[PATCH v1] i2c: octeon_i2c: Add I2C controller driver for Octeon
Stefan Roese
sr at denx.de
Wed Jun 3 07:20:06 CEST 2020
Hi Rayagonda,
v1 is superseeded. Please review the latest version, v2:
https://patchwork.ozlabs.org/project/uboot/patch/20200526121307.2735-1-sr@denx.de/
Thanks,
Stefan
On 03.06.20 07:15, Rayagonda Kokatanur wrote:
> Hi Stefan,
>
> Few minor comments,
>
> On Thu, May 14, 2020 at 12:53 PM Stefan Roese <sr at denx.de> wrote:
>>
>> From: Suneel Garapati <sgarapati at marvell.com>
>>
>> Add support for I2C controllers found on Octeon II/III and Octeon TX
>> TX2 SoC platforms.
>>
>> Signed-off-by: Aaron Williams <awilliams at marvell.com>
>> Signed-off-by: Suneel Garapati <sgarapati at marvell.com>
>> Signed-off-by: Stefan Roese <sr at denx.de>
>> Cc: Heiko Schocher <hs at denx.de>
>> Cc: Simon Glass <sjg at chromium.org>
>> Cc: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
>> Cc: Aaron Williams <awilliams at marvell.com>
>> Cc: Chandrakala Chavva <cchavva at marvell.com>
>> ---
>> RFC -> v1 (Stefan):
>> - Separated this patch from the OcteonTX/TX2 RFC patch series into a
>> single patch. This is useful, as the upcoming MIPS Octeon support will
>> use this I2C driver.
>> - Added MIPS Octeon II/III support (big endian). Rename driver and its
>> function names from "octeontx" to "octeon" to better match all Octeon
>> platforms.
>> - Moved from union to defines / bitmasks as suggested by Simon. This makes
>> the driver usage on little- and big-endian platforms much easier.
>> - Enhanced Kconfig text
>> - Removed all clock macros (use values from DT)
>> - Removed long driver debug strings. This is only available when a debug
>> version of this driver is built. The user / developer can lookup the
>> descriptive error messages in the driver in this case anyway.
>> - Removed static "last_id"
>> - Dropped misc blank lines. Misc reformatting.
>> - Dropped "!= 0"
>> - Added missing function comments
>> - Added missing strut comments
>> - Changed comment style
>> - Renames "result" to "ret"
>> - Hex numbers uppercase
>> - Minor other changes
>> - Reword commit text and subject
>>
>> drivers/i2c/Kconfig | 10 +
>> drivers/i2c/Makefile | 1 +
>> drivers/i2c/octeon_i2c.c | 803 +++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 814 insertions(+)
>> create mode 100644 drivers/i2c/octeon_i2c.c
>>
>> diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
>> index e42b6516bf..1330b36698 100644
>> --- a/drivers/i2c/Kconfig
>> +++ b/drivers/i2c/Kconfig
>> @@ -374,6 +374,16 @@ 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_OCTEON
>> + bool "Octeon II/III/TX/TX2 I2C driver"
>> + depends on (ARCH_OCTEON || ARCH_OCTEONTX || ARCH_OCTEONTX2) && DM_I2C
>> + default y
>> + help
>> + Add support for the Marvell Octeon I2C driver. This is used with
>> + various Octeon parts such as Octeon II/III and OcteonTX/TX2. All
>> + chips have several I2C ports and all are provided, controlled by
>> + the device tree.
>> +
>> 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 62935b7ebc..2b58aae892 100644
>> --- a/drivers/i2c/Makefile
>> +++ b/drivers/i2c/Makefile
>> @@ -27,6 +27,7 @@ obj-$(CONFIG_SYS_I2C_LPC32XX) += lpc32xx_i2c.o
>> obj-$(CONFIG_SYS_I2C_MESON) += meson_i2c.o
>> obj-$(CONFIG_SYS_I2C_MVTWSI) += mvtwsi.o
>> obj-$(CONFIG_SYS_I2C_MXC) += mxc_i2c.o
>> +obj-$(CONFIG_SYS_I2C_OCTEON) += octeon_i2c.o
>> obj-$(CONFIG_SYS_I2C_OMAP24XX) += omap24xx_i2c.o
>> obj-$(CONFIG_SYS_I2C_RCAR_I2C) += rcar_i2c.o
>> obj-$(CONFIG_SYS_I2C_RCAR_IIC) += rcar_iic.o
>> diff --git a/drivers/i2c/octeon_i2c.c b/drivers/i2c/octeon_i2c.c
>> new file mode 100644
>> index 0000000000..210f98655e
>> --- /dev/null
>> +++ b/drivers/i2c/octeon_i2c.c
>> @@ -0,0 +1,803 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2018 Marvell International Ltd.
