From patchwork Thu Apr 13 15:26:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 13210399 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 1477DC77B73 for ; Thu, 13 Apr 2023 15:27:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230477AbjDMP1c (ORCPT ); Thu, 13 Apr 2023 11:27:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230368AbjDMP1a (ORCPT ); Thu, 13 Apr 2023 11:27:30 -0400 Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 0CD9AB45F; Thu, 13 Apr 2023 08:27:04 -0700 (PDT) X-IronPort-AV: E=Sophos;i="5.99,194,1677510000"; d="scan'208";a="159329571" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 14 Apr 2023 00:27:04 +0900 Received: from localhost.localdomain (unknown [10.226.93.85]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id DC7ED4005E22; Fri, 14 Apr 2023 00:27:01 +0900 (JST) From: Biju Das To: Michael Turquette , Stephen Boyd Cc: Biju Das , linux-clk@vger.kernel.org, Geert Uytterhoeven , Prabhakar Mahadev Lad , linux-renesas-soc@vger.kernel.org Subject: [PATCH v5 2/3] drivers: clk: Add support for versa3 clock driver Date: Thu, 13 Apr 2023 16:26:47 +0100 Message-Id: <20230413152648.89089-3-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230413152648.89089-1-biju.das.jz@bp.renesas.com> References: <20230413152648.89089-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org Add support for Renesas versa3 clock driver(5p35023). The clock generator provides 6 output clocks. Signed-off-by: Biju Das --- v4->v5: * Added missing .determine_rate() for muxes * Fixed smatch warning: replace divide condition 'req->best_parent_rate / req->rate' with 'req->best_parent_rate >= req->rate' Reported-by: kernel test robot and Reported-by: Dan Carpenter v3->v4: * Fixed the warning reported by kernel test robot. * Added error check for devm_clk_hw_register_fixed_factor_* in probe(). v2->v3: * Updated copy right information. * Removed .name from parent data and started using index or struct clk_hw. * Dropped vc3_clk_out_ops and started using fixed factor clocks for output clk. * Dropped vc3_divider_type_parse_dt function. * Dropped struct vc3_driver_data RFC->v2: * Dropped header file and removed all consumer api's * struct clk_parent_data used for assigning the parent names. * Replaced initpointer->const init pointer in vc3_clk_register * Replaced of_clk_add_hw_provider with devm_clk_add_hw_provider * Dropped vc3_remove() callback. --- drivers/clk/Kconfig | 9 + drivers/clk/Makefile | 1 + drivers/clk/clk-versaclock3.c | 1144 +++++++++++++++++++++++++++++++++ 3 files changed, 1154 insertions(+) create mode 100644 drivers/clk/clk-versaclock3.c diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 016814e15536..73f2ef11ffd5 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -385,6 +385,15 @@ config COMMON_CLK_SI521XX This driver supports the SkyWorks Si521xx PCIe clock generator models Si52144/Si52146/Si52147. +config COMMON_CLK_VC3 + tristate "Clock driver for Renesas VersaClock 3 devices" + depends on I2C + depends on OF + select REGMAP_I2C + help + This driver supports the Renesas VersaClock 3 programmable clock + generators. + config COMMON_CLK_VC5 tristate "Clock driver for IDT VersaClock 5,6 devices" depends on I2C diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 0aebef17edc6..ce1b05e73b6f 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -76,6 +76,7 @@ obj-$(CONFIG_CLK_TWL6040) += clk-twl6040.o obj-$(CONFIG_ARCH_VT8500) += clk-vt8500.o obj-$(CONFIG_COMMON_CLK_RS9_PCIE) += clk-renesas-pcie.o obj-$(CONFIG_COMMON_CLK_SI521XX) += clk-si521xx.o +obj-$(CONFIG_COMMON_CLK_VC3) += clk-versaclock3.o obj-$(CONFIG_COMMON_CLK_VC5) += clk-versaclock5.o obj-$(CONFIG_COMMON_CLK_VC7) += clk-versaclock7.o obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o diff --git a/drivers/clk/clk-versaclock3.c b/drivers/clk/clk-versaclock3.c new file mode 100644 index 000000000000..e89bfe4b8fd4 --- /dev/null +++ b/drivers/clk/clk-versaclock3.c @@ -0,0 +1,1144 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Driver for Renesas Versaclock 3 + * + * Copyright (C) 2023 Renesas Electronics Corp. + */ + +#include +#include +#include +#include +#include + +#define NUM_CONFIG_REGISTERS 37 + +#define VC3_GENERAL_CTR 0x0 +#define VC3_GENERAL_CTR_DIV1_SRC_SEL BIT(3) +#define VC3_GENERAL_CTR_PLL3_REFIN_SEL BIT(2) + +#define VC3_PLL3_M_DIVIDER 0x3 +#define VC3_PLL3_M_DIV1 BIT(7) +#define VC3_PLL3_M_DIV2 BIT(6) +#define VC3_PLL3_M_DIV(n) ((n) & GENMASK(5, 0)) + +#define VC3_PLL3_N_DIVIDER 0x4 +#define VC3_PLL3_LOOP_FILTER_N_DIV_MSB 0x5 + +#define VC3_PLL3_CHARGE_PUMP_CTRL 0x6 +#define VC3_PLL3_CHARGE_PUMP_CTRL_OUTDIV3_SRC_SEL BIT(7) + +#define VC3_PLL1_CTRL_OUTDIV5 0x7 +#define VC3_PLL1_CTRL_OUTDIV5_PLL1_MDIV_DOUBLER BIT(7) + +#define VC3_PLL1_M_DIVIDER 0x8 +#define VC3_PLL1_M_DIV1 BIT(7) +#define VC3_PLL1_M_DIV2 BIT(6) +#define VC3_PLL1_M_DIV(n) ((n) & GENMASK(5, 0)) + +#define VC3_PLL1_VCO_N_DIVIDER 0x9 +#define VC3_PLL1_LOOP_FILTER_N_DIV_MSB 0x0a + +#define VC3_OUT_DIV1_DIV2_CTRL 0xf + +#define VC3_PLL2_FB_INT_DIV_MSB 0x10 +#define VC3_PLL2_FB_INT_DIV_LSB 0x11 +#define VC3_PLL2_FB_FRC_DIV_MSB 0x12 +#define VC3_PLL2_FB_FRC_DIV_LSB 0x13 + +#define VC3_PLL2_M_DIVIDER 0x1a +#define VC3_PLL2_MDIV_DOUBLER BIT(7) +#define VC3_PLL2_M_DIV1 BIT(6) +#define VC3_PLL2_M_DIV2 BIT(5) +#define VC3_PLL2_M_DIV(n) ((n) & GENMASK(4, 0)) + +#define VC3_OUT_DIV3_DIV4_CTRL 0x1b + +#define VC3_PLL_OP_CTRL 0x1c +#define VC3_PLL_OP_CTRL_PLL2_REFIN_SEL 6 + +#define VC3_OUTPUT_CTR 0x1d +#define VC3_OUTPUT_CTR_DIV4_SRC_SEL BIT(3) + +#define VC3_SE2_CTRL_REG0 0x1f +#define VC3_SE2_CTRL_REG0_SE2_CLK_SEL BIT(6) + +#define VC3_SE3_DIFF1_CTRL_REG 0x21 +#define VC3_SE3_DIFF1_CTRL_REG_SE3_CLK_SEL BIT(6) + +#define VC3_DIFF1_CTRL_REG 0x22 +#define VC3_DIFF1_CTRL_REG_DIFF1_CLK_SEL BIT(7) + +#define VC3_DIFF2_CTRL_REG 0x23 +#define VC3_DIFF2_CTRL_REG_DIFF2_CLK_SEL BIT(7) + +#define VC3_SE1_DIV4_CTRL 0x24 +#define VC3_SE1_DIV4_CTRL_SE1_CLK_SEL BIT(3) + +#define VC3_PLL1_VCO_MIN 300000000UL +#define VC3_PLL1_VCO_MAX 600000000UL + +#define VC3_PLL2_VCO_MIN 400000000UL +#define VC3_PLL2_VCO_MAX 1200000000UL + +#define VC3_PLL3_VCO_MIN 300000000UL +#define VC3_PLL3_VCO_MAX 800000000UL + +#define VC3_2_POW_16 (U16_MAX + 1) +#define VC3_DIV_MASK(width) ((1 << (width)) - 1) + +enum vc3_pfd_mux { + VC3_PFD2_MUX, + VC3_PFD3_MUX, +}; + +enum vc3_pfd { + VC3_PFD1, + VC3_PFD2, + VC3_PFD3, +}; + +enum vc3_pll { + VC3_PLL1, + VC3_PLL2, + VC3_PLL3, +}; + +enum vc3_div_mux { + VC3_DIV1_MUX, + VC3_DIV3_MUX, + VC3_DIV4_MUX, +}; + +enum vc3_div { + VC3_DIV1, + VC3_DIV2, + VC3_DIV3, + VC3_DIV4, + VC3_DIV5, +}; + +enum vc3_clk_mux { + VC3_DIFF2_MUX, + VC3_DIFF1_MUX, + VC3_SE3_MUX, + VC3_SE2_MUX, + VC3_SE1_MUX, +}; + +enum vc3_clk { + VC3_DIFF2, + VC3_DIFF1, + VC3_SE3, + VC3_SE2, + VC3_SE1, + VC3_REF, +}; + +struct vc3_clk_data { + u8 offs; + u8 bitmsk; +}; + +struct vc3_pfd_data { + u8 num; + u8 offs; + u8 mdiv1_bitmsk; + u8 mdiv2_bitmsk; +}; + +struct vc3_pll_data { + u8 num; + u8 int_div_msb_offs; + u8 int_div_lsb_offs; + unsigned long vco_min; + unsigned long vco_max; +}; + +struct vc3_div_data { + u8 offs; + const struct clk_div_table *table; + u8 shift; + u8 width; + u8 flags; +}; + +struct vc3_hw_data { + struct clk_hw hw; + struct regmap *regmap; + const void *data; + + u32 div_int; + u32 div_frc; +}; + +static const struct clk_div_table div1_divs[] = { + { .val = 0, .div = 1, }, { .val = 1, .div = 4, }, + { .val = 2, .div = 5, }, { .val = 3, .div = 6, }, + { .val = 4, .div = 2, }, { .val = 5, .div = 8, }, + { .val = 6, .div = 10, }, { .val = 7, .div = 12, }, + { .val = 8, .div = 4, }, { .val = 9, .div = 16, }, + { .val = 10, .div = 20, }, { .val = 11, .div = 24, }, + { .val = 12, .div = 8, }, { .val = 13, .div = 32, }, + { .val = 14, .div = 40, }, { .val = 15, .div = 48, }, + {} +}; + +static const struct clk_div_table div245_divs[] = { + { .val = 0, .div = 1, }, { .val = 1, .div = 3, }, + { .val = 2, .div = 5, }, { .val = 3, .div = 10, }, + { .val = 4, .div = 2, }, { .val = 5, .div = 6, }, + { .val = 6, .div = 10, }, { .val = 7, .div = 20, }, + { .val = 8, .div = 4, }, { .val = 9, .div = 12, }, + { .val = 10, .div = 20, }, { .val = 11, .div = 40, }, + { .val = 12, .div = 5, }, { .val = 13, .div = 15, }, + { .val = 14, .div = 25, }, { .val = 15, .div = 50, }, + {} +}; + +static const struct clk_div_table div3_divs[] = { + { .val = 0, .div = 1, }, { .val = 1, .div = 3, }, + { .val = 2, .div = 5, }, { .val = 3, .div = 10, }, + { .val = 4, .div = 2, }, { .val = 5, .div = 6, }, + { .val = 6, .div = 10, }, { .val = 7, .div = 20, }, + { .val = 8, .div = 4, }, { .val = 9, .div = 12, }, + { .val = 10, .div = 20, }, { .val = 11, .div = 40, }, + { .val = 12, .div = 8, }, { .val = 13, .div = 24, }, + { .val = 14, .div = 40, }, { .val = 15, .div = 80, }, + {} +}; + +static struct clk_hw *clk_out[6]; + +static unsigned char vc3_pfd_mux_get_parent(struct clk_hw *hw) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_clk_data *pfd_mux = vc3->data; + u32 src; + + regmap_read(vc3->regmap, pfd_mux->offs, &src); + + return !!(src & pfd_mux->bitmsk); +} + +static int vc3_pfd_mux_set_parent(struct clk_hw *hw, u8 index) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_clk_data *pfd_mux = vc3->data; + + regmap_update_bits(vc3->regmap, pfd_mux->offs, pfd_mux->bitmsk, + index ? pfd_mux->bitmsk : 0); + return 0; +} + +static const struct clk_ops vc3_pfd_mux_ops = { + .determine_rate = __clk_mux_determine_rate, + .set_parent = vc3_pfd_mux_set_parent, + .get_parent = vc3_pfd_mux_get_parent, +}; + +static unsigned long vc3_pfd_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_pfd_data *pfd = vc3->data; + unsigned int prediv, premul; + unsigned long rate; + u8 mdiv; + + regmap_read(vc3->regmap, pfd->offs, &prediv); + if (pfd->num == VC3_PFD1) { + /* The bypass_prediv is set, PLL fed from Ref_in directly. */ + if (prediv & pfd->mdiv1_bitmsk) { + /* check doubler is set or not */ + regmap_read(vc3->regmap, VC3_PLL1_CTRL_OUTDIV5, &premul); + if (premul & VC3_PLL1_CTRL_OUTDIV5_PLL1_MDIV_DOUBLER) + parent_rate *= 2; + return parent_rate; + } + mdiv = VC3_PLL1_M_DIV(prediv); + } else if (pfd->num == VC3_PFD2) { + /* The bypass_prediv is set, PLL fed from Ref_in directly. */ + if (prediv & pfd->mdiv1_bitmsk) { + regmap_read(vc3->regmap, VC3_PLL2_M_DIVIDER, &premul); + /* check doubler is set or not */ + if (premul & VC3_PLL2_MDIV_DOUBLER) + parent_rate *= 2; + return parent_rate; + } + + mdiv = VC3_PLL2_M_DIV(prediv); + } else { + /* The bypass_prediv is set, PLL fed from Ref_in directly. */ + if (prediv & pfd->mdiv1_bitmsk) + return parent_rate; + + mdiv = VC3_PLL3_M_DIV(prediv); + } + + if (prediv & pfd->mdiv2_bitmsk) + rate = parent_rate / 2; + else + rate = parent_rate / mdiv; + + return rate; +} + +static long vc3_pfd_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_pfd_data *pfd = vc3->data; + unsigned long idiv; + + /* PLL cannot operate with input clock above 50 MHz. */ + if (rate > 50000000) + return -EINVAL; + + /* CLKIN within range of PLL input, feed directly to PLL. */ + if (*parent_rate <= 50000000) + return *parent_rate; + + idiv = DIV_ROUND_UP(*parent_rate, rate); + if (pfd->num == VC3_PFD1 || pfd->num == VC3_PFD3) { + if (idiv > 63) + return -EINVAL; + } else { + if (idiv > 31) + return -EINVAL; + } + + return *parent_rate / idiv; +} + +static int vc3_pfd_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_pfd_data *pfd = vc3->data; + unsigned long idiv; + u8 div; + + /* CLKIN within range of PLL input, feed directly to PLL. */ + if (parent_rate <= 50000000) { + regmap_update_bits(vc3->regmap, pfd->offs, pfd->mdiv1_bitmsk, + pfd->mdiv1_bitmsk); + regmap_update_bits(vc3->regmap, pfd->offs, pfd->mdiv2_bitmsk, 0); + return 0; + } + + idiv = DIV_ROUND_UP(parent_rate, rate); + /* We have