1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 /*
3 * include/asm-m68k/dma.h
4 *
5 * Copyright 1995 (C) David S. Miller (davem@c
6 *
7 * Hacked to fit Sun3x needs by Thomas Bogendo
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_SHIF
16 #define DVMA_PAGE_MASK (~(DVMA_PAGE_SIZE-1))
17 #define DVMA_PAGE_ALIGN(addr) ALIGN(addr, DV
18
19 extern void dvma_init(void);
20 extern int dvma_map_iommu(unsigned long kaddr,
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) & 0
26 #define dvma_map_align_vme(x, y, z) (dvma_map_
27 extern unsigned long dvma_map_align(unsigned l
28 int align);
29 extern void *dvma_malloc_align(unsigned long l
30
31 extern void dvma_unmap(void *baddr);
32 extern void dvma_free(void *vaddr);
33
34
35 #ifdef CONFIG_SUN3
36 /* sun3 dvma page support */
37
38 /* memory and pmegs potentially reserved for d
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
48 byte boundaries */
49 #define DVMA_REGION_SIZE 0x10000
50 #define DVMA_ALIGN(addr) (((addr)+DVMA_REGION_
51 ~(DVMA_REGION_SIZE-1)
52
53 /* virt <-> phys conversions */
54 #define dvma_vtop(x) ((unsigned long)(x) & 0xf
55 #define dvma_ptov(x) ((unsigned long)(x) | 0xf
56 #define dvma_vtovme(x) ((unsigned long)(x) & 0
57 #define dvma_vmetov(x) ((unsigned long)(x) | 0
58 #define dvma_vtob(x) dvma_vtop(x)
59 #define dvma_btov(x) dvma_ptov(x)
60
61 void sun3_dvma_init(void);
62
63 static inline int dvma_map_cpu(unsigned long k
64 int len)
65 {
66 return 0;
67 }
68
69 static inline void dvma_unmap_iommu(unsigned l
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_TOTA
81
82 #define dvma_vtob(x) ((unsigned long)(x) & 0x0
83 #define dvma_btov(x) ((unsigned long)(x) | 0xf
84
85 static inline void sun3_dvma_init(void) { }
86
87 int dvma_map_cpu(unsigned long kaddr, unsigned
88
89 void dvma_unmap_iommu(unsigned long baddr, int
90
91 /* everything below this line is specific to d
92 ESP scsi on sun3x */
93
94 /* Structure to describe the current status of
95 struct sparc_dma_registers {
96 __volatile__ unsigned long cond_reg; /* DMA
97 __volatile__ unsigned long st_addr; /* Sta
98 __volatile__ unsigned long cnt; /* How
99 __volatile__ unsigned long dma_test; /* DMA
100 };
101
102 /* DVMA chip revisions */
103 enum 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 dur
116 struct 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
123 int running; /* Are we doi
124 int allocated; /* Are we "ow
125
126 /* Transfer information. */
127 unsigned long addr; /* Start addr
128 int nbytes; /* Size of cu
129 int realbytes; /* For splitt
130
131 /* DMA revision */
132 enum dvma_rev revision;
133 };
134
135 extern struct Linux_SBus_DMA *dma_chain;
136
137 /* Broken hardware... */
138 #define DMA_ISBROKEN(dma) ((dma)->revision
139 #define DMA_ISESC1(dma) ((dma)->revision
140
141 /* Fields in the cond_reg register */
142 /* First, the version identification bits */
143 #define DMA_DEVICE_ID 0xf0000000 /*
144 #define DMA_VERS0 0x00000000 /*
145 #define DMA_ESCV1 0x40000000 /*
146 #define DMA_VERS1 0x80000000 /*
147 #define DMA_VERS2 0xa0000000 /*
148 #define DMA_VERHME 0xb0000000 /*