>
> Should it be 2020 ?
>> + */
>> +
>> +#include <common.h>
>> +#include <i2c.h>
>> +#include <dm.h>
>> +#include <pci_ids.h>
>> +#include <asm/io.h>
>> +#include <asm/arch/clock.h>
>> +#include <linux/bitfield.h>
>> +
>> +/*
>> + * Octeon II/III (MIPS) have different register offsets than the ARM based
>> + * Octeon TX/TX2 SoCs
>> + */
>> +#if defined(CONFIG_ARCH_OCTEON)
>> +#define REG_OFFS 0x0000
>> +#else
>> +#define REG_OFFS 0x1000
>> +#endif
>
> How about getting this offset from dt ?
>> +
>> +#define TWSI_SW_TWSI (REG_OFFS + 0x00)
>> +#define TWSI_TWSI_SW (REG_OFFS + 0x08)
>> +#define TWSI_INT (REG_OFFS + 0x10)
>> +#define TWSI_SW_TWSI_EXT (REG_OFFS + 0x18)
>> +
>> +#define TWSI_SW_DATA_MASK GENMASK_ULL(31, 0)
>> +#define TWSI_SW_EOP_IA_MASK GENMASK_ULL(34, 32)
>> +#define TWSI_SW_IA_MASK GENMASK_ULL(39, 35)
>> +#define TWSI_SW_ADDR_MASK GENMASK_ULL(49, 40)
>> +#define TWSI_SW_SCR_MASK GENMASK_ULL(51, 50)
>> +#define TWSI_SW_SIZE_MASK GENMASK_ULL(54, 52)
>> +#define TWSI_SW_SOVR BIT_ULL(55)
>> +#define TWSI_SW_R BIT_ULL(56)
>> +#define TWSI_SW_OP_MASK GENMASK_ULL(60, 57)
>> +#define TWSI_SW_EIA GENMASK_ULL(61)
>> +#define TWSI_SW_SLONLY BIT_ULL(62)
>> +#define TWSI_SW_V BIT_ULL(63)
>> +
>> +#define TWSI_INT_SDA_OVR BIT_ULL(8)
>> +#define TWSI_INT_SCL_OVR BIT_ULL(9)
>> +#define TWSI_INT_SDA BIT_ULL(10)
>> +#define TWSI_INT_SCL BIT_ULL(11)
>> +
>> +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),
>> +};
>> +
>> +/*
>> + * Internal errors. When debugging is enabled, the driver will report the
>> + * error number and the user / developer can check the table below for the
>> + * detailed error description.
>> + */
>> +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
>> +};
>> +
>> +#ifndef CONFIG_SYS_I2C_OCTEON_SLAVE_ADDR
>> +# define CONFIG_SYS_I2C_OCTEON_SLAVE_ADDR 0x77
>> +#endif
>> +
>> +/**
>> + * struct octeon_twsi - Private data of this driver
>> + *
>> + * @base: Base address of i2c registers
>> + */
>> +struct octeon_twsi {
>> + void __iomem *base;
>> +};
>> +
>> +static void twsi_unblock(void *base);
>> +static int twsi_stop(void *base);
>> +
>> +#if defined(CONFIG_ARCH_OCTEON)
>> +static int get_io_clock(void)
>> +{
>> + return octeon_get_io_clock();
>> +}
>> +#else
>> +static int get_io_clock(void)
>> +{
>> + return octeontx_get_io_clock();
>> +}
>> +#endif
>> +
>> +static int twsi_thp(void)
>> +{
>> + if (IS_ENABLED(CONFIG_ARCH_OCTEON) || IS_ENABLED(CONFIG_ARCH_OCTEONTX))
>> + return 24;
>> + else
>> + return 3;
>> +}
>> +
>> +/**
>> + * Returns true if we lost arbitration
>> + *
>> + * @code status code
>> + * @final_read true if this is the final read operation
>> + * @return true if arbitration has been lost, false if it hasn't been lost.
