/* $NetBSD: lca_dma.c,v 1.28 2023/08/01 21:26:27 andvar Exp $ */ /*- * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include /* RCS ID & Copyright macro defns */ __KERNEL_RCSID(0, "$NetBSD: lca_dma.c,v 1.28 2023/08/01 21:26:27 andvar Exp $"); #include #include #include #include #define _ALPHA_BUS_DMA_PRIVATE #include #include #include #include #include static bus_dma_tag_t lca_dma_get_tag(bus_dma_tag_t, alpha_bus_t); static int lca_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t, struct proc *, int); static int lca_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, struct mbuf *, int); static int lca_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, struct uio *, int); static int lca_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t, bus_dma_segment_t *, int, bus_size_t, int); static void lca_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); /* * Direct-mapped window: 1G at 1G */ #define LCA_DIRECT_MAPPED_BASE (1*1024*1024*1024) #define LCA_DIRECT_MAPPED_SIZE (1*1024*1024*1024) /* * SGMAP window: 8M at 8M */ #define LCA_SGMAP_MAPPED_BASE (8*1024*1024) #define LCA_SGMAP_MAPPED_SIZE (8*1024*1024) /* * The LCA doesn't have a DMA prefetch threshold. However, it is known * to lose if we don't allocate a spill page. So initialize it to 256. */ #define LCA_SGMAP_PFTHRESH 256 /* * Macro to flush LCA scatter/gather TLB. */ #define LCA_TLB_INVALIDATE() \ do { \ alpha_mb(); \ REGVAL64(LCA_IOC_TBIA) = 0; \ alpha_mb(); \ } while (0) void lca_dma_init(struct lca_config *lcp) { bus_dma_tag_t t; /* * Initialize the DMA tag used for direct-mapped DMA. */ t = &lcp->lc_dmat_direct; t->_cookie = lcp; t->_wbase = LCA_DIRECT_MAPPED_BASE; t->_wsize = LCA_DIRECT_MAPPED_SIZE; t->_next_window = NULL; t->_boundary = 0; t->_sgmap = NULL; t->_get_tag = lca_dma_get_tag; t->_dmamap_create = _bus_dmamap_create; t->_dmamap_destroy = _bus_dmamap_destroy; t->_dmamap_load = _bus_dmamap_load_direct; t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; t->_dmamap_unload = _bus_dmamap_unload; t->_dmamap_sync = _bus_dmamap_sync; t->_dmamem_alloc = _bus_dmamem_alloc; t->_dmamem_free = _bus_dmamem_free; t->_dmamem_map = _bus_dmamem_map; t->_dmamem_unmap = _bus_dmamem_unmap; t->_dmamem_mmap = _bus_dmamem_mmap; /* * Initialize the DMA tag used for sgmap-mapped DMA. */ t = &lcp->lc_dmat_sgmap; t->_cookie = lcp; t->_wbase = LCA_SGMAP_MAPPED_BASE; t->_wsize = LCA_SGMAP_MAPPED_SIZE; t->_next_window = NULL; t->_boundary = 0; t->_sgmap = &lcp->lc_sgmap; t->_pfthresh = LCA_SGMAP_PFTHRESH; t->_get_tag = lca_dma_get_tag; t->_dmamap_create = alpha_sgmap_dmamap_create; t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; t->_dmamap_load = lca_bus_dmamap_load_sgmap; t->_dmamap_load_mbuf = lca_bus_dmamap_load_mbuf_sgmap; t->_dmamap_load_uio = lca_bus_dmamap_load_uio_sgmap; t->_dmamap_load_raw = lca_bus_dmamap_load_raw_sgmap; t->_dmamap_unload = lca_bus_dmamap_unload_sgmap; t->_dmamap_sync = _bus_dmamap_sync; t->_dmamem_alloc = _bus_dmamem_alloc; t->_dmamem_free = _bus_dmamem_free; t->_dmamem_map = _bus_dmamem_map; t->_dmamem_unmap = _bus_dmamem_unmap; t->_dmamem_mmap = _bus_dmamem_mmap; /* Initialize window 1 as a direct-mapped window. */ REGVAL64(LCA_IOC_W_BASE1) = LCA_DIRECT_MAPPED_BASE | IOC_W_BASE_WEN; REGVAL64(LCA_IOC_W_MASK1) = IOC_W_MASK_1G; alpha_mb(); /* Disable window 0 while we set it up. */ REGVAL64(LCA_IOC_W_BASE0) = 0; alpha_mb(); /* * Initialize the SGMAP. */ alpha_sgmap_init(t, &lcp->lc_sgmap, "lca_sgmap", LCA_SGMAP_MAPPED_BASE, 0, LCA_SGMAP_MAPPED_SIZE, sizeof(uint64_t), NULL, 0); /* * Set up window 0 as an 8MB SGMAP-mapped window * starting at 8MB. */ REGVAL64(LCA_IOC_W_BASE0) = LCA_SGMAP_MAPPED_BASE | IOC_W_BASE_SG | IOC_W_BASE_WEN; REGVAL64(LCA_IOC_W_MASK0) = IOC_W_MASK_8M; alpha_mb(); if ((lcp->lc_sgmap.aps_ptpa & IOC_W_T_BASE) != lcp->lc_sgmap.aps_ptpa) panic("lca_dma_init: bad page table address"); REGVAL64(LCA_IOC_W_T_BASE0) = lcp->lc_sgmap.aps_ptpa; alpha_mb(); /* Enable the scatter/gather TLB. */ REGVAL64(LCA_IOC_TB_ENA) = IOC_TB_ENA_TEN; alpha_mb(); LCA_TLB_INVALIDATE(); } /* * Return the bus dma tag to be used for the specified bus type. * INTERNAL USE ONLY! */ static bus_dma_tag_t lca_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) { struct lca_config *lcp = t->_cookie; switch (bustype) { case ALPHA_BUS_PCI: case ALPHA_BUS_EISA: /* * Systems with an LCA can only support 1G * of memory, so we use the direct-mapped window * on busses that have 32-bit DMA. */ return (&lcp->lc_dmat_direct); case ALPHA_BUS_ISA: /* * ISA doesn't have enough address bits to use * the direct-mapped DMA window, so we must use * SGMAPs. */ return (&lcp->lc_dmat_sgmap); default: panic("lca_dma_get_tag: shouldn't be here, really..."); } } /* * Load an LCA SGMAP-mapped DMA map with a linear buffer. */ static int lca_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags) { int error; error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, t->_sgmap); if (error == 0) LCA_TLB_INVALIDATE(); return (error); } /* * Load an LCA SGMAP-mapped DMA map with an mbuf chain. */ static int lca_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags) { int error; error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); if (error == 0) LCA_TLB_INVALIDATE(); return (error); } /* * Load an LCA SGMAP-mapped DMA map with a uio. */ static int lca_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags) { int error; error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); if (error == 0) LCA_TLB_INVALIDATE(); return (error); } /* * Load an LCA SGMAP-mapped DMA map with raw memory. */ static int lca_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t, bus_dmamap_t map, bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) { int error; error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, t->_sgmap); if (error == 0) LCA_TLB_INVALIDATE(); return (error); } /* * Unload an LCA DMA map. */ static void lca_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) { /* * Invalidate any SGMAP page table entries used by this * mapping. */ pci_sgmap_pte64_unload(t, map, t->_sgmap); LCA_TLB_INVALIDATE(); /* * Do the generic bits of the unload. */ _bus_dmamap_unload_common(t, map); }