On Wed, Aug 21, 2019 at 4:02 PM Andrey Grodzovsky
<andrey.grodzovsky@xxxxxxx> wrote:
>
> Implement HW I2C enigne controller to be used by the RAS EEPROM
> table manager. This is based on code from ATITOOLs.
>
> v2:
> Rename the file and all function prefixes to smu_v11_0_i2c
>
> By Luben's observation always fill the TX fifo to full so
> we don't have garbadge interpreted by the slave as valid data.
>
> v3:
> Remove preemption disable as the HW I2C controller will not
> stop the clock on empty TX fifo and so it's not critical to
> keep not empty queue.
> Switch to fast mode 400 khz SCL clock for faster read and write.
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/Makefile | 5 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c | 5 +-
> drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c | 710 +++++++++++++++++++++++++
> drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.h | 34 ++
> 4 files changed, 751 insertions(+), 3 deletions(-)
> create mode 100644 drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c
> create mode 100644 drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.h
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
> index f016cf1..14733ff 100644
> --- a/drivers/gpu/drm/amd/amdgpu/Makefile
> +++ b/drivers/gpu/drm/amd/amdgpu/Makefile
> @@ -38,6 +38,9 @@ ccflags-y := -I$(FULL_AMD_PATH)/include/asic_reg \
> -I$(FULL_AMD_DISPLAY_PATH)/amdgpu_dm \
> -I$(FULL_AMD_PATH)/amdkfd
>
> +
> +
> +
Drop this random whitespace change.
> amdgpu-y := amdgpu_drv.o
>
> # add KMS driver
> @@ -54,7 +57,7 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
> amdgpu_gtt_mgr.o amdgpu_vram_mgr.o amdgpu_virt.o amdgpu_atomfirmware.o \
> amdgpu_vf_error.o amdgpu_sched.o amdgpu_debugfs.o amdgpu_ids.o \
> amdgpu_gmc.o amdgpu_xgmi.o amdgpu_csa.o amdgpu_ras.o amdgpu_vm_cpu.o \
> - amdgpu_vm_sdma.o amdgpu_pmu.o amdgpu_discovery.o amdgpu_ras_eeprom.o
> + amdgpu_vm_sdma.o amdgpu_pmu.o amdgpu_discovery.o amdgpu_ras_eeprom.o smu_v11_0_i2c.o
>
> amdgpu-$(CONFIG_PERF_EVENTS) += amdgpu_pmu.o
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> index bf07515..e6b2e17 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> @@ -25,6 +25,7 @@
> #include "amdgpu.h"
> #include "amdgpu_ras.h"
> #include <linux/bits.h>
> +#include "smu_v11_0_i2c.h"
>
> #define EEPROM_I2C_TARGET_ADDR 0xA0
>
> @@ -111,7 +112,7 @@ int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control)
>
> switch (adev->asic_type) {
> case CHIP_VEGA20:
> - /*TODO Add MI-60 */
> + ret = smu_v11_0_i2c_eeprom_control_init(&control->eeprom_accessor);
> break;
>
> default:
> @@ -163,7 +164,7 @@ void amdgpu_ras_eeprom_fini(struct amdgpu_ras_eeprom_control *control)
>
> switch (adev->asic_type) {
> case CHIP_VEGA20:
> - /*TODO Add MI-60 */
> + smu_v11_0_i2c_eeprom_control_fini(&control->eeprom_accessor);
> break;
>
> default:
> diff --git a/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c b/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c
> new file mode 100644
> index 0000000..24405fa
> --- /dev/null
> +++ b/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c
> @@ -0,0 +1,710 @@
> +/*
> + * Copyright 2019 Advanced Micro Devices, Inc.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> + * OTHER DEALINGS IN THE SOFTWARE.
