From db4d22c07e3e652eeec82abcc1399e6305edd838 Mon Sep 17 00:00:00 2001 From: Sudeep Holla Date: Tue, 29 Nov 2016 14:37:05 +0000 Subject: [PATCH] mailbox: mailbox-test: allow reserved areas in SRAM When CONFIG_SRAM is enable and the SRAM region is found, the entire SRAM region resource is requested and marked as occupied by SRAM driver even if certain parts of regions is marked reserved. It's quite possible that a small region of the SRAM is reserved for all the mailbox communication and hence it may fail to request the region as it's already marked busy region. This patch tries to just do a ioremap of this mailbox memory region if it finds it busy. Cc: Lee Jones Signed-off-by: Sudeep Holla Signed-off-by: Jassi Brar --- drivers/mailbox/mailbox-test.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c index 383a8b7600ac..9c79f8019d2a 100644 --- a/drivers/mailbox/mailbox-test.c +++ b/drivers/mailbox/mailbox-test.c @@ -352,6 +352,7 @@ static int mbox_test_probe(struct platform_device *pdev) { struct mbox_test_device *tdev; struct resource *res; + resource_size_t size; int ret; tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL); @@ -360,14 +361,21 @@ static int mbox_test_probe(struct platform_device *pdev) /* It's okay for MMIO to be NULL */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + size = resource_size(res); tdev->tx_mmio = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(tdev->tx_mmio)) + if (PTR_ERR(tdev->tx_mmio) == -EBUSY) + /* if reserved area in SRAM, try just ioremap */ + tdev->tx_mmio = devm_ioremap(&pdev->dev, res->start, size); + else if (IS_ERR(tdev->tx_mmio)) tdev->tx_mmio = NULL; /* If specified, second reg entry is Rx MMIO */ res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + size = resource_size(res); tdev->rx_mmio = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(tdev->rx_mmio)) + if (PTR_ERR(tdev->rx_mmio) == -EBUSY) + tdev->rx_mmio = devm_ioremap(&pdev->dev, res->start, size); + else if (IS_ERR(tdev->rx_mmio)) tdev->rx_mmio = tdev->tx_mmio; tdev->tx_channel = mbox_test_request_channel(pdev, "tx"); -- 2.30.2