diff options
Diffstat (limited to 'drivers/i2c/fti2c010.c')
| -rw-r--r-- | drivers/i2c/fti2c010.c | 352 |
1 files changed, 165 insertions, 187 deletions
diff --git a/drivers/i2c/fti2c010.c b/drivers/i2c/fti2c010.c index ddeb941..fb9fa35 100644 --- a/drivers/i2c/fti2c010.c +++ b/drivers/i2c/fti2c010.c @@ -13,67 +13,78 @@ #include "fti2c010.h" -#ifndef CONFIG_HARD_I2C -#error "fti2c010: CONFIG_HARD_I2C is not defined" +#ifndef CONFIG_SYS_I2C_SPEED +#define CONFIG_SYS_I2C_SPEED 5000 #endif -#ifndef CONFIG_SYS_I2C_SPEED -#define CONFIG_SYS_I2C_SPEED 50000 +#ifndef CONFIG_SYS_I2C_SLAVE +#define CONFIG_SYS_I2C_SLAVE 0 #endif -#ifndef CONFIG_FTI2C010_FREQ -#define CONFIG_FTI2C010_FREQ clk_get_rate("I2C") +#ifndef CONFIG_FTI2C010_CLOCK +#define CONFIG_FTI2C010_CLOCK clk_get_rate("I2C") #endif -/* command timeout */ -#define CFG_CMD_TIMEOUT 10 /* ms */ +#ifndef CONFIG_FTI2C010_TIMEOUT +#define CONFIG_FTI2C010_TIMEOUT 10 /* ms */ +#endif -/* 7-bit chip address + 1-bit read/write */ -#define I2C_RD(chip) ((((chip) << 1) & 0xff) | 1) -#define I2C_WR(chip) (((chip) << 1) & 0xff) +/* 7-bit dev address + 1-bit read/write */ +#define I2C_RD(dev) ((((dev) << 1) & 0xfe) | 1) +#define I2C_WR(dev) (((dev) << 1) & 0xfe) struct fti2c010_chip { - void __iomem *regs; - uint bus; - uint speed; + struct fti2c010_regs *regs; }; static struct fti2c010_chip chip_list[] = { { - .bus = 0, - .regs = (void __iomem *)CONFIG_FTI2C010_BASE, + .regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE, }, -#ifdef CONFIG_I2C_MULTI_BUS -# ifdef CONFIG_FTI2C010_BASE1 +#ifdef CONFIG_FTI2C010_BASE1 { - .bus = 1, - .regs = (void __iomem *)CONFIG_FTI2C010_BASE1, + .regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE1, }, -# endif -# ifdef CONFIG_FTI2C010_BASE2 +#endif +#ifdef CONFIG_FTI2C010_BASE2 { - .bus = 2, - .regs = (void __iomem *)CONFIG_FTI2C010_BASE2, + .regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE2, }, -# endif -# ifdef CONFIG_FTI2C010_BASE3 +#endif +#ifdef CONFIG_FTI2C010_BASE3 { - .bus = 3, - .regs = (void __iomem *)CONFIG_FTI2C010_BASE3, + .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; + + 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; + } + } -static int fti2c010_wait(uint32_t mask) + 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) < CFG_CMD_TIMEOUT; ) { + for (ts = get_timer(0); get_timer(ts) < CONFIG_FTI2C010_TIMEOUT; ) { stat = readl(®s->sr); if ((stat & mask) == mask) { ret = 0; @@ -84,88 +95,124 @@ 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 void to_i2c_addr(u8 *buf, uint32_t addr, int alen) +{ + int i, shift; + + if (!buf || alen <= 0) + return; + + /* MSB first */ + i = 0; + shift = (alen - 1) * 8; + while (alen-- > 0) { + buf[i] = (u8)(addr >> shift); + shift -= 8; + } +} + +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; - paddr[2] = (addr >> 16) & 0xFF; - paddr[3] = (addr >> 24) & 0xFF; + to_i2c_addr(paddr, addr, alen); /* * Phase A. Set register address */ /* 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; @@ -175,7 +222,7 @@ 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; } @@ -185,9 +232,9 @@ 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; @@ -201,7 +248,7 @@ 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); @@ -210,39 +257,24 @@ 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; - paddr[2] = (addr >> 16) & 0xFF; - paddr[3] = (addr >> 24) & 0xFF; + to_i2c_addr(paddr, addr, alen); /* * Phase A. Set register address * * 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; @@ -252,7 +284,7 @@ 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; } @@ -267,7 +299,7 @@ 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; } @@ -275,94 +307,40 @@ 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_FREQ; - 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; - } + struct fti2c010_chip *chip = chip_list + adap->hwadapnr; + int ret; - curr->speed = spd; + fti2c010_reset(chip); + ret = set_i2c_bus_speed(chip, speed); - writel(TGSR_GSR(gsr) | TGSR_TSR(tsr), ®s->tgsr); - writel(CDR_DIV(div), ®s->cdr); - - 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 |