From patchwork Mon Apr 7 10:28:18 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Nuno_S=C3=A1?= X-Patchwork-Id: 14040173 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 864232309AD; Mon, 7 Apr 2025 10:28:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744021699; cv=none; b=DR0oH/xampBpYiS6QlCJOEplp3L8jpCrKTRwLyEV6cIG2hkCzu59NNUpcd58CMhrpTEzDazE0nEQWhFp6WYeJsn57b0V+E0Mp3wY8mGv3qB/plj59RK95SEKTBNp+esLzpZ/0JZHziptGFAW1JZPm6Ju1ioh0wxwoysQUGWBxTw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744021699; c=relaxed/simple; bh=Iq+d8+KNth2nrBHa0/Mo3Pmi8HpSU+Mwsq7ExAcOZMk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ZQ1sjvw3uk8BgX0sFDBkz+MMxgUqQ8bOdx8Qbgn9gRuSfE8hItjG2a3QyMavQRSkHRfFjV3K2r+mKvDPaDvYirVouCqWyXwAPHOzJ9nH1o0QOOCPQIgKrCy+jJ99a5UZAtz20KU90ylnzwTgIg2LA/0v/tp8RYrZJ7fS8M11sHQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=J6YkbIKY; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="J6YkbIKY" Received: by smtp.kernel.org (Postfix) with ESMTPS id 3B3EAC4CEF0; Mon, 7 Apr 2025 10:28:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744021699; bh=Iq+d8+KNth2nrBHa0/Mo3Pmi8HpSU+Mwsq7ExAcOZMk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=J6YkbIKYYYu945x2MS5NvgNokyXFBLxmx2vdiCPetohwEI4sOtETdischc+tFxVVX 4UNDzhhLRPUqsU2bBmOhihCVkBXok+K3FOocBqtXcyfm2517J3z7w9tyX0wiB3tiuL PStdsXvMcVIvBvkJxne9AOvNHTHW2aUQiiUMKqM9uuuNIXWSHmSZUTFqZRFN6j32iv KXcpl4XP7N+i3VLUaWrQSvVc5knCsL7ccKgDLvO15DLvH1LCFvc421JUQ901esYlNz 6OcnNOE3Cv9yVfxaUJY56N8saadxX0ZZxQutQVCwXkvvOnn3SLgh+/5wbR8XGfBjUy hLFCcU6MoTNaA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 31642C369A2; Mon, 7 Apr 2025 10:28:19 +0000 (UTC) Date: Mon, 07 Apr 2025 11:28:18 +0100 Subject: [PATCH v3 4/6] clk: clk-axi-clkgen: detect axi_clkgen_limits at runtime Precedence: bulk X-Mailing-List: linux-fpga@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250407-dev-axi-clkgen-limits-v3-4-33c7f27c9d69@analog.com> References: <20250407-dev-axi-clkgen-limits-v3-0-33c7f27c9d69@analog.com> In-Reply-To: <20250407-dev-axi-clkgen-limits-v3-0-33c7f27c9d69@analog.com> To: linux-clk@vger.kernel.org, linux-fpga@vger.kernel.org Cc: Stephen Boyd , Michael Turquette , Moritz Fischer , Wu Hao , Xu Yilun , Tom Rix X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1744021699; l=3698; i=nuno.sa@analog.com; s=20231116; h=from:subject:message-id; bh=iBmfD8SeeesocRGR7ow2MXwCfnSXtfBsCbwFv9xpXxk=; b=K01RSyoiK8pVy3wGTN0J2DCVAYKrP31FAHvA97wxGn2ecEfqv61/tIs2W3V91hKmYouKAFE2X xlzdruBuBYmALjm/q+9xW4cZ0zwVl6288k3pgONx3M7wrcdJEOhAjg1 X-Developer-Key: i=nuno.sa@analog.com; a=ed25519; pk=3NQwYA013OUYZsmDFBf8rmyyr5iQlxV/9H4/Df83o1E= X-Endpoint-Received: by B4 Relay for nuno.sa@analog.com/20231116 with auth_id=100 X-Original-From: =?utf-8?q?Nuno_S=C3=A1?= Reply-To: nuno.sa@analog.com From: =?utf-8?q?Nuno_S=C3=A1?