From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-cys01nam02on0059.outbound.protection.outlook.com ([104.47.37.59]:30048 "EHLO NAM02-CY1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753057AbdHWG05 (ORCPT ); Wed, 23 Aug 2017 02:26:57 -0400 From: Zhiqiang Hou To: , , , CC: , , , , , , Hou Zhiqiang Subject: [PATCHv4 6/9] PCI: designware: add accessors for write permission of DBI read-only registers Date: Wed, 23 Aug 2017 14:08:53 +0800 Message-ID: <20170823060856.9387-7-Zhiqiang.Hou@nxp.com> In-Reply-To: <20170823060856.9387-1-Zhiqiang.Hou@nxp.com> References: <20170823060856.9387-1-Zhiqiang.Hou@nxp.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-pci-owner@vger.kernel.org List-ID: From: Hou Zhiqiang The read-only DBI registers can be written over the DBI when set the "Write to RO Registers Using DBI" (DBI_RO_WR_EN) field of the MISC_CONTROL_1_OFF register. Signed-off-by: Hou Zhiqiang Acked-By: Joao Pinto --- V4: - no change drivers/pci/dwc/pcie-designware.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h index 7366c8167404..0c5f874345f6 100644 --- a/drivers/pci/dwc/pcie-designware.h +++ b/drivers/pci/dwc/pcie-designware.h @@ -76,6 +76,9 @@ #define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16) #define PCIE_ATU_UPPER_TARGET 0x91C +#define PCIE_MISC_CONTROL_1_OFF 0x8BC +#define PCIE_DBI_RO_WR_EN (0x1 << 0) + /* * iATU Unroll-specific register definitions * From 4.80 core version the address translation will be made by unroll @@ -279,6 +282,28 @@ static inline u32 dw_pcie_readl_dbi2(struct dw_pcie *pci, u32 reg) return __dw_pcie_read_dbi(pci, pci->dbi_base2, reg, 0x4); } +static inline void dw_pcie_dbi_ro_wr_en(struct dw_pcie *pci) +{ + u32 reg; + u32 val; + + reg = PCIE_MISC_CONTROL_1_OFF; + val = dw_pcie_readl_dbi(pci, reg); + val |= PCIE_DBI_RO_WR_EN; + dw_pcie_writel_dbi(pci, reg, val); +} + +static inline void dw_pcie_dbi_ro_wr_dis(struct dw_pcie *pci) +{ + u32 reg; + u32 val; + + reg = PCIE_MISC_CONTROL_1_OFF; + val = dw_pcie_readl_dbi(pci, reg); + val &= ~PCIE_DBI_RO_WR_EN; + dw_pcie_writel_dbi(pci, reg, val); +} + #ifdef CONFIG_PCIE_DW_HOST irqreturn_t dw_handle_msi_irq(struct pcie_port *pp); void dw_pcie_msi_init(struct pcie_port *pp); -- 2.14.1