/* $NetBSD: dwlpx_dma.c,v 1.30 2021/06/19 16:43:11 thorpej 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: dwlpx_dma.c,v 1.30 2021/06/19 16:43:11 thorpej Exp $"); #include #include #include #include #include #define _ALPHA_BUS_DMA_PRIVATE #include #include #include #include #include #include #include #include static bus_dma_tag_t dwlpx_dma_get_tag(bus_dma_tag_t, alpha_bus_t); static int dwlpx_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t, struct proc *, int); static int dwlpx_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, struct mbuf *, int); static int dwlpx_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, struct uio *, int); static int dwlpx_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t, bus_dma_segment_t *, int, bus_size_t, int); static void dwlpx_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); /* * Direct-mapped window: 2G at 2G */ #define DWLPx_DIRECT_MAPPED_BASE (2UL*1024UL*1024UL*1024UL) #define DWLPx_DIRECT_MAPPED_SIZE (2UL*1024UL*1024UL*1024UL) /* * SGMAP window A: 256M or 1G at 1G */ #define DWLPx_SG_MAPPED_BASE (1*1024*1024*1024) #define DWLPx_SG_MAPPED_SIZE(x) ((x) * PAGE_SIZE) /* DWLPx has a 256-byte out-bound DMA prefetch threshold. */ #define DWLPx_SG_MAPPED_PFTHRESH 256 /* * Set this to always use SGMAPs. */ #ifdef DWLPX_ALWAYS_USE_SGMAP int dwlpx_always_use_sgmap = 1; #else int dwlpx_always_use_sgmap = 0; #endif void dwlpx_dma_init(struct dwlpx_config *ccp) { char *exname; bus_dma_tag_t t; uint32_t *page_table; int i, lim, wmask; /* * Determine size of Window C based on the amount of SGMAP * page table SRAM available. */ if (ccp->cc_sc->dwlpx_sgmapsz == DWLPX_SG128K) { lim = 128 * 1024; wmask = PCIA_WMASK_1G; } else { lim = 32 * 1024; wmask = PCIA_WMASK_256M; } /* * Initialize the DMA tag used for direct-mapped DMA. Chain * this window to the SGMAP window, because we might have * a lot of memory in the machine. */ t = &ccp->cc_dmat_direct; t->_cookie = ccp; t->_wbase = DWLPx_DIRECT_MAPPED_BASE; t->_wsize = DWLPx_DIRECT_MAPPED_SIZE; t->_next_window = &ccp->cc_dmat_sgmap; t->_boundary = 0; t->_sgmap = NULL; t->_get_tag = dwlpx_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 = &ccp->cc_dmat_sgmap; t->_cookie = ccp; t->_wbase = DWLPx_SG_MAPPED_BASE; t->_wsize = DWLPx_SG_MAPPED_SIZE(lim); t->_next_window = NULL; t->_boundary = 0; t->_sgmap = &ccp->cc_sgmap; t->_pfthresh = DWLPx_SG_MAPPED_PFTHRESH; t->_get_tag = dwlpx_dma_get_tag; t->_dmamap_create = alpha_sgmap_dmamap_create; t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; t->_dmamap_load = dwlpx_bus_dmamap_load_sgmap; t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_sgmap; t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_sgmap; t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_sgmap; t->_dmamap_unload = dwlpx_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; /* * A few notes about SGMAP-mapped DMA on the DWLPx: * * The DWLPx has PCIA-resident SRAM that is used for * the SGMAP page table; there is no TLB. The DWLPA * has room for 32K entries, yielding a total of 256M * of sgva space. The DWLPB has 32K entries or 128K * entries, depending on TBIT, yielding either 256M or * 1G of sgva space. * * This sgva space must be shared across all windows * that wish to use SGMAP-mapped DMA; make sure to * adjust the "sgvabase" argument to alpha_sgmap_init() * accordingly if you create more than one SGMAP-mapped * window. Note that sgvabase != window base. The former * is used to compute indexes into the page table only. * * In the current implementation the first window is a * 2G window direct-mapped mapped at 2G and the second * window is disabled and the third window is a 256M * or 1GB scatter/gather map at 1GB. * * We just punt on trying to support ISA DMA. If you want * try that on a TurboLaser, well, you just lose. */ /* * Initialize the page table. */ page_table = (uint32_t *)ALPHA_PHYS_TO_K0SEG(PCIA_SGMAP_PT + ccp->cc_sysbase); for (i = 0; i < lim; i++) page_table[i * SGMAP_PTE_SPACING] = 0; alpha_mb(); /* * Initialize the SGMAP for window C: * * Size: 256M or 1GB * Window base: 1GB * SGVA base: 0 */ exname = kmem_asprintf("%s_sgmap_a", device_xname(ccp->cc_sc->dwlpx_dev)); alpha_sgmap_init(t, &ccp->cc_sgmap, exname, DWLPx_SG_MAPPED_BASE, 0, DWLPx_SG_MAPPED_SIZE(lim), sizeof(uint32_t), (void *)page_table, 0); /* * Set up DMA windows for this DWLPx. * * Do this even for all HPCs- even for the nonexistent * one on hose zero of a KFTIA. */ for (i = 0; i < NHPC; i++) { REGVAL(PCIA_WMASK_A(i) + ccp->cc_sysbase) = PCIA_WMASK_2G; REGVAL(PCIA_TBASE_A(i) + ccp->cc_sysbase) = 0; REGVAL(PCIA_WBASE_A(i) + ccp->cc_sysbase) = DWLPx_DIRECT_MAPPED_BASE | PCIA_WBASE_W_EN; REGVAL(PCIA_WMASK_B(i) + ccp->cc_sysbase) = 0; REGVAL(PCIA_TBASE_B(i) + ccp->cc_sysbase) = 0; REGVAL(PCIA_WBASE_B(i) + ccp->cc_sysbase) = 0; REGVAL(PCIA_WMASK_C(i) + ccp->cc_sysbase) = wmask; REGVAL(PCIA_TBASE_C(i) + ccp->cc_sysbase) = 0; REGVAL(PCIA_WBASE_C(i) + ccp->cc_sysbase) = DWLPx_SG_MAPPED_BASE | PCIA_WBASE_W_EN | PCIA_WBASE_SG_EN; alpha_mb(); } } /* * Return the bus dma tag to be used for the specified bus type. * INTERNAL USE ONLY! */ static bus_dma_tag_t dwlpx_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) { struct dwlpx_config *ccp = t->_cookie; switch (bustype) { case ALPHA_BUS_PCI: case ALPHA_BUS_EISA: if (dwlpx_always_use_sgmap) { /* * Always use SGMAPs (for testing purposes?) */ return (&ccp->cc_dmat_sgmap); } /* * Give these busses the direct-mapped window; if the * address crosses the threshold, it will fall back * onto the SGMAP window. */ return (&ccp->cc_dmat_direct); case ALPHA_BUS_ISA: /* * Don't even bother; it's not easy, given how the * page table is arranged, and it's not really worth * the trouble. */ panic("dwlpx_dma_get_tag: ISA DMA? Forget it..."); /* NOTREACHED */ default: panic("dwlpx_dma_get_tag: shouldn't be here, really..."); } } /* * Load a DWLPx SGMAP-mapped DMA map with a linear buffer. */ static int dwlpx_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags) { return (pci_sgmap_pte32_load(t, map, buf, buflen, p, flags, t->_sgmap)); } /* * Load a DWLPx SGMAP-mapped DMA map with an mbuf chain. */ static int dwlpx_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags) { return (pci_sgmap_pte32_load_mbuf(t, map, m, flags, t->_sgmap)); } /* * Load a DWLPx SGMAP-mapped DMA map with a uio. */ static int dwlpx_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags) { return (pci_sgmap_pte32_load_uio(t, map, uio, flags, t->_sgmap)); } /* * Load a DWLPx SGMAP-mapped DMA map with raw memory. */ static int dwlpx_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) { return (pci_sgmap_pte32_load_raw(t, map, segs, nsegs, size, flags, t->_sgmap)); } /* * Unload a DWLPx DMA map. */ static void dwlpx_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_pte32_unload(t, map, t->_sgmap); /* * Do the generic bits of the unload. */ _bus_dmamap_unload_common(t, map); }