+// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2000
* (C) Copyright 2011 Marvell Inc.
*
- * SPDX-License-Identifier: GPL-2.0+
- *
* Back ported to the 8xx platform (from the 8260 platform) by
*/
-#include <common.h>
+#include <dm.h>
#include <i2c.h>
+#include <log.h>
#include <asm/io.h>
+#include <linux/delay.h>
#include "mv_i2c.h"
/* All transfers are described by this data structure */
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;
};
+#endif
+
+/*
+ * Dummy implementation that can be overwritten by a board
+ * specific function
+ */
+__weak void i2c_clk_enable(void)
+{
+}
/*
* i2c_reset: - reset the host controller
*/
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 */
+ writel(0x0, &base->isar); /* set our slave address */
+ /* 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 ret;
}
-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;
-}
-
-static int __i2c_read(struct mv_i2c *base, uchar chip, uint addr, int alen,
+static int __i2c_read(struct mv_i2c *base, uchar chip, u8 *addr, int alen,
uchar *buffer, int len)
{
struct mv_i2c_msg msg;
- u8 addr_bytes[3]; /* lowest...highest byte of data address */
debug("i2c_read(chip=0x%02x, addr=0x%02x, alen=0x%02x, "
- "len=0x%02x)\n", chip, addr, alen, len);
+ "len=0x%02x)\n", chip, *addr, alen, len);
+
+ if (len == 0) {
+ printf("reading zero byte is invalid\n");
+ return -EINVAL;
+ }
i2c_reset(base);
* 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) {
- debug("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];
+ msg.data = addr[alen];
if (i2c_transfer(base, &msg))
return -1;
}
return -1;
*buffer = msg.data;
- debug("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++;
}
return 0;
}
-static int __i2c_write(struct mv_i2c *base, uchar chip, uint addr, int alen,
+static int __i2c_write(struct mv_i2c *base, uchar chip, u8 *addr, int alen,
uchar *buffer, int len)
{
struct mv_i2c_msg msg;
- u8 addr_bytes[3]; /* lowest...highest byte of data address */
debug("i2c_write(chip=0x%02x, addr=0x%02x, alen=0x%02x, "
- "len=0x%02x)\n", chip, addr, alen, len);
+ "len=0x%02x)\n", chip, *addr, alen, len);
i2c_reset(base);
* 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) {
- debug("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];
+ msg.data = addr[alen];
if (i2c_transfer(base, &msg))
return -1;
}
/* write bytes; send NACK at last byte */
while (len--) {
- debug("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;
return 0;
}
+#if !CONFIG_IS_ENABLED(DM_I2C)
+
static struct mv_i2c *base_glob;
-static void i2c_board_init(struct mv_i2c *base)
+/* API Functions */
+void i2c_init(int speed, int slaveaddr)
{
-#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);
+ u32 val;
- i2c_init_board();
+ base_glob = (struct mv_i2c *)CONFIG_MV_I2C_REG;
- writel(icr, &base->icr);
-#endif
+ if (speed > I2C_SPEED_STANDARD_RATE)
+ val = ICR_FM;
+ else
+ val = ICR_SM;
+ clrsetbits_le32(&base_glob->icr, ICR_MODE_MASK, val);
}
-#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)
+static int __i2c_probe_chip(struct mv_i2c *base, uchar chip)
{
- 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;
- }
+ struct mv_i2c_msg msg;
- return 0;
-}
+ i2c_reset(base);
-unsigned int i2c_get_bus_num(void)
-{
- return current_bus;
-}
-#endif
+ 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;
-/* API Functions */
-void i2c_init(int speed, int slaveaddr)
-{
-#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
+ msg.condition = I2C_COND_STOP;
+ msg.acknack = I2C_ACKNAK_SENDNAK;
+ msg.direction = I2C_READ;
+ msg.data = 0x00;
+ if (i2c_transfer(base, &msg))
+ return -1;
- i2c_board_init(base_glob);
+ return 0;
}
/*
*/
int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
{
- return __i2c_read(base_glob, chip, addr, alen, buffer, 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);
}
/*
*/
int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
{
- return __i2c_write(base_glob, chip, addr, alen, buffer, 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 = dev_read_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 = sizeof(struct mv_i2c_priv),
+ .ops = &mv_i2c_ops,
+};
+#endif /* CONFIG_DM_I2C */
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