// SPDX-License-Identifier: GPL-2.0+ /* * Driver for the TWSI (i2c) controller found on the Marvell * orion5x and kirkwood SoC families. * * Author: Albert Aribaud * Copyright (c) 2010 Albert Aribaud. */ #include #include #include #include #include #include #include #include #include #if CONFIG_IS_ENABLED(DM_I2C) #include #include #include #endif DECLARE_GLOBAL_DATA_PTR; /* * Include a file that will provide CONFIG_I2C_MVTWSI_BASE*, and possibly other * settings */ #if !CONFIG_IS_ENABLED(DM_I2C) #if defined(CONFIG_ARCH_ORION5X) #include #elif (defined(CONFIG_ARCH_KIRKWOOD) || defined(CONFIG_ARCH_MVEBU)) #include #elif defined(CONFIG_ARCH_SUNXI) #include #else #error Driver mvtwsi not supported by SoC or board #endif #endif /* CONFIG_DM_I2C */ /* * On SUNXI, we get CFG_SYS_TCLK from this include, so we want to * always have it. */ #if CONFIG_IS_ENABLED(DM_I2C) && defined(CONFIG_ARCH_SUNXI) #include #endif /* * TWSI register structure */ #ifdef CONFIG_ARCH_SUNXI struct mvtwsi_registers { u32 slave_address; u32 xtnd_slave_addr; u32 data; u32 control; u32 status; u32 baudrate; u32 soft_reset; u32 debug; /* Dummy field for build compatibility with mvebu */ }; #else struct mvtwsi_registers { u32 slave_address; u32 data; u32 control; union { u32 status; /* When reading */ u32 baudrate; /* When writing */ }; u32 xtnd_slave_addr; u32 reserved0[2]; u32 soft_reset; u32 reserved1[27]; u32 debug; }; #endif #if CONFIG_IS_ENABLED(DM_I2C) struct mvtwsi_i2c_dev { /* TWSI Register base for the device */ struct mvtwsi_registers *base; /* Number of the device (determined from cell-index property) */ int index; /* The I2C slave address for the device */ u8 slaveadd; /* The configured I2C speed in Hz */ uint speed; /* The current length of a clock period (depending on speed) */ uint tick; }; #endif /* CONFIG_DM_I2C */ /* * 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, }; /* * 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. */ #if defined(CONFIG_SUNXI_GEN_SUN6I) || defined(CONFIG_SUN50I_GEN_H6) #define MVTWSI_CONTROL_CLEAR_IFLG 0x00000008 #else #define MVTWSI_CONTROL_CLEAR_IFLG 0x00000000 #endif /* * 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, }; /* * 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, }; /* * calc_tick() - Calculate the duration of a clock cycle from the I2C speed * * @speed: The speed in Hz to calculate the clock cycle duration for. * Return: The duration of a clock cycle in ns. */ inline uint calc_tick(uint speed) { /* One tick = the duration of a period at the specified speed in ns (we * add 100 ns to be on the safe side) */ return (1000000000u / speed) + 100; } #if !CONFIG_IS_ENABLED(DM_I2C) /* * twsi_get_base() - Get controller register base for specified adapter * * @adap: Adapter to get the register base for. * Return: Register base for the specified adapter. */ 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; } #endif /* * 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, }; /* * 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); } /* * twsi_wait() - Wait for I2C bus interrupt flag and check status, or time out. * * Return: Zero if status is as expected, or a non-zero code if either a time * out occurred, or the status was not the expected one. */ static int twsi_wait(struct mvtwsi_registers *twsi, int expected_status, uint tick) { int control, status; int timeout = 1000; do { control = readl(&twsi->control); if (control & MVTWSI_CONTROL_IFLG) { /* * On Armada 38x it seems that the controller works as * if it first set the MVTWSI_CONTROL_IFLAG in the * control register and only after that it changed the * status register. * This sometimes caused weird bugs which only appeared * on selected I2C speeds and even then only sometimes. * We therefore add here a simple ndealy(100), which * seems to fix this weird bug. */ ndelay(100); status = readl(&twsi->status); if (status == expected_status) return 0; else return