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