1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * include/asm-m68k/dma.h 4 * 5 * Copyright 1995 (C) David S. Miller (davem@caip.rutgers.edu) 6 * 7 * Hacked to fit Sun3x needs by Thomas Bogendoerfer 8 */ 9 10#ifndef __M68K_DVMA_H 11#define __M68K_DVMA_H 12 13 14#define DVMA_PAGE_SHIFT 13 15#define DVMA_PAGE_SIZE (1UL << DVMA_PAGE_SHIFT) 16#define DVMA_PAGE_MASK (~(DVMA_PAGE_SIZE-1)) 17#define DVMA_PAGE_ALIGN(addr) ALIGN(addr, DVMA_PAGE_SIZE) 18 19extern void dvma_init(void); 20extern int dvma_map_iommu(unsigned long kaddr, unsigned long baddr, 21 int len); 22 23#define dvma_malloc(x) dvma_malloc_align(x, 0) 24#define dvma_map(x, y) dvma_map_align(x, y, 0) 25#define dvma_map_vme(x, y) (dvma_map(x, y) & 0xfffff) 26#define dvma_map_align_vme(x, y, z) (dvma_map_align (x, y, z) & 0xfffff) 27extern unsigned long dvma_map_align(unsigned long kaddr, int len, 28 int align); 29extern void *dvma_malloc_align(unsigned long len, unsigned long align); 30 31extern void dvma_unmap(void *baddr); 32extern void dvma_free(void *vaddr); 33 34 35#ifdef CONFIG_SUN3 36/* sun3 dvma page support */ 37 38/* memory and pmegs potentially reserved for dvma */ 39#define DVMA_PMEG_START 10 40#define DVMA_PMEG_END 16 41#define DVMA_START 0xf00000 42#define DVMA_END 0xfe0000 43#define DVMA_SIZE (DVMA_END-DVMA_START) 44#define IOMMU_TOTAL_ENTRIES 128 45#define IOMMU_ENTRIES 120 46 47/* empirical kludge -- dvma regions only seem to work right on 0x10000 48 byte boundaries */ 49#define DVMA_REGION_SIZE 0x10000 50#define DVMA_ALIGN(addr) (((addr)+DVMA_REGION_SIZE-1) & \ 51 ~(DVMA_REGION_SIZE-1)) 52 53/* virt <-> phys conversions */ 54#define dvma_vtop(x) ((unsigned long)(x) & 0xffffff) 55#define dvma_ptov(x) ((unsigned long)(x) | 0xf000000) 56#define dvma_vtovme(x) ((unsigned long)(x) & 0x00fffff) 57#define dvma_vmetov(x) ((unsigned long)(x) | 0xff00000) 58#define dvma_vtob(x) dvma_vtop(x) 59#define dvma_btov(x) dvma_ptov(x) 60 61void sun3_dvma_init(void); 62 63static inline int dvma_map_cpu(unsigned long kaddr, unsigned long vaddr, 64 int len) 65{ 66 return 0; 67} 68 69static inline void dvma_unmap_iommu(unsigned long baddr, int len) { } 70 71#else /* Sun3x */ 72 73/* sun3x dvma page support */ 74 75#define DVMA_START 0x0 76#define DVMA_END 0xf00000 77#define DVMA_SIZE (DVMA_END-DVMA_START) 78#define IOMMU_TOTAL_ENTRIES 2048 79/* the prom takes the top meg */ 80#define IOMMU_ENTRIES (IOMMU_TOTAL_ENTRIES - 0x80) 81 82#define dvma_vtob(x) ((unsigned long)(x) & 0x00ffffff) 83#define dvma_btov(x) ((unsigned long)(x) | 0xff000000) 84 85static inline void sun3_dvma_init(void) { } 86 87int dvma_map_cpu(unsigned long kaddr, unsigned long vaddr, int len); 88 89void dvma_unmap_iommu(unsigned long baddr, int len); 90 91/* everything below this line is specific to dma used for the onboard 92 ESP scsi on sun3x */ 93 94/* Structure to describe the current status of DMA registers on the Sparc */ 95struct sparc_dma_registers { 96 __volatile__ unsigned long cond_reg; /* DMA condition register */ 97 __volatile__ unsigned long st_addr; /* Start address of this transfer */ 98 __volatile__ unsigned long cnt; /* How many bytes to transfer */ 99 __volatile__ unsigned long dma_test; /* DMA test register */ 100}; 101 102/* DVMA chip revisions */ 103enum