[U-Boot] [U-Boot PATCH v2 07/12] i2c, davinci: add support for multiple i2c buses

Murali Karicheri
2014-02-20T17:55:09Z

From: Vitaly Andrianov <vitalya@ti.com>

Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
---
drivers/i2c/davinci_i2c.c | 344 ++++++++++++++++++++++++++-------------------
drivers/i2c/davinci_i2c.h | 27 ++--
2 files changed, 218 insertions(+), 153 deletions(-)

diff --git a/drivers/i2c/davinci_i2c.c b/drivers/i2c/davinci_i2c.c
index 6e5260c..c584a11 100644
--- a/drivers/i2c/davinci_i2c.c
+++ b/drivers/i2c/davinci_i2c.c
@@ -1,25 +1,37 @@
/*
* TI DaVinci (TMS320DM644x) I2C driver.
*
- * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
+ * (C) Copyright 2012-2014
+ * Texas Instruments Incorporated, <www.ti.com>
+ * (C) Copyright 2007 Sergey Kubushyn <ksi@koi8.net>
*
- * --------------------------------------------------------
- *
- * SPDX-License-Identifier: GPL-2.0+
+ * SPDX-License-Identifier: GPL-2.0+
*/

#include <common.h>
#include <i2c.h>
#include <asm/arch/hardware.h>
#include <asm/arch/i2c_defs.h>
+#include <asm/io.h>
#include "davinci_i2c.h"

+DECLARE_GLOBAL_DATA_PTR;
+
+static struct i2c_regs __attribute__((section(".data"))) *i2c_base =
+ (struct i2c_regs *)I2C_BASE;
+
+#ifdef CONFIG_I2C_MULTI_BUS
+static unsigned int __attribute__((section(".data")))
+ bus_initialized[I2C_BUS_MAX] = { [0 ... (I2C_BUS_MAX-1)] = 0 };
+static unsigned int __attribute__((section(".data"))) current_bus;
+#endif
+
#define CHECK_NACK() \
do {\
if (tmp & (I2C_TIMEOUT | I2C_STAT_NACK)) {\
- REG(I2C_CON) = 0;\
- return(1);\
- }\
+ REG(&(i2c_base->i2c_con)) = 0;\
+ return 1;\
+ } \
} while (0)

@@ -27,20 +39,21 @@ static int wait_for_bus(void)
{
int stat, timeout;

- REG(I2C_STAT) = 0xffff;
+ REG(&(i2c_base->i2c_stat)) = 0xffff;

for (timeout = 0; timeout < 10; timeout++) {
- if (!((stat = REG(I2C_STAT)) & I2C_STAT_BB)) {
- REG(I2C_STAT) = 0xffff;
- return(0);
+ stat = REG(&(i2c_base->i2c_stat));
+ if (!((stat) & I2C_STAT_BB)) {
+ REG(&(i2c_base->i2c_stat)) = 0xffff;
+ return 0;
}

- REG(I2C_STAT) = stat;
+ REG(&(i2c_base->i2c_stat)) = stat;
udelay(50000);
}

- REG(I2C_STAT) = 0xffff;
- return(1);
+ REG(&(i2c_base->i2c_stat)) = 0xffff;
+ return 1;
}

@@ -50,25 +63,24 @@ static int poll_i2c_irq(int mask)

for (timeout = 0; timeout < 10; timeout++) {
udelay(1000);
- stat = REG(I2C_STAT);
- if (stat & mask) {
- return(stat);
- }
+ stat = REG(&(i2c_base->i2c_stat));
+ if (stat & mask)
+ return stat;
}

- REG(I2C_STAT) = 0xffff;
- return(stat | I2C_TIMEOUT);
+ REG(&(i2c_base->i2c_stat)) = 0xffff;
+ return stat | I2C_TIMEOUT;
}

void flush_rx(void)
{
while (1) {
- if (!(REG(I2C_STAT) & I2C_STAT_RRDY))
+ if (!(REG(&(i2c_base->i2c_stat)) & I2C_STAT_RRDY))
break;

