Add microwatt_soc.h and io.h include file

This contains C definitions for various Microwatt internal MMIOs
and a set of accessors.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

include/io.h

@@ -0,0 +1,53 @@
+#ifndef __IO_H
+#define __IO_H
+
+static inline uint8_t readb(unsigned long addr)
+{
+	uint8_t val;
+	__asm__ volatile("sync; lbzcix %0,0,%1" : "=r" (val) : "r" (addr) : "memory");
+	return val;
+}
+
+static inline uint16_t readw(unsigned long addr)
+{
+	uint16_t val;
+	__asm__ volatile("sync; lhzcix %0,0,%1" : "=r" (val) : "r" (addr) : "memory");
+	return val;
+}
+
+static inline uint32_t readl(unsigned long addr)
+{
+	uint32_t val;
+	__asm__ volatile("sync; lwzcix %0,0,%1" : "=r" (val) : "r" (addr) : "memory");
+	return val;
+}
+
+static inline uint64_t readq(unsigned long addr)
+{
+	uint64_t val;
+	__asm__ volatile("sync; ldcix %0,0,%1" : "=r" (val) : "r" (addr) : "memory");
+	return val;
+}
+
+static inline void writeb(uint8_t val, unsigned long addr)
+{
+	__asm__ volatile("sync; stbcix %0,0,%1" : : "r" (val), "r" (addr) : "memory");
+}
+
+static inline void writew(uint16_t val, unsigned long addr)
+{
+	__asm__ volatile("sync; sthcix %0,0,%1" : : "r" (val), "r" (addr) : "memory");
+}
+
+static inline void writel(uint32_t val, unsigned long addr)
+{
+	__asm__ volatile("sync; stwcix %0,0,%1" : : "r" (val), "r" (addr) : "memory");
+}
+
+static inline void writeq(uint64_t val, unsigned long addr)
+{
+	__asm__ volatile("sync; stdcix %0,0,%1" : : "r" (val), "r" (addr) : "memory");
+}
+
+#endif /* __IO_H */
+

include/microwatt_soc.h

@@ -0,0 +1,34 @@
+#ifndef __MICROWATT_SOC_H
+#define __MICROWATT_SOC_H
+
+/*
+ * Definitions for the syscon registers
+ */
+#define SYSCON_BASE	0xc0000000
+
+#define SYS_REG_SIGNATURE		0x00
+#define SYS_REG_INFO			0x08
+#define   SYS_REG_INFO_HAS_UART 		(1ull << 0)
+#define   SYS_REG_INFO_HAS_DRAM 		(1ull << 1)
+#define SYS_REG_BRAMINFO		0x10
+#define SYS_REG_DRAMINFO		0x18
+#define SYS_REG_CLKINFO			0x20
+#define SYS_REG_CTRL			0x28
+#define   SYS_REG_CTRL_DRAM_AT_0		(1ull << 0)
+#define   SYS_REG_CTRL_CORE_RESET		(1ull << 1)
+#define   SYS_REG_CTRL_SOC_RESET		(1ull << 2)
+
+/* Definition for the "Potato" UART */
+#define UART_BASE	0xc0002000
+
+#define POTATO_CONSOLE_TX		0x00
+#define POTATO_CONSOLE_RX		0x08
+#define POTATO_CONSOLE_STATUS		0x10
+#define   POTATO_CONSOLE_STATUS_RX_EMPTY		0x01
+#define   POTATO_CONSOLE_STATUS_TX_EMPTY		0x02
+#define   POTATO_CONSOLE_STATUS_RX_FULL			0x04
+#define   POTATO_CONSOLE_STATUS_TX_FULL			0x08
+#define POTATO_CONSOLE_CLOCK_DIV	0x18
+#define POTATO_CONSOLE_IRQ_EN		0x20
+
+#endif /* __MICROWATT_SOC_H */