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Tue, 23 Apr 2019 22:21:24 -0700 From: Vidya Sagar To: , , , , , , , , , , Subject: [PATCH V5 06/16] PCI: dwc: Add ext config space capability search API Date: Wed, 24 Apr 2019 10:49:54 +0530 Message-ID: <20190424052004.6270-7-vidyas@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190424052004.6270-1-vidyas@nvidia.com> References: <20190424052004.6270-1-vidyas@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1556083261; bh=nwv6D3LhBM3GJgrGNF+Yy78OUg2Wgm+V0DaFe600sFc=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=V4vVCqtEvuUZNf+opA16yiJn7OZAudnPX/LNcsEU12XmPv9avTr8eDVgMePRaVltq kGdGnHuQHBTARwWe6apLNX5Vzrj3gK1oqosfuTwb8V5Hdg6eN7gUejV9C5yC7BhNzo KTE2vuUTFIwm5yQc4Laib3b4YiRQKuxphiS9DZbSbqR7bejiVXPgNO3W6KduA2DJBp krF5OtEKDHErFq4VVV4DqjZ3DKglPc6itmz/D6Jz+XmGj6CHmlLQXAhFbmOIgjvbIj zyhRYXFua101kRs8kzLfoCvI0iyRK6+nUxX3R2zQoRPNCrPWoRjnpMn8LVkc9oxcZA DNLivbe7cTaSw== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190423_222127_754272_3564B64D X-CRM114-Status: GOOD ( 11.52 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, mmaddireddy@nvidia.com, kthota@nvidia.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, mperttunen@nvidia.com, linux-tegra@vger.kernel.org, vidyas@nvidia.com, linux-arm-kernel@lists.infradead.org, sagar.tv@gmail.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add extended configuration space capability search API using struct dw_pcie * pointer Signed-off-by: Vidya Sagar Acked-by: Gustavo Pimentel --- Changes from [v4]: * None Changes from [v3]: * None Changes from [v2]: * None Changes from [v1]: * This is a new patch in v2 series drivers/pci/controller/dwc/pcie-designware.c | 41 ++++++++++++++++++++ drivers/pci/controller/dwc/pcie-designware.h | 1 + 2 files changed, 42 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index ed21e861df82..417ee51ae502 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -59,6 +59,47 @@ u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); } +static int dw_pcie_find_next_ext_capability(struct dw_pcie *pci, int start, + int cap) +{ + u32 header; + int ttl; + int pos = PCI_CFG_SPACE_SIZE; + + /* minimum 8 bytes per capability */ + ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; + + if (start) + pos = start; + + header = dw_pcie_readl_dbi(pci, pos); + /* + * If we have no capabilities, this is indicated by cap ID, + * cap version and next pointer all being 0. + */ + if (header == 0) + return 0; + + while (ttl-- > 0) { + if (PCI_EXT_CAP_ID(header) == cap && pos != start) + return pos; + + pos = PCI_EXT_CAP_NEXT(header); + if (pos < PCI_CFG_SPACE_SIZE) + break; + + header = dw_pcie_readl_dbi(pci, pos); + } + + return 0; +} + +int dw_pcie_find_ext_capability(struct dw_pcie *pci, int cap) +{ + return dw_pcie_find_next_ext_capability(pci, 0, cap); +} +EXPORT_SYMBOL_GPL(dw_pcie_find_ext_capability); + int dw_pcie_read(void __iomem *addr, int size, u32 *val) { if (!IS_ALIGNED((uintptr_t)addr, size)) { diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 35160b4ce929..67307842e003 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -249,6 +249,7 @@ struct dw_pcie { container_of((endpoint), struct dw_pcie, ep) u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap); +int dw_pcie_find_ext_capability(struct dw_pcie *pci, int cap); int dw_pcie_read(void __iomem *addr, int size, u32 *val); int dw_pcie_write(void __iomem *addr, int size, u32 val);