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-rw-r--r--drivers/i2c/Makefile3
-rw-r--r--drivers/i2c/davinci_i2c.c329
-rw-r--r--drivers/i2c/s3c24x0_i2c.c442
-rw-r--r--drivers/i2c/s3c44b0_i2c.c315
4 files changed, 1089 insertions, 0 deletions
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 9c74657..ef32f13 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -26,11 +26,14 @@ include $(TOPDIR)/config.mk
LIB := $(obj)libi2c.a
COBJS-$(CONFIG_BFIN_TWI_I2C) += bfin-twi_i2c.o
+COBJS-$(CONFIG_DRIVER_DAVINCI_I2C) += davinci_i2c.o
COBJS-$(CONFIG_FSL_I2C) += fsl_i2c.o
COBJS-$(CONFIG_I2C_MXC) += mxc_i2c.o
COBJS-$(CONFIG_DRIVER_OMAP1510_I2C) += omap1510_i2c.o
COBJS-$(CONFIG_DRIVER_OMAP24XX_I2C) += omap24xx_i2c.o
COBJS-$(CONFIG_DRIVER_OMAP34XX_I2C) += omap24xx_i2c.o
+COBJS-$(CONFIG_DRIVER_S3C24X0_I2C) += s3c24x0_i2c.o
+COBJS-$(CONFIG_S3C44B0_I2C) += s3c44b0_i2c.o
COBJS-$(CONFIG_SOFT_I2C) += soft_i2c.o
COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
diff --git a/drivers/i2c/davinci_i2c.c b/drivers/i2c/davinci_i2c.c
new file mode 100644
index 0000000..eee1cbd
--- /dev/null
+++ b/drivers/i2c/davinci_i2c.c
@@ -0,0 +1,329 @@
+/*
+ * TI DaVinci (TMS320DM644x) I2C driver.
+ *
+ * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
+ *
+ * --------------------------------------------------------
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/i2c_defs.h>
+
+#define CHECK_NACK() \
+ do {\
+ if (tmp & (I2C_TIMEOUT | I2C_STAT_NACK)) {\
+ REG(I2C_CON) = 0;\
+ return(1);\
+ }\
+ } while (0)
+
+
+static int wait_for_bus(void)
+{
+ int stat, timeout;
+
+ REG(I2C_STAT) = 0xffff;
+
+ for (timeout = 0; timeout < 10; timeout++) {
+ if (!((stat = REG(I2C_STAT)) & I2C_STAT_BB)) {
+ REG(I2C_STAT) = 0xffff;
+ return(0);
+ }
+
+ REG(I2C_STAT) = stat;
+ udelay(50000);
+ }
+
+ REG(I2C_STAT) = 0xffff;
+ return(1);
+}
+
+
+static int poll_i2c_irq(int mask)
+{
+ int stat, timeout;
+
+ for (timeout = 0; timeout < 10; timeout++) {
+ udelay(1000);
+ stat = REG(I2C_STAT);
+ if (stat & mask) {
+ return(stat);
+ }
+ }
+
+ REG(I2C_STAT) = 0xffff;
+ return(stat | I2C_TIMEOUT);
+}
+
+
+void flush_rx(void)
+{
+ int dummy;
+
+ while (1) {
+ if (!(REG(I2C_STAT) & I2C_STAT_RRDY))
+ break;
+
+ dummy = REG(I2C_DRR);
+ REG(I2C_STAT) = I2C_STAT_RRDY;
+ udelay(1000);
+ }
+}
+
+
+void i2c_init(int speed, int slaveadd)
+{
+ u_int32_t div, psc;
+
+ if (REG(I2C_CON) & I2C_CON_EN) {
+ REG(I2C_CON) = 0;
+ udelay (50000);
+ }
+
+ psc = 2;
+ div = (CONFIG_SYS_HZ_CLOCK / ((psc + 1) * speed)) - 10; /* SCLL + SCLH */
+ REG(I2C_PSC) = psc; /* 27MHz / (2 + 1) = 9MHz */
+ REG(I2C_SCLL) = (div * 50) / 100; /* 50% Duty */
+ REG(I2C_SCLH) = div - REG(I2C_SCLL);
+
+ REG(I2C_OA) = slaveadd;
+ REG(I2C_CNT) = 0;
+
+ /* Interrupts must be enabled or I2C module won't work */
+ REG(I2C_IE) = I2C_IE_SCD_IE | I2C_IE_XRDY_IE |