>
> Instead of true/false, better to mention 0 on success and -ve on failure.
>> + */
>> +static int twsi_i2c_lost_arb(u8 code, int final_read)
>> +{
>> + switch (code) {
>> + 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:
>> + /* Arbitration lost */
>> + return -EAGAIN;
>> +
>> + 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:
>> + /* Being addressed as slave, should back off and listen */
>> + return -EIO;
>> +
>> + 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:
>> + /* Core busy as slave */
>> + return -EIO;
>> +
>> + case TWSI_STAT_RXDATA_ACK_SENT:
>> + /* Ack allowed on pre-terminal bytes only */
>> + if (!final_read)
>> + return 0;
>> + return -EAGAIN;
>> +
>> + case TWSI_STAT_RXDATA_NAK_SENT:
>> + /* NAK allowed on terminal byte only */
>> + 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;
>> +}
>> +
>> +#define RST_BOOT_PNR_MUL(val) (((val) >> 33) & 0x1F)
>
> Better to move this up where all macros are defined.
>
>> +
>> +/**
>> + * Writes to the MIO_TWS(0..5)_SW_TWSI register
>> + *
>> + * @base Base address of i2c registers
>> + * @val value to write
>> + * @return 0 for success, otherwise error
>> + */
>> +static u64 twsi_write_sw(void __iomem *base, u64 val)
>> +{
>> + unsigned long start = get_timer(0);
>> +
>> + val &= ~TWSI_SW_R;
>> + val |= TWSI_SW_V;
>> +
>> + debug("%s(%p, 0x%llx)\n", __func__, base, val);
>> + writeq(val, base + TWSI_SW_TWSI);
>> + do {
>> + val = readq(base + TWSI_SW_TWSI);
>> + } while ((val & TWSI_SW_V) && (get_timer(start) < 50));
>> +
>> + if (val & TWSI_SW_V)
>> + debug("%s: timed out\n", __func__);
>> + return val;
>
> newline before return, please fix globally.
>> +}
>> +
>> +/**
>> + * Reads the MIO_TWS(0..5)_SW_TWSI register
>> + *
>> + * @base Base address of i2c registers
>> + * @val value for eia and op, etc. to read
>> + * @return value of the register
>> + */
>> +static u64 twsi_read_sw(void __iomem *base, u64 val)
>> +{
>> + unsigned long start = get_timer(0);
>> +
>> + val |= TWSI_SW_R | TWSI_SW_V;
>> +
>> + debug("%s(%p, 0x%llx)\n", __func__, base, val);
>> + writeq(val, base + TWSI_SW_TWSI);
>> +
>> + do {
>> + val = readq(base + TWSI_SW_TWSI);
>> + } while ((val & TWSI_SW_V) && (get_timer(start) < 50));
>> +
>> + if (val & TWSI_SW_V)
>> + debug("%s: Error writing 0x%llx\n", __func__, val);
>> +
>> + debug("%s: Returning 0x%llx\n", __func__, val);
>> + return val;
>> +}
>> +
>> +/**
>> + * Write control register
>> + *
>> + * @base Base address for i2c registers
>> + * @data data to write
>> + */
>> +static void twsi_write_ctl(void __iomem *base, u8 data)
>> +{
>> + u64 val;
>> +
>> + debug("%s(%p, 0x%x)\n", __func__, base, data);
>> + val = data | FIELD_PREP(TWSI_SW_EOP_IA_MASK, TWSI_CTL) |
>> + FIELD_PREP(TWSI_SW_OP_MASK, TWSI_SW_EOP_IA);
>> + twsi_write_sw(base, val);
>> +}
>> +
>> +/**
>> + * Reads the TWSI Control Register
>> + *
>> + * @base Base address for i2c
>> + * @return 8-bit TWSI control register
>> + */
>> +static u8 twsi_read_ctl(void __iomem *base)
>> +{
>> + u64 val;
