arm: socfpga: reset: Add EMAC reset functions

Add functions to reset the EMAC ethernet blocks. We cannot handle
two EMAC ethernet blocks yet, therefore the ifdefs. Once there is
hardware using both EMAC blocks, this ifdef will have to go.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Tom Rini <trini@ti.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Pavel Machek <pavel@denx.de>
Acked-by: Pavel Machek <pavel@denx.de>

arch/arm/cpu/armv7/socfpga/reset_manager.c

@@ -49,3 +49,20 @@ void reset_deassert_peripherals_handoff(void)
 {
 	writel(0, &reset_manager_base->per_mod_reset);
 }
+
+/* Change the reset state for EMAC 0 and EMAC 1 */
+void socfpga_emac_reset(int enable)
+{
+	const void *reset = &reset_manager_base->per_mod_reset;
+
+	if (enable) {
+		setbits_le32(reset, 1 << RSTMGR_PERMODRST_EMAC0_LSB);
+		setbits_le32(reset, 1 << RSTMGR_PERMODRST_EMAC1_LSB);
+	} else {
+#if (CONFIG_EMAC_BASE == SOCFPGA_EMAC0_ADDRESS)
+		clrbits_le32(reset, 1 << RSTMGR_PERMODRST_EMAC0_LSB);
+#elif (CONFIG_EMAC_BASE == SOCFPGA_EMAC1_ADDRESS)
+		clrbits_le32(reset, 1 << RSTMGR_PERMODRST_EMAC1_LSB);
+#endif
+	}
+}

arch/arm/include/asm/arch-socfpga/reset_manager.h

@@ -10,6 +10,7 @@
 void reset_cpu(ulong addr);
 void reset_deassert_peripherals_handoff(void);
 
+void socfpga_emac_reset(int enable);
 void socfpga_watchdog_reset(void);
 
 struct socfpga_reset_manager {
@@ -29,6 +30,8 @@ struct socfpga_reset_manager {
 #define RSTMGR_CTRL_SWWARMRSTREQ_LSB 1
 #endif
 
+#define RSTMGR_PERMODRST_EMAC0_LSB	0
+#define RSTMGR_PERMODRST_EMAC1_LSB	1
 #define RSTMGR_PERMODRST_L4WD0_LSB	6
 
 #endif /* _RESET_MANAGER_H_ */