From patchwork Mon Dec 18 17:14:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Th=C3=A9o_Lebrun?= X-Patchwork-Id: 755584 Received: from relay8-d.mail.gandi.net (relay8-d.mail.gandi.net [217.70.183.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A75975A84B; Mon, 18 Dec 2023 17:14:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="jwhL4RJf" Received: by mail.gandi.net (Postfix) with ESMTPSA id 34B1B1BF204; Mon, 18 Dec 2023 17:14:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1702919667; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=d0UEeHOIXuUz8Ts9qVxo2azVj8UAi0Ell/BQbvhIeVw=; b=jwhL4RJfnwbK7ag4+k4WLiVZE+4srTINdHkjBhJ1G9XY/qPY5ZiJ4qMJRCcR7mH6JPDAe6 HtdLE0SzoyZaa7wCj47LTtTGNZND4bDG1T5Q2/DPWYNhJPiktRI+7HjNqnXDcmIbtmMz9l luEIFs96/IW+dCFgVS2GEe3e93uHCTkp9gnee6JvrPU1cW2EFzQGEMQ+UxzsHiKBXF0FQL NcGVm+HH3oMEEII6xp3DLOZ1vof+MT8sZUCcavB8H2rBdTmF38IJEOxtzuEzvBx9nEfiKW G9pC037H822BcEaTAgCzOZo7jnmZXVTySxG39GTNq4r2Y8+4s82uIJWlawD4hw== From: =?utf-8?q?Th=C3=A9o_Lebrun?= Date: Mon, 18 Dec 2023 18:14:19 +0100 Subject: [PATCH 4/5] clk: eyeq5: add OSPI table-based divider clock Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231218-mbly-clk-v1-4-44ce54108f06@bootlin.com> References: <20231218-mbly-clk-v1-0-44ce54108f06@bootlin.com> In-Reply-To: <20231218-mbly-clk-v1-0-44ce54108f06@bootlin.com> To: Gregory CLEMENT , Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thomas Bogendoerfer Cc: Vladimir Kondratiev , linux-mips@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Thomas Petazzoni , Tawfik Bayouk , =?utf-8?q?Th=C3=A9o_Lebrun?= X-Mailer: b4 0.12.4 X-GND-Sasl: theo.lebrun@bootlin.com The driver supports PLLs on the platform. Add the single divider clock of the platform. Helpers from include/linux/clk-provider.h could have been used if it was not for the use of regmap to access the register. Signed-off-by: Théo Lebrun --- drivers/clk/Kconfig | 2 +- drivers/clk/clk-eyeq5.c | 143 ++++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 140 insertions(+), 5 deletions(-) diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 84fe0a89b8df..63cc354f41ab 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -227,7 +227,7 @@ config COMMON_CLK_EYEQ5 This drivers provides the fixed clocks found on the Mobileye EyeQ5 SoC. Its registers live in a shared register region called OLB. It provides 10 read-only PLLs derived from the main crystal clock which - must be constant. + must be constant and one divider clock based on one PLLs. config COMMON_CLK_FSL_FLEXSPI tristate "Clock driver for FlexSPI on Layerscape SoCs" diff --git a/drivers/clk/clk-eyeq5.c b/drivers/clk/clk-eyeq5.c index 74bcb8cec5c1..3382f4d870d7 100644 --- a/drivers/clk/clk-eyeq5.c +++ b/drivers/clk/clk-eyeq5.c @@ -3,8 +3,9 @@ * PLL clock driver for the Mobileye EyeQ5 platform. * * This controller handles 10 read-only PLLs, all derived from the same main - * crystal clock. The parent clock is expected to be constant. This driver is - * custom to this platform, its registers live in a shared region called OLB. + * crystal clock. It also exposes one divider clock, a child of one of the + * PLLs. The parent clock is expected to be constant. This driver is custom to + * this platform, its registers live in a shared region called OLB. * * We use eq5c_ as prefix, as-in "EyeQ5 Clock", but way shorter. * @@ -77,6 +78,8 @@ static const struct eq5c_pll { [EQ5C_PLL_DDR1] = { .name = "pll-ddr1", .reg = OLB_PCSR_DDR1(0), }, }; +#define EQ5C_OSPI_DIV_CLK_NAME "div-ospi" + static int eq5c_pll_parse_registers(u32 r0, u32 r1, unsigned long *mult, unsigned long *div, unsigned long *acc) { @@ -131,6 +134,128 @@ static int eq5c_pll_parse_registers(u32 r0, u32 r1, unsigned long *mult, return 0; } +#define OLB_OSPI_REG 0x11C +#define OLB_OSPI_DIV_MASK GENMASK(3, 0) +#define