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Message-Id: <1350684496-14384-2-git-send-email-mark.einon@gmail.com> Date: Fri, 19 Oct 2012 23:08:15 +0100 From: Mark Einon <mark.einon@...il.com> To: devel@...verdev.osuosl.org, gregkh@...uxfoundation.org Cc: linux-kernel@...r.kernel.org, Mark Einon <mark.einon@...il.com> Subject: [PATCH 2/3] staging: et131x: Use upper_32_bits() instead of '>> 32' >From a previous comment by Alan Cox: '>> 32 of a 32bit value is undefined in C. The compiler is free to do what it likes with this...' Change all uses of '>> 32' to use upper_32_bits() and use the corresponding lower_32_bits() to match. Also remove an incorrect comment about dma alloc always returning 32bit addresses. Signed-off-by: Mark Einon <mark.einon@...il.com> --- drivers/staging/et131x/et131x.c | 55 ++++++++++++++++++--------------------- 1 file changed, 25 insertions(+), 30 deletions(-) diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c index 3fd8142..32f909a 100644 --- a/drivers/staging/et131x/et131x.c +++ b/drivers/staging/et131x/et131x.c @@ -1859,25 +1859,17 @@ static void et131x_config_rx_dma_regs(struct et131x_adapter *adapter) /* Halt RXDMA to perform the reconfigure. */ et131x_rx_dma_disable(adapter); - /* Load the completion writeback physical address - * - * NOTE : dma_alloc_coherent(), used above to alloc DMA regions, - * ALWAYS returns SAC (32-bit) addresses. If DAC (64-bit) addresses - * are ever returned, make sure the high part is retrieved here - * before storing the adjusted address. - */ - writel((u32) ((u64)rx_local->rx_status_bus >> 32), - &rx_dma->dma_wb_base_hi); - writel((u32) rx_local->rx_status_bus, &rx_dma->dma_wb_base_lo); + /* Load the completion writeback physical address */ + writel(upper_32_bits(rx_local->rx_status_bus), &rx_dma->dma_wb_base_hi); + writel(lower_32_bits(rx_local->rx_status_bus), &rx_dma->dma_wb_base_lo); memset(rx_local->rx_status_block, 0, sizeof(struct rx_status_block)); /* Set the address and parameters of the packet status ring into the * 1310's registers */ - writel((u32) ((u64)rx_local->ps_ring_physaddr >> 32), - &rx_dma->psr_base_hi); - writel((u32) rx_local->ps_ring_physaddr, &rx_dma->psr_base_lo); + writel(upper_32_bits(rx_local->ps_ring_physaddr), &rx_dma->psr_base_hi); + writel(lower_32_bits(rx_local->ps_ring_physaddr), &rx_dma->psr_base_lo); writel(rx_local->psr_num_entries - 1, &rx_dma->psr_num_des); writel(0, &rx_dma->psr_full_offset); @@ -1902,9 +1894,10 @@ static void et131x_config_rx_dma_regs(struct et131x_adapter *adapter) /* Set the address and parameters of Free buffer ring 1 (and 0 if * required) into the 1310's registers */ - writel((u32) (rx_local->fbr[0]->ring_physaddr >> 32), + writel(upper_32_bits(rx_local->fbr[0]->ring_physaddr), &rx_dma->fbr1_base_hi); - writel((u32) rx_local->fbr[0]->ring_physaddr, &rx_dma->fbr1_base_lo); + writel(lower_32_bits(rx_local->fbr[0]->ring_physaddr), + &rx_dma->fbr1_base_lo); writel(rx_local->fbr[0]->num_entries - 1, &rx_dma->fbr1_num_des); writel(ET_DMA10_WRAP, &rx_dma->fbr1_full_offset); @@ -1926,9 +1919,10 @@ static void et131x_config_rx_dma_regs(struct et131x_adapter *adapter) fbr_entry++; } - writel((u32) (rx_local->fbr[1]->ring_physaddr >> 32), + writel(upper_32_bits(rx_local->fbr[1]->ring_physaddr), &rx_dma->fbr0_base_hi); - writel((u32) rx_local->fbr[1]->ring_physaddr, &rx_dma->fbr0_base_lo); + writel(lower_32_bits(rx_local->fbr[1]->ring_physaddr), + &rx_dma->fbr0_base_lo); writel(rx_local->fbr[1]->num_entries - 1, &rx_dma->fbr0_num_des); writel(ET_DMA10_WRAP, &rx_dma->fbr0_full_offset); @@ -1970,18 +1964,19 @@ static void et131x_config_tx_dma_regs(struct et131x_adapter *adapter) struct txdma_regs __iomem *txdma = &adapter->regs->txdma; /* Load the hardware with the start of the transmit descriptor ring. */ - writel((u32) ((u64)adapter->tx_ring.tx_desc_ring_pa >> 32), + writel(upper_32_bits(adapter->tx_ring.tx_desc_ring_pa), &txdma->pr_base_hi); - writel((u32) adapter->tx_ring.tx_desc_ring_pa, + writel(lower_32_bits(adapter->tx_ring.tx_desc_ring_pa), &txdma->pr_base_lo); /* Initialise the transmit DMA engine */ writel(NUM_DESC_PER_RING_TX - 1, &txdma->pr_num_des); /* Load the completion writeback physical address */ - writel((u32)((u64)adapter->tx_ring.tx_status_pa >> 32), - &txdma->dma_wb_base_hi); - writel((u32)adapter->tx_ring.tx_status_pa, &txdma->dma_wb_base_lo); + writel(upper_32_bits(adapter->tx_ring.tx_status_pa), + &txdma->dma_wb_base_hi); + writel(lower_32_bits(adapter->tx_ring.tx_status_pa), + &txdma->dma_wb_base_lo); *adapter->tx_ring.tx_status = 0; @@ -2460,16 +2455,16 @@ static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter) * so the device can access it */ rx_ring->fbr[0]->bus_high[index] = - (u32) (fbr1_tmp_physaddr >> 32); + upper_32_bits(fbr1_tmp_physaddr); rx_ring->fbr[0]->bus_low[index] = - (u32) fbr1_tmp_physaddr; + lower_32_bits(fbr1_tmp_physaddr); fbr1_tmp_physaddr += rx_ring->fbr[0]->buffsize; rx_ring->fbr[0]->buffer1[index] = - rx_ring->fbr[0]->virt[index]; + rx_ring->fbr[0]->virt[index]; rx_ring->fbr[0]->buffer2[index] = - rx_ring->fbr[0]->virt[index] - 4; + rx_ring->fbr[0]->virt[index] - 4; } } @@ -2508,16 +2503,16 @@ static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter) (j * rx_ring->fbr[1]->buffsize) + fbr0_offset; rx_ring->fbr[1]->bus_high[index] = - (u32) (fbr0_tmp_physaddr >> 32); + upper_32_bits(fbr0_tmp_physaddr); rx_ring->fbr[1]->bus_low[index] = - (u32) fbr0_tmp_physaddr; + lower_32_bits(fbr0_tmp_physaddr); fbr0_tmp_physaddr += rx_ring->fbr[1]->buffsize; rx_ring->fbr[1]->buffer1[index] = - rx_ring->fbr[1]->virt[index]; + rx_ring->fbr[1]->virt[index]; rx_ring->fbr[1]->buffer2[index] = - rx_ring->fbr[1]->virt[index] - 4; + rx_ring->fbr[1]->virt[index] - 4; } } #endif -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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