Signed-off-by: Tim Harvey tharvey@gateworks.com --- configs/thunderx_81xx_defconfig | 2 + drivers/i2c/Kconfig | 7 + drivers/i2c/Makefile | 1 + drivers/i2c/thunderx_i2c.c | 878 ++++++++++++++++++++++++++++++++ include/configs/thunderx_81xx.h | 2 + 5 files changed, 890 insertions(+) create mode 100644 drivers/i2c/thunderx_i2c.c
diff --git a/configs/thunderx_81xx_defconfig b/configs/thunderx_81xx_defconfig index d07b0e5804..e43aa9750d 100644 --- a/configs/thunderx_81xx_defconfig +++ b/configs/thunderx_81xx_defconfig @@ -22,11 +22,13 @@ CONFIG_SYS_PROMPT="ThunderX_81XX> " # CONFIG_CMD_ENV_EXISTS is not set # CONFIG_CMD_FLASH is not set CONFIG_CMD_GPIO=y +CONFIG_CMD_I2C=y CONFIG_CMD_PCI=y # CONFIG_CMD_NET is not set CONFIG_DEFAULT_DEVICE_TREE="thunderx-81xx" CONFIG_DM=y CONFIG_DM_GPIO=y +CONFIG_DM_I2C=y CONFIG_LED=y CONFIG_LED_GPIO=y # CONFIG_MMC is not set diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig index 1ef22e6bcd..0424b54eb4 100644 --- a/drivers/i2c/Kconfig +++ b/drivers/i2c/Kconfig @@ -374,6 +374,13 @@ config SYS_I2C_SANDBOX bus. Devices can be attached to the bus using the device tree which specifies the driver to use. See sandbox.dts as an example.
+config SYS_I2C_THUNDERX + bool "ThunderX i2c driver" + depends on ARCH_THUNDERX && DM_I2C + default y + help + Enable I2C support for Cavium ThunderX line of processors. + config SYS_I2C_S3C24X0 bool "Samsung I2C driver" depends on ARCH_EXYNOS4 && DM_I2C diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index d3637bcd8d..27087f1814 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -34,6 +34,7 @@ obj-$(CONFIG_SYS_I2C_SH) += sh_i2c.o obj-$(CONFIG_SYS_I2C_SOFT) += soft_i2c.o obj-$(CONFIG_SYS_I2C_STM32F7) += stm32f7_i2c.o obj-$(CONFIG_SYS_I2C_TEGRA) += tegra_i2c.o +obj-$(CONFIG_SYS_I2C_THUNDERX) += thunderx_i2c.o obj-$(CONFIG_SYS_I2C_UNIPHIER) += i2c-uniphier.o obj-$(CONFIG_SYS_I2C_UNIPHIER_F) += i2c-uniphier-f.o obj-$(CONFIG_SYS_I2C_VERSATILE) += i2c-versatile.o diff --git a/drivers/i2c/thunderx_i2c.c b/drivers/i2c/thunderx_i2c.c new file mode 100644 index 0000000000..bac442d3fa --- /dev/null +++ b/drivers/i2c/thunderx_i2c.c @@ -0,0 +1,878 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2018, Cavium Inc. + */ + +#include <common.h> +#include <i2c.h> +#include <dm.h> +#include <asm/io.h> +#include <asm/arch-thunderx/thunderx.h> + +/* + * Slave address to use for Thunder when accessed by another master + */ +#ifndef CONFIG_SYS_I2C_THUNDERX_SLAVE_ADDR +# define CONFIG_SYS_I2C_THUNDERX_SLAVE_ADDR 0x77 +#endif + +#define TWSI_THP 24 + +#define TWSI_SW_TWSI 0x1000 +#define TWSI_TWSI_SW 0x1008 +#define TWSI_INT 0x1010 +#define TWSI_SW_TWSI_EXT 0x1018 + +union twsx_sw_twsi { + u64 u; + struct { + u64 data:32; + u64 eop_ia:3; + u64 ia:5; + u64 addr:10; + u64 scr:2; + u64 size:3; + u64 sovr:1; + u64 r:1; + u64 op:4; + u64 eia:1; + u64 slonly:1; + u64 v:1; + } s; +}; + +union twsx_sw_twsi_ext { + u64 u; + struct { + u64 data:32; + u64 ia:8; + u64 :24; + } s; +}; + +union twsx_int { + u64 u; + struct { + u64 st_int:1; /** TWSX_SW_TWSI register update int */ + u64 ts_int:1; /** TWSX_TWSI_SW register update int */ + u64 core_int:1; /** TWSI core interrupt, ignored for HLC */ + u64 :5; /** Reserved */ + u64 sda_ovr:1; /** SDA testing override */ + u64 scl_ovr:1; /** SCL testing override */ + u64 sda:1; /** SDA signal */ + u64 scl:1; /** SCL signal */ + u64 :52; /** Reserved */ + } s; +}; + +enum { + TWSI_OP_WRITE = 0, + TWSI_OP_READ = 1, +}; + +enum { + TWSI_EOP_SLAVE_ADDR = 0, + TWSI_EOP_CLK_CTL = 3, + TWSI_SW_EOP_IA = 6, +}; + +enum { + TWSI_SLAVEADD = 0, + TWSI_DATA = 1, + TWSI_CTL = 2, + TWSI_CLKCTL = 3, + TWSI_STAT = 3, + TWSI_SLAVEADD_EXT = 4, + TWSI_RST = 7, +}; + +enum { + TWSI_CTL_AAK = BIT(2), + TWSI_CTL_IFLG = BIT(3), + TWSI_CTL_STP = BIT(4), + TWSI_CTL_STA = BIT(5), + TWSI_CTL_ENAB = BIT(6), + TWSI_CTL_CE = BIT(7), +}; + +enum { + /** Bus error */ + TWSI_STAT_BUS_ERROR = 0x00, + /** Start condition transmitted */ + TWSI_STAT_START = 0x08, + /** Repeat start condition transmitted */ + TWSI_STAT_RSTART = 0x10, + /** Address + write bit transmitted, ACK received */ + TWSI_STAT_TXADDR_ACK = 0x18, + /** Address + write bit transmitted, /ACK received */ + TWSI_STAT_TXADDR_NAK = 0x20, + /** Data byte transmitted in master mode, ACK received */ + TWSI_STAT_TXDATA_ACK = 0x28, + /** Data byte transmitted in master mode, ACK received */ + TWSI_STAT_TXDATA_NAK = 0x30, + /** Arbitration lost in address or data byte */ + TWSI_STAT_TX_ARB_LOST = 0x38, + /** Address + read bit transmitted, ACK received */ + TWSI_STAT_RXADDR_ACK = 0x40, + /** Address + read bit transmitted, /ACK received */ + TWSI_STAT_RXADDR_NAK = 0x48, + /** Data byte received in master mode, ACK transmitted */ + TWSI_STAT_RXDATA_ACK_SENT = 0x50, + /** Data byte received, NACK transmitted */ + TWSI_STAT_RXDATA_NAK_SENT = 0x58, + /** Slave address received, sent ACK */ + TWSI_STAT_SLAVE_RXADDR_ACK = 0x60, + /** + * Arbitration lost in address as master, slave address + write bit + * received, ACK transmitted + */ + TWSI_STAT_TX_ACK_ARB_LOST = 0x68, + /** General call address received, ACK transmitted */ + TWSI_STAT_RX_GEN_ADDR_ACK = 0x70, + /** + * Arbitration lost in address as master, general call address + * received, ACK transmitted + */ + TWSI_STAT_RX_GEN_ADDR_ARB_LOST = 0x78, + /** Data byte received after slave address received, ACK transmitted */ + TWSI_STAT_SLAVE_RXDATA_ACK = 0x80, + /** Data byte received after slave address received, /ACK transmitted */ + TWSI_STAT_SLAVE_RXDATA_NAK = 0x88, + /** + * Data byte received after general call address received, ACK + * transmitted + */ + TWSI_STAT_GEN_RXADDR_ACK = 0x90, + /** + * Data byte received after general call address received, /ACK + * transmitted + */ + TWSI_STAT_GEN_RXADDR_NAK = 0x98, + /** STOP or repeated START condition received in slave mode */ + TWSI_STAT_STOP_MULTI_START = 0xA0, + /** Slave address + read bit received, ACK transmitted */ + TWSI_STAT_SLAVE_RXADDR2_ACK = 0xA8, + /** + * Arbitration lost in address as master, slave address + read bit + * received, ACK transmitted + */ + TWSI_STAT_RXDATA_ACK_ARB_LOST = 0xB0, + /** Data byte transmitted in slave mode, ACK received */ + TWSI_STAT_SLAVE_TXDATA_ACK = 0xB8, + /** Data byte transmitted in slave mode, /ACK received */ + TWSI_STAT_SLAVE_TXDATA_NAK = 0xC0, + /** Last byte transmitted in slave mode, ACK received */ + TWSI_STAT_SLAVE_TXDATA_END_ACK = 