2 * Local copy of include/asm-sparc/dma.h
4 * Copyright 1995 (C) David S. Miller (davem@caip.rutgers.edu)
7 #ifndef _ASM_SPARC_DMA_H
8 #define _ASM_SPARC_DMA_H
10 /* #include <linux/kernel.h> */
11 /* #include <linux/types.h> */
12 typedef unsigned int __u32;
14 /* These are irrelevant for Sparc DMA, but we leave it in so that
17 #define MAX_DMA_CHANNELS 8
18 #define MAX_DMA_ADDRESS (~0UL)
19 #define DMA_MODE_READ 1
20 #define DMA_MODE_WRITE 2
22 /* Useful constants */
23 #define SIZE_16MB (16*1024*1024)
24 #define SIZE_64K (64*1024)
26 /* Structure to describe the current status of DMA registers on the Sparc */
27 struct sparc_dma_registers {
28 __volatile__ __u32 cond_reg; /* DMA condition register */
29 __volatile__ __u32 st_addr; /* Start address of this transfer */
30 __volatile__ __u32 cnt; /* How many bytes to transfer */
31 __volatile__ __u32 dma_test; /* DMA test register */
34 /* DVMA chip revisions */
45 #define DMA_HASCOUNT(rev) ((rev)==dvmaesc1)
48 /* Linux DMA information structure, filled during probe. */
49 struct Linux_SBus_DMA {
50 struct Linux_SBus_DMA *next;
51 struct linux_sbus_device *SBus_dev;
52 struct sparc_dma_registers *regs;
54 /* Status, misc info */
55 int node; /* Prom node for this DMA device */
56 int running; /* Are we doing DMA now? */
57 int allocated; /* Are we "owned" by anyone yet? */
59 /* Transfer information. */
60 unsigned long addr; /* Start address of current transfer */
61 int nbytes; /* Size of current transfer */
62 int realbytes; /* For splitting up large transfers, etc. */
65 enum dvma_rev revision;
68 extern struct Linux_SBus_DMA *dma_chain;
71 /* Broken hardware... */
72 /* Have to sort this out. Does rev0 work fine on sun4[cmd] without isbroken?
73 * Or is rev0 present only on sun4 boxes? -jj */
74 #define DMA_ISBROKEN(dma) ((dma)->revision == dvmarev0 || (dma)->revision == dvmarev1)
75 #define DMA_ISESC1(dma) ((dma)->revision == dvmaesc1)
77 /* Fields in the cond_reg register */
78 /* First, the version identification bits */
79 #define DMA_DEVICE_ID 0xf0000000 /* Device identification bits */
80 #define DMA_VERS0 0x00000000 /* Sunray DMA version */
81 #define DMA_ESCV1 0x40000000 /* DMA ESC Version 1 */
82 #define DMA_VERS1 0x80000000 /* DMA rev 1 */
83 #define DMA_VERS2 0xa0000000 /* DMA rev 2 */
84 #define DMA_VERHME 0xb0000000 /* DMA hme gate array */
85 #define DMA_VERSPLUS 0x90000000 /* DMA rev 1 PLUS */
87 #define DMA_HNDL_INTR 0x00000001 /* An IRQ needs to be handled */
88 #define DMA_HNDL_ERROR 0x00000002 /* We need to take an error */
89 #define DMA_FIFO_ISDRAIN 0x0000000c /* The DMA FIFO is draining */
90 #define DMA_INT_ENAB 0x00000010 /* Turn on interrupts */
91 #define DMA_FIFO_INV 0x00000020 /* Invalidate the FIFO */
92 #define DMA_ACC_SZ_ERR 0x00000040 /* The access size was bad */
93 #define DMA_FIFO_STDRAIN 0x00000040 /* DMA_VERS1 Drain the FIFO */
94 #define DMA_RST_SCSI 0x00000080 /* Reset the SCSI controller */
95 #define DMA_RST_ENET DMA_RST_SCSI /* Reset the ENET controller */
96 #define DMA_ST_WRITE 0x00000100 /* write from device to memory */
97 #define DMA_ENABLE 0x00000200 /* Fire up DMA, handle requests */
98 #define DMA_PEND_READ 0x00000400 /* DMA_VERS1/0/PLUS Pending Read */
99 #define DMA_ESC_BURST 0x00000800 /* 1=16byte 0=32byte */
100 #define DMA_READ_AHEAD 0x00001800 /* DMA read ahead partial longword */
101 #define DMA_DSBL_RD_DRN 0x00001000 /* No EC drain on slave reads */
102 #define DMA_BCNT_ENAB 0x00002000 /* If on, use the byte counter */
103 #define DMA_TERM_CNTR 0x00004000 /* Terminal counter */
104 #define DMA_SCSI_SBUS64 0x00008000 /* HME: Enable 64-bit SBUS mode. */
105 #define DMA_CSR_DISAB 0x00010000 /* No FIFO drains during csr */
106 #define DMA_SCSI_DISAB 0x00020000 /* No FIFO drains during reg */
107 #define DMA_DSBL_WR_INV 0x00020000 /* No EC inval. on slave writes */
108 #define DMA_ADD_ENABLE 0x00040000 /* Special ESC DVMA optimization */
109 #define DMA_E_BURST8 0x00040000 /* ENET: SBUS r/w burst size */
110 #define DMA_BRST_SZ 0x000c0000 /* SCSI: SBUS r/w burst size */