> + *
> + */
> +
> +#include "smuio/smuio_11_0_0_offset.h"
> +#include "smuio/smuio_11_0_0_sh_mask.h"
> +
> +#include "smu_v11_0_i2c.h"
> +#include "amdgpu.h"
> +#include "soc15_common.h"
> +#include <drm/drm_fixed.h>
> +#include "amdgpu_amdkfd.h"
> +#include <linux/i2c.h>
> +#include "amdgpu_ras.h"
> +
> +/* error codes */
> +#define I2C_OK 0
> +#define I2C_NAK_7B_ADDR_NOACK 1
> +#define I2C_NAK_TXDATA_NOACK 2
> +#define I2C_TIMEOUT 4
> +#define I2C_SW_TIMEOUT 8
> +#define I2C_ABORT 0x10
> +
> +/* I2C transaction flags */
> +#define I2C_NO_STOP 1
> +#define I2C_RESTART 2
> +
> +#define to_amdgpu_device(x) (container_of(x, struct amdgpu_ras, eeprom_control.eeprom_accessor))->adev
> +#define to_eeprom_control(x) container_of(x, struct amdgpu_ras_eeprom_control, eeprom_accessor)
> +
> +static void smu_v11_0_i2c_dis_clock_gating(struct i2c_adapter *control)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> + uint32_t reg;
> +
> + reg = RREG32_SOC15(SMUIO, 0, mmSMUIO_PWRMGT);
> + reg = REG_SET_FIELD(reg, SMUIO_PWRMGT, i2c_clk_gate_en, 0);
> + WREG32_SOC15(SMUIO, 0, mmSMUIO_PWRMGT, reg);
> +}
Do we need to worry about re-enabling clock gating when we are done?
> +
> +
> +static void smu_v11_0_i2c_enable(struct i2c_adapter *control, bool enable)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> +
> + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE, enable ? 1 : 0);
> +}
> +
> +static void smu_v11_0_i2c_clear_status(struct i2c_adapter *control)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> + /* do */
> + {
> + RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_CLR_INTR);
> +
> + } /* while (reg_CKSVII2C_ic_clr_intr == 0) */
> +}
> +
> +static void smu_v11_0_i2c_configure(struct i2c_adapter *control)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> + uint32_t reg = 0;
> +
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_SLAVE_DISABLE, 1);
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_RESTART_EN, 1);
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_10BITADDR_MASTER, 0);
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_10BITADDR_SLAVE, 0);
> + /* Standard mode */
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_MAX_SPEED_MODE, 2);
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_MASTER_MODE, 1);
> +
> + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_CON, reg);
> +}
> +
> +static void smu_v11_0_i2c_set_clock(struct i2c_adapter *control)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> +
> + /*
> + * Standard mode speed, These values are taken from SMUIO MAS,
> + * but are different from what is given is
> + * Synopsys spec. The values here are based on assumption
> + * that refclock is 100MHz
> + *
> + * Configuration for standard mode; Speed = 100kbps
> + * Scale linearly, for now only support standard speed clock
> + * This will work only with 100M ref clock
> + *
> + * TBD:Change the calculation to take into account ref clock values also.
> + */
> +
> + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_FS_SPKLEN, 2);
> + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_SS_SCL_HCNT, 120);
> + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_SS_SCL_LCNT, 130);
> + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_SDA_HOLD, 20);
> +}
> +
> +static void smu_v11_0_i2c_set_address(struct i2c_adapter *control, uint8_t address)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> +
> + /* Convert fromr 8-bit to 7-bit address */
> + address >>= 1;
> + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_TAR, (address & 0xFF));
> +}
> +
> +static uint32_t smu_v11_0_i2c_poll_tx_status(struct i2c_adapter *control)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> + uint32_t ret = I2C_OK;
> + uint32_t reg, reg_c_tx_abrt_source;
> +
> + /*Check if transmission is completed */
> + unsigned long timeout_counter = jiffies + msecs_to_jiffies(20);
> +
> + do {
> + reg = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS);
> +
> + if (time_after(jiffies, timeout_counter)) {
> + ret |= I2C_SW_TIMEOUT;
