From 00f05c02f9e7342fb423110061bdf66921fe80b2 Mon Sep 17 00:00:00 2001 From: Francisco Iglesias Date: Fri, 21 Jan 2022 16:11:36 +0000 Subject: hw/dma/xlnx_csu_dma: Support starting a read transfer through a class method An option on real hardware when embedding a DMA engine into a peripheral is to make the peripheral control the engine through a custom DMA control (hardware) interface between the two. Software drivers in this scenario configure and trigger DMA operations through the controlling peripheral's register API (for example, writing a specific bit in a register could propagate down to a transfer start signal on the DMA control interface). At the same time the status, results and interrupts for the transfer might still be intended to be read and caught through the DMA engine's register API (and signals). This patch adds a class 'read' method for allowing to start read transfers from peripherals embedding and controlling the Xilinx CSU DMA engine as in above scenario. Signed-off-by: Francisco Iglesias Reviewed-by: Luc Michel Message-id: 20220121161141.14389-6-francisco.iglesias@xilinx.com Signed-off-by: Peter Maydell --- hw/dma/xlnx_csu_dma.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'hw/dma/xlnx_csu_dma.c') diff --git a/hw/dma/xlnx_csu_dma.c b/hw/dma/xlnx_csu_dma.c index 896bb3574d..095f954476 100644 --- a/hw/dma/xlnx_csu_dma.c +++ b/hw/dma/xlnx_csu_dma.c @@ -472,6 +472,20 @@ static uint64_t addr_msb_pre_write(RegisterInfo *reg, uint64_t val) return val & R_ADDR_MSB_ADDR_MSB_MASK; } +static MemTxResult xlnx_csu_dma_class_read(XlnxCSUDMA *s, hwaddr addr, + uint32_t len) +{ + RegisterInfo *reg = &s->regs_info[R_SIZE]; + uint64_t we = MAKE_64BIT_MASK(0, 4 * 8); + + s->regs[R_ADDR] = addr; + s->regs[R_ADDR_MSB] = (uint64_t)addr >> 32; + + register_write(reg, len, we, object_get_typename(OBJECT(s)), false); + + return (s->regs[R_SIZE] == 0) ? MEMTX_OK : MEMTX_ERROR; +} + static const RegisterAccessInfo *xlnx_csu_dma_regs_info[] = { #define DMACH_REGINFO(NAME, snd) \ (const RegisterAccessInfo []) { \ @@ -696,6 +710,7 @@ static void xlnx_csu_dma_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); StreamSinkClass *ssc = STREAM_SINK_CLASS(klass); + XlnxCSUDMAClass *xcdc = XLNX_CSU_DMA_CLASS(klass); dc->reset = xlnx_csu_dma_reset; dc->realize = xlnx_csu_dma_realize; @@ -704,6 +719,8 @@ static void xlnx_csu_dma_class_init(ObjectClass *klass, void *data) ssc->push = xlnx_csu_dma_stream_push; ssc->can_push = xlnx_csu_dma_stream_can_push; + + xcdc->read = xlnx_csu_dma_class_read; } static void xlnx_csu_dma_init(Object *obj) -- cgit 1.4.1