From: Jean-Christophe PLAGNIOL-VILLARD Date: Mon, 30 Mar 2009 16:58:40 +0000 (+0200) Subject: s3c24x0: move i2c driver to drivers/i2c X-Git-Tag: v2009.06-rc1~112^2~5 X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=d3b635774194404bcd424f6b376419bce22076ad;p=u-boot s3c24x0: move i2c driver to drivers/i2c Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- diff --git a/cpu/arm920t/s3c24x0/Makefile b/cpu/arm920t/s3c24x0/Makefile index 8fd525e12e..fd13e53eb4 100644 --- a/cpu/arm920t/s3c24x0/Makefile +++ b/cpu/arm920t/s3c24x0/Makefile @@ -25,7 +25,7 @@ include $(TOPDIR)/config.mk LIB = $(obj)lib$(SOC).a -COBJS = i2c.o interrupts.o speed.o usb.o usb_ohci.o nand.o +COBJS = interrupts.o speed.o usb.o usb_ohci.o nand.o SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c) OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS)) diff --git a/cpu/arm920t/s3c24x0/i2c.c b/cpu/arm920t/s3c24x0/i2c.c deleted file mode 100644 index fba5cd1b5f..0000000000 --- a/cpu/arm920t/s3c24x0/i2c.c +++ /dev/null @@ -1,447 +0,0 @@ -/* - * (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 - -#ifdef CONFIG_DRIVER_S3C24X0_I2C - -#if defined(CONFIG_S3C2400) -#include -#elif defined(CONFIG_S3C2410) -#include -#endif -#include - -#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 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 */ - -#endif /* CONFIG_DRIVER_S3C24X0_I2C */ diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index 4b4d9db9ec..ef32f13377 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -32,6 +32,7 @@ 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/s3c24x0_i2c.c b/drivers/i2c/s3c24x0_i2c.c new file mode 100644 index 0000000000..f0c1aa3406 --- /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 +#if defined(CONFIG_S3C2400) +#include +#elif defined(CONFIG_S3C2410) +#include +#endif +#include + +#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 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 */