149 #define DMA_VERSPLUS 0x90000000 /*
150
151 #define DMA_HNDL_INTR 0x00000001 /*
152 #define DMA_HNDL_ERROR 0x00000002 /*
153 #define DMA_FIFO_ISDRAIN 0x0000000c /*
154 #define DMA_INT_ENAB 0x00000010 /*
155 #define DMA_FIFO_INV 0x00000020 /*
156 #define DMA_ACC_SZ_ERR 0x00000040 /*
157 #define DMA_FIFO_STDRAIN 0x00000040 /*
158 #define DMA_RST_SCSI 0x00000080 /*
159 #define DMA_RST_ENET DMA_RST_SCSI /*
160 #define DMA_ST_WRITE 0x00000100 /*
161 #define DMA_ENABLE 0x00000200 /*
162 #define DMA_PEND_READ 0x00000400 /*
163 #define DMA_ESC_BURST 0x00000800 /*
164 #define DMA_READ_AHEAD 0x00001800 /*
165 #define DMA_DSBL_RD_DRN 0x00001000 /*
166 #define DMA_BCNT_ENAB 0x00002000 /*
167 #define DMA_TERM_CNTR 0x00004000 /*
168 #define DMA_CSR_DISAB 0x00010000 /*
169 #define DMA_SCSI_DISAB 0x00020000 /*
170 #define DMA_DSBL_WR_INV 0x00020000 /*
171 #define DMA_ADD_ENABLE 0x00040000 /*
172 #define DMA_E_BURST8 0x00040000 /*
173 #define DMA_BRST_SZ 0x000c0000 /*
174 #define DMA_BRST64 0x00080000 /*
175 #define DMA_BRST32 0x00040000 /*
176 #define DMA_BRST16 0x00000000 /*
177 #define DMA_BRST0 0x00080000 /*
178 #define DMA_ADDR_DISAB 0x00100000 /*
179 #define DMA_2CLKS 0x00200000 /*
180 #define DMA_3CLKS 0x00400000 /*
181 #define DMA_EN_ENETAUI DMA_3CLKS /*
182 #define DMA_CNTR_DISAB 0x00800000 /*
183 #define DMA_AUTO_NADDR 0x01000000 /*
184 #define DMA_SCSI_ON 0x02000000 /*
185 #define DMA_PARITY_OFF 0x02000000 /*
186 #define DMA_LOADED_ADDR 0x04000000 /*
187 #define DMA_LOADED_NADDR 0x08000000 /*
188
189 /* Values describing the burst-size property f
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 a
200 #define DMA_MAXEND(addr) (0x01000000UL-(((unsi
201
202 /* Yes, I hack a lot of elisp in my spare time
203 #define DMA_ERROR_P(regs) ((((regs)->cond_reg
204 #define DMA_IRQ_P(regs) ((((regs)->cond_reg
205 #define DMA_WRITE_P(regs) ((((regs)->cond_reg
206 #define DMA_OFF(regs) ((((regs)->cond_reg
207 #define DMA_INTSOFF(regs) ((((regs)->cond_reg
208 #define DMA_INTSON(regs) ((((regs)->cond_reg
209 #define DMA_PUNTFIFO(regs) ((((regs)->cond_reg
210 #define DMA_SETSTART(regs, addr) ((((regs)->s
211 #define DMA_BEGINDMA_W(regs) \
212 ((((regs)->cond_reg |= (DMA_ST_WRITE|D
213 #define DMA_BEGINDMA_R(regs) \
214 ((((regs)->cond_reg |= ((DMA_ENABLE|DM
215
216 /* For certain DMA chips, we need to disable i
217 * and turn them back on when we are done. So
218 * handler you *must* call DMA_IRQ_ENTRY upon
219 * when leaving the handler. You have been wa
220 */
221 #define DMA_IRQ_ENTRY(dma, dregs) do { \
222 if(DMA_ISBROKEN(dma)) DMA_INTSOFF(dreg
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
232 /* Let the current FIFO drain itself *
233 sparc_dma_pause(regs, (DMA_FIFO_ISDRAI
234 /* Reset the logic */
235 regs->cond_reg |= (DMA_RST_SCSI);
236 __delay(400);
237 regs->cond_reg &= ~(DMA_RST_SCSI);
238 sparc_dma_enable_interrupts(regs);
239 /* Enable FAST transfers if available
240 if(dma->revision>dvmarev1) regs->cond_
241 dma->running = 0;
242 } while(0)
243
244
245 #endif /* !CONFIG_SUN3 */
246
247 #endif /* !(__M68K_DVMA_H) */
248
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