>> +
>> + val = FIELD_PREP(TWSI_SW_EOP_IA_MASK, TWSI_CTL) |
>> + FIELD_PREP(TWSI_SW_OP_MASK, TWSI_SW_EOP_IA);
>> + val = twsi_read_sw(base, val);
>> +
>> + debug("%s(%p): 0x%x\n", __func__, base, (u8)val);
>> + return (u8)val;
>> +}
>> +
>> +/**
>> + * Read i2c status register
>> + *
>> + * @base Base address of i2c registers
>> + * @return value of status register
>> + */
>> +static u8 twsi_read_status(void __iomem *base)
>> +{
>> + u64 val;
>> +
>> + val = FIELD_PREP(TWSI_SW_EOP_IA_MASK, TWSI_STAT) |
>> + FIELD_PREP(TWSI_SW_OP_MASK, TWSI_SW_EOP_IA);
>> +
>> + return twsi_read_sw(base, val);
>> +}
>> +
>> +/**
>> + * Waits for an i2c operation to complete
>> + *
>> + * @param base Base address of registers
>> + * @return 0 for success, 1 if timeout
>> + */
>> +static int twsi_wait(void __iomem *base)
>> +{
>> + unsigned long start = get_timer(0);
>> + u8 twsi_ctl;
>> +
>> + debug("%s(%p)\n", __func__, base);
>> + do {
>> + twsi_ctl = twsi_read_ctl(base);
>> + 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
>> + *
>> + * @base base address of registers
>> + */
>> +static int twsi_start_unstick(void __iomem *base)
>> +{
>> + twsi_stop(base);
>> + twsi_unblock(base);
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * Sends an i2c start condition
>> + *
>> + * @base base address of registers
>> + * @return 0 for success, otherwise error
>> + */
>> +static int twsi_start(void __iomem *base)
>> +{
>> + int ret;
>> + u8 stat;
>> +
>> + debug("%s(%p)\n", __func__, base);
>> + twsi_write_ctl(base, TWSI_CTL_STA | TWSI_CTL_ENAB);
>> + ret = twsi_wait(base);
>> + if (ret) {
>> + stat = twsi_read_status(base);
>> + debug("%s: ret: 0x%x, status: 0x%x\n", __func__, ret, stat);
>> + switch (stat) {
>> + case TWSI_STAT_START:
>> + case TWSI_STAT_RSTART:
>> + return 0;
>> + case TWSI_STAT_RXADDR_ACK:
>> + default:
>> + return twsi_start_unstick(base);
>> + }
>> + }
>> +
>> + debug("%s: success\n", __func__);
>> + return 0;
>> +}
>> +
>> +/**
>> + * Sends an i2c stop condition
>> + *
>> + * @base register base address
>> + * @return 0 for success, -1 if error
>> + */
>> +static int twsi_stop(void __iomem *base)
>> +{
>> + u8 stat;
>> +
>> + twsi_write_ctl(base, TWSI_CTL_STP | TWSI_CTL_ENAB);
>> +
>> + stat = twsi_read_status(base);
>> + if (stat != TWSI_STAT_IDLE) {
>> + debug("%s: Bad status on bus@%p\n", __func__, base);
>> + return -1;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * Writes data to the i2c bus
>> + *
>> + * @base register base address
>> + * @slave_addr address of slave to write to
>> + * @buffer Pointer to buffer to write
>> + * @length Number of bytes in buffer to write
>> + * @return 0 for success, otherwise error
>> + */
>> +static int twsi_write_data(void __iomem *base, u8 slave_addr,
>> + u8 *buffer, unsigned int length)
>
> This should be properly aligned.
>
>> +{
>> + unsigned int curr = 0;
>> + u64 val;
>> + int ret;
>> +
>> + debug("%s(%p, 0x%x, %p, 0x%x)\n", __func__, base, slave_addr,
>> + buffer, length);
>
> same alignment.
