* Driver for the TWSI (i2c) controller found on the Marvell
* orion5x and kirkwood SoC families.
*
- * Author: Albert Aribaud <albert.aribaud@free.fr>
+ * Author: Albert Aribaud <albert.u.boot@aribaud.net>
* Copyright (c) 2010 Albert Aribaud.
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
- * MA 02110-1301 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
/*
- * include a file that will provide CONFIG_I2C_MVTWSI_BASE
- * and possibly other settings
+ * Include a file that will provide CONFIG_I2C_MVTWSI_BASE*, and possibly other
+ * settings
*/
#if defined(CONFIG_ORION5X)
#include <asm/arch/orion5x.h>
-#elif defined(CONFIG_KIRKWOOD)
-#include <asm/arch/kirkwood.h>
+#elif (defined(CONFIG_KIRKWOOD) || defined(CONFIG_ARCH_MVEBU))
+#include <asm/arch/soc.h>
+#elif defined(CONFIG_SUNXI)
+#include <asm/arch/i2c.h>
#else
#error Driver mvtwsi not supported by SoC or board
#endif
* TWSI register structure
*/
+#ifdef CONFIG_SUNXI
+
+struct mvtwsi_registers {
+ u32 slave_address;
+ u32 xtnd_slave_addr;
+ u32 data;
+ u32 control;
+ u32 status;
+ u32 baudrate;
+ u32 soft_reset;
+};
+
+#else
+
struct mvtwsi_registers {
u32 slave_address;
u32 data;
u32 control;
union {
- u32 status; /* when reading */
- u32 baudrate; /* when writing */
+ u32 status; /* When reading */
+ u32 baudrate; /* When writing */
};
u32 xtnd_slave_addr;
u32 reserved[2];
u32 soft_reset;
};
+#endif
+
/*
- * Control register fields
+ * enum mvtwsi_ctrl_register_fields - Bit masks for flags in the control
+ * register
*/
+enum mvtwsi_ctrl_register_fields {
+ /* Acknowledge bit */
+ MVTWSI_CONTROL_ACK = 0x00000004,
+ /* Interrupt flag */
+ MVTWSI_CONTROL_IFLG = 0x00000008,
+ /* Stop bit */
+ MVTWSI_CONTROL_STOP = 0x00000010,
+ /* Start bit */
+ MVTWSI_CONTROL_START = 0x00000020,
+ /* I2C enable */
+ MVTWSI_CONTROL_TWSIEN = 0x00000040,
+ /* Interrupt enable */
+ MVTWSI_CONTROL_INTEN = 0x00000080,
+};
-#define MVTWSI_CONTROL_ACK 0x00000004
-#define MVTWSI_CONTROL_IFLG 0x00000008
-#define MVTWSI_CONTROL_STOP 0x00000010
-#define MVTWSI_CONTROL_START 0x00000020
-#define MVTWSI_CONTROL_TWSIEN 0x00000040
-#define MVTWSI_CONTROL_INTEN 0x00000080
+/*
+ * On sun6i and newer, IFLG is a write-clear bit, which is cleared by writing 1;
+ * on other platforms, it is a normal r/w bit, which is cleared by writing 0.
+ */
+
+#ifdef CONFIG_SUNXI_GEN_SUN6I
+#define MVTWSI_CONTROL_CLEAR_IFLG 0x00000008
+#else
+#define MVTWSI_CONTROL_CLEAR_IFLG 0x00000000
+#endif
/*
- * Status register values -- only those expected in normal master
- * operation on non-10-bit-address devices; whatever status we don't
- * expect in nominal conditions (bus errors, arbitration losses,
- * missing ACKs...) we just pass back to the caller as an error
+ * enum mvstwsi_status_values - Possible values of I2C controller's status
+ * register
+ *
+ * Only those statuses expected in normal master operation on
+ * non-10-bit-address devices are specified.
+ *
+ * Every status that's unexpected during normal operation (bus errors,
+ * arbitration losses, missing ACKs...) is passed back to the caller as an error
* code.
