reg) (0x800 - 0x500 + (reg)) +#define CLK_MRST_R(reg) (0x980 - 0x500 + (reg)) + +#define GET_REG1(val) ((val >> 22) & 0x3ff) +#define GET_REG2(val) ((val >> 12) & 0x3ff) +#define GET_REG3(val) (val & 0x3ff) + +/** + * struct rzg2l_cpg_priv - Clock Pulse Generator Private Data + * + * @rcdev: Optional reset controller entity + * @dev: CPG device + * @base: CPG register block base address + * @rmw_lock: protects RMW register accesses + * @clks: Array containing all Core and Module Clocks + * @num_core_clks: Number of Core Clocks in clks[] + * @num_mod_clks: Number of Module Clocks in clks[] + * @last_dt_core_clk: ID of the last Core Clock exported to DT + * @notifiers: Notifier chain to save/restore clock state for system resume + * @info: Pointer to platform data + */ +struct rzg2l_cpg_priv { +#ifdef CONFIG_RESET_CONTROLLER + struct reset_controller_dev rcdev; +#endif + struct device *dev; + void __iomem *base; + spinlock_t rmw_lock; + + struct clk **clks; + unsigned int num_core_clks; + unsigned int num_mod_clks; + unsigned int last_dt_core_clk; + + struct raw_notifier_head notifiers; + const struct rzg2l_cpg_info *info; +}; + +static void rzg2l_cpg_del_clk_provider(void *data) +{ + of_clk_del_provider(data); +} + +static struct clk * __init +rzg2l_cpg_div_clk_register(const struct cpg_core_clk *core, + struct clk **clks, + void __iomem *base, + struct rzg2l_cpg_priv *priv) +{ + struct device *dev = priv->dev; + const struct clk *parent; + const char *parent_name; + struct clk_hw *clk_hw; + + parent = clks[core->parent & 0xffff]; + if (IS_ERR(parent)) + return ERR_CAST(parent); + + parent_name = __clk_get_name(parent); + + if (core->dtable) + clk_hw = clk_hw_register_divider_table(dev, core->name, + parent_name, 0, + base + GET_REG(core->conf), + GET_SHIFT(core->conf), + GET_WIDTH(core->conf), + core->flag, + core->dtable, + &priv->rmw_lock); + else + clk_hw = clk_hw_register_divider(dev, core->name, + parent_name, 0, + base + GET_REG(core->conf), + GET_SHIFT(core->conf), + GET_WIDTH(core->conf), + core->flag, &priv->rmw_lock); + + if (IS_ERR(clk_hw)) + return NULL; + + return clk_hw->clk; +} + +static struct clk * __init +rzg2l_cpg_sell_clk_register(const struct cpg_core_clk *core, + void __iomem *base, struct rzg2l_cpg_priv *priv) +{ + const struct clk_hw *clk_hw; + + clk_hw = clk_hw_register_mux(priv->dev, core->name, + core->parent_names, + core->num_parents, + core->flag == CLK_MUX_READ_ONLY ? + CLK_SET_RATE_PARENT : 0, + base + GET_REG(core->conf), + GET_SHIFT(core->conf), + GET_WIDTH(core->conf), + core->flag, &priv->rmw_lock); + + if (IS_ERR(clk_hw)) + return NULL; + + return clk_hw->clk; +} + +struct div2_clk { + struct clk_hw hw; + unsigned int conf; + unsigned int confs; + const struct clk_div_table *dtable; + const struct clk_div_table *dtables; + void __iomem *base; + struct rzg2l_cpg_priv *priv; +}; + +#define to_d2clk(_hw) container_of(_hw, struct div2_clk, hw) + +static unsigned int div2_clock_get_div(unsigned int val, + const struct clk_div_table *t, + unsigned int length) +{ + unsigned int i; + + for (i = 0; i <= length; i++) + if (val == t[i].val) + return t[i].div; + + /* return div=1 if failed */ + return 1; +} + +static unsigned long +rzg2l_cpg_div2_clk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct div2_clk *d2clk = to_d2clk(hw); + u32 div, divs, val, vals; + + val = readl(d2clk->base + GET_REG(d2clk->conf)); + div = DIV_RSMASK(val, GET_SHIFT(d2clk->conf), + (BIT(GET_WIDTH(d2clk->conf)) - 1)); + div = div2_clock_get_div(div, d2clk->dtable, + (BIT(GET_WIDTH(d2clk->conf)) - 1)); + + vals = readl(d2clk->base + GET_REG(d2clk->confs)); + divs = DIV_RSMASK(val, GET_SHIFT(d2clk->confs), + (BIT(GET_WIDTH(d2clk->confs)) - 1)); + divs = div2_clock_get_div(divs, d2clk->dtables, + (BIT(GET_WIDTH(d2clk->confs)) - 1)); + + div = div * divs; + + return DIV_ROUND_CLOSEST_ULL((u64)parent_rate, div); +} + +static int rzg2l_cpg_div2_clk_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + unsigned long best_diff = (unsigned long)-1; + unsigned int best_div, best_divs, div, divs; + struct div2_clk *d2clk = to_d2clk(hw); + unsigned int i, j, n, ns; + unsigned long diff; + + n = BIT(GET_WIDTH(d2clk->conf)) - 1; + ns = BIT(GET_WIDTH(d2clk->confs)) - 1; + for (i = 0; i <= n; i++) { + for (j = 0; j <= ns; j++) { + div = div2_clock_get_div(i, d2clk->dtable, n); + divs = div2_clock_get_div(j, d2clk->dtables, ns); + diff = abs(req->best_parent_rate - (req->rate * div * divs)); + if (best_diff > diff) { + best_diff = diff; + best_div = div; + best_divs = divs; + } + } + } + + req->rate = DIV_ROUND_CLOSEST_ULL((u64)req->best_parent_rate, best_div * best_divs); + return 0; +} + +static int rzg2l_cpg_div2_clk_set_rate(struct clk_hw *hw, + unsigned long rate, + unsigned long parent_rate) +{ + unsigned long best_diff = (unsigned long)-1; + struct div2_clk *d2clk = to_d2clk(hw); + struct rzg2l_cpg_priv *priv = d2clk->priv; + unsigned int div, divs, val, vals, n, ns; + unsigned long diff, flags; + unsigned int i, j; + + n = BIT(GET_WIDTH(d2clk->conf)) - 1; + ns = BIT(GET_WIDTH(d2clk->confs)) - 1; + for (i = 0; i <= n; i++) { + for (j = 0; j <= ns; j++) { + div = div2_clock_get_div(i, d2clk->dtable, n); + divs = div2_clock_get_div(j, d2clk->dtables, ns); + diff = abs(parent_rate - (rate * div * divs)); + if (best_diff > diff) { + best_diff = diff; + val = i; + vals = j; + } + } + } + + spin_lock_irqsave(&priv->rmw_lock, flags); + + val = (val << GET_SHIFT(d2clk->conf)) | + (0x1 << (GET_SHIFT(d2clk->conf) + 16)); + writel(val, d2clk->base + GET_REG(d2clk->conf)); + + vals = (vals << GET_SHIFT(d2clk->confs)) | + (0x1 << (GET_SHIFT(d2clk->confs) + 16)); + writel(vals, d2clk->base + GET_REG(d2clk->confs)); + + spin_unlock_irqrestore(&priv->rmw_lock, flags); + + return 0; +} + +static const struct clk_ops rzg2l_cpg_div2_ops = { + .recalc_rate = rzg2l_cpg_div2_clk_recalc_rate, + .determine_rate = rzg2l_cpg_div2_clk_determine_rate, + .set_rate = rzg2l_cpg_div2_clk_set_rate, +}; + +static struct clk * __init +rzg2l_cpg_div2_clk_register(const struct cpg_core_clk *core, + struct clk **clks, + void __iomem *base, + struct rzg2l_cpg_priv *priv) +{ + const struct clk *parent; + struct clk_init_data init; + struct div2_clk *d2clk; + struct device *dev = priv->dev; + struct clk *clk; + const char *parent_name; + + parent = clks[core->parent & 0xffff]; + if (IS_ERR(parent)) + return ERR_CAST(parent); + + d2clk = devm_kzalloc(dev, sizeof(*d2clk), GFP_KERNEL); + if (!d2clk) { + clk = ERR_PTR(-ENOMEM); + return NULL; + } + + parent_name = __clk_get_name(parent); + init.name = core->name; + init.ops = &rzg2l_cpg_div2_ops; + init.flags = 0; + init.parent_names = &parent_name; + init.num_parents = 1; + + d2clk->hw.init = &init; + d2clk->conf = core->conf; + d2clk->confs = core->confs; + d2clk->dtable = core->dtable; + d2clk->dtables = core->dtables; + d2clk->base = base; + d2clk->priv = priv; + + clk = clk_register(NULL, &d2clk->hw); + if (IS_ERR(clk)) + kfree(d2clk); + + return clk; +} + +struct pll_clk { + struct clk_hw hw; + unsigned int stby_conf; + unsigned int mon_conf; + unsigned int conf; + unsigned int type; + void __iomem *base; + struct rzg2l_cpg_priv *priv; +}; + +#define to_pll(_hw) container_of(_hw, struct pll_clk, hw) + +static unsigned long rzg2l_cpg_pll_clk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct pll_clk *pll_clk = to_pll(hw); + struct rzg2l_cpg_priv *priv = pll_clk->priv; + unsigned int val1, val2, val3; + unsigned int mult = 1; + unsigned int div = 1; + + if (pll_clk->type == CLK_TYPE_SAM_PLL) { + val1 = readl(priv->base + GET_REG1(pll_clk->conf)); + val2 = readl(priv->base + GET_REG2(pll_clk->conf)); + mult = MDIV(val1) + KDIV(val1) / 65536; + div = PDIV(val1) * (1 << SDIV(val2)); + } else if (pll_clk->type == CLK_TYPE_SI_PLL) { + val1 = readl(priv->base + GET_REG1(pll_clk->conf)); + val2 = readl(priv->base + GET_REG2(pll_clk->conf)); + val3 = readl(priv->base + GET_REG3(pll_clk->conf)); + + mult = INITIN(val3) + FRACIN(val2) / (0x1 << 24); + div = POSTDIV1(val1) * POSTDIV2(val1) * REFDIV(val1); + } else { + return 0; + } + + return DIV_ROUND_CLOSEST_ULL((u64)parent_rate * mult, div); +} + +static const struct clk_ops rzg2l_cpg_pll_ops = { + .recalc_rate = rzg2l_cpg_pll_clk_recalc_rate, +}; + +static struct clk * __init +rzg2l_cpg_pll_clk_register(const struct cpg_core_clk *core, + struct clk **clks, + void __iomem *base, + struct rzg2l_cpg_priv *priv) +{ + struct device *dev = priv->dev; + const struct clk *parent; + struct clk_init_data init; + const char *parent_name; + struct pll_clk *pll_clk; + struct clk *clk; + + parent = clks[core->parent & 0xffff]; + if (IS_ERR(parent)) + return ERR_CAST(parent); + + pll_clk = devm_kzalloc(dev, sizeof(*pll_clk), GFP_KERNEL); + if (!pll_clk) { + clk = ERR_PTR(-ENOMEM); + return NULL; + } + + parent_name = __clk_get_name(parent); + init.name = core->name; + init.ops = &rzg2l_cpg_pll_ops; + init.flags = 0; + init.parent_names = &parent_name; + init.num_parents = 1; + + pll_clk->hw.init = &init; + pll_clk->stby_conf = core->stby_conf; + pll_clk->mon_conf = core->mon_conf; + pll_clk->conf = core->conf; + pll_clk->base = base; + pll_clk->priv = priv; + pll_clk->type = core->type; + + clk = clk_register(NULL, &pll_clk->hw); + if (IS_ERR(clk)) + kfree(pll_clk); + + return clk; +} + +static struct clk +*rzg2l_cpg_clk_src_twocell_get(struct of_phandle_args *clkspec, + void *data) +{ + unsigned int clkidx = clkspec->args[1]; + struct rzg2l_cpg_priv *priv = data; + struct device *dev = priv->dev; + const char *type; + struct clk *clk; + + switch (clkspec->args[0]) { + case CPG_CORE: + type = "core"; + if (clkidx > priv->last_dt_core_clk) { + dev_err(dev, "Invalid %s clock index %u\n", type, clkidx); + return ERR_PTR(-EINVAL); + } + clk = priv->clks[clkidx]; + break; + + case CPG_MOD: + type = "module"; + if (clkidx > priv->num_core_clks + priv->num_mod_clks) { + dev_err(dev, "Invalid %s clock index %u\n", type, + clkidx); + return ERR_PTR(-EINVAL); + } + clk = priv->clks[priv->num_core_clks + clkidx]; + break; + + default: + dev_err(dev, "Invalid CPG clock type %u\n", clkspec->args[0]); + return ERR_PTR(-EINVAL); + } + + if (IS_ERR(clk)) + dev_err(dev, "Cannot get %s clock %u: %ld", type, clkidx, + PTR_ERR(clk)); + else + dev_dbg(dev, "clock (%u, %u) is %pC at %lu Hz\n", + clkspec->args[0], clkspec->args[1], clk, + clk_get_rate(clk)); + return clk; +} + +static void __init +rzg2l_cpg_register_core_clk(const struct cpg_core_clk *core, + const struct rzg2l_cpg_info *info, + struct rzg2l_cpg_priv *priv) +{ + struct clk *clk = ERR_PTR(-EOPNOTSUPP), *parent; + struct device *dev = priv->dev; + unsigned int id = core->id, div = core->div; + const char *parent_name; + + WARN_DEBUG(id >= priv->num_core_clks); + WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT); + + if (!core->name) { + /* Skip NULLified clock */ + return; + } + + switch (core->type) { + case CLK_TYPE_IN: + clk = of_clk_get_by_name(priv->dev->of_node, core->name); + break; + case CLK_TYPE_FF: + WARN_DEBUG(core->parent >= priv->num_core_clks); + parent = priv->clks[core->parent]; + if (IS_ERR(parent)) { + clk = parent; + goto fail; + } + + parent_name = __clk_get_name(parent); + clk = clk_register_fixed_factor(NULL, core->name, + parent_name, CLK_SET_RATE_PARENT, + core->mult, div); + break; + case