[PATCH 11/15] asm-generic: add legacy I/O header files

Arnd Bergmann
2009-05-13T22:56:52Z

The dma.h, hw_irq.h, serial.h and timex.h files originally
described PC-style i8237, i8259A, i8250, i8253 and i8255 chips
as well as the VGA style text mode graphics.

Modern architectures live happily without these specific
interfaces, but a few definitions from these headers keep
getting used in common code.

The new generic headers are what most architectures use
anyway nowadays, just implementing the minimal definitions.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Remis Lima Baima <remis.developer@googlemail.com>
---
include/asm-generic/dma.h | 15 +++++++++++++++
include/asm-generic/hw_irq.h | 9 +++++++++
include/asm-generic/parport.h | 23 +++++++++++++++++++++++
include/asm-generic/serial.h | 13 +++++++++++++
include/asm-generic/timex.h | 22 ++++++++++++++++++++++
include/asm-generic/vga.h | 24 ++++++++++++++++++++++++
6 files changed, 106 insertions(+), 0 deletions(-)
create mode 100644 include/asm-generic/dma.h
create mode 100644 include/asm-generic/hw_irq.h
create mode 100644 include/asm-generic/parport.h
create mode 100644 include/asm-generic/serial.h
create mode 100644 include/asm-generic/timex.h
create mode 100644 include/asm-generic/vga.h

diff --git a/include/asm-generic/dma.h b/include/asm-generic/dma.h
new file mode 100644
index 0000000..9dfc3a7
--- /dev/null
+++ b/include/asm-generic/dma.h
@@ -0,0 +1,15 @@
+#ifndef __ASM_GENERIC_DMA_H
+#define __ASM_GENERIC_DMA_H
+/*
+ * This file traditionally describes the i8237 PC style DMA controller.
+ * Most architectures don't have these any more and can get the minimal
+ * implementation from kernel/dma.c by not defining MAX_DMA_CHANNELS.
+ *
+ * Some code relies on seeing MAX_DMA_ADDRESS though.
+ */
+#define MAX_DMA_ADDRESS PAGE_OFFSET
+
+extern int request_dma(unsigned int dmanr, const char *device_id);
+extern void free_dma(unsigned int dmanr);
+
+#endif /* __ASM_GENERIC_DMA_H */
diff --git a/include/asm-generic/hw_irq.h b/include/asm-generic/hw_irq.h
new file mode 100644
index 0000000..89036d7
--- /dev/null
+++ b/include/asm-generic/hw_irq.h
@@ -0,0 +1,9 @@
+#ifndef __ASM_GENERIC_HW_IRQ_H
+#define __ASM_GENERIC_HW_IRQ_H
+/*
+ * hw_irq.h has internal declarations for the low-level interrupt
+ * controller, like the original i8259A.
+ * In general, this is not needed for new architectures.
+ */
+
+#endif /* __ASM_GENERIC_HW_IRQ_H */
diff --git a/include/asm-generic/parport.h b/include/asm-generic/parport.h
new file mode 100644
index 0000000..40528cb
--- /dev/null
+++ b/include/asm-generic/parport.h
@@ -0,0 +1,23 @@
+#ifndef __ASM_GENERIC_PARPORT_H
+#define __ASM_GENERIC_PARPORT_H
+
+/*
+ * An ISA bus may have i8255 parallel ports at well-known
+ * locations in the I/O space, which are scanned by
+ * parport_pc_find_isa_ports.
+ *
+ * Without ISA support, the driver will only attach
+ * to devices on the PCI bus.
+ */
+
+static int __devinit parport_pc_find_isa_ports(int autoirq, int autodma);
+static int __devinit parport_pc_find_nonpci_ports(int autoirq, int autodma)
+{
+#ifdef CONFIG_ISA
+ return parport_pc_find_isa_ports(autoirq, autodma);
+#else
+ return 0;
+#endif
+}
+
+#endif /* __ASM_GENERIC_PARPORT_H */
diff --git a/include/asm-generic/serial.h b/include/asm-generic/serial.h
new file mode 100644
index 0000000..5e29109
--- /dev/null
+++ b/include/asm-generic/serial.h
@@ -0,0 +1,13 @@
+#ifndef __ASM_GENERIC_SERIAL_H
+#define __ASM_GENERIC_SERIAL_H
+
+/*
+ * This should not be an architecture specific #define, oh well.
+ *
+ * Traditionally, it just describes i8250 and related serial ports
+ * that have this clock rate.
+ */
+
+#define BASE_BAUD (1843200 / 16)
+
+#endif /* __ASM_GENERIC_SERIAL_H */
diff --git a/include/asm-generic/timex.h b/include/asm-generic/timex.h
new file mode 100644
index 0000000..b2243cb
--- /dev/null
+++ b/include/asm-generic/timex.h
@@ -0,0 +1,22 @@
+#ifndef __ASM_GENERIC_TIMEX_H
+#define __ASM_GENERIC_TIMEX_H
+
+/*
+ * If you have a cycle counter, return the value here.
+ */
+typedef unsigned long cycles_t;
+#ifndef get_cycles
+static inline cycles_t get_cycles(void)
+{
+ return 0;
+}
+#endif
+
+/*
+ * Architectures are encouraged to implement read_current_timer
+ * and define this in order to avoid the expensive delay loop
+ * calibration during boot.
+ */
+#undef ARCH_HAS_READ_CURRENT_TIMER
+
+#endif /* __ASM_GENERIC_TIMEX_H */
diff --git a/include/asm-generic/vga.h b/include/asm-generic/vga.h
new file mode 100644
index 0000000..36c8ff5
--- /dev/null
+++ b/include/asm-generic/vga.h
@@ -0,0 +1,24 @@
+/*
+ * Access to VGA videoram
+ *
+ * (c) 1998 Martin Mares <mj@ucw.cz>
+ */
+#ifndef __ASM_GENERIC_VGA_H
+#define __ASM_GENERIC_VGA_H
+
+/*
+ * On most architectures that support VGA, we can just
+ * recalculate addresses and then access the videoram
+ * directly without any black magic.
+ *
+ * Everyone else needs to ioremap the address and use
+ * proper I/O accesses.
+ */
+#ifndef VGA_MAP_MEM
+#define VGA_MAP_MEM(x, s) (unsigned long)phys_to_virt(x)
+#endif
+
+#define vga_readb(x) (*(x))
+#define vga_writeb(x, y) (*(y) = (x))
+
+#endif /* _ASM_GENERIC_VGA_H */
--
1.6.0.4