[PATCH net-next v4 08/11] stmmac: intel: configure SerDes according to the interface mode

Choong Yong Liang
2024-01-29T13:06:17Z

From: "Tan, Tee Min" <tee.min.tan@linux.intel.com>

Intel platform will configure the SerDes through PMC api based on the
provided interface mode.

This patch adds several new functions below:-
- intel_tsn_interface_is_available(): This new function reads FIA lane
ownership registers and common lane registers through IPC commands
to know which lane the mGbE port is assigned to.
- intel_config_serdes(): To configure the SerDes based on the assigned
lane and latest interface mode, it sends IPC command to the PMC through
PMC driver/API. The PMC acts as a proxy for R/W on behalf of the driver.
- intel_set_reg_access(): Set the register access to the available TSN
interface.

Signed-off-by: Tan, Tee Min <tee.min.tan@linux.intel.com>
Signed-off-by: Choong Yong Liang <yong.liang.choong@linux.intel.com>
---
drivers/net/ethernet/stmicro/stmmac/Kconfig | 1 +
.../net/ethernet/stmicro/stmmac/dwmac-intel.c | 113 +++++++++++++++++-
.../net/ethernet/stmicro/stmmac/dwmac-intel.h | 75 ++++++++++++
3 files changed, 188 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 85dcda51df05..be423fb2b46c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -273,6 +273,7 @@ config DWMAC_INTEL
default X86
depends on X86 && STMMAC_ETH && PCI
depends on COMMON_CLK
+ select INTEL_PMC_IPC
help
This selects the Intel platform specific bus support for the
stmmac driver. This driver is used for Intel Quark/EHL/TGL.
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
index 5110af776c8f..ddd96b18ce87 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
@@ -5,6 +5,7 @@
#include <linux/clk-provider.h>
#include <linux/pci.h>
#include <linux/dmi.h>
+#include <linux/platform_data/x86/intel_pmc_ipc.h>
#include "dwmac-intel.h"
#include "dwmac4.h"
#include "stmmac.h"
@@ -14,6 +15,9 @@ struct intel_priv_data {
int mdio_adhoc_addr; /* mdio address for serdes & etc */
unsigned long crossts_adj;
bool is_pse;
+ const int *tsn_lane_registers;
+ int max_tsn_lane_registers;
+ int pid_modphy;
};

/* This struct is used to associate PCI Function of MAC controller on a board,
@@ -93,7 +97,7 @@ static int intel_serdes_powerup(struct net_device *ndev, void *priv_data)
data &= ~SERDES_RATE_MASK;
data &= ~SERDES_PCLK_MASK;

- if (priv->plat->max_speed == 2500)
+ if (priv->plat->phy_interface == PHY_INTERFACE_MODE_2500BASEX)
data |= SERDES_RATE_PCIE_GEN2 << SERDES_RATE_PCIE_SHIFT |
SERDES_PCLK_37p5MHZ << SERDES_PCLK_SHIFT;
else
@@ -447,6 +451,103 @@ static unsigned int intel_get_pcs_neg_mode(phy_interface_t interface,
return neg_mode;
}

