From mboxrd@z Thu Jan 1 00:00:00 1970 From: mitchelh@codeaurora.org (Mitchel Humpherys) Date: Fri, 06 Mar 2015 09:15:17 -0800 Subject: [PATCH 2/5] iommu/mediatek: Add mt8173 IOMMU driver In-Reply-To: <1425638900-24989-3-git-send-email-yong.wu@mediatek.com> (yong wu's message of "Fri, 6 Mar 2015 18:48:17 +0800") References: <1425638900-24989-1-git-send-email-yong.wu@mediatek.com> <1425638900-24989-3-git-send-email-yong.wu@mediatek.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Mar 06 2015 at 02:48:17 AM, wrote: > From: Yong Wu > > This patch adds support for mediatek m4u (MultiMedia Memory Management Unit). > Currently this only supports m4u gen 2 with 2 levels of page table on mt8173. [...] > +static int mtk_iommu_invalidate_tlb(const struct mtk_iommu_info *piommu, > + int isinvall, unsigned int iova_start, > + unsigned int iova_end) > +{ > + void __iomem *m4u_base = piommu->m4u_base; > + u32 val; > + u64 start, end; > + > + start = sched_clock(); > + > + if (!isinvall) { > + iova_start = round_down(iova_start, SZ_4K); > + iova_end = round_up(iova_end, SZ_4K); > + } > + > + val = F_MMU_INV_EN_L2 | F_MMU_INV_EN_L1; > + > + writel(val, m4u_base + REG_INVLID_SEL); > + > + if (isinvall) { > + writel(F_MMU_INV_ALL, m4u_base + REG_MMU_INVLD); > + } else { > + writel(iova_start, m4u_base + REG_MMU_INVLD_SA); > + writel(iova_end, m4u_base + REG_MMU_INVLD_EA); > + writel(F_MMU_INV_RANGE, m4u_base + REG_MMU_INVLD); > + > + while (!readl(m4u_base + REG_MMU_CPE_DONE)) { > + end = sched_clock(); > + if (end - start >= 100000000ULL) { > + dev_warn(piommu->dev, "invalid don't done\n"); > + writel(F_MMU_INV_ALL, m4u_base + REG_MMU_INVLD); > + } > + }; Superfluous `;'. Also, maybe you should be using readl_poll_timeout? > + writel(0, m4u_base + REG_MMU_CPE_DONE); > + } > + > + return 0; > +} -Mitch -- Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project