+// SPDX-License-Identifier: GPL-2.0+
/*
* LPC32xx I2C interface driver
*
* (C) Copyright 2014-2015 DENX Software Engineering GmbH
* Written-by: Albert ARIBAUD - 3ADEV <albert.aribaud@3adev.fr>
- *
- * SPDX-License-Identifier: GPL-2.0+
- *
- * NOTE: This driver should be converted to driver model before June 2017.
- * Please see doc/driver-model/i2c-howto.txt for instructions.
*/
#include <common.h>
+#include <log.h>
#include <asm/io.h>
#include <i2c.h>
#include <linux/errno.h>
#include <asm/arch/clk.h>
+#include <asm/arch/i2c.h>
+#include <dm.h>
+#include <mapmem.h>
/*
* Provide default speed and slave if target did not
#define CONFIG_SYS_I2C_LPC32XX_SLAVE 0
#endif
-/* i2c register set */
-struct lpc32xx_i2c_registers {
- union {
- u32 rx;
- u32 tx;
- };
- u32 stat;
- u32 ctrl;
- u32 clk_hi;
- u32 clk_lo;
- u32 adr;
- u32 rxfl;
- u32 txfl;
- u32 rxb;
- u32 txb;
- u32 stx;
- u32 stxfl;
-};
-
/* TX register fields */
#define LPC32XX_I2C_TX_START 0x00000100
#define LPC32XX_I2C_TX_STOP 0x00000200
#define LPC32XX_I2C_STAT_NAI 0x00000004
#define LPC32XX_I2C_STAT_TDI 0x00000001
-static struct lpc32xx_i2c_registers *lpc32xx_i2c[] = {
- (struct lpc32xx_i2c_registers *)I2C1_BASE,
- (struct lpc32xx_i2c_registers *)I2C2_BASE,
- (struct lpc32xx_i2c_registers *)(USB_BASE + 0x300)
+#ifndef CONFIG_DM_I2C
+static struct lpc32xx_i2c_base *lpc32xx_i2c[] = {
+ (struct lpc32xx_i2c_base *)I2C1_BASE,
+ (struct lpc32xx_i2c_base *)I2C2_BASE,
+ (struct lpc32xx_i2c_base *)(USB_BASE + 0x300)
};
+#endif
/* Set I2C bus speed */
-static unsigned int lpc32xx_i2c_set_bus_speed(struct i2c_adapter *adap,
- unsigned int speed)
+static unsigned int __i2c_set_bus_speed(struct lpc32xx_i2c_base *base,
+ unsigned int speed, unsigned int chip)
{
int half_period;
return -EINVAL;
/* OTG I2C clock source and CLK registers are different */
- if (adap->hwadapnr == 2) {
+ if (chip == 2) {
half_period = (get_periph_clk_rate() / speed) / 2;
if (half_period > 0xFF)
return -EINVAL;
return -EINVAL;
}
- writel(half_period, &lpc32xx_i2c[adap->hwadapnr]->clk_hi);
- writel(half_period, &lpc32xx_i2c[adap->hwadapnr]->clk_lo);
+ writel(half_period, &base->clk_hi);
+ writel(half_period, &base->clk_lo);
return 0;
}
/* I2C init called by cmd_i2c when doing 'i2c reset'. */
-static void _i2c_init(struct i2c_adapter *adap,
- int requested_speed, int slaveadd)
+static void __i2c_init(struct lpc32xx_i2c_base *base,
+ int requested_speed, int slaveadd, unsigned int chip)
{
- struct lpc32xx_i2c_registers *i2c = lpc32xx_i2c[adap->hwadapnr];
-
/* soft reset (auto-clears) */
- writel(LPC32XX_I2C_SOFT_RESET, &i2c->ctrl);
+ writel(LPC32XX_I2C_SOFT_RESET, &base->ctrl);
/* set HI and LO periods for half of the default speed */
- lpc32xx_i2c_set_bus_speed(adap, requested_speed);
+ __i2c_set_bus_speed(base, requested_speed, chip);
}
/* I2C probe called by cmd_i2c when doing 'i2c probe'. */
-static int lpc32xx_i2c_probe(struct i2c_adapter *adap, u8 dev)
+static int __i2c_probe_chip(struct lpc32xx_i2c_base *base, u8 dev)
{
- struct lpc32xx_i2c_registers *i2c = lpc32xx_i2c[adap->hwadapnr];
int stat;
/* Soft-reset the controller */
