arm: socfpga: fpga: Add SoCFPGA FPGA programming interface

Add code necessary to program the FPGA part of SoCFPGA from U-Boot
with an RBF blob. This patch also integrates the code into the
FPGA driver framework in U-Boot so it can be used via the 'fpga'
command.

Signed-off-by: Pavel Machek <[email protected]>
Signed-off-by: Marek Vasut <[email protected]>
Cc: Chin Liang See <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Albert Aribaud <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: Wolfgang Denk <[email protected]>
Cc: Pavel Machek <[email protected]>

V2: Move the not-CPU specific stuff into drivers/fpga/ and base
    this on the cleaned up altera FPGA support.

arch/arm/cpu/armv7/socfpga/Makefile

@@ -8,5 +8,6 @@
 #
 
 obj-y	:= lowlevel_init.o
-obj-y	+= misc.o timer.o reset_manager.o system_manager.o clock_manager.o
+obj-y	+= misc.o timer.o reset_manager.o system_manager.o clock_manager.o \
+	   fpga_manager.o
 obj-$(CONFIG_SPL_BUILD) += spl.o freeze_controller.o scan_manager.o

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

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2012 Altera Corporation <www.altera.com>
+ * All rights reserved.
+ *
+ * This file contains only support functions used also by the SoCFPGA
+ * platform code, the real meat is located in drivers/fpga/socfpga.c .
+ *
+ * SPDX-License-Identifier:	BSD-3-Clause
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/arch/fpga_manager.h>
+#include <asm/arch/reset_manager.h>
+#include <asm/arch/system_manager.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Timeout count */
+#define FPGA_TIMEOUT_CNT		0x1000000
+
+static struct socfpga_fpga_manager *fpgamgr_regs =
+	(struct socfpga_fpga_manager *)SOCFPGA_FPGAMGRREGS_ADDRESS;
+
+/* Check whether FPGA Init_Done signal is high */
+static int is_fpgamgr_initdone_high(void)
+{
+	unsigned long val;
+
+	val = readl(&fpgamgr_regs->gpio_ext_porta);
+	return val & FPGAMGRREGS_MON_GPIO_EXT_PORTA_ID_MASK;
+}
+
+/* Get the FPGA mode */
+int fpgamgr_get_mode(void)
+{
+	unsigned long val;
+
+	val = readl(&fpgamgr_regs->stat);
+	return val & FPGAMGRREGS_STAT_MODE_MASK;
+}
+
+/* Check whether FPGA is ready to be accessed */
+int fpgamgr_test_fpga_ready(void)
+{
+	/* Check for init done signal */
+	if (!is_fpgamgr_initdone_high())
+		return 0;
+
+	/* Check again to avoid false glitches */
+	if (!is_fpgamgr_initdone_high())
+		return 0;
+
+	if (fpgamgr_get_mode() != FPGAMGRREGS_MODE_USERMODE)
+		return 0;
+
+	return 1;
+}
+
+/* Poll until FPGA is ready to be accessed or timeout occurred */
+int fpgamgr_poll_fpga_ready(void)
+{
+	unsigned long i;
+
+	/* If FPGA is blank, wait till WD invoke warm reset */
+	for (i = 0; i < FPGA_TIMEOUT_CNT; i++) {
+		/* check for init done signal */
+		if (!is_fpgamgr_initdone_high())
+			continue;
+		/* check again to avoid false glitches */
+		if (!is_fpgamgr_initdone_high())
+			continue;
+		return 1;
+	}
+
+	return 0;
+}

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

@@ -6,6 +6,7 @@
 
 #include <common.h>
 #include <asm/io.h>
+#include <altera.h>
 #include <miiphy.h>
 #include <netdev.h>
 #include <asm/arch/reset_manager.h>
@@ -93,6 +94,39 @@ int overwrite_console(void)
 }
 #endif
 
+#ifdef CONFIG_FPGA
+/*
+ * FPGA programming support for SoC FPGA Cyclone V
+ */
+static Altera_desc altera_fpga[] = {
+	{
+		/* Family */
+		Altera_SoCFPGA,
+		/* Interface type */
+		fast_passive_parallel,
+		/* No limitation as additional data will be ignored */
+		-1,
+		/* No device function table */
+		NULL,
+		/* Base interface address specified in driver */
+		NULL,
+		/* No cookie implementation */
+		0
+	},
+};
+
+/* add device descriptor to FPGA device table */
+static void socfpga_fpga_add(void)
+{
+	int i;
+	fpga_init();
+	for (i = 0; i < ARRAY_SIZE(altera_fpga); i++)
+		fpga_add(fpga_altera, &altera_fpga[i]);
+}
+#else
+static inline void socfpga_fpga_add(void) {}
+#endif
+
 int arch_cpu_init(void)
 {
 	/*
@@ -108,5 +142,7 @@ int arch_cpu_init(void)
 
 int misc_init_r(void)
 {
+	/* Add device descriptor to FPGA device table */
+	socfpga_fpga_add();
 	return 0;
 }

