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Mon, 01 Jul 2019 05:40:53 -0700 From: Vidya Sagar To: , , , , , , , , , , Subject: [PATCH V12 05/12] PCI: dwc: Add ext config space capability search API Date: Mon, 1 Jul 2019 18:10:03 +0530 Message-ID: <20190701124010.7484-6-vidyas@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190701124010.7484-1-vidyas@nvidia.com> References: <20190701124010.7484-1-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=1561984857; bh=dIaZ1ynlaEypdztl5pyXgen370gLmT2BpPK4ZLYuXDo=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=QvOvCctr+pAz8ksHcURM2xZNCMshg4XarN8qKrannttTQ2FOE4KDbqtq7srMpOwz4 1JHx0l6vv7EunKDAodnpOLMI8y8O6ZybumaiQGvqS3OQGOGwubtWOWR1VNEHACY3CI knIqbiRhJ248tHbsBMMTAjCWpuhR15P+WrRykIc0b2tDubXud3fF9DCvlTj61tSy4S BbIsBpIjy33kShOULN7U0kA3qDoFHLsUdyOSSKzO/DmpjxyWIB5gI7vhrF8+LhIr1k K+6ngmOIArUfxEPLb1a/tgN5d9Zgkem2ek3fYyeoN1wyLZZk3mJvCgBfy0lH99CfWm 5vRiIBSTRznIQ== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190701_054055_124118_0E3B45F3 X-CRM114-Status: GOOD ( 10.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 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, digetx@gmail.com, 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 Acked-by: Thierry Reding --- Changes since [v11]: * None Changes since [v10]: * None Changes since [v9]: * None Changes since [v8]: * Added Acked-by from Thierry Changes since [v7]: * Changed data types of return and arguments to be inline with data being returned and passed. Changes since [v6]: * None Changes since [v5]: * None Changes since [v4]: * None Changes since [v3]: * None Changes since [v2]: * None Changes since [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 7818b4febb08..181449e342f1 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -53,6 +53,47 @@ u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) } EXPORT_SYMBOL_GPL(dw_pcie_find_capability); +static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start, + u8 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; +} + +u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 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 d8c66a6827dc..11c223471416 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -252,6 +252,7 @@ struct dw_pcie { container_of((endpoint), struct dw_pcie, ep) u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap); +u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap); int dw_pcie_read(void __iomem *addr, int size, u32 *val); int dw_pcie_write(void __iomem *addr, int size, u32 val);