0xC8, + /** Second address byte + write bit transmitted, ACK received */ + TWSI_STAT_TXADDR2DATA_ACK = 0xD0, + /** Second address byte + write bit transmitted, /ACK received */ + TWSI_STAT_TXADDR2DATA_NAK = 0xD8, + /** No relevant status information */ + TWSI_STAT_IDLE = 0xF8 +}; + +struct thunderx_twsi { + int id; + int speed; + void *baseaddr; +}; + +/** Last i2c id assigned */ +static int last_id = 0; + +static void twsi_unblock(void *baseaddr); +static int twsi_stop(void *baseaddr); + + +/** + * Converts the i2c status to a meaningful string + * + * @param status status to convert + * + * @return string representation of the status + */ +static const char *twsi_i2c_status_str(uint8_t status) +{ + switch (status) { + case TWSI_STAT_BUS_ERROR: + return "Bus error"; + case TWSI_STAT_START: + return "START condition transmitted"; + case TWSI_STAT_RSTART: + return "Repeated START condition transmitted"; + case TWSI_STAT_TXADDR_ACK: + return "Address + write bit transmitted, ACK received"; + case TWSI_STAT_TXADDR_NAK: + return "Address + write bit transmitted, NAK received"; + case TWSI_STAT_TXDATA_ACK: + return "Data byte transmitted in master mode, ACK received"; + case TWSI_STAT_TXDATA_NAK: + return "Data byte transmitted in master mode, NAK received"; + case TWSI_STAT_TX_ARB_LOST: + return "Arbitration lost in address or data byte"; + case TWSI_STAT_RXADDR_ACK: + return "Address + read bit transmitted, ACK received"; + case TWSI_STAT_RXADDR_NAK: + return "Address + read bit transmitted, NAK received"; + case TWSI_STAT_RXDATA_ACK_SENT: + return "Data byte received in master mode, ACK transmitted"; + case TWSI_STAT_RXDATA_NAK_SENT: + return "Data byte received in master mode, NAK transmitted"; + case TWSI_STAT_SLAVE_RXADDR_ACK: + return "Slave address + write bit received, ACK transmitted"; + case TWSI_STAT_TX_ACK_ARB_LOST: + return "Arbitration lost in address as master, slave address + write bit received, ACK transmitted"; + case TWSI_STAT_RX_GEN_ADDR_ACK: + return "General call address received, ACK transmitted"; + case TWSI_STAT_RX_GEN_ADDR_ARB_LOST: + return "Arbitration lost in address as master, general call address received, ACK transmitted"; + case TWSI_STAT_SLAVE_RXDATA_ACK: + return "Data byte received after slave address received, ACK transmitted"; + case TWSI_STAT_SLAVE_RXDATA_NAK: + return "Data byte received after slave address received, NAK transmitted"; + case TWSI_STAT_GEN_RXADDR_ACK: + return "Data byte received after general call address received, ACK transmitted"; + case TWSI_STAT_GEN_RXADDR_NAK: + return "Data byte received after general call address received, NAK transmitted"; + case TWSI_STAT_STOP_MULTI_START: + return "STOP or repeated START condition received in slave mode"; + case TWSI_STAT_SLAVE_RXADDR2_ACK: + return "Slave address + read bit received, ACK transmitted"; + case TWSI_STAT_RXDATA_ACK_ARB_LOST: + return "Arbitration lost in address as master, slave address + read bit received, ACK transmitted"; + case TWSI_STAT_SLAVE_TXDATA_ACK: + return "Data byte transmitted in slave mode, ACK received"; + case TWSI_STAT_SLAVE_TXDATA_NAK: + return "Data byte transmitted in slave mode, NAK received"; + case TWSI_STAT_SLAVE_TXDATA_END_ACK: + return "Last byte transmitted in slave mode, ACK received"; + case TWSI_STAT_TXADDR2DATA_ACK: + return "Second address byte + write bit transmitted, ACK received"; + case TWSI_STAT_TXADDR2DATA_NAK: + return "Second address byte + write bit transmitted, NAK received"; + case TWSI_STAT_IDLE: + return "Idle"; + default: + return "Unknown status code"; + } +} + +/** + * Returns true if we lost arbitration + * + * @param code status code + * @param final_read true if this is the final read operation + * + * @return true if arbitration has been lost, false if it hasn't been lost. + */ +static int twsi_i2c_lost_arb(u8 code, int final_read) +{ + switch (code) { + /* Arbitration lost */ + case TWSI_STAT_TX_ARB_LOST: + case TWSI_STAT_TX_ACK_ARB_LOST: + case TWSI_STAT_RX_GEN_ADDR_ARB_LOST: + case TWSI_STAT_RXDATA_ACK_ARB_LOST: + return -EAGAIN; + + /* Being addressed as slave, should back off and listen */ + case TWSI_STAT_SLAVE_RXADDR_ACK: + case TWSI_STAT_RX_GEN_ADDR_ACK: + case TWSI_STAT_GEN_RXADDR_ACK: + case TWSI_STAT_GEN_RXADDR_NAK: + return -EIO; + + /* Core busy as slave */ + case TWSI_STAT_SLAVE_RXDATA_ACK: + case TWSI_STAT_SLAVE_RXDATA_NAK: + case TWSI_STAT_STOP_MULTI_START: + case TWSI_STAT_SLAVE_RXADDR2_ACK: + case TWSI_STAT_SLAVE_TXDATA_ACK: + case TWSI_STAT_SLAVE_TXDATA_NAK: + case TWSI_STAT_SLAVE_TXDATA_END_ACK: + return -EIO; + + /* Ack allowed on pre-terminal bytes only */ + case TWSI_STAT_RXDATA_ACK_SENT: + if (!final_read) + return 0; + return -EAGAIN; + + /* NAK allowed on terminal byte only */ + case TWSI_STAT_RXDATA_NAK_SENT: + if (!final_read) + return 0; + return -EAGAIN; + + case TWSI_STAT_TXDATA_NAK: + case TWSI_STAT_TXADDR_NAK: + case TWSI_STAT_RXADDR_NAK: + case TWSI_STAT_TXADDR2DATA_NAK: + return -EAGAIN; + } + return 0; +} + +/** + * Writes to the MIO_TWS(0..5)_SW_TWSI register + * + * @param baseaddr Base address of i2c registers + * @param sw_twsi value to write + * + * @return 0 for success, otherwise error + */ +static u64 twsi_write_sw(void *baseaddr, union twsx_sw_twsi sw_twsi) +{ + unsigned long start = get_timer(0); + + sw_twsi.s.r = 0; + sw_twsi.s.v = 1; + + debug("%s(%p, 0x%llx)\n", __func__, baseaddr, sw_twsi.u); + writeq(sw_twsi.u, baseaddr + TWSI_SW_TWSI); + do { + sw_twsi.u = readq(baseaddr + TWSI_SW_TWSI); + } while (sw_twsi.s.v != 0 && get_timer(start) < 50); + + if (sw_twsi.s.v) + debug("%s: timed out\n", __func__); + return sw_twsi.u; +} + +/** + * Reads the MIO_TWS(0..5)_SW_TWSI register + * + * @param baseaddr Base address of i2c registers + * @param sw_twsi value for eia and op, etc. to read + * + * @return value of the register + */ +static u64 twsi_read_sw(void *baseaddr, union twsx_sw_twsi sw_twsi) +{ + unsigned long start = get_timer(0); + sw_twsi.s.r = 1; + sw_twsi.s.v = 1; + + debug("%s(%p, 0x%llx)\n", __func__, baseaddr, sw_twsi.u); + writeq(sw_twsi.u, baseaddr + TWSI_SW_TWSI); + + do { + sw_twsi.u = readq(baseaddr + TWSI_SW_TWSI); + } while (sw_twsi.s.v != 0 && get_timer(start) < 50); + + if (sw_twsi.s.v) + debug("%s: Error writing 0x%llx\n", __func__, sw_twsi.u); + + debug("%s: Returning 0x%llx\n", __func__, sw_twsi.u); + return sw_twsi.u; +} + +/** + * Write control register + * + * @param