source: rtems/c/src/lib/libbsp/sparc/erc32/include/erc32.h @ 3eec211

4.104.114.84.95
Last change on this file since 3eec211 was 2700423, checked in by Joel Sherrill <joel.sherrill@…>, on 11/13/00 at 22:29:14

2000-11-13 Jiri Gaisler <jgais@…>

  • Makefile.am, configure.in, gnatsupp/Makefile.am, gnatsupp/gnatsupp.c, include/Makefile.am, include/bsp.h, start/Makefile.am, startup/Makefile.am, startup/setvec.c, wrapup/Makefile.am:
  • erc32sonic: New directory.
  • erc32sonic/Makefile.am, erc32sonic/erc32sonic.c, erc32sonic/.cvsignore: New files.
  • include/erc32.h: New file.
  • startup/boardinit.S: New file. Big update of SPARC support for ERC32 and LEON. Added support for ERC32 without floating point. Added SONIC support as configured on Tharsys ERC32 board. The bsp's share various code in the shared directory:

gnat-support, start-up code, etc.

To decrease the foot-print, I removed the 16 kbyte start-up
stack that was put in .bss and never reused once the system
was up. The stack is now put between the heap and the
workspace. To reclaim it, the user can do a rtems_region_extend
to merge the stack to the heap region once the system is up.
  • Property mode set to 100644
File size: 22.0 KB
Line 
1/*  erc32.h
2 *
3 *  This include file contains information pertaining to the ERC32.
4 *  The ERC32 is a custom SPARC V7 implementation based on the Cypress
5 *  601/602 chipset.  This CPU has a number of on-board peripherals and
6 *  was developed by the European Space Agency to target space applications.
7 *
8 *  NOTE:  Other than where absolutely required, this version currently
9 *         supports only the peripherals and bits used by the basic board
10 *         support package. This includes at least significant pieces of
11 *         the following items:
12 *
13 *           + UART Channels A and B
14 *           + General Purpose Timer
15 *           + Real Time Clock
16 *           + Watchdog Timer (so it can be disabled)
17 *           + Control Register (so powerdown mode can be enabled)
18 *           + Memory Control Register
19 *           + Interrupt Control
20 *
21 *  COPYRIGHT (c) 1989-1999.
22 *  On-Line Applications Research Corporation (OAR).
23 *
24 *  The license and distribution terms for this file may be
25 *  found in the file LICENSE in this distribution or at
26 *  http://www.OARcorp.com/rtems/license.html.
27 *
28 *  Ported to ERC32 implementation of the SPARC by On-Line Applications
29 *  Research Corporation (OAR) under contract to the European Space
30 *  Agency (ESA).
31 *
32 *  ERC32 modifications of respective RTEMS file: COPYRIGHT (c) 1995.
33 *  European Space Agency.
34 *
35 *  $Id$
36 */
37 
38#ifndef _INCLUDE_ERC32_h
39#define _INCLUDE_ERC32_h
40
41#include <rtems/score/sparc.h>
42 
43#ifdef __cplusplus
44extern "C" {
45#endif
46
47/*
48 *  Interrupt Sources
49 *
50 *  The interrupt source numbers directly map to the trap type and to
51 *  the bits used in the Interrupt Clear, Interrupt Force, Interrupt Mask,
52 *  and the Interrupt Pending Registers.
