arch/powerpc/sysdev/qe_lib/ucc.c

   1 /*
   2  * arch/powerpc/sysdev/qe_lib/ucc.c
   3  *
   4  * QE UCC API Set - UCC specific routines implementations.
   5  *
   6  * Copyright (C) 2006 Freescale Semiconductor, Inc. All rights reserved.
   7  *
   8  * Authors:     Shlomi Gridish <gridish@freescale.com>
   9  *              Li Yang <leoli@freescale.com>
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  */
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/errno.h>
  19 #include <linux/stddef.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/export.h>
  22
  23 #include <asm/irq.h>
  24 #include <asm/io.h>
  25 #include <asm/immap_qe.h>
  26 #include <asm/qe.h>
  27 #include <asm/ucc.h>
  28
  29 int ucc_set_qe_mux_mii_mng(unsigned int ucc_num)
  30 {
  31         unsigned long flags;
  32
  33         if (ucc_num > UCC_MAX_NUM - 1)
  34                 return -EINVAL;
  35
  36         spin_lock_irqsave(&cmxgcr_lock, flags);
  37         clrsetbits_be32(&qe_immr->qmx.cmxgcr, QE_CMXGCR_MII_ENET_MNG,
  38                 ucc_num << QE_CMXGCR_MII_ENET_MNG_SHIFT);
  39         spin_unlock_irqrestore(&cmxgcr_lock, flags);
  40
  41         return 0;
  42 }
  43 EXPORT_SYMBOL(ucc_set_qe_mux_mii_mng);
  44
  45 /* Configure the UCC to either Slow or Fast.
  46  *
  47  * A given UCC can be figured to support either "slow" devices (e.g. UART)
  48  * or "fast" devices (e.g. Ethernet).
  49  *
  50  * 'ucc_num' is the UCC number, from 0 - 7.
  51  *
  52  * This function also sets the UCC_GUEMR_SET_RESERVED3 bit because that bit
  53  * must always be set to 1.
  54  */
  55 int ucc_set_type(unsigned int ucc_num, enum ucc_speed_type speed)
  56 {
  57         u8 __iomem *guemr;
  58
  59         /* The GUEMR register is at the same location for both slow and fast
  60            devices, so we just use uccX.slow.guemr. */
  61         switch (ucc_num) {
  62         case 0: guemr = &qe_immr->ucc1.slow.guemr;
  63                 break;
  64         case 1: guemr = &qe_immr->ucc2.slow.guemr;
  65                 break;
  66         case 2: guemr = &qe_immr->ucc3.slow.guemr;
  67                 break;
  68         case 3: guemr = &qe_immr->ucc4.slow.guemr;
  69                 break;
  70         case 4: guemr = &qe_immr->ucc5.slow.guemr;
  71                 break;
  72         case 5: guemr = &qe_immr->ucc6.slow.guemr;
  73                 break;
  74         case 6: guemr = &qe_immr->ucc7.slow.guemr;
  75                 break;
  76         case 7: guemr = &qe_immr->ucc8.slow.guemr;
  77                 break;
  78         default:
  79                 return -EINVAL;
  80         }
  81
  82         clrsetbits_8(guemr, UCC_GUEMR_MODE_MASK,
  83                 UCC_GUEMR_SET_RESERVED3 | speed);
  84
  85         return 0;
  86 }
  87
  88 static void get_cmxucr_reg(unsigned int ucc_num, __be32 __iomem **cmxucr,
  89         unsigned int *reg_num, unsigned int *shift)
  90 {
  91         unsigned int cmx = ((ucc_num & 1) << 1) + (ucc_num > 3);
  92
  93         *reg_num = cmx + 1;
  94         *cmxucr = &qe_immr->qmx.cmxucr[cmx];
  95         *shift = 16 - 8 * (ucc_num & 2);
  96 }
  97
  98 int ucc_mux_set_grant_tsa_bkpt(unsigned int ucc_num, int set, u32 mask)
  99 {
 100         __be32 __iomem *cmxucr;
 101         unsigned int reg_num;
 102         unsigned int shift;
 103
 104         /* check if the UCC number is in range. */
 105         if (ucc_num > UCC_MAX_NUM - 1)
 106                 return -EINVAL;
 107
 108         get_cmxucr_reg(ucc_num, &cmxucr, &reg_num, &shift);
 109
 110         if (set)
 111                 setbits32(cmxucr, mask << shift);
 112         else
 113                 clrbits32(cmxucr, mask << shift);
 114
 115         return 0;
 116 }
 117
 118 int ucc_set_qe_mux_rxtx(unsigned int ucc_num, enum qe_clock clock,
 119         enum comm_dir mode)
 120 {
 121         __be32 __iomem *cmxucr;
 122         unsigned int reg_num;
 123         unsigned int shift;
 124         u32 clock_bits = 0;
 125
 126         /* check if the UCC number is in range. */
 127         if (ucc_num > UCC_MAX_NUM - 1)
 128                 return -EINVAL;
 129
 130         /* The communications direction must be RX or TX */
 131         if (!((mode == COMM_DIR_RX) || (mode == COMM_DIR_TX)))
 132                 return -EINVAL;
 133
 134         get_cmxucr_reg(ucc_num, &cmxucr, &reg_num, &shift);
 135
 136         switch (reg_num) {
 137         case 1:
 138                 switch (clock) {
 139                 case QE_BRG1:   clock_bits = 1; break;
 140                 case QE_BRG2:   clock_bits = 2; break;
 141                 case QE_BRG7:   clock_bits = 3; break;
 142                 case QE_BRG8:   clock_bits = 4; break;
 143                 case QE_CLK