+// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2000
* Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
* (C) Copyright 2011 Marvell Inc.
* Lei Wen <leiwen@marvell.com>
*
- * SPDX-License-Identifier: GPL-2.0+
- *
* Back ported to the 8xx platform (from the 8260 platform) by
* Murray.Jensen@cmst.csiro.au, 27-Jan-01.
*/
#include <common.h>
-#include <asm/io.h>
-
-#ifdef CONFIG_HARD_I2C
+#include <dm.h>
#include <i2c.h>
+#include <log.h>
+#include <asm/io.h>
+#include <linux/delay.h>
#include "mv_i2c.h"
-#ifdef DEBUG_I2C
-#define PRINTD(x) printf x
-#else
-#define PRINTD(x)
-#endif
-
/* All transfers are described by this data structure */
-struct i2c_msg {
+struct mv_i2c_msg {
u8 condition;
u8 acknack;
u8 direction;
u8 data;
};
+#ifdef CONFIG_ARMADA_3700
+/* Armada 3700 has no padding between the registers */
+struct mv_i2c {
+ u32 ibmr;
+ u32 idbr;
+ u32 icr;
+ u32 isr;
+ u32 isar;
+};
+#else
struct mv_i2c {
u32 ibmr;
u32 pad0;
u32 pad3;
u32 isar;
};
-
-static struct mv_i2c *base;
-static void i2c_board_init(struct mv_i2c *base)
-{
-#ifdef CONFIG_SYS_I2C_INIT_BOARD
- u32 icr;
- /*
- * 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.
- *
- * disable I2C controller first, otherwhise it thinks we want to
- * talk to the slave port...
- */
- icr = readl(&base->icr);
- writel(readl(&base->icr) & ~(ICR_SCLE | ICR_IUE), &base->icr);
-
- i2c_init_board();
-
- writel(icr, &base->icr);
#endif
-}
-#ifdef CONFIG_I2C_MULTI_BUS
-static u32 i2c_regs[CONFIG_MV_I2C_NUM] = CONFIG_MV_I2C_REG;
-static unsigned int bus_initialized[CONFIG_MV_I2C_NUM];
-static unsigned int current_bus;
-
-int i2c_set_bus_num(unsigned int bus)
-{
- if ((bus < 0) || (bus >= CONFIG_MV_I2C_NUM)) {
- printf("Bad bus: %d\n", bus);
- return -1;
- }
-
- base = (struct mv_i2c *)i2c_regs[bus];
- current_bus = bus;
-
- if (!bus_initialized[current_bus]) {
- i2c_board_init(base);
- bus_initialized[current_bus] = 1;
- }
-
- return 0;
-}
-
-unsigned int i2c_get_bus_num(void)
+/*
+ * Dummy implementation that can be overwritten by a board
+ * specific function
+ */
+__weak void i2c_clk_enable(void)
{
- return current_bus;
}
-#endif
/*
* i2c_reset: - reset the host controller
*
*/
-static void i2c_reset(void)
+static void i2c_reset(struct mv_i2c *base)
{
+ u32 icr_mode;
+
+ /* Save bus mode (standard or fast speed) for later use */
+ icr_mode = readl(&base->icr) & ICR_MODE_MASK;
writel(readl(&base->icr) & ~ICR_IUE, &base->icr); /* disable unit */
writel(readl(&base->icr) | ICR_UR, &base->icr); /* reset the unit */
udelay(100);
i2c_clk_enable();
writel(CONFIG_SYS_I2C_SLAVE, &base->isar); /* set our slave address */
- writel(I2C_ICR_INIT, &base->icr); /* set control reg values */
+ /* set control reg values */
+ writel(I2C_ICR_INIT | icr_mode, &base->icr);
writel(I2C_ISR_INIT, &base->isr); /* set clear interrupt bits */
writel(readl(&base->icr) | ICR_IUE, &base->icr); /* enable unit */
udelay(100);
*
* @return: 1 in case of success, 0 means timeout (no match within 10 ms).
