4 files changed, 178 insertions, 2 deletions

diff --git a/arch/sh/boards/mach-sdk7786/Makefile b/arch/sh/boards/mach-sdk7786/Makefile
index a29f19e85b63..23ff7d4ac491 100644
--- a/arch/sh/boards/mach-sdk7786/Makefile
+++ b/arch/sh/boards/mach-sdk7786/Makefile
@@ -1 +1,4 @@
-obj-y	:= setup.o fpga.o irq.o
+obj-y	:= fpga.o irq.o setup.o
+
+obj-$(CONFIG_GENERIC_GPIO)	+= gpio.o
+obj-$(CONFIG_HAVE_SRAM_POOL)	+= sram.o
diff --git a/arch/sh/boards/mach-sdk7786/gpio.c b/arch/sh/boards/mach-sdk7786/gpio.c
new file mode 100644
index 000000000000..f71ce09d4e15
--- /dev/null
+++ b/arch/sh/boards/mach-sdk7786/gpio.c
@@ -0,0 +1,49 @@
+/*
+ * SDK7786 FPGA USRGPIR Support.
+ *
+ * Copyright (C) 2010  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <mach/fpga.h>
+
+#define NR_FPGA_GPIOS	8
+
+static const char *usrgpir_gpio_names[NR_FPGA_GPIOS] = {
+	"in0", "in1", "in2", "in3", "in4", "in5", "in6", "in7",
+};
+
+static int usrgpir_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+	/* always in */
+	return 0;
+}
+
+static int usrgpir_gpio_get(struct gpio_chip *chip, unsigned gpio)
+{
+	return !!(fpga_read_reg(USRGPIR) & (1 << gpio));
+}
+
+static struct gpio_chip usrgpir_gpio_chip = {
+	.label			= "sdk7786-fpga",
+	.names			= usrgpir_gpio_names,
+	.direction_input	= usrgpir_gpio_direction_input,
+	.get			= usrgpir_gpio_get,
+	.base			= -1, /* don't care */
+	.ngpio			= NR_FPGA_GPIOS,
+};
+
+static int __init usrgpir_gpio_setup(void)
+{
+	return gpiochip_add(&usrgpir_gpio_chip);
+}
+device_initcall(usrgpir_gpio_setup);
diff --git a/arch/sh/boards/mach-sdk7786/setup.c b/arch/sh/boards/mach-sdk7786/setup.c
index 2ec1ea5cf8ef..7e0c4e3878e0 100644
--- a/arch/sh/boards/mach-sdk7786/setup.c
+++ b/arch/sh/boards/mach-sdk7786/setup.c
@@ -20,6 +20,8 @@
 #include <asm/machvec.h>
 #include <asm/heartbeat.h>
 #include <asm/sizes.h>
+#include <asm/clock.h>
+#include <asm/clkdev.h>
 #include <asm/reboot.h>
 #include <asm/smp-ops.h>
 
@@ -140,6 +142,45 @@ static int sdk7786_mode_pins(void)
 	return fpga_read_reg(MODSWR);
 }
 
+/*
+ * FPGA-driven PCIe clocks
+ *
+ * Historically these include the oscillator, clock B (slots 2/3/4) and
+ * clock A (slot 1 and the CPU clock). Newer revs of the PCB shove
+ * everything under a single PCIe clocks enable bit that happens to map
+ * to the same bit position as the oscillator bit for earlier FPGA
+ * versions.
+ *
+ * Given that the legacy clocks have the side-effect of shutting the CPU
+ * off through the FPGA along with the PCI slots, we simply leave them in
+ * their initial state and don't bother registering them with the clock
+ * framework.
+ */
+static int sdk7786_pcie_clk_enable(struct clk *clk)
+{
+	fpga_write_reg(fpga_read_reg(PCIECR) | PCIECR_CLKEN, PCIECR);
+	return 0;
+}
+
+static void sdk7786_pcie_clk_disable(struct clk *clk)
+{
+	fpga_write_reg(fpga_read_reg(PCIECR) & ~PCIECR_CLKEN, PCIECR);
+}
+
+static struct clk_ops sdk7786_pcie_clk_ops = {
+	.enable		= sdk7786_pcie_clk_enable,
+	.disable	= sdk7786_pcie_clk_disable,
+};
+
+static struct clk sdk7786_pcie_clk = {
+	.ops		= &sdk7786_pcie_clk_ops,
+};
+
+static struct clk_lookup sdk7786_pcie_cl = {
+	.con_id		= "pcie_plat_clk",
+	.clk		= &sdk7786_pcie_clk,
+};
+
 static int sdk7786_clk_init(void)
 {
 	struct clk *clk;
@@ -158,7 +199,18 @@ static int sdk7786_clk_init(void)
 	ret = clk_set_rate(clk, 33333333);
 	clk_put(clk);
 
-	return ret;
+	/*
+	 * Setup the FPGA clocks.
+	 */
+	ret = clk_register(&sdk7786_pcie_clk);
+	if (unlikely(ret)) {
+		pr_err("FPGA clock registration failed\n");
+		return ret;
+	}
+
+	clkdev_add(&sdk7786_pcie_cl);
+
+	return 0;
 }
 
 static void sdk7786_restart(char *cmd)
diff --git a/arch/sh/boards/mach-sdk7786/sram.c b/arch/sh/boards/mach-sdk7786/sram.c
new file mode 100644
index 000000000000..c81c3abbe01c
--- /dev/null
+++ b/arch/sh/boards/mach-sdk7786/sram.c
@@ -0,0 +1,72 @@
+/*
+ * SDK7786 FPGA SRAM Support.
+ *
+ * Copyright (C) 2010  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/io.h>
+#include <linux/string.h>
+#include <mach/fpga.h>
+#include <asm/sram.h>
+#include <asm/sizes.h>
+
+static int __init fpga_sram_init(void)
+{
+	unsigned long phys;
+	unsigned int area;
+	void __iomem *vaddr;
+	int ret;
+	u16 data;
+
+	/* Enable FPGA SRAM */
+	data = fpga_read_reg(LCLASR);
+	data |= LCLASR_FRAMEN;
+	fpga_write_reg(data, LCLASR);
+
+	/*
+	 * FPGA_SEL determines the area mapping
+	 */
+	area = (data & LCLASR_FPGA_SEL_MASK) >> LCLASR_FPGA_SEL_SHIFT;
+	if (unlikely(area == LCLASR_AREA_MASK)) {
+		pr_err("FPGA memory unmapped.\n");
+		return -ENXIO;
+	}
+
+	/*
+	 * The memory itself occupies a 2KiB range at the top of the area
+	 * immediately below the system registers.
+	 */
+	phys = (area << 26) + SZ_64M - SZ_4K;
+
+	/*
+	 * The FPGA SRAM resides in translatable physical space, so set
+	 * up a mapping prior to inserting it in to the pool.
+	 */
+	vaddr = ioremap(phys, SZ_2K);
+	if (unlikely(!vaddr)) {
+		pr_err("Failed remapping FPGA memory.\n");
+		return -ENXIO;
+	}
+
+	pr_info("Adding %dKiB of FPGA memory at 0x%08lx-0x%08lx "
+		"(area %d) to pool.\n",
+		SZ_2K >> 10, phys, phys + SZ_2K - 1, area);
+
+	ret = gen_pool_add(sram_pool, (unsigned long)vaddr, SZ_2K, -1);
+	if (unlikely(ret < 0)) {
+		pr_err("Failed adding memory\n");
+		iounmap(vaddr);
+		return ret;
+	}
+
+	return 0;
+}
+postcore_initcall(fpga_sram_init);