source: rtems/c/src/lib/libbsp/powerpc/haleakala/startup/bspstart.c @ 574fb67

4.104.114.9
Last change on this file since 574fb67 was 574fb67, checked in by Thomas Doerfler <Thomas.Doerfler@…>, on Jul 14, 2008 at 4:15:28 PM

updated gen83xx BSP
updated haleakala BSP
added MPC55xx BSP

  • Property mode set to 100644
File size: 8.0 KB
Line 
1/*  bsp_start()
2 *
3 *  This routine starts the application.  It includes application,
4 *  board, and monitor specific initialization and configuration.
5 *  The generic CPU dependent initialization has been performed
6 *  before this routine is invoked.
7 *
8 *  INPUT:  NONE
9 *
10 *  OUTPUT: NONE
11 *
12 *  Author:     Thomas Doerfler <td@imd.m.isar.de>
13 *              IMD Ingenieurbuero fuer Microcomputertechnik
14 *
15 *  COPYRIGHT (c) 1998 by IMD
16 *
17 *  Changes from IMD are covered by the original distributions terms.
18 *  This file has been derived from the papyrus BSP:
19 *
20 *  Author:     Andrew Bray <andy@i-cubed.co.uk>
21 *
22 *  COPYRIGHT (c) 1995 by i-cubed ltd.
23 *
24 *  To anyone who acknowledges that this file is provided "AS IS"
25 *  without any express or implied warranty:
26 *      permission to use, copy, modify, and distribute this file
27 *      for any purpose is hereby granted without fee, provided that
28 *      the above copyright notice and this notice appears in all
29 *      copies, and that the name of i-cubed limited not be used in
30 *      advertising or publicity pertaining to distribution of the
31 *      software without specific, written prior permission.
32 *      i-cubed limited makes no representations about the suitability
33 *      of this software for any purpose.
34 *
35 *  Modifications for spooling console driver and control of memory layout
36 *  with linker command file by
37 *              Thomas Doerfler <td@imd.m.isar.de>
38 *  for these modifications:
39 *  COPYRIGHT (c) 1997 by IMD, Puchheim, Germany.
40 *
41 *  To anyone who acknowledges that this file is provided "AS IS"
42 *  without any express or implied warranty:
43 *      permission to use, copy, modify, and distribute this file
44 *      for any purpose is hereby granted without fee, provided that
45 *      the above copyright notice and this notice appears in all
46 *      copies. IMD makes no representations about the suitability
47 *      of this software for any purpose.
48 *
49 *  Derived from c/src/lib/libbsp/no_cpu/no_bsp/startup/bspstart.c:
50 *
51 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
52 *  On-Line Applications Research Corporation (OAR).
53 *
54 *  Modifications for PPC405GP by Dennis Ehlin
55 *
56 *  Further modified for the PPC405EX Haleakala board by
57 *  Michael Hamel ADInstruments Ltd May 2008
58 *
59 *  $Id$
60 */
61#include <string.h>
62#include <fcntl.h>
63
64#include <bsp.h>
65#include <bsp/uart.h>
66#include <rtems/libio.h>
67#include <rtems/libcsupport.h>
68#include <bsp/irq.h>
69#include <rtems/bspIo.h>
70#include <libcpu/cpuIdent.h>
71#include <rtems/powerpc/powerpc.h>
72#include <bsp/ppc_exc_bspsupp.h>
73#include <ppc4xx/ppc405gp.h>
74#include <ppc4xx/ppc405ex.h>
75
76#include <stdio.h>
77
78/*
79 *  Driver configuration parameters
80 */
81
82/* Expected by clock.c */
83uint32_t        bsp_clicks_per_usec;
84boolean         bsp_timer_internal_clock;   /* TRUE, when timer runs with CPU clk */
85uint32_t        bsp_timer_least_valid;
86uint32_t        bsp_timer_average_overhead;
87
88
89/*      Initialize whatever libc we are using
90 *      called from postdriver hook
91 */
92
93void bsp_postdriver_hook(void);
94void bsp_libc_init( void *, uint32_t, int );
95
96/*
97 *
98 *  bsp_predriver_hook
99 *
100 *  Before drivers are setup.
101 */
102
103void bsp_predriver_hook(void)
104{
105 
106}
107
108/*
109 *  Function:   bsp_pretasking_hook
110 *  Created:    95/03/10
111 *
112 *  Description:
113 *      BSP pretasking hook.  Called just before drivers are initialized.
114 *      Used to setup libc and install any BSP extensions.
115 *
116 *  NOTES:
117 *      Must not use libc (to do io) from here, since drivers are
118 *      not yet initialized.
119 *
120 */
121
122
123extern uint8_t  _RAMEnd;                /* Defined in linkcmds */
124
125void bsp_pretasking_hook(void)
126/* Initialise libc with the address and size of the heap, which runs
127   from the end of the RTEMS workspace to the top of RAM */
128{
129    uint32_t heap_start;
130 
131    heap_start = ( (uint32_t)Configuration.work_space_start +
132                                        rtems_configuration_get_work_space_size() );
133
134    bsp_libc_init((void *)heap_start, (uint32_t)(&_RAMEnd) - heap_start, 0);
135
136        #ifdef RTEMS_DEBUG
137                rtems_debug_enable( RTEMS_DEBUG_ALL_MASK );
138        #endif
139}
140
141/*-------------------- Haleakala-specific UART setup -------------------------*/
142
143static void
144EarlyUARTInit(int baudRate)
145{
146        uint8_t* up = (uint8_t*)(BSP_UART_IOBASE_COM1);
147        int divider = BSP_UART_BAUD_BASE / baudRate;
148        up[LCR] = DLAB;         /* Access DLM/DLL */
149        up[DLL] = divider & 0x0FF;
150        up[DLM] = divider >> 8;