*/
-static int i2c_isr_set_cleared(unsigned long set_mask,
+static int i2c_isr_set_cleared(struct mv_i2c *base, unsigned long set_mask,
unsigned long cleared_mask)
{
int timeout = 1000, isr;
* -5: illegal parameters
* -6: bus is busy and couldn't be aquired
*/
-int i2c_transfer(struct i2c_msg *msg)
+static int i2c_transfer(struct mv_i2c *base, struct mv_i2c_msg *msg)
{
int ret;
switch (msg->direction) {
case I2C_WRITE:
/* check if bus is not busy */
- if (!i2c_isr_set_cleared(0, ISR_IBB))
+ if (!i2c_isr_set_cleared(base, 0, ISR_IBB))
goto transfer_error_bus_busy;
/* start transmission */
writel(readl(&base->icr) | ICR_TB, &base->icr);
/* transmit register empty? */
- if (!i2c_isr_set_cleared(ISR_ITE, 0))
+ if (!i2c_isr_set_cleared(base, ISR_ITE, 0))
goto transfer_error_transmit_timeout;
/* clear 'transmit empty' state */
/* wait for ACK from slave */
if (msg->acknack == I2C_ACKNAK_WAITACK)
- if (!i2c_isr_set_cleared(0, ISR_ACKNAK))
+ if (!i2c_isr_set_cleared(base, 0, ISR_ACKNAK))
goto transfer_error_ack_missing;
break;
case I2C_READ:
/* check if bus is not busy */
- if (!i2c_isr_set_cleared(0, ISR_IBB))
+ if (!i2c_isr_set_cleared(base, 0, ISR_IBB))
goto transfer_error_bus_busy;
/* start receive */
writel(readl(&base->icr) | ICR_TB, &base->icr);
/* receive register full? */
- if (!i2c_isr_set_cleared(ISR_IRF, 0))
+ if (!i2c_isr_set_cleared(base, ISR_IRF, 0))
goto transfer_error_receive_timeout;
msg->data = readl(&base->idbr);
return 0;
transfer_error_msg_empty:
- PRINTD(("i2c_transfer: error: 'msg' is empty\n"));
- ret = -1; goto i2c_transfer_finish;
+ debug("i2c_transfer: error: 'msg' is empty\n");
+ ret = -1;
+ goto i2c_transfer_finish;
transfer_error_transmit_timeout:
- PRINTD(("i2c_transfer: error: transmit timeout\n"));
- ret = -2; goto i2c_transfer_finish;
+ debug("i2c_transfer: error: transmit timeout\n");
+ ret = -2;
+ goto i2c_transfer_finish;
transfer_error_ack_missing:
- PRINTD(("i2c_transfer: error: ACK missing\n"));
- ret = -3; goto i2c_transfer_finish;
+ debug("i2c_transfer: error: ACK missing\n");
+ ret = -3;
+ goto i2c_transfer_finish;
transfer_error_receive_timeout:
- PRINTD(("i2c_transfer: error: receive timeout\n"));
- ret = -4; goto i2c_transfer_finish;
+ debug("i2c_transfer: error: receive timeout\n");
+ ret = -4;
+ goto i2c_transfer_finish;
transfer_error_illegal_param:
- PRINTD(("i2c_transfer: error: illegal parameters\n"));
- ret = -5; goto i2c_transfer_finish;
+ debug("i2c_transfer: error: illegal parameters\n");
+ ret = -5;
+ goto i2c_transfer_finish;
transfer_error_bus_busy:
- PRINTD(("i2c_transfer: error: bus is busy\n"));
- ret = -6; goto i2c_transfer_finish;
+ debug("i2c_transfer: error: bus is busy\n");
+ ret = -6;
+ goto i2c_transfer_finish;
