[PATCH v7 12/15] RISC-V: Device, timer, IRQs, and the SBI

[Palmer Dabbelt]

This patch contains code that interfaces with devices that are mandated
by the RISC-V supervisor specification and that don't have explicit
drivers anywhere else in the tree.  This includes the staticly defined
interrupts, the CSR-mapped timer, and virtualized SBI devices.

Signed-off-by: Palmer Dabbelt 
---
 arch/riscv/include/asm/delay.h   |  28 +
 arch/riscv/include/asm/dma-mapping.h |  38 
 arch/riscv/include/asm/irq.h |  28 +
 arch/riscv/include/asm/irqflags.h|  63 
 arch/riscv/include/asm/pci.h |  48 +++
 arch/riscv/include/asm/sbi.h | 100 +++
 arch/riscv/include/asm/timex.h   |  59 +++
 arch/riscv/lib/delay.c   | 110 +++
 arch/riscv/mm/ioremap.c  |  92 +
 9 files changed, 566 insertions(+)
 create mode 100644 arch/riscv/include/asm/delay.h
 create mode 100644 arch/riscv/include/asm/dma-mapping.h
 create mode 100644 arch/riscv/include/asm/irq.h
 create mode 100644 arch/riscv/include/asm/irqflags.h
 create mode 100644 arch/riscv/include/asm/pci.h
 create mode 100644 arch/riscv/include/asm/sbi.h
 create mode 100644 arch/riscv/include/asm/timex.h
 create mode 100644 arch/riscv/lib/delay.c
 create mode 100644 arch/riscv/mm/ioremap.c

diff --git a/arch/riscv/include/asm/delay.h b/arch/riscv/include/asm/delay.h
new file mode 100644
index ..cbb0c9eb96cb
--- /dev/null
+++ b/arch/riscv/include/asm/delay.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2009 Chen Liqin 
+ * Copyright (C) 2016 Regents of the University of California
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ */
+
+#ifndef _ASM_RISCV_DELAY_H
+#define _ASM_RISCV_DELAY_H
+
+extern unsigned long riscv_timebase;
+
+#define udelay udelay
+extern void udelay(unsigned long usecs);
+
+#define ndelay ndelay
+extern void ndelay(unsigned long nsecs);
+
+extern void __delay(unsigned long cycles);
+
+#endif /* _ASM_RISCV_DELAY_H */
diff --git a/arch/riscv/include/asm/dma-mapping.h 
b/arch/riscv/include/asm/dma-mapping.h
new file mode 100644
index ..3eec1000196d
--- /dev/null
+++ b/arch/riscv/include/asm/dma-mapping.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2003-2004 Hewlett-Packard Co
+ * David Mosberger-Tang 
+ * Copyright (C) 2012 ARM Ltd.
+ * Copyright (C) 2016 SiFive, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see .
+ */
+#ifndef __ASM_RISCV_DMA_MAPPING_H
+#define __ASM_RISCV_DMA_MAPPING_H
+
+/* Use ops->dma_mapping_error (if it exists) or assume success */
+// #undef DMA_ERROR_CODE
+
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+{
+   return _noop_ops;
+}
+
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t 
size)
+{
+   if (!dev->dma_mask)
+   return false;
+
+   return addr + size - 1 <= *dev->dma_mask;
+}
+
+#endif /* __ASM_RISCV_DMA_MAPPING_H */
diff --git a/arch/riscv/include/asm/irq.h b/arch/riscv/include/asm/irq.h
new file mode 100644
index ..4dee9d4c13c0
--- /dev/null
+++ b/arch/riscv/include/asm/irq.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ */
+
+#ifndef _ASM_RISCV_IRQ_H
+#define _ASM_RISCV_IRQ_H
+
+#define NR_IRQS 0
+
+#define INTERRUPT_CAUSE_SOFTWARE1
+#define INTERRUPT_CAUSE_TIMER   5
+#define INTERRUPT_CAUSE_EXTERNAL9
+
+void 

[PATCH v7 12/15] RISC-V: Device, timer, IRQs, and the SBI

[Palmer Dabbelt]

This patch contains code that interfaces with devices that are mandated
by the RISC-V supervisor specification and that don't have explicit
drivers anywhere else in the tree.  This includes the staticly defined
interrupts, the CSR-mapped timer, and virtualized SBI devices.

