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Murphy , Rob Herring References: <1560169080-27134-1-git-send-email-yong.wu@mediatek.com> <1560169080-27134-13-git-send-email-yong.wu@mediatek.com> From: Matthias Brugger Openpgp: preference=signencrypt Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata= mQINBFP1zgUBEAC21D6hk7//0kOmsUrE3eZ55kjc9DmFPKIz6l4NggqwQjBNRHIMh04BbCMY fL3eT7ZsYV5nur7zctmJ+vbszoOASXUpfq8M+S5hU2w7sBaVk5rpH9yW8CUWz2+ZpQXPJcFa OhLZuSKB1F5JcvLbETRjNzNU7B3TdS2+zkgQQdEyt7Ij2HXGLJ2w+yG2GuR9/iyCJRf10Okq gTh//XESJZ8S6KlOWbLXRE+yfkKDXQx2Jr1XuVvM3zPqH5FMg8reRVFsQ+vI0b+OlyekT/Xe 0Hwvqkev95GG6x7yseJwI+2ydDH6M5O7fPKFW5mzAdDE2g/K9B4e2tYK6/rA7Fq4cqiAw1+u EgO44+eFgv082xtBez5WNkGn18vtw0LW3ESmKh19u6kEGoi0WZwslCNaGFrS4M7OH+aOJeqK fx5dIv2CEbxc6xnHY7dwkcHikTA4QdbdFeUSuj4YhIZ+0QlDVtS1QEXyvZbZky7ur9rHkZvP ZqlUsLJ2nOqsmahMTIQ8Mgx9SLEShWqD4kOF4zNfPJsgEMB49KbS2o9jxbGB+JKupjNddfxZ HlH1KF8QwCMZEYaTNogrVazuEJzx6JdRpR3sFda/0x5qjTadwIW6Cl9tkqe2h391dOGX1eOA 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Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org On 10/06/2019 14:17, Yong Wu wrote: > In some SoCs like mt8183, SMI add GALS(Global Async Local Sync) module > which can help synchronize for the modules in different clock frequency. > It can be seen as a "asynchronous fifo". This is a example diagram: > > M4U > | > ---------- > | | > gals0-rx gals1-rx > | | > | | > gals0-tx gals1-tx > | | > ------------ > SMI Common > ------------ > | > +-----+--------+-----+- ... > | | | | > | gals-rx gals-rx | > | | | | > | | | | > | gals-tx gals-tx | > | | | | > larb1 larb2 larb3 larb4 > > GALS only help transfer the command/data while it doesn't have the > configuring register, thus it has the special "smi" clock and doesn't > have the "apb" clock. From the diagram above, we add "gals0" and > "gals1" clocks for smi-common and add a "gals" clock for smi-larb. > > This patch adds gals clock supporting in the SMI. Note that some larbs > may still don't have the "gals" clock like larb1 and larb4 above. > > This is also a preparing patch for mt8183 which has GALS. > > CC: Matthias Brugger > Signed-off-by: Yong Wu > Reviewed-by: Evan Green Reviewed-by: Matthias Brugger > --- > drivers/memory/mtk-smi.c | 36 ++++++++++++++++++++++++++++++++++++ > 1 file changed, 36 insertions(+) > > diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c > index 8a2f968..91634d7 100644 > --- a/drivers/memory/mtk-smi.c > +++ b/drivers/memory/mtk-smi.c > @@ -56,6 +56,7 @@ enum mtk_smi_gen { > > struct mtk_smi_common_plat { > enum mtk_smi_gen gen; > + bool has_gals; > }; > > struct mtk_smi_larb_gen { > @@ -63,11 +64,13 @@ struct mtk_smi_larb_gen { > int port_in_larb[MTK_LARB_NR_MAX + 1]; > void (*config_port)(struct device *); > unsigned int larb_direct_to_common_mask; > + bool has_gals; > }; > > struct mtk_smi { > struct device *dev; > struct clk *clk_apb, *clk_smi; > + struct clk *clk_gals0, *clk_gals1; > struct clk *clk_async; /*only needed by mt2701*/ > void __iomem *smi_ao_base; > > @@ -99,8 +102,20 @@ static int mtk_smi_enable(const struct mtk_smi *smi) > if (ret) > goto err_disable_apb; > > + ret = clk_prepare_enable(smi->clk_gals0); > + if (ret) > + goto err_disable_smi; > + > + ret = clk_prepare_enable(smi->clk_gals1); > + if (ret) > + goto err_disable_gals0; > + > return 0; > > +err_disable_gals0: > + clk_disable_unprepare(smi->clk_gals0); > +err_disable_smi: > + clk_disable_unprepare(smi->clk_smi); > err_disable_apb: > clk_disable_unprepare(smi->clk_apb); > err_put_pm: > @@ -110,6 +125,8 @@ static int mtk_smi_enable(const struct mtk_smi *smi) > > static void mtk_smi_disable(const struct mtk_smi *smi) > { > + clk_disable_unprepare(smi->clk_gals1); > + clk_disable_unprepare(smi->clk_gals0); > clk_disable_unprepare(smi->clk_smi); > clk_disable_unprepare(smi->clk_apb); > pm_runtime_put_sync(smi->dev); > @@ -310,6 +327,15 @@ static int mtk_smi_larb_probe(struct platform_device *pdev) > larb->smi.clk_smi = devm_clk_get(dev, "smi"); > if (IS_ERR(larb->smi.clk_smi)) > return PTR_ERR(larb->smi.clk_smi); > + > + if (larb->larb_gen->has_gals) { > + /* The larbs may still haven't gals even if the SoC support.*/ > + larb->smi.clk_gals0 = devm_clk_get(dev, "gals"); > + if (PTR_ERR(larb->smi.clk_gals0) == -ENOENT) > + larb->smi.clk_gals0 = NULL; > + else if (IS_ERR(larb->smi.clk_gals0)) > + return PTR_ERR(larb->smi.clk_gals0); > + } > larb->smi.dev = dev; > > if (larb->larb_gen->need_larbid) { > @@ -402,6 +428,16 @@ static int mtk_smi_common_probe(struct platform_device *pdev) > if (IS_ERR(common->clk_smi)) > return PTR_ERR(common->clk_smi); > > + if (common->plat->has_gals) { > + common->clk_gals0 = devm_clk_get(dev, "gals0"); > + if (IS_ERR(common->clk_gals0)) > + return PTR_ERR(common->clk_gals0); > + > + common->clk_gals1 = devm_clk_get(dev, "gals1"); > + if (IS_ERR(common->clk_gals1)) > + return PTR_ERR(common->clk_gals1); > + } > + > /* > * for mtk smi gen 1, we need to get the ao(always on) base to config > * m4u port, and we need to enable the aync clock for transform the smi > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu