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-rw-r--r--drivers/i2c/fti2c010.c299
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, &regs->cr);
+ for (ts = get_timer(0); get_timer(ts) < CONFIG_FTI2C010_TIMEOUT; ) {
+ if (!(readl(&regs->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(&regs->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), &regs->tgsr);
+ writel(CDR_DIV(div), &regs->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), &regs->dr);
+ writel(I2C_WR(dev), &regs->dr);
writel(CR_ENABLE | CR_TBEN | CR_START, &regs->cr);
- ret = fti2c010_wait(SR_DT);
+ ret = fti2c010_wait(chip, SR_DT);
if (ret)
return ret;
/* 2. Select device register */
writel(0, &regs->dr);
writel(CR_ENABLE | CR_TBEN, &regs->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), &regs->dr);
+ writel(I2C_WR(dev), &regs->dr);
writel(CR_ENABLE | CR_TBEN | CR_START, &regs->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], &regs->dr);
writel(ctrl, &regs->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), &regs->dr);
+ writel(I2C_RD(dev), &regs->dr);
writel(CR_ENABLE | CR_TBEN | CR_START, &regs->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, &regs->cr);
- ret = fti2c010_wait(stat);
+ ret = fti2c010_wait(chip, stat);
if (ret)
break;
buf[pos] = (uchar)(readl(&regs->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), &regs->dr);
+ writel(I2C_WR(dev), &regs->dr);
writel(CR_ENABLE | CR_TBEN | CR_START, &regs->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], &regs->dr);
writel(ctrl, &regs->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], &regs->dr);
writel(ctrl, &regs->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, &regs->cr);
- mdelay(100);
- if (readl(&regs->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), &regs->tgsr);
- writel(CDR_DIV(div), &regs->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
generated by cgit v1.1 at 2024-12-21 14:54:45 +0000