>
>> + ret = twsi_start(base);
>> + if (ret) {
>> + debug("%s: Could not start BUS transaction\n", __func__);
>> + return -1;
>> + }
>> +
>> + ret = twsi_wait(base);
>> + if (ret) {
>> + debug("%s: wait failed\n", __func__);
>> + return ret;
>> + }
>> +
>> + val = (u32)(slave_addr << 1) | TWSI_OP_WRITE |
>> + FIELD_PREP(TWSI_SW_EOP_IA_MASK, TWSI_DATA) |
>> + FIELD_PREP(TWSI_SW_OP_MASK, TWSI_SW_EOP_IA);
>> + twsi_write_sw(base, val);
>> + twsi_write_ctl(base, TWSI_CTL_ENAB);
>> +
>> + debug("%s: Waiting\n", __func__);
>> + ret = twsi_wait(base);
>> + if (ret) {
>> + debug("%s: Timed out writing slave address 0x%x to target\n",
>> + __func__, slave_addr);
>> + return ret;
>> + }
>> +
>> + ret = twsi_read_status(base);
>> + debug("%s: status: 0x%x\n", __func__, ret);
>> + if (ret != TWSI_STAT_TXADDR_ACK) {
>> + debug("%s: status: 0x%x\n", __func__, ret);
>> + twsi_stop(base);
>> + return twsi_i2c_lost_arb(ret, 0);
>> + }
>> +
>> + while (curr < length) {
>> + val = buffer[curr++] |
>> + FIELD_PREP(TWSI_SW_EOP_IA_MASK, TWSI_DATA) |
>> + FIELD_PREP(TWSI_SW_OP_MASK, TWSI_SW_EOP_IA);
>> + twsi_write_sw(base, val);
>> + twsi_write_ctl(base, TWSI_CTL_ENAB);
>> +
>> + debug("%s: Writing 0x%llx\n", __func__, val);
>> +
>> + ret = twsi_wait(base);
>> + if (ret) {
>> + debug("%s: Timed out writing data to 0x%x\n",
>> + __func__, slave_addr);
>> + return ret;
>> + }
>> + ret = twsi_read_status(base);
>> + debug("%s: status: 0x%x\n", __func__, ret);
>> + }
>> +
>> + debug("%s: Stopping\n", __func__);
>> + return twsi_stop(base);
>> +}
>> +
>> +/**
>> + * Manually clear the I2C bus and send a stop
>> + *
>> + * @base register base address
>> + */
>> +static void twsi_unblock(void __iomem *base)
>> +{
>> + int i;
>> +
>> + for (i = 0; i < 9; i++) {
>> + writeq(0, base + TWSI_INT);
>> + udelay(5);
>> + writeq(TWSI_INT_SCL_OVR, base + TWSI_INT);
>> + udelay(5);
>> + }
>> + writeq(TWSI_INT_SCL_OVR | TWSI_INT_SDA_OVR, base + TWSI_INT);
>> + udelay(5);
>> + writeq(TWSI_INT_SDA_OVR, base + TWSI_INT);
>> + udelay(5);
>> + writeq(0, base + TWSI_INT);
>> + udelay(5);
>> +}
>> +
>> +/**
>> + * Performs a read transaction on the i2c bus
>> + *
>> + * @base Base address of twsi registers
>> + * @slave_addr i2c bus address to read from
>> + * @buffer buffer to read into
>> + * @length number of bytes to read
>> + * @return 0 for success, otherwise error
>> + */
>> +static int twsi_read_data(void __iomem *base, u8 slave_addr,
>> + u8 *buffer, unsigned int length)
>> +{
>> + unsigned int curr = 0;
>> + u64 val;
>> + int ret;
>> +
>> + debug("%s(%p, 0x%x, %p, %u)\n", __func__, base, slave_addr,
>> + buffer, length);
>> + ret = twsi_start(base);
>> + if (ret) {
>> + debug("%s: start failed\n", __func__);
>> + return ret;
>> + }
>> +
>> + ret = twsi_wait(base);
>> + if (ret) {
>> + debug("%s: wait failed\n", __func__);
>> + return ret;
>> + }
>> +
>> + val = (u32)(slave_addr << 1) | TWSI_OP_READ |
>> + FIELD_PREP(TWSI_SW_EOP_IA_MASK, TWSI_DATA) |
>> + FIELD_PREP(TWSI_SW_OP_MASK, TWSI_SW_EOP_IA);
>> + twsi_write_sw(base, val);
>> + twsi_write_ctl(base, TWSI_CTL_ENAB);
>> +
>> + ret = twsi_wait(base);
>> + if (ret) {
>> + debug("%s: waiting for sending addr failed\n", __func__);
>> + return ret;