dvma_rev { 104 dvmarev0, 105 dvmaesc1, 106 dvmarev1, 107 dvmarev2, 108 dvmarev3, 109 dvmarevplus, 110 dvmahme 111}; 112 113#define DMA_HASCOUNT(rev) ((rev)==dvmaesc1) 114 115/* Linux DMA information structure, filled during probe. */ 116struct Linux_SBus_DMA { 117 struct Linux_SBus_DMA *next; 118 struct linux_sbus_device *SBus_dev; 119 struct sparc_dma_registers *regs; 120 121 /* Status, misc info */ 122 int node; /* Prom node for this DMA device */ 123 int running; /* Are we doing DMA now? */ 124 int allocated; /* Are we "owned" by anyone yet? */ 125 126 /* Transfer information. */ 127 unsigned long addr; /* Start address of current transfer */ 128 int nbytes; /* Size of current transfer */ 129 int realbytes; /* For splitting up large transfers, etc. */ 130 131 /* DMA revision */ 132 enum dvma_rev revision; 133}; 134 135extern struct Linux_SBus_DMA *dma_chain; 136 137/* Broken hardware... */ 138#define DMA_ISBROKEN(dma) ((dma)->revision == dvmarev1) 139#define DMA_ISESC1(dma) ((dma)->revision == dvmaesc1) 140 141/* Fields in the cond_reg register */ 142/* First, the version identification bits */ 143#define DMA_DEVICE_ID 0xf0000000 /* Device identification bits */ 144#define DMA_VERS0 0x00000000 /* Sunray DMA version */ 145#define DMA_ESCV1 0x40000000 /* DMA ESC Version 1 */ 146#define DMA_VERS1 0x80000000 /* DMA rev 1 */ 147#define DMA_VERS2 0xa0000000 /* DMA rev 2 */ 148#define DMA_VERHME 0xb0000000 /* DMA hme gate array */ 149#define DMA_VERSPLUS 0x90000000 /* DMA rev 1 PLUS */ 150 151#define DMA_HNDL_INTR 0x00000001 /* An IRQ needs to be handled */ 152#define DMA_HNDL_ERROR 0x00000002 /* We need to take an error */ 153#define DMA_FIFO_ISDRAIN 0x0000000c /* The DMA FIFO is draining */ 154#define DMA_INT_ENAB 0x00000010 /* Turn on interrupts */ 155#define DMA_FIFO_INV 0x00000020 /* Invalidate the FIFO */ 156#define DMA_ACC_SZ_ERR 0x00000040 /* The access size was bad */ 157#define DMA_FIFO_STDRAIN 0x00000040 /* DMA_VERS1 Drain the FIFO */ 158#define DMA_RST_SCSI 0x00000080 /* Reset the SCSI controller */ 159#define DMA_RST_ENET DMA_RST_SCSI /* Reset the ENET controller */ 160#define DMA_ST_WRITE 0x00000100 /* write from device to memory */ 161#define DMA_ENABLE 0x00000200 /* Fire up DMA, handle requests */ 162#define DMA_PEND_READ 0x00000400 /* DMA_VERS1/0/PLUS Pending Read */ 163#define DMA_ESC_BURST 0x00000800 /* 1=16byte 0=32byte */ 164#define DMA_READ_AHEAD 0x00001800 /* DMA read ahead partial longword */ 165#define DMA_DSBL_RD_DRN 0x00001000 /* No EC drain on slave reads */ 166#define DMA_BCNT_ENAB 0x00002000 /* If on, use the byte counter */ 167#define DMA_TERM_CNTR 0x00004000 /* Terminal counter */ 168#define DMA_CSR_DISAB 0x00010000 /* No FIFO drains during csr */ 169#define DMA_SCSI_DISAB 0x00020000 /* No FIFO drains during reg */ 170#define DMA_DSBL_WR_INV 0x00020000 /* No EC inval. on slave writes */ 171#define DMA_ADD_ENABLE 0x00040000 /* Special ESC DVMA optimization */ 172#define DMA_E_BURST8 0x00040000 /* ENET: SBUS r/w burst size */ 173#define DMA_BRST_SZ 0x000c0000 /* SCSI: SBUS r/w burst size */ 174#define DMA_BRST64 0x00080000 /* SCSI: 64byte bursts (HME on UltraSparc only) */ 175#define DMA_BRST32 0x00040000 /* SCSI: 32byte bursts */ 176#define DMA_BRST16 0x00000000 /* SCSI: 16byte