- REG(I2C_DRR);
- REG(I2C_STAT) = I2C_STAT_RRDY;
+ REG(&(i2c_base->i2c_drr));
+ REG(&(i2c_base->i2c_stat)) = I2C_STAT_RRDY;
udelay(1000);
}
}
@@ -78,28 +90,33 @@ void i2c_init(int speed, int slaveadd)
{
u_int32_t div, psc;

- if (REG(I2C_CON) & I2C_CON_EN) {
- REG(I2C_CON) = 0;
- udelay (50000);
+ if (REG(&(i2c_base->i2c_con)) & I2C_CON_EN) {
+ REG(&(i2c_base->i2c_con)) = 0;
+ udelay(50000);
}

psc = 2;
- div = (CONFIG_SYS_HZ_CLOCK / ((psc + 1) * speed)) - 10; /* SCLL + SCLH */
- REG(I2C_PSC) = psc; /* 27MHz / (2 + 1) = 9MHz */
- REG(I2C_SCLL) = (div * 50) / 100; /* 50% Duty */
- REG(I2C_SCLH) = div - REG(I2C_SCLL);
+ div = (CONFIG_SYS_HZ_CLOCK / ((psc + 1) * speed)) - 10;
+ REG(&(i2c_base->i2c_psc)) = psc;
+ REG(&(i2c_base->i2c_scll)) = (div * 50) / 100;
+ REG(&(i2c_base->i2c_sclh)) = div - REG(&(i2c_base->i2c_scll));

- REG(I2C_OA) = slaveadd;
- REG(I2C_CNT) = 0;
+ REG(&(i2c_base->i2c_oa)) = slaveadd;
+ REG(&(i2c_base->i2c_cnt)) = 0;

/* Interrupts must be enabled or I2C module won't work */
- REG(I2C_IE) = I2C_IE_SCD_IE | I2C_IE_XRDY_IE |
+ REG(&(i2c_base->i2c_ie)) = I2C_IE_SCD_IE | I2C_IE_XRDY_IE |
I2C_IE_RRDY_IE | I2C_IE_ARDY_IE | I2C_IE_NACK_IE;

/* Now enable I2C controller (get it out of reset) */
- REG(I2C_CON) = I2C_CON_EN;
+ REG(&(i2c_base->i2c_con)) = I2C_CON_EN;

udelay(1000);
+
+#ifdef CONFIG_I2C_MULTI_BUS
+ if (gd->flags & GD_FLG_RELOC)
+ bus_initialized[current_bus] = 1;
+#endif
}

int i2c_set_bus_speed(unsigned int speed)
@@ -112,34 +129,36 @@ int i2c_probe(u_int8_t chip)
{
int rc = 1;

- if (chip == REG(I2C_OA)) {
- return(rc);
- }
+ if (chip == REG(&(i2c_base->i2c_oa)))
+ return rc;

- REG(I2C_CON) = 0;
- if (wait_for_bus()) {return(1);}
+ REG(&(i2c_base->i2c_con)) = 0;
+ if (wait_for_bus())
+ return 1;

/* try to read one byte from current (or only) address */
- REG(I2C_CNT) = 1;
- REG(I2C_SA) = chip;
- REG(I2C_CON) = (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP);
- udelay (50000);
+ REG(&(i2c_base->i2c_cnt)) = 1;
+ REG(&(i2c_base->i2c_sa)) = chip;
+ REG(&(i2c_base->i2c_con)) = (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT |
+ I2C_CON_STP);
+ udelay(50000);