53 */
54
55#define ERC32_INTERRUPT_MASKED_ERRORS             1
56#define ERC32_INTERRUPT_EXTERNAL_1                2
57#define ERC32_INTERRUPT_EXTERNAL_2                3
58#define ERC32_INTERRUPT_UART_A_RX_TX              4
59#define ERC32_INTERRUPT_UART_B_RX_TX              5
60#define ERC32_INTERRUPT_CORRECTABLE_MEMORY_ERROR  6
61#define ERC32_INTERRUPT_UART_ERROR                7
62#define ERC32_INTERRUPT_DMA_ACCESS_ERROR          8
63#define ERC32_INTERRUPT_DMA_TIMEOUT               9
64#define ERC32_INTERRUPT_EXTERNAL_3               10
65#define ERC32_INTERRUPT_EXTERNAL_4               11
66#define ERC32_INTERRUPT_GENERAL_PURPOSE_TIMER    12
67#define ERC32_INTERRUPT_REAL_TIME_CLOCK          13
68#define ERC32_INTERRUPT_EXTERNAL_5               14
69#define ERC32_INTERRUPT_WATCHDOG_TIMEOUT         15
70
71#ifndef ASM
72
73/*
74 *  Trap Types for on-chip peripherals
75 *
76 *  Source: Table 8 - Interrupt Trap Type and Default Priority Assignments
77 *
78 *  NOTE: The priority level for each source corresponds to the least
79 *        significant nibble of the trap type.
80 */
81
82#define ERC32_TRAP_TYPE( _source ) SPARC_ASYNCHRONOUS_TRAP((_source) + 0x10)
83
84#define ERC32_TRAP_SOURCE( _trap ) ((_trap) - 0x10)
85
86#define ERC32_Is_MEC_Trap( _trap ) \
87  ( (_trap) >= ERC32_TRAP_TYPE( ERC32_INTERRUPT_MASKED_ERRORS ) && \
88    (_trap) <= ERC32_TRAP_TYPE( ERC32_INTERRUPT_WATCHDOG_TIMEOUT ) )
89
90/*
91 *  Structure for ERC32 memory mapped registers. 
92 *
93 *  Source: Section 3.25.2 - Register Address Map
94 *
95 *  NOTE:  There is only one of these structures per CPU, its base address
96 *         is 0x01f80000, and the variable MEC is placed there by the
97 *         linkcmds file.
98 */
99
100typedef struct {
101  volatile unsigned32  Control;                              /* offset 0x00 */
102  volatile unsigned32  Software_Reset;                       /* offset 0x04 */
103  volatile unsigned32  Power_Down;                           /* offset 0x08 */
104  volatile unsigned32  Unimplemented_0;                      /* offset 0x0c */
105  volatile unsigned32  Memory_Configuration;                 /* offset 0x10 */
106  volatile unsigned32  IO_Configuration;                     /* offset 0x14 */
107  volatile unsigned32  Wait_State_Configuration;             /* offset 0x18 */
108  volatile unsigned32  Unimplemented_1;                      /* offset 0x1c */
109  volatile unsigned32  Memory_Access_0;                      /* offset 0x20 */
110  volatile unsigned32  Memory_Access_1;                      /* offset 0x24 */
111  volatile unsigned32  Unimplemented_2[ 7 ];                 /* offset 0x28 */
112  volatile unsigned32  Interrupt_Shape;                      /* offset 0x44 */
113  volatile unsigned32  Interrupt_Pending;                    /* offset 0x48 */
114  volatile unsigned32  Interrupt_Mask;                       /* offset 0x4c */
115  volatile unsigned32  Interrupt_Clear;                      /* offset 0x50 */
116  volatile unsigned32  Interrupt_Force;                      /* offset 0x54 */
117  volatile unsigned32  Unimplemented_3[ 2 ];                 /* offset 0x58 */
118                                                             /* offset 0x60 */
119  volatile unsigned32  Watchdog_Program_and_Timeout_Acknowledge;
120  volatile unsigned32  Watchdog_Trap_Door_Set;               /* offset 0x64 */
