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i2c: mvtwsi: Support for up to 4 different controllers 

Orion5x, Kirkwood and Armada XP platforms come with a single TWSI (I2C) MVTWSI
controller. However, other platforms using MVTWSI may come with more: this is
the case on Allwinner (sunxi) platforms, where up to 4 controllers can be found
on the same chip.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Acked-by: Heiko Schocher <hs@denx.de>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Paul Kocialkowski 2015-04-10 23:09:51 +02:00 committed by Hans de Goede
parent 1847c1da02
commit dd82242b4d
6 changed files with 104 additions and 34 deletions
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2
arch/arm/include/asm/arch-sunxi/i2c.h
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@ -8,7 +8,7 @@
#include <asm/arch/cpu.h>
#define CONFIG_I2C_MVTWSI_BASE SUNXI_TWI0_BASE
#define CONFIG_I2C_MVTWSI_BASE0 SUNXI_TWI0_BASE
/* This is abp0-clk on sun4i/5i/7i / abp1-clk on sun6i/sun8i which is 24MHz */
#define CONFIG_SYS_TCLK 24000000

2
arch/arm/mach-kirkwood/include/mach/config.h
View File

@ -44,7 +44,7 @@
#define CONFIG_SYS_INIT_SP_ADDR 0xC8012000
#define CONFIG_NR_DRAM_BANKS_MAX 2
#define CONFIG_I2C_MVTWSI_BASE KW_TWSI_BASE
#define CONFIG_I2C_MVTWSI_BASE0 KW_TWSI_BASE
#define MV_UART_CONSOLE_BASE KW_UART0_BASE
#define MV_SATA_BASE KW_SATA_BASE
#define MV_SATA_PORT0_OFFSET KW_SATA_PORT0_OFFSET

