From d1e71a3a7ab9db0168b6885171e0576383216ac8 Mon Sep 17 00:00:00 2001 From: Biju Das Date: Wed, 15 Mar 2023 06:45:01 +0000 Subject: dmaengine: sh: rz-dmac: Add reset support Add reset support for DMAC module found on RZ/G2L alike SoCs. For booting the board, reset release of the DMAC module is required otherwise we don't get GIC interrupts. Currently the reset release was done by the bootloader now move this to the driver instead. Signed-off-by: Biju Das Reviewed-by: Lad Prabhakar Link: https://lore.kernel.org/r/20230315064501.21491-1-biju.das.jz@bp.renesas.com Signed-off-by: Vinod Koul --- drivers/dma/sh/rz-dmac.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'drivers/dma/sh') diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c index 476847a4916b..6b62e01ba658 100644 --- a/drivers/dma/sh/rz-dmac.c +++ b/drivers/dma/sh/rz-dmac.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -92,6 +93,7 @@ struct rz_dmac_chan { struct rz_dmac { struct dma_device engine; struct device *dev; + struct reset_control *rstc; void __iomem *base; void __iomem *ext_base; @@ -889,6 +891,11 @@ static int rz_dmac_probe(struct platform_device *pdev) /* Initialize the channels. */ INIT_LIST_HEAD(&dmac->engine.channels); + dmac->rstc = devm_reset_control_array_get_exclusive(&pdev->dev); + if (IS_ERR(dmac->rstc)) + return dev_err_probe(&pdev->dev, PTR_ERR(dmac->rstc), + "failed to get resets\n"); + pm_runtime_enable(&pdev->dev); ret = pm_runtime_resume_and_get(&pdev->dev); if (ret < 0) { @@ -896,6 +903,10 @@ static int rz_dmac_probe(struct platform_device *pdev) goto err_pm_disable; } + ret = reset_control_deassert(dmac->rstc); + if (ret) + goto err_pm_runtime_put; + for (i = 0; i < dmac->n_channels; i++) { ret = rz_dmac_chan_probe(dmac, &dmac->channels[i], i); if (ret < 0) @@ -940,6 +951,7 @@ static int rz_dmac_probe(struct platform_device *pdev) dma_register_err: of_dma_controller_free(pdev->dev.of_node); err: + reset_control_assert(dmac->rstc); channel_num = i ? i - 1 : 0; for (i = 0; i < channel_num; i++) { struct rz_dmac_chan *channel = &dmac->channels[i]; @@ -950,6 +962,7 @@ err: channel->lmdesc.base_dma); } +err_pm_runtime_put: pm_runtime_put(&pdev->dev); err_pm_disable: pm_runtime_disable(&pdev->dev); @@ -972,6 +985,7 @@ static int rz_dmac_remove(struct platform_device *pdev) } of_dma_controller_free(pdev->dev.of_node); dma_async_device_unregister(&dmac->engine); + reset_control_assert(dmac->rstc); pm_runtime_put(&pdev->dev); pm_runtime_disable(&pdev->dev); -- cgit v1.2.3