121  volatile unsigned32  Unimplemented_4[ 6 ];                 /* offset 0x68 */
122  volatile unsigned32  Real_Time_Clock_Counter;              /* offset 0x80 */
123  volatile unsigned32  Real_Time_Clock_Scalar;               /* offset 0x84 */
124  volatile unsigned32  General_Purpose_Timer_Counter;        /* offset 0x88 */
125  volatile unsigned32  General_Purpose_Timer_Scalar;         /* offset 0x8c */
126  volatile unsigned32  Unimplemented_5[ 2 ];                 /* offset 0x90 */
127  volatile unsigned32  Timer_Control;                        /* offset 0x98 */
128  volatile unsigned32  Unimplemented_6;                      /* offset 0x9c */
129  volatile unsigned32  System_Fault_Status;                  /* offset 0xa0 */
130  volatile unsigned32  First_Failing_Address;                /* offset 0xa4 */
131  volatile unsigned32  First_Failing_Data;                   /* offset 0xa8 */
132  volatile unsigned32  First_Failing_Syndrome_and_Check_Bits;/* offset 0xac */
133  volatile unsigned32  Error_and_Reset_Status;               /* offset 0xb0 */
134  volatile unsigned32  Error_Mask;                           /* offset 0xb4 */
135  volatile unsigned32  Unimplemented_7[ 2 ];                 /* offset 0xb8 */
136  volatile unsigned32  Debug_Control;                        /* offset 0xc0 */
137  volatile unsigned32  Breakpoint;                           /* offset 0xc4 */
138  volatile unsigned32  Watchpoint;                           /* offset 0xc8 */
139  volatile unsigned32  Unimplemented_8;                      /* offset 0xcc */
140  volatile unsigned32  Test_Control;                         /* offset 0xd0 */
141  volatile unsigned32  Test_Data;                            /* offset 0xd4 */
142  volatile unsigned32  Unimplemented_9[ 2 ];                 /* offset 0xd8 */
143  volatile unsigned32  UART_Channel_A;                       /* offset 0xe0 */
144  volatile unsigned32  UART_Channel_B;                       /* offset 0xe4 */
145  volatile unsigned32  UART_Status;                          /* offset 0xe8 */
146} ERC32_Register_Map;
147
148#endif
149
150/*
151 *  The following constants are intended to be used ONLY in assembly
152 *  language files.
153 *
154 *  NOTE:  The intended style of usage is to load the address of MEC
155 *         into a register and then use these as displacements from
156 *         that register.
157 */
158
159#ifdef ASM
160
161#define  ERC32_MEC_CONTROL_OFFSET                                  0x00
162#define  ERC32_MEC_SOFTWARE_RESET_OFFSET                           0x04
163#define  ERC32_MEC_POWER_DOWN_OFFSET                               0x08
164#define  ERC32_MEC_UNIMPLEMENTED_0_OFFSET                          0x0C
165#define  ERC32_MEC_MEMORY_CONFIGURATION_OFFSET                     0x10
166#define  ERC32_MEC_IO_CONFIGURATION_OFFSET                         0x14
167#define  ERC32_MEC_WAIT_STATE_CONFIGURATION_OFFSET                 0x18
168#define  ERC32_MEC_UNIMPLEMENTED_1_OFFSET                          0x1C
169#define  ERC32_MEC_MEMORY_ACCESS_0_OFFSET                          0x20
170#define  ERC32_MEC_MEMORY_ACCESS_1_OFFSET                          0x24
171#define  ERC32_MEC_UNIMPLEMENTED_2_OFFSET                          0x28
172#define  ERC32_MEC_INTERRUPT_SHAPE_OFFSET                          0x44
173#define  ERC32_MEC_INTERRUPT_PENDING_OFFSET                        0x48