> + break;
> + }
> + } while (REG_GET_FIELD(reg, CKSVII2C_IC_STATUS, TFE) == 0);
> +
> + if (ret != I2C_OK)
> + return ret;
> +
> + /* This only checks if NAK is received and transaction got aborted */
> + reg = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_INTR_STAT);
> +
> + if (REG_GET_FIELD(reg, CKSVII2C_IC_INTR_STAT, R_TX_ABRT) == 1) {
> + reg_c_tx_abrt_source = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_TX_ABRT_SOURCE);
> + DRM_INFO("TX was terminated, IC_TX_ABRT_SOURCE val is:%x", reg_c_tx_abrt_source);
> +
> + /* Check for stop due to NACK */
> + if (REG_GET_FIELD(reg_c_tx_abrt_source,
> + CKSVII2C_IC_TX_ABRT_SOURCE,
> + ABRT_TXDATA_NOACK) == 1) {
> +
> + ret |= I2C_NAK_TXDATA_NOACK;
> +
> + } else if (REG_GET_FIELD(reg_c_tx_abrt_source,
> + CKSVII2C_IC_TX_ABRT_SOURCE,
> + ABRT_7B_ADDR_NOACK) == 1) {
> +
> + ret |= I2C_NAK_7B_ADDR_NOACK;
> + } else {
> + ret |= I2C_ABORT;
> + }
> +
> + smu_v11_0_i2c_clear_status(control);
> + }
> +
> + return ret;
> +}
> +
> +static uint32_t smu_v11_0_i2c_poll_rx_status(struct i2c_adapter *control)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> + uint32_t ret = I2C_OK;
> + uint32_t reg_ic_status, reg_c_tx_abrt_source;
> +
> + reg_c_tx_abrt_source = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_TX_ABRT_SOURCE);
> +
> + /* If slave is not present */
> + if (REG_GET_FIELD(reg_c_tx_abrt_source,
> + CKSVII2C_IC_TX_ABRT_SOURCE,
> + ABRT_7B_ADDR_NOACK) == 1) {
> + ret |= I2C_NAK_7B_ADDR_NOACK;
> +
> + smu_v11_0_i2c_clear_status(control);
> + } else { /* wait till some data is there in RXFIFO */
> + /* Poll for some byte in RXFIFO */
> + unsigned long timeout_counter = jiffies + msecs_to_jiffies(20);
> +
> + do {
> + reg_ic_status = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS);
> +
> + if (time_after(jiffies, timeout_counter)) {
> + ret |= I2C_SW_TIMEOUT;
> + break;
> + }
> + } while (REG_GET_FIELD(reg_ic_status, CKSVII2C_IC_STATUS, RFNE) == 0);
> + }
> +
> + return ret;
> +}
> +
> +
> +
> +
> +/**
> + * smu_v11_0_i2c_transmit - Send a block of data over the I2C bus to a slave device.
> + *
> + * @address: The I2C address of the slave device.
> + * @data: The data to transmit over the bus.
> + * @numbytes: The amount of data to transmit.
> + * @i2c_flag: Flags for transmission
> + *
> + * Returns 0 on success or error.
> + */
> +static uint32_t smu_v11_0_i2c_transmit(struct i2c_adapter *control,
> + uint8_t address, uint8_t *data,
> + uint32_t numbytes, uint32_t i2c_flag)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> + uint32_t bytes_sent, reg, ret = 0;
> + unsigned long timeout_counter;
> +
> + bytes_sent = 0;
> +
> + DRM_DEBUG_DRIVER("I2C_Transmit(), address = %x, bytes = %d , data: ",
> + (uint16_t)address, numbytes);
> +
> + if (drm_debug & DRM_UT_DRIVER) {
> + print_hex_dump(KERN_INFO, "data: ", DUMP_PREFIX_NONE,
> + 16, 1, data, numbytes, false);
> + }
> +
> + /* Set the I2C slave address */
> + smu_v11_0_i2c_set_address(control, address);
> + /* Enable I2C */
> + smu_v11_0_i2c_enable(control, true);
> +
> + /* Clear status bits */
> + smu_v11_0_i2c_clear_status(control);
> +
> +
> + timeout_counter = jiffies + msecs_to_jiffies(20);
> +
> + while (numbytes > 0) {
> + reg = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS);
> + if (REG_GET_FIELD(reg, CKSVII2C_IC_STATUS, TFNF)) {
> + do {
> + reg = 0;
> + /*
> + * Prepare transaction, no need to set RESTART. I2C engine will send
> + * START as soon as it sees data in TXFIFO
> + */
> + if (bytes_sent == 0)
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, RESTART,
> + (i2c_flag & I2C_RESTART) ? 1 : 0);
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, DAT, data[bytes_sent]);
> +
> + /* determine if we need to send STOP bit or not */
> + if (numbytes == 1)
> + /* Final transaction, so send stop unless I2C_NO_STOP */
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, STOP,
> + (i2c_flag & I2C_NO_STOP) ? 0 : 1);
> + /* Write */
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, CMD, 0);
> + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_DATA_CMD, reg);
> +
> + /* Record that the bytes were transmitted */
> + bytes_sent++;
> + numbytes--;
> +
> + reg = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS);
> +
> + } while (numbytes && REG_GET_FIELD(reg, CKSVII2C_IC_STATUS, TFNF));
> + }
> +
> +
> + if (time_after(jiffies, timeout_counter)) {
> + ret |= I2C_SW_TIMEOUT;
> + goto err;
> + }
> + }
> +
> + ret = smu_v11_0_i2c_poll_tx_status(control);
> +
> +err:
> + /* Any error, no point in proceeding */
> + if (ret != I2C_OK) {
> + if (ret & I2C_SW_TIMEOUT)
> + DRM_ERROR("TIMEOUT ERROR !!!");
> +
> + if (ret & I2C_NAK_7B_ADDR_NOACK)
> + DRM_ERROR("Received I2C_NAK_7B_ADDR_NOACK !!!");
> +
> +
> + if (ret & I2C_NAK_TXDATA_NOACK)
> + DRM_ERROR("Received I2C_NAK_TXDATA_NOACK !!!");
> + }
> +
> + return ret;
> +}
> +
> +
> +/**
> + * smu_v11_0_i2c_receive - Receive a block of data over the I2C bus from a slave device.
> + *
> + * @address: The I2C address of the slave device.
> + * @numbytes: The amount of data to transmit.
> + * @i2c_flag: Flags for transmission
> + *
> + * Returns 0 on success or error.
> + */
> +static uint32_t smu_v11_0_i2c_receive(struct i2c_adapter *control,
> + uint8_t address, uint8_t *data,
> + uint32_t numbytes, uint8_t i2c_flag)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> + uint32_t bytes_received, ret = I2C_OK;
> +
> + bytes_received = 0;
> +
> + /* Set the I2C slave address */
> + smu_v11_0_i2c_set_address(control, address);
> +
> + /* Enable I2C */
> + smu_v11_0_i2c_enable(control, true);
> +
> + while (numbytes > 0) {
> + uint32_t reg = 0;
> +
> + smu_v11_0_i2c_clear_status(control);
> +
> +
> + /* Prepare transaction */
> +
> + /* Each time we disable I2C, so this is not a restart */
> + if (bytes_received == 0)
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, RESTART,
> + (i2c_flag & I2C_RESTART) ? 1 : 0);
> +
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, DAT, 0);
> + /* Read */
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, CMD, 1);
> +
> + /* Transmitting last byte */
> + if (numbytes == 1)
> + /* Final transaction, so send stop if requested */
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, STOP,
> + (i2c_flag & I2C_NO_STOP) ? 0 : 1);
> +
> + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_DATA_CMD, reg);
> +
> + ret = smu_v11_0_i2c_poll_rx_status(control);
> +
> + /* Any error, no point in proceeding */
> + if (ret != I2C_OK) {
> + if (ret & I2C_SW_TIMEOUT)
> + DRM_ERROR("TIMEOUT ERROR !!!");
> +
> + if (ret & I2C_NAK_7B_ADDR_NOACK)
> + DRM_ERROR("Received I2C_NAK_7B_ADDR_NOACK !!!");
> +
> + if (ret & I2C_NAK_TXDATA_NOACK)
> + DRM_ERROR("Received I2C_NAK_TXDATA_NOACK !!!");
> +
> + break;
> + }
> +
> + reg = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_DATA_CMD);
> + data[bytes_received] = REG_GET_FIELD(reg, CKSVII2C_IC_DATA_CMD, DAT);
> +
> + /* Record that the bytes were received */
> + bytes_received++;
> + numbytes--;
> + }
> +
> + DRM_DEBUG_DRIVER("I2C_Receive(), address = %x, bytes = %d, data :",
> + (uint16_t)address, bytes_received);
> +
> + if (drm_debug & DRM_UT_DRIVER) {
> + print_hex_dump(KERN_INFO, "data: ", DUMP_PREFIX_NONE,
> + 16, 1, data, bytes_received, false);
> + }
> +
> + return ret;
> +}
> +
> +static void smu_v11_0_i2c_abort(struct i2c_adapter *control)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> + uint32_t reg = 0;
> +
> + /* Enable I2C engine; */
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_ENABLE, ENABLE, 1);
> + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE, reg);
> +
> + /* Abort previous transaction */
> + reg = REG_SET_FIELD(reg, CKSVII2C_IC_ENABLE, ABORT, 1);
> + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE, reg);
> +
> + DRM_DEBUG_DRIVER("I2C_Abort() Done.");
> +}
> +
> +
> +static bool smu_v11_0_i2c_activity_done(struct i2c_adapter *control)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> +
> + const uint32_t IDLE_TIMEOUT = 1024;
> + uint32_t timeoutCount = 0;
kernel coding style prefers non CamelCase. E.g., timeout_count.
