gensh2/start/hw_init.c

0001 /*
0002  *  hw_init.c: set up sh7045F internal subunits
0003  *             Pin and memory assignments assume
0004  *             target is Hitachi SH7045F EVB ("lcevb")
0005  *
0006  *             Provides two initialization routines:
0007  *             A. 'void early_hw_init(void)' for 'start.S'
0008  *                sets up hw needed for early RTEMS boot, and
0009  *             B. 'void bsp_hw_init(void)' for 'bspstart.c'
0010  *                sets up hardware used by this BSP.
0011  *
0012  *  Author: John M. Mills (jmills@tga.com)
0013  *  COPYRIGHT(c) 2000, TGA Technologies, Inc
0014  *                     Norcross, GA 30071 U.S.A
0015  *
0016  *  This program is distributed in the hope that it will be useful,
0017  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
0018  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
0019  *
0020  *
0021  *  The license and distribution terms for this file may be
0022  *  found in the file LICENSE in this distribution or at
0023  *  http://www.rtems.org/license/LICENSE.
0024  *
0025  *  Adapted from Hitachi EVB7045F tutorial files by:
0026  *  John M. Mills (jmills@tga.com)
0027  *  TGA Technologies, Inc.
0028  *  100 Pinnacle Way, Suite 140
0029  *  Norcross, GA 30071 U.S.A.
0030  *
0031  *
0032  *  This file may be copied and distributed in accordance
0033  *  the above-referenced license. It is provided for critique and
0034  *  developmental purposes without any warranty nor representation
0035  *  by the authors or by TGA Technologies.
0036  */
0037
0038 #include <bsp.h>
0039
0040 #include <stdlib.h>
0041
0042 #include <rtems/libio.h>
0043 #include <rtems/score/sh_io.h>
0044 #include <rtems/score/iosh7045.h>
0045
0046 /* exported entries */
0047 extern void bsp_hw_init (void);
0048 extern void early_hw_init (void);
0049
0050 /*  called from 'start.S' on "#ifdef START_HW_INIT" */
0051 void early_hw_init (void)
0052 {
0053 #ifdef STANDALONE_EVB
0054   /* STANDALONE_EVB minimally sets up bus and DRAM here */
0055   /* no STANDALONE_EVB accepts defaults from debug monitor */
0056
0057   /* FIXME: replace 'magic numbers' with logical names */
0058
0059   write16(0x2020, BSC_BCR1);  /* Bus width access - 32-bit on CS1 */
0060   write16(0xF3DD, BSC_BCR2);  /* Idle cycles CS3-CS0 - 0 idle cycles*/
0061   write16(0xFF3F, BSC_WCR1);  /* Waits for CS3-CS0 - 3 waits on CS1 */
0062   write16(0x000F, BSC_WCR2);  /* Waits for DRAM/DMA access - default */
0063   write16(0x0000, BSC_DCR);   /* DRAM control - default */
0064   write16(0x0000, BSC_RTCSR); /* DRAM refresh - default */
0065   write16(0x0000, BSC_RTCNT); /* DRAM refresh counter - default*/
0066   write16(0x0000, BSC_RTCOR); /* DRAM refresh compare match - default */
0067 #endif
0068
0069   /*  add early-init functions here */
0070
0071 };
0072
0073 /*  to be called from 'bspstart.c' */
0074 void bsp_hw_init (void)
0075 {
0076   uint16_t   temp16;
0077
0078 #ifdef STANDALONE_EVB
0079   /* STANDALONE_EVB: sets up PFC */
0080   /* no STANDALONE_EVB: accepts defaults, adds RESET */
0081
0082   /* FIXME: replace 'magic numbers' */
0083
0084   write16(0x5000, PFC_PACRH);  /* Pin function controller - WRHH, WRHL */
0085   write16(0x1550, PFC_PACRL1); /* Pin fun. controller - WRH,WRL,RD,CS1 */
0086   write16(0x0000, PFC_PBCR1);  /* Pin function controller - default */
0087   write16(0x2005, PFC_PBCR2);  /* Pin fcn. controller - A18,A17,A16 */
0088   write16(0xFFFF, PFC_PCCR);   /* Pin function controller - A15-A0  */
0089   write16(0x5555, PFC_PDCRH1); /* Pin function controller - D31-D24 */
0090   write16(0x5555, PFC_PDCRH2); /* Pin function controller - D23-D16 */
0091   write16(0xFFFF, PFC_PDCRL);  /* Pin function controller - D15-D0  */
0092   write16(0x0000, PFC_IFCR);   /* Pin function controller - default */
0093   write16(0x0000, PFC_PACRL2); /* default disconnects all I/O pins;*/
0094                            /*  [re-connected by DEVICE_open()] */
0095 #endif
0096
0097   /* default hardware setup for SH7045F EVB */
0098
0099   /* PFC: General I/O except pin 13 (reset): */
0100   temp16 = read16(PFC_PECR1);
0101   temp16 |= 0x0800;
0102   write16(temp16, PFC_PECR1);
0103
0104   /* All I/O lines bits 7-0: */
0105   write16(0x00, PFC_PECR2);
0106
0107   /* P5 (LED) out, all other pins in: */
0108   temp16 = read16(PFC_PEIOR);
0109   temp16 |= 0x0020;
0110   write16(temp16, PFC_PEIOR);
0111
0112 }