+static bool intel_tsn_interface_is_available(struct net_device *ndev,
+ struct intel_priv_data *intel_priv)
+{
+ struct stmmac_priv *priv = netdev_priv(ndev);
+ struct pmc_ipc_cmd tmp = {0};
+ u32 rbuf[4] = {0};
+ int ret, i, j;
+
+ if (priv->plat->serdes_powerup) {
+ tmp.cmd = IPC_SOC_REGISTER_ACCESS;
+ tmp.sub_cmd = IPC_SOC_SUB_CMD_READ;
+
+ for (i = 0; i < 5; i++) {
+ tmp.wbuf[0] = R_PCH_FIA_15_PCR_LOS1_REG_BASE + i;
+
+ ret = intel_pmc_ipc(&tmp, rbuf);
+ if (ret < 0) {
+ netdev_info(priv->dev,
+ "Failed to read from PMC.\n");
+ return false;
+ }
+
+ for (j = 0; j <= intel_priv->max_tsn_lane_registers; j++)
+ if ((rbuf[0] >>
+ (4 * (intel_priv->tsn_lane_registers[j] % 8)) &
+ B_PCH_FIA_PCR_L0O) == 0xB)
+ return true;
+ }
+ }
+ return false;
+}
+
+static int intel_set_reg_access(const struct pmc_serdes_regs *regs, int max_regs)
+{
+ int ret = 0, i;
+
+ for (i = 0; i < max_regs; i++) {
+ struct pmc_ipc_cmd tmp = {0};
+ u32 buf[4] = {0};
+
+ tmp.cmd = IPC_SOC_REGISTER_ACCESS;
+ tmp.sub_cmd = IPC_SOC_SUB_CMD_WRITE;
+ tmp.wbuf[0] = (u32)regs[i].index;
+ tmp.wbuf[1] = regs[i].val;
+
+ ret = intel_pmc_ipc(&tmp, buf);
+ if (ret < 0)
+ return ret;
+ }
+
+ return ret;
+}
+
+static int intel_config_serdes(struct net_device *ndev,
+ void *intel_data,
+ phy_interface_t interface)
+{
+ struct intel_priv_data *intel_priv = intel_data;
+ struct stmmac_priv *priv = netdev_priv(ndev);
+ int ret = 0;
+
+ if (!intel_tsn_interface_is_available(ndev, intel_priv)) {
+ netdev_info(priv->dev,
+ "No TSN interface available to set the registers.\n");
+ goto pmc_read_error;
+ }
+
+ if (intel_priv->pid_modphy == PID_MODPHY1) {
+ if (interface == PHY_INTERFACE_MODE_2500BASEX) {
+ ret = intel_set_reg_access(pid_modphy1_2p5g_regs,
+ ARRAY_SIZE(pid_modphy1_2p5g_regs));
+ } else {
+ ret = intel_set_reg_access(pid_modphy1_1g_regs,
+ ARRAY_SIZE(pid_modphy1_1g_regs));
+ }
+ } else {
+ if (interface == PHY_INTERFACE_MODE_2500BASEX) {
+ ret = intel_set_reg_access(pid_modphy3_2p5g_regs,
+ ARRAY_SIZE(pid_modphy3_2p5g_regs));
+ } else {
+ ret = intel_set_reg_access(pid_modphy3_1g_regs,
+ ARRAY_SIZE(pid_modphy3_1g_regs));
+ }
+ }
+
+ priv->plat->phy_interface = interface;
+
+ if (ret < 0)
+ goto pmc_read_error;
+
+pmc_read_error:
+ intel_serdes_powerdown(ndev, intel_priv);
+ intel_serdes_powerup(ndev, intel_priv);
+
+ return ret;
+}
+
static void common_default_data(struct plat_stmmacenet_data *plat)
{
plat->clk_csr = 2; /* clk_csr_i = 20-35MHz & MDC = clk_csr_i/16 */
@@ -622,6 +723,16 @@ static int intel_mgbe_common_data(struct pci_dev *pdev,
plat->mdio_bus_data->xpcs_an_inband = true;
}

+ /* When the platform is able to switch between PHY_INTERFACE_MODE_SGMII
+ * and PHY_INTERFACE_MODE_2500BASEX interfaces, we clear xpcs_an_inband
+ * for PHY_INTERFACE_MODE_2500BASEX interface
+ */
+ if (plat->phy_interface == PHY_INTERFACE_MODE_SGMII &&
+ plat->max_speed == 2500) {
+ plat->mdio_bus_data->xpcs_an_inband = false;
+ plat->mdio_bus_data->allow_switch_interface = true;
+ }
+
/* For fixed-link setup, we clear xpcs_an_inband */
if (is_fixed_link(pdev))
plat->mdio_bus_data->xpcs_an_inband = false;
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.h b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.h
index 0a37987478c1..79c35ba969ea 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.h
@@ -50,4 +50,79 @@
#define PCH_PTP_CLK_FREQ_19_2MHZ (GMAC_GPO0)
#define PCH_PTP_CLK_FREQ_200MHZ (0)

