]>
git.ipfire.org Git - people/ms/u-boot.git/blob - arch/arm/cpu/arm926ejs/kirkwood/mpp.c
2 * arch/arm/mach-kirkwood/mpp.c
4 * MPP functions for Marvell Kirkwood SoCs
5 * Referenced from Linux kernel source
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
14 #include <asm/arch/cpu.h>
15 #include <asm/arch/soc.h>
16 #include <asm/arch/mpp.h>
18 static u32
kirkwood_variant(void)
20 switch (readl(KW_REG_DEVICE_ID
) & 0x03) {
22 return MPP_F6192_MASK
;
24 return MPP_F6281_MASK
;
26 debug("MPP setup: unknown kirkwood variant\n");
31 #define MPP_CTRL(i) (KW_MPP_BASE + (i* 4))
32 #define MPP_NR_REGS (1 + MPP_MAX/8)
34 void kirkwood_mpp_conf(const u32
*mpp_list
, u32
*mpp_save
)
36 u32 mpp_ctrl
[MPP_NR_REGS
];
37 unsigned int variant_mask
;
40 variant_mask
= kirkwood_variant();
44 debug( "initial MPP regs:");
45 for (i
= 0; i
< MPP_NR_REGS
; i
++) {
46 mpp_ctrl
[i
] = readl(MPP_CTRL(i
));
47 debug(" %08x", mpp_ctrl
[i
]);
53 unsigned int num
= MPP_NUM(*mpp_list
);
54 unsigned int sel
= MPP_SEL(*mpp_list
);
55 unsigned int sel_save
;
59 debug("kirkwood_mpp_conf: invalid MPP "
60 "number (%u)\n", num
);
63 if (!(*mpp_list
& variant_mask
)) {
64 debug("kirkwood_mpp_conf: requested MPP%u config "
65 "unavailable on this hardware\n", num
);
69 shift
= (num
& 7) << 2;
72 sel_save
= (mpp_ctrl
[num
/ 8] >> shift
) & 0xf;
73 *mpp_save
= num
| (sel_save
<< 8) | variant_mask
;
77 mpp_ctrl
[num
/ 8] &= ~(0xf << shift
);
78 mpp_ctrl
[num
/ 8] |= sel
<< shift
;
83 debug(" final MPP regs:");
84 for (i
= 0; i
< MPP_NR_REGS
; i
++) {
85 writel(mpp_ctrl
[i
], MPP_CTRL(i
));
86 debug(" %08x", mpp_ctrl
[i
]);