diff options
| -rw-r--r-- | drivers/i2c/fti2c010.c | 299 |
1 files changed, 133 insertions, 166 deletions
diff --git a/drivers/i2c/fti2c010.c b/drivers/i2c/fti2c010.c index ec6afc9..eccc1da 100644 --- a/drivers/i2c/fti2c010.c +++ b/drivers/i2c/fti2c010.c @@ -13,14 +13,14 @@ #include "fti2c010.h" -#ifndef CONFIG_HARD_I2C -#error "fti2c010: CONFIG_HARD_I2C is not defined" -#endif - #ifndef CONFIG_SYS_I2C_SPEED #define CONFIG_SYS_I2C_SPEED 5000 #endif +#ifndef CONFIG_SYS_I2C_SLAVE +#define CONFIG_SYS_I2C_SLAVE 0 +#endif + #ifndef CONFIG_FTI2C010_CLOCK #define CONFIG_FTI2C010_CLOCK clk_get_rate("I2C") #endif @@ -35,44 +35,54 @@ struct fti2c010_chip { struct fti2c010_regs *regs; - uint bus; - uint speed; }; static struct fti2c010_chip chip_list[] = { { - .bus = 0, .regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE, }, -#ifdef CONFIG_I2C_MULTI_BUS -# ifdef CONFIG_FTI2C010_BASE1 +#ifdef CONFIG_FTI2C010_BASE1 { - .bus = 1, .regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE1, }, -# endif -# ifdef CONFIG_FTI2C010_BASE2 +#endif +#ifdef CONFIG_FTI2C010_BASE2 { - .bus = 2, .regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE2, }, -# endif -# ifdef CONFIG_FTI2C010_BASE3 +#endif +#ifdef CONFIG_FTI2C010_BASE3 { - .bus = 3, .regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE3, }, -# endif -#endif /* #ifdef CONFIG_I2C_MULTI_BUS */ +#endif }; -static struct fti2c010_chip *curr = chip_list; +static int fti2c010_reset(struct fti2c010_chip *chip) +{ + ulong ts; + int ret = -1; + struct fti2c010_regs *regs = chip->regs; -static int fti2c010_wait(uint32_t mask) + writel(CR_I2CRST, ®s->cr); + for (ts = get_timer(0); get_timer(ts) < CONFIG_FTI2C010_TIMEOUT; ) { + if (!(readl(®s->cr) & CR_I2CRST)) { + ret = 0; + break; + } + } + + if (ret) + printf("fti2c010: reset timeout\n"); + + return ret; +} + +static int fti2c010_wait(struct fti2c010_chip *chip, uint32_t mask) { int ret = -1; uint32_t stat, ts; - struct fti2c010_regs *regs = curr->regs; + struct fti2c010_regs *regs = chip->regs; for (ts = get_timer(0); get_timer(ts) < CONFIG_FTI2C010_TIMEOUT; ) { stat = readl(®s->sr); @@ -85,74 +95,97 @@ static int fti2c010_wait(uint32_t mask) return ret; } -/* - * u-boot I2C API - */ +static unsigned int set_i2c_bus_speed(struct fti2c010_chip *chip, + unsigned int speed) +{ + struct fti2c010_regs *regs = chip->regs; + unsigned int clk = CONFIG_FTI2C010_CLOCK; + unsigned int gsr = 0; + unsigned int tsr = 32; + unsigned int div, rate; + + for (div = 0; div < 0x3ffff; ++div) { + /* SCLout = PCLK/(2*(COUNT + 2) + GSR) */ + rate = clk / (2 * (div + 2) + gsr); + if (rate <= speed) + break; + } + + writel(TGSR_GSR(gsr) | TGSR_TSR(tsr), ®s->tgsr); + writel(CDR_DIV(div), ®s->cdr); + + return rate; +} /* * 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) +static void fti2c010_init(struct i2c_adapter *adap, int speed, int slaveaddr) { - if (speed || !curr->speed) - i2c_set_bus_speed(speed); + struct fti2c010_chip *chip = chip_list + adap->hwadapnr; - /* if slave mode disabled */ - if (!slaveaddr) + if (adap->init_done) return; - /* - * TODO: - * Implement slave mode, but is it really necessary? - */ +#ifdef CONFIG_SYS_I2C_INIT_BOARD + /* Call board specific i2c bus reset routine before accessing the + * environment, which might be in a chip on that bus. For details + * about this problem see doc/I2C_Edge_Conditions. + */ + i2c_init_board(); +#endif + + /* master init */ + + fti2c010_reset(chip); + + set_i2c_bus_speed(chip, speed); + + /* slave