*/
+enum mvstwsi_status_values {
+ /* START condition transmitted */
+ MVTWSI_STATUS_START = 0x08,
+ /* Repeated START condition transmitted */
+ MVTWSI_STATUS_REPEATED_START = 0x10,
+ /* Address + write bit transmitted, ACK received */
+ MVTWSI_STATUS_ADDR_W_ACK = 0x18,
+ /* Data transmitted, ACK received */
+ MVTWSI_STATUS_DATA_W_ACK = 0x28,
+ /* Address + read bit transmitted, ACK received */
+ MVTWSI_STATUS_ADDR_R_ACK = 0x40,
+ /* Address + read bit transmitted, ACK not received */
+ MVTWSI_STATUS_ADDR_R_NAK = 0x48,
+ /* Data received, ACK transmitted */
+ MVTWSI_STATUS_DATA_R_ACK = 0x50,
+ /* Data received, ACK not transmitted */
+ MVTWSI_STATUS_DATA_R_NAK = 0x58,
+ /* No relevant status */
+ MVTWSI_STATUS_IDLE = 0xF8,
+};
-#define MVTWSI_STATUS_START 0x08
-#define MVTWSI_STATUS_REPEATED_START 0x10
-#define MVTWSI_STATUS_ADDR_W_ACK 0x18
-#define MVTWSI_STATUS_DATA_W_ACK 0x28
-#define MVTWSI_STATUS_ADDR_R_ACK 0x40
-#define MVTWSI_STATUS_ADDR_R_NAK 0x48
-#define MVTWSI_STATUS_DATA_R_ACK 0x50
-#define MVTWSI_STATUS_DATA_R_NAK 0x58
-#define MVTWSI_STATUS_IDLE 0xF8
+/*
+ * enum mvstwsi_ack_flags - Determine whether a read byte should be
+ * acknowledged or not.
+ */
+enum mvtwsi_ack_flags {
+ /* Send NAK after received byte */
+ MVTWSI_READ_NAK = 0,
+ /* Send ACK after received byte */
+ MVTWSI_READ_ACK = 1,
+};
/*
- * 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
+#ifdef CONFIG_I2C_MVTWSI_BASE5
+ case 5:
+ return (struct mvtwsi_registers *)CONFIG_I2C_MVTWSI_BASE5;
+#endif
+ default:
+ printf("Missing mvtwsi controller %d base\n", adap->hwadapnr);
+ break;
+ }
+
+ return NULL;
+}
/*
- * Returned statuses are 0 for success and nonzero otherwise.
- * Currently, cmd_i2c and cmd_eeprom do not interpret an error status.
- * Thus to ease debugging, the return status contains some debug info:
- * - bits 31..24 are error class: 1 is timeout, 2 is 'status mismatch'.
- * - bits 23..16 are the last value of the control register.
- * - bits 15..8 are the last value of the status register.
- * - bits 7..0 are the expected value of the status register.
+ * enum mvtwsi_error_class - types of I2C errors
*/
+enum mvtwsi_error_class {
+ /* The controller returned a different status than expected */
+ MVTWSI_ERROR_WRONG_STATUS = 0x01,
+ /* The controller timed out */
+ MVTWSI_ERROR_TIMEOUT = 0x02,
+};
-#define MVTWSI_ERROR_WRONG_STATUS 0x01
-#define MVTWSI_ERROR_TIMEOUT 0x02
-
-#define MVTWSI_ERROR(ec, lc, ls, es) (((ec << 24) & 0xFF000000) | \
- ((lc << 16) & 0x00FF0000) | ((ls<<8) & 0x0000FF00) | (es & 0xFF))
+/*
+ * mvtwsi_error() - Build I2C return code from error information
+ *
+ * For debugging purposes, this function packs some information of an occurred
+ * error into a return code. These error codes are returned from I2C API
+ * functions (i2c_{read,write}, dm_i2c_{read,write}, etc.).
+ *
+ * @ec: The error class of the error (enum mvtwsi_error_class).
+ * @lc: The last value of the control register.
+ * @ls: The last value of the status register.
+ * @es: The expected value of the status register.
+ * @return The generated error code.
+ */
+inline uint mvtwsi_error(uint ec, uint lc, uint ls, uint es)
+{
+ return ((ec << 24) & 0xFF000000)
+ | ((lc << 16) & 0x00FF0000)
+ | ((ls << 8) & 0x0000FF00)
+ | (es & 0xFF);
+}
/*
- * Wait for IFLG to raise, or return 'timeout'; then if status is as expected,
- * return 0 (ok) or return 'wrong status'.
+ * Wait for IFLG to raise, or return 'timeout.' Then, if the status is as
+ * expected, return 0 (ok) or 'wrong status' otherwise.
*/
-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;
if (status == expected_status)
return 0;
else
- return MVTWSI_ERROR(
+ return mvtwsi_error(
MVTWSI_ERROR_WRONG_STATUS,
control, status, expected_status);
}
- udelay(10); /* one clock cycle at 100 kHz */
+ udelay(10); /* One clock cycle at 100 kHz */
} while (timeout--);
status = readl(&twsi->status);
- return MVTWSI_ERROR(
- MVTWSI_ERROR_TIMEOUT, control, status, expected_status);
+ return mvtwsi_error(MVTWSI_ERROR_TIMEOUT, control, status,
+ expected_status);
}
-/*
- * These flags are ORed to any write to the control register
- * They allow global setting of TWSIEN and ACK.
