diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c | 797 |
1 files changed, 797 insertions, 0 deletions
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 000000000..dd2d66090 --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c @@ -0,0 +1,797 @@ +/* + * 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 "amdgpu_dpm.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> + +/* 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 + +#define I2C_X_RESTART BIT(31) + +static void smu_v11_0_i2c_set_clock_gating(struct i2c_adapter *control, bool en) +{ + struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + 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); +} + +/* The T_I2C_POLL_US is defined as follows: + * + * "Define a timer interval (t_i2c_poll) equal to 10 times the + * signalling period for the highest I2C transfer speed used in the + * system and supported by DW_apb_i2c. For instance, if the highest + * I2C data transfer mode is 400 kb/s, then t_i2c_poll is 25 us." -- + * DesignWare DW_apb_i2c Databook, Version 1.21a, section 3.8.3.1, + * page 56, with grammar and syntax corrections. + * + * Vcc for our device is at 1.8V which puts it at 400 kHz, + * see Atmel AT24CM02 datasheet, section 8.3 DC Characteristics table, page 14. + * + * The procedure to disable the IP block is described in section + * 3.8.3 Disabling DW_apb_i2c on page 56. + */ +#define I2C_SPEED_MODE_FAST 2 +#define T_I2C_POLL_US 25 +#define I2C_MAX_T_POLL_COUNT 1000 + +static int smu_v11_0_i2c_enable(struct i2c_adapter *control, bool enable) +{ + struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE, enable ? 1 : 0); + + if (!enable) { + int ii; + + for (ii = I2C_MAX_T_POLL_COUNT; ii > 0; ii--) { + u32 en_stat = RREG32_SOC15(SMUIO, + 0, + mmCKSVII2C_IC_ENABLE_STATUS); + if (REG_GET_FIELD(en_stat, CKSVII2C_IC_ENABLE_STATUS, IC_EN)) + udelay(T_I2C_POLL_US); + else + return I2C_OK; + } + + return I2C_ABORT; + } + + return I2C_OK; +} + +static void smu_v11_0_i2c_clear_status(struct i2c_adapter *control) +{ + struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + /* 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_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + 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); + /* The values of IC_MAX_SPEED_MODE are, + * 1: standard mode, 0 - 100 Kb/s, + * 2: fast mode, <= 400 Kb/s, or fast mode plus, <= 1000 Kb/s, + * 3: high speed mode, <= 3.4 Mb/s. + */ + reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_MAX_SPEED_MODE, + I2C_SPEED_MODE_FAST); + 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_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + + /* + * 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, u16 address) +{ + struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + + /* The IC_TAR::IC_TAR field is 10-bits wide. + * It takes a 7-bit or 10-bit addresses as an address, + * i.e. no read/write bit--no wire format, just the address. + */ + WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_TAR, address & 0x3FF); +} + +static uint32_t smu_v11_0_i2c_poll_tx_status(struct i2c_adapter *control) +{ + struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + 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_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + 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. + * + * @control: I2C adapter reference + * @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, + u16 address, u8 *data, + u32 numbytes, u32 i2c_flag) +{ + struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + u32 bytes_sent, reg, ret = I2C_OK; + unsigned long timeout_counter; + + bytes_sent = 0; + + DRM_DEBUG_DRIVER("I2C_Transmit(), address = %x, bytes = %d , data: ", + address, numbytes); + + if (drm_debug_enabled(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)) { + /* + * We waited for 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; + } + } else { + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, DAT, + data[bytes_sent]); + + /* Final message, final byte, must generate