stmmac: intel: Adding ref clock 1us tic for LPI cntr

Adding reference clock (1us tic) for all LPI timer on Intel platforms.
The reference clock is derived from ptp clk. This also enables all LPI
counter.
Signed-off-by: Rusaimi Amira Ruslan <rusaimi.amira.rusaimi@intel.com>
Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/dwmac-intel-plat.c

@@ -11,6 +11,7 @@
 #include <linux/platform_device.h>
 #include <linux/stmmac.h>
 
+#include "dwmac4.h"
 #include "stmmac.h"
 #include "stmmac_platform.h"
 
@@ -146,6 +147,14 @@ static int intel_eth_plat_probe(struct platform_device *pdev)
 	}
 
 	plat_dat->bsp_priv = dwmac;
+	plat_dat->eee_usecs_rate = plat_dat->clk_ptp_rate;
+
+	if (plat_dat->eee_usecs_rate > 0) {
+		u32 tx_lpi_usec;
+
+		tx_lpi_usec = (plat_dat->eee_usecs_rate / 1000000) - 1;
+		writel(tx_lpi_usec, stmmac_res.addr + GMAC_1US_TIC_COUNTER);
+	}
 
 	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
 	if (ret) {

drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c

@@ -6,6 +6,7 @@
 #include <linux/pci.h>
 #include <linux/dmi.h>
 #include "dwmac-intel.h"
+#include "dwmac4.h"
 #include "stmmac.h"
 
 struct intel_priv_data {
@@ -295,6 +296,7 @@ static int intel_mgbe_common_data(struct pci_dev *pdev,
 	plat->axi->axi_blen[2] = 16;
 
 	plat->ptp_max_adj = plat->clk_ptp_rate;
+	plat->eee_usecs_rate = plat->clk_ptp_rate;
 
 	/* Set system clock */
 	plat->stmmac_clk = clk_register_fixed_rate(&pdev->dev,
@@ -623,6 +625,13 @@ static int intel_eth_pci_probe(struct pci_dev *pdev,
 	if (ret)
 		return ret;
 
+	if (plat->eee_usecs_rate > 0) {
+		u32 tx_lpi_usec;
+
+		tx_lpi_usec = (plat->eee_usecs_rate / 1000000) - 1;
+		writel(tx_lpi_usec, res.addr + GMAC_1US_TIC_COUNTER);
+	}
+
 	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
 	if (ret < 0)
 		return ret;

include/linux/stmmac.h

@@ -200,5 +200,6 @@ struct plat_stmmacenet_data {
 	int has_xgmac;
 	bool vlan_fail_q_en;
 	u8 vlan_fail_q;
+	unsigned int eee_usecs_rate;
 };
 #endif