- * By default none are set.
- * twsi_start() sets TWSIEN (in case the controller was disabled)
- * twsi_recv() sets ACK or resets it depending on expected status.
- */
-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)
{
- /* 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);
+ struct mvtwsi_registers *twsi = twsi_get_base(adap);
+
+ /* Assert START */
+ writel(MVTWSI_CONTROL_TWSIEN | MVTWSI_CONTROL_START |
+ MVTWSI_CONTROL_CLEAR_IFLG, &twsi->control);
+ /* Wait for controller to process START */
+ 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)
{
- /* put byte in data register for sending */
+ struct mvtwsi_registers *twsi = twsi_get_base(adap);
+
+ /* Write byte to 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);
+ /* Clear any pending interrupt -- that will cause sending */
+ writel(MVTWSI_CONTROL_TWSIEN | MVTWSI_CONTROL_CLEAR_IFLG,
+ &twsi->control);
+ /* Wait for controller to receive byte, and check ACK */
+ 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, int ack_flag)
{
- int expected_status, status;
-
- /* compute expected status based on ACK bit in global control flags */
- if (twsi_control_flags & MVTWSI_CONTROL_ACK)
- expected_status = MVTWSI_STATUS_DATA_R_ACK;
- else
- expected_status = MVTWSI_STATUS_DATA_R_NAK;
- /* 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);
- /* if we did receive expected byte then store it */
+ struct mvtwsi_registers *twsi = twsi_get_base(adap);
+ int expected_status, status, control;
+
+ /* Compute expected status based on passed ACK flag */
+ expected_status = ack_flag ? MVTWSI_STATUS_DATA_R_ACK :
+ MVTWSI_STATUS_DATA_R_NAK;
+ /* Acknowledge *previous state*, and launch receive */
+ control = MVTWSI_CONTROL_TWSIEN;
+ control |= ack_flag == MVTWSI_READ_ACK ? MVTWSI_CONTROL_ACK : 0;
+ writel(control | MVTWSI_CONTROL_CLEAR_IFLG, &twsi->control);
+ /* Wait for controller to receive byte, and assert ACK or NAK */
+ status = twsi_wait(adap, expected_status);
+ /* If we did receive the expected byte, store it */
if (status == 0)
*byte = readl(&twsi->data);
- /* return status */
return status;
}
/*
* Assert the STOP condition.
- * This is also used to force the bus back in idle (SDA=SCL=1).
+ * This is also used to force the bus back to 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;
- /* assert STOP */
+ /* Assert STOP */
control = MVTWSI_CONTROL_TWSIEN | MVTWSI_CONTROL_STOP;
- writel(control, &twsi->control);
- /* wait for IDLE; IFLG won't rise so twsi_wait() is no use. */
+ writel(control | MVTWSI_CONTROL_CLEAR_IFLG, &twsi->control);
+ /* Wait for IDLE; IFLG won't rise, so we can't use twsi_wait() */
do {
stop_status = readl(&twsi->status);
if (stop_status == MVTWSI_STATUS_IDLE)
break;
- udelay(10); /* one clock cycle at 100 kHz */
+ udelay(10); /* One clock cycle at 100 kHz */
} while (timeout--);
control = readl(&twsi->control);
if (stop_status != MVTWSI_STATUS_IDLE)
if (status == 0)
- status = MVTWSI_ERROR(
+ status = mvtwsi_error(
MVTWSI_ERROR_TIMEOUT,
control, status, MVTWSI_STATUS_IDLE);
return status;
}
-/*
- * Ugly formula to convert m and n values to a frequency comes from
- * TWSI specifications
- */
-
-#define TWSI_FREQUENCY(m, n) \
- ((u8) (CONFIG_SYS_TCLK / (10 * (m + 1) * 2 * (1 << n))))
-
-/*
- * These are required to be reprogrammed before enabling the controller
- * because a reset loses them.
- * Default values come from the spec, but a twsi_reset will change them.
- * twsi_slave_address left uninitialized lest checkpatch.pl complains.