> + uint32_t reg_ic_enable, reg_ic_enable_status, reg_ic_clr_activity;
> +
> + reg_ic_enable_status = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE_STATUS);
> + reg_ic_enable = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE);
> +
> +
> + if ((REG_GET_FIELD(reg_ic_enable, CKSVII2C_IC_ENABLE, ENABLE) == 0) &&
> + (REG_GET_FIELD(reg_ic_enable_status, CKSVII2C_IC_ENABLE_STATUS, IC_EN) == 1)) {
> + /*
> + * Nobody is using I2C engine, but engine remains active because
> + * someone missed to send STOP
> + */
> + smu_v11_0_i2c_abort(control);
> + } else if (REG_GET_FIELD(reg_ic_enable, CKSVII2C_IC_ENABLE, ENABLE) == 0) {
> + /* Nobody is using I2C engine */
> + return true;
> + }
> +
> + /* Keep reading activity bit until it's cleared */
> + do {
> + reg_ic_clr_activity = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_CLR_ACTIVITY);
> +
> + if (REG_GET_FIELD(reg_ic_clr_activity,
> + CKSVII2C_IC_CLR_ACTIVITY, CLR_ACTIVITY) == 0)
> + return true;
> +
> + ++timeoutCount;
> +
> + } while (timeoutCount < IDLE_TIMEOUT);
> +
> + return false;
> +}
> +
> +static void smu_v11_0_i2c_init(struct i2c_adapter *control)
> +{
> + /* Disable clock gating */
> + smu_v11_0_i2c_dis_clock_gating(control);
> +
> + if (!smu_v11_0_i2c_activity_done(control))
> + DRM_WARN("I2C busy !");
> +
> + /* Disable I2C */
> + smu_v11_0_i2c_enable(control, false);
> +
> + /* Configure I2C to operate as master and in standard mode */
> + smu_v11_0_i2c_configure(control);
> +
> + /* Initialize the clock to 50 kHz default */
> + smu_v11_0_i2c_set_clock(control);
> +
> +}
> +
> +static void smu_v11_0_i2c_fini(struct i2c_adapter *control)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> + uint32_t reg_ic_enable_status, reg_ic_enable;
> +
> + smu_v11_0_i2c_enable(control, false);
> +
> + /* Double check if disabled, else force abort */
> + reg_ic_enable_status = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE_STATUS);
> + reg_ic_enable = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE);
> +
> + if ((REG_GET_FIELD(reg_ic_enable, CKSVII2C_IC_ENABLE, ENABLE) == 0) &&
> + (REG_GET_FIELD(reg_ic_enable_status,
> + CKSVII2C_IC_ENABLE_STATUS, IC_EN) == 1)) {
> + /*
> + * Nobody is using I2C engine, but engine remains active because
> + * someone missed to send STOP
> + */
> + smu_v11_0_i2c_abort(control);
> + }
> +
> +}
> +
> +static bool smu_v11_0_i2c_bus_lock(struct i2c_adapter *control)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> +
> + /* Send PPSMC_MSG_RequestI2CBus */
> + if (!adev->powerplay.pp_funcs->smu_i2c_bus_access)
> + goto fail;
> +
> +
> + if (!adev->powerplay.pp_funcs->smu_i2c_bus_access(adev->powerplay.pp_handle, true))
> + return true;
> +
> +fail:
> + return false;
> +}
> +
> +static bool smu_v11_0_i2c_bus_unlock(struct i2c_adapter *control)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> +
> + /* Send PPSMC_MSG_RequestI2CBus */
> + if (!adev->powerplay.pp_funcs->smu_i2c_bus_access)
> + goto fail;
> +