CLK_TYPE_SAM_PLL: + case CLK_TYPE_SI_PLL: + clk = rzg2l_cpg_pll_clk_register(core, priv->clks, + priv->base, priv); + break; + case CLK_TYPE_DIV: + clk = rzg2l_cpg_div_clk_register(core, priv->clks, + priv->base, priv); + break; + case CLK_TYPE_2DIV: + clk = rzg2l_cpg_div2_clk_register(core, priv->clks, + priv->base, priv); + break; + case CLK_TYPE_MUX: + clk = rzg2l_cpg_sell_clk_register(core, priv->base, priv); + break; + default: + goto fail; + }; + + if (IS_ERR_OR_NULL(clk)) + goto fail; + + dev_dbg(dev, "Core clock %pC at %lu Hz\n", clk, clk_get_rate(clk)); + priv->clks[id] = clk; + return; + +fail: + dev_err(dev, "Failed to register %s clock %s: %ld\n", "core", + core->name, PTR_ERR(clk)); +} + +/** + * struct mstp_clock - MSTP gating clock + * + * @hw: handle between common and hardware-specific interfaces + * @off: register offset + * @onoff: ON/MON bits + * @reset: reset bits + * @priv: CPG/MSTP private data + */ +struct mstp_clock { + struct clk_hw hw; + u16 off; + u8 onoff; + u8 reset; + struct rzg2l_cpg_priv *priv; +}; + +#define to_mod_clock(_hw) container_of(_hw, struct mstp_clock, hw) + +static int rzg2l_mod_clock_endisable(struct clk_hw *hw, bool enable) +{ + struct mstp_clock *clock = to_mod_clock(hw); + struct rzg2l_cpg_priv *priv = clock->priv; + unsigned int reg = clock->off; + struct device *dev = priv->dev; + unsigned long flags; + unsigned int i; + u32 value; + + if (!clock->off) { + dev_dbg(dev, "%pC does not support ON/OFF\n", hw->clk); + return 0; + } + + dev_dbg(dev, "CLK_ON %u/%pC %s\n", CLK_ON_R(reg), hw->clk, + enable ? "ON" : "OFF"); + spin_lock_irqsave(&priv->rmw_lock, flags); + + if (enable) + value = (clock->onoff << 16) | clock->onoff; + else + value = clock->onoff << 16; + writel(value, priv->base + CLK_ON_R(reg)); + + spin_unlock_irqrestore(&priv->rmw_lock, flags); + + if (!enable) + return 0; + + for (i = 1000; i > 0; --i) { + if (((readl(priv->base + CLK_MON_R(reg))) & clock->onoff)) + break; + cpu_relax(); + } + + if (!i) { + dev_err(dev, "Failed to enable CLK_ON %p\n", + priv->base + CLK_ON_R(reg)); + return -ETIMEDOUT; + } + + return 0; +} + +static int rzg2l_mod_clock_enable(struct clk_hw *hw) +{ + return rzg2l_mod_clock_endisable(hw, true); +} + +static void rzg2l_mod_clock_disable(struct clk_hw *hw) +{ + rzg2l_mod_clock_endisable(hw, false); +} + +static int rzg2l_mod_clock_is_enabled(struct clk_hw *hw) +{ + struct mstp_clock *clock = to_mod_clock(hw); + struct rzg2l_cpg_priv *priv = clock->priv; + u32 value; + + if (!clock->off) { + dev_dbg(priv->dev, "%pC does not support ON/OFF\n", hw->clk); + return 1; + } + + value = readl(priv->base + CLK_MON_R(clock->off)); + + return !(value & clock->onoff); +} + +static const struct clk_ops rzg2l_mod_clock_ops = { + .enable = rzg2l_mod_clock_enable, + .disable = rzg2l_mod_clock_disable, + .is_enabled = rzg2l_mod_clock_is_enabled, +}; + +static void __init +rzg2l_cpg_register_mod_clk(const struct rzg2l_mod_clk *mod, + const struct rzg2l_cpg_info *info, + struct rzg2l_cpg_priv *priv) +{ + struct mstp_clock *clock = NULL; + struct device *dev = priv->dev; + unsigned int id = mod->id; + struct clk_init_data init; + struct clk *parent, *clk; + const char *parent_name; + unsigned int i; + + WARN_DEBUG(id < priv->num_core_clks); + WARN_DEBUG(id >= priv->num_core_clks + priv->num_mod_clks); + WARN_DEBUG(mod->parent >= priv->num_core_clks + priv->num_mod_clks); + WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT); + + if (!mod->name) { + /* Skip NULLified clock */ + return; + } + + parent = priv->clks[mod->parent]; + if (IS_ERR(parent)) { + clk = parent; + goto fail; + } + + clock = devm_kzalloc(dev, sizeof(*clock), GFP_KERNEL); + if (!clock) { + clk = ERR_PTR(-ENOMEM); + goto fail; + } + + init.name = mod->name; + init.ops = &rzg2l_mod_clock_ops; + init.flags = CLK_SET_RATE_PARENT; + for (i = 0; i < info->num_crit_mod_clks; i++) + if (id == info->crit_mod_clks[i]) { + dev_dbg(dev, "CPG %s setting CLK_IS_CRITICAL\n", + mod->name); + init.flags |= CLK_IS_CRITICAL; + break; + } + + parent_name = __clk_get_name(parent); + init.parent_names = &parent_name; + init.num_parents = 1; + + clock->off = mod->off; + clock->onoff = mod->onoff; + clock->reset = mod->reset; + clock->priv = priv; + clock->hw.init = &init; + + clk = clk_register(NULL, &clock->hw); + if (IS_ERR(clk)) + goto fail; + + dev_dbg(dev, "Module clock %pC at %lu Hz\n", clk, clk_get_rate(clk)); + priv->clks[id] = clk; + return; + +fail: + dev_err(dev, "Failed to register %s clock %s: %ld\n", "module", + mod->name, PTR_ERR(clk)); + kfree(clock); +} + +#ifdef CONFIG_RESET_CONTROLLER + +#define rcdev_to_priv(x) container_of(x, struct rzg2l_cpg_priv, rcdev) + +static int rzg2l_cpg_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct rzg2l_cpg_priv *priv = rcdev_to_priv(rcdev); + const struct rzg2l_cpg_info *info = priv->info; + unsigned int reg = info->mod_clks[id].off; + u32 dis = info->mod_clks[id].reset; + u32 we = dis << 16; + + dev_dbg(rcdev->dev, "reset name:%s id:%ld offset:0x%x\n", + info->mod_clks[id].name, id, CLK_RST_R(reg)); + + /* Reset module */ + writel(we, priv->base + CLK_RST_R(reg)); + + /* Wait for at least one cycle of the RCLK clock (@ ca. 32 kHz) */ + udelay(35); + + /* Release module from reset state */ + writel(we | dis, priv->base + CLK_RST_R(reg)); + + return 0; +} + +static int rzg2l_cpg_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct rzg2l_cpg_priv *priv = rcdev_to_priv(rcdev); + const struct rzg2l_cpg_info *info = priv->info; + unsigned int reg = info->mod_clks[id].off; + u32 value = info->mod_clks[id].reset << 16; + + dev_dbg(rcdev->dev, "assert name:%s id:%ld offset:0x%x\n", + info->mod_clks[id].name, id, CLK_RST_R(reg)); + + writel(value, priv->base + CLK_RST_R(reg)); + return 0; +} + +static int rzg2l_cpg_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct rzg2l_cpg_priv *priv = rcdev_to_priv(rcdev); + const struct rzg2l_cpg_info *info = priv->info; + unsigned int reg = info->mod_clks[id].off; + u32 dis = info->mod_clks[id].reset; + u32 value = (dis << 16) | dis; + + dev_dbg(rcdev->dev, "deassert name:%s id:%ld offset:0x%x\n", + info->mod_clks[id].name, id, CLK_RST_R(reg)); + + writel(value, priv->base + CLK_RST_R(reg)); + return 0; +} + +static int rzg2l_cpg_status(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct rzg2l_cpg_priv *priv = rcdev_to_priv(rcdev); + const struct rzg2l_cpg_info *info = priv->info; + unsigned int reg = info->mod_clks[id].off; + u32 bitmask = info->mod_clks[id].reset; + + return !(readl(priv->base + CLK_MRST_R(reg)) & bitmask); +} + +static const struct reset_control_ops rzg2l_cpg_reset_ops = { + .reset = rzg2l_cpg_reset, + .assert = rzg2l_cpg_assert, + .deassert = rzg2l_cpg_deassert, + .status = rzg2l_cpg_status, +}; + +static int rzg2l_cpg_reset_xlate(struct reset_controller_dev *rcdev, + const struct of_phandle_args *reset_spec) +{ + unsigned int id = reset_spec->args[0]; + + if (id >= rcdev->nr_resets) { + dev_err(rcdev->dev, "Invalid reset index %u\n", id); + return -EINVAL; + } + + return id; +} + +static int rzg2l_cpg_reset_controller_register(struct rzg2l_cpg_priv *priv) +{ + priv->rcdev.ops = &rzg2l_cpg_reset_ops; + priv->rcdev.of_node = priv->dev->of_node; + priv->rcdev.dev = priv->dev; + priv->rcdev.of_reset_n_cells = 1; + priv->rcdev.of_xlate = rzg2l_cpg_reset_xlate; + priv->rcdev.nr_resets = priv->num_mod_clks; + + return devm_reset_controller_register(priv->dev, &priv->rcdev); +} + +#else /* !CONFIG_RESET_CONTROLLER */ +static int rzg2l_cpg_reset_controller_register(struct rzg2l_cpg_priv *priv) +{ + return 0; +} +#endif /* !CONFIG_RESET_CONTROLLER */ + +static bool rzg2l_cpg_is_pm_clk(const struct of_phandle_args *clkspec) +{ + if (clkspec->args_count != 2) + return false; + + switch (clkspec->args[0]) { + case CPG_MOD: + return true; + + default: + return false; + } +} + +static int rzg2l_cpg_attach_dev(struct generic_pm_domain *unused, struct device *dev) +{ + struct device_node *np = dev->of_node; + struct of_phandle_args clkspec; + struct clk *clk; + int error; + int i = 0; + + while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i, + &clkspec)) { + if (rzg2l_cpg_is_pm_clk(&clkspec)) + goto found; + + of_node_put(clkspec.np); + i++; + } + + return 0; + +found: + clk = of_clk_get_from_provider(&clkspec); + of_node_put(clkspec.np); + + if (IS_ERR(clk)) + return PTR_ERR(clk); + + error = pm_clk_create(dev); + if (error) + goto fail_put; + + error = pm_clk_add_clk(dev, clk); + if (error) + goto fail_destroy; + + return 0; + +fail_destroy: + pm_clk_destroy(dev); +fail_put: + clk_put(clk); + return error; +} + +static void rzg2l_cpg_detach_dev(struct generic_pm_domain *unused, struct device *dev) +{ + if (!pm_clk_no_clocks(dev)) + pm_clk_destroy(dev); +} + +static int __init rzg2l_cpg_add_clk_domain(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct generic_pm_domain *genpd; + + genpd = devm_kzalloc(dev, sizeof(*genpd), GFP_KERNEL); + if (!genpd) + return -ENOMEM; + + genpd->name = np->name; + genpd->flags = GENPD_FLAG_PM_CLK | GENPD_FLAG_ALWAYS_ON | + GENPD_FLAG_ACTIVE_WAKEUP; + genpd->attach_dev = rzg2l_cpg_attach_dev; + genpd->detach_dev = rzg2l_cpg_detach_dev; + pm_genpd_init(genpd, &pm_domain_always_on_gov, false); + + of_genpd_add_provider_simple(np, genpd); + return 0; +} + +static int __init rzg2l_cpg_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + const struct rzg2l_cpg_info *info; + struct rzg2l_cpg_priv *priv; + unsigned int nclks, i; + struct clk **clks; + int error; + + info = of_device_get_match_data(dev); + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + priv->info = info; + spin_lock_init(&priv->rmw_lock); + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + nclks = info->num_total_core_clks + info->num_hw_mod_clks; + clks = devm_kmalloc_array(dev, nclks, sizeof(*clks), GFP_KERNEL); + if (!clks) + return -ENOMEM; + + dev_set_drvdata(dev, priv); + priv->clks = clks; + priv->num_core_clks = info->num_total_core_clks; + priv->num_mod_clks = info->num_hw_mod_clks; + priv->last_dt_core_clk = info->last_dt_core_clk; + + for (i = 0; i < nclks; i++) + clks[i] = ERR_PTR(-ENOENT); + + for (i = 0; i < info->num_core_clks; i++) + rzg2l_cpg_register_core_clk(&info->core_clks[i], info, priv); + + for (i = 0; i < info->num_mod_clks; i++) + rzg2l_cpg_register_mod_clk(&info->mod_clks[i], info, priv); + + error = of_clk_add_provider(np, rzg2l_cpg_clk_src_twocell_get, priv); + if (error) + return error; + + error = devm_add_action_or_reset(dev, rzg2l_cpg_del_clk_provider, np); + if (error) + return error; + + error = rzg2l_cpg_add_clk_domain(dev); + if (error) + return error; + + error = rzg2l_cpg_reset_controller_register(priv); + if (error) + return error; + + return 0; +} + +static const struct of_device_id rzg2l_cpg_match[] = { + { /* sentinel */ } +}; + +static struct platform_driver rzg2l_cpg_driver = { + .driver = { + .name = "rzg2l-cpg", + .of_match_table = rzg2l_cpg_match, + }, +}; + +static int __init rzg2l_cpg_init(void) +{ + return platform_driver_probe(&rzg2l_cpg_driver, rzg2l_cpg_probe); +} + +subsys_initcall(rzg2l_cpg_init); + +MODULE_DESCRIPTION("Renesas RZ/G2L CPG Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/clk/renesas/renesas-rzg2l-cpg.h