+ I2C_IE_RRDY_IE | I2C_IE_ARDY_IE | I2C_IE_NACK_IE;
+
+ /* Now enable I2C controller (get it out of reset) */
+ REG(I2C_CON) = I2C_CON_EN;
+
+ udelay(1000);
+}
+
+
+int i2c_probe(u_int8_t chip)
+{
+ int rc = 1;
+
+ if (chip == REG(I2C_OA)) {
+ return(rc);
+ }
+
+ REG(I2C_CON) = 0;
+ if (wait_for_bus()) {return(1);}
+
+ /* try to read one byte from current (or only) address */
+ REG(I2C_CNT) = 1;
+ REG(I2C_SA) = chip;
+ REG(I2C_CON) = (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP);
+ udelay (50000);
+
+ if (!(REG(I2C_STAT) & I2C_STAT_NACK)) {
+ rc = 0;
+ flush_rx();
+ REG(I2C_STAT) = 0xffff;
+ } else {
+ REG(I2C_STAT) = 0xffff;
+ REG(I2C_CON) |= I2C_CON_STP;
+ udelay(20000);
+ if (wait_for_bus()) {return(1);}
+ }
+
+ flush_rx();
+ REG(I2C_STAT) = 0xffff;
+ REG(I2C_CNT) = 0;
+ return(rc);
+}
+
+
+int i2c_read(u_int8_t chip, u_int32_t addr, int alen, u_int8_t *buf, int len)
+{
+ u_int32_t tmp;
+ int i;
+
+ if ((alen < 0) || (alen > 2)) {
+ printf("%s(): bogus address length %x\n", __FUNCTION__, alen);
+ return(1);
+ }
+
+ if (wait_for_bus()) {return(1);}
+
+ if (alen != 0) {
+ /* Start address phase */
+ tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX;
+ REG(I2C_CNT) = alen;
+ REG(I2C_SA) = chip;
+ REG(I2C_CON) = tmp;
+
+ tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK);
+
+ CHECK_NACK();
+
+ switch (alen) {
+ case 2:
+ /* Send address MSByte */
+ if (tmp & I2C_STAT_XRDY) {
+ REG(I2C_DXR) = (addr >> 8) & 0xff;
+ } else {
+ REG(I2C_CON) = 0;
+ return(1);
+ }
+
+ tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK);
+
+ CHECK_NACK();
+ /* No break, fall through */
+ case 1:
+ /* Send address LSByte */
+ if (tmp & I2C_STAT_XRDY) {
+ REG(I2C_DXR) = addr & 0xff;
+ } else {
+ REG(I2C_CON) = 0;
+ return(1);
+ }
+
+ tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK | I2C_STAT_ARDY);
+
+ CHECK_NACK();
+
+ if (!(tmp & I2C_STAT_ARDY)) {
+ REG(I2C_CON) = 0;
+ return(1);
+ }
+ }
+ }
+
+ /* Address phase is over, now read 'len' bytes and stop */
+ tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP;
+ REG(I2C_CNT) = len & 0xffff;
+ REG(I2C_SA) = chip;
+ REG(I2C_CON) = tmp;
+
+ for (i = 0; i < len; i++) {
+ tmp = poll_i2c_irq(I2C_STAT_RRDY | I2C_STAT_NACK | I2C_STAT_ROVR);
+
+ CHECK_NACK();
+
+ if (tmp & I2C_STAT_RRDY) {
+ buf[i] = REG(I2C_DRR);
+ } else {
+ REG(I2C_CON) = 0;
+ return(1);
+ }
+ }
+
+ tmp = poll_i2c_irq(I2C_STAT_SCD | I2C_STAT_NACK);
+
+ CHECK_NACK();
+
+ if (!(tmp & I2C_STAT_SCD)) {
+ REG(I2C_CON) = 0;
+ return(1);
+ }
+
+ flush_rx();
+ REG(I2C_STAT) = 0xffff;
+ REG(I2C_CNT) = 0;
+ REG(I2C_CON) = 0;
+
+ return(0);
+}
+
+
+int i2c_write(u_int8_t chip, u_int32_t addr, int alen, u_int8_t *buf, int len)
+{
+ u_int32_t tmp;
+ int i;
+
+ if ((alen < 0) || (alen > 2)) {
+ printf("%s(): bogus address length %x\n", __FUNCTION__, alen);
+ return(1);
+ }
+ if (len < 0) {