174#define  ERC32_MEC_INTERRUPT_MASK_OFFSET                           0x4C
175#define  ERC32_MEC_INTERRUPT_CLEAR_OFFSET                          0x50
176#define  ERC32_MEC_INTERRUPT_FORCE_OFFSET                          0x54
177#define  ERC32_MEC_UNIMPLEMENTED_3_OFFSET                          0x58
178#define  ERC32_MEC_WATCHDOG_PROGRAM_AND_TIMEOUT_ACKNOWLEDGE_OFFSET 0x60
179#define  ERC32_MEC_WATCHDOG_TRAP_DOOR_SET_OFFSET                   0x64
180#define  ERC32_MEC_UNIMPLEMENTED_4_OFFSET                          0x6C
181#define  ERC32_MEC_REAL_TIME_CLOCK_COUNTER_OFFSET                  0x80
182#define  ERC32_MEC_REAL_TIME_CLOCK_SCALAR_OFFSET                   0x84
183#define  ERC32_MEC_GENERAL_PURPOSE_TIMER_COUNTER_OFFSET            0x88
184#define  ERC32_MEC_GENERAL_PURPOSE_TIMER_SCALAR_OFFSET             0x8C
185#define  ERC32_MEC_UNIMPLEMENTED_5_OFFSET                          0x90
186#define  ERC32_MEC_TIMER_CONTROL_OFFSET                            0x98
187#define  ERC32_MEC_UNIMPLEMENTED_6_OFFSET                          0x9C
188#define  ERC32_MEC_SYSTEM_FAULT_STATUS_OFFSET                      0xA0
189#define  ERC32_MEC_FIRST_FAILING_ADDRESS_OFFSET                    0xA4
190#define  ERC32_MEC_FIRST_FAILING_DATA_OFFSET                       0xA8
191#define  ERC32_MEC_FIRST_FAILING_SYNDROME_AND_CHECK_BITS_OFFSET    0xAC
192#define  ERC32_MEC_ERROR_AND_RESET_STATUS_OFFSET                   0xB0
193#define  ERC32_MEC_ERROR_MASK_OFFSET                               0xB4
194#define  ERC32_MEC_UNIMPLEMENTED_7_OFFSET                          0xB8
195#define  ERC32_MEC_DEBUG_CONTROL_OFFSET                            0xC0
196#define  ERC32_MEC_BREAKPOINT_OFFSET                               0xC4
197#define  ERC32_MEC_WATCHPOINT_OFFSET                               0xC8
198#define  ERC32_MEC_UNIMPLEMENTED_8_OFFSET                          0xCC
199#define  ERC32_MEC_TEST_CONTROL_OFFSET                             0xD0
200#define  ERC32_MEC_TEST_DATA_OFFSET                                0xD4
201#define  ERC32_MEC_UNIMPLEMENTED_9_OFFSET                          0xD8
202#define  ERC32_MEC_UART_CHANNEL_A_OFFSET                           0xE0
203#define  ERC32_MEC_UART_CHANNEL_B_OFFSET                           0xE4
204#define  ERC32_MEC_UART_STATUS_OFFSET                              0xE8
205
206#endif
207
208/*
209 *  The following defines the bits in the Configuration Register.
210 */
211
212#define ERC32_CONFIGURATION_POWER_DOWN_MASK               0x00000001
213#define ERC32_CONFIGURATION_POWER_DOWN_ALLOWED            0x00000001
214#define ERC32_CONFIGURATION_POWER_DOWN_DISABLED           0x00000000
215
216#define ERC32_CONFIGURATION_SOFTWARE_RESET_MASK           0x00000002
217#define ERC32_CONFIGURATION_SOFTWARE_RESET_ALLOWED        0x00000002
218#define ERC32_CONFIGURATION_SOFTWARE_RESET_DISABLED       0x00000000
219
220#define ERC32_CONFIGURATION_BUS_TIMEOUT_MASK              0x00000004
221#define ERC32_CONFIGURATION_BUS_TIMEOUT_ENABLED           0x00000004
222#define ERC32_CONFIGURATION_BUS_TIMEOUT_DISABLED          0x00000000
223
224#define ERC32_CONFIGURATION_ACCESS_PROTECTION_MASK        0x00000008
225#define ERC32_CONFIGURATION_ACCESS_PROTECTION_ENABLED     0x00000008
226#define ERC32_CONFIGURATION_ACCESS_PROTECTION_DISABLED    0x00000000
227
228
229/*
230 *  The following defines the bits in the Memory Configuration Register.