baseaddr Base address for i2c registers + * @param data data to write + */ +static void twsi_write_ctl(void *baseaddr, u8 data) +{ + union twsx_sw_twsi twsi_sw; + + debug("%s(%p, 0x%x)\n", __func__, baseaddr, data); + twsi_sw.u = 0; + + twsi_sw.s.op = TWSI_SW_EOP_IA; + twsi_sw.s.eop_ia = TWSI_CTL; + twsi_sw.s.data = data; + + twsi_write_sw(baseaddr, twsi_sw); +} + +/** + * Reads the TWSI Control Register + * + * @param[in] baseaddr Base address for i2c + * + * @return 8-bit TWSI control register + */ +static u32 twsi_read_ctl(void *baseaddr) +{ + union twsx_sw_twsi sw_twsi; + + sw_twsi.u = 0; + sw_twsi.s.op = TWSI_SW_EOP_IA; + sw_twsi.s.eop_ia = TWSI_CTL; + + sw_twsi.u = twsi_read_sw(baseaddr, sw_twsi); + debug("%s(%p): 0x%x\n", __func__, baseaddr, sw_twsi.s.data); + return sw_twsi.s.data; +} + +/** + * Read i2c status register + * + * @param baseaddr Base address of i2c registers + * + * @return value of status register + */ +static u8 twsi_read_status(void *baseaddr) +{ + union twsx_sw_twsi twsi_sw; + + twsi_sw.u = 0; + twsi_sw.s.op = TWSI_SW_EOP_IA; + twsi_sw.s.eop_ia = TWSI_STAT; + + return twsi_read_sw(baseaddr, twsi_sw); +} + +/** + * Waits for an i2c operation to complete + * + * @param baseaddr Base address of registers + * + * @return 0 for success, 1 if timeout + */ +static int twsi_wait(void *baseaddr) +{ + unsigned long start = get_timer(0); + u8 twsi_ctl; + + debug("%s(%p)\n", __func__, baseaddr); + do { + twsi_ctl = twsi_read_ctl(baseaddr); + twsi_ctl &= TWSI_CTL_IFLG; + } while (!twsi_ctl && get_timer(start) < 50); + + debug(" return: %u\n", !twsi_ctl); + return !twsi_ctl; +} + +/** + * Unsticks the i2c bus + * + * @param baseaddr base address of registers + */ +static int twsi_start_unstick(void *baseaddr) +{ + twsi_stop(baseaddr); + + twsi_unblock(baseaddr); + + return 0; +} + +/** + * Sends an i2c start condition + * + * @param baseaddr base address of registers + * + * @return 0 for success, otherwise error + */ +static int twsi_start(void *baseaddr) +{ + int result; + u8 stat; + + debug("%s(%p)\n", __func__, baseaddr); + twsi_write_ctl(baseaddr, TWSI_CTL_STA | TWSI_CTL_ENAB); + result = twsi_wait(baseaddr); + if (result) { + stat = twsi_read_status(baseaddr); + debug("%s: result: 0x%x, status: 0x%x\n", __func__, + result, stat); + switch (stat) { + case TWSI_STAT_START: + case TWSI_STAT_RSTART: + return 0; + case TWSI_STAT_RXADDR_ACK: + default: + return twsi_start_unstick(baseaddr); + } + } + debug("%s: success\n", __func__); + return 0; +} + +/** + * Sends an i2c stop condition + * + * @param baseaddr register base address + * + * @return 0 for success, -1 if error + */ +static int twsi_stop(void *baseaddr) +{ + u8 stat; + twsi_write_ctl(baseaddr, TWSI_CTL_STP | TWSI_CTL_ENAB); + + stat = twsi_read_status(baseaddr); + if (stat != TWSI_STAT_IDLE) { + debug("%s: Bad status on bus@%p\n", __func__, baseaddr); + return -1; + } + return 0; +} + +/** + * Writes data to the i2c bus + * + * @param baseraddr register base address + * @param slave_addr address of slave to write to + * @param buffer Pointer to buffer to write + * @param length Number of bytes in buffer to write + * + * @return 0 for success, otherwise error + */ +static int twsi_write_data(void *baseaddr, u8 slave_addr, + u8 *buffer, unsigned int length) +{ + union twsx_sw_twsi twsi_sw; + unsigned int curr = 0; + int result; + + debug("%s(%p, 0x%x, %p, 0x%x)\n", __func__, baseaddr, slave_addr, + buffer, length); + result = twsi_start(baseaddr); + if (result) { + debug("%s: Could not start BUS transaction\n", __func__); + return -1; + } + + result = twsi_wait(baseaddr); + if (result) { + debug("%s: wait failed\n", __func__); + return result; + } + + twsi_sw.u = 0; + twsi_sw.s.op = TWSI_SW_EOP_IA; + twsi_sw.s.eop_ia = TWSI_DATA; + twsi_sw.s.data = (u32) (slave_addr << 1) | TWSI_OP_WRITE; + + twsi_write_sw(baseaddr, twsi_sw); + twsi_write_ctl(baseaddr, TWSI_CTL_ENAB); + + debug("%s: Waiting\n", __func__); + result = twsi_wait(baseaddr); + if (result) { + debug("%s: Timed out writing slave address 0x%x to target\n", + __func__, slave_addr); + return result; + } + result = twsi_read_status(baseaddr); + debug("%s: status: (%d) %s\n", __func__, result, + twsi_i2c_status_str(result)); + if ((result = twsi_read_status(baseaddr)) != TWSI_STAT_TXADDR_ACK) { + debug("%s: status: (%d) %s\n", __func__, result, + twsi_i2c_status_str(result)); + twsi_stop(baseaddr); + return twsi_i2c_lost_arb(result, 0); + } + + while (curr < length) { + twsi_sw.u = 0; + twsi_sw.s.op = TWSI_SW_EOP_IA; + twsi_sw.s.eop_ia = TWSI_DATA; + twsi_sw.s.data = buffer[curr++]; + + twsi_write_sw(baseaddr, twsi_sw); + twsi_write_ctl(baseaddr, TWSI_CTL_ENAB); + + debug("%s: Writing 0x%x\n", __func__, twsi_sw.s.data); + + result = twsi_wait(baseaddr); + if (result) { + debug("%s: Timed out writing data to 0x%x\n", + __func__, slave_addr); + return result; + } + result = twsi_read_status(baseaddr); + debug("%s: status: (%d) %s\n", __func__, result, + twsi_i2c_status_str(result)); + } + + debug("%s: Stopping\n", __func__); + return twsi_stop(baseaddr); +} + +/** + * Manually clear the I2C bus and send a stop + */ +static void twsi_unblock(void *baseaddr) +{ + int i; + union twsx_int int_reg; + + int_reg.u = 0; + for (i = 0; i < 9; i++) { + int_reg.s.scl_ovr = 0; + writeq(int_reg.u, baseaddr + TWSI_INT); + udelay(5); + int_reg.s.scl_ovr = 1; + writeq(int_reg.u, baseaddr + TWSI_INT); + udelay(5); + } + int_reg.s.sda_ovr = 1; + writeq(int_reg.u, baseaddr + TWSI_INT); + udelay(5); + int_reg.s.scl_ovr = 0; + writeq(int_reg.u, baseaddr + TWSI_INT); + udelay(5); + int_reg.u = 0; + writeq(int_reg.u, baseaddr + TWSI_INT); + udelay(5); +} + +/** + * Performs a read transaction on the i2c bus + * + * @param baseaddr Base address of twsi registers + * @param slave_addr i2c bus address to read from + * @param buffer buffer to read into + * @param length number of bytes to read + * + * @return 0 for success, otherwise error + */ +static int twsi_read_data(void *baseaddr, u8 slave_addr, + u8 *buffer, unsigned int length) +{ + union twsx_sw_twsi twsi_sw; + unsigned int curr = 0; + int result; + + debug("%s(%p, 0x%x, %p, %u)\n", __func__, baseaddr, slave_addr, + buffer, length); + result = twsi_start(baseaddr); + if (result) { + debug("%s: start failed\n", __func__); + return result; + } + + result = twsi_wait(baseaddr); + if (result) { + debug("%s: wait failed\n", __func__); + return