1 /* 2 * arch/arm/mach-kirkwood/mpp.c 3 * 4 * MPP functions for Marvell Kirkwood SoCs 5 * Referenced from Linux kernel source 6 * 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. 10 */ 11 12 #include <common.h> 13 #include <asm/io.h> 14 #include <asm/arch/cpu.h> 15 #include <asm/arch/soc.h> 16 #include <asm/arch/mpp.h> 17 18 static u32 kirkwood_variant(void) 19 { 20 switch (readl(KW_REG_DEVICE_ID) & 0x03) { 21 case 1: 22 return MPP_F6192_MASK; 23 case 2: 24 return MPP_F6281_MASK; 25 default: 26 debug("MPP setup: unknown kirkwood variant\n"); 27 return 0; 28 } 29 } 30 31 #define MPP_CTRL(i) (KW_MPP_BASE + (i* 4)) 32 #define MPP_NR_REGS (1 + MPP_MAX/8) 33 34 void kirkwood_mpp_conf(const u32 *mpp_list, u32 *mpp_save) 35 { 36 u32 mpp_ctrl[MPP_NR_REGS]; 37 unsigned int variant_mask; 38 int i; 39 40 variant_mask = kirkwood_variant(); 41 if (!variant_mask) 42 return; 43 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]); 48 } 49 debug("\n"); 50 51 52 while (*mpp_list) { 53 unsigned int num = MPP_NUM(*mpp_list); 54 unsigned int sel = MPP_SEL(*mpp_list); 55 unsigned int sel_save; 56 int shift; 57 58 if (num > MPP_MAX) { 59 debug("kirkwood_mpp_conf: invalid MPP " 60 "number (%u)\n", num); 61 continue; 62 } 63 if (!(*mpp_list & variant_mask)) { 64 debug("kirkwood_mpp_conf: requested MPP%u config " 65 "unavailable on this hardware\n", num); 66 continue; 67 } 68 69 shift = (num & 7) << 2; 70 71 if (mpp_save) { 72 sel_save = (mpp_ctrl[num / 8] >> shift) & 0xf; 73 *mpp_save = num | (sel_save << 8) | variant_mask; 74 mpp_save++; 75 } 76 77 mpp_ctrl[num / 8] &= ~(0xf << shift); 78 mpp_ctrl[num / 8] |= sel << shift; 79 80 mpp_list++; 81 } 82 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]); 87 } 88 debug("\n"); 89 90 } 91