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

@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2012 Altera Corporation <www.altera.com>
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ */
+
+#ifndef	_FPGA_MANAGER_H_
+#define	_FPGA_MANAGER_H_
+
+#include <altera.h>
+
+struct socfpga_fpga_manager {
+	/* FPGA Manager Module */
+	u32	stat;			/* 0x00 */
+	u32	ctrl;
+	u32	dclkcnt;
+	u32	dclkstat;
+	u32	gpo;			/* 0x10 */
+	u32	gpi;
+	u32	misci;			/* 0x18 */
+	u32	_pad_0x1c_0x82c[517];
+
+	/* Configuration Monitor (MON) Registers */
+	u32	gpio_inten;		/* 0x830 */
+	u32	gpio_intmask;
+	u32	gpio_inttype_level;
+	u32	gpio_int_polarity;
+	u32	gpio_intstatus;		/* 0x840 */
+	u32	gpio_raw_intstatus;
+	u32	_pad_0x848;
+	u32	gpio_porta_eoi;
+	u32	gpio_ext_porta;		/* 0x850 */
+	u32	_pad_0x854_0x85c[3];
+	u32	gpio_1s_sync;		/* 0x860 */
+	u32	_pad_0x864_0x868[2];
+	u32	gpio_ver_id_code;
+	u32	gpio_config_reg2;	/* 0x870 */
+	u32	gpio_config_reg1;
+};
+
+#define FPGAMGRREGS_STAT_MODE_MASK		0x7
+#define FPGAMGRREGS_STAT_MSEL_MASK		0xf8
+#define FPGAMGRREGS_STAT_MSEL_LSB		3
+
+#define FPGAMGRREGS_CTRL_CFGWDTH_MASK		0x200
+#define FPGAMGRREGS_CTRL_AXICFGEN_MASK		0x100
+#define FPGAMGRREGS_CTRL_NCONFIGPULL_MASK	0x4
+#define FPGAMGRREGS_CTRL_NCE_MASK		0x2
+#define FPGAMGRREGS_CTRL_EN_MASK		0x1
+#define FPGAMGRREGS_CTRL_CDRATIO_LSB		6
+
+#define FPGAMGRREGS_MON_GPIO_EXT_PORTA_CRC_MASK	0x8
+#define FPGAMGRREGS_MON_GPIO_EXT_PORTA_ID_MASK	0x4
+#define FPGAMGRREGS_MON_GPIO_EXT_PORTA_CD_MASK	0x2
+#define FPGAMGRREGS_MON_GPIO_EXT_PORTA_NS_MASK	0x1
+
+/* FPGA Mode */
+#define FPGAMGRREGS_MODE_FPGAOFF		0x0
+#define FPGAMGRREGS_MODE_RESETPHASE		0x1
+#define FPGAMGRREGS_MODE_CFGPHASE		0x2
+#define FPGAMGRREGS_MODE_INITPHASE		0x3
+#define FPGAMGRREGS_MODE_USERMODE		0x4
+#define FPGAMGRREGS_MODE_UNKNOWN		0x5
+
+/* FPGA CD Ratio Value */
+#define CDRATIO_x1				0x0
+#define CDRATIO_x2				0x1
+#define CDRATIO_x4				0x2
+#define CDRATIO_x8				0x3
+
+/* SoCFPGA support functions */
+int fpgamgr_test_fpga_ready(void);
+int fpgamgr_poll_fpga_ready(void);
+int fpgamgr_get_mode(void);
+
+#endif /* _FPGA_MANAGER_H_ */

drivers/fpga/Makefile

@@ -17,4 +17,5 @@ obj-y += altera.o
 obj-$(CONFIG_FPGA_ACEX1K) += ACEX1K.o
 obj-$(CONFIG_FPGA_CYCLON2) += cyclon2.o
 obj-$(CONFIG_FPGA_STRATIX_II) += stratixII.o
+obj-$(CONFIG_FPGA_SOCFPGA) += socfpga.o
 endif

drivers/fpga/altera.c

@@ -37,6 +37,9 @@ static const struct altera_fpga {
 	{ Altera_StratixII, "StratixII", StratixII_load,
 	  StratixII_dump, StratixII_info },
 #endif
+#if defined(CONFIG_FPGA_SOCFPGA)
+	{ Altera_SoCFPGA, "SoC FPGA", socfpga_load, NULL, NULL },
+#endif
 };
 
 static int altera_validate(Altera_desc *desc, const char *fn)