mvtwsi_error( MVTWSI_ERROR_WRONG_STATUS, control, status, expected_status); } ndelay(tick); /* One clock cycle */ } while (timeout--); status = readl(&twsi->status); return mvtwsi_error(MVTWSI_ERROR_TIMEOUT, control, status, expected_status); } /* * twsi_start() - Assert a START condition on the bus. * * This function is used in both single I2C transactions and inside * back-to-back transactions (repeated starts). * * @twsi: The MVTWSI register structure to use. * @expected_status: The I2C bus status expected to be asserted after the * operation completion. * @tick: The duration of a clock cycle at the current I2C speed. * Return: Zero if status is as expected, or a non-zero code if either a time * out occurred or the status was not the expected one. */ static int twsi_start(struct mvtwsi_registers *twsi, int expected_status, uint tick) { /* Assert START */ writel(MVTWSI_CONTROL_TWSIEN | MVTWSI_CONTROL_START | MVTWSI_CONTROL_CLEAR_IFLG, &twsi->control); /* Wait for controller to process START */ return twsi_wait(twsi, expected_status, tick); } /* * twsi_send() - Send a byte on the I2C bus. * * The byte may be part of an address byte or data. * * @twsi: The MVTWSI register structure to use. * @byte: The byte to send. * @expected_status: The I2C bus status expected to be asserted after the * operation completion. * @tick: The duration of a clock cycle at the current I2C speed. * Return: Zero if status is as expected, or a non-zero code if either a time * out occurred or the status was not the expected one. */ static int twsi_send(struct mvtwsi_registers *twsi, u8 byte, int expected_status, uint tick) { /* Write byte to data register for sending */ writel(byte, &twsi->data); /* 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(twsi, expected_status, tick); } /* * twsi_recv() - Receive a byte on the I2C bus. * * The static variable mvtwsi_control_flags controls whether we ack or nak. * * @twsi: The MVTWSI register structure to use. * @byte: The byte to send. * @ack_flag: Flag that determines whether the received byte should * be acknowledged by the controller or not (sent ACK/NAK). * @tick: The duration of a clock cycle at the current I2C speed. * Return: Zero if status is as expected, or a non-zero code if either a time * out occurred or the status was not the expected one. */ static int twsi_recv(struct mvtwsi_registers *twsi, u8 *byte, int ack_flag, uint tick) { 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(twsi, expected_status, tick); /* If we did receive the expected byte, store it */ if (status == 0) *byte = readl(&twsi->data); return status; } /* * twsi_stop() - Assert a STOP condition on the bus. * * This function is also used to force the bus back to idle state (SDA = * SCL = 1). * * @twsi: The MVTWSI register structure to use. * @tick: The duration of a clock cycle at the current I2C speed. * Return: Zero if the operation succeeded, or a non-zero code if a time out * occurred. */ static int twsi_stop(struct mvtwsi_registers *twsi, uint tick) { int control, stop_status; int status = 0; int timeout = 1000; /* Assert STOP */ control = MVTWSI_CONTROL_TWSIEN | MVTWSI_CONTROL_STOP; 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; ndelay(tick); /* One clock cycle */ } while (timeout--); control = readl(&twsi->control); if (stop_status != MVTWSI_STATUS_IDLE) status = mvtwsi_error(MVTWSI_ERROR_TIMEOUT, control, status, MVTWSI_STATUS_IDLE); return status; } /* * twsi_calc_freq() - Compute I2C frequency depending on m and n parameters. * * @n: Parameter 'n' for the frequency calculation algorithm. * @m: Parameter 'm' for the frequency calculation algorithm. * Return: The I2C frequency corresponding to the passed m and n parameters. */ static uint twsi_calc_freq(const int n, const int m) { #ifdef CONFIG_ARCH_SUNXI return CFG_SYS_TCLK / (10 * (m + 1) * (1 << n)); #else return CFG_SYS_TCLK / (10 * (m + 1) * (2 << n)); #endif } /* * twsi_reset() - Reset the I2C controller. * * Resetting the controller also resets the baud rate