/* * (C) Copyright 2004 * DAVE Srl * http://www.dave-tech.it * http://www.wawnet.biz * mailto:info@wawnet.biz * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ /* * S3C44B0 CPU specific code */ #include <common.h> #include <command.h> #include <asm/hardware.h> static void s3c44b0_flush_cache(void) { volatile int i; /* flush cycle */ for(i=0x10002000;i<0x10004800;i+=16) { *((int *)i)=0x0; } } int cpu_init (void) { icache_enable(); return 0; } int cleanup_before_linux (void) { /* cache memory should be enabled before calling Linux to make the kernel uncompression faster */ icache_enable(); disable_interrupts (); return 0; } void reset_cpu (ulong addr) { /* reset the cpu using watchdog */ /* Disable the watchdog.*/ WTCON&=~(1<<5); /* set the timeout value to a short time... */ WTCNT = 0x1; /* Enable the watchdog. */ WTCON|=1; WTCON|=(1<<5); while(1) { /*NOP*/ } } int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) { disable_interrupts (); reset_cpu (0); /*NOTREACHED*/ return (0); } void icache_enable (void) { ulong reg; s3c44b0_flush_cache(); /* Init cache Non-cacheable area (everything outside RAM) 0x0000:0000 - 0x0C00:0000 */ NCACHBE0 = 0xC0000000; NCACHBE1 = 0x00000000; /* Enable chache */ reg = SYSCFG; reg |= 0x00000006; /* 8kB */ SYSCFG = reg; } void icache_disable (void) { ulong reg; reg = SYSCFG; reg &= ~0x00000006; /* 8kB */ SYSCFG = reg; } int icache_status (void) { return 0; } void dcache_enable (void) { icache_enable(); } void dcache_disable (void) { icache_disable(); } int dcache_status (void) { return dcache_status(); } /* RTC stuff */ #include <rtc.h> #ifndef BCD2HEX #define BCD2HEX(n) ((n>>4)*10+(n&0x0f)) #endif #ifndef HEX2BCD #define HEX2BCD(x) ((((x) / 10) << 4) + (x) % 10) #endif void rtc_get (struct rtc_time* tm) { RTCCON |= 1; tm->tm_year = BCD2HEX(BCDYEAR); tm->tm_mon = BCD2HEX(BCDMON); tm->tm_wday = BCD2HEX(BCDDATE); tm->tm_mday = BCD2HEX(BCDDAY); tm->tm_hour = BCD2HEX(BCDHOUR); tm->tm_min = BCD2HEX(BCDMIN); tm->tm_sec = BCD2HEX(BCDSEC); if (tm->tm_sec==0) { /* we have to re-read the rtc data because of the "one second deviation" problem */ /* see RTC datasheet for more info about it */ tm->tm_year = BCD2HEX(BCDYEAR); tm->tm_mon = BCD2HEX(BCDMON); tm->tm_mday = BCD2HEX(BCDDAY); tm->tm_wday = BCD2HEX(BCDDATE); tm->tm_hour = BCD2HEX(BCDHOUR); tm->tm_min = BCD2HEX(BCDMIN); tm->tm_sec = BCD2HEX(BCDSEC); } RTCCON &= ~1; if(tm->tm_year >= 70) tm->tm_year += 1900; else tm->tm_year += 2000; } void rtc_set (struct rtc_time* tm) { if(tm->tm_year < 2000) tm->tm_year -= 1900; else tm->tm_year -= 2000; RTCCON |= 1; BCDYEAR = HEX2BCD(tm->tm_year); BCDMON = HEX2BCD(tm->tm_mon); BCDDAY = HEX2BCD(tm->tm_mday); BCDDATE = HEX2BCD(tm->tm_wday); BCDHOUR = HEX2BCD(tm->tm_hour); BCDMIN = HEX2BCD(tm->tm_min); BCDSEC = HEX2BCD(tm->tm_sec); RTCCON &= 1; } void rtc_reset (void) { RTCCON |= 1; BCDYEAR = 0; BCDMON = 0; BCDDAY = 0; BCDDATE = 0; BCDHOUR = 0; BCDMIN = 0; BCDSEC = 0; RTCCON &= 1; } /* I2C stuff */ /* * Initialization, must be called once on start up, may be called * repeatedly to change the speed and slave addresses. */ void i2c_init(int speed, int slaveaddr) { /* setting up I2C support */ unsigned int save_F,save_PF,rIICCON,rPCONA,rPDATA,rPCONF,rPUPF; save_F = PCONF; save_PF = PUPF; rPCONF = ((save_F & ~(0xF))| 0xa); rPUPF = (save_PF | 0x3); PCONF = rPCONF; /*PF0:IICSCL, PF1:IICSDA*/ PUPF = rPUPF; /* Disable pull-up */ /* Configuring pin for WC pin of EEprom */ rPCONA = PCONA; rPCONA &= ~(1<<9); PCONA = rPCONA; rPDATA = PDATA; rPDATA &= ~(1<<9); PDATA = rPDATA; /* Enable ACK, IICCLK=MCLK/16, enable interrupt 75Mhz/16/(12+1) = 390625 Hz */ rIICCON=(1<<7)|(0<<6)|(1<<5)|(0xC); IICCON = rIICCON; IICADD = slaveaddr; } /* * Probe the given I2C chip address. Returns 0 if a chip responded, * not 0 on failure. */ int i2c_probe(uchar chip) { /* not implemented */ printf("i2c_probe chip %d\n", (int) chip); return -1; } /* * Read/Write interface: * chip: I2C chip address, range 0..127 * addr: Memory (register) address within the chip * alen: Number of bytes to use for addr (typically 1, 2 for larger * memories, 0 for register type devices with only one * register) * buffer: Where to read/write the data * len: How many bytes to read/write * * Returns: 0 on success, not 0 