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linux-zen-desktop/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c

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Initial commit
2023-08-30 17:31:07 +02:00
/*
* 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