and slave address, hence * they must be re-established after the reset. * * @twsi: The MVTWSI register structure to use. */ static void twsi_reset(struct mvtwsi_registers *twsi) { /* Reset controller */ writel(0, &twsi->soft_reset); /* Wait 2 ms -- this is what the Marvell LSP does */ udelay(20000); } /* * __twsi_i2c_set_bus_speed() - Set the speed of the I2C controller. * * This function sets baud rate to the highest possible value that does not * exceed the requested rate. * * @twsi: The MVTWSI register structure to use. * @requested_speed: The desired frequency the controller should run at * in Hz. * Return: The actual frequency the controller was configured to. */ static uint __twsi_i2c_set_bus_speed(struct mvtwsi_registers *twsi, uint requested_speed) { uint tmp_speed, highest_speed, n, m; uint baud = 0x44; /* Baud rate after controller reset */ highest_speed = 0; /* 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_calc_freq(n, m); if ((tmp_speed <= requested_speed) && (tmp_speed > highest_speed)) { highest_speed = tmp_speed; baud = (m << 3) | n; } } } writel(baud, &twsi->baudrate); /* Wait for controller for one tick */ #if CONFIG_IS_ENABLED(DM_I2C) ndelay(calc_tick(highest_speed)); #else ndelay(10000); #endif return highest_speed; } /* * __twsi_i2c_init() - Initialize the I2C controller. * * @twsi: The MVTWSI register structure to use. * @speed: The initial frequency the controller should run at * in Hz. * @slaveadd: The I2C address to be set for the I2C master. * @actual_speed: A output parameter that receives the actual frequency * in Hz the controller was set to by the function. * Return: Zero if the operation succeeded, or a non-zero code if a time out * occurred. */ static void __twsi_i2c_init(struct mvtwsi_registers *twsi, int speed, int slaveadd, uint *actual_speed) { uint tmp_speed; /* Reset controller */ twsi_reset(twsi); /* Set speed */ tmp_speed = __twsi_i2c_set_bus_speed(twsi, speed); if (actual_speed) *actual_speed = tmp_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 */ #if CONFIG_IS_ENABLED(DM_I2C) (void) twsi_stop(twsi, calc_tick(*actual_speed)); #else (void) twsi_stop(twsi, 10000); #endif } /* * i2c_begin() - Start a I2C transaction. * * Begin a I2C transaction with a given expected start status and chip address. * A START is asserted, and the address byte is sent to the I2C controller. The * expected address status will be derived from the direction bit (bit 0) of * the address byte. * * @twsi: The MVTWSI register structure to use. * @expected_start_status: The I2C status the controller is expected to * assert after the address byte was sent. * @addr: The address byte to be sent. * @tick: The duration of a clock cycle at the current * I2C speed. * Return: Zero if the operation succeeded, or a non-zero code if a time out or * unexpected I2C status occurred. */ static int i2c_begin(struct mvtwsi_registers *twsi, int expected_start_status, u8 addr, uint tick) { int status, expected_addr_status; /* 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 */ expected_addr_status = MVTWSI_STATUS_ADDR_W_ACK; /* Assert START */ status = twsi_start(twsi, expected_start_status, tick); /* Send out the address if the start went well */ if (status == 0) status = twsi_send(twsi, addr, expected_addr_status, tick); /* Return 0, or the status of the first failure */ return status; } /* * __twsi_i2c_probe_chip() - Probe the given I2C chip address. * * This function begins a I2C read transaction, does a dummy read and NAKs; if * the procedure succeeds, the chip is considered to be present. * * @twsi: The MVTWSI register structure to use. * @chip: The chip address to probe. * @tick: The duration of a clock cycle at the current I2C speed. * Return: Zero if the operation succeeded, or a non-zero code if a time out or * unexpected I2C status occurred. */ static int __twsi_i2c_probe_chip(struct mvtwsi_registers *twsi, uchar chip, uint tick) { u8 dummy_byte; int status; /* Begin i2c read */ status = i2c_begin(twsi, MVTWSI_STATUS_START, (chip << 1) | 1, tick); /* Dummy read was accepted: receive byte, but NAK it. */ if (status == 0) status = twsi_recv(twsi, &dummy_byte, MVTWSI_READ_NAK, tick); /* Stop transaction */ twsi_stop(twsi, tick); /* Return 0, or the status of the first failure */ return status; } /* * __twsi_i2c_read() - Read data from a I2C chip. * * This function begins a I2C write transaction, and transmits the address * bytes; then begins a I2C read transaction, and receives the data bytes. * * 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. * * @twsi: The MVTWSI register structure to use. * @chip: The chip address to read from. * @addr: The address bytes to send. * @alen: The length of the address bytes in bytes. * @data: The buffer to receive the data read from the chip (has to have * a size of at least 'length' bytes). * @length: The amount of data to be read from the chip in bytes. * @tick: The duration of a clock cycle at the current I2C speed. * Return: Zero if the operation succeeded, or a non-zero code if a time out or * unexpected I2C status occurred. */ static int __twsi_i2c_read(struct mvtwsi_registers *twsi, uchar chip, u8 *addr, int alen, uchar *data, int length, uint tick) { int status = 0; int stop_status; int expected_start = MVTWSI_STATUS_START; if (alen > 0) { /* Begin i2c write to send the address bytes */ status = i2c_begin(twsi, expected_start, (chip << 1), tick); /* Send address bytes */ while ((status == 0) && alen--) status = twsi_send(twsi, addr[alen], MVTWSI_STATUS_DATA_W_ACK, tick); /* Send repeated STARTs after the initial START */ expected_start = MVTWSI_STATUS_REPEATED_START; } /* Begin i2c read to receive data bytes */ if (status == 0) status = i2c_begin(twsi, expected_start, (chip << 1) | 1, tick); /* Receive actual data bytes; set NAK if we if we have nothing more to * read */ while ((status == 0) && length--) status = twsi_recv(twsi, data++, length > 0 ? MVTWSI_READ_ACK : MVTWSI_READ_NAK, tick); /* Stop transaction */ stop_status = twsi_stop(twsi, tick); /* Return 0, or the status of the first failure */ return status != 0 ? status : stop_status; } /* * __twsi_i2c_write() - Send data to a I2C chip. * * This function begins a I2C write transaction, and transmits the address * bytes; then begins a new I2C write transaction, and sends the data bytes. * * @twsi: The MVTWSI register structure to use. * @chip: The chip address to read from. * @addr: The address bytes to send. * @alen: The length of the address bytes in bytes. * @data: The buffer containing the data to be sent to the chip. * @length: The length of data to be sent to the chip in bytes. * @tick: The duration of a clock cycle at the current I2C speed. * Return: Zero if the operation succeeded, or a non-zero code if a time out or * unexpected I2C status occurred. */ static int __twsi_i2c_write(struct mvtwsi_registers *twsi, uchar chip, u8 *addr, int alen, uchar *data, int length, uint tick) { int status, stop_status; /* Begin i2c write to send first the address bytes, then the * data bytes */ status = i2c_begin(twsi, MVTWSI_STATUS_START, (chip << 1), tick); /* Send address bytes */ while ((status == 0) && (alen-- > 0)) status = twsi_send(twsi, addr[alen], MVTWSI_STATUS_DATA_W_ACK, tick); /* Send data bytes */ while ((status == 0) && (length-- > 0)) status = twsi_send(twsi, *(data++), MVTWSI_STATUS_DATA_W_ACK, tick); /* Stop transaction */ stop_status = twsi_stop(twsi, tick); /* Return 0, or the status of the first failure */ return status != 0 ? status : stop_status; } #if !CONFIG_IS_ENABLED(DM_I2C) static void twsi_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd) { struct mvtwsi_registers *twsi = twsi_get_base(adap); __twsi_i2c_init(twsi, speed, slaveadd, NULL); } static uint twsi_i2c_set_bus_speed(struct i2c_adapter *adap, uint requested_speed) { struct mvtwsi_registers *twsi = twsi_get_base(adap); __twsi_i2c_set_bus_speed(twsi, requested_speed); return 0; } static