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e1000e: helper functions for accessing EMI registers

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The Extended Management Interface (EMI) registers are accessed by first
writing the EMI register offset to the EMI_ADDR regiter and then either
reading or writing the data to/from the EMI_DATA register.  Add helper
functions for performing these steps and convert existing EMI register
accesses accordingly.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Bruce Allan 2012-12-05 06:25:58 +00:00 committed by Jeff Kirsher
parent 1cc7a3a14f
commit 4ddc48a9a5
1 changed files with 65 additions and 19 deletions
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84
drivers/net/ethernet/intel/e1000e/ich8lan.c
View file

@ -153,7 +153,7 @@
#define I82579_LPI_CTRL_ENABLE_MASK 0x6000
#define I82579_LPI_CTRL_FORCE_PLL_LOCK_COUNT 0x80
/* EMI Registers */
/* Extended Management Interface (EMI) Registers */
#define I82579_EMI_ADDR 0x10
#define I82579_EMI_DATA 0x11
#define I82579_LPI_UPDATE_TIMER 0x4805 /* in 40ns units + 40 ns base value */
@ -788,6 +788,58 @@ static s32 e1000_init_mac_params_ich8lan(struct e1000_hw *hw)
return 0;
}
/**
* __e1000_access_emi_reg_locked - Read/write EMI register
* @hw: pointer to the HW structure
* @addr: EMI address to program
* @data: pointer to value to read/write from/to the EMI address
* @read: boolean flag to indicate read or write
*
* This helper function assumes the SW/FW/HW Semaphore is already acquired.
**/
static s32 __e1000_access_emi_reg_locked(struct e1000_hw *hw, u16 address,
u16 *data, bool read)
{
s32 ret_val = 0;
ret_val = e1e_wphy_locked(hw, I82579_EMI_ADDR, address);
if (ret_val)
return ret_val;
if (read)
ret_val = e1e_rphy_locked(hw, I82579_EMI_DATA, data);
else
ret_val = e1e_wphy_locked(hw, I82579_EMI_DATA, *data);
return ret_val;
}
/**
* e1000_read_emi_reg_locked - Read Extended Management Interface register
* @hw: pointer to the HW structure
* @addr: EMI address to program
* @data: value to be read from the EMI address
*
* Assumes the SW/FW/HW Semaphore is already acquired.
**/
static s32 e1000_read_emi_reg_locked(struct e1000_hw *hw, u16 addr, u16 *data)
{
return __e1000_access_emi_reg_locked(hw, addr, data, true);
}
/**
* e1000_write_emi_reg_locked - Write Extended Management Interface register
* @hw: pointer to the HW structure
* @addr: EMI address to program
* @data: value to be written to the EMI address
*
* Assumes the SW/FW/HW Semaphore is already acquired.
**/
static s32 e1000_write_emi_reg_locked(struct e1000_hw *hw, u16 addr, u16 data)
{
return __e1000_access_emi_reg_locked(hw, addr, &data, false);
}
/**
* e1000_set_eee_pchlan - Enable/disable EEE support
* @hw: pointer to the HW structure
@ -823,11 +875,11 @@ static s32 e1000_set_eee_pchlan(struct e1000_hw *hw)
ret_val = hw->phy.ops.acquire(hw);
if (ret_val)
return ret_val;
ret_val = e1e_wphy_locked(hw, I82579_EMI_ADDR,
I217_EEE_LP_ABILITY);
ret_val = e1000_read_emi_reg_locked(hw,
I217_EEE_LP_ABILITY,
&dev_spec->eee_lp_ability);
if (ret_val)
goto release;
e1e_rphy_locked(hw, I82579_EMI_DATA, &dev_spec->eee_lp_ability);
/* EEE is not supported in 100Half, so ignore partner's EEE
* in 100 ability if full-duplex is not advertised.
@ -1987,18 +2039,12 @@ static s32 e1000_lv_phy_workarounds_ich8lan(struct e1000_hw *hw)
ret_val = hw->phy.ops.acquire(hw);
if (ret_val)
return ret_val;
ret_val = e1e_wphy_locked(hw, I82579_EMI_ADDR, I82579_MSE_THRESHOLD);
if (ret_val)
goto release;
/* set MSE higher to enable link to stay up when noise is high */
ret_val = e1e_wphy_locked(hw, I82579_EMI_DATA, 0x0034);
if (ret_val)
goto release;
ret_val = e1e_wphy_locked(hw, I82579_EMI_ADDR, I82579_MSE_LINK_DOWN);
ret_val = e1000_write_emi_reg_locked(hw, I82579_MSE_THRESHOLD, 0x0034);
if (ret_val)
goto release;
/* drop link after 5 times MSE threshold was reached */
ret_val = e1e_wphy_locked(hw, I82579_EMI_DATA, 0x0005);
ret_val = e1000_write_emi_reg_locked(hw, I82579_MSE_LINK_DOWN, 0x0005);
release:
hw->phy.ops.release(hw);
@ -2172,10 +2218,9 @@ static s32 e1000_post_phy_reset_ich8lan(struct e1000_hw *hw)
ret_val = hw->phy.ops.acquire(hw);
if (ret_val)
return ret_val;
ret_val = e1e_wphy_locked(hw, I82579_EMI_ADDR,
I82579_LPI_UPDATE_TIMER);
if (!ret_val)
ret_val = e1e_wphy_locked(hw, I82579_EMI_DATA, 0x1387);
ret_val = e1000_write_emi_reg_locked(hw,
I82579_LPI_UPDATE_TIMER,
0x1387);
hw->phy.ops.release(hw);
}
@ -4013,11 +4058,12 @@ void e1000_suspend_workarounds_ich8lan(struct e1000_hw *hw)
if (!dev_spec->eee_disable) {
u16 eee_advert;
ret_val = e1e_wphy_locked(hw, I82579_EMI_ADDR,
I217_EEE_ADVERTISEMENT);
ret_val =
e1000_read_emi_reg_locked(hw,
I217_EEE_ADVERTISEMENT,
&eee_advert);
if (ret_val)
goto release;
e1e_rphy_locked(hw, I82579_EMI_DATA, &eee_advert);
/* Disable LPLU if both link partners support 100BaseT
* EEE and 100Full is advertised on both ends of the