- if (!(REG(I2C_STAT) & I2C_STAT_NACK)) {
+ if (!(REG(&(i2c_base->i2c_stat)) & I2C_STAT_NACK)) {
rc = 0;
flush_rx();
- REG(I2C_STAT) = 0xffff;
+ REG(&(i2c_base->i2c_stat)) = 0xffff;
} else {
- REG(I2C_STAT) = 0xffff;
- REG(I2C_CON) |= I2C_CON_STP;
+ REG(&(i2c_base->i2c_stat)) = 0xffff;
+ REG(&(i2c_base->i2c_con)) |= I2C_CON_STP;
udelay(20000);
- if (wait_for_bus()) {return(1);}
+ if (wait_for_bus())
+ return 1;
}

flush_rx();
- REG(I2C_STAT) = 0xffff;
- REG(I2C_CNT) = 0;
- return(rc);
+ REG(&(i2c_base->i2c_stat)) = 0xffff;
+ REG(&(i2c_base->i2c_cnt)) = 0;
+ return rc;
}

@@ -149,73 +168,76 @@ int i2c_read(u_int8_t chip, u_int32_t addr, int alen, u_int8_t *buf, int len)
int i;

if ((alen < 0) || (alen > 2)) {
- printf("%s(): bogus address length %x\n", __FUNCTION__, alen);
- return(1);
+ printf("%s(): bogus address length %x\n", __func__, alen);
+ return 1;
}

- if (wait_for_bus()) {return(1);}
+ if (wait_for_bus())
+ return 1;

if (alen != 0) {
/* Start address phase */
tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX;
- REG(I2C_CNT) = alen;
- REG(I2C_SA) = chip;
- REG(I2C_CON) = tmp;
+ REG(&(i2c_base->i2c_cnt)) = alen;
+ REG(&(i2c_base->i2c_sa)) = chip;
+ REG(&(i2c_base->i2c_con)) = tmp;

tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK);

CHECK_NACK();

switch (alen) {
- case 2:
- /* Send address MSByte */
- if (tmp & I2C_STAT_XRDY) {
- REG(I2C_DXR) = (addr >> 8) & 0xff;
- } else {
- REG(I2C_CON) = 0;
- return(1);
- }
-
- tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK);
-
- CHECK_NACK();
- /* No break, fall through */
- case 1:
- /* Send address LSByte */
- if (tmp & I2C_STAT_XRDY) {
- REG(I2C_DXR) = addr & 0xff;
- } else {
- REG(I2C_CON) = 0;
- return(1);
- }
-
- tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK | I2C_STAT_ARDY);
-
- CHECK_NACK();
-
- if (!(tmp & I2C_STAT_ARDY)) {
- REG(I2C_CON) = 0;
- return(1);
- }
+ case 2:
+ /* Send address MSByte */
+ if (tmp & I2C_STAT_XRDY) {
+ REG(&(i2c_base->i2c_dxr)) = (addr >> 8) & 0xff;
+ } else {
+ REG(&(i2c_base->i2c_con)) = 0;
+ return 1;
+ }
+
+ tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK);
+
+ CHECK_NACK();
+ /* No break, fall through */
+ case 1:
+ /* Send address LSByte */
+ if (tmp & I2C_STAT_XRDY) {
+ REG(&(i2c_base->i2c_dxr)) = addr & 0xff;
+ } else {
+ REG(&(i2c_base->i2c_con)) = 0;
+ return 1;
+ }
+
+ tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK |
+ I2C_STAT_ARDY);
+
+ CHECK_NACK();
+
+ if (!(tmp & I2C_STAT_ARDY)) {
+ REG(&(i2c_base->i2c_con)) = 0;
+ return 1;
+ }
}
}

/* Address phase is over, now read 'len' bytes and stop */
tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP;
- REG(I2C_CNT) = len & 0xffff;
- REG(I2C_SA) = chip;
- REG(I2C_CON) = tmp;
+ REG(&(i2c_base->i2c_cnt)) = len & 0xffff;
+ REG(&(i2c_base->i2c_sa)) = chip;
+ REG(&(i2c_base->i2c_con)) = tmp;

for (i = 0; i < len; i++) {
- tmp = poll_i2c_irq(I2C_STAT_RRDY | I2C_STAT_NACK | I2C_STAT_ROVR);
+ tmp = poll_i2c_irq(I2C_STAT_RRDY | I2C_STAT_NACK |
+ I2C_STAT_ROVR);