+ printf("%s(): bogus length %x\n", __FUNCTION__, len);
+ return(1);
+ }
+
+ if (wait_for_bus()) {return(1);}
+
+ /* Start address phase */
+ tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX | I2C_CON_STP;
+ REG(I2C_CNT) = (alen == 0) ? len & 0xffff : (len & 0xffff) + alen;
+ REG(I2C_SA) = chip;
+ REG(I2C_CON) = tmp;
+
+ switch (alen) {
+ case 2:
+ /* Send address MSByte */
+ tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK);
+
+ CHECK_NACK();
+
+ if (tmp & I2C_STAT_XRDY) {
+ REG(I2C_DXR) = (addr >> 8) & 0xff;
+ } else {
+ REG(I2C_CON) = 0;
+ return(1);
+ }
+ /* No break, fall through */
+ case 1:
+ /* Send address LSByte */
+ tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK);
+
+ CHECK_NACK();
+
+ if (tmp & I2C_STAT_XRDY) {
+ REG(I2C_DXR) = addr & 0xff;
+ } else {
+ REG(I2C_CON) = 0;
+ return(1);
+ }
+ }
+
+ for (i = 0; i < len; i++) {
+ tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK);
+
+ CHECK_NACK();
+
+ if (tmp & I2C_STAT_XRDY) {
+ REG(I2C_DXR) = buf[i];
+ } else {
+ return(1);
+ }
+ }
+
+ tmp = poll_i2c_irq(I2C_STAT_SCD | I2C_STAT_NACK);
+
+ CHECK_NACK();
+
+ if (!(tmp & I2C_STAT_SCD)) {
+ REG(I2C_CON) = 0;
+ return(1);
+ }
+
+ flush_rx();
+ REG(I2C_STAT) = 0xffff;
+ REG(I2C_CNT) = 0;
+ REG(I2C_CON) = 0;
+
+ return(0);
+}
diff --git a/drivers/i2c/s3c24x0_i2c.c b/drivers/i2c/s3c24x0_i2c.c
new file mode 100644
index 0000000..f0c1aa3
--- /dev/null
+++ b/drivers/i2c/s3c24x0_i2c.c
@@ -0,0 +1,442 @@
+/*
+ * (C) Copyright 2002
+ * David Mueller, ELSOFT AG, d.mueller@elsoft.ch
+ *
+ * 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
+ */
+
+/* This code should work for both the S3C2400 and the S3C2410
+ * as they seem to have the same I2C controller inside.
+ * The different address mapping is handled by the s3c24xx.h files below.
+ */
+
+#include <common.h>
+#if defined(CONFIG_S3C2400)
+#include <s3c2400.h>
+#elif defined(CONFIG_S3C2410)
+#include <s3c2410.h>
+#endif
+#include <i2c.h>
+
+#ifdef CONFIG_HARD_I2C
+
+#define I2C_WRITE 0
+#define I2C_READ 1
+
+#define I2C_OK 0
+#define I2C_NOK 1
+#define I2C_NACK 2
+#define I2C_NOK_LA 3 /* Lost arbitration */
+#define I2C_NOK_TOUT 4 /* time out */
+
+#define I2CSTAT_BSY 0x20 /* Busy bit */
+#define I2CSTAT_NACK 0x01 /* Nack bit */
+#define I2CCON_IRPND 0x10 /* Interrupt pending bit */
+#define I2C_MODE_MT 0xC0 /* Master Transmit Mode */
+#define I2C_MODE_MR 0x80 /* Master Receive Mode */
+#define I2C_START_STOP 0x20 /* START / STOP */
+#define I2C_TXRX_ENA 0x10 /* I2C Tx/Rx enable */
+
+#define I2C_TIMEOUT 1 /* 1 second */
+
+
+static int GetI2CSDA(void)
+{
+ S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
+
+#ifdef CONFIG_S3C2410
+ return (gpio->GPEDAT & 0x8000) >> 15;
+#endif
+#ifdef CONFIG_S3C2400
+ return (gpio->PGDAT & 0x0020) >> 5;
+#endif
+}
+
+#if 0
+static void SetI2CSDA(int x)
+{
+ rGPEDAT = (rGPEDAT & ~0x8000) | (x&1) << 15;