dedicated div-2 predivider. */ + if (idiv == 2) { + regmap_update_bits(vc3->regmap, pfd->offs, pfd->mdiv2_bitmsk, + pfd->mdiv2_bitmsk); + regmap_update_bits(vc3->regmap, pfd->offs, pfd->mdiv1_bitmsk, 0); + } else { + if (pfd->num == VC3_PFD1) + div = VC3_PLL1_M_DIV(idiv); + else if (pfd->num == VC3_PFD2) + div = VC3_PLL2_M_DIV(idiv); + else + div = VC3_PLL3_M_DIV(idiv); + + regmap_write(vc3->regmap, pfd->offs, div); + } + + return 0; +} + +static const struct clk_ops vc3_pfd_ops = { + .recalc_rate = vc3_pfd_recalc_rate, + .round_rate = vc3_pfd_round_rate, + .set_rate = vc3_pfd_set_rate, +}; + +static unsigned long vc3_pll_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_pll_data *pll = vc3->data; + u32 div_int, div_frc, val; + unsigned long rate; + + regmap_read(vc3->regmap, pll->int_div_msb_offs, &val); + div_int = (val & GENMASK(2, 0)) << 8; + regmap_read(vc3->regmap, pll->int_div_lsb_offs, &val); + div_int |= val; + + if (pll->num == VC3_PLL2) { + regmap_read(vc3->regmap, VC3_PLL2_FB_FRC_DIV_MSB, &val); + div_frc = val << 8; + regmap_read(vc3->regmap, VC3_PLL2_FB_FRC_DIV_LSB, &val); + div_frc |= val; + rate = (parent_rate * + (div_int * VC3_2_POW_16 + div_frc) / VC3_2_POW_16); + } else { + rate = parent_rate * div_int; + } + + return rate; +} + +static long vc3_pll_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_pll_data *pll = vc3->data; + u64 div_frc; + + if (rate < pll->vco_min) + rate = pll->vco_min; + if (rate > pll->vco_max) + rate = pll->vco_max; + + vc3->div_int = rate / *parent_rate; + + if (pll->num == VC3_PLL2) { + if (vc3->div_int > 0x7ff) + rate = *parent_rate * 0x7ff; + + /* Determine best fractional part, which is 16 bit wide */ + div_frc = rate % *parent_rate; + div_frc *= BIT(16) - 1; + do_div(div_frc, *parent_rate); + + vc3->div_frc = (u32)div_frc; + rate = (*parent_rate * + (vc3->div_int * VC3_2_POW_16 + div_frc) / VC3_2_POW_16); + } else { + rate = *parent_rate * vc3->div_int; + } + + return rate; +} + +static int vc3_pll_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_pll_data *pll = vc3->data; + u32 val; + + regmap_read(vc3->regmap, pll->int_div_msb_offs, &val); + val = (val & 0xf8) | ((vc3->div_int >> 8) & 0x7); + regmap_write(vc3->regmap, pll->int_div_msb_offs, val); + regmap_write(vc3->regmap, pll->int_div_lsb_offs, vc3->div_int & 0xff); + + if (pll->num == VC3_PLL2) { + regmap_write(vc3->regmap, VC3_PLL2_FB_FRC_DIV_MSB, + vc3->div_frc >> 8); + regmap_write(vc3->regmap, VC3_PLL2_FB_FRC_DIV_LSB, + vc3->div_frc & 0xff); + } + + return 0; +} + +static const struct clk_ops vc3_pll_ops = { + .recalc_rate = vc3_pll_recalc_rate, + .round_rate = vc3_pll_round_rate, + .set_rate = vc3_pll_set_rate, +}; + +static unsigned char vc3_div_mux_get_parent(struct clk_hw *hw) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_clk_data *div_mux = vc3->data; + u32 src; + + regmap_read(vc3->regmap, div_mux->offs, &src); + + return !!(src & div_mux->bitmsk); +} + +static int vc3_div_mux_set_parent(struct clk_hw *hw, u8 index) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_clk_data *div_mux = vc3->data; + + regmap_update_bits(vc3->regmap, div_mux->offs, div_mux->bitmsk, + index ? div_mux->bitmsk : 0); + + return 0; +} + +static const struct clk_ops vc3_div_mux_ops = { + .determine_rate = __clk_mux_determine_rate, + .set_parent = vc3_div_mux_set_parent, + .get_parent = vc3_div_mux_get_parent, +}; + +static unsigned int vc3_get_div(const struct clk_div_table *table, + unsigned int val, unsigned long flag) +{ + const struct clk_div_table *clkt; + + for (clkt = table; clkt->div; clkt++) + if (clkt->val == val) + return clkt->div; + + return 0; +} + +static unsigned long vc3_div_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_div_data *div_data = vc3->data; + unsigned int val; + + regmap_read(vc3->regmap, div_data->offs, &val); + val >>= div_data->shift; + val &= VC3_DIV_MASK(div_data->width); + + return