CHECK_NACK();

if (tmp & I2C_STAT_RRDY) {
- buf[i] = REG(I2C_DRR);
+ buf[i] = REG(&(i2c_base->i2c_drr));
} else {
- REG(I2C_CON) = 0;
- return(1);
+ REG(&(i2c_base->i2c_con)) = 0;
+ return 1;
}
}

@@ -224,16 +246,16 @@ int i2c_read(u_int8_t chip, u_int32_t addr, int alen, u_int8_t *buf, int len)
CHECK_NACK();

if (!(tmp & I2C_STAT_SCD)) {
- REG(I2C_CON) = 0;
- return(1);
+ REG(&(i2c_base->i2c_con)) = 0;
+ return 1;
}

flush_rx();
- REG(I2C_STAT) = 0xffff;
- REG(I2C_CNT) = 0;
- REG(I2C_CON) = 0;
+ REG(&(i2c_base->i2c_stat)) = 0xffff;
+ REG(&(i2c_base->i2c_cnt)) = 0;
+ REG(&(i2c_base->i2c_con)) = 0;

- return(0);
+ return 0;
}

@@ -243,48 +265,51 @@ int i2c_write(u_int8_t chip, u_int32_t addr, int alen, u_int8_t *buf, int len)
int i;

if ((alen < 0) || (alen > 2)) {
- printf("%s(): bogus address length %x\n", __FUNCTION__, alen);
- return(1);
+ printf("%s(): bogus address length %x\n", __func__, alen);
+ return 1;
}
if (len < 0) {
- printf("%s(): bogus length %x\n", __FUNCTION__, len);
- return(1);
+ printf("%s(): bogus length %x\n", __func__, len);
+ return 1;
}

- if (wait_for_bus()) {return(1);}
+ if (wait_for_bus())
+ return 1;

/* Start address phase */
- tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX | I2C_CON_STP;
- REG(I2C_CNT) = (alen == 0) ? len & 0xffff : (len & 0xffff) + alen;
- REG(I2C_SA) = chip;
- REG(I2C_CON) = tmp;
+ tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT |
+ I2C_CON_TRX | I2C_CON_STP;
+ REG(&(i2c_base->i2c_cnt)) = (alen == 0) ?
+ len & 0xffff : (len & 0xffff) + alen;
+ REG(&(i2c_base->i2c_sa)) = chip;
+ REG(&(i2c_base->i2c_con)) = tmp;

switch (alen) {
- case 2:
- /* Send address MSByte */
- tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK);
+ case 2:
+ /* Send address MSByte */
+ tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK);

- CHECK_NACK();
+ CHECK_NACK();

- if (tmp & I2C_STAT_XRDY) {
- REG(I2C_DXR) = (addr >> 8) & 0xff;
- } else {
- REG(I2C_CON) = 0;
- return(1);
- }
- /* No break, fall through */
- case 1:
- /* Send address LSByte */
- tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK);
+ if (tmp & I2C_STAT_XRDY) {
+ REG(&(i2c_base->i2c_dxr)) = (addr >> 8) & 0xff;
+ } else {
+ REG(&(i2c_base->i2c_con)) = 0;
+ return 1;
+ }
+ /* No break, fall through */
+ case 1:
+ /* Send address LSByte */
+ tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK);

- CHECK_NACK();
+ CHECK_NACK();

- if (tmp & I2C_STAT_XRDY) {
- REG(I2C_DXR) = addr & 0xff;
- } else {
- REG(I2C_CON) = 0;
- return(1);
- }
+ if (tmp & I2C_STAT_XRDY) {
+ REG(&(i2c_base->i2c_dxr)) = addr & 0xff;
+ } else {
+ REG(&(i2c_base->i2c_con)) = 0;
+ return 1;
+ }
}

for (i = 0; i < len; i++) {
@@ -292,11 +317,10 @@ int i2c_write(u_int8_t chip, u_int32_t addr, int alen, u_int8_t *buf, int len)