+}
+#endif
+
+static void SetI2CSCL(int x)
+{
+ S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
+
+#ifdef CONFIG_S3C2410
+ gpio->GPEDAT = (gpio->GPEDAT & ~0x4000) | (x&1) << 14;
+#endif
+#ifdef CONFIG_S3C2400
+ gpio->PGDAT = (gpio->PGDAT & ~0x0040) | (x&1) << 6;
+#endif
+}
+
+
+static int WaitForXfer (void)
+{
+ S3C24X0_I2C *const i2c = S3C24X0_GetBase_I2C ();
+ int i, status;
+
+ i = I2C_TIMEOUT * 10000;
+ status = i2c->IICCON;
+ while ((i > 0) && !(status & I2CCON_IRPND)) {
+ udelay (100);
+ status = i2c->IICCON;
+ i--;
+ }
+
+ return (status & I2CCON_IRPND) ? I2C_OK : I2C_NOK_TOUT;
+}
+
+static int IsACK (void)
+{
+ S3C24X0_I2C *const i2c = S3C24X0_GetBase_I2C ();
+
+ return (!(i2c->IICSTAT & I2CSTAT_NACK));
+}
+
+static void ReadWriteByte (void)
+{
+ S3C24X0_I2C *const i2c = S3C24X0_GetBase_I2C ();
+
+ i2c->IICCON &= ~I2CCON_IRPND;
+}
+
+void i2c_init (int speed, int slaveadd)
+{
+ S3C24X0_I2C *const i2c = S3C24X0_GetBase_I2C ();
+ S3C24X0_GPIO *const gpio = S3C24X0_GetBase_GPIO ();
+ ulong freq, pres = 16, div;
+ int i, status;
+
+ /* wait for some time to give previous transfer a chance to finish */
+
+ i = I2C_TIMEOUT * 1000;
+ status = i2c->IICSTAT;
+ while ((i > 0) && (status & I2CSTAT_BSY)) {
+ udelay (1000);
+ status = i2c->IICSTAT;
+ i--;
+ }
+
+ if ((status & I2CSTAT_BSY) || GetI2CSDA () == 0) {
+#ifdef CONFIG_S3C2410
+ ulong old_gpecon = gpio->GPECON;
+#endif
+#ifdef CONFIG_S3C2400
+ ulong old_gpecon = gpio->PGCON;
+#endif
+ /* bus still busy probably by (most) previously interrupted transfer */
+
+#ifdef CONFIG_S3C2410
+ /* set I2CSDA and I2CSCL (GPE15, GPE14) to GPIO */
+ gpio->GPECON = (gpio->GPECON & ~0xF0000000) | 0x10000000;
+#endif
+#ifdef CONFIG_S3C2400
+ /* set I2CSDA and I2CSCL (PG5, PG6) to GPIO */
+ gpio->PGCON = (gpio->PGCON & ~0x00003c00) | 0x00001000;
+#endif
+
+ /* toggle I2CSCL until bus idle */
+ SetI2CSCL (0);
+ udelay (1000);
+ i = 10;
+ while ((i > 0) && (GetI2CSDA () != 1)) {
+ SetI2CSCL (1);
+ udelay (1000);
+ SetI2CSCL (0);
+ udelay (1000);
+ i--;
+ }
+ SetI2CSCL (1);
+ udelay (1000);
+
+ /* restore pin functions */
+#ifdef CONFIG_S3C2410
+ gpio->GPECON = old_gpecon;
+#endif
+#ifdef CONFIG_S3C2400
+ gpio->PGCON = old_gpecon;
+#endif
+ }
+
+ /* calculate prescaler and divisor values */
+ freq = get_PCLK ();
+ if ((freq / pres / (16 + 1)) > speed)
+ /* set prescaler to 512 */
+ pres = 512;
+
+ div = 0;
+ while ((freq / pres / (div + 1)) > speed)
+ div++;
+
+ /* set prescaler, divisor according to freq, also set
+ * ACKGEN, IRQ */
+ i2c->IICCON = (div & 0x0F) | 0xA0 | ((pres == 512) ? 0x40 : 0);
+
+ /* init to SLAVE REVEIVE and set slaveaddr */
+ i2c->IICSTAT = 0;
+ i2c->IICADD = slaveadd;
+ /* program Master Transmit (and implicit STOP) */
+ i2c->IICSTAT = I2C_MODE_MT | I2C_TXRX_ENA;
+
+}
+
+/*
+ * cmd_type is 0 for write, 1 for read.