231 */
232
233#define ERC32_MEMORY_CONFIGURATION_RAM_SIZE_MASK  0x00001C00
234#define ERC32_MEMORY_CONFIGURATION_RAM_SIZE_256K  ( 0 << 10 )
235#define ERC32_MEMORY_CONFIGURATION_RAM_SIZE_512K  ( 1 << 10 )
236#define ERC32_MEMORY_CONFIGURATION_RAM_SIZE_1MB   ( 2 << 10 )
237#define ERC32_MEMORY_CONFIGURATION_RAM_SIZE_2MB   ( 3 << 10 )
238#define ERC32_MEMORY_CONFIGURATION_RAM_SIZE_4MB   ( 4 << 10 )
239#define ERC32_MEMORY_CONFIGURATION_RAM_SIZE_8MB   ( 5 << 10 )
240#define ERC32_MEMORY_CONFIGURATION_RAM_SIZE_16MB  ( 6 << 10 )
241#define ERC32_MEMORY_CONFIGURATION_RAM_SIZE_32MB  ( 7 << 10 )
242
243#define ERC32_MEMORY_CONFIGURATION_PROM_SIZE_MASK  0x001C0000
244#define ERC32_MEMORY_CONFIGURATION_PROM_SIZE_128K    ( 0 << 18 )
245#define ERC32_MEMORY_CONFIGURATION_PROM_SIZE_256K    ( 1 << 18 )
246#define ERC32_MEMORY_CONFIGURATION_PROM_SIZE_512K   ( 2 << 18 )
247#define ERC32_MEMORY_CONFIGURATION_PROM_SIZE_1M   ( 3 << 18 )
248#define ERC32_MEMORY_CONFIGURATION_PROM_SIZE_2M   ( 4 << 18 )
249#define ERC32_MEMORY_CONFIGURATION_PROM_SIZE_4M  ( 5 << 18 )
250#define ERC32_MEMORY_CONFIGURATION_PROM_SIZE_8M  ( 6 << 18 )
251#define ERC32_MEMORY_CONFIGURATION_PROM_SIZE_16M  ( 7 << 18 )
252 
253/*
254 *  The following defines the bits in the Timer Control Register.
255 */
256
257#define ERC32_MEC_TIMER_CONTROL_GCR    0x00000001  /* 1 = reload at 0 */
258                                               /* 0 = stop at 0 */
259#define ERC32_MEC_TIMER_CONTROL_GCL    0x00000002  /* 1 = load and start */
260                                               /* 0 = no function */
261#define ERC32_MEC_TIMER_CONTROL_GSE    0x00000004  /* 1 = enable counting */
262                                               /* 0 = hold scalar and counter */
263#define ERC32_MEC_TIMER_CONTROL_GSL    0x00000008  /* 1 = load scalar and start */
264                                               /* 0 = no function */
265
266#define ERC32_MEC_TIMER_CONTROL_RTCCR  0x00000100  /* 1 = reload at 0 */
267                                               /* 0 = stop at 0 */
268#define ERC32_MEC_TIMER_CONTROL_RTCCL  0x00000200  /* 1 = load and start */
269                                               /* 0 = no function */
270#define ERC32_MEC_TIMER_CONTROL_RTCSE  0x00000400  /* 1 = enable counting */
271                                               /* 0 = hold scalar and counter */
272#define ERC32_MEC_TIMER_CONTROL_RTCSL  0x00000800  /* 1 = load scalar and start */
273                                               /* 0 = no function */
274
275/*
276 *  The following defines the bits in the UART Control Registers.
277 *
278 */
279
280#define ERC32_MEC_UART_CONTROL_RTD  0x000000FF /* RX/TX data */
281 
282/*
283 *  The following defines the bits in the MEC UART Control Registers.