111 #define DMA_BRST64 0x00080000 /* SCSI: 64byte bursts (HME on UltraSparc only) */
112 #define DMA_BRST32 0x00040000 /* SCSI: 32byte bursts */
113 #define DMA_BRST16 0x00000000 /* SCSI: 16byte bursts */
114 #define DMA_BRST0 0x00080000 /* SCSI: no bursts (non-HME gate arrays) */
115 #define DMA_ADDR_DISAB 0x00100000 /* No FIFO drains during addr */
116 #define DMA_2CLKS 0x00200000 /* Each transfer = 2 clock ticks */
117 #define DMA_3CLKS 0x00400000 /* Each transfer = 3 clock ticks */
118 #define DMA_EN_ENETAUI DMA_3CLKS /* Put lance into AUI-cable mode */
119 #define DMA_CNTR_DISAB 0x00800000 /* No IRQ when DMA_TERM_CNTR set */
120 #define DMA_AUTO_NADDR 0x01000000 /* Use "auto nxt addr" feature */
121 #define DMA_SCSI_ON 0x02000000 /* Enable SCSI dma */
122 #define DMA_PARITY_OFF 0x02000000 /* HME: disable parity checking */
123 #define DMA_LOADED_ADDR 0x04000000 /* Address has been loaded */
124 #define DMA_LOADED_NADDR 0x08000000 /* Next address has been loaded */
125 #define DMA_RESET_FAS366 0x08000000 /* HME: Assert RESET to FAS366 */
127 /* Values describing the burst-size property from the PROM */
128 #define DMA_BURST1 0x01
129 #define DMA_BURST2 0x02
130 #define DMA_BURST4 0x04
131 #define DMA_BURST8 0x08
132 #define DMA_BURST16 0x10
133 #define DMA_BURST32 0x20
134 #define DMA_BURST64 0x40
135 #define DMA_BURSTBITS 0x7f
137 /* Determine highest possible final transfer address given a base */
138 #define DMA_MAXEND(addr) (0x01000000UL-(((unsigned long)(addr))&0x00ffffffUL))
140 /* Yes, I hack a lot of elisp in my spare time... */
141 #define DMA_ERROR_P(regs) ((((regs)->cond_reg) & DMA_HNDL_ERROR))
142 #define DMA_IRQ_P(regs) ((((regs)->cond_reg) & (DMA_HNDL_INTR | DMA_HNDL_ERROR)))
143 #define DMA_WRITE_P(regs) ((((regs)->cond_reg) & DMA_ST_WRITE))
144 #define DMA_OFF(regs) ((((regs)->cond_reg) &= (~DMA_ENABLE)))
145 #define DMA_INTSOFF(regs) ((((regs)->cond_reg) &= (~DMA_INT_ENAB)))
146 #define DMA_INTSON(regs) ((((regs)->cond_reg) |= (DMA_INT_ENAB)))
147 #define DMA_PUNTFIFO(regs) ((((regs)->cond_reg) |= DMA_FIFO_INV))
148 #define DMA_SETSTART(regs, addr) ((((regs)->st_addr) = (char *) addr))
149 #define DMA_BEGINDMA_W(regs) \
150 ((((regs)->cond_reg |= (DMA_ST_WRITE|DMA_ENABLE|DMA_INT_ENAB))))
151 #define DMA_BEGINDMA_R(regs) \
152 ((((regs)->cond_reg |= ((DMA_ENABLE|DMA_INT_ENAB)&(~DMA_ST_WRITE)))))
156 /* For certain DMA chips, we need to disable ints upon irq entry
157 * and turn them back on when we are done. So in any ESP interrupt
158 * handler you *must* call DMA_IRQ_ENTRY upon entry and DMA_IRQ_EXIT
159 * when leaving the handler. You have been warned...
161 #define DMA_IRQ_ENTRY(dma, dregs) do { \
162 if(DMA_ISBROKEN(dma)) DMA_INTSOFF(dregs); \
165 #define DMA_IRQ_EXIT(dma, dregs) do { \
166 if(DMA_ISBROKEN(dma)) DMA_INTSON(dregs); \
170 /* Pause until counter runs out or BIT isn't set in the DMA condition
173 extern __inline__ void sparc_dma_pause(struct sparc_dma_registers *regs,
176 int ctr = 50000; /* Let's find some bugs ;) */
178 /* Busy wait until the bit is not set any more */
179 while((regs->cond_reg&bit) && (ctr>0)) {
184 /* Check for bogus outcome. */
186 panic("DMA timeout");
189 /* Reset the friggin' thing... */
190 #define DMA_RESET(dma) do { \
191 struct sparc_dma_registers *regs = dma->regs; \
192 /* Let the current FIFO drain itself */ \
193 sparc_dma_pause(regs, (DMA_FIFO_ISDRAIN)); \
194 /* Reset the logic */ \
195 regs->cond_reg |= (DMA_RST_SCSI); /* assert */ \
196 __delay(400); /* let the bits set ;) */ \
197 regs->cond_reg &= ~(DMA_RST_SCSI); /* de-assert */ \
198 sparc_dma_enable_interrupts(regs); /* Re-enable interrupts */ \
199 /* Enable FAST transfers if available */ \
200 if(dma->revision>dvmarev1) regs->cond_reg |= DMA_3CLKS; \
204 #define for_each_dvma(dma) \
205 for((dma) = dma_chain; (dma); (dma) = (dma)->next)
207 extern int get_dma_list(char *);
208 extern int request_dma(unsigned int, __const__ char *);
209 extern void free_dma(unsigned int);
213 #endif /* !(_ASM_SPARC_DMA_H) */