result; + } + + twsi_sw.u = 0; + twsi_sw.s.op = TWSI_SW_EOP_IA; + twsi_sw.s.eop_ia = TWSI_DATA; + + twsi_sw.s.data = (u32) (slave_addr << 1) | TWSI_OP_READ; + + twsi_write_sw(baseaddr, twsi_sw); + twsi_write_ctl(baseaddr, TWSI_CTL_ENAB); + + result = twsi_wait(baseaddr); + if (result) { + debug("%s: waiting for sending addr failed\n", __func__); + return result; + } + + result = twsi_read_status(baseaddr); + debug("%s: status: (%d) %s\n", __func__, result, + twsi_i2c_status_str(result)); + if (result != TWSI_STAT_RXADDR_ACK) { + debug("%s: status: (%d) %s\n", __func__, result, + twsi_i2c_status_str(result)); + twsi_stop(baseaddr); + return twsi_i2c_lost_arb(result, 0); + } + + while (curr < length) { + twsi_write_ctl(baseaddr, TWSI_CTL_ENAB | + ((curr < length - 1) ? TWSI_CTL_AAK : 0)); + + result = twsi_wait(baseaddr); + if (result) { + debug("%s: waiting for data failed\n", __func__); + return result; + } + + twsi_sw.u = twsi_read_sw(baseaddr, twsi_sw); + buffer[curr++] = twsi_sw.s.data; + } + + twsi_stop(baseaddr); + + return 0; +} + +static int twsi_init(void *baseaddr, unsigned int speed, int slaveaddr) +{ + int io_clock_hz; + int n_div; + int m_div; + union twsx_sw_twsi sw_twsi; + + debug("%s(%p, %u, 0x%x)\n", __func__, baseaddr, speed, slaveaddr); + io_clock_hz = thunderx_get_io_clock(); + + /* Set the TWSI clock to a conservative TWSI_BUS_FREQ. Compute the + * clocks M divider based on the SCLK. + * TWSI freq = (core freq) / (20 x (M+1) x (thp+1) x 2^N) + * M = ((core freq) / (20 x (TWSI freq) x (thp+1) x 2^N)) - 1 + */ + for (n_div = 0; n_div < 8; n_div++) { + m_div = io_clock_hz / (20 * speed * (TWSI_THP + 1)); + m_div /= 1 << n_div; + m_div -= 1; + if (m_div < 16) + break; + } + if (m_div >= 16) + return -1; + + sw_twsi.u = 0; + sw_twsi.s.v = 1; /* Clear valid bit */ + sw_twsi.s.op = 0x6; /* See EOP field */ + sw_twsi.s.r = 0; /* Select CLKCTL when R = 0 */ + sw_twsi.s.eop_ia = 3; /* R=0 selects CLKCTL, R=1 selects STAT */ + sw_twsi.s.data = ((m_div & 0xf) << 3) | ((n_div & 0x7) << 0); + + twsi_write_sw(baseaddr, sw_twsi); + /* Only init non-slave ports */ + debug("%s: Writing 0x%llx to sw_twsi, m_div: 0x%x, n_div: 0x%x\n", + __func__, sw_twsi.u, m_div, n_div); + + + sw_twsi.u = 0; + sw_twsi.s.v = 1; + sw_twsi.s.op = TWSI_SW_EOP_IA; + sw_twsi.s.r = 0; + sw_twsi.s.eop_ia = 0; + sw_twsi.s.data = slaveaddr << 1; + + twsi_write_sw(baseaddr, sw_twsi); + + /* Set slave address */ + sw_twsi.u = 0; + sw_twsi.s.v = 1; + sw_twsi.s.op = TWSI_SW_EOP_IA; + sw_twsi.s.r = 0; + sw_twsi.s.eop_ia = TWSI_EOP_SLAVE_ADDR; + sw_twsi.s.data = slaveaddr; + twsi_write_sw(baseaddr, sw_twsi); + + return 0; +} + +/** + * Transfers data over the i2c bus + * + * @param bus i2c bus to transfer data over + * @param msg Array of i2c messages + * @param nmsgs Number of messages to send/receive + * + * @return 0 for success, otherwise error + */ +static int thunderx_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, + int nmsgs) +{ + struct thunderx_twsi *twsi = dev_get_priv(bus); + int result; + + debug("thunderx_i2c_xfer: %d messages\n", nmsgs); + for (; nmsgs > 0; nmsgs--, msg++) { + debug("thunderx_i2c_xfer: chip=0x%x, len=0x%x\n", + msg->addr, msg->len); + if (msg->flags & I2C_M_RD) { + debug("%s: Reading data\n", __func__); + result = twsi_read_data(twsi->baseaddr, msg->addr, + msg->buf, msg->len); + } else { + debug("%s: Writing data\n", __func__); + result = twsi_write_data(twsi->baseaddr, msg->addr, + msg->buf, msg->len); + } + if (result) { + debug("thunderx_i2c_xfer: error sending\n"); + return -EREMOTEIO; + } + } + + return 0; +} + +static int thunderx_i2c_set_bus_speed(struct udevice *bus, unsigned int speed) +{ + struct thunderx_twsi *twsi = dev_get_priv(bus); + int m_div, n_div; + unsigned io_clock_hz; + union twsx_sw_twsi sw_twsi; + void *baseaddr = twsi->baseaddr; + + io_clock_hz = thunderx_get_io_clock(); + debug("%s(%p, %u) io clock: %u\n", __func__, bus, speed, io_clock_hz); + + /* Set the TWSI clock to a conservative TWSI_BUS_FREQ. Compute the + * clocks M divider based on the SCLK. + * TWSI freq = (core freq) / (20 x (M+1) x (thp+1) x 2^N) + * M = ((core freq) / (20 x (TWSI freq) x (thp+1) x 2^N)) - 1 */ + for (n_div = 0; n_div < 8; n_div++) { + m_div = io_clock_hz / (20 * speed * (TWSI_THP + 1)); + m_div /= 1 << n_div; + m_div -= 1; + if (m_div < 16) + break; + } + if (m_div >= 16) + return -1; + + sw_twsi.u = 0; + sw_twsi.s.v = 1; /* Clear valid bit */ + sw_twsi.s.op = TWSI_SW_EOP_IA; /* See EOP field */ + sw_twsi.s.r = 0; /* Select CLKCTL when R = 0 */ + sw_twsi.s.eop_ia = TWSI_CLKCTL; /* R=0 selects CLKCTL, R=1 selects STAT */ + sw_twsi.s.data = ((m_div & 0xf) << 3) | ((n_div & 0x7) << 0); + + /* Only init non-slave ports */ + writeq(sw_twsi.u, baseaddr + TWSI_SW_TWSI); + + debug("%s: Wrote 0x%llx to sw_twsi\n", __func__, sw_twsi.u); + return 0; +} + +static int thunderx_pci_i2c_probe(struct udevice *dev) +{ + struct thunderx_twsi *twsi = dev_get_priv(dev); + size_t size; + pci_dev_t bdf = dm_pci_get_bdf(dev); + + debug("TWSI PCI device: %x\n", bdf); + dev->req_seq = PCI_FUNC(bdf); + + twsi->baseaddr = dm_pci_map_bar(dev, 0, &size, PCI_REGION_MEM); + twsi->id = last_id++; + + debug("TWSI bus %d at %p\n",dev->seq, twsi->baseaddr); + + return twsi_init(twsi->baseaddr, CONFIG_SYS_I2C_SPEED, + CONFIG_SYS_I2C_THUNDERX_SLAVE_ADDR); +} + +static const struct dm_i2c_ops thunderx_i2c_ops = { + .xfer = thunderx_i2c_xfer, + .set_bus_speed = thunderx_i2c_set_bus_speed, +}; + +static const struct udevice_id thunderx_i2c_ids[] = { + { .compatible = "cavium,thunder-8890-twsi" }, + { } +}; + +U_BOOT_DRIVER(thunderx_pci_twsi) = { + .name = "i2c_thunderx", + .id = UCLASS_I2C, + .of_match = thunderx_i2c_ids, + .probe = thunderx_pci_i2c_probe, + .priv_auto_alloc_size = sizeof(struct thunderx_twsi), + .ops = &thunderx_i2c_ops, +}; + +static struct pci_device_id thunderx_pci_twsi_supported[] = { + { PCI_VDEVICE(CAVIUM, PCI_DEVICE_ID_THUNDERX_TWSI) }, + { }, +}; + +U_BOOT_PCI_DEVICE(thunderx_pci_twsi, thunderx_pci_twsi_supported); diff --git a/include/configs/thunderx_81xx.h b/include/configs/thunderx_81xx.h index 10c4a89232..7a2c0adde2 100644 --- a/include/configs/thunderx_81xx.h +++ b/include/configs/thunderx_81xx.h @@ -68,4 +68,6 @@ #define PLL_REF_CLK 50000000 /* 50 MHz */ #define NS_PER_REF_CLK_TICK (1000000000/PLL_REF_CLK)
+#define CONFIG_SYS_I2C_SPEED 100000 + #endif /* __THUNDERX_81XX_H__ */