+ *
+ * addr_len can take any value from 0-255, it is only limited
+ * by the char, we could make it larger if needed. If it is
+ * 0 we skip the address write cycle.
+ */
+static
+int i2c_transfer (unsigned char cmd_type,
+ unsigned char chip,
+ unsigned char addr[],
+ unsigned char addr_len,
+ unsigned char data[], unsigned short data_len)
+{
+ S3C24X0_I2C *const i2c = S3C24X0_GetBase_I2C ();
+ int i, status, result;
+
+ if (data == 0 || data_len == 0) {
+ /*Don't support data transfer of no length or to address 0 */
+ printf ("i2c_transfer: bad call\n");
+ return I2C_NOK;
+ }
+
+ /* Check I2C bus idle */
+ i = I2C_TIMEOUT * 1000;
+ status = i2c->IICSTAT;
+ while ((i > 0) && (status & I2CSTAT_BSY)) {
+ udelay (1000);
+ status = i2c->IICSTAT;
+ i--;
+ }
+
+ if (status & I2CSTAT_BSY)
+ return I2C_NOK_TOUT;
+
+ i2c->IICCON |= 0x80;
+ result = I2C_OK;
+
+ switch (cmd_type) {
+ case I2C_WRITE:
+ if (addr && addr_len) {
+ i2c->IICDS = chip;
+ /* send START */
+ i2c->IICSTAT = I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP;
+ i = 0;
+ while ((i < addr_len) && (result == I2C_OK)) {
+ result = WaitForXfer ();
+ i2c->IICDS = addr[i];
+ ReadWriteByte ();
+ i++;
+ }
+ i = 0;
+ while ((i < data_len) && (result == I2C_OK)) {
+ result = WaitForXfer ();
+ i2c->IICDS = data[i];
+ ReadWriteByte ();
+ i++;
+ }
+ } else {
+ i2c->IICDS = chip;
+ /* send START */
+ i2c->IICSTAT = I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP;
+ i = 0;
+ while ((i < data_len) && (result = I2C_OK)) {
+ result = WaitForXfer ();
+ i2c->IICDS = data[i];
+ ReadWriteByte ();
+ i++;
+ }
+ }
+
+ if (result == I2C_OK)
+ result = WaitForXfer ();
+
+ /* send STOP */
+ i2c->IICSTAT = I2C_MODE_MR | I2C_TXRX_ENA;
+ ReadWriteByte ();
+ break;
+
+ case I2C_READ:
+ if (addr && addr_len) {
+ i2c->IICSTAT = I2C_MODE_MT | I2C_TXRX_ENA;
+ i2c->IICDS = chip;
+ /* send START */
+ i2c->IICSTAT |= I2C_START_STOP;
+ result = WaitForXfer ();
+ if (IsACK ()) {
+ i = 0;
+ while ((i < addr_len) && (result == I2C_OK)) {
+ i2c->IICDS = addr[i];
+ ReadWriteByte ();
+ result = WaitForXfer ();
+ i++;
+ }
+
+ i2c->IICDS = chip;
+ /* resend START */
+ i2c->IICSTAT = I2C_MODE_MR | I2C_TXRX_ENA |
+ I2C_START_STOP;
+ ReadWriteByte ();
+ result = WaitForXfer ();
+ i = 0;
+ while ((i < data_len) && (result == I2C_OK)) {
+ /* disable ACK for final READ */
+ if (i == data_len - 1)
+ i2c->IICCON &= ~0x80;
+ ReadWriteByte ();
+ result = WaitForXfer ();
+ data[i] = i2c->IICDS;
+ i++;
+ }
+ } else {
+ result = I2C_NACK;
+ }
+
+ } else {
+ i2c->IICSTAT = I2C_MODE_MR | I2C_TXRX_ENA;
+ i2c->IICDS = chip;
+ /* send START */
+ i2c->IICSTAT |= I2C_START_STOP;
+ result = WaitForXfer ();
+
+ if (IsACK ()) {
+ i = 0;
+ while ((i < data_len) && (result == I2C_OK)) {
+ /* disable ACK for final READ */
+ if (i == data_len - 1)
+ i2c->IICCON &= ~0x80;
+ ReadWriteByte ();
+ result = WaitForXfer ();
+ data[i] = i2c->IICDS;
+ i++;
+ }
+ } else {
+ result = I2C_NACK;
+ }
+ }
+
+ /* send STOP */
+ i2c->IICSTAT = I2C_MODE_MR | I2C_TXRX_ENA;
+ ReadWriteByte ();
+ break;
+
+ default:
+ printf ("i2c_transfer: bad call\n");
+ result = I2C_NOK;
+ break;
+ }
+
+ return (result);
+}
+
+int i2c_probe (uchar chip)
+{
+ uchar buf[1];
+
+ buf[0] = 0;
+
+ /*
+ * What is needed is to send the chip address and verify that the
+ * address was <ACK>ed (i.e. there was a chip at that address which
+ * drove the data line low).