a + * STOP to release the bus, i.e. don't hold + * SCL low. + */ + if (numbytes == 1 && i2c_flag & I2C_M_STOP) + reg = REG_SET_FIELD(reg, + CKSVII2C_IC_DATA_CMD, + STOP, 1); + + if (bytes_sent == 0 && i2c_flag & I2C_X_RESTART) + reg = REG_SET_FIELD(reg, + CKSVII2C_IC_DATA_CMD, + RESTART, 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--; + } + } + + 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. + * + * @control: I2C adapter reference + * @address: The I2C address of the slave device. + * @data: Placeholder to store received data. + * @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, + u16 address, u8 *data, + u32 numbytes, u32 i2c_flag) +{ + struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + 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 */ + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, DAT, 0); + /* Read */ + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, CMD, 1); + + /* Final message, final byte, must generate a STOP + * to release the bus, i.e. don't hold SCL low. + */ + if (numbytes == 1 && i2c_flag & I2C_M_STOP) + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, + STOP, 1); + + if (bytes_received == 0 && i2c_flag & I2C_X_RESTART) + reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, + RESTART, 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_enabled(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_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + 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_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + + 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) +{ + int res; + + /* 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 */ + res = smu_v11_0_i2c_enable(control, false); + if (res != I2C_OK) + smu_v11_0_i2c_abort(control); + + /* 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_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + u32 status, enable, en_stat; + int res; + + res = smu_v11_0_i2c_enable(control, false); + if (res != I2C_OK) { + status = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS); + enable = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE); + en_stat = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE_STATUS); + + /* Nobody is using the I2C engine, yet it remains + * active, possibly because someone missed to send + * STOP. + */ + DRM_DEBUG_DRIVER("Aborting from fini: status:0x%08x " + "enable:0x%08x enable_stat:0x%08x", + status, enable, en_stat); + smu_v11_0_i2c_abort(control); + } + + /* Restore clock gating */ + + /* + * TODO Reenabling clock gating seems to break subsequent SMU operation + * on the I2C bus. My guess is that SMU doesn't disable clock gating like + * we do here before working with the bus. So for now just don't restore + * it but later work with SMU to see if they have this issue and can + * update their code appropriately + */ + /* smu_v11_0_i2c_set_clock_gating(control, true); */ + +} + +static bool smu_v11_0_i2c_bus_lock(struct i2c_adapter *control) +{ + struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + + /* Send PPSMC_MSG_RequestI2CBus */ + if (!amdgpu_dpm_smu_i2c_bus_access(adev, true)) + return true; + + return false; +} + +static bool smu_v11_0_i2c_bus_unlock(struct i2c_adapter *control) +{ + struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); + struct amdgpu_device *adev = smu_i2c->adev; + + /* Send PPSMC_MSG_ReleaseI2CBus */ + if (!amdgpu_dpm_smu_i2c_bus_access(adev, false)) + return true; + + return false; +} + +/***************************** I2C GLUE ****************************/ + +static uint32_t smu_v11_0_i2c_read_data(struct i2c_adapter *control, + struct i2c_msg *msg, uint32_t i2c_flag) +{ + uint32_t ret; + + ret = smu_v11_0_i2c_receive(control, msg->addr, msg->buf, msg->len, i2c_flag); + + if (ret != I2C_OK) + DRM_ERROR("ReadData() - I2C error occurred :%x", ret); + + return ret; +} + +static uint32_t smu_v11_0_i2c_write_data(struct i2c_adapter *control, + struct i2c_msg *msg, uint32_t i2c_flag) +{ + uint32_t ret; + + ret = smu_v11_0_i2c_transmit(control, msg->addr, msg->buf, msg->len, i2c_flag); + + if (ret != I2C_OK) + DRM_ERROR("WriteI2CData() - I2C error occurred :%x", ret); + + return ret; + +} + +static void lock_bus(struct i2c_adapter *i2c, unsigned int flags) +{ + struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(i2c); + struct amdgpu_device *adev = smu_i2c->adev; + + mutex_lock(&smu_i2c->mutex); + if (!smu_v11_0_i2c_bus_lock(i2c)) + DRM_ERROR("Failed to lock the bus from SMU"); + else + adev->pm.