drm/meson/meson_rdma.c

24 int meson_rdma_init(struct meson_drm *priv)
26 	if (!priv->rdma.addr) {
28 		priv->rdma.addr =
29 			dma_alloc_coherent(priv->dev, SZ_4K,
30 					   &priv->rdma.addr_dma,
32 		if (!priv->rdma.addr)
36 	priv->rdma.offset = 0;
39 		       priv->io_base + _REG(RDMA_CTRL));
43 		       priv->io_base + _REG(RDMA_CTRL));
48 void meson_rdma_free(struct meson_drm *priv)
50 	if (!priv->rdma.addr && !priv->rdma.addr_dma)
53 	meson_rdma_stop(priv);
55 	dma_free_coherent(priv->dev, SZ_4K,
56 			  priv->rdma.addr, priv->rdma.addr_dma);
58 	priv->rdma.addr = NULL;
59 	priv->rdma.addr_dma = (dma_addr_t)0;
62 void meson_rdma_setup(struct meson_drm *priv)
68 			    priv->io_base + _REG(RDMA_ACCESS_AUTO));
71 void meson_rdma_stop(struct meson_drm *priv)
75 			    priv->io_base + _REG(RDMA_CTRL));
81 			    priv->io_base + _REG(RDMA_ACCESS_AUTO));
84 void meson_rdma_reset(struct meson_drm *priv)
86 	meson_rdma_stop(priv);
88 	priv->rdma.offset = 0;
91 static void meson_rdma_writel(struct meson_drm *priv, uint32_t val,
94 	if (priv->rdma.offset >= (SZ_4K / RDMA_DESC_SIZE)) {
95 		dev_warn_once(priv->dev, "%s: overflow\n", __func__);
99 	priv->rdma.addr[priv->rdma.offset++] = reg;
100 	priv->rdma.addr[priv->rdma.offset++] = val;
109 void meson_rdma_writel_sync(struct meson_drm *priv, uint32_t val, uint32_t reg)
111 	meson_rdma_writel(priv, val, reg);
113 	writel_relaxed(val, priv->io_base + _REG(reg));
116 void meson_rdma_flush(struct meson_drm *priv)
118 	meson_rdma_stop(priv);
121 	writel(priv->rdma.addr_dma,
122 	       priv->io_base + _REG(RDMA_AHB_START_ADDR_1));
125 	writel(priv->rdma.addr_dma + (priv->rdma.offset * RDMA_DESC_SIZE) - 1,
126 	       priv->io_base + _REG(RDMA_AHB_END_ADDR_1));
132 			    priv->io_base + _REG(RDMA_ACCESS_AUTO));
134 	priv->rdma.offset = 0;