int twsi_i2c_probe(struct i2c_adapter *adap, uchar chip) { struct mvtwsi_registers *twsi = twsi_get_base(adap); return __twsi_i2c_probe_chip(twsi, chip, 10000); } static int twsi_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr, int alen, uchar *data, int length) { struct mvtwsi_registers *twsi = twsi_get_base(adap); 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 __twsi_i2c_read(twsi, chip, addr_bytes, alen, data, length, 10000); } static int twsi_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr, int alen, uchar *data, int length) { struct mvtwsi_registers *twsi = twsi_get_base(adap); 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 __twsi_i2c_write(twsi, chip, addr_bytes, alen, data, length, 10000); } #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 #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 #else /* CONFIG_DM_I2C */ static int mvtwsi_i2c_probe_chip(struct udevice *bus, u32 chip_addr, u32 chip_flags) { struct mvtwsi_i2c_dev *dev = dev_get_priv(bus); return __twsi_i2c_probe_chip(dev->base, chip_addr, dev->tick); } static int mvtwsi_i2c_set_bus_speed(struct udevice *bus, uint speed) { struct mvtwsi_i2c_dev *dev = dev_get_priv(bus); dev->speed = __twsi_i2c_set_bus_speed(dev->base, speed); dev->tick = calc_tick(dev->speed); return 0; } static int mvtwsi_i2c_of_to_plat(struct udevice *bus) { struct mvtwsi_i2c_dev *dev = dev_get_priv(bus); dev->base = dev_read_addr_ptr(bus); if (!dev->base) return -ENOMEM; dev->index = fdtdec_get_int(gd->fdt_blob, dev_of_offset(bus), "cell-index", -1); dev->slaveadd = fdtdec_get_int(gd->fdt_blob, dev_of_offset(bus), "u-boot,i2c-slave-addr", 0x0); dev->speed = dev_read_u32_default(bus, "clock-frequency", I2C_SPEED_STANDARD_RATE); return 0; } static void twsi_disable_i2c_slave(struct mvtwsi_registers *twsi) { clrbits_le32(&twsi->debug, BIT(18)); } static int mvtwsi_i2c_bind(struct udevice *bus) { struct mvtwsi_registers *twsi = dev_read_addr_ptr(bus); /* Disable the hidden slave in i2c0 of these platforms */ if ((IS_ENABLED(CONFIG_ARMADA_38X) || IS_ENABLED(CONFIG_ARCH_KIRKWOOD) || IS_ENABLED(CONFIG_ARMADA_8K)) && !dev_seq(bus)) twsi_disable_i2c_slave(twsi); return 0; } static int mvtwsi_i2c_probe(struct udevice *bus) { struct mvtwsi_i2c_dev *dev = dev_get_priv(bus); struct reset_ctl reset; struct clk clk; uint actual_speed; int ret; ret = reset_get_by_index(bus, 0, &reset); if (!ret) reset_deassert(&reset); ret = clk_get_by_index(bus, 0, &clk); if (!ret) clk_enable(&clk); __twsi_i2c_init(dev->base, dev->speed, dev->slaveadd, &actual_speed); dev->speed = actual_speed; dev->tick = calc_tick(dev->speed); return 0; } static int mvtwsi_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs) { struct mvtwsi_i2c_dev *dev = dev_get_priv(bus); struct i2c_msg *dmsg, *omsg, dummy; u8 *addr_buf_ptr; u8 addr_buf[4]; int i; 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; /* We need to swap the register address if its size is > 1 */ addr_buf_ptr = &addr_buf[0]; for (i = omsg->len; i > 0; i--) *addr_buf_ptr++ = omsg->buf[i - 1]; if (dmsg->flags & I2C_M_RD) return __twsi_i2c_read(dev->base, dmsg->addr, addr_buf, omsg->len, dmsg->buf, dmsg->len, dev->tick); else return __twsi_i2c_write(dev->base, dmsg->addr, addr_buf, omsg->len, dmsg->buf, dmsg->len, dev->tick); } static const struct dm_i2c_ops mvtwsi_i2c_ops = { .xfer = mvtwsi_i2c_xfer, .probe_chip = mvtwsi_i2c_probe_chip, .set_bus_speed = mvtwsi_i2c_set_bus_speed, }; static const struct udevice_id mvtwsi_i2c_ids[] = { { .compatible = "marvell,mv64xxx-i2c", }, { .compatible = "marvell,mv78230-i2c", }, { .compatible = "allwinner,sun4i-a10-i2c", }, { .compatible = "allwinner,sun6i-a31-i2c", }, { /* sentinel */ } }; U_BOOT_DRIVER(i2c_mvtwsi) = { .name = "i2c_mvtwsi", .id = UCLASS_I2C, .of_match = mvtwsi_i2c_ids, .bind = mvtwsi_i2c_bind, .probe = mvtwsi_i2c_probe, .of_to_plat = mvtwsi_i2c_of_to_plat, .priv_auto = sizeof(struct mvtwsi_i2c_dev), .ops = &mvtwsi_i2c_ops, }; #endif /* CONFIG_DM_I2C */