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_smu_i2c_bus *smu_i2c = i2c_get_adapdata(i2c); + struct amdgpu_device *adev = smu_i2c->adev; + + if (!smu_v11_0_i2c_bus_unlock(i2c)) + DRM_ERROR("Failed to unlock the bus from SMU"); + else + adev->pm.bus_locked = false; + mutex_unlock(&smu_i2c->mutex); +} + +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_xfer(struct i2c_adapter *i2c_adap, + struct i2c_msg *msg, int num) +{ + int i, ret; + u16 addr, dir; + + smu_v11_0_i2c_init(i2c_adap); + + /* From the client's point of view, this sequence of + * messages-- the array i2c_msg *msg, is a single transaction + * on the bus, starting with START and ending with STOP. + * + * The client is welcome to send any sequence of messages in + * this array, as processing under this function here is + * striving to be agnostic. + * + * Record the first address and direction we see. If either + * changes for a subsequent message, generate ReSTART. The + * DW_apb_i2c databook, v1.21a, specifies that ReSTART is + * generated when the direction changes, with the default IP + * block parameter settings, but it doesn't specify if ReSTART + * is generated when the address changes (possibly...). We + * don't rely on the default IP block parameter settings as + * the block is shared and they may change. + */ + if (num > 0) { + addr = msg[0].addr; + dir = msg[0].flags & I2C_M_RD; + } + + for (i = 0; i < num; i++) { + u32 i2c_flag = 0; + + if (msg[i].addr != addr || (msg[i].flags ^ dir) & I2C_M_RD) { + addr = msg[i].addr; + dir = msg[i].flags & I2C_M_RD; + i2c_flag |= I2C_X_RESTART; + } + + if (i == num - 1) { + /* Set the STOP bit on the last message, so + * that the IP block generates a STOP after + * the last byte of the message. + */ + i2c_flag |= I2C_M_STOP; + } + + if (msg[i].flags & I2C_M_RD) + ret = smu_v11_0_i2c_read_data(i2c_adap, + msg + i, + i2c_flag); + else + ret = smu_v11_0_i2c_write_data(i2c_adap, + msg + i, + i2c_flag); + + if (ret != I2C_OK) { + num = -EIO; + break; + } + } + + smu_v11_0_i2c_fini(i2c_adap); + return num; +} + +static u32 smu_v11_0_i2c_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +static const struct i2c_algorithm smu_v11_0_i2c_algo = { + .master_xfer = smu_v11_0_i2c_xfer, + .functionality = smu_v11_0_i2c_func, +}; + +static const struct i2c_adapter_quirks smu_v11_0_i2c_control_quirks = { + .flags = I2C_AQ_NO_ZERO_LEN, +}; + +int smu_v11_0_i2c_control_init(struct amdgpu_device *adev) +{ + struct amdgpu_smu_i2c_bus *smu_i2c = &adev->pm.smu_i2c[0]; + struct i2c_adapter *control = &smu_i2c->adapter; + int res; + + smu_i2c->adev = adev; + smu_i2c->port = 0; + mutex_init(&smu_i2c->mutex); + control->owner = THIS_MODULE; + control->class = I2C_CLASS_HWMON; + control->dev.parent = &adev->pdev->dev; + control->algo = &smu_v11_0_i2c_algo; + snprintf(control->name, sizeof(control->name), "AMDGPU SMU 0"); + control->lock_ops = &smu_v11_0_i2c_i2c_lock_ops; + control->quirks = &smu_v11_0_i2c_control_quirks; + i2c_set_adapdata(control, smu_i2c); + + adev->pm.ras_eeprom_i2c_bus = &adev->pm.smu_i2c[0].adapter; + adev->pm.fru_eeprom_i2c_bus = &adev->pm.smu_i2c[0].adapter; + + 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_control_fini(struct amdgpu_device *adev) +{ + struct i2c_adapter *control = adev->pm.ras_eeprom_i2c_bus; + + i2c_del_adapter(control); + adev->pm.ras_eeprom_i2c_bus = NULL; + adev->pm.fru_eeprom_i2c_bus = NULL; +} + +/* + * 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_write_data(control, I2C_TARGET_ADDR, data, 6); + + ret = smu_v11_0_i2c_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 |