X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=drivers%2Fi2c%2Fs3c24x0_i2c.c;h=55c6a12aaed1d92116affa1ba8cae953f5ec8700;hb=08a1c6258c2a04cead33eac50d96ea89979dcb94;hp=f0c1aa34066f93d064a71852d3ea1d8df0dbc9cf;hpb=dfc91c33957c95da34e3888dc87912d5c15a7603;p=u-boot diff --git a/drivers/i2c/s3c24x0_i2c.c b/drivers/i2c/s3c24x0_i2c.c index f0c1aa3406..55c6a12aae 100644 --- a/drivers/i2c/s3c24x0_i2c.c +++ b/drivers/i2c/s3c24x0_i2c.c @@ -32,6 +32,8 @@ #elif defined(CONFIG_S3C2410) #include #endif + +#include #include #ifdef CONFIG_HARD_I2C @@ -42,142 +44,139 @@ #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_NOK_LA 3 /* Lost arbitration */ +#define I2C_NOK_TOUT 4 /* time out */ -#define I2C_TIMEOUT 1 /* 1 second */ +#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(); + struct s3c24x0_gpio *gpio = s3c24x0_get_base_gpio(); #ifdef CONFIG_S3C2410 - return (gpio->GPEDAT & 0x8000) >> 15; + return (readl(&gpio->GPEDAT) & 0x8000) >> 15; #endif #ifdef CONFIG_S3C2400 - return (gpio->PGDAT & 0x0020) >> 5; + return (readl(&gpio->PGDAT) & 0x0020) >> 5; #endif } #if 0 static void SetI2CSDA(int x) { - rGPEDAT = (rGPEDAT & ~0x8000) | (x&1) << 15; + rGPEDAT = (rGPEDAT & ~0x8000) | (x & 1) << 15; } #endif static void SetI2CSCL(int x) { - S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO(); + struct s3c24x0_gpio *gpio = s3c24x0_get_base_gpio(); #ifdef CONFIG_S3C2410 - gpio->GPEDAT = (gpio->GPEDAT & ~0x4000) | (x&1) << 14; + writel((readl(&gpio->GPEDAT) & ~0x4000) | (x & 1) << 14, &gpio->GPEDAT); #endif #ifdef CONFIG_S3C2400 - gpio->PGDAT = (gpio->PGDAT & ~0x0040) | (x&1) << 6; + writel((readl(&gpio->PGDAT) & ~0x0040) | (x & 1) << 6, &gpio->PGDAT); #endif } - -static int WaitForXfer (void) +static int WaitForXfer(void) { - S3C24X0_I2C *const i2c = S3C24X0_GetBase_I2C (); - int i, status; + struct s3c24x0_i2c *i2c = s3c24x0_get_base_i2c(); + int i; i = I2C_TIMEOUT * 10000; - status = i2c->IICCON; - while ((i > 0) && !(status & I2CCON_IRPND)) { - udelay (100); - status = i2c->IICCON; + while (!(readl(&i2c->IICCON) & I2CCON_IRPND) && (i > 0)) { + udelay(100); i--; } - return (status & I2CCON_IRPND) ? I2C_OK : I2C_NOK_TOUT; + return (readl(&i2c->IICCON) & I2CCON_IRPND) ? I2C_OK : I2C_NOK_TOUT; } -static int IsACK (void) +static int IsACK(void) { - S3C24X0_I2C *const i2c = S3C24X0_GetBase_I2C (); + struct s3c24x0_i2c *i2c = s3c24x0_get_base_i2c(); - return (!(i2c->IICSTAT & I2CSTAT_NACK)); + return !(readl(&i2c->IICSTAT) & I2CSTAT_NACK); } -static void ReadWriteByte (void) +static void ReadWriteByte(void) { - S3C24X0_I2C *const i2c = S3C24X0_GetBase_I2C (); + struct s3c24x0_i2c *i2c = s3c24x0_get_base_i2c(); - i2c->IICCON &= ~I2CCON_IRPND; + writel(readl(&i2c->IICCON) & ~I2CCON_IRPND, &i2c->IICCON); } -void i2c_init (int speed, int slaveadd) +void i2c_init(int speed, int slaveadd) { - S3C24X0_I2C *const i2c = S3C24X0_GetBase_I2C (); - S3C24X0_GPIO *const gpio = S3C24X0_GetBase_GPIO (); + struct s3c24x0_i2c *i2c = s3c24x0_get_base_i2c(); + struct s3c24x0_gpio *gpio = s3c24x0_get_base_gpio(); ulong freq, pres = 16, div; - int i, status; + int i; /* 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; + while ((readl(&i2c->IICSTAT) && I2CSTAT_BSY) && (i > 0)) { + udelay(1000); i--; } - if ((status & I2CSTAT_BSY) || GetI2CSDA () == 0) { + if ((readl(&i2c->IICSTAT) & I2CSTAT_BSY) || GetI2CSDA() == 0) { #ifdef CONFIG_S3C2410 - ulong old_gpecon = gpio->GPECON; + ulong old_gpecon = readl(&gpio->GPECON); #endif #ifdef CONFIG_S3C2400 - ulong old_gpecon = gpio->PGCON; + ulong old_gpecon = readl(&gpio->PGCON); #endif - /* bus still busy probably by (most) previously interrupted transfer */ + /* 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; + writel((readl(&gpio->GPECON) & ~0xF0000000) | 0x10000000, + &gpio->GPECON); #endif #ifdef CONFIG_S3C2400 /* set I2CSDA and I2CSCL (PG5, PG6) to GPIO */ - gpio->PGCON = (gpio->PGCON & ~0x00003c00) | 0x00001000; + writel((readl(&gpio->PGCON) & ~0x00003c00) | 0x00001000, + &gpio->PGCON); #endif /* toggle I2CSCL until bus idle */ - SetI2CSCL (0); - udelay (1000); + SetI2CSCL(0); + udelay(1000); i = 10; - while ((i > 0) && (GetI2CSDA () != 1)) { - SetI2CSCL (1); - udelay (1000); - SetI2CSCL (0); - udelay (1000); + while ((i > 0) && (GetI2CSDA() != 1)) { + SetI2CSCL(1); + udelay(1000); + SetI2CSCL(0); + udelay(1000); i--; } - SetI2CSCL (1); - udelay (1000); + SetI2CSCL(1); + udelay(1000); /* restore pin functions */ #ifdef CONFIG_S3C2410 - gpio->GPECON = old_gpecon; + writel(old_gpecon, &gpio->GPECON); #endif #ifdef CONFIG_S3C2400 - gpio->PGCON = old_gpecon; + writel(old_gpecon, &gpio->PGCON); #endif } /* calculate prescaler and divisor values */ - freq = get_PCLK (); + freq = get_PCLK(); if ((freq / pres / (16 + 1)) > speed) /* set prescaler to 512 */ pres = 512; @@ -188,13 +187,13 @@ void i2c_init (int speed, int slaveadd) /* set prescaler, divisor according to freq, also set * ACKGEN, IRQ */ - i2c->IICCON = (div & 0x0F) | 0xA0 | ((pres == 512) ? 0x40 : 0); + writel((div & 0x0F) | 0xA0 | ((pres == 512) ? 0x40 : 0), &i2c->IICCON); /* init to SLAVE REVEIVE and set slaveaddr */ - i2c->IICSTAT = 0; - i2c->IICADD = slaveadd; + writel(0, &i2c->IICSTAT); + writel(slaveadd, &i2c->IICADD); /* program Master Transmit (and implicit STOP) */ - i2c->IICSTAT = I2C_MODE_MT | I2C_TXRX_ENA; + writel(I2C_MODE_MT | I2C_TXRX_ENA, &i2c->IICSTAT); } @@ -206,107 +205,109 @@ void i2c_init (int speed, int slaveadd) * 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) +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; + struct s3c24x0_i2c *i2c = s3c24x0_get_base_i2c(); + int i, 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"); + 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; + while ((readl(&i2c->IICSTAT) & I2CSTAT_BSY) && (i > 0)) { + udelay(1000); i--; } - if (status & I2CSTAT_BSY) + if (readl(&i2c->IICSTAT) & I2CSTAT_BSY) return I2C_NOK_TOUT; - i2c->IICCON |= 0x80; + writel(readl(&i2c->IICCON) | 0x80, &i2c->IICCON); result = I2C_OK; switch (cmd_type) { case I2C_WRITE: if (addr && addr_len) { - i2c->IICDS = chip; + writel(chip, &i2c->IICDS); /* send START */ - i2c->IICSTAT = I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP; + writel(I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP, + &i2c->IICSTAT); i = 0; while ((i < addr_len) && (result == I2C_OK)) { - result = WaitForXfer (); - i2c->IICDS = addr[i]; - ReadWriteByte (); + result = WaitForXfer(); + writel(addr[i], &i2c->IICDS); + ReadWriteByte(); i++; } i = 0; while ((i < data_len) && (result == I2C_OK)) { - result = WaitForXfer (); - i2c->IICDS = data[i]; - ReadWriteByte (); + result = WaitForXfer(); + writel(data[i], &i2c->IICDS); + ReadWriteByte(); i++; } } else { - i2c->IICDS = chip; + writel(chip, &i2c->IICDS); /* send START */ - i2c->IICSTAT = I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP; + writel(I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP, + &i2c->IICSTAT); i = 0; while ((i < data_len) && (result = I2C_OK)) { - result = WaitForXfer (); - i2c->IICDS = data[i]; - ReadWriteByte (); + result = WaitForXfer(); + writel(data[i], &i2c->IICDS); + ReadWriteByte(); i++; } } if (result == I2C_OK) - result = WaitForXfer (); + result = WaitForXfer(); /* send STOP */ - i2c->IICSTAT = I2C_MODE_MR | I2C_TXRX_ENA; - ReadWriteByte (); + writel(I2C_MODE_MR | I2C_TXRX_ENA, &i2c->IICSTAT); + ReadWriteByte(); break; case I2C_READ: if (addr && addr_len) { - i2c->IICSTAT = I2C_MODE_MT | I2C_TXRX_ENA; - i2c->IICDS = chip; + writel(I2C_MODE_MT | I2C_TXRX_ENA, &i2c->IICSTAT); + writel(chip, &i2c->IICDS); /* send START */ - i2c->IICSTAT |= I2C_START_STOP; - result = WaitForXfer (); - if (IsACK ()) { + writel(readl(&i2c->IICSTAT) | I2C_START_STOP, + &i2c->IICSTAT); + result = WaitForXfer(); + if (IsACK()) { i = 0; while ((i < addr_len) && (result == I2C_OK)) { - i2c->IICDS = addr[i]; - ReadWriteByte (); - result = WaitForXfer (); + writel(addr[i], &i2c->IICDS); + ReadWriteByte(); + result = WaitForXfer(); i++; } - i2c->IICDS = chip; + writel(chip, &i2c->IICDS); /* resend START */ - i2c->IICSTAT = I2C_MODE_MR | I2C_TXRX_ENA | - I2C_START_STOP; - ReadWriteByte (); - result = WaitForXfer (); + writel(I2C_MODE_MR | I2C_TXRX_ENA | + I2C_START_STOP, &i2c->IICSTAT); + 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; + writel(readl(&i2c->IICCON) + & ~0x80, &i2c->IICCON); + ReadWriteByte(); + result = WaitForXfer(); + data[i] = readl(&i2c->IICDS); i++; } } else { @@ -314,21 +315,23 @@ int i2c_transfer (unsigned char cmd_type, } } else { - i2c->IICSTAT = I2C_MODE_MR | I2C_TXRX_ENA; - i2c->IICDS = chip; + writel(I2C_MODE_MR | I2C_TXRX_ENA, &i2c->IICSTAT); + writel(chip, &i2c->IICDS); /* send START */ - i2c->IICSTAT |= I2C_START_STOP; - result = WaitForXfer (); + writel(readl(&i2c->IICSTAT) | I2C_START_STOP, + &i2c->IICSTAT); + result = WaitForXfer(); - if (IsACK ()) { + 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; + writel(readl(&i2c->IICCON) & + ~0x80, &i2c->IICCON); + ReadWriteByte(); + result = WaitForXfer(); + data[i] = readl(&i2c->IICDS); i++; } } else { @@ -337,12 +340,12 @@ int i2c_transfer (unsigned char cmd_type, } /* send STOP */ - i2c->IICSTAT = I2C_MODE_MR | I2C_TXRX_ENA; - ReadWriteByte (); + writel(I2C_MODE_MR | I2C_TXRX_ENA, &i2c->IICSTAT); + ReadWriteByte(); break; default: - printf ("i2c_transfer: bad call\n"); + printf("i2c_transfer: bad call\n"); result = I2C_NOK; break; } @@ -350,7 +353,7 @@ int i2c_transfer (unsigned char cmd_type, return (result); } -int i2c_probe (uchar chip) +int i2c_probe(uchar chip) { uchar buf[1]; @@ -361,16 +364,16 @@ int i2c_probe (uchar chip) * 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); + 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) +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); + printf("I2C read: addr len %d not supported\n", alen); return 1; } @@ -394,23 +397,24 @@ int i2c_read (uchar chip, uint addr, int alen, uchar * buffer, int len) * hidden in the chip address. */ if (alen > 0) - chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW); + 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); + 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) +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); + printf("I2C write: addr len %d not supported\n", alen); return 1; } @@ -433,10 +437,11 @@ int i2c_write (uchar chip, uint addr, int alen, uchar * buffer, int len) * hidden in the chip address. */ if (alen > 0) - chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW); + 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_HARD_I2C */