diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/Makefile | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c | 5 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c | 724 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.h | 34 |
4 files changed, 762 insertions, 3 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile index f016cf118b1b..42e2c1f57152 100644 --- a/drivers/gpu/drm/amd/amdgpu/Makefile +++ b/drivers/gpu/drm/amd/amdgpu/Makefile @@ -54,7 +54,7 @@ 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 b544e0a05925..86110e6095cc 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 @@ -118,7 +119,7 @@ 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: @@ -170,7 +171,7 @@ 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 000000000000..4a5951036927 --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c @@ -0,0 +1,724 @@ +/* + * 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 <drm/drm_drv.h> +#include "amdgpu_amdkfd.h" +#include <linux/i2c.h> +#include <linux/pci.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_set_clock_gating(struct i2c_adapter *control, bool en) +{ + struct amdgpu_device *adev = to_amdgpu_device(control); + uint32_t reg = RREG32_SOC15(SMUIO, 0, mmSMUIO_PWRMGT); + + reg = REG_SET_FIELD(reg, SMUIO_PWRMGT, i2c_clk_gate_en, en ? 1 : 0); + WREG32_SOC15(SMUIO, 0, mmSMUIO_PWRMGT, reg); +} + + +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 { + if (time_after(jiffies, timeout_counter)) { + ret |= I2C_SW_TIMEOUT; + break; + } + + reg = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS); + + } 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 { + if (time_after(jiffies, timeout_counter)) { + ret |= I2C_SW_TIMEOUT; + break; + } + + reg_ic_status = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS); + + } 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)); + } + + /* + * We waited too long for the transmission FIFO to become not-full. + * Exit the loop with error. + */ + 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 timeout_count = 0; + 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; + + ++timeout_count; + + } while (timeout_count < IDLE_TIMEOUT); + + return false; +} + +static void smu_v11_0_i2c_init(struct i2c_adapter *control) +{ + /* Disable clock gating */ + smu_v11_0_i2c_set_clock_gating(control, false); + + 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); + } + + /* Restore clock gating */ + smu_v11_0_i2c_set_clock_gating(control, true); + +} + +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); +} + +/* + * Keep this for future unit test if bugs arise + */ +#if 0 +#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; +} +#endif 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 000000000000..973f28d68e70 --- /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 |