i2c_transfer_finish:
- PRINTD(("i2c_transfer: ISR: 0x%04x\n", readl(&base->isr)));
- i2c_reset();
- return ret;
-}
-
-/* ------------------------------------------------------------------------ */
-/* API Functions */
-/* ------------------------------------------------------------------------ */
-void i2c_init(int speed, int slaveaddr)
-{
-#ifdef CONFIG_I2C_MULTI_BUS
- current_bus = 0;
- base = (struct mv_i2c *)i2c_regs[current_bus];
-#else
- base = (struct mv_i2c *)CONFIG_MV_I2C_REG;
-#endif
-
- i2c_board_init(base);
+ debug("i2c_transfer: ISR: 0x%04x\n", readl(&base->isr));
+ i2c_reset(base);
+ return ret;
}
-/*
- * i2c_probe: - Test if a chip answers for a given i2c address
- *
- * @chip: address of the chip which is searched for
- * @return: 0 if a chip was found, -1 otherwhise
- */
-int i2c_probe(uchar chip)
+static int __i2c_read(struct mv_i2c *base, uchar chip, u8 *addr, int alen,
+ uchar *buffer, int len)
{
- struct i2c_msg msg;
-
- i2c_reset();
+ struct mv_i2c_msg msg;
- msg.condition = I2C_COND_START;
- msg.acknack = I2C_ACKNAK_WAITACK;
- msg.direction = I2C_WRITE;
- msg.data = (chip << 1) + 1;
- if (i2c_transfer(&msg))
- return -1;
+ debug("i2c_read(chip=0x%02x, addr=0x%02x, alen=0x%02x, "
+ "len=0x%02x)\n", chip, *addr, alen, len);
- msg.condition = I2C_COND_STOP;
- msg.acknack = I2C_ACKNAK_SENDNAK;
- msg.direction = I2C_READ;
- msg.data = 0x00;
- if (i2c_transfer(&msg))
- return -1;
-
- return 0;
-}
-
-/*
- * i2c_read: - Read multiple bytes from an i2c device
- *
- * The higher level routines take into account that this function is only
- * called with len < page length of the device (see configuration file)
- *
- * @chip: address of the chip which is to be read
- * @addr: i2c data address within the chip
- * @alen: length of the i2c data address (1..2 bytes)
- * @buffer: where to write the data
- * @len: how much byte do we want to read
- * @return: 0 in case of success
- */
-int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
-{
- struct i2c_msg msg;
- u8 addr_bytes[3]; /* lowest...highest byte of data address */
-
- PRINTD(("i2c_read(chip=0x%02x, addr=0x%02x, alen=0x%02x, "
- "len=0x%02x)\n", chip, addr, alen, len));
+ if (len == 0) {
+ printf("reading zero byte is invalid\n");
+ return -EINVAL;
+ }
- i2c_reset();
+ i2c_reset(base);
/* dummy chip address write */
- PRINTD(("i2c_read: dummy chip address write\n"));
+ debug("i2c_read: dummy chip address write\n");
msg.condition = I2C_COND_START;
msg.acknack = I2C_ACKNAK_WAITACK;
msg.direction = I2C_WRITE;
msg.data = (chip << 1);
msg.data &= 0xFE;
- if (i2c_transfer(&msg))
+ if (i2c_transfer(base, &msg))
return -1;
/*
* send memory address bytes;
* alen defines how much bytes we have to send.
