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[ARM] 4712/2: Adds functions to read and write IXP4xx "feature" bits 

Adds functions to read and write IXP4xx "feature" (aka "fuse")
bits, containing information about available/enabled CPU features.

The uncompress.h included by boot/compressed/misc.c resides in
a different space than rest of the kernel and thus can't use
asm/hardware.h (including asm/arch/cpu.h - which, in turn, may use
EXPORTed symbol "processor_id").

Posted to linux-arm-kernel on 2 Dec 2007 and revised.

Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Krzysztof Halasa 2007-12-18 03:53:27 +01:00 committed by Russell King
parent a9a424ce9a
commit c18f65816e
5 changed files with 52 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/kernel/setup.c
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@ -62,6 +62,7 @@ extern int root_mountflags;
extern void _stext, _text, _etext, __data_start, _edata, _end;
unsigned int processor_id;
EXPORT_SYMBOL(processor_id);
unsigned int __machine_arch_type;
EXPORT_SYMBOL(__machine_arch_type);

15
include/asm-arm/arch-ixp4xx/cpu.h
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@ -28,4 +28,19 @@ extern unsigned int processor_id;
#define cpu_is_ixp46x() ((processor_id & IXP4XX_PROCESSOR_ID_MASK) == \
IXP465_PROCESSOR_ID_VALUE)
static inline u32 ixp4xx_read_feature_bits(void)
{
unsigned int val = ~*IXP4XX_EXP_CFG2;
val &= ~IXP4XX_FEATURE_RESERVED;
if (!cpu_is_ixp46x())
val &= ~IXP4XX_FEATURE_IXP46X_ONLY;
return val;
}
static inline void ixp4xx_write_feature_bits(u32 value)
{
*IXP4XX_EXP_CFG2 = ~value;
}
#endif /* _ASM_ARCH_CPU_H */

6
include/asm-arm/arch-ixp4xx/hardware.h
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@ -27,13 +27,13 @@
#define pcibios_assign_all_busses() 1
/* Register locations and bits */
#include "ixp4xx-regs.h"
#ifndef __ASSEMBLER__
#include <asm/arch/cpu.h>
#endif
/* Register locations and bits */
#include "ixp4xx-regs.h"
/* Platform helper functions and definitions */
#include "platform.h"

36
include/asm-arm/arch-ixp4xx/ixp4xx-regs.h
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@ -15,10 +15,6 @@
*
*/
#ifndef __ASM_ARCH_HARDWARE_H__
#error "Do not include this directly, instead #include <asm/hardware.h>"
#endif
#ifndef _ASM_ARM_IXP4XX_H_
#define _ASM_ARM_IXP4XX_H_
@ -607,4 +603,36 @@
#define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */
/* "fuse" bits of IXP_EXP_CFG2 */
#define IXP4XX_FEATURE_RCOMP (1 << 0)
#define IXP4XX_FEATURE_USB_DEVICE (1 << 1)
#define IXP4XX_FEATURE_HASH (1 << 2)
#define IXP4XX_FEATURE_AES (1 << 3)
#define IXP4XX_FEATURE_DES (1 << 4)
#define IXP4XX_FEATURE_HDLC (1 << 5)
#define IXP4XX_FEATURE_AAL (1 << 6)
#define IXP4XX_FEATURE_HSS (1 << 7)
#define IXP4XX_FEATURE_UTOPIA (1 << 8)
#define IXP4XX_FEATURE_NPEB_ETH0 (1 << 9)
#define IXP4XX_FEATURE_NPEC_ETH (1 << 10)
#define IXP4XX_FEATURE_RESET_NPEA (1 << 11)
#define IXP4XX_FEATURE_RESET_NPEB (1 << 12)
#define IXP4XX_FEATURE_RESET_NPEC (1 << 13)
#define IXP4XX_FEATURE_PCI (1 << 14)
#define IXP4XX_FEATURE_ECC_TIMESYNC (1 << 15)
#define IXP4XX_FEATURE_UTOPIA_PHY_LIMIT (3 << 16)
#define IXP4XX_FEATURE_USB_HOST (1 << 18)
#define IXP4XX_FEATURE_NPEA_ETH (1 << 19)
#define IXP4XX_FEATURE_NPEB_ETH_1_TO_3 (1 << 20)
#define IXP4XX_FEATURE_RSA (1 << 21)
#define IXP4XX_FEATURE_XSCALE_MAX_FREQ (3 << 22)
#define IXP4XX_FEATURE_RESERVED (0xFF << 24)
#define IXP4XX_FEATURE_IXP46X_ONLY (IXP4XX_FEATURE_ECC_TIMESYNC | \
IXP4XX_FEATURE_USB_HOST | \
IXP4XX_FEATURE_NPEA_ETH | \
IXP4XX_FEATURE_NPEB_ETH_1_TO_3 | \
IXP4XX_FEATURE_RSA | \
IXP4XX_FEATURE_XSCALE_MAX_FREQ)
#endif

2
include/asm-arm/arch-ixp4xx/uncompress.h
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@ -13,7 +13,7 @@
#ifndef _ARCH_UNCOMPRESS_H_
#define _ARCH_UNCOMPRESS_H_
#include <asm/hardware.h>
#include "ixp4xx-regs.h"
#include <asm/mach-types.h>
#include <linux/serial_reg.h>