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Mon, 15 Jul 2024 07:09:55 -0500 Received: from lelvsmtp5.itg.ti.com (10.180.75.250) by DFLE114.ent.ti.com (10.64.6.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23 via Frontend Transport; Mon, 15 Jul 2024 07:09:55 -0500 Received: from uda0492258.dhcp.ti.com (uda0492258.dhcp.ti.com [10.24.72.81]) by lelvsmtp5.itg.ti.com (8.15.2/8.15.2) with ESMTP id 46FC9anY060344; Mon, 15 Jul 2024 07:09:51 -0500 From: Siddharth Vadapalli To: , , , , , , , , CC: , , , , , Subject: [PATCH 3/3] PCI: j721e: Add support for enabling ACSPCIE PAD IO Buffer output Date: Mon, 15 Jul 2024 17:39:36 +0530 Message-ID: <20240715120936.1150314-4-s-vadapalli@ti.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240715120936.1150314-1-s-vadapalli@ti.com> References: <20240715120936.1150314-1-s-vadapalli@ti.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 The ACSPCIE module is capable of driving the reference clock required by the PCIe Endpoint device. It is an alternative to on-board and external reference clock generators. Enabling the output from the ACSPCIE module's PAD IO Buffers requires clearing the "PAD IO disable" bits of the ACSPCIE_PROXY_CTRL register in the CTRL_MMR register space. Signed-off-by: Siddharth Vadapalli --- drivers/pci/controller/cadence/pci-j721e.c | 33 ++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index 85718246016b..2fa0eff68a8a 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -44,6 +44,7 @@ enum link_status { #define J721E_MODE_RC BIT(7) #define LANE_COUNT(n) ((n) << 8) +#define ACSPCIE_PAD_ENABLE_MASK GENMASK(1, 0) #define GENERATION_SEL_MASK GENMASK(1, 0) struct j721e_pcie { @@ -220,6 +221,30 @@ static int j721e_pcie_set_lane_count(struct j721e_pcie *pcie, return ret; } +static int j721e_acspcie_pad_enable(struct j721e_pcie *pcie, struct regmap *syscon) +{ + struct device *dev = pcie->cdns_pcie->dev; + struct device_node *node = dev->of_node; + u32 mask = ACSPCIE_PAD_ENABLE_MASK; + struct of_phandle_args args; + u32 val; + int ret; + + ret = of_parse_phandle_with_fixed_args(node, "ti,syscon-acspcie-proxy-ctrl", + 1, 0, &args); + if (!ret) { + /* PAD Enable Bits have to be cleared to in order to enable output */ + val = ~(args.args[0]); + ret = regmap_update_bits(syscon, 0, mask, val); + if (ret) + dev_err(dev, "Enabling ACSPCIE PAD output failed: %d\n", ret); + } else { + dev_err(dev, "ti,syscon-acspcie-proxy-ctrl has invalid parameters\n"); + } + + return ret; +} + static int j721e_pcie_ctrl_init(struct j721e_pcie *pcie) { struct device *dev = pcie->cdns_pcie->dev; @@ -259,6 +284,14 @@ static int j721e_pcie_ctrl_init(struct j721e_pcie *pcie) return ret; } + /* Enable ACSPCIe PAD IO Buffers if the optional property exists */ + syscon = syscon_regmap_lookup_by_phandle_optional(node, "ti,syscon-acspcie-proxy-ctrl"); + if (syscon) { + ret = j721e_acspcie_pad_enable(pcie, syscon); + if (ret) + return ret; + } + return 0; }