*/
- /*addr &= ((1 << CONFIG_SYS_EEPROM_PAGE_WRITE_BITS)-1); */
- addr_bytes[0] = (u8)((addr >> 0) & 0x000000FF);
- addr_bytes[1] = (u8)((addr >> 8) & 0x000000FF);
- addr_bytes[2] = (u8)((addr >> 16) & 0x000000FF);
-
while (--alen >= 0) {
- PRINTD(("i2c_read: send memory word address byte %1d\n", alen));
+ debug("i2c_read: send address byte %02x (alen=%d)\n",
+ *addr, alen);
msg.condition = I2C_COND_NORMAL;
msg.acknack = I2C_ACKNAK_WAITACK;
msg.direction = I2C_WRITE;
- msg.data = addr_bytes[alen];
- if (i2c_transfer(&msg))
+ msg.data = addr[alen];
+ if (i2c_transfer(base, &msg))
return -1;
}
/* start read sequence */
- PRINTD(("i2c_read: start read sequence\n"));
+ debug("i2c_read: start read sequence\n");
msg.condition = I2C_COND_START;
msg.acknack = I2C_ACKNAK_WAITACK;
msg.direction = I2C_WRITE;
msg.data = (chip << 1);
msg.data |= 0x01;
- if (i2c_transfer(&msg))
+ if (i2c_transfer(base, &msg))
return -1;
/* read bytes; send NACK at last byte */
msg.direction = I2C_READ;
msg.data = 0x00;
- if (i2c_transfer(&msg))
+ if (i2c_transfer(base, &msg))
return -1;
*buffer = msg.data;
- PRINTD(("i2c_read: reading byte (0x%08x)=0x%02x\n",
- (unsigned int)buffer, *buffer));
+ debug("i2c_read: reading byte (%p)=0x%02x\n",
+ buffer, *buffer);
buffer++;
}
- i2c_reset();
+ i2c_reset(base);
return 0;
}
-/*
- * i2c_write: - Write multiple bytes to an i2c device
- *
- * The higher level routines take into account that this function is only
- * called with len < page length of the device (see configuration file)
- *
- * @chip: address of the chip which is to be written
- * @addr: i2c data address within the chip
- * @alen: length of the i2c data address (1..2 bytes)
- * @buffer: where to find the data to be written
- * @len: how much byte do we want to read
- * @return: 0 in case of success
- */
-int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
+static int __i2c_write(struct mv_i2c *base, uchar chip, u8 *addr, int alen,
+ uchar *buffer, int len)
{
- struct i2c_msg msg;
- u8 addr_bytes[3]; /* lowest...highest byte of data address */
+ struct mv_i2c_msg msg;
- PRINTD(("i2c_write(chip=0x%02x, addr=0x%02x, alen=0x%02x, "
- "len=0x%02x)\n", chip, addr, alen, len));
+ debug("i2c_write(chip=0x%02x, addr=0x%02x, alen=0x%02x, "
+ "len=0x%02x)\n", chip, *addr, alen, len);
- i2c_reset();
+ i2c_reset(base);
/* chip address write */
- PRINTD(("i2c_write: chip address write\n"));
+ debug("i2c_write: chip address write\n");
msg.condition = I2C_COND_START;
msg.acknack = I2C_ACKNAK_WAITACK;
msg.direction = I2C_WRITE;
msg.data = (chip << 1);
msg.data &= 0xFE;
- if (i2c_transfer(&msg))
+ if (i2c_transfer(base, &msg))
return -1;
/*
* send memory address bytes;
* alen defines how much bytes we have to send.
*/
- addr_bytes[0] = (u8)((addr >> 0) & 0x000000FF);
- addr_bytes[1] = (u8)((addr >> 8) & 0x000000FF);
- addr_bytes[2] = (u8)((addr >> 16) & 0x000000FF);
-
while (--alen >= 0) {
- PRINTD(("i2c_write: send memory word address\n"));
+ debug("i2c_read: send address byte %02x (alen=%d)\n",
+ *addr, alen);
msg.condition = I2C_COND_NORMAL;
msg.acknack = I2C_ACKNAK_WAITACK;
msg.direction = I2C_WRITE;
- msg.data = addr_bytes[alen];
- if (i2c_transfer(&msg))
+ msg.data = addr[alen];
+ if (i2c_transfer(base, &msg))
return -1;
}
/* write bytes; send NACK at last byte */
while (len--) {
- PRINTD(("i2c_write: writing byte (0x%08x)=0x%02x\n",
- (unsigned int)buffer, *buffer));
+ debug("i2c_write: writing byte (%p)=0x%02x\n",
+ buffer, *buffer);
if (len == 0)
msg.condition = I2C_COND_STOP;
msg.direction = I2C_WRITE;
msg.data = *(buffer++);
- if (i2c_transfer(&msg))
+ if (i2c_transfer(base, &msg))
return -1;
}
- i2c_reset();
+ i2c_reset(base);
return 0;
}
-#endif /* CONFIG_HARD_I2C */
+
+#ifndef CONFIG_DM_I2C
+
+static struct mv_i2c *base_glob;
+
+static void i2c_board_init(struct mv_i2c *base)
+{
+#ifdef CONFIG_SYS_I2C_INIT_BOARD
+ u32 icr;
+ /*
+ * 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.