divider_recalc_rate(hw, parent_rate, val, div_data->table, + div_data->flags, div_data->width); +} + +static long vc3_div_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_div_data *div_data = vc3->data; + unsigned int bestdiv; + + /* if read only, just return current value */ + if (div_data->flags & CLK_DIVIDER_READ_ONLY) { + regmap_read(vc3->regmap, div_data->offs, &bestdiv); + bestdiv >>= div_data->shift; + bestdiv &= VC3_DIV_MASK(div_data->width); + bestdiv = vc3_get_div(div_data->table, bestdiv, div_data->flags); + return DIV_ROUND_UP(*parent_rate, bestdiv); + } + + return divider_round_rate(hw, rate, parent_rate, div_data->table, + div_data->width, div_data->flags); +} + +static int vc3_div_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_div_data *div_data = vc3->data; + unsigned int value; + + value = divider_get_val(rate, parent_rate, div_data->table, + div_data->width, div_data->flags); + regmap_update_bits(vc3->regmap, div_data->offs, + VC3_DIV_MASK(div_data->width) << div_data->shift, + value << div_data->shift); + return 0; +} + +static const struct clk_ops vc3_div_ops = { + .recalc_rate = vc3_div_recalc_rate, + .round_rate = vc3_div_round_rate, + .set_rate = vc3_div_set_rate, +}; + +static int vc3_clk_mux_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + int ret; + int frc; + + ret = clk_mux_determine_rate_flags(hw, req, CLK_SET_RATE_PARENT); + if (ret) { + /* The below check is equivalent to (best_parent_rate/rate) */ + if (req->best_parent_rate >= req->rate) { + frc = DIV_ROUND_CLOSEST_ULL(req->best_parent_rate, + req->rate); + req->rate *= frc; + return clk_mux_determine_rate_flags(hw, req, + CLK_SET_RATE_PARENT); + } + ret = 0; + } + + return ret; +} + +static unsigned char vc3_clk_mux_get_parent(struct clk_hw *hw) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_clk_data *clk_mux = vc3->data; + u32 val; + + regmap_read(vc3->regmap, clk_mux->offs, &val); + + return !!(val & clk_mux->bitmsk); +} + +static int vc3_clk_mux_set_parent(struct clk_hw *hw, u8 index) +{ + struct vc3_hw_data *vc3 = container_of(hw, struct vc3_hw_data, hw); + const struct vc3_clk_data *clk_mux = vc3->data; + + regmap_update_bits(vc3->regmap, clk_mux->offs, + clk_mux->bitmsk, index ? clk_mux->bitmsk : 0); + return 0; +} + +static const struct clk_ops vc3_clk_mux_ops = { + .determine_rate = vc3_clk_mux_determine_rate, + .set_parent = vc3_clk_mux_set_parent, + .get_parent = vc3_clk_mux_get_parent, +}; + +static bool vc3_regmap_is_writeable(struct device *dev, unsigned int reg) +{ + return true; +} + +static const struct regmap_config vc3_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .cache_type = REGCACHE_RBTREE, + .max_register = 0x24, + .writeable_reg = vc3_regmap_is_writeable, +}; + +static struct vc3_hw_data clk_div[5]; + +static const struct clk_parent_data pfd_mux_parent_data[] = { + { .index = 0, }, + { .hw = &clk_div[VC3_DIV2].hw } +}; + +static struct vc3_hw_data clk_pfd_mux[] = { + [VC3_PFD2_MUX] = { + .data = &(struct vc3_clk_data) { + .offs = VC3_PLL_OP_CTRL, + .bitmsk = BIT(VC3_PLL_OP_CTRL_PLL2_REFIN_SEL) + }, + .hw.init = &(struct clk_init_data){ + .name = "pfd2_mux", + .ops = &vc3_pfd_mux_ops, + .parent_data = pfd_mux_parent_data, + .num_parents = 2, + .flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT + } + }, + [VC3_PFD3_MUX] = { + .data = &(struct vc3_clk_data) { + .offs = VC3_GENERAL_CTR, + .bitmsk = BIT(VC3_GENERAL_CTR_PLL3_REFIN_SEL) + }, + .hw.init = &(struct clk_init_data){ + .name = "pfd3_mux", + .ops = &vc3_pfd_mux_ops, + .parent_data = pfd_mux_parent_data, + .num_parents = 2, + .flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT + } + } +}; + +static struct vc3_hw_data clk_pfd[] = { + [VC3_PFD1] = { + .data = &(struct vc3_pfd_data) { + .num = VC3_PFD1, + .offs = VC3_PLL1_M_DIVIDER, + .mdiv1_bitmsk = VC3_PLL1_M_DIV1, + .mdiv2_bitmsk = VC3_PLL1_M_DIV2 + }, + .hw.init = &(struct clk_init_data){ + .name = "pfd1", + .ops = &vc3_pfd_ops, + .parent_data = &(const struct clk_parent_data) { + .index = 0 + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT + } + }, + [VC3_PFD2] = { + .data = &(struct vc3_pfd_data) { + .num = VC3_PFD2, + .offs = VC3_PLL2_M_DIVIDER, + .mdiv1_bitmsk = VC3_PLL2_M_DIV1, + .mdiv2_bitmsk = VC3_PLL2_M_DIV2 + }, + .hw.init = &(struct clk_init_data){ + .name = "pfd2", + .ops = &vc3_pfd_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_pfd_mux[VC3_PFD2_MUX].hw + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT + } + }, + [VC3_PFD3] = { + .data = &(struct vc3_pfd_data) { + .num = VC3_PFD3, + .offs = VC3_PLL3_M_DIVIDER, + .mdiv1_bitmsk = VC3_PLL3_M_DIV1, + .mdiv2_bitmsk = VC3_PLL3_M_DIV2 + }, + .hw.init = &(struct clk_init_data){ + .name = "pfd3", + .ops = &vc3_pfd_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_pfd_mux[VC3_PFD3_MUX].hw + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT + } + } +}; + +static struct vc3_hw_data clk_pll[] = { + [VC3_PLL1] = { + .data = &(struct vc3_pll_data) { + .num = VC3_PLL1, + .int_div_msb_offs = VC3_PLL1_LOOP_FILTER_N_DIV_MSB, + .int_div_lsb_offs = VC3_PLL1_VCO_N_DIVIDER, + .vco_min = VC3_PLL1_VCO_MIN, + .vco_max = VC3_PLL1_VCO_MAX + }, + .hw.init = &(struct clk_init_data){ + .name = "pll1", + .ops = &vc3_pll_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_pfd[VC3_PFD1].hw + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT + } + }, + [VC3_PLL2] = { + .data = &(struct vc3_pll_data) { + .num = VC3_PLL2, + .int_div_msb_offs = VC3_PLL2_FB_INT_DIV_MSB, + .int_div_lsb_offs = VC3_PLL2_FB_INT_DIV_LSB, + .vco_min = VC3_PLL2_VCO_MIN, + .vco_max = VC3_PLL2_VCO_MAX + }, + .hw.init = &(struct clk_init_data){ + .name = "pll2", + .ops = &vc3_pll_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_pfd[VC3_PFD2].hw + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT + } + }, + [VC3_PLL3] = { + .data = &(struct vc3_pll_data) { + .num = VC3_PLL3, + .int_div_msb_offs = VC3_PLL3_LOOP_FILTER_N_DIV_MSB, + .int_div_lsb_offs = VC3_PLL3_N_DIVIDER, + .vco_min = VC3_PLL3_VCO_MIN, + .vco_max = VC3_PLL3_VCO_MAX + }, + .hw.init = &(struct clk_init_data){ + .name = "pll3", + .ops = &vc3_pll_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_pfd[VC3_PFD3].hw + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT + } + } +}; + +static const struct clk_parent_data div_mux_parent_data[][2] = { + [VC3_DIV1_MUX] = { + { .hw = &clk_pll[VC3_PLL1].hw }, + { .index = 0 } + }, + [VC3_DIV3_MUX] = { + { .hw = &clk_pll[VC3_PLL2].hw }, + { .hw = &clk_pll[VC3_PLL3].hw } + }, + [VC3_DIV4_MUX] = { + { .hw = &clk_pll[VC3_PLL2].hw }, + { .index = 0 } + } +}; + +static struct vc3_hw_data clk_div_mux[] = { + [VC3_DIV1_MUX] = { + .data = &(struct vc3_clk_data) { + .offs = VC3_GENERAL_CTR, + .bitmsk = VC3_GENERAL_CTR_DIV1_SRC_SEL + }, + .hw.init = &(struct clk_init_data){ + .name = "div1_mux", + .ops = &vc3_div_mux_ops, + .parent_data = div_mux_parent_data[VC3_DIV1_MUX], + .num_parents = 2, + .flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT + } + }, + [VC3_DIV3_MUX] = { + .data = &(struct vc3_clk_data) { + .offs = VC3_PLL3_CHARGE_PUMP_CTRL, + .bitmsk = VC3_PLL3_CHARGE_PUMP_CTRL_OUTDIV3_SRC_SEL + }, + .hw.init = &(struct clk_init_data){ + .name = "div3_mux", + .ops = &vc3_div_mux_ops, + .parent_data = div_mux_parent_data[VC3_DIV3_MUX], + .num_parents = 2, + .flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT + } + }, + [VC3_DIV4_MUX] = { + .data = &(struct vc3_clk_data) { + .offs = VC3_OUTPUT_CTR, + .bitmsk = VC3_OUTPUT_CTR_DIV4_SRC_SEL + }, + .hw.init = &(struct clk_init_data){ + .name = "div4_mux", + .ops = &vc3_div_mux_ops, + .parent_data = div_mux_parent_data[VC3_DIV4_MUX], + .num_parents = 2, + .flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT + } + } +}; + +static struct vc3_hw_data clk_div[] = { + [VC3_DIV1] = { + .data = &(struct vc3_div_data) { + .offs = VC3_OUT_DIV1_DIV2_CTRL, + .table = div1_divs, + .shift = 4, + .width = 4, + .flags = CLK_DIVIDER_READ_ONLY + }, + .hw.init = &(struct clk_init_data){ + .name = "div1", + .ops = &vc3_div_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_div_mux[VC3_DIV1_MUX].hw + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT + } + }, + [VC3_DIV2] = { + .data = &(struct vc3_div_data) { + .offs = VC3_OUT_DIV1_DIV2_CTRL, + .table = div245_divs, + .shift = 0, + .width = 4, + .flags = CLK_DIVIDER_READ_ONLY + }, + .hw.init = &(struct clk_init_data){ + .name = "div2", + .ops = &vc3_div_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_pll[VC3_PLL1].hw + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT + } + }, + [VC3_DIV3] = { + .data = &(struct vc3_div_data) { + .offs = VC3_OUT_DIV3_DIV4_CTRL, + .table = div3_divs, + .shift = 4, + .width = 4, + .flags = CLK_DIVIDER_READ_ONLY + }, + .hw.init = &(struct clk_init_data){ + .name = "div3", + .ops = &vc3_div_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_div_mux[VC3_DIV3_MUX].hw + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT + } + }, + [VC3_DIV4] = { + .data = &(struct vc3_div_data) { + .offs = VC3_OUT_DIV3_DIV4_CTRL, + .table = div245_divs, + .shift = 0, + .width = 4, + .flags = CLK_DIVIDER_READ_ONLY + }, + .hw.init = &(struct clk_init_data){ + .name = "div4", + .ops = &vc3_div_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_div_mux[VC3_DIV4_MUX].hw + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT + } + }, + [VC3_DIV5] = { + .data = &(struct vc3_div_data) { + .offs = VC3_PLL1_CTRL_OUTDIV5, + .table = div245_divs, + .shift = 0, + .width = 4, + .flags = CLK_DIVIDER_READ_ONLY + }, + .hw.init = &(struct clk_init_data){ + .name = "div5", + .ops = &vc3_div_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_pll[VC3_PLL3].hw + }, + .num_parents = 1, + .flags = CLK_SET_RATE_PARENT + } + } +}; + +static struct vc3_hw_data clk_mux[] = { + [VC3_DIFF2_MUX] = { + .data = &(struct vc3_clk_data) { + .offs = VC3_DIFF2_CTRL_REG, + .bitmsk = VC3_DIFF2_CTRL_REG_DIFF2_CLK_SEL + }, + .hw.init = &(struct clk_init_data){ + .name = "diff2_mux", + .ops = &vc3_clk_mux_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_div[VC3_DIV1].hw, + &clk_div[VC3_DIV3].hw + }, + .num_parents = 2, + .flags = CLK_SET_RATE_PARENT + } + }, + [VC3_DIFF1_MUX] = { + .data = &(struct vc3_clk_data) { + .offs = VC3_DIFF1_CTRL_REG, + .bitmsk = VC3_DIFF1_CTRL_REG_DIFF1_CLK_SEL + }, + .hw.init = &(struct clk_init_data){ + .name = "diff1_mux", + .ops = &vc3_clk_mux_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_div[VC3_DIV1].hw, + &clk_div[VC3_DIV3].hw + }, + .num_parents = 2, + .flags = CLK_SET_RATE_PARENT + } + }, + [VC3_SE3_MUX] = { + .data = &(struct vc3_clk_data) { + .offs = VC3_SE3_DIFF1_CTRL_REG, + .bitmsk = VC3_SE3_DIFF1_CTRL_REG_SE3_CLK_SEL + }, + .hw.init = &(struct clk_init_data){ + .name = "se3_mux", + .ops = &vc3_clk_mux_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_div[VC3_DIV2].hw, + &clk_div[VC3_DIV4].hw + }, + .num_parents = 2, + .flags = CLK_SET_RATE_PARENT + } + }, + [VC3_SE2_MUX] = { + .data = &(struct vc3_clk_data) { + .offs = VC3_SE2_CTRL_REG0, + .bitmsk = VC3_SE2_CTRL_REG0_SE2_CLK_SEL + }, + .hw.init = &(struct clk_init_data){ + .name = "se2_mux", + .ops = &vc3_clk_mux_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_div[VC3_DIV5].hw, + &clk_div[VC3_DIV4].hw + }, + .num_parents = 2, + .flags = CLK_SET_RATE_PARENT + } + }, + [VC3_SE1_MUX] = { + .data = &(struct vc3_clk_data) { + .offs = VC3_SE1_DIV4_CTRL, + .bitmsk = VC3_SE1_DIV4_CTRL_SE1_CLK_SEL + }, + .hw.init = &(struct clk_init_data){ + .name = "se1_mux", + .ops = &vc3_clk_mux_ops, + .parent_hws = (const struct clk_hw *[]) { + &clk_div[VC3_DIV5].hw, + &clk_div[VC3_DIV4].hw + }, + .num_parents = 2, + .flags = CLK_SET_RATE_PARENT + } + } +}; + +static struct clk_hw *vc3_of_clk_get(struct of_phandle_args *clkspec, + void *data) +{ + unsigned int idx = clkspec->args[0]; + struct