128
drivers/i2c/mvtwsi.c
View File

@ -14,7 +14,7 @@
#include <asm/io.h>
/*
* include a file that will provide CONFIG_I2C_MVTWSI_BASE
* include a file that will provide CONFIG_I2C_MVTWSI_BASE*
* and possibly other settings
*/
@ -91,11 +91,39 @@ struct mvtwsi_registers {
#define MVTWSI_STATUS_IDLE 0xF8
/*
* The single instance of the controller we'll be dealing with
* MVTWSI controller base
*/
static struct mvtwsi_registers *twsi =
(struct mvtwsi_registers *) CONFIG_I2C_MVTWSI_BASE;
static struct mvtwsi_registers *twsi_get_base(struct i2c_adapter *adap)
{
switch (adap->hwadapnr) {
#ifdef CONFIG_I2C_MVTWSI_BASE0
case 0:
return (struct mvtwsi_registers *) CONFIG_I2C_MVTWSI_BASE0;
#endif
#ifdef CONFIG_I2C_MVTWSI_BASE1
case 1:
return (struct mvtwsi_registers *) CONFIG_I2C_MVTWSI_BASE1;
#endif
#ifdef CONFIG_I2C_MVTWSI_BASE2
case 2:
return (struct mvtwsi_registers *) CONFIG_I2C_MVTWSI_BASE2;
#endif
#ifdef CONFIG_I2C_MVTWSI_BASE3
case 3:
return (struct mvtwsi_registers *) CONFIG_I2C_MVTWSI_BASE3;
#endif
#ifdef CONFIG_I2C_MVTWSI_BASE4
case 4:
return (struct mvtwsi_registers *) CONFIG_I2C_MVTWSI_BASE4;
#endif
default:
printf("Missing mvtwsi controller %d base\n", adap->hwadapnr);
break;
}
return NULL;
}
/*
* Returned statuses are 0 for success and nonzero otherwise.
@ -117,8 +145,9 @@ static struct mvtwsi_registers *twsi =
* Wait for IFLG to raise, or return 'timeout'; then if status is as expected,
* return 0 (ok) or return 'wrong status'.
*/
static int twsi_wait(int expected_status)
static int twsi_wait(struct i2c_adapter *adap, int expected_status)
{
struct mvtwsi_registers *twsi = twsi_get_base(adap);
int control, status;
int timeout = 1000;
@ -153,35 +182,40 @@ static u8 twsi_control_flags = MVTWSI_CONTROL_TWSIEN;
* Assert the START condition, either in a single I2C transaction
* or inside back-to-back ones (repeated starts).
*/
static int twsi_start(int expected_status)
static int twsi_start(struct i2c_adapter *adap, int expected_status)
{
struct mvtwsi_registers *twsi = twsi_get_base(adap);
/* globally set TWSIEN in case it was not */
twsi_control_flags |= MVTWSI_CONTROL_TWSIEN;
/* assert START */
writel(twsi_control_flags | MVTWSI_CONTROL_START, &twsi->control);
/* wait for controller to process START */
return twsi_wait(expected_status);
return twsi_wait(adap, expected_status);
}
/*
* Send a byte (i2c address or data).
*/
static int twsi_send(u8 byte, int expected_status)
static int twsi_send(struct i2c_adapter *adap, u8 byte, int expected_status)
{
struct mvtwsi_registers *twsi = twsi_get_base(adap);
/* put byte in data register for sending */
writel(byte, &twsi->data);
/* clear any pending interrupt -- that'll cause sending */
writel(twsi_control_flags, &twsi->control);
/* wait for controller to receive byte and check ACK */
return twsi_wait(expected_status);
return twsi_wait(adap, expected_status);
}
/*
* Receive a byte.
* Global mvtwsi_control_flags variable says if we should ack or nak.
*/
static int twsi_recv(u8 *byte)
static int twsi_recv(struct i2c_adapter *adap, u8 *byte)
{
struct mvtwsi_registers *twsi = twsi_get_base(adap);
int expected_status, status;
/* compute expected status based on ACK bit in global control flags */
@ -192,7 +226,7 @@ static int twsi_recv(u8 *byte)
/* acknowledge *previous state* and launch receive */
writel(twsi_control_flags, &twsi->control);
/* wait for controller to receive byte and assert ACK or NAK */
status = twsi_wait(expected_status);
status = twsi_wait(adap, expected_status);
/* if we did receive expected byte then store it */
if (status == 0)
*byte = readl(&twsi->data);
@ -204,8 +238,9 @@ static int twsi_recv(u8 *byte)
* Assert the STOP condition.
* This is also used to force the bus back in idle (SDA=SCL=1).
*/
static int twsi_stop(int status)
static int twsi_stop(struct i2c_adapter *adap, int status)
{
struct mvtwsi_registers *twsi = twsi_get_base(adap);
int control, stop_status;
int timeout = 1000;
@ -244,6 +279,7 @@ static unsigned int twsi_calc_freq(const int n, const int m)
*/
static void twsi_reset(struct i2c_adapter *adap)
{
struct mvtwsi_registers *twsi = twsi_get_base(adap);
/* ensure controller will be enabled by any twsi*() function */
twsi_control_flags = MVTWSI_CONTROL_TWSIEN;
/* reset controller */
@ -259,6 +295,7 @@ static void twsi_reset(struct i2c_adapter *adap)
static unsigned int twsi_i2c_set_bus_speed(struct i2c_adapter *adap,
unsigned int requested_speed)
{
struct mvtwsi_registers *twsi = twsi_get_base(adap);
unsigned int tmp_speed, highest_speed, n, m;
unsigned int baud = 0x44; /* baudrate at controller reset */
@ -281,6 +318,8 @@ static unsigned int twsi_i2c_set_bus_speed(struct i2c_adapter *adap,
static void twsi_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd)
{
struct mvtwsi_registers *twsi = twsi_get_base(adap);
/* reset controller */
twsi_reset(adap);
/* set speed */
@ -289,7 +328,7 @@ static void twsi_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd)
writel(slaveadd, &twsi->slave_address);
writel(0, &twsi->xtnd_slave_addr);
/* assert STOP but don't care for the result */
(void) twsi_stop(0);
(void) twsi_stop(adap, 0);
}
/*
@ -297,7 +336,8 @@ static void twsi_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd)
* Common to i2c_probe, i2c_read and i2c_write.
* Expected address status will derive from direction bit (bit 0) in addr.
*/
static int i2c_begin(int expected_start_status, u8 addr)
static int i2c_begin(struct i2c_adapter *adap, int expected_start_status,
u8 addr)
{
int status, expected_addr_status;
@ -307,10 +347,10 @@ static int i2c_begin(int expected_start_status, u8 addr)
else /* writing */
expected_addr_status = MVTWSI_STATUS_ADDR_W_ACK;
/* assert START */
status = twsi_start(expected_start_status);
status = twsi_start(adap, expected_start_status);
/* send out the address if the start went well */
if (status == 0)
status = twsi_send(addr, expected_addr_status);
status = twsi_send(adap, addr, expected_addr_status);
/* return ok or status of first failure to caller */
return status;
}
@ -325,12 +365,12 @@ static int twsi_i2c_probe(struct i2c_adapter *adap, uchar chip)
int status;
/* begin i2c read */
status = i2c_begin(MVTWSI_STATUS_START, (chip << 1) | 1);
status = i2c_begin(adap, MVTWSI_STATUS_START, (chip << 1) | 1);
/* dummy read was accepted: receive byte but NAK it. */
if (status == 0)
status = twsi_recv(&dummy_byte);
status = twsi_recv(adap, &dummy_byte);
/* Stop transaction */
twsi_stop(0);
twsi_stop(adap, 0);
/* return 0 or status of first failure */
return status;
}
@ -351,15 +391,15 @@ static int twsi_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
int status;
/* begin i2c write to send the address bytes */
status = i2c_begin(MVTWSI_STATUS_START, (chip << 1));
status = i2c_begin(adap, MVTWSI_STATUS_START, (chip << 1));
/* send addr bytes */
while ((status == 0) && alen--)
status = twsi_send(addr >> (8*alen),
status = twsi_send(adap, addr >> (8*alen),
MVTWSI_STATUS_DATA_W_ACK);
/* begin i2c read to receive eeprom data bytes */
if (status == 0)
status = i2c_begin(
MVTWSI_STATUS_REPEATED_START, (chip << 1) | 1);
status = i2c_begin(adap, MVTWSI_STATUS_REPEATED_START,
(chip << 1) | 1);
/* prepare ACK if at least one byte must be received */
if (length > 0)
twsi_control_flags |= MVTWSI_CONTROL_ACK;
@ -369,10 +409,10 @@ static int twsi_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
if (length == 0)
twsi_control_flags &= ~MVTWSI_CONTROL_ACK;
/* read current byte */
status = twsi_recv(data++);
status = twsi_recv(adap, data++);
}
/* Stop transaction */
status = twsi_stop(status);
status = twsi_stop(adap, status);
/* return 0 or status of first failure */
return status;
}
@ -387,21 +427,51 @@ static int twsi_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
int status;
/* begin i2c write to send the eeprom adress bytes then data bytes */
status = i2c_begin(MVTWSI_STATUS_START, (chip << 1));
status = i2c_begin(adap, MVTWSI_STATUS_START, (chip << 1));
/* send addr bytes */
while ((status == 0) && alen--)
status = twsi_send(addr >> (8*alen),
status = twsi_send(adap, addr >> (8*alen),
MVTWSI_STATUS_DATA_W_ACK);
/* send data bytes */
while ((status == 0) && (length-- > 0))
status = twsi_send(*(data++), MVTWSI_STATUS_DATA_W_ACK);
status = twsi_send(adap, *(data++), MVTWSI_STATUS_DATA_W_ACK);
/* Stop transaction */
status = twsi_stop(status);
status = twsi_stop(adap, status);
/* return 0 or status of first failure */
return status;
}
#ifdef CONFIG_I2C_MVTWSI_BASE0
U_BOOT_I2C_ADAP_COMPLETE(twsi0, twsi_i2c_init, twsi_i2c_probe,
twsi_i2c_read, twsi_i2c_write,
twsi_i2c_set_bus_speed,
CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE, 0)
#endif
#ifdef CONFIG_I2C_MVTWSI_BASE1
U_BOOT_I2C_ADAP_COMPLETE(twsi1, twsi_i2c_init, twsi_i2c_probe,
twsi_i2c_read, twsi_i2c_write,
twsi_i2c_set_bus_speed,
CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE, 1)
#endif
#ifdef CONFIG_I2C_MVTWSI_BASE2
U_BOOT_I2C_ADAP_COMPLETE(twsi2, twsi_i2c_init, twsi_i2c_probe,
twsi_i2c_read, twsi_i2c_write,
twsi_i2c_set_bus_speed,
CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE, 2)
#endif
#ifdef CONFIG_I2C_MVTWSI_BASE3
U_BOOT_I2C_ADAP_COMPLETE(twsi3, twsi_i2c_init, twsi_i2c_probe,
twsi_i2c_read, twsi_i2c_write,
twsi_i2c_set_bus_speed,
CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE, 3)
#endif
#ifdef CONFIG_I2C_MVTWSI_BASE4
U_BOOT_I2C_ADAP_COMPLETE(twsi4, twsi_i2c_init, twsi_i2c_probe,
twsi_i2c_read, twsi_i2c_write,
twsi_i2c_set_bus_speed,
CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE, 4)
#endif