+ *
+ * disable I2C controller first, otherwhise it thinks we want to
+ * talk to the slave port...
+ */
+ icr = readl(&base->icr);
+ writel(readl(&base->icr) & ~(ICR_SCLE | ICR_IUE), &base->icr);
+
+ i2c_init_board();
+
+ writel(icr, &base->icr);
+#endif
+}
+
+#ifdef CONFIG_I2C_MULTI_BUS
+static unsigned long i2c_regs[CONFIG_MV_I2C_NUM] = CONFIG_MV_I2C_REG;
+static unsigned int bus_initialized[CONFIG_MV_I2C_NUM];
+static unsigned int current_bus;
+
+int i2c_set_bus_num(unsigned int bus)
+{
+ if ((bus < 0) || (bus >= CONFIG_MV_I2C_NUM)) {
+ printf("Bad bus: %d\n", bus);
+ return -1;
+ }
+
+ base_glob = (struct mv_i2c *)i2c_regs[bus];
+ current_bus = bus;
+
+ if (!bus_initialized[current_bus]) {
+ i2c_board_init(base_glob);
+ bus_initialized[current_bus] = 1;
+ }
+
+ return 0;
+}
+
+unsigned int i2c_get_bus_num(void)
+{
+ return current_bus;
+}
+#endif
+
+/* API Functions */
+void i2c_init(int speed, int slaveaddr)
+{
+ u32 val;
+
+#ifdef CONFIG_I2C_MULTI_BUS
+ current_bus = 0;
+ base_glob = (struct mv_i2c *)i2c_regs[current_bus];
+#else
+ base_glob = (struct mv_i2c *)CONFIG_MV_I2C_REG;
+#endif
+
+ if (speed > I2C_SPEED_STANDARD_RATE)
+ val = ICR_FM;
+ else
+ val = ICR_SM;
+ clrsetbits_le32(&base_glob->icr, ICR_MODE_MASK, val);
+
+ i2c_board_init(base_glob);
+}
+
+static int __i2c_probe_chip(struct mv_i2c *base, uchar chip)
+{
+ struct mv_i2c_msg msg;
+
+ i2c_reset(base);
+
+ msg.condition = I2C_COND_START;
+ msg.acknack = I2C_ACKNAK_WAITACK;
+ msg.direction = I2C_WRITE;
+ msg.data = (chip << 1) + 1;
+ if (i2c_transfer(base, &msg))
+ return -1;
+
+ msg.condition = I2C_COND_STOP;
+ msg.acknack = I2C_ACKNAK_SENDNAK;
+ msg.direction = I2C_READ;
+ msg.data = 0x00;
+ if (i2c_transfer(base, &msg))
+ return -1;
+
+ return 0;
+}
+
+/*
+ * i2c_probe: - Test if a chip answers for a given i2c address
+ *
+ * @chip: address of the chip which is searched for
+ * @return: 0 if a chip was found, -1 otherwhise
+ */
+int i2c_probe(uchar chip)
+{
+ return __i2c_probe_chip(base_glob, chip);
+}
+
+/*
+ * i2c_read: - Read multiple bytes from an i2c device
+ *
+ * The higher level routines take into account that this function is only
+ * called with len < page length of the device (see configuration file)
+ *
+ * @chip: address of the chip which is to be read
+ * @addr: i2c data address within the chip
+ * @alen: length of the i2c data address (1..2 bytes)
+ * @buffer: where to write the data
+ * @len: how much byte do we want to read
+ * @return: 0 in case of success
+ */
+int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
+{
+ u8 addr_bytes[4];
+