= From: Nuno Sá This patch adds support for setting the limits in struct axi_clkgen_limits in accordance with fpga speed grade, voltage, technology and family. This new information is extracted from two new registers implemented in the ip core that are only available for core versions higher or equal to 4. Signed-off-by: Nuno Sá --- drivers/clk/clk-axi-clkgen.c | 62 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 61 insertions(+), 1 deletion(-) diff --git a/drivers/clk/clk-axi-clkgen.c b/drivers/clk/clk-axi-clkgen.c index 2a95f9b220234a1245024a821c50e1eb9c104ac9..8c270ba7626bc24c4385615b7aa08ee95e198881 100644 --- a/drivers/clk/clk-axi-clkgen.c +++ b/drivers/clk/clk-axi-clkgen.c @@ -16,6 +16,8 @@ #include #include +#include + #define AXI_CLKGEN_V2_REG_RESET 0x40 #define AXI_CLKGEN_V2_REG_CLKSEL 0x44 #define AXI_CLKGEN_V2_REG_DRP_CNTRL 0x70 @@ -497,6 +499,54 @@ static u8 axi_clkgen_get_parent(struct clk_hw *clk_hw) return parent; } +static int axi_clkgen_setup_limits(struct axi_clkgen *axi_clkgen, + struct device *dev) +{ + unsigned int tech, family, speed_grade, reg_value; + + axi_clkgen_read(axi_clkgen, ADI_AXI_REG_FPGA_INFO, ®_value); + tech = ADI_AXI_INFO_FPGA_TECH(reg_value); + family = ADI_AXI_INFO_FPGA_FAMILY(reg_value); + speed_grade = ADI_AXI_INFO_FPGA_SPEED_GRADE(reg_value); + + axi_clkgen->limits.fpfd_min = 10000; + axi_clkgen->limits.fvco_min = 600000; + + switch (speed_grade) { + case ADI_AXI_FPGA_SPEED_1 ... ADI_AXI_FPGA_SPEED_1LV: + axi_clkgen->limits.fvco_max = 1200000; + axi_clkgen->limits.fpfd_max = 450000; + break; + case ADI_AXI_FPGA_SPEED_2 ... ADI_AXI_FPGA_SPEED_2LV: + axi_clkgen->limits.fvco_max = 1440000; + axi_clkgen->limits.fpfd_max = 500000; + if (family == ADI_AXI_FPGA_FAMILY_KINTEX || family == ADI_AXI_FPGA_FAMILY_ARTIX) { + axi_clkgen_read(axi_clkgen, ADI_AXI_REG_FPGA_VOLTAGE, + ®_value); + if (ADI_AXI_INFO_FPGA_VOLTAGE(reg_value) < 950) { + axi_clkgen->limits.fvco_max = 1200000; + axi_clkgen->limits.fpfd_max = 450000; + } + } + break; + case ADI_AXI_FPGA_SPEED_3: + axi_clkgen->limits.fvco_max = 1600000; + axi_clkgen->limits.fpfd_max = 550000; + break; + default: + return dev_err_probe(dev, -ENODEV, "Unknown speed grade %d\n", + speed_grade); + }; + + /* Overwrite vco limits for ultrascale+ */ + if (tech == ADI_AXI_FPGA_TECH_ULTRASCALE_PLUS) { + axi_clkgen->limits.fvco_max = 1600000; + axi_clkgen->limits.fvco_min = 800000; + } + + return 0; +} + static const struct clk_ops axi_clkgen_ops = { .recalc_rate = axi_clkgen_recalc_rate, .determine_rate = axi_clkgen_determine_rate, @@ -511,6 +561,7 @@ static int axi_clkgen_probe(struct platform_device *pdev) { const struct axi_clkgen_limits *dflt_limits; struct axi_clkgen *axi_clkgen; + unsigned int pcore_version; struct clk_init_data init; const char *parent_names[2]; const char *clk_name; @@ -556,7 +607,16 @@ static int axi_clkgen_probe(struct platform_device *pdev) return -EINVAL; } - memcpy(&axi_clkgen->limits, dflt_limits, sizeof(axi_clkgen->limits)); + axi_clkgen_read(axi_clkgen, ADI_AXI_REG_VERSION, &pcore_version); + + if (ADI_AXI_PCORE_VER_MAJOR(pcore_version) > 0x04) { + ret = axi_clkgen_setup_limits(axi_clkgen, &pdev->dev); + if (ret) + return ret; + } else { + memcpy(&axi_clkgen->limits, dflt_limits, + sizeof(axi_clkgen->limits)); + } clk_name = pdev->dev.of_node->name; of_property_read_string(pdev->dev.of_node, "clock-output-names",