> + /* Send PPSMC_MSG_ReleaseI2CBus */
> + if (!adev->powerplay.pp_funcs->smu_i2c_bus_access(adev->powerplay.pp_handle,
> + false))
> + return true;
> +
> +fail:
> + return false;
> +}
> +
> +/***************************** EEPROM I2C GLUE ****************************/
> +
> +static uint32_t smu_v11_0_i2c_eeprom_read_data(struct i2c_adapter *control,
> + uint8_t address,
> + uint8_t *data,
> + uint32_t numbytes)
> +{
> + uint32_t ret = 0;
> +
> + /* First 2 bytes are dummy write to set EEPROM address */
> + ret = smu_v11_0_i2c_transmit(control, address, data, 2, I2C_NO_STOP);
> + if (ret != I2C_OK)
> + goto fail;
> +
> + /* Now read data starting with that address */
> + ret = smu_v11_0_i2c_receive(control, address, data + 2, numbytes - 2,
> + I2C_RESTART);
> +
> +fail:
> + if (ret != I2C_OK)
> + DRM_ERROR("ReadData() - I2C error occurred :%x", ret);
> +
> + return ret;
> +}
> +
> +static uint32_t smu_v11_0_i2c_eeprom_write_data(struct i2c_adapter *control,
> + uint8_t address,
> + uint8_t *data,
> + uint32_t numbytes)
> +{
> + uint32_t ret;
> +
> + ret = smu_v11_0_i2c_transmit(control, address, data, numbytes, 0);
> +
> + if (ret != I2C_OK)
> + DRM_ERROR("WriteI2CData() - I2C error occurred :%x", ret);
> + else
> + /*
> + * According to EEPROM spec there is a MAX of 10 ms required for
> + * EEPROM to flush internal RX buffer after STOP was issued at the
> + * end of write transaction. During this time the EEPROM will not be
> + * responsive to any more commands - so wait a bit more.
> + *
> + * TODO Improve to wait for first ACK for slave address after
> + * internal write cycle done.
> + */
> + msleep(10);
> +
> + return ret;
> +
> +}
> +
> +static void lock_bus(struct i2c_adapter *i2c, unsigned int flags)
> +{
> + struct amdgpu_ras_eeprom_control *control = to_eeprom_control(i2c);
> +
> + if (!smu_v11_0_i2c_bus_lock(i2c)) {
> + DRM_ERROR("Failed to lock the bus from SMU");
> + return;
> + }
> +
> + control->bus_locked = true;
> +}
> +
> +static int trylock_bus(struct i2c_adapter *i2c, unsigned int flags)
> +{
> + WARN_ONCE(1, "This operation not supposed to run in atomic context!");
> + return false;
> +}
> +
> +static void unlock_bus(struct i2c_adapter *i2c, unsigned int flags)
> +{
> + struct amdgpu_ras_eeprom_control *control = to_eeprom_control(i2c);
> +
> + if (!smu_v11_0_i2c_bus_unlock(i2c)) {
> + DRM_ERROR("Failed to unlock the bus from SMU");
> + return;
> + }
> +
> + control->bus_locked = false;
> +}
> +
> +static const struct i2c_lock_operations smu_v11_0_i2c_i2c_lock_ops = {
> + .lock_bus = lock_bus,
> + .trylock_bus = trylock_bus,
> + .unlock_bus = unlock_bus,
> +};
> +
> +static int smu_v11_0_i2c_eeprom_i2c_xfer(struct i2c_adapter *i2c_adap,
> + struct i2c_msg *msgs, int num)
> +{
> + int i, ret;
> + struct amdgpu_ras_eeprom_control *control = to_eeprom_control(i2c_adap);
> +
> + if (!control->bus_locked) {
> + DRM_ERROR("I2C bus unlocked, stopping transaction!");
> + return -EIO;
> + }
> +
> + smu_v11_0_i2c_init(i2c_adap);
