/* $NetBSD: cia_dma.c,v 1.12 1998/06/23 02:31:05 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * 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: cia_dma.c,v 1.12 1998/06/23 02:31:05 thorpej Exp $"); #include #include #include #include #include #include #define _ALPHA_BUS_DMA_PRIVATE #include #include #include #include #include bus_dma_tag_t cia_dma_get_tag __P((bus_dma_tag_t, alpha_bus_t)); int cia_bus_dmamap_create_sgmap __P((bus_dma_tag_t, bus_size_t, int, bus_size_t, bus_size_t, int, bus_dmamap_t *)); void cia_bus_dmamap_destroy_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); int cia_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t, struct proc *, int)); int cia_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, struct mbuf *, int)); int cia_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, struct uio *, int)); int cia_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t, bus_dma_segment_t *, int, bus_size_t, int)); void cia_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); /* * Direct-mapped window: 1G at 1G */ #define CIA_DIRECT_MAPPED_BASE (1*1024*1024*1024) #define CIA_DIRECT_MAPPED_SIZE (1*1024*1024*1024) /* * SGMAP window: 8M at 8M */ #define CIA_SGMAP_MAPPED_BASE (8*1024*1024) #define CIA_SGMAP_MAPPED_SIZE (8*1024*1024) void cia_tlb_invalidate __P((void)); void cia_broken_pyxis_tlb_invalidate __P((void)); void (*cia_tlb_invalidate_fn) __P((void)); #define CIA_TLB_INVALIDATE() (*cia_tlb_invalidate_fn)() struct alpha_sgmap cia_pyxis_bug_sgmap; #define CIA_PYXIS_BUG_BASE (1*128*1024) #define CIA_PYXIS_BUG_SIZE (2*1024*1024) void cia_dma_init(ccp) struct cia_config *ccp; { bus_addr_t tbase; bus_dma_tag_t t; /* * Initialize the DMA tag used for direct-mapped DMA. */ t = &ccp->cc_dmat_direct; t->_cookie = ccp; t->_wbase = CIA_DIRECT_MAPPED_BASE; t->_wsize = CIA_DIRECT_MAPPED_SIZE; t->_next_window = NULL; t->_boundary = 0; t->_sgmap = NULL; t->_get_tag = cia_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 = CIA_SGMAP_MAPPED_BASE; t->_wsize = CIA_SGMAP_MAPPED_SIZE; t->_next_window = NULL; t->_boundary = 0; t->_sgmap = &ccp->cc_sgmap; t->_get_tag = cia_dma_get_tag; t->_dmamap_create = cia_bus_dmamap_create_sgmap; t->_dmamap_destroy = cia_bus_dmamap_destroy_sgmap; t->_dmamap_load = cia_bus_dmamap_load_sgmap; t->_dmamap_load_mbuf = cia_bus_dmamap_load_mbuf_sgmap; t->_dmamap_load_uio = cia_bus_dmamap_load_uio_sgmap; t->_dmamap_load_raw = cia_bus_dmamap_load_raw_sgmap; t->_dmamap_unload = cia_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; /* * The firmware has set up window 1 as a 1G direct-mapped DMA * window beginning at 1G. We leave it alone. Leave window * 0 alone until we reconfigure it for SGMAP-mapped DMA. * Windows 2 and 3 are already disabled. */ /* * Initialize the SGMAP. Must align page table to 32k * (hardware bug?). */ alpha_sgmap_init(t, &ccp->cc_sgmap, "cia_sgmap", CIA_SGMAP_MAPPED_BASE, 0, CIA_SGMAP_MAPPED_SIZE, sizeof(u_int64_t), NULL, (32*1024)); /* * Set up window 0 as an 8MB SGMAP-mapped window * starting at 8MB. */ REGVAL(CIA_PCI_W0BASE) = CIA_SGMAP_MAPPED_BASE | CIA_PCI_WnBASE_SG_EN | CIA_PCI_WnBASE_W_EN; alpha_mb(); REGVAL(CIA_PCI_W0MASK) = CIA_PCI_WnMASK_8M; alpha_mb(); tbase = ccp->cc_sgmap.aps_ptpa >> CIA_PCI_TnBASE_SHIFT; if ((tbase & CIA_PCI_TnBASE_MASK) != tbase) panic("cia_dma_init: bad page table address"); REGVAL(CIA_PCI_T0BASE) = tbase; alpha_mb(); /* * Pass 1 and 2 (i.e. revision <= 1) of the Pyxis have a * broken scatter/gather TLB; it cannot be invalidated. To * work around this problem, we configure window 2 as an SG * 2M window at 128M, which we use in DMA loopback mode to * read a spill page. This works by causing TLB misses, * causing the old entries to be purged to make room for * the new entries coming in for the spill page. */ if ((ccp->cc_flags & CCF_ISPYXIS) != 0 && ccp->cc_rev <= 1) { u_int64_t *page_table; int i; cia_tlb_invalidate_fn = cia_broken_pyxis_tlb_invalidate; alpha_sgmap_init(t, &cia_pyxis_bug_sgmap, "pyxis_bug_sgmap", CIA_PYXIS_BUG_BASE, 0, CIA_PYXIS_BUG_SIZE, sizeof(u_int64_t), NULL, (32*1024)); REGVAL(CIA_PCI_W2BASE) = CIA_PYXIS_BUG_BASE | CIA_PCI_WnBASE_SG_EN | CIA_PCI_WnBASE_W_EN; alpha_mb(); REGVAL(CIA_PCI_W2MASK) = CIA_PCI_WnMASK_2M; alpha_mb(); tbase = cia_pyxis_bug_sgmap.aps_ptpa >> CIA_PCI_TnBASE_SHIFT; if ((tbase & CIA_PCI_TnBASE_MASK) != tbase) panic("cia_dma_init: bad page table address"); REGVAL(CIA_PCI_T2BASE) = tbase; alpha_mb(); /* * Initialize the page table to point at the spill * page. Leave the last entry invalid. */ pci_sgmap_pte64_init_spill_page_pte(); for (i = 0, page_table = cia_pyxis_bug_sgmap.aps_pt; i < (CIA_PYXIS_BUG_SIZE / PAGE_SIZE) - 1; i++) { page_table[i] = pci_sgmap_pte64_prefetch_spill_page_pte; } alpha_mb(); } else cia_tlb_invalidate_fn = cia_tlb_invalidate; CIA_TLB_INVALIDATE(); /* XXX XXX BEGIN XXX XXX */ { /* XXX */ extern vm_offset_t alpha_XXX_dmamap_or; /* XXX */ alpha_XXX_dmamap_or = CIA_DIRECT_MAPPED_BASE; /* XXX */ } /* XXX */ /* XXX XXX END XXX XXX */ } /* * Return the bus dma tag to be used for the specified bus type. * INTERNAL USE ONLY! */ bus_dma_tag_t cia_dma_get_tag(t, bustype) bus_dma_tag_t t; alpha_bus_t bustype; { struct cia_config *ccp = t->_cookie; switch (bustype) { case ALPHA_BUS_PCI: case ALPHA_BUS_EISA: /* * Systems with a CIA can only support 1G * of memory, so we use the direct-mapped window * on busses that have 32-bit DMA. */ return (&ccp->cc_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 (&ccp->cc_dmat_sgmap); default: panic("cia_dma_get_tag: shouldn't be here, really..."); } } /* * Create a CIA SGMAP-mapped DMA map. */ int cia_bus_dmamap_create_sgmap(t, size, nsegments, maxsegsz, boundary, flags, dmamp) bus_dma_tag_t t; bus_size_t size; int nsegments; bus_size_t maxsegsz; bus_size_t boundary; int flags; bus_dmamap_t *dmamp; { bus_dmamap_t map; int error; error = _bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp); if (error) return (error); map = *dmamp; if (flags & BUS_DMA_ALLOCNOW) { error = alpha_sgmap_alloc(map, round_page(size), t->_sgmap, flags); if (error) cia_bus_dmamap_destroy_sgmap(t, map); } return (error); } /* * Destroy a CIA SGMAP-mapped DMA map. */ void cia_bus_dmamap_destroy_sgmap(t, map) bus_dma_tag_t t; bus_dmamap_t map; { if (map->_dm_flags & DMAMAP_HAS_SGMAP) alpha_sgmap_free(map, t->_sgmap); _bus_dmamap_destroy(t, map); } /* * Load a CIA SGMAP-mapped DMA map with a linear buffer. */ int cia_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 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) CIA_TLB_INVALIDATE(); return (error); } /* * Load a CIA SGMAP-mapped DMA map with an mbuf chain. */ int cia_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 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) CIA_TLB_INVALIDATE(); return (error); } /* * Load a CIA SGMAP-mapped DMA map with a uio. */ int cia_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 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) CIA_TLB_INVALIDATE(); return (error); } /* * Load a CIA SGMAP-mapped DMA map with raw memory. */ int cia_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 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) CIA_TLB_INVALIDATE(); return (error); } /* * Unload a CIA DMA map. */ void cia_bus_dmamap_unload_sgmap(t, map) 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); CIA_TLB_INVALIDATE(); /* * Do the generic bits of the unload. */ _bus_dmamap_unload(t, map); } /* * Flush the CIA scatter/gather TLB. */ void cia_tlb_invalidate() { alpha_mb(); REGVAL(CIA_PCI_TBIA) = CIA_PCI_TBIA_ALL; alpha_mb(); } /* * Flush the scatter/gather TLB on broken Pyxis chips. */ void cia_broken_pyxis_tlb_invalidate() { volatile u_int64_t dummy; u_int32_t ctrl; int i, s; s = splhigh(); /* * Put the Pyxis into PCI loopback mode. */ alpha_mb(); ctrl = REGVAL(CIA_CSR_CTRL); REGVAL(CIA_CSR_CTRL) = ctrl | CTRL_PCI_LOOP_EN; alpha_mb(); /* * Now, read from PCI dense memory space at offset 128M (our * target window base), skipping 64k on each read. This forces * S/G TLB misses. * * XXX Looks like the TLB entries are `not quite LRU'. We need * XXX to read more times than there are actual tags! */ for (i = 0; i < CIA_TLB_NTAGS + 4; i++) { dummy = *((volatile u_int64_t *) ALPHA_PHYS_TO_K0SEG(CIA_PCI_DENSE + CIA_PYXIS_BUG_BASE + (i * 65536))); } /* * Restore normal PCI operation. */ alpha_mb(); REGVAL(CIA_CSR_CTRL) = ctrl; alpha_mb(); splx(s); }