- writel(LPC32XX_I2C_SOFT_RESET, &i2c->ctrl);
- while (readl(&i2c->ctrl) & LPC32XX_I2C_SOFT_RESET)
+ writel(LPC32XX_I2C_SOFT_RESET, &base->ctrl);
+ while (readl(&base->ctrl) & LPC32XX_I2C_SOFT_RESET)
;
/* Addre slave for write with start before and stop after */
writel((dev<<1) | LPC32XX_I2C_TX_START | LPC32XX_I2C_TX_STOP,
- &i2c->tx);
+ &base->tx);
/* wait for end of transation */
- while (!((stat = readl(&i2c->stat)) & LPC32XX_I2C_STAT_TDI))
+ while (!((stat = readl(&base->stat)) & LPC32XX_I2C_STAT_TDI))
;
/* was there no acknowledge? */
return (stat & LPC32XX_I2C_STAT_NAI) ? -1 : 0;
* I2C read called by cmd_i2c when doing 'i2c read' and by cmd_eeprom.c
* Begin write, send address byte(s), begin read, receive data bytes, end.
*/
-static int lpc32xx_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
- int alen, u8 *data, int length)
+static int __i2c_read(struct lpc32xx_i2c_base *base, u8 dev, uint addr,
+ int alen, u8 *data, int length)
{
- struct lpc32xx_i2c_registers *i2c = lpc32xx_i2c[adap->hwadapnr];
int stat, wlen;
/* Soft-reset the controller */
- writel(LPC32XX_I2C_SOFT_RESET, &i2c->ctrl);
- while (readl(&i2c->ctrl) & LPC32XX_I2C_SOFT_RESET)
+ writel(LPC32XX_I2C_SOFT_RESET, &base->ctrl);
+ while (readl(&base->ctrl) & LPC32XX_I2C_SOFT_RESET)
;
/* do we need to write an address at all? */
if (alen) {
/* Address slave in write mode */
- writel((dev<<1) | LPC32XX_I2C_TX_START, &i2c->tx);
+ writel((dev<<1) | LPC32XX_I2C_TX_START, &base->tx);
/* write address bytes */
while (alen--) {
/* compute address byte + stop for the last one */
if (!alen)
a |= LPC32XX_I2C_TX_STOP;
/* Send address byte */
- writel(a, &i2c->tx);
+ writel(a, &base->tx);
}
/* wait for end of transation */
- while (!((stat = readl(&i2c->stat)) & LPC32XX_I2C_STAT_TDI))
+ while (!((stat = readl(&base->stat)) & LPC32XX_I2C_STAT_TDI))
;
/* clear end-of-transaction flag */
- writel(1, &i2c->stat);
+ writel(1, &base->stat);
}
/* do we have to read data at all? */
if (length) {
/* Address slave in read mode */
- writel(1 | (dev<<1) | LPC32XX_I2C_TX_START, &i2c->tx);
+ writel(1 | (dev<<1) | LPC32XX_I2C_TX_START, &base->tx);
wlen = length;
/* get data */
while (length | wlen) {
/* read status for TFF and RFE */
- stat = readl(&i2c->stat);
+ stat = readl(&base->stat);
/* must we, can we write a trigger byte? */
if ((wlen > 0)
& (!(stat & LPC32XX_I2C_STAT_TFF))) {
wlen--;
/* write trigger byte + stop if last */
writel(wlen ? 0 :
- LPC32XX_I2C_TX_STOP, &i2c->tx);
+ LPC32XX_I2C_TX_STOP, &base->tx);
}
/* must we, can we read a data byte? */
if ((length > 0)
& (!(stat & LPC32XX_I2C_STAT_RFE))) {
length--;
/* read byte */
- *(data++) = readl(&i2c->rx);
+ *(data++) = readl(&base->rx);
}
}
/* wait for end of transation */
- while (!((stat = readl(&i2c->stat)) & LPC32XX_I2C_STAT_TDI))
+ while (!((stat = readl(&base->stat)) & LPC32XX_I2C_STAT_TDI))
;
/* clear end-of-transaction flag */
- writel(1, &i2c->stat);
+ writel(1, &base->stat);
}
/* success */
return 0;
* I2C write called by cmd_i2c when doing 'i2c write' and by cmd_eeprom.c
* Begin write, send address byte(s), send data bytes, end.
