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-rw-r--r--drivers/i2c/mv_i2c.c267
1 files changed, 141 insertions, 126 deletions
diff --git a/drivers/i2c/mv_i2c.c b/drivers/i2c/mv_i2c.c
index 36482d5af3a..30b986e705a 100644
--- a/drivers/i2c/mv_i2c.c
+++ b/drivers/i2c/mv_i2c.c
@@ -18,9 +18,8 @@
*/
#include <common.h>
-#include <asm/io.h>
-
#include <i2c.h>
+#include <asm/io.h>
#include "mv_i2c.h"
/* All transfers are described by this data structure */
@@ -43,62 +42,11 @@ struct mv_i2c {
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 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 = (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)
-{
- return current_bus;
-}
-#endif
-
/*
* i2c_reset: - reset the host controller
*
*/
-static void i2c_reset(void)
+static void i2c_reset(struct mv_i2c *base)
{
writel(readl(&base->icr) & ~ICR_IUE, &base->icr); /* disable unit */
writel(readl(&base->icr) | ICR_UR, &base->icr); /* reset the unit */
@@ -120,7 +68,7 @@ static void i2c_reset(void)
*
* @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;
@@ -150,7 +98,7 @@ static int i2c_isr_set_cleared(unsigned long set_mask,
* -5: illegal parameters
* -6: bus is busy and couldn't be aquired
*/
-int i2c_transfer(struct mv_i2c_msg *msg)
+static int i2c_transfer(struct mv_i2c *base, struct mv_i2c_msg *msg)
{
int ret;
@@ -160,7 +108,7 @@ int i2c_transfer(struct mv_i2c_msg *msg)
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 */
@@ -179,7 +127,7 @@ int i2c_transfer(struct mv_i2c_msg *msg)
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 */
@@ -187,14 +135,14 @@ int i2c_transfer(struct mv_i2c_msg *msg)
/* 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 */
@@ -212,7 +160,7 @@ int i2c_transfer(struct mv_i2c_msg *msg)
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);
@@ -258,68 +206,35 @@ transfer_error_bus_busy:
i2c_transfer_finish:
debug("i2c_transfer: ISR: 0x%04x\n", readl(&base->isr));
- i2c_reset();
+ i2c_reset(base);
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);
-}
-
-/*
- * 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_probe_chip(struct mv_i2c *base, uchar chip)
{
struct mv_i2c_msg msg;
- i2c_reset();
+ 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(&msg))
+ 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(&msg))
+ if (i2c_transfer(base, &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)
+static int __i2c_read(struct mv_i2c *base, uchar chip, uint addr, int alen,
+ uchar *buffer, int len)
{
struct mv_i2c_msg msg;
u8 addr_bytes[3]; /* lowest...highest byte of data address */
@@ -327,7 +242,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
debug("i2c_read(chip=0x%02x, addr=0x%02x, alen=0x%02x, "
"len=0x%02x)\n", chip, addr, alen, len);
- i2c_reset();
+ i2c_reset(base);
/* dummy chip address write */
debug("i2c_read: dummy chip address write\n");
@@ -336,7 +251,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
msg.direction = I2C_WRITE;
msg.data = (chip << 1);
msg.data &= 0xFE;
- if (i2c_transfer(&msg))
+ if (i2c_transfer(base, &msg))
return -1;
/*
@@ -354,7 +269,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
msg.acknack = I2C_ACKNAK_WAITACK;
msg.direction = I2C_WRITE;
msg.data = addr_bytes[alen];
- if (i2c_transfer(&msg))
+ if (i2c_transfer(base, &msg))
return -1;
}
@@ -365,7 +280,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
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 */
@@ -380,7 +295,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
msg.direction = I2C_READ;
msg.data = 0x00;
- if (i2c_transfer(&msg))
+ if (i2c_transfer(base, &msg))
return -1;
*buffer = msg.data;
@@ -389,25 +304,13 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
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, uint addr, int alen,
+ uchar *buffer, int len)
{
struct mv_i2c_msg msg;
u8 addr_bytes[3]; /* lowest...highest byte of data address */
@@ -415,7 +318,7 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int 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 */
debug("i2c_write: chip address write\n");
@@ -424,7 +327,7 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
msg.direction = I2C_WRITE;
msg.data = (chip << 1);
msg.data &= 0xFE;
- if (i2c_transfer(&msg))
+ if (i2c_transfer(base, &msg))
return -1;
/*
@@ -441,7 +344,7 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
msg.acknack = I2C_ACKNAK_WAITACK;
msg.direction = I2C_WRITE;
msg.data = addr_bytes[alen];
- if (i2c_transfer(&msg))
+ if (i2c_transfer(base, &msg))
return -1;
}
@@ -459,11 +362,123 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
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;
}
+
+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)
+{
+#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
+
+ i2c_board_init(base_glob);
+}
+
+/*
+ * 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)
+{
+ return __i2c_read(base_glob, chip, addr, 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)
+{
+ return __i2c_write(base_glob, chip, addr, alen, buffer, len);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 10:21:16 +0000