CHECK_NACK();

- if (tmp & I2C_STAT_XRDY) {
- REG(I2C_DXR) = buf[i];
- } else {
- return(1);
- }
+ if (tmp & I2C_STAT_XRDY)
+ REG(&(i2c_base->i2c_dxr)) = buf[i];
+ else
+ return 1;
}

tmp = poll_i2c_irq(I2C_STAT_SCD | I2C_STAT_NACK);
@@ -304,14 +328,52 @@ int i2c_write(u_int8_t chip, u_int32_t addr, int alen, u_int8_t *buf, int len)
CHECK_NACK();

if (!(tmp & I2C_STAT_SCD)) {
- REG(I2C_CON) = 0;
- return(1);
+ REG(&(i2c_base->i2c_con)) = 0;
+ return 1;
}

flush_rx();
- REG(I2C_STAT) = 0xffff;
- REG(I2C_CNT) = 0;
- REG(I2C_CON) = 0;
+ REG(&(i2c_base->i2c_stat)) = 0xffff;
+ REG(&(i2c_base->i2c_cnt)) = 0;
+ REG(&(i2c_base->i2c_con)) = 0;
+
+ return 0;
+}
+
+#ifdef CONFIG_I2C_MULTI_BUS
+int i2c_set_bus_num(unsigned int bus)
+{
+ if ((bus < 0) || (bus >= I2C_BUS_MAX)) {
+ printf("Bad bus: %d\n", bus);
+ return -1;
+ }

- return(0);
+ switch (bus) {
+#if I2C_BUS_MAX == 3
+ case 2:
+ i2c_base = (struct i2c_regs *)I2C2_BASE;
+ break;
+#endif
+#if I2C_BUS_MAX >= 2
+ case 1:
+ i2c_base = (struct i2c_regs *)I2C1_BASE;
+ break;
+#endif
+ default:
+ i2c_base = (struct i2c_regs *)I2C0_BASE;
+ bus = 0;
+ }
+
+ current_bus = bus;
+
+ if (!bus_initialized[current_bus])
+ i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+
+ return 0;
+}
+
+unsigned int i2c_get_bus_num(void)
+{
+ return (int) current_bus;
}
+#endif
diff --git a/drivers/i2c/davinci_i2c.h b/drivers/i2c/davinci_i2c.h
index 79ff7a3..20d4342 100644
--- a/drivers/i2c/davinci_i2c.h
+++ b/drivers/i2c/davinci_i2c.h
@@ -12,18 +12,21 @@
#define I2C_WRITE 0
#define I2C_READ 1

-#define I2C_OA (I2C_BASE + 0x00)
-#define I2C_IE (I2C_BASE + 0x04)
-#define I2C_STAT (I2C_BASE + 0x08)
-#define I2C_SCLL (I2C_BASE + 0x0c)
-#define I2C_SCLH (I2C_BASE + 0x10)
-#define I2C_CNT (I2C_BASE + 0x14)
-#define I2C_DRR (I2C_BASE + 0x18)
-#define I2C_SA (I2C_BASE + 0x1c)
-#define I2C_DXR (I2C_BASE + 0x20)
-#define I2C_CON (I2C_BASE + 0x24)
-#define I2C_IV (I2C_BASE + 0x28)
-#define I2C_PSC (I2C_BASE + 0x30)
+struct i2c_regs {
+ u32 i2c_oa;
+ u32 i2c_ie;
+ u32 i2c_stat;
+ u32 i2c_scll;
+ u32 i2c_sclh;
+ u32 i2c_cnt;
+ u32 i2c_drr;
+ u32 i2c_sa;
+ u32 i2c_dxr;
+ u32 i2c_con;
+ u32 i2c_iv;
+ u32 res_2c;
+ u32 i2c_psc;
+};

/* I2C masks */

--
1.7.9.5