[PATCH] net: stmmac: Add SMC support for EMAC System Manager register
From: Ooi, Joyce
Date: Tue Feb 12 2019 - 11:25:11 EST
As there is restriction to access to EMAC System Manager registers in
the kernel for Intel Stratix10, the use of SMC calls are required and
added in dwmac-socfpga driver.
Signed-off-by: Ooi, Joyce <joyce.ooi@xxxxxxxxx>
---
.../net/ethernet/stmicro/stmmac/dwmac-socfpga.c | 101 ++++++++++++++++++++
1 files changed, 101 insertions(+), 0 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
index 5b3b06a..55cce97 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
@@ -15,6 +15,10 @@
* Adopted from dwmac-sti.c
*/
+#if defined CONFIG_HAVE_ARM_SMCCC && defined CONFIG_ARCH_STRATIX10
+#include <linux/arm-smccc.h>
+#include <linux/firmware/intel/stratix10-smc.h>
+#endif
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/of_address.h>
@@ -52,6 +56,9 @@ struct socfpga_dwmac {
int interface;
u32 reg_offset;
u32 reg_shift;
+#if defined CONFIG_HAVE_ARM_SMCCC && defined CONFIG_ARCH_STRATIX10
+ u32 sysmgr_reg;
+#endif
struct device *dev;
struct regmap *sys_mgr_base_addr;
struct reset_control *stmmac_rst;
@@ -61,6 +68,63 @@ struct socfpga_dwmac {
struct tse_pcs pcs;
};
+#if defined CONFIG_HAVE_ARM_SMCCC && defined CONFIG_ARCH_STRATIX10
+/**************** Stratix 10 EMAC Memory Controller Functions ************/
+
+/* s10_protected_reg_write
+ * Write to a protected SMC register.
+ * @context: Not used
+ * @reg: Address of register
+ * @value: Value to write
+ * Return: INTEL_SIP_SMC_STATUS_OK (0) on success
+ * INTEL_SIP_SMC_REG_ERROR on error
+ * INTEL_SIP_SMC_RETURN_UNKNOWN_FUNCTION if not supported
+ */
+static int s10_protected_reg_write(void *context, unsigned int reg,
+ unsigned int val)
+{
+ struct arm_smccc_res result;
+
+ arm_smccc_smc(INTEL_SIP_SMC_REG_WRITE, reg, val, 0, 0,
+ 0, 0, 0, &result);
+
+ return (int)result.a0;
+}
+
+/* s10_protected_reg_read
+ * Read the status of a protected SMC register
+ * @context: Not used
+ * @reg: Address of register
+ * @value: Value read.
+ * Return: INTEL_SIP_SMC_STATUS_OK (0) on success
+ * INTEL_SIP_SMC_REG_ERROR on error
+ * INTEL_SIP_SMC_RETURN_UNKNOWN_FUNCTION if not supported
+ */
+static int s10_protected_reg_read(void *context, unsigned int reg,
+ unsigned int *val)
+{
+ struct arm_smccc_res result;
+
+ arm_smccc_smc(INTEL_SIP_SMC_REG_READ, reg, 0, 0, 0,
+ 0, 0, 0, &result);
+
+ *val = (unsigned int)result.a1;
+
+ return (int)result.a0;
+}
+
+static const struct regmap_config s10_emac_regmap_cfg = {
+ .name = "s10_emac",
+ .reg_bits = 32,
+ .val_bits = 32,
+ .max_register = 0xffffffff,
+ .reg_read = s10_protected_reg_read,
+ .reg_write = s10_protected_reg_write,
+ .use_single_read = true,
+ .use_single_write = true,
+};
+#endif
+
static void socfpga_dwmac_fix_mac_speed(void *priv, unsigned int speed)
{
struct socfpga_dwmac *dwmac = (struct socfpga_dwmac *)priv;
@@ -105,20 +169,43 @@ static int socfpga_dwmac_parse_data(struct socfpga_dwmac *dwmac, struct device *