+ addr_bytes[0] = (addr >> 0) & 0xFF;
+ addr_bytes[1] = (addr >> 8) & 0xFF;
+ addr_bytes[2] = (addr >> 16) & 0xFF;
+ addr_bytes[3] = (addr >> 24) & 0xFF;
+
+ return __i2c_read(base_glob, chip, addr_bytes, alen, buffer, len);
+}
+
+/*
+ * i2c_write: - Write multiple bytes to an i2c device
+ *
+ * The higher level routines take into account that this function is only
+ * called with len < page length of the device (see configuration file)
+ *
+ * @chip: address of the chip which is to be written
+ * @addr: i2c data address within the chip
+ * @alen: length of the i2c data address (1..2 bytes)
+ * @buffer: where to find the data to be written
+ * @len: how much byte do we want to read
+ * @return: 0 in case of success
+ */
+int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
+{
+ u8 addr_bytes[4];
+
+ addr_bytes[0] = (addr >> 0) & 0xFF;
+ addr_bytes[1] = (addr >> 8) & 0xFF;
+ addr_bytes[2] = (addr >> 16) & 0xFF;
+ addr_bytes[3] = (addr >> 24) & 0xFF;
+
+ return __i2c_write(base_glob, chip, addr_bytes, alen, buffer, len);
+}
+
+#else /* CONFIG_DM_I2C */
+
+struct mv_i2c_priv {
+ struct mv_i2c *base;
+};
+
+static int mv_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs)
+{
+ struct mv_i2c_priv *i2c = dev_get_priv(bus);
+ struct i2c_msg *dmsg, *omsg, dummy;
+
+ 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 or offset/data combined)
+ */
+ 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;
+
+ if (dmsg->flags & I2C_M_RD)
+ return __i2c_read(i2c->base, dmsg->addr, omsg->buf,
+ omsg->len, dmsg->buf, dmsg->len);
+ else
+ return __i2c_write(i2c->base, dmsg->addr, omsg->buf,
+ omsg->len, dmsg->buf, dmsg->len);
+}
+
+static int mv_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
+{
+ struct mv_i2c_priv *priv = dev_get_priv(bus);
+ u32 val;
+
+ if (speed > I2C_SPEED_STANDARD_RATE)
+ val = ICR_FM;
+ else
+ val = ICR_SM;
+ clrsetbits_le32(&priv->base->icr, ICR_MODE_MASK, val);
+
+ return 0;
+}
+
+static int mv_i2c_probe(struct udevice *bus)
+{
+ struct mv_i2c_priv *priv = dev_get_priv(bus);
+
+ priv->base = (void *)devfdt_get_addr_ptr(bus);
+
+ return 0;
+}
+
+static const struct dm_i2c_ops mv_i2c_ops = {
+ .xfer = mv_i2c_xfer,
+ .set_bus_speed = mv_i2c_set_bus_speed,
+};
+
+static const struct udevice_id mv_i2c_ids[] = {
+ { .compatible = "marvell,armada-3700-i2c" },
+ { }
+};
+
+U_BOOT_DRIVER(i2c_mv) = {
+ .name = "i2c_mv",
+ .id = UCLASS_I2C,
+ .of_match = mv_i2c_ids,
+ .probe = mv_i2c_probe,
+ .priv_auto_alloc_size = sizeof(struct mv_i2c_priv),
+ .ops = &mv_i2c_ops,
+};
+#endif /* CONFIG_DM_I2C */
projects / oweals / u-boot.git / blobdiff