*/
-static int lpc32xx_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
- int alen, u8 *data, int length)
+static int __i2c_write(struct lpc32xx_i2c_base *base, u8 dev, uint addr,
+ int alen, u8 *data, int length)
{
- struct lpc32xx_i2c_registers *i2c = lpc32xx_i2c[adap->hwadapnr];
int stat;
/* Soft-reset the controller */
- writel(LPC32XX_I2C_SOFT_RESET, &i2c->ctrl);
- while (readl(&i2c->ctrl) & LPC32XX_I2C_SOFT_RESET)
+ writel(LPC32XX_I2C_SOFT_RESET, &base->ctrl);
+ while (readl(&base->ctrl) & LPC32XX_I2C_SOFT_RESET)
;
/* do we need to write anything at all? */
if (alen | length)
/* Address slave in write mode */
- writel((dev<<1) | LPC32XX_I2C_TX_START, &i2c->tx);
+ writel((dev<<1) | LPC32XX_I2C_TX_START, &base->tx);
else
return 0;
/* write address bytes */
while (alen) {
/* wait for transmit fifo not full */
- stat = readl(&i2c->stat);
+ stat = readl(&base->stat);
if (!(stat & LPC32XX_I2C_STAT_TFF)) {
alen--;
int a = (addr >> (8 * alen)) & 0xff;
if (!(alen | length))
a |= LPC32XX_I2C_TX_STOP;
/* Send address byte */
- writel(a, &i2c->tx);
+ writel(a, &base->tx);
}
}
while (length) {
/* wait for transmit fifo not full */
- stat = readl(&i2c->stat);
+ stat = readl(&base->stat);
if (!(stat & LPC32XX_I2C_STAT_TFF)) {
/* compute data byte, add stop if length==0 */
length--;
if (!length)
d |= LPC32XX_I2C_TX_STOP;
/* Send data byte */
- writel(d, &i2c->tx);
+ writel(d, &base->tx);
}
}
/* wait for end of transation */
- while (!((stat = readl(&i2c->stat)) & LPC32XX_I2C_STAT_TDI))
+ while (!((stat = readl(&base->stat)) & LPC32XX_I2C_STAT_TDI))
;
/* clear end-of-transaction flag */
- writel(1, &i2c->stat);
+ writel(1, &base->stat);
return 0;
}
-U_BOOT_I2C_ADAP_COMPLETE(lpc32xx_0, _i2c_init, lpc32xx_i2c_probe,
+#ifndef CONFIG_DM_I2C
+static void lpc32xx_i2c_init(struct i2c_adapter *adap,
+ int requested_speed, int slaveadd)
+{
+ __i2c_init(lpc32xx_i2c[adap->hwadapnr], requested_speed, slaveadd,
+ adap->hwadapnr);
+}
+
+static int lpc32xx_i2c_probe_chip(struct i2c_adapter *adap, u8 dev)
+{
+ return __i2c_probe_chip(lpc32xx_i2c[adap->hwadapnr], dev);
+}
+
+static int lpc32xx_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
+ int alen, u8 *data, int length)
+{
+ return __i2c_read(lpc32xx_i2c[adap->hwadapnr], dev, addr,
+ alen, data, length);
+}
+
+static int lpc32xx_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
+ int alen, u8 *data, int length)
+{
+ return __i2c_write(lpc32xx_i2c[adap->hwadapnr], dev, addr,
+ alen, data, length);
+}
+
+static unsigned int lpc32xx_i2c_set_bus_speed(struct i2c_adapter *adap,
+ unsigned int speed)
+{
+ return __i2c_set_bus_speed(lpc32xx_i2c[adap->hwadapnr], speed,
+ adap->hwadapnr);
+}
+
+U_BOOT_I2C_ADAP_COMPLETE(lpc32xx_0, lpc32xx_i2c_init, lpc32xx_i2c_probe_chip,
