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[POWERPC] Support for DCR based MPIC

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This patch implements support for DCR based MPIC implementations. Such
implementations have the MPIC_USES_DCR flag set and don't use the phys_addr
argument of mpic_alloc (they require a valid dcr mapping in the device node)

This version of the patch can use a little bif of cleanup still (I can
probably consolidate rb->dbase/doff, at least once I'm sure on how the
hardware is actually supposed to work vs. possible simulator issues) and
it should be possible to build a DCR-only version of the driver. I need
to cleanup a bit the CONFIG_* handling for that and probably introduce
CONFIG_MPIC_MMIO and CONFIG_MPIC_DCR.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
2006-11-11 17:24:55 +11:00
committed by Paul Mackerras
parent 1be3770aa9
commit fbf0274e43
2 changed files with 131 additions and 40 deletions
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35
include/asm-powerpc/mpic.h
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@@ -3,6 +3,7 @@
#ifdef __KERNEL__
#include <linux/irq.h>
#include <asm/dcr.h>
/*
* Global registers
@@ -225,6 +226,23 @@ struct mpic_irq_fixup
#endif /* CONFIG_MPIC_BROKEN_U3 */
enum mpic_reg_type {
mpic_access_mmio_le,
mpic_access_mmio_be,
#ifdef CONFIG_PPC_DCR
mpic_access_dcr
#endif
};
struct mpic_reg_bank {
u32 __iomem *base;
#ifdef CONFIG_PPC_DCR
dcr_host_t dhost;
unsigned int dbase;
unsigned int doff;
#endif /* CONFIG_PPC_DCR */
};
/* The instance data of a given MPIC */
struct mpic
{
@@ -264,11 +282,18 @@ struct mpic
spinlock_t fixup_lock;
#endif
/* Register access method */
enum mpic_reg_type reg_type;
/* The various ioremap'ed bases */
volatile u32 __iomem *gregs;
volatile u32 __iomem *tmregs;
volatile u32 __iomem *cpuregs[MPIC_MAX_CPUS];
volatile u32 __iomem *isus[MPIC_MAX_ISU];
struct mpic_reg_bank gregs;
struct mpic_reg_bank tmregs;
struct mpic_reg_bank cpuregs[MPIC_MAX_CPUS];
struct mpic_reg_bank isus[MPIC_MAX_ISU];
#ifdef CONFIG_PPC_DCR
unsigned int dcr_base;
#endif
#ifdef CONFIG_MPIC_WEIRD
/* Pointer to HW info array */
@@ -305,6 +330,8 @@ struct mpic
#define MPIC_SPV_EOI 0x00000020
/* No passthrough disable */
#define MPIC_NO_PTHROU_DIS 0x00000040
/* DCR based MPIC */
#define MPIC_USES_DCR 0x00000080
/* MPIC HW modification ID */
#define MPIC_REGSET_MASK 0xf0000000