2
include/configs/db-mv784mp-gp.h
View File

@ -37,7 +37,7 @@
/* I2C */
#define CONFIG_SYS_I2C
#define CONFIG_SYS_I2C_MVTWSI
#define CONFIG_I2C_MVTWSI_BASE MVEBU_TWSI_BASE
#define CONFIG_I2C_MVTWSI_BASE0 MVEBU_TWSI_BASE
#define CONFIG_SYS_I2C_SLAVE 0x0
#define CONFIG_SYS_I2C_SPEED 100000

2
include/configs/edminiv2.h
View File

@ -208,7 +208,7 @@
#ifdef CONFIG_CMD_I2C
#define CONFIG_SYS_I2C
#define CONFIG_SYS_I2C_MVTWSI
#define CONFIG_I2C_MVTWSI_BASE ORION5X_TWSI_BASE
#define CONFIG_I2C_MVTWSI_BASE0 ORION5X_TWSI_BASE
#define CONFIG_SYS_I2C_SLAVE 0x0
#define CONFIG_SYS_I2C_SPEED 100000
#endif

2
include/configs/maxbcm.h
View File

@ -35,7 +35,7 @@
/* I2C */
#define CONFIG_SYS_I2C
#define CONFIG_SYS_I2C_MVTWSI
#define CONFIG_I2C_MVTWSI_BASE MVEBU_TWSI_BASE
#define CONFIG_I2C_MVTWSI_BASE0 MVEBU_TWSI_BASE
#define CONFIG_SYS_I2C_SLAVE 0x0
#define CONFIG_SYS_I2C_SPEED 100000