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-rw-r--r--cpu/s3c44b0/cpu.c511
1 files changed, 511 insertions, 0 deletions
diff --git a/cpu/s3c44b0/cpu.c b/cpu/s3c44b0/cpu.c
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index 000000000..1a8a17dc5
--- /dev/null
+++ b/cpu/s3c44b0/cpu.c
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+/*
+ * (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[])
+{
+ extern void reset_cpu (ulong addr);
+
+ 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(__FUNCTION__ " 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;
+}
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