+#define PID_MODPHY1 0xAA
+#define PID_MODPHY3 0xA8
+
+#if IS_ENABLED(CONFIG_INTEL_PMC_IPC)
+struct pmc_serdes_regs {
+ u8 index;
+ u32 val;
+};
+
+/* Modphy Register index */
+#define R_PCH_FIA_15_PCR_LOS1_REG_BASE 8
+#define R_PCH_FIA_15_PCR_LOS2_REG_BASE 9
+#define R_PCH_FIA_15_PCR_LOS3_REG_BASE 10
+#define R_PCH_FIA_15_PCR_LOS4_REG_BASE 11
+#define R_PCH_FIA_15_PCR_LOS5_REG_BASE 12
+#define B_PCH_FIA_PCR_L0O GENMASK(3, 0)
+#define PID_MODPHY1_B_MODPHY_PCR_LCPLL_DWORD0 13
+#define PID_MODPHY1_N_MODPHY_PCR_LCPLL_DWORD2 14
+#define PID_MODPHY1_N_MODPHY_PCR_LCPLL_DWORD7 15
+#define PID_MODPHY1_N_MODPHY_PCR_LPPLL_DWORD10 16
+#define PID_MODPHY1_N_MODPHY_PCR_CMN_ANA_DWORD30 17
+#define PID_MODPHY3_B_MODPHY_PCR_LCPLL_DWORD0 18
+#define PID_MODPHY3_N_MODPHY_PCR_LCPLL_DWORD2 19
+#define PID_MODPHY3_N_MODPHY_PCR_LCPLL_DWORD7 20
+#define PID_MODPHY3_N_MODPHY_PCR_LPPLL_DWORD10 21
+#define PID_MODPHY3_N_MODPHY_PCR_CMN_ANA_DWORD30 22
+
+#define B_MODPHY_PCR_LCPLL_DWORD0_1G 0x46AAAA41
+#define N_MODPHY_PCR_LCPLL_DWORD2_1G 0x00000139
+#define N_MODPHY_PCR_LCPLL_DWORD7_1G 0x002A0003
+#define N_MODPHY_PCR_LPPLL_DWORD10_1G 0x00170008
+#define N_MODPHY_PCR_CMN_ANA_DWORD30_1G 0x0000D4AC
+#define B_MODPHY_PCR_LCPLL_DWORD0_2P5G 0x58555551
+#define N_MODPHY_PCR_LCPLL_DWORD2_2P5G 0x0000012D
+#define N_MODPHY_PCR_LCPLL_DWORD7_2P5G 0x001F0003
+#define N_MODPHY_PCR_LPPLL_DWORD10_2P5G 0x00170008
+#define N_MODPHY_PCR_CMN_ANA_DWORD30_2P5G 0x8200ACAC
+
+static const struct pmc_serdes_regs pid_modphy3_1g_regs[] = {
+ { PID_MODPHY3_B_MODPHY_PCR_LCPLL_DWORD0, B_MODPHY_PCR_LCPLL_DWORD0_1G },
+ { PID_MODPHY3_N_MODPHY_PCR_LCPLL_DWORD2, N_MODPHY_PCR_LCPLL_DWORD2_1G },
+ { PID_MODPHY3_N_MODPHY_PCR_LCPLL_DWORD7, N_MODPHY_PCR_LCPLL_DWORD7_1G },
+ { PID_MODPHY3_N_MODPHY_PCR_LPPLL_DWORD10, N_MODPHY_PCR_LPPLL_DWORD10_1G },
+ { PID_MODPHY3_N_MODPHY_PCR_CMN_ANA_DWORD30, N_MODPHY_PCR_CMN_ANA_DWORD30_1G },
+ {}
+};
+
+static const struct pmc_serdes_regs pid_modphy3_2p5g_regs[] = {
+ { PID_MODPHY3_B_MODPHY_PCR_LCPLL_DWORD0, B_MODPHY_PCR_LCPLL_DWORD0_2P5G },
+ { PID_MODPHY3_N_MODPHY_PCR_LCPLL_DWORD2, N_MODPHY_PCR_LCPLL_DWORD2_2P5G },
+ { PID_MODPHY3_N_MODPHY_PCR_LCPLL_DWORD7, N_MODPHY_PCR_LCPLL_DWORD7_2P5G },
+ { PID_MODPHY3_N_MODPHY_PCR_LPPLL_DWORD10, N_MODPHY_PCR_LPPLL_DWORD10_2P5G },
+ { PID_MODPHY3_N_MODPHY_PCR_CMN_ANA_DWORD30, N_MODPHY_PCR_CMN_ANA_DWORD30_2P5G },
+ {}
+};
+
+static const struct pmc_serdes_regs pid_modphy1_1g_regs[] = {
+ { PID_MODPHY1_B_MODPHY_PCR_LCPLL_DWORD0, B_MODPHY_PCR_LCPLL_DWORD0_1G },
+ { PID_MODPHY1_N_MODPHY_PCR_LCPLL_DWORD2, N_MODPHY_PCR_LCPLL_DWORD2_1G },
+ { PID_MODPHY1_N_MODPHY_PCR_LCPLL_DWORD7, N_MODPHY_PCR_LCPLL_DWORD7_1G },
+ { PID_MODPHY1_N_MODPHY_PCR_LPPLL_DWORD10, N_MODPHY_PCR_LPPLL_DWORD10_1G },
+ { PID_MODPHY1_N_MODPHY_PCR_CMN_ANA_DWORD30, N_MODPHY_PCR_CMN_ANA_DWORD30_1G },
+ {}
+};
+
+static const struct pmc_serdes_regs pid_modphy1_2p5g_regs[] = {
+ { PID_MODPHY1_B_MODPHY_PCR_LCPLL_DWORD0, B_MODPHY_PCR_LCPLL_DWORD0_2P5G },
+ { PID_MODPHY1_N_MODPHY_PCR_LCPLL_DWORD2, N_MODPHY_PCR_LCPLL_DWORD2_2P5G },
+ { PID_MODPHY1_N_MODPHY_PCR_LCPLL_DWORD7, N_MODPHY_PCR_LCPLL_DWORD7_2P5G },
+ { PID_MODPHY1_N_MODPHY_PCR_LPPLL_DWORD10, N_MODPHY_PCR_LPPLL_DWORD10_2P5G },
+ { PID_MODPHY1_N_MODPHY_PCR_CMN_ANA_DWORD30, N_MODPHY_PCR_CMN_ANA_DWORD30_2P5G },
+ {}
+};
+#endif /* CONFIG_INTEL_PMC_IPC */
+
#endif /* __DWMAC_INTEL_H__ */
--
2.34.1