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[U-Boot,35/51] arm: socfpga: reset: Add function to reset FPGA bridges

Message ID 1411305152-11690-8-git-send-email-marex@denx.de
State Superseded
Delegated to: Marek Vasut
Headers show

Commit Message

Marek Vasut Sept. 21, 2014, 1:12 p.m. UTC 
Add function to enable and disable FPGA bridges. This code is used
by the FPGA manager to disable the bridges before programming the
FPGA and will later be also used by the initialization code for the
chip to put the chip into well defined state during startup.

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        | 38 +++++++++++++++++++++++
 arch/arm/include/asm/arch-socfpga/reset_manager.h |  2 ++
 2 files changed, 40 insertions(+)
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Patch

diff --git a/arch/arm/cpu/armv7/socfpga/reset_manager.c b/arch/arm/cpu/armv7/socfpga/reset_manager.c
index badc569..1d3a95d 100644
--- a/arch/arm/cpu/armv7/socfpga/reset_manager.c
+++ b/arch/arm/cpu/armv7/socfpga/reset_manager.c
@@ -8,6 +8,7 @@ 
 #include <common.h>
 #include <asm/io.h>
 #include <asm/arch/reset_manager.h>
+#include <asm/arch/fpga_manager.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -50,6 +51,43 @@  void reset_deassert_peripherals_handoff(void)
 	writel(0, &reset_manager_base->per_mod_reset);
 }
 
+#if defined(CONFIG_SOCFPGA_VIRTUAL_TARGET)
+void socfpga_bridges_reset(int enable)
+{
+	/* For SoCFPGA-VT, this is NOP. */
+}
+#else
+
+#define L3REGS_REMAP_LWHPS2FPGA_MASK	0x10
+#define L3REGS_REMAP_HPS2FPGA_MASK	0x08
+#define L3REGS_REMAP_OCRAM_MASK		0x01
+
+void socfpga_bridges_reset(int enable)
+{
+	const uint32_t l3mask = L3REGS_REMAP_LWHPS2FPGA_MASK |
+				L3REGS_REMAP_HPS2FPGA_MASK |
+				L3REGS_REMAP_OCRAM_MASK;
+
+	if (enable) {
+		/* brdmodrst */
+		writel(0xffffffff, &reset_manager_base->brg_mod_reset);
+	} else {
+		/* Check signal from FPGA. */
+		if (fpgamgr_poll_fpga_ready()) {
+			/* FPGA not ready. Wait for watchdog timeout. */
+			printf("%s: fpga not ready, hanging.\n", __func__);
+			hang();
+		}
+
+		/* brdmodrst */
+		writel(0, &reset_manager_base->brg_mod_reset);
+
+		/* Remap the bridges into memory map */
+		writel(l3mask, SOCFPGA_L3REGS_ADDRESS);
+	}
+}
+#endif
+
 /* Change the reset state for EMAC 0 and EMAC 1 */
 void socfpga_emac_reset(int enable)
 {
diff --git a/arch/arm/include/asm/arch-socfpga/reset_manager.h b/arch/arm/include/asm/arch-socfpga/reset_manager.h
index 3c5ab40..1857b80 100644
--- a/arch/arm/include/asm/arch-socfpga/reset_manager.h
+++ b/arch/arm/include/asm/arch-socfpga/reset_manager.h
@@ -10,6 +10,8 @@ 
 void reset_cpu(ulong addr);
 void reset_deassert_peripherals_handoff(void);
 
+void socfpga_bridges_reset(int enable);
+
 void socfpga_emac_reset(int enable);
 void socfpga_watchdog_reset(void);