- */
-
-/* Baudrate generator: m (bits 7..4) =4, n (bits 3..0) =4 */
-static u8 twsi_baud_rate = 0x44; /* baudrate at controller reset */
-/* Default frequency corresponding to default m=4, n=4 */
-static u8 twsi_actual_speed = TWSI_FREQUENCY(4, 4);
-/* Default slave address is 0 (so is an uninitialized static) */
-static u8 twsi_slave_address;
+static unsigned int twsi_calc_freq(const int n, const int m)
+{
+#ifdef CONFIG_SUNXI
+ return CONFIG_SYS_TCLK / (10 * (m + 1) * (1 << n));
+#else
+ return CONFIG_SYS_TCLK / (10 * (m + 1) * (2 << n));
+#endif
+}
/*
* Reset controller.
- * Called at end of i2c_init unsuccessful i2c transactions.
* Controller reset also resets the baud rate and slave address, so
- * re-establish them.
+ * they must be re-established afterwards.
*/
-static void twsi_reset(void)
+static void twsi_reset(struct i2c_adapter *adap)
{
- /* ensure controller will be enabled by any twsi*() function */
- twsi_control_flags = MVTWSI_CONTROL_TWSIEN;
- /* reset controller */
+ struct mvtwsi_registers *twsi = twsi_get_base(adap);
+
+ /* Reset controller */
writel(0, &twsi->soft_reset);
- /* wait 2 ms -- this is what the Marvell LSP does */
+ /* Wait 2 ms -- this is what the Marvell LSP does */
udelay(20000);
- /* set baud rate */
- writel(twsi_baud_rate, &twsi->baudrate);
- /* set slave address even though we don't use it */
- writel(twsi_slave_address, &twsi->slave_address);
- writel(0, &twsi->xtnd_slave_addr);
- /* assert STOP but don't care for the result */
- (void) twsi_stop(0);
}
/*
- * I2C init called by cmd_i2c when doing 'i2c reset'.
- * Sets baud to the highest possible value not exceeding requested one.
+ * Sets baud to the highest possible value not exceeding the requested one.
*/
-void i2c_init(int requested_speed, int slaveadd)
+static unsigned int twsi_i2c_set_bus_speed(struct i2c_adapter *adap,
+ unsigned int requested_speed)
{
- int tmp_speed, highest_speed, n, m;
- int baud = 0x44; /* baudrate at controller reset */
+ struct mvtwsi_registers *twsi = twsi_get_base(adap);
+ unsigned int tmp_speed, highest_speed, n, m;
+ unsigned int baud = 0x44; /* Baud rate after controller reset */
- /* use actual speed to collect progressively higher values */
highest_speed = 0;
- /* compute m, n setting for highest speed not above requested speed */
+ /* Successively try m, n combinations, and use the combination
+ * resulting in the largest speed that's not above the requested
+ * speed */
for (n = 0; n < 8; n++) {
for (m = 0; m < 16; m++) {
- tmp_speed = TWSI_FREQUENCY(m, n);
- if ((tmp_speed <= requested_speed)
- && (tmp_speed > highest_speed)) {
+ tmp_speed = twsi_calc_freq(n, m);
+ if ((tmp_speed <= requested_speed) &&
+ (tmp_speed > highest_speed)) {
highest_speed = tmp_speed;
baud = (m << 3) | n;
}
}
}
- /* save baud rate and slave for later calls to twsi_reset */
- twsi_baud_rate = baud;
- twsi_actual_speed = highest_speed;
- twsi_slave_address = slaveadd;
- /* reset controller */
- twsi_reset();
+ writel(baud, &twsi->baudrate);
+ return 0;
+}
+
+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 */
+ twsi_i2c_set_bus_speed(adap, speed);
+ /* Set slave address; even though we don't use it */
+ writel(slaveadd, &twsi->slave_address);
+ writel(0, &twsi->xtnd_slave_addr);
+ /* Assert STOP, but don't care for the result */
+ (void) twsi_stop(adap, 0);
}
/*
* Begin I2C transaction with expected start status, at given address.
- * 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;
- /* compute expected address status from direction bit in addr */
- if (addr & 1) /* reading */
+ /* Compute the expected address status from the direction bit in
+ * the address byte */
+ if (addr & 1) /* Reading */
expected_addr_status = MVTWSI_STATUS_ADDR_R_ACK;
- else /* writing */
+ else /* Writing */
expected_addr_status = MVTWSI_STATUS_ADDR_W_ACK;
- /* assert START */
- status = twsi_start(expected_start_status);
- /* send out the address if the start went well */
+ /* Assert START */
+ 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);
- /* return ok or status of first failure to caller */
+ status = twsi_send(adap, addr, expected_addr_status);
+ /* Return 0, or the status of the first failure */
return status;
}
/*
- * I2C probe called by cmd_i2c when doing 'i2c probe'.
