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head/sys/dev/e1000/e1000_mac.c
| Show First 20 Lines • Show All 2,186 Lines • ▼ Show 20 Lines | |||||
| * e1000_get_hw_semaphore - Acquire hardware semaphore | * e1000_get_hw_semaphore - Acquire hardware semaphore | ||||
| * @hw: pointer to the HW structure | * @hw: pointer to the HW structure | ||||
| * | * | ||||
| * Acquire the HW semaphore to access the PHY or NVM | * Acquire the HW semaphore to access the PHY or NVM | ||||
| **/ | **/ | ||||
| s32 e1000_get_hw_semaphore(struct e1000_hw *hw) | s32 e1000_get_hw_semaphore(struct e1000_hw *hw) | ||||
| { | { | ||||
| u32 swsm; | u32 swsm; | ||||
| s32 timeout = hw->nvm.word_size + 1; | s32 fw_timeout = hw->nvm.word_size + 1; | ||||
| s32 sw_timeout = hw->nvm.word_size + 1; | |||||
| s32 i = 0; | s32 i = 0; | ||||
| DEBUGFUNC("e1000_get_hw_semaphore"); | DEBUGFUNC("e1000_get_hw_semaphore"); | ||||
| #ifdef notyet | |||||
| /* _82571 */ | /* _82571 */ | ||||
| /* If we have timedout 3 times on trying to acquire | /* If we have timedout 3 times on trying to acquire | ||||
| * the inter-port SMBI semaphore, there is old code | * the inter-port SMBI semaphore, there is old code | ||||
| * operating on the other port, and it is not | * operating on the other port, and it is not | ||||
| * releasing SMBI. Modify the number of times that | * releasing SMBI. Modify the number of times that | ||||
| * we try for the semaphore to interwork with this | * we try for the semaphore to interwork with this | ||||
| * older code. | * older code. | ||||
| */ | */ | ||||
| if (hw->dev_spec._82571.smb_counter > 2) | if (hw->dev_spec._82571.smb_counter > 2) | ||||
| sw_timeout = 1; | sw_timeout = 1; | ||||
| #endif | |||||
| /* Get the SW semaphore */ | /* Get the SW semaphore */ | ||||
| while (i < timeout) { | while (i < sw_timeout) { | ||||
| swsm = E1000_READ_REG(hw, E1000_SWSM); | swsm = E1000_READ_REG(hw, E1000_SWSM); | ||||
| if (!(swsm & E1000_SWSM_SMBI)) | if (!(swsm & E1000_SWSM_SMBI)) | ||||
| break; | break; | ||||
| usec_delay(50); | usec_delay(50); | ||||
| i++; | i++; | ||||
| } | } | ||||
| if (i == timeout) { | if (i == sw_timeout) { | ||||
| #ifdef notyet | DEBUGOUT("Driver can't access device - SMBI bit is set.\n"); | ||||
| /* | hw->dev_spec._82571.smb_counter++; | ||||
| * XXX This sounds more like a driver bug whereby we either | } | ||||
| * recursed accidentally or missed clearing it previously | |||||
| */ | |||||
| /* In rare circumstances, the SW semaphore may already be held | /* In rare circumstances, the SW semaphore may already be held | ||||
| * unintentionally. Clear the semaphore once before giving up. | * unintentionally. Clear the semaphore once before giving up. | ||||
| */ | */ | ||||
| if (hw->dev_spec._82575.clear_semaphore_once) { | if (hw->dev_spec._82575.clear_semaphore_once) { | ||||
| hw->dev_spec._82575.clear_semaphore_once = FALSE; | hw->dev_spec._82575.clear_semaphore_once = FALSE; | ||||
| e1000_put_hw_semaphore_generic(hw); | e1000_put_hw_semaphore(hw); | ||||
| for (i = 0; i < timeout; i++) { | for (i = 0; i < fw_timeout; i++) { | ||||
| swsm = E1000_READ_REG(hw, E1000_SWSM); | swsm = E1000_READ_REG(hw, E1000_SWSM); | ||||
| if (!(swsm & E1000_SWSM_SMBI)) | if (!(swsm & E1000_SWSM_SMBI)) | ||||
| break; | break; | ||||
| usec_delay(50); | usec_delay(50); | ||||
| } | } | ||||
| } | } | ||||
| #endif | |||||
| DEBUGOUT("Driver can't access device - SMBI bit is set.\n"); | |||||
| return -E1000_ERR_NVM; | |||||
| } | |||||
| /* Get the FW semaphore. */ | /* Get the FW semaphore. */ | ||||
| for (i = 0; i < timeout; i++) { | for (i = 0; i < fw_timeout; i++) { | ||||
| swsm = E1000_READ_REG(hw, E1000_SWSM); | swsm = E1000_READ_REG(hw, E1000_SWSM); | ||||
| E1000_WRITE_REG(hw, E1000_SWSM, swsm | E1000_SWSM_SWESMBI); | E1000_WRITE_REG(hw, E1000_SWSM, swsm | E1000_SWSM_SWESMBI); | ||||
| /* Semaphore acquired if bit latched */ | /* Semaphore acquired if bit latched */ | ||||
| if (E1000_READ_REG(hw, E1000_SWSM) & E1000_SWSM_SWESMBI) | if (E1000_READ_REG(hw, E1000_SWSM) & E1000_SWSM_SWESMBI) | ||||
| break; | break; | ||||
| usec_delay(50); | usec_delay(50); | ||||
| } | } | ||||
| if (i == timeout) { | if (i == fw_timeout) { | ||||
| /* Release semaphores */ | /* Release semaphores */ | ||||
| e1000_put_hw_semaphore(hw); | e1000_put_hw_semaphore(hw); | ||||
| DEBUGOUT("Driver can't access the NVM\n"); | DEBUGOUT("Driver can't access the NVM\n"); | ||||
| return -E1000_ERR_NVM; | return -E1000_ERR_NVM; | ||||
| } | } | ||||
| return E1000_SUCCESS; | return E1000_SUCCESS; | ||||
| } | } | ||||
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