+ */
+ return (i2c_transfer (I2C_READ, chip << 1, 0, 0, buf, 1) != I2C_OK);
+}
+
+int i2c_read (uchar chip, uint addr, int alen, uchar * buffer, int len)
+{
+ uchar xaddr[4];
+ int ret;
+
+ if (alen > 4) {
+ printf ("I2C read: addr len %d not supported\n", alen);
+ return 1;
+ }
+
+ if (alen > 0) {
+ xaddr[0] = (addr >> 24) & 0xFF;
+ xaddr[1] = (addr >> 16) & 0xFF;
+ xaddr[2] = (addr >> 8) & 0xFF;
+ xaddr[3] = addr & 0xFF;
+ }
+
+#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
+ /*
+ * EEPROM chips that implement "address overflow" are ones
+ * like Catalyst 24WC04/08/16 which has 9/10/11 bits of
+ * address and the extra bits end up in the "chip address"
+ * bit slots. This makes a 24WC08 (1Kbyte) chip look like
+ * four 256 byte chips.
+ *
+ * Note that we consider the length of the address field to
+ * still be one byte because the extra address bits are
+ * hidden in the chip address.
+ */
+ if (alen > 0)
+ chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
+#endif
+ if ((ret =
+ i2c_transfer (I2C_READ, chip << 1, &xaddr[4 - alen], alen,
+ buffer, len)) != 0) {
+ printf ("I2c read: failed %d\n", ret);
+ return 1;
+ }
+ return 0;
+}
+
+int i2c_write (uchar chip, uint addr, int alen, uchar * buffer, int len)
+{
+ uchar xaddr[4];
+
+ if (alen > 4) {
+ printf ("I2C write: addr len %d not supported\n", alen);
+ return 1;
+ }
+
+ if (alen > 0) {
+ xaddr[0] = (addr >> 24) & 0xFF;
+ xaddr[1] = (addr >> 16) & 0xFF;
+ xaddr[2] = (addr >> 8) & 0xFF;
+ xaddr[3] = addr & 0xFF;
+ }
+#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
+ /*
+ * EEPROM chips that implement "address overflow" are ones
+ * like Catalyst 24WC04/08/16 which has 9/10/11 bits of
+ * address and the extra bits end up in the "chip address"
+ * bit slots. This makes a 24WC08 (1Kbyte) chip look like
+ * four 256 byte chips.
+ *
+ * Note that we consider the length of the address field to
+ * still be one byte because the extra address bits are
+ * hidden in the chip address.
+ */
+ if (alen > 0)
+ chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
+#endif
+ return (i2c_transfer
+ (I2C_WRITE, chip << 1, &xaddr[4 - alen], alen, buffer,
+ len) != 0);
+}
+#endif /* CONFIG_HARD_I2C */
diff --git a/drivers/i2c/s3c44b0_i2c.c b/drivers/i2c/s3c44b0_i2c.c
new file mode 100644
index 0000000..b4d904b
--- /dev/null
+++ b/drivers/i2c/s3c44b0_i2c.c
@@ -0,0 +1,315 @@
+/*
+ * (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
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/hardware.h>
+
+/*
+ * 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;
+}
generated by cgit v1.1 at 2024-12-01 10:34:49 +0000