clk_hw **clkout_hw = data; + + if (idx >= ARRAY_SIZE(clk_out)) { + pr_err("invalid clk index %u for provider %pOF\n", idx, clkspec->np); + return ERR_PTR(-EINVAL); + } + + return clkout_hw[idx]; +} + +static int vc3_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + u8 settings[NUM_CONFIG_REGISTERS]; + struct regmap *regmap; + const char *name; + int ret, i; + + regmap = devm_regmap_init_i2c(client, &vc3_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(dev, PTR_ERR(regmap), + "failed to allocate register map\n"); + + ret = of_property_read_u8_array(dev->of_node, "renesas,settings", + settings, ARRAY_SIZE(settings)); + if (!ret) { + /* + * A raw settings array was specified in the DT. Write the + * settings to the device immediately. + */ + for (i = 0; i < NUM_CONFIG_REGISTERS; i++) { + ret = regmap_write(regmap, i, settings[i]); + if (ret) { + dev_err(dev, "error writing to chip (%i)\n", ret); + return ret; + } + } + } else if (ret == -EOVERFLOW) { + dev_err(&client->dev, "EOVERFLOW reg settings. ARRAY_SIZE: %zu", + ARRAY_SIZE(settings)); + return ret; + } + + /* Register pfd muxes */ + for (i = 0; i < ARRAY_SIZE(clk_pfd_mux); i++) { + clk_pfd_mux[i].regmap = regmap; + ret = devm_clk_hw_register(dev, &clk_pfd_mux[i].hw); + if (ret) + return dev_err_probe(dev, ret, "%s failed\n", + clk_pfd_mux[i].hw.init->name); + } + + /* Register pfd's */ + for (i = 0; i < ARRAY_SIZE(clk_pfd); i++) { + clk_pfd[i].regmap = regmap; + ret = devm_clk_hw_register(dev, &clk_pfd[i].hw); + if (ret) + return dev_err_probe(dev, ret, "%s failed\n", + clk_pfd[i].hw.init->name); + } + + /* Register pll's */ + for (i = 0; i < ARRAY_SIZE(clk_pll); i++) { + clk_pll[i].regmap = regmap; + ret = devm_clk_hw_register(dev, &clk_pll[i].hw); + if (ret) + return dev_err_probe(dev, ret, "%s failed\n", + clk_pll[i].hw.init->name); + } + + /* Register divider muxes */ + for (i = 0; i < ARRAY_SIZE(clk_div_mux); i++) { + clk_div_mux[i].regmap = regmap; + ret = devm_clk_hw_register(dev, &clk_div_mux[i].hw); + if (ret) + return dev_err_probe(dev, ret, "%s failed\n", + clk_div_mux[i].hw.init->name); + } + + /* Register dividers */ + for (i = 0; i < ARRAY_SIZE(clk_div); i++) { + clk_div[i].regmap = regmap; + ret = devm_clk_hw_register(dev, &clk_div[i].hw); + if (ret) + return dev_err_probe(dev, ret, "%s failed\n", + clk_div[i].hw.init->name); + } + + /* Register clk muxes */ + for (i = 0; i < ARRAY_SIZE(clk_mux); i++) { + clk_mux[i].regmap = regmap; + ret = devm_clk_hw_register(dev, &clk_mux[i].hw); + if (ret) + return dev_err_probe(dev, ret, "%s failed\n", + clk_mux[i].hw.init->name); + } + + /* Register clk outputs */ + for (i = 0; i < ARRAY_SIZE(clk_out); i++) { + switch (i) { + case VC3_DIFF2: + name = "diff2"; + break; + case VC3_DIFF1: + name = "diff1"; + break; + case VC3_SE3: + name = "se3"; + break; + case VC3_SE2: + name = "se2"; + break; + case VC3_SE1: + name = "se1"; + break; + case VC3_REF: + name = "ref"; + break; + default: + pr_err("invalid clk output %d\n", i); + return -EINVAL; + } + + if (i == VC3_REF) + clk_out[i] = devm_clk_hw_register_fixed_factor_index(dev, + name, 0, CLK_SET_RATE_PARENT, 1, 1); + else + clk_out[i] = devm_clk_hw_register_fixed_factor_parent_hw(dev, + name, &clk_mux[i].hw, CLK_SET_RATE_PARENT, 1, 1); + + if (IS_ERR(clk_out[i])) + return PTR_ERR(clk_out[i]); + } + + ret = devm_of_clk_add_hw_provider(dev, vc3_of_clk_get, clk_out); + if (ret) + return dev_err_probe(dev, ret, "unable to add clk provider\n"); + + return ret; +} + +static const struct of_device_id dev_ids[] = { + { .compatible = "renesas,5p35023" }, + { /* Sentinel */ } +}; +MODULE_DEVICE_TABLE(of, dev_ids); + +static struct i2c_driver vc3_driver = { + .driver = { + .name = "vc3", + .of_match_table = of_match_ptr(dev_ids), + }, + .probe_new = vc3_probe, +}; +module_i2c_driver(vc3_driver); + +MODULE_AUTHOR("Biju Das "); +MODULE_DESCRIPTION("Renesas VersaClock 3 driver"); +MODULE_LICENSE("GPL");