lpc32xx_i2c_read, lpc32xx_i2c_write,
lpc32xx_i2c_set_bus_speed,
CONFIG_SYS_I2C_LPC32XX_SPEED,
CONFIG_SYS_I2C_LPC32XX_SLAVE,
0)
-U_BOOT_I2C_ADAP_COMPLETE(lpc32xx_1, _i2c_init, lpc32xx_i2c_probe,
+U_BOOT_I2C_ADAP_COMPLETE(lpc32xx_1, lpc32xx_i2c_init, lpc32xx_i2c_probe_chip,
lpc32xx_i2c_read, lpc32xx_i2c_write,
lpc32xx_i2c_set_bus_speed,
CONFIG_SYS_I2C_LPC32XX_SPEED,
CONFIG_SYS_I2C_LPC32XX_SLAVE,
1)
-U_BOOT_I2C_ADAP_COMPLETE(lpc32xx_2, _i2c_init, NULL,
+U_BOOT_I2C_ADAP_COMPLETE(lpc32xx_2, lpc32xx_i2c_init, NULL,
lpc32xx_i2c_read, lpc32xx_i2c_write,
lpc32xx_i2c_set_bus_speed,
100000,
0,
2)
+#else /* CONFIG_DM_I2C */
+static int lpc32xx_i2c_probe(struct udevice *bus)
+{
+ struct lpc32xx_i2c_dev *dev = dev_get_platdata(bus);
+ bus->seq = dev->index;
+
+ __i2c_init(dev->base, dev->speed, 0, dev->index);
+ return 0;
+}
+
+static int lpc32xx_i2c_probe_chip(struct udevice *bus, u32 chip_addr,
+ u32 chip_flags)
+{
+ struct lpc32xx_i2c_dev *dev = dev_get_platdata(bus);
+ return __i2c_probe_chip(dev->base, chip_addr);
+}
+
+static int lpc32xx_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
+ int nmsgs)
+{
+ struct lpc32xx_i2c_dev *dev = dev_get_platdata(bus);
+ struct i2c_msg *dmsg, *omsg, dummy;
+ uint i = 0, address = 0;
+
+ memset(&dummy, 0, sizeof(struct i2c_msg));
+
+ /* We expect either two messages (one with an offset and one with the
+ * actual data) or one message (just data)
+ */
+ if (nmsgs > 2 || nmsgs == 0) {
+ debug("%s: Only one or two messages are supported.", __func__);
+ return -1;
+ }
+
+ omsg = nmsgs == 1 ? &dummy : msg;
+ dmsg = nmsgs == 1 ? msg : msg + 1;
+
+ /* the address is expected to be a uint, not a array. */
+ address = omsg->buf[0];
+ for (i = 1; i < omsg->len; i++)
+ address = (address << 8) + omsg->buf[i];
+
+ if (dmsg->flags & I2C_M_RD)
+ return __i2c_read(dev->base, dmsg->addr, address,
+ omsg->len, dmsg->buf, dmsg->len);
+ else
+ return __i2c_write(dev->base, dmsg->addr, address,
+ omsg->len, dmsg->buf, dmsg->len);
+}
+
+static int lpc32xx_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
+{
+ struct lpc32xx_i2c_dev *dev = dev_get_platdata(bus);
+ return __i2c_set_bus_speed(dev->base, speed, dev->index);
+}
+
+static int lpc32xx_i2c_reset(struct udevice *bus)
+{
+ struct lpc32xx_i2c_dev *dev = dev_get_platdata(bus);
+
+ __i2c_init(dev->base, dev->speed, 0, dev->index);
+ return 0;
+}
+
+static const struct dm_i2c_ops lpc32xx_i2c_ops = {
+ .xfer = lpc32xx_i2c_xfer,
+ .probe_chip = lpc32xx_i2c_probe_chip,
+ .deblock = lpc32xx_i2c_reset,
+ .set_bus_speed = lpc32xx_i2c_set_bus_speed,
+};
+
+U_BOOT_DRIVER(i2c_lpc32xx) = {
+ .id = UCLASS_I2C,
+ .name = "i2c_lpc32xx",
+ .probe = lpc32xx_i2c_probe,
+ .ops = &lpc32xx_i2c_ops,
+};
+#endif /* CONFIG_DM_I2C */
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