struct device_node *np = dev->of_node;
struct regmap *sys_mgr_base_addr;
u32 reg_offset, reg_shift;
+#if defined CONFIG_HAVE_ARM_SMCCC && defined CONFIG_ARCH_STRATIX10
+ u32 sysmgr_reg = 0;
+#endif
int ret, index;
struct device_node *np_splitter = NULL;
struct device_node *np_sgmii_adapter = NULL;
+#if defined CONFIG_HAVE_ARM_SMCCC && defined CONFIG_ARCH_STRATIX10
+ struct device_node *np_sysmgr = NULL;
+#endif
struct resource res_splitter;
struct resource res_tse_pcs;
struct resource res_sgmii_adapter;
dwmac->interface = of_get_phy_mode(np);
+#if defined CONFIG_HAVE_ARM_SMCCC && defined CONFIG_ARCH_STRATIX10
+ sys_mgr_base_addr = devm_regmap_init(dev, NULL, (void *)dwmac,
+ &s10_emac_regmap_cfg);
+ if (IS_ERR(sys_mgr_base_addr))
+ return PTR_ERR(sys_mgr_base_addr);
+
+ np_sysmgr = of_parse_phandle(np, "altr,sysmgr-syscon", 0);
+ if (np_sysmgr) {
+ ret = of_property_read_u32_index(np_sysmgr, "reg", 0,
+ &sysmgr_reg);
+ if (ret) {
+ dev_info(dev, "Could not read sysmgr register address\n");
+ return -EINVAL;
+ }
+ }
+#else
sys_mgr_base_addr = syscon_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon");
if (IS_ERR(sys_mgr_base_addr)) {
dev_info(dev, "No sysmgr-syscon node found\n");
return PTR_ERR(sys_mgr_base_addr);
}
+#endif
ret = of_property_read_u32_index(np, "altr,sysmgr-syscon", 1, ®_offset);
if (ret) {
@@ -222,6 +309,9 @@ static int socfpga_dwmac_parse_data(struct socfpga_dwmac *dwmac, struct device *
dwmac->reg_offset = reg_offset;
dwmac->reg_shift = reg_shift;
dwmac->sys_mgr_base_addr = sys_mgr_base_addr;
+#if defined CONFIG_HAVE_ARM_SMCCC && defined CONFIG_ARCH_STRATIX10
+ dwmac->sysmgr_reg = sysmgr_reg;
+#endif
dwmac->dev = dev;
of_node_put(np_sgmii_adapter);
@@ -238,6 +328,9 @@ static int socfpga_dwmac_set_phy_mode(struct socfpga_dwmac *dwmac)
int phymode = dwmac->interface;
u32 reg_offset = dwmac->reg_offset;
u32 reg_shift = dwmac->reg_shift;
+#if defined CONFIG_HAVE_ARM_SMCCC && defined CONFIG_ARCH_STRATIX10
+ u32 sysmgr_reg = dwmac->sysmgr_reg;
+#endif
u32 ctrl, val, module;
switch (phymode) {
@@ -266,7 +359,11 @@ static int socfpga_dwmac_set_phy_mode(struct socfpga_dwmac *dwmac)
reset_control_assert(dwmac->stmmac_ocp_rst);
reset_control_assert(dwmac->stmmac_rst);
+#if defined CONFIG_HAVE_ARM_SMCCC && defined CONFIG_ARCH_STRATIX10
+ regmap_read(sys_mgr_base_addr, sysmgr_reg + reg_offset, &ctrl);
+#else
regmap_read(sys_mgr_base_addr, reg_offset, &ctrl);
+#endif
ctrl &= ~(SYSMGR_EMACGRP_CTRL_PHYSEL_MASK << reg_shift);
ctrl |= val << reg_shift;
@@ -284,7 +381,11 @@ static int socfpga_dwmac_set_phy_mode(struct socfpga_dwmac *dwmac)
ctrl &= ~(SYSMGR_EMACGRP_CTRL_PTP_REF_CLK_MASK << (reg_shift / 2));
}
+#if defined CONFIG_HAVE_ARM_SMCCC && defined CONFIG_ARCH_STRATIX10
+ regmap_write(sys_mgr_base_addr, sysmgr_reg + reg_offset, ctrl);
+#else
regmap_write(sys_mgr_base_addr, reg_offset, ctrl);
+#endif
/* Deassert reset for the phy configuration to be sampled by
* the enet controller, and operation to start in requested mode
--
1.7.1