>> + }
>> +
>> + ret = twsi_read_status(base);
>> + debug("%s: status: 0x%x\n", __func__, ret);
>> + if (ret != TWSI_STAT_RXADDR_ACK) {
>> + debug("%s: status: 0x%x\n", __func__, ret);
>> + twsi_stop(base);
>> + return twsi_i2c_lost_arb(ret, 0);
>> + }
>> +
>> + while (curr < length) {
>> + twsi_write_ctl(base, TWSI_CTL_ENAB |
>> + ((curr < length - 1) ? TWSI_CTL_AAK : 0));
>> +
>> + ret = twsi_wait(base);
>> + if (ret) {
>> + debug("%s: waiting for data failed\n", __func__);
>> + return ret;
>> + }
>> +
>> + val = twsi_read_sw(base, val);
>> + buffer[curr++] = (u8)val;
>> + }
>> +
>> + twsi_stop(base);
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * Calculate the divisor values
>> + *
>> + * @speed Speed to set
>> + * @m_div Pointer to M divisor
>> + * @n_div Pointer to N divisor
>> + * @return 0 for success, otherwise error
>> + */
>> +static void twsi_calc_div(unsigned int speed, int *m_div, int *n_div)
>> +{
>> + int io_clock_hz;
>> + int tclk, fsamp;
>> + int ndiv, mdiv;
>> +
>> +#if defined(CONFIG_ARCH_OCTEON) || defined(CONFIG_ARCH_OCTEONTX)
>> + io_clock_hz = get_io_clock();
>> + tclk = io_clock_hz / (2 * (twsi_thp() + 1));
>> +#elif defined(CONFIG_ARCH_OCTEONTX2)
>> + /* Refclk src in mode register defaults to 100MHz clock */
>> + io_clock_hz = 100000000; /* 100 Mhz */
>> + tclk = io_clock_hz / (twsi_thp() + 2);
>> +#endif
>> + debug("%s( io_clock %u tclk %u)\n", __func__, io_clock_hz, tclk);
>> +
>> + /*
>> + * Compute the clocks M divider:
>> + *
>> + * TWSI freq = (core freq) / (10 x (M+1) x 2 * (thp+1) x 2^N)
>> + * M = ((core freq) / (10 x (TWSI freq) x 2 * (thp+1) x 2^N)) - 1
>> + *
>> + * For OcteonTX2 -
>> + * TWSI freq = (core freq) / (10 x (M+1) x (thp+2) x 2^N)
>> + * M = ((core freq) / (10 x (TWSI freq) x (thp+2) x 2^N)) - 1
>> + */
>> + for (ndiv = 0; ndiv < 8; ndiv++) {
>> + fsamp = tclk / (1 << ndiv);
>> + mdiv = fsamp / speed / 10;
>> + mdiv -= 1;
>> + if (mdiv < 16)
>> + break;
>> + }
>> +
>> + *m_div = mdiv;
>> + *n_div = ndiv;
>> +}
>> +
>> +/**
>> + * Init I2C controller
>> + *
>> + * @base Base address of twsi registers
>> + * @slave_addr I2C slave address to configure this controller to
>> + * @return 0 for success, otherwise error
>> + */
>> +static int twsi_init(void __iomem *base, int slaveaddr)
>> +{
>> + u64 val;
>> +
>> + debug("%s (%p, 0x%x)\n", __func__, base, slaveaddr);
>> +
>> + val = slaveaddr << 1 |
>> + FIELD_PREP(TWSI_SW_EOP_IA_MASK, 0) |
>> + FIELD_PREP(TWSI_SW_OP_MASK, TWSI_SW_EOP_IA) |
>> + TWSI_SW_V;
>> + twsi_write_sw(base, val);
>> +
>> + /* Set slave address */
>> + val = slaveaddr |
>> + FIELD_PREP(TWSI_SW_EOP_IA_MASK, TWSI_EOP_SLAVE_ADDR) |
>> + FIELD_PREP(TWSI_SW_OP_MASK, TWSI_SW_EOP_IA) |
>> + TWSI_SW_V;
>> + twsi_write_sw(base, val);
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * Transfers data over the i2c bus
>> + *
>> + * @bus i2c bus to transfer data over
>> + * @msg Array of i2c messages
>> + * @nmsgs Number of messages to send/receive
>> + * @return 0 for success, otherwise error
>> + */
>> +static int octeon_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
>> + int nmsgs)
>> +{
>> + struct octeon_twsi *twsi = dev_get_priv(bus);
>> + int ret;
>> + int i;
>> +