* Begin read, nak data byte, end.
*/
-int i2c_probe(uchar chip)
+static int twsi_i2c_probe(struct i2c_adapter *adap, uchar chip)
{
u8 dummy_byte;
int status;
- /* begin i2c read */
- status = i2c_begin(MVTWSI_STATUS_START, (chip << 1) | 1);
- /* dummy read was accepted: receive byte but NAK it. */
+ /* Begin i2c read */
+ 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, MVTWSI_READ_NAK);
/* Stop transaction */
- twsi_stop(0);
- /* return 0 or status of first failure */
+ twsi_stop(adap, 0);
+ /* Return 0, or the status of the first failure */
return status;
}
/*
- * I2C read called by cmd_i2c when doing 'i2c read' and by cmd_eeprom.c
* Begin write, send address byte(s), begin read, receive data bytes, end.
*
- * NOTE: some EEPROMS want a stop right before the second start, while
- * some will choke if it is there. Deciding which we should do is eeprom
- * stuff, not i2c, but at the moment the APIs won't let us put it in
- * cmd_eeprom, so we have to choose here, and for the moment that'll be
- * a repeated start without a preceding stop.
+ * NOTE: Some devices want a stop right before the second start, while some
+ * will choke if it is there. Since deciding this is not yet supported in
+ * higher level APIs, we need to make a decision here, and for the moment that
+ * will be a repeated start without a preceding stop.
*/
-int i2c_read(u8 dev, uint addr, int alen, u8 *data, int length)
+static int twsi_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
+ int alen, uchar *data, int length)
{
int status;
- /* begin i2c write to send the address bytes */
- status = i2c_begin(MVTWSI_STATUS_START, (dev << 1));
- /* send addr bytes */
+ /* Begin i2c write to send the address bytes */
+ status = i2c_begin(adap, MVTWSI_STATUS_START, (chip << 1));
+ /* Send address 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 */
+ /* Begin i2c read to receive data bytes */
if (status == 0)
- status = i2c_begin(
- MVTWSI_STATUS_REPEATED_START, (dev << 1) | 1);
- /* prepare ACK if at least one byte must be received */
- if (length > 0)
- twsi_control_flags |= MVTWSI_CONTROL_ACK;
- /* now receive actual bytes */
- while ((status == 0) && length--) {
- /* reset NAK if we if no more to read now */
- if (length == 0)
- twsi_control_flags &= ~MVTWSI_CONTROL_ACK;
- /* read current byte */
- status = twsi_recv(data++);
- }
+ status = i2c_begin(adap, MVTWSI_STATUS_REPEATED_START,
+ (chip << 1) | 1);
+ /* Receive actual data bytes; set NAK if we if we have nothing more to
+ * read */
+ while ((status == 0) && length--)
+ status = twsi_recv(adap, data++,
+ length > 0 ?
+ MVTWSI_READ_ACK : MVTWSI_READ_NAK);
/* Stop transaction */
- status = twsi_stop(status);
- /* return 0 or status of first failure */
+ status = twsi_stop(adap, status);
+ /* Return 0, or the status of the first failure */
return status;
}
/*
- * I2C write called by cmd_i2c when doing 'i2c write' and by cmd_eeprom.c
* Begin write, send address byte(s), send data bytes, end.
*/
-int i2c_write(u8 dev, uint addr, int alen, u8 *data, int length)
+static int twsi_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
+ int alen, uchar *data, int length)
{
int status;
- /* begin i2c write to send the eeprom adress bytes then data bytes */
- status = i2c_begin(MVTWSI_STATUS_START, (dev << 1));
- /* send addr bytes */
+ /* Begin i2c write to send first the address bytes, then the
+ * data bytes */
+ status = i2c_begin(adap, MVTWSI_STATUS_START, (chip << 1));
+ /* Send address 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 */
+ /* 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);
- /* return 0 or status of first failure */
+ status = twsi_stop(adap, status);
+ /* Return 0, or the status of the first failure */
return status;
}
-/*
- * Bus set routine: we only support bus 0.
- */
-int i2c_set_bus_num(unsigned int bus)
-{
- if (bus > 0) {
- return -1;
- }
- return 0;
-}
+#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)
-/*
- * Bus get routine: hard-return bus 0.
- */
-unsigned int i2c_get_bus_num(void)
-{
- return 0;
-}
+#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
+#ifdef CONFIG_I2C_MVTWSI_BASE5
+U_BOOT_I2C_ADAP_COMPLETE(twsi5, 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, 5)
+
+#endif
projects / u-boot / blobdiff