OLB_OSPI_DIV_MASK_WIDTH 4 + +static const struct clk_div_table eq5c_ospi_div_table[] = { + { .val = 0, .div = 2 }, + { .val = 1, .div = 4 }, + { .val = 2, .div = 6 }, + { .val = 3, .div = 8 }, + { .val = 4, .div = 10 }, + { .val = 5, .div = 12 }, + { .val = 6, .div = 14 }, + { .val = 7, .div = 16 }, + {} /* sentinel */ +}; + +struct eq5c_ospi_div { + struct clk_hw hw; + struct regmap *olb; +}; + +static struct eq5c_ospi_div *clk_hw_to_ospi_priv(struct clk_hw *hw) +{ + return container_of(hw, struct eq5c_ospi_div, hw); +} + +static unsigned long eq5c_ospi_div_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct eq5c_ospi_div *div = clk_hw_to_ospi_priv(hw); + unsigned int val; + int ret; + + ret = regmap_read(div->olb, OLB_OSPI_REG, &val); + + if (ret) { + pr_err("%s: regmap_read failed: %d\n", __func__, ret); + return 0; + } + + val = FIELD_GET(OLB_OSPI_DIV_MASK, val); + + return divider_recalc_rate(hw, parent_rate, val, + eq5c_ospi_div_table, 0, + OLB_OSPI_DIV_MASK_WIDTH); +} + +static long eq5c_ospi_div_round_rate(struct clk_hw *hw, + unsigned long rate, unsigned long *prate) +{ + return divider_round_rate(hw, rate, prate, eq5c_ospi_div_table, + OLB_OSPI_DIV_MASK_WIDTH, 0); +} + +static int eq5c_ospi_div_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + return divider_determine_rate(hw, req, eq5c_ospi_div_table, + OLB_OSPI_DIV_MASK_WIDTH, 0); +} + +static int eq5c_ospi_div_set_rate(struct clk_hw *hw, + unsigned long rate, unsigned long parent_rate) +{ + struct eq5c_ospi_div *div = clk_hw_to_ospi_priv(hw); + unsigned int val; + int value, ret; + + value = divider_get_val(rate, parent_rate, eq5c_ospi_div_table, + OLB_OSPI_DIV_MASK_WIDTH, 0); + if (value < 0) + return value; + + ret = regmap_read(div->olb, OLB_OSPI_REG, &val); + if (ret) { + pr_err("%s: regmap_read failed: %d\n", __func__, ret); + return -ret; + } + + val &= ~OLB_OSPI_DIV_MASK; + val |= FIELD_PREP(OLB_OSPI_DIV_MASK, value); + + ret = regmap_write(div->olb, OLB_OSPI_REG, val); + if (ret) { + pr_err("%s: regmap_write failed: %d\n", __func__, ret); + return -ret; + } + + return 0; +} + +const struct clk_ops eq5c_ospi_div_ops = { + .recalc_rate = eq5c_ospi_div_recalc_rate, + .round_rate = eq5c_ospi_div_round_rate, + .determine_rate = eq5c_ospi_div_determine_rate, + .set_rate = eq5c_ospi_div_set_rate, +}; + +static struct clk_hw *eq5c_init_ospi_div(const struct clk_hw *parent, + struct regmap *olb) +{ + struct eq5c_ospi_div *div; + int ret; + + div = kzalloc(sizeof(*div), GFP_KERNEL); + if (!div) + return ERR_PTR(-ENOENT); + + div->olb = olb; + div->hw.init = CLK_HW_INIT_HW(EQ5C_OSPI_DIV_CLK_NAME, parent, + &eq5c_ospi_div_ops, 0); + + ret = clk_hw_register(NULL, &div->hw); + if (ret) { + pr_err("failed registering div_ospi: %d\n", ret); + kfree(div); + return ERR_PTR(-ENOENT); + } + + return &div->hw; +} + static void eq5c_init(struct device_node *np) { struct device_node *parent_np = of_get_parent(np); @@ -139,13 +264,15 @@ static void eq5c_init(struct device_node *np) struct clk_hw *parent_clk_hw; struct clk *parent_clk; struct regmap *olb; + size_t nb_clks; int i; - data = kzalloc(struct_size(data, hws, ARRAY_SIZE(eq5c_plls)), GFP_KERNEL); + nb_clks = ARRAY_SIZE(eq5c_plls) + 1; + data = kzalloc(struct_size(data, hws, nb_clks), GFP_KERNEL); if (!data) return; - data->num = ARRAY_SIZE(eq5c_plls); + data->num = nb_clks; /* * TODO: currently, if OLB is not available, we log an error and early @@ -205,6 +332,14 @@ static void eq5c_init(struct device_node *np) } } + /* + * Register the OSPI table-based divider clock manually. This is + * equivalent to drivers/clk/clk-divider.c, but using regmap to access + * its register. + */ + i = ARRAY_SIZE(eq5c_plls); + data->hws[i] = eq5c_init_ospi_div(data->hws[EQ5C_PLL_PER], olb); + of_clk_add_hw_provider(np, of_clk_hw_onecell_get, data); }