on failure */ #define S3C44B0X_rIIC_INTPEND (1<<4) #define S3C44B0X_rIIC_LAST_RECEIV_BIT (1<<0) #define S3C44B0X_rIIC_INTERRUPT_ENABLE (1<<5) #define S3C44B0_IIC_TIMEOUT 100 int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) { int k, j, temp; u32 rIICSTAT; /* send the device offset */ rIICSTAT = 0xD0; IICSTAT = rIICSTAT; IICDS = chip; /* this is a write operation... */ rIICSTAT |= (1<<5); IICSTAT = rIICSTAT; for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) { temp = IICCON; if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND) break; udelay(2000); } if (k==S3C44B0_IIC_TIMEOUT) return -1; /* wait and check ACK */ temp = IICSTAT; if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT ) return -1; IICDS = addr; IICCON = IICCON & ~(S3C44B0X_rIIC_INTPEND); /* wait and check ACK */ for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) { temp = IICCON; if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND) break; udelay(2000); } if (k==S3C44B0_IIC_TIMEOUT) return -1; temp = IICSTAT; if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT ) return -1; /* now we can start with the read operation... */ IICDS = chip | 0x01; /* this is a read operation... */ rIICSTAT = 0x90; /*master recv*/ rIICSTAT |= (1<<5); IICSTAT = rIICSTAT; IICCON = IICCON & ~(S3C44B0X_rIIC_INTPEND); /* wait and check ACK */ for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) { temp = IICCON; if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND) break; udelay(2000); } if (k==S3C44B0_IIC_TIMEOUT) return -1; temp = IICSTAT; if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT ) return -1; for (j=0; j<len-1; j++) { /*clear pending bit to resume */ temp = IICCON & ~(S3C44B0X_rIIC_INTPEND); IICCON = temp; /* wait and check ACK */ for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) { temp = IICCON; if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND) break; udelay(2000); } if (k==S3C44B0_IIC_TIMEOUT) return -1; buffer[j] = IICDS; /*save readed data*/ } /*end for(j)*/ /* reading the last data unset ACK generation */ temp = IICCON & ~(S3C44B0X_rIIC_INTPEND | (1<<7)); IICCON = temp; /* wait but NOT check ACK */ for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) { temp = IICCON; if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND) break; udelay(2000); } if (k==S3C44B0_IIC_TIMEOUT) return -1; buffer[j] = IICDS; /*save readed data*/ rIICSTAT = 0x90; /*master recv*/ /* Write operation Terminate sending STOP */ IICSTAT = rIICSTAT; /*Clear Int Pending Bit to RESUME*/ temp = IICCON; IICCON = temp & (~S3C44B0X_rIIC_INTPEND); IICCON = IICCON | (1<<7); /*restore ACK generation*/ return 0; } int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) { int j, k; u32 rIICSTAT, temp; /* send the device offset */ rIICSTAT = 0xD0; IICSTAT = rIICSTAT; IICDS = chip; /* this is a write operation... */ rIICSTAT |= (1<<5); IICSTAT = rIICSTAT; IICCON = IICCON & ~(S3C44B0X_rIIC_INTPEND); /* wait and check ACK */ for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) { temp = IICCON; if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND) break; udelay(2000); } if (k==S3C44B0_IIC_TIMEOUT) return -1; temp = IICSTAT; if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT ) return -1; IICDS = addr; IICCON = IICCON & ~(S3C44B0X_rIIC_INTPEND); /* wait and check ACK */ for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) { temp = IICCON; if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND) break; udelay(2000); } if (k==S3C44B0_IIC_TIMEOUT) return -1; temp = IICSTAT; if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT ) return -1; /* now we can start with the read write operation */ for (j=0; j<len; j++) { IICDS = buffer[j]; /*prerare data to write*/ /*clear pending bit to resume*/ temp = IICCON & ~(S3C44B0X_rIIC_INTPEND); IICCON = temp; /* wait but NOT check ACK */ for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) { temp = IICCON; if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND) break; udelay(2000); } if (k==S3C44B0_IIC_TIMEOUT) return -1; } /* end for(j) */ /* sending stop to terminate */ rIICSTAT = 0xD0; /*master send*/ IICSTAT = rIICSTAT; /*Clear Int Pending Bit to RESUME*/ temp = IICCON; IICCON = temp & (~S3C44B0X_rIIC_INTPEND); return 0; }