> +
> + for (i = 0; i < num; i++) {
> + if (msgs[i].flags & I2C_M_RD)
> + ret = smu_v11_0_i2c_eeprom_read_data(i2c_adap,
> + (uint8_t)msgs[i].addr,
> + msgs[i].buf, msgs[i].len);
> + else
> + ret = smu_v11_0_i2c_eeprom_write_data(i2c_adap,
> + (uint8_t)msgs[i].addr,
> + msgs[i].buf, msgs[i].len);
> +
> + if (ret != I2C_OK) {
> + num = -EIO;
> + break;
> + }
> + }
> +
> + smu_v11_0_i2c_fini(i2c_adap);
> + return num;
> +}
> +
> +static u32 smu_v11_0_i2c_eeprom_i2c_func(struct i2c_adapter *adap)
> +{
> + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +
> +static const struct i2c_algorithm smu_v11_0_i2c_eeprom_i2c_algo = {
> + .master_xfer = smu_v11_0_i2c_eeprom_i2c_xfer,
> + .functionality = smu_v11_0_i2c_eeprom_i2c_func,
> +};
> +
> +int smu_v11_0_i2c_eeprom_control_init(struct i2c_adapter *control)
> +{
> + struct amdgpu_device *adev = to_amdgpu_device(control);
> + int res;
> +
> + control->owner = THIS_MODULE;
> + control->class = I2C_CLASS_SPD;
> + control->dev.parent = &adev->pdev->dev;
> + control->algo = &smu_v11_0_i2c_eeprom_i2c_algo;
> + snprintf(control->name, sizeof(control->name), "RAS EEPROM");
> + control->lock_ops = &smu_v11_0_i2c_i2c_lock_ops;
> +
> + res = i2c_add_adapter(control);
> + if (res)
> + DRM_ERROR("Failed to register hw i2c, err: %d\n", res);
> +
> + return res;
> +}
> +
> +void smu_v11_0_i2c_eeprom_control_fini(struct i2c_adapter *control)
> +{
> + i2c_del_adapter(control);
> +}
> +
> +#define I2C_TARGET_ADDR 0xA0
> +
> +bool smu_v11_0_i2c_test_bus(struct i2c_adapter *control)
> +{
> +
> + uint32_t ret = I2C_OK;
> + uint8_t data[6] = {0xf, 0, 0xde, 0xad, 0xbe, 0xef};
> +
> +
> + DRM_INFO("Begin");
> +
> + if (!smu_v11_0_i2c_bus_lock(control)) {
> + DRM_ERROR("Failed to lock the bus!.");
> + return false;
> + }
> +
> + smu_v11_0_i2c_init(control);
> +
> + /* Write 0xde to address 0x0000 on the EEPROM */
> + ret = smu_v11_0_i2c_eeprom_write_data(control, I2C_TARGET_ADDR, data, 6);
> +
> + ret = smu_v11_0_i2c_eeprom_read_data(control, I2C_TARGET_ADDR, data, 6);
> +
> + smu_v11_0_i2c_fini(control);
> +
> + smu_v11_0_i2c_bus_unlock(control);
> +
> +
> + DRM_INFO("End");
> + return true;
> +}
Leftover debugging function?
> diff --git a/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.h b/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.h
> new file mode 100644
> index 0000000..973f28d
> --- /dev/null
> +++ b/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.h
> @@ -0,0 +1,34 @@
> +/*
> + * Copyright 2019 Advanced Micro Devices, Inc.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> + * OTHER DEALINGS IN THE SOFTWARE.
> + *
> + */
> +
> +#ifndef SMU_V11_I2C_CONTROL_H
> +#define SMU_V11_I2C_CONTROL_H
> +
> +#include <linux/types.h>
> +
> +struct i2c_adapter;
> +
> +int smu_v11_0_i2c_eeprom_control_init(struct i2c_adapter *control);
> +void smu_v11_0_i2c_eeprom_control_fini(struct i2c_adapter *control);
> +
> +#endif
> --
> 2.7.4
>
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