init, don't care */ + +#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT + /* Call board specific i2c bus reset routine AFTER the bus has been + * initialized. Use either this callpoint or i2c_init_board; + * which is called before fti2c010_init operations. + * For details about this problem see doc/I2C_Edge_Conditions. + */ + i2c_board_late_init(); +#endif } /* * Probe the given I2C chip address. Returns 0 if a chip responded, * not 0 on failure. */ -int i2c_probe(uchar chip) +static int fti2c010_probe(struct i2c_adapter *adap, u8 dev) { + struct fti2c010_chip *chip = chip_list + adap->hwadapnr; + struct fti2c010_regs *regs = chip->regs; int ret; - struct fti2c010_regs *regs = curr->regs; - - i2c_init(0, 0); /* 1. Select slave device (7bits Address + 1bit R/W) */ - writel(I2C_WR(chip), ®s->dr); + writel(I2C_WR(dev), ®s->dr); writel(CR_ENABLE | CR_TBEN | CR_START, ®s->cr); - ret = fti2c010_wait(SR_DT); + ret = fti2c010_wait(chip, SR_DT); if (ret) return ret; /* 2. Select device register */ writel(0, ®s->dr); writel(CR_ENABLE | CR_TBEN, ®s->cr); - ret = fti2c010_wait(SR_DT); + ret = fti2c010_wait(chip, SR_DT); return ret; } -/* - * 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 - */ -int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) +static int fti2c010_read(struct i2c_adapter *adap, + u8 dev, uint addr, int alen, uchar *buf, int len) { + struct fti2c010_chip *chip = chip_list + adap->hwadapnr; + struct fti2c010_regs *regs = chip->regs; int ret, pos; uchar paddr[4]; - struct fti2c010_regs *regs = curr->regs; - - i2c_init(0, 0); paddr[0] = (addr >> 0) & 0xFF; paddr[1] = (addr >> 8) & 0xFF; @@ -164,9 +197,9 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) */ /* A.1 Select slave device (7bits Address + 1bit R/W) */ - writel(I2C_WR(chip), ®s->dr); + writel(I2C_WR(dev), ®s->dr); writel(CR_ENABLE | CR_TBEN | CR_START, ®s->cr); - ret = fti2c010_wait(SR_DT); + ret = fti2c010_wait(chip, SR_DT); if (ret) return ret; @@ -176,7 +209,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) writel(paddr[pos], ®s->dr); writel(ctrl, ®s->cr); - ret = fti2c010_wait(SR_DT); + ret = fti2c010_wait(chip, SR_DT); if (ret) return ret; } @@ -186,9 +219,9 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) */ /* B.1 Select slave device (7bits Address + 1bit R/W) */ - writel(I2C_RD(chip), ®s->dr); + writel(I2C_RD(dev), ®s->dr); writel(CR_ENABLE | CR_TBEN | CR_START, ®s->cr); - ret = fti2c010_wait(SR_DT); + ret = fti2c010_wait(chip, SR_DT); if (ret) return ret; @@ -202,7 +235,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) stat |= SR_ACK; } writel(ctrl, ®s->cr); - ret = fti2c010_wait(stat); + ret = fti2c010_wait(chip, stat); if (ret) break; buf[pos] = (uchar)(readl(®s->dr) & 0xFF); @@ -211,25 +244,13 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) return ret; } -/* - * 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 - */ -int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) +static int fti2c010_write(struct i2c_adapter *adap, + u8 dev, uint addr, int alen, u8 *buf, int len) { + struct fti2c010_chip *chip = chip_list + adap->hwadapnr; + struct fti2c010_regs *regs = chip->regs; int ret, pos; uchar paddr[4]; - struct fti2c010_regs *regs = curr->regs; - - i2c_init(0, 0); paddr[0] = (addr >> 0) & 0xFF; paddr[1] = (addr >> 8) & 0xFF; @@ -241,9 +262,9 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) * * A.1 Select slave device (7bits Address + 1bit R/W) */ - writel(I2C_WR(chip), ®s->dr); + writel(I2C_WR(dev), ®s->dr); writel(CR_ENABLE | CR_TBEN | CR_START, ®s->cr); - ret = fti2c010_wait(SR_DT); + ret = fti2c010_wait(chip, SR_DT); if (ret) return ret; @@ -253,7 +274,7 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) writel(paddr[pos], ®s->dr); writel(ctrl, ®s->cr); - ret = fti2c010_wait(SR_DT); + ret = fti2c010_wait(chip, SR_DT); if (ret) return ret; } @@ -268,7 +289,7 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) ctrl |= CR_STOP; writel(buf[pos], ®s->dr); writel(ctrl, ®s->cr); - ret = fti2c010_wait(SR_DT); + ret = fti2c010_wait(chip, SR_DT); if (ret) break; } @@ -276,94 +297,40 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) return ret; } -/* - * Functions for setting the current I2C bus and its speed - */ -#ifdef CONFIG_I2C_MULTI_BUS - -/* - * i2c_set_bus_num: - * - * Change the active I2C bus. Subsequent read/write calls will - * go to this one. - * - * bus - bus index, zero based - * - * Returns: 0 on success, not 0 on failure - */ -int i2c_set_bus_num(uint bus) -{ - if (bus >= ARRAY_SIZE(chip_list)) - return -1; - curr = chip_list + bus; - i2c_init(0, 0); - return 0; -} - -/* - * i2c_get_bus_num: - * - * Returns index of currently active I2C bus. Zero-based. - */ - -uint i2c_get_bus_num(void) -{ - return curr->bus; -} - -#endif /* #ifdef CONFIG_I2C_MULTI_BUS */ - -/* - * i2c_set_bus_speed: - * - * Change the speed of the active I2C bus - * - * speed - bus speed in Hz - * - * Returns: 0 on success, not 0 on failure - */ -int i2c_set_bus_speed(uint speed) +static unsigned int fti2c010_set_bus_speed(struct i2c_adapter *adap, + unsigned int speed) { - struct fti2c010_regs *regs = curr->regs; - uint clk = CONFIG_FTI2C010_CLOCK; - uint gsr = 0, tsr = 32; - uint spd, div; - - if (!speed) - speed = CONFIG_SYS_I2C_SPEED; - - for (div = 0; div < 0x3ffff; ++div) { - /* SCLout = PCLK/(2*(COUNT + 2) + GSR) */ - spd = clk / (2 * (div + 2) + gsr); - if (spd <= speed) - break; - } - - if (curr->speed == spd) - return 0; - - writel(CR_I2CRST, ®s->cr); - mdelay(100); - if (readl(®s->cr) & CR_I2CRST) { - printf("fti2c010: reset timeout\n"); - return -1; - } - - curr->speed = spd; + struct fti2c010_chip *chip = chip_list + adap->hwadapnr; + int ret; - writel(TGSR_GSR(gsr) | TGSR_TSR(tsr), ®s->tgsr); - writel(CDR_DIV(div), ®s->cdr); + fti2c010_reset(chip); + ret = set_i2c_bus_speed(chip, speed); - return 0; + return ret; } /* - * i2c_get_bus_speed: - * - * Returns speed of currently active I2C bus in Hz + * Register i2c adapters */ - -uint i2c_get_bus_speed(void) -{ - return curr->speed; -} +U_BOOT_I2C_ADAP_COMPLETE(i2c_0, fti2c010_init, fti2c010_probe, fti2c010_read, + fti2c010_write, fti2c010_set_bus_speed, + CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE, + 0) +#ifdef CONFIG_FTI2C010_BASE1 +U_BOOT_I2C_ADAP_COMPLETE(i2c_1, fti2c010_init, fti2c010_probe, fti2c010_read, + fti2c010_write, fti2c010_set_bus_speed, + CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE, + 1) +#endif +#ifdef CONFIG_FTI2C010_BASE2 +U_BOOT_I2C_ADAP_COMPLETE(i2c_2, fti2c010_init, fti2c010_probe, fti2c010_read, + fti2c010_write, fti2c010_set_bus_speed, + CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE, + 2) +#endif +#ifdef CONFIG_FTI2C010_BASE3 +U_BOOT_I2C_ADAP_COMPLETE(i2c_3, fti2c010_init, fti2c010_probe, fti2c010_read, + fti2c010_write, fti2c010_set_bus_speed, + CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE, + 3) +#endif |