284 */
285
286#define ERC32_MEC_UART_STATUS_DR   0x00000001 /* Data Ready */
287#define ERC32_MEC_UART_STATUS_TSE  0x00000002 /* TX Send Register Empty */
288#define ERC32_MEC_UART_STATUS_THE  0x00000004 /* TX Hold Register Empty */
289#define ERC32_MEC_UART_STATUS_FE   0x00000010 /* RX Framing Error */
290#define ERC32_MEC_UART_STATUS_PE   0x00000020 /* RX Parity Error */
291#define ERC32_MEC_UART_STATUS_OE   0x00000040 /* RX Overrun Error */
292#define ERC32_MEC_UART_STATUS_CU   0x00000080 /* Clear Errors */
293#define ERC32_MEC_UART_STATUS_TXE  0x00000006 /* TX Empty */
294#define ERC32_MEC_UART_STATUS_CLRA 0x00000080 /* Clear UART A */
295#define ERC32_MEC_UART_STATUS_CLRB 0x00800000 /* Clear UART B */
296#define ERC32_MEC_UART_STATUS_ERRA 0x00000070 /* Error in UART A */
297#define ERC32_MEC_UART_STATUS_ERRB 0x00700000 /* Error in UART B */
298
299#define ERC32_MEC_UART_STATUS_DRA   (ERC32_MEC_UART_STATUS_DR  << 0)
300#define ERC32_MEC_UART_STATUS_TSEA  (ERC32_MEC_UART_STATUS_TSE << 0)
301#define ERC32_MEC_UART_STATUS_THEA  (ERC32_MEC_UART_STATUS_THE << 0)
302#define ERC32_MEC_UART_STATUS_FEA   (ERC32_MEC_UART_STATUS_FE  << 0)
303#define ERC32_MEC_UART_STATUS_PEA   (ERC32_MEC_UART_STATUS_PE  << 0)
304#define ERC32_MEC_UART_STATUS_OEA   (ERC32_MEC_UART_STATUS_OE  << 0)
305#define ERC32_MEC_UART_STATUS_CUA   (ERC32_MEC_UART_STATUS_CU  << 0)
306#define ERC32_MEC_UART_STATUS_TXEA  (ERC32_MEC_UART_STATUS_TXE << 0)
307
308#define ERC32_MEC_UART_STATUS_DRB   (ERC32_MEC_UART_STATUS_DR  << 16)
309#define ERC32_MEC_UART_STATUS_TSEB  (ERC32_MEC_UART_STATUS_TSE << 16)
310#define ERC32_MEC_UART_STATUS_THEB  (ERC32_MEC_UART_STATUS_THE << 16)
311#define ERC32_MEC_UART_STATUS_FEB   (ERC32_MEC_UART_STATUS_FE  << 16)
312#define ERC32_MEC_UART_STATUS_PEB   (ERC32_MEC_UART_STATUS_PE  << 16)
313#define ERC32_MEC_UART_STATUS_OEB   (ERC32_MEC_UART_STATUS_OE  << 16)
314#define ERC32_MEC_UART_STATUS_CUB   (ERC32_MEC_UART_STATUS_CU  << 16)
315#define ERC32_MEC_UART_STATUS_TXEB  (ERC32_MEC_UART_STATUS_TXE << 16)
316
317#ifndef ASM
318
319/*
320 *  This is used to manipulate the on-chip registers.
321 *
322 *  The following symbol must be defined in the linkcmds file and point
323 *  to the correct location.
324 */
325
326extern ERC32_Register_Map ERC32_MEC;
327 
328/*
329 *  Macros to manipulate the Interrupt Clear, Interrupt Force, Interrupt Mask,
330 *  and the Interrupt Pending Registers.
331 *
332 *  NOTE: For operations which are not atomic, this code disables interrupts
333 *        to guarantee there are no intervening accesses to the same register.
334 *        The operations which read the register, modify the value and then
335 *        store the result back are vulnerable.