>> + debug("%s: %d messages\n", __func__, nmsgs);
>> + for (i = 0; i < nmsgs; i++, msg++) {
>> + debug("%s: chip=0x%x, len=0x%x\n", __func__, msg->addr,
>> + msg->len);
>> +
>> + if (msg->flags & I2C_M_RD) {
>> + debug("%s: Reading data\n", __func__);
>> + ret = twsi_read_data(twsi->base, msg->addr,
>> + msg->buf, msg->len);
>> + } else {
>> + debug("%s: Writing data\n", __func__);
>> + ret = twsi_write_data(twsi->base, msg->addr,
>> + msg->buf, msg->len);
>> + }
>> + if (ret) {
>> + debug("%s: error sending\n", __func__);
>> + return -EREMOTEIO;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * Set I2C bus speed
>> + *
>> + * @bus i2c bus to transfer data over
>> + * @speed Speed in Hz to set
>> + * @return 0 for success, otherwise error
>> + */
>> +static int octeon_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
>> +{
>> + struct octeon_twsi *twsi = dev_get_priv(bus);
>> + int m_div, n_div;
>> + u64 val;
>> +
>> + debug("%s(%p, %u)\n", __func__, bus, speed);
>> +
>> + twsi_calc_div(speed, &m_div, &n_div);
>> + if (m_div >= 16)
>> + return -1;
>> +
>> + val = (u32)(((m_div & 0xf) << 3) | ((n_div & 0x7) << 0)) |
>> + FIELD_PREP(TWSI_SW_EOP_IA_MASK, TWSI_CLKCTL) |
>> + FIELD_PREP(TWSI_SW_OP_MASK, TWSI_SW_EOP_IA) |
>> + TWSI_SW_V;
>> + /* Only init non-slave ports */
>> + writeq(val, twsi->base + TWSI_SW_TWSI);
>> +
>> + debug("%s: Wrote 0x%llx to sw_twsi\n", __func__, val);
>> + return 0;
>> +}
>> +
>> +/**
>> + * Driver probe function
>> + *
>> + * @dev I2C device to probe
>> + * @return 0 for success, otherwise error
>> + */
>> +static int octeon_pci_i2c_probe(struct udevice *dev)
>> +{
>> + struct octeon_twsi *twsi = dev_get_priv(dev);
>> +#if !defined(CONFIG_ARCH_OCTEON)
>> + pci_dev_t bdf = dm_pci_get_bdf(dev);
>> +
>> + debug("TWSI PCI device: %x\n", bdf);
>> + dev->req_seq = PCI_FUNC(bdf);
>> +
>> + twsi->base = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_0,
>> + PCI_REGION_MEM);
>> +#else
>> + twsi->base = dev_remap_addr(dev);
>> +#endif
>> + debug("TWSI bus %d at %p\n", dev->seq, twsi->base);
>> +
>> + /* Start with standard speed, real speed set via DT or cmd */
>> + return twsi_init(twsi->base, CONFIG_SYS_I2C_OCTEON_SLAVE_ADDR);
>> +}
>> +
>> +static const struct dm_i2c_ops octeon_i2c_ops = {
>> + .xfer = octeon_i2c_xfer,
>> + .set_bus_speed = octeon_i2c_set_bus_speed,
>> +};
>> +
>> +static const struct udevice_id octeon_i2c_ids[] = {
>> + { .compatible = "cavium,thunder-8890-twsi" },
>> + { .compatible = "cavium,octeon-7890-twsi" },
>> + { }
>> +};
>> +
>> +U_BOOT_DRIVER(octeon_pci_twsi) = {
>> + .name = "i2c_octeon",
>> + .id = UCLASS_I2C,
>> + .of_match = octeon_i2c_ids,
>> + .probe = octeon_pci_i2c_probe,
>> + .priv_auto_alloc_size = sizeof(struct octeon_twsi),
>> + .ops = &octeon_i2c_ops,
>> +};
>> +
>> +#if !defined(CONFIG_ARCH_OCTEON)
>> +static struct pci_device_id octeon_twsi_supported[] = {
>> + { PCI_VDEVICE(CAVIUM, PCI_DEVICE_ID_CAVIUM_TWSI) },
>> + { },
>> +};
>> +
>> +U_BOOT_PCI_DEVICE(octeon_pci_twsi, octeon_twsi_supported);
>> +#endif
>> --
>> 2.26.2
>>
Viele Grüße,
Stefan
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-51 Fax: (+49)-8142-66989-80 Email: sr at denx.de
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