Signed-off-by: Palmer Dabbelt 
---
 arch/riscv/include/asm/delay.h   |  28 +
 arch/riscv/include/asm/dma-mapping.h |  38 
 arch/riscv/include/asm/irq.h |  28 +
 arch/riscv/include/asm/irqflags.h|  63 
 arch/riscv/include/asm/pci.h |  48 +++
 arch/riscv/include/asm/sbi.h | 100 +++
 arch/riscv/include/asm/timex.h   |  59 +++
 arch/riscv/lib/delay.c   | 110 +++
 arch/riscv/mm/ioremap.c  |  92 +
 9 files changed, 566 insertions(+)
 create mode 100644 arch/riscv/include/asm/delay.h
 create mode 100644 arch/riscv/include/asm/dma-mapping.h
 create mode 100644 arch/riscv/include/asm/irq.h
 create mode 100644 arch/riscv/include/asm/irqflags.h
 create mode 100644 arch/riscv/include/asm/pci.h
 create mode 100644 arch/riscv/include/asm/sbi.h
 create mode 100644 arch/riscv/include/asm/timex.h
 create mode 100644 arch/riscv/lib/delay.c
 create mode 100644 arch/riscv/mm/ioremap.c

diff --git a/arch/riscv/include/asm/delay.h b/arch/riscv/include/asm/delay.h
new file mode 100644
index ..cbb0c9eb96cb
--- /dev/null
+++ b/arch/riscv/include/asm/delay.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2009 Chen Liqin 
+ * Copyright (C) 2016 Regents of the University of California
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ */
+
+#ifndef _ASM_RISCV_DELAY_H
+#define _ASM_RISCV_DELAY_H
+
+extern unsigned long riscv_timebase;
+
+#define udelay udelay
+extern void udelay(unsigned long usecs);
+
+#define ndelay ndelay
+extern void ndelay(unsigned long nsecs);
+
+extern void __delay(unsigned long cycles);
+
+#endif /* _ASM_RISCV_DELAY_H */
diff --git a/arch/riscv/include/asm/dma-mapping.h 
b/arch/riscv/include/asm/dma-mapping.h
new file mode 100644
index ..3eec1000196d
--- /dev/null
+++ b/arch/riscv/include/asm/dma-mapping.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2003-2004 Hewlett-Packard Co
+ * David Mosberger-Tang 
+ * Copyright (C) 2012 ARM Ltd.
+ * Copyright (C) 2016 SiFive, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see .
+ */
+#ifndef __ASM_RISCV_DMA_MAPPING_H
+#define __ASM_RISCV_DMA_MAPPING_H
+
+/* Use ops->dma_mapping_error (if it exists) or assume success */
+// #undef DMA_ERROR_CODE
+
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+{
+   return _noop_ops;
+}
+
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t 
size)
+{
+   if (!dev->dma_mask)
+   return false;
+
+   return addr + size - 1 <= *dev->dma_mask;
+}
+
+#endif /* __ASM_RISCV_DMA_MAPPING_H */
diff --git a/arch/riscv/include/asm/irq.h b/arch/riscv/include/asm/irq.h
new file mode 100644
index ..4dee9d4c13c0
--- /dev/null
+++ b/arch/riscv/include/asm/irq.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ */
+
+#ifndef _ASM_RISCV_IRQ_H
+#define _ASM_RISCV_IRQ_H
+
+#define NR_IRQS 0
+
+#define INTERRUPT_CAUSE_SOFTWARE1
+#define INTERRUPT_CAUSE_TIMER   5
+#define INTERRUPT_CAUSE_EXTERNAL9
+
+void riscv_timer_interrupt(void);
+
+#include 
+
+#endif /* _ASM_RISCV_IRQ_H */
diff