bursts */ 177#define DMA_BRST0 0x00080000 /* SCSI: no bursts (non-HME gate arrays) */ 178#define DMA_ADDR_DISAB 0x00100000 /* No FIFO drains during addr */ 179#define DMA_2CLKS 0x00200000 /* Each transfer = 2 clock ticks */ 180#define DMA_3CLKS 0x00400000 /* Each transfer = 3 clock ticks */ 181#define DMA_EN_ENETAUI DMA_3CLKS /* Put lance into AUI-cable mode */ 182#define DMA_CNTR_DISAB 0x00800000 /* No IRQ when DMA_TERM_CNTR set */ 183#define DMA_AUTO_NADDR 0x01000000 /* Use "auto nxt addr" feature */ 184#define DMA_SCSI_ON 0x02000000 /* Enable SCSI dma */ 185#define DMA_PARITY_OFF 0x02000000 /* HME: disable parity checking */ 186#define DMA_LOADED_ADDR 0x04000000 /* Address has been loaded */ 187#define DMA_LOADED_NADDR 0x08000000 /* Next address has been loaded */ 188 189/* Values describing the burst-size property from the PROM */ 190#define DMA_BURST1 0x01 191#define DMA_BURST2 0x02 192#define DMA_BURST4 0x04 193#define DMA_BURST8 0x08 194#define DMA_BURST16 0x10 195#define DMA_BURST32 0x20 196#define DMA_BURST64 0x40 197#define DMA_BURSTBITS 0x7f 198 199/* Determine highest possible final transfer address given a base */ 200#define DMA_MAXEND(addr) (0x01000000UL-(((unsigned long)(addr))&0x00ffffffUL)) 201 202/* Yes, I hack a lot of elisp in my spare time... */ 203#define DMA_ERROR_P(regs) ((((regs)->cond_reg) & DMA_HNDL_ERROR)) 204#define DMA_IRQ_P(regs) ((((regs)->cond_reg) & (DMA_HNDL_INTR | DMA_HNDL_ERROR))) 205#define DMA_WRITE_P(regs) ((((regs)->cond_reg) & DMA_ST_WRITE)) 206#define DMA_OFF(regs) ((((regs)->cond_reg) &= (~DMA_ENABLE))) 207#define DMA_INTSOFF(regs) ((((regs)->cond_reg) &= (~DMA_INT_ENAB))) 208#define DMA_INTSON(regs) ((((regs)->cond_reg) |= (DMA_INT_ENAB))) 209#define DMA_PUNTFIFO(regs) ((((regs)->cond_reg) |= DMA_FIFO_INV)) 210#define DMA_SETSTART(regs, addr) ((((regs)->st_addr) = (char *) addr)) 211#define DMA_BEGINDMA_W(regs) \ 212 ((((regs)->cond_reg |= (DMA_ST_WRITE|DMA_ENABLE|DMA_INT_ENAB)))) 213#define DMA_BEGINDMA_R(regs) \ 214 ((((regs)->cond_reg |= ((DMA_ENABLE|DMA_INT_ENAB)&(~DMA_ST_WRITE))))) 215 216/* For certain DMA chips, we need to disable ints upon irq entry 217 * and turn them back on when we are done. So in any ESP interrupt 218 * handler you *must* call DMA_IRQ_ENTRY upon entry and DMA_IRQ_EXIT 219 * when leaving the handler. You have been warned... 220 */ 221#define DMA_IRQ_ENTRY(dma, dregs) do { \ 222 if(DMA_ISBROKEN(dma)) DMA_INTSOFF(dregs); \ 223 } while (0) 224 225#define DMA_IRQ_EXIT(dma, dregs) do { \ 226 if(DMA_ISBROKEN(dma)) DMA_INTSON(dregs); \ 227 } while(0) 228 229/* Reset the friggin' thing... */ 230#define DMA_RESET(dma) do { \ 231 struct sparc_dma_registers *regs = dma->regs; \ 232 /* Let the current FIFO drain itself */ \ 233 sparc_dma_pause(regs, (DMA_FIFO_ISDRAIN)); \ 234 /* Reset the logic */ \ 235 regs->cond_reg |= (DMA_RST_SCSI); /* assert */ \ 236 __delay(400); /* let the bits set ;) */ \ 237 regs->cond_reg &= ~(DMA_RST_SCSI); /* de-assert */ \ 238 sparc_dma_enable_interrupts(regs); /* Re-enable interrupts */ \ 239 /* Enable FAST transfers if available */ \ 240 if(dma->revision>dvmarev1) regs->cond_reg |= DMA_3CLKS; \ 241 dma->running = 0; \ 242} while(0) 243 244 245#endif /* !CONFIG_SUN3 */ 246 247#endif /* !(__M68K_DVMA_H) */ 248