151        up[LCR] = CHR_8_BITS;
152        up[MCR] = DTR | RTS;
153        up[FCR] = FIFO_EN | XMIT_RESET | RCV_RESET;
154        up[THR] = '+';
155}
156
157
158static void
159InitUARTClock()
160{
161        uint32_t reg;
162        mfsdr(SDR0_UART0,reg);
163        reg &= ~0x008000FF;
164        reg |= 0x00800001;              /* Ext clock, div 1 */
165        mtsdr(SDR0_UART0,reg);
166}
167
168void GPIO_AlternateSelect(int bitnum, int source)
169/* PPC405EX: select a GPIO function for the specified pin */
170{
171        int shift;
172        unsigned long value, mask;
173        GPIORegisters* gpioPtr = (GPIORegisters*)(GPIOAddress);
174
175        shift = (31 - bitnum) & 0xF;
176        value = (source & 3) << (shift*2);
177        mask  = 3 << (shift*2);
178        if (bitnum <= 15) {
179                gpioPtr->OSRL = (gpioPtr->OSRL & ~mask) | value;
180                gpioPtr->TSRL = (gpioPtr->TSRL & ~mask) | value;
181        } else {
182                gpioPtr->OSRH = (gpioPtr->OSRH & ~mask) | value;
183                gpioPtr->TSRH = (gpioPtr->TSRH & ~mask) | value;
184        }
185}
186
187void Init_FPGA()
188{
189        /* Have to write to the FPGA to enable the UART drivers */
190        /* Have to enable CS2 as an output in GPIO to get the FPGA working */
191        mtebc(EBC0_B2CR,0xF0018000);    /* Set up CS2 at 0xF0000000 */
192        mtebc(EBC0_B2AP,0x9400C800);
193        GPIO_AlternateSelect(9,1);              /* GPIO9 = PerCS2 */
194        {
195                unsigned long *fpgaPtr = (unsigned long*)(0xF0000000);
196                unsigned long n;
197                n = *(fpgaPtr);
198                n &= ~0x00100;          /* User LEDs on */
199                n |=  0x30000;          /* UART 0 and 1 transcievers on! */
200                *fpgaPtr = n;
201        }
202}
203
204/*===================================================================*/
205
206static void
207DirectUARTWrite(const char c)
208{
209        uint8_t* up = (uint8_t*)(BSP_UART_IOBASE_COM1);
210        while ((up[LSR] & THRE) == 0) { ; }
211        up[THR] = c;
212        if (c=='\n')
213                DirectUARTWrite('\r');
214}
215
216/* We will provide our own printk output function as it may get used early */
217BSP_output_char_function_type BSP_output_char = DirectUARTWrite;
218
219
220/*===================================================================*/
221
222
223/*
224 *  bsp_start
225 *
226 *  This routine does the bulk of the system initialization.
227 */
228
229
230void bsp_start( void )
231{
232        LINKER_SYMBOL(intrStack_start);
233        LINKER_SYMBOL(intrStack_size);
234        ppc_cpu_id_t myCpu;
235        ppc_cpu_revision_t myCpuRevision;
236
237        /* Get the UART clock initialized first in case we call printk */
238
239        InitUARTClock();
240        Init_FPGA();
241        EarlyUARTInit(115200);
242
243        /*
244        * Get CPU identification dynamically. Note that the get_ppc_cpu_type()
245        * function store the result in global variables
246        * so that it can be used later...
247        */
248        myCpu       = get_ppc_cpu_type();
249        myCpuRevision = get_ppc_cpu_revision();
250
251        /*
252        *  initialize the device driver parameters
253        */
254
255        /* Set globals visible to clock.c */
256        bsp_clicks_per_usec = 400;      /* timebase register ticks/microsecond = CPU Clk in MHz */
257        bsp_timer_internal_clock  = TRUE;
258        bsp_timer_average_overhead = 2;
259        bsp_timer_least_valid = 3;
260       
261        /*
262        * Initialize default raw exception handlers.
263        */
264        ppc_exc_initialize(
265                PPC_INTERRUPT_DISABLE_MASK_DEFAULT,
266                           (uint32_t) intrStack_start,
267                           (uint32_t) intrStack_size);
268
269        /*
270        * Install our own set of exception vectors
271        */
272        BSP_rtems_irq_mng_init(0);
273
274        /*
275        *  Allocate the memory for the RTEMS Work Space.  This can come from
276        *  a variety of places: hard coded address, malloc'ed from outside
277        *  RTEMS world (e.g. simulator or primitive memory manager), or (as
278        *  typically done by stock BSPs) by subtracting the required amount
279        *  of work space from the last physical address on the CPU board.
280        */
281        /* In this case we allocate space at an address defined in linkcmds
282           which points to a block above the stack and below the heap */
283        {
284                extern uint8_t  _WorkspaceStart;       
285                Configuration.work_space_start = &_WorkspaceStart;
286        }
287
288}
289
290void BSP_ask_for_reset(void)
291{
292  printk("system stopped, press RESET");
293  while(1) {};
294}
295
296void BSP_panic(char *s)
297{
298  printk("%s PANIC %s\n",_RTEMS_version, s);
299  BSP_ask_for_reset();
300}
301
302void _BSP_Fatal_error(unsigned int v)
303{
304  printk("%s PANIC ERROR %x\n",_RTEMS_version, v);
305  BSP_ask_for_reset();
306}
307
308
Note: See TracBrowser for help on using the repository browser.