b/drivers/clk/renesas/renesas-rzg2l-cpg.h new file mode 100644 index 000000000000..8e7117e7f79b --- /dev/null +++ b/drivers/clk/renesas/renesas-rzg2l-cpg.h @@ -0,0 +1,215 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * RZ/G2L Clock Pulse Generator + * + * Copyright (C) 2021 Renesas Electronics Corp. + * + */ + +#ifndef __RENESAS_RZG2L_CPG_H__ +#define __RENESAS_RZG2L_CPG_H__ + +/* Register offset */ +/* n : 0, 1, 2 : PLL1, PLL4, PLL6 */ +#define PLL146_CLK1_R(n) (0x04 + (16 * n)) +#define PLL146_CLK2_R(n) (0x08 + (16 * n)) +#define PLL146_MON_R(n) (0x0C + (16 * n)) +#define PLL146_STBY_R(n) (0x00 + (16 * n)) + +/* n : 0, 1, 2 : PLL2, PLL3, PLL5 */ +#define PLL235_CLK1_R(n) (0x104 + (32 * n)) +#define PLL235_CLK3_R(n) (0x10c + (32 * n)) +#define PLL235_CLK4_R(n) (0x110 + (32 * n)) +#define PLL235_MON_R(n) (0x11C + (32 * n)) +#define PLL235_STBY_R(n) (0x100 + (32 * n)) + +#define PLL1_DIV_R (0x200) +#define PLL2_DIV_R (0x204) +#define PLL3A_DIV_R (0x208) +#define PLL3B_DIV_R (0x20c) +#define PLL6_DIV_R (0x210) +#define PL2SDHI_SEL_R (0x218) +#define CLK_STATUS_R (0x280) +#define CA55_SSEL_R (0x400) +#define PL2_SSEL_R (0x404) +#define PL3_SSEL_R (0x408) +#define PL4_DSEL_R (0x21C) +#define PL5_SSEL_R (0x410) +#define PL6_SSEL_R (0x414) +#define PL6_ETH_SSEL_R (0x418) +#define PL5_SDIV_R (0x420) +#define OTHERFUNC1_R (0xBE8) + +#define SEL_PLL1 (CA55_SSEL_R << 20 | 0 << 12 | 1 << 8) +#define SEL_PLL2_1 (PL2_SSEL_R << 20 | 0 << 12 | 1 << 8) +#define SEL_PLL2_2 (PL2_SSEL_R << 20 | 4 << 12 | 1 << 8) +#define SEL_PLL3_1 (PL3_SSEL_R << 20 | 0 << 12 | 1 << 8) +#define SEL_PLL3_2 (PL3_SSEL_R << 20 | 4 << 12 | 1 << 8) +#define SEL_PLL3_3 (PL3_SSEL_R << 20 | 8 << 12 | 1 << 8) +#define SEL_PLL4 (PL4_DSEL_R << 20 | 8 << 12 | 1 << 8) +#define SEL_PLL5_1 (PL5_SSEL_R << 20 | 0 << 12 | 1 << 8) +#define SEL_PLL5_2 (PL5_SSEL_R << 20 | 4 << 12 | 1 << 8) +#define SEL_PLL5_3 (PL5_SSEL_R << 20 | 0 << 12 | 1 << 8) +#define SEL_PLL5_4 (OTHERFUNC1_R << 20 | 0 << 12 | 1 << 8) +#define SEL_PLL6_1 (PL6_SSEL_R << 20 | 0 << 12 | 1 << 8) +#define SEL_PLL6_2 (PL6_ETH_SSEL_R << 20 | 0 << 12 | 1 << 8) +#define SEL_ETH (PL6_ETH_SSEL_R << 20 | 4 << 12 | 1 << 8) +#define SEL_G1_1 (PL6_SSEL_R << 20 | 4 << 12 | 1 << 8) +#define SEL_G1_2 (PL6_SSEL_R << 20 | 8 << 12 | 1 << 8) +#define SEL_G2 (PL6_SSEL_R << 20 | 12 << 12 | 1 << 8) +#define SEL_SDHI0 (PL2SDHI_SEL_R << 20 | 0 << 12 | 2 << 8) +#define SEL_SDHI1 (PL2SDHI_SEL_R << 20 | 4 << 12 | 2 << 8) +#define DIVPL1 (PLL1_DIV_R << 20 | 0 << 12 | 2 << 8) +#define DIVPL2A (PLL2_DIV_R << 20 | 0 << 12 | 3 << 8) +#define DIVPL2B (PLL2_DIV_R << 20 | 4 << 12 | 3 << 8) +#define DIVPL2C (PLL2_DIV_R << 20 | 8 << 12 | 3 << 8) +#define DIVDSILPCL (PLL2_DIV_R << 20 | 12 << 12 | 2 << 8) +#define DIVPL3A (PLL3A_DIV_R << 20 | 0 << 12 | 3 << 8) +#define DIVPL3B (PLL3A_DIV_R << 20 | 4 << 12 | 3 << 8) +#define DIVPL3C (PLL3A_DIV_R << 20 | 8 << 12 | 3 << 8) +#define DIVPL3CLK200FIX (PLL3B_DIV_R << 20 | 0 << 12 | 3 << 8) +#define DIVGPU (PLL6_DIV_R << 20 | 0 << 12 | 2 << 8) +#define DIVDSIB (PL5_SDIV_R << 20 | 8 << 12 | 4 << 8) +#define DIVDSIA (PL5_SDIV_R << 20 | 0 << 12 | 2 << 8) + +#define PLL146_STBY(n) (PLL146_STBY_R(n) << 20 | 2 << 16 | 0 << 12) +#define PLL146_MON(n) (PLL146_MON_R(n) << 20 | 4 << 16 | 0 << 12) +#define PLL235_STBY(n) (PLL235_STBY_R(n) << 20 | 2 << 16 | 0 << 12) +#define PLL235_MON(n) (PLL235_MON_R(n) << 20 | 4 << 16 | 0 << 12) + +#define PLL146_CONF(n) (PLL146_CLK1_R(n) << 22 | PLL146_CLK2_R(n) << 12 | 0) +#define PLL235_CONF(n) (PLL235_CLK1_R(n) << 22 | PLL235_CLK3_R(n) << 12 | PLL235_CLK4_R(n)) + +/** + * Definitions of CPG Core Clocks + * + * These include: + * - Clock outputs exported to DT + * - External input clocks + * - Internal CPG clocks + */ +struct cpg_core_clk { + const char *name; + unsigned int id; + unsigned int parent; + unsigned int div; + unsigned int mult; + unsigned int type; + unsigned int conf; + const struct clk_div_table *dtable; + int flag; + const char * const *parent_names; + int num_parents; + + /* used for clocks with two configs */ + unsigned int confs; + const struct clk_div_table *dtables; + unsigned int stby_conf; + unsigned int mon_conf; +}; + +enum clk_types { + /* Generic */ + CLK_TYPE_IN, /* External Clock Input */ + CLK_TYPE_FF, /* Fixed Factor Clock */ + CLK_TYPE_SAM_PLL, + CLK_TYPE_SI_PLL, + + /* Clock with divider */ + CLK_TYPE_DIV, + CLK_TYPE_2DIV, + + /* Clock with selector */ + CLK_TYPE_MUX, + + /* Custom definitions start here */ + CLK_TYPE_CUSTOM, +}; + +#define DEF_TYPE(_name, _id, _type...) \ + { .name = _name, .id = _id, .type = _type } +#define DEF_BASE(_name, _id, _type, _parent...) \ + DEF_TYPE(_name, _id, _type, .parent = _parent) +#define DEF_PLL(_name, _id, _type, _parent, _conf, _stby_conf, _mon_conf) \ + DEF_TYPE(_name, _id, _type, .parent = _parent, .conf = _conf, \ + .stby_conf = _stby_conf, .mon_conf = _mon_conf) +#define DEF_INPUT(_name, _id) \ + DEF_TYPE(_name, _id, CLK_TYPE_IN) +#define DEF_FIXED(_name, _id, _parent, _mult, _div) \ + DEF_BASE(_name, _id, CLK_TYPE_FF, _parent, .div = _div, .mult = _mult) +#define DEF_DIV(_name, _id, _parent, _conf, _dtable, _flag) \ + DEF_TYPE(_name, _id, CLK_TYPE_DIV, .conf = _conf, \ + .parent = _parent, .dtable = _dtable, .flag = _flag) +#define DEF_MUX(_name, _id, _conf, _parent_names, _num_parents, _flag) \ + DEF_TYPE(_name, _id, CLK_TYPE_MUX, .conf = _conf, \ + .parent_names = _parent_names, \ + .num_parents = _num_parents, .flag = _flag) +/* Clock with two dividers */ +#define DEF_2DIV(_name, _id, _parent, _conf, _confs, _dtable, _dtables, _flag) \ + DEF_TYPE(_name, _id, CLK_TYPE_2DIV, .parent = _parent, \ + .conf = _conf, .confs = _confs, \ + .dtable = _dtable, .dtables = _dtables, .flag = _flag) + +/** + * struct rzg2l_mod_clk - Module Clocks definitions + * + * @name: handle between common and hardware-specific interfaces + * @id: clock index in array containing all Core and Module Clocks + * @parent: id of parent clock + * @off: register offset + * @onoff: ON/MON bits + * @reset: reset bits + */ +struct rzg2l_mod_clk { + const char *name; + unsigned int id; + unsigned int parent; + u16 off; + u8 onoff; + u8 reset; +}; + +#define DEF_MOD(_name, _id, _parent, _off, _onoff, _reset) \ + [_id] = { \ + .name = _name, \ + .id = MOD_CLK_BASE + _id, \ + .parent = (_parent), \ + .off = (_off), \ + .onoff = (_onoff), \ + .reset = (_reset) \ + } + +/** + * struct rzg2l_cpg_info - SoC-specific CPG Description + * + * @core_clks: Array of Core Clock definitions + * @num_core_clks: Number of entries in core_clks[] + * @last_dt_core_clk: ID of the last Core Clock exported to DT + * @num_total_core_clks: Total number of Core Clocks (exported + internal) + * + * @mod_clks: Array of Module Clock definitions + * @num_mod_clks: Number of entries in mod_clks[] + * @num_hw_mod_clks: Number of Module Clocks supported by the hardware + * + * @crit_mod_clks: Array with Module Clock IDs of critical clocks that + * should not be disabled without a knowledgeable driver + * @num_crit_mod_clks: Number of entries in crit_mod_clks[] + */ +struct rzg2l_cpg_info { + /* Core Clocks */ + const struct cpg_core_clk *core_clks; + unsigned int num_core_clks; + unsigned int last_dt_core_clk; + unsigned int num_total_core_clks; + + /* Module Clocks */ + const struct rzg2l_mod_clk *mod_clks; + unsigned int num_mod_clks; + unsigned int num_hw_mod_clks; + + /* Critical Module Clocks that should not be disabled */ + const unsigned int *crit_mod_clks; + unsigned int num_crit_mod_clks; +}; + +#endif