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https://github.com/AsahiLinux/u-boot
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91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
/*
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* arch/arm/mach-kirkwood/mpp.c
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*
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* MPP functions for Marvell Kirkwood SoCs
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* Referenced from Linux kernel source
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <common.h>
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#include <log.h>
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#include <asm/io.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/soc.h>
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#include <asm/arch/mpp.h>
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static u32 kirkwood_variant(void)
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{
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switch (readl(KW_REG_DEVICE_ID) & 0x03) {
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case 1:
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return MPP_F6192_MASK;
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case 2:
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return MPP_F6281_MASK;
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default:
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debug("MPP setup: unknown kirkwood variant\n");
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return 0;
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}
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}
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#define MPP_CTRL(i) (KW_MPP_BASE + (i* 4))
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#define MPP_NR_REGS (1 + MPP_MAX/8)
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void kirkwood_mpp_conf(const u32 *mpp_list, u32 *mpp_save)
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{
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u32 mpp_ctrl[MPP_NR_REGS];
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unsigned int variant_mask;
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int i;
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variant_mask = kirkwood_variant();
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if (!variant_mask)
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return;
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debug( "initial MPP regs:");
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for (i = 0; i < MPP_NR_REGS; i++) {
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mpp_ctrl[i] = readl(MPP_CTRL(i));
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debug(" %08x", mpp_ctrl[i]);
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}
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debug("\n");
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while (*mpp_list) {
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unsigned int num = MPP_NUM(*mpp_list);
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unsigned int sel = MPP_SEL(*mpp_list);
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unsigned int sel_save;
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int shift;
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if (num > MPP_MAX) {
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debug("kirkwood_mpp_conf: invalid MPP "
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"number (%u)\n", num);
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continue;
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}
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if (!(*mpp_list & variant_mask)) {
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debug("kirkwood_mpp_conf: requested MPP%u config "
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"unavailable on this hardware\n", num);
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continue;
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}
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shift = (num & 7) << 2;
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if (mpp_save) {
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sel_save = (mpp_ctrl[num / 8] >> shift) & 0xf;
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*mpp_save = num | (sel_save << 8) | variant_mask;
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mpp_save++;
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}
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mpp_ctrl[num / 8] &= ~(0xf << shift);
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mpp_ctrl[num / 8] |= sel << shift;
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mpp_list++;
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}
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debug(" final MPP regs:");
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for (i = 0; i < MPP_NR_REGS; i++) {
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writel(mpp_ctrl[i], MPP_CTRL(i));
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debug(" %08x", mpp_ctrl[i]);
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}
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debug("\n");
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}
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