336 */
337
338#define ERC32_Clear_interrupt( _source ) \
339  do { \
340    ERC32_MEC.Interrupt_Clear = (1 << (_source)); \
341  } while (0)
342
343#define ERC32_Force_interrupt( _source ) \
344  do { \
345    unsigned32 _level; \
346    \
347    _level = sparc_disable_interrupts(); \
348    ERC32_MEC.Test_Control = ERC32_MEC.Test_Control | 0x80000; \
349    ERC32_MEC.Interrupt_Force = (1 << (_source)); \
350    sparc_enable_interrupts( _level ); \
351  } while (0)
352 
353#define ERC32_Is_interrupt_pending( _source ) \
354  (ERC32_MEC.Interrupt_Pending & (1 << (_source)))
355 
356#define ERC32_Is_interrupt_masked( _source ) \
357  (ERC32_MEC.Interrupt_Masked & (1 << (_source)))
358 
359#define ERC32_Mask_interrupt( _source ) \
360  do { \
361    unsigned32 _level; \
362    \
363    _level = sparc_disable_interrupts(); \
364      ERC32_MEC.Interrupt_Mask |= (1 << (_source)); \
365    sparc_enable_interrupts( _level ); \
366  } while (0)
367 
368#define ERC32_Unmask_interrupt( _source ) \
369  do { \
370    unsigned32 _level; \
371    \
372    _level = sparc_disable_interrupts(); \
373      ERC32_MEC.Interrupt_Mask &= ~(1 << (_source)); \
374    sparc_enable_interrupts( _level ); \
375  } while (0)
376
377#define ERC32_Disable_interrupt( _source, _previous ) \
378  do { \
379    unsigned32 _level; \
380    unsigned32 _mask = 1 << (_source); \
381    \
382    _level = sparc_disable_interrupts(); \
383      (_previous) = ERC32_MEC.Interrupt_Mask; \
384      ERC32_MEC.Interrupt_Mask = _previous | _mask; \
385    sparc_enable_interrupts( _level ); \
386    (_previous) &= _mask; \
387  } while (0)
388 
389#define ERC32_Restore_interrupt( _source, _previous ) \
390  do { \
391    unsigned32 _level; \
392    unsigned32 _mask = 1 << (_source); \
393    \
394    _level = sparc_disable_interrupts(); \
395      ERC32_MEC.Interrupt_Mask = \
396        (ERC32_MEC.Interrupt_Mask & ~_mask) | (_previous); \
397    sparc_enable_interrupts( _level ); \
398  } while (0)
399
400/*
401 *  The following macros attempt to hide the fact that the General Purpose
402 *  Timer and Real Time Clock Timer share the Timer Control Register.  Because
403 *  the Timer Control Register is write only, we must mirror it in software
404 *  and insure that writes to one timer do not alter the current settings
405 *  and status of the other timer.
406 *
407 *  This code promotes the view that the two timers are completely independent.
408 *  By exclusively using the routines below to access the Timer Control
409 *  Register, the application can view the system as having a General Purpose
410 *  Timer Control Register and a Real Time Clock Timer Control Register
411 *  rather than the single shared value.
412 *
413 *  Each logical timer control register is organized as follows:
414 *
415 *    D0 - Counter Reload
416 *          1 = reload counter at zero and restart
417 *          0 = stop counter at zero
418 *
419 *    D1 - Counter Load
420 *          1 = load counter with preset value and restart
421 *          0 = no function
422 *
423 *    D2 - Enable
424 *          1 = enable counting
425 *          0 = hold scaler and counter
426 *
427 *    D3 - Scaler Load
428 *          1 = load scalar with preset value and restart
429 *          0 = no function
430 *
431 *  To insure the management of the mirror is atomic, we disable interrupts
432 *  around updates.
433 */
434
435#define ERC32_MEC_TIMER_COUNTER_RELOAD_AT_ZERO     0x00000001
436#define ERC32_MEC_TIMER_COUNTER_STOP_AT_ZERO       0x00000000
437
438#define ERC32_MEC_TIMER_COUNTER_LOAD_COUNTER       0x00000002
439
440#define ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING    0x00000004
441#define ERC32_MEC_TIMER_COUNTER_DISABLE_COUNTING   0x00000000
442
443#define ERC32_MEC_TIMER_COUNTER_LOAD_SCALER        0x00000008
444
445#define ERC32_MEC_TIMER_COUNTER_RELOAD_MASK        0x00000001
446#define ERC32_MEC_TIMER_COUNTER_ENABLE_MASK        0x00000004
447
448#define ERC32_MEC_TIMER_COUNTER_DEFINED_MASK       0x0000000F
449#define ERC32_MEC_TIMER_COUNTER_CURRENT_MODE_MASK  0x00000005
450
451SCORE_EXTERN unsigned32 _ERC32_MEC_Timer_Control_Mirror;
452
453/*
454 *  This macros manipulate the General Purpose Timer portion of the
455 *  Timer Control register and promote the view that there are actually
456 *  two independent Timer Control Registers.
457 */
458
459#define ERC32_MEC_Set_General_Purpose_Timer_Control( _value ) \
460  do { \
461    unsigned32 _level; \
462    unsigned32 _control; \
463    unsigned32 __value; \
464    \
465    __value = ((_value) & 0x0f); \
466    _level = sparc_disable_interrupts(); \
467      _control = _ERC32_MEC_Timer_Control_Mirror; \
468      _control &= ERC32_MEC_TIMER_COUNTER_DEFINED_MASK << 8; \
469      _ERC32_MEC_Timer_Control_Mirror = _control | _value; \
470      _control &= (ERC32_MEC_TIMER_COUNTER_CURRENT_MODE_MASK << 8); \
471      _control |= __value; \
472      /* printf( "GPT 0x%x 0x%x 0x%x\n", _value, __value, _control );  */ \
473      ERC32_MEC.Timer_Control = _control; \
474    sparc_enable_interrupts( _level ); \
475  } while ( 0 )
476
477#define ERC32_MEC_Get_General_Purpose_Timer_Control( _value ) \
478  do { \
479    (_value) = _ERC32_MEC_Timer_Control_Mirror & 0xf; \
480  } while ( 0 )
481
482/*
483 *  This macros manipulate the Real Timer Clock Timer portion of the
484 *  Timer Control register and promote the view that there are actually
485 *  two independent Timer Control Registers.
486 */
487 
488#define ERC32_MEC_Set_Real_Time_Clock_Timer_Control( _value ) \
489  do { \
490    unsigned32 _level; \
491    unsigned32 _control; \
492    unsigned32 __value; \
493    \
494    __value = ((_value) & 0x0f) << 8; \
495    _level = sparc_disable_interrupts(); \
496      _control = _ERC32_MEC_Timer_Control_Mirror; \
497      _control &= ERC32_MEC_TIMER_COUNTER_DEFINED_MASK; \
498      _ERC32_MEC_Timer_Control_Mirror = _control | __value; \
499      _control &= ERC32_MEC_TIMER_COUNTER_CURRENT_MODE_MASK; \
500      _control |= __value; \
501      /* printf( "RTC 0x%x 0x%x 0x%x\n", _value, __value, _control ); */ \
502      ERC32_MEC.Timer_Control = _control; \
503    sparc_enable_interrupts( _level ); \
504  } while ( 0 )
505 
506#define ERC32_MEC_Get_Real_Time_Clock_Timer_Control( _value ) \
507  do { \
508    (_value) = (_ERC32_MEC_Timer_Control_Mirror >> 8) & 0xf; \
509  } while ( 0 )
510
511
512#endif /* !ASM */
513
514#ifdef __cplusplus
515}
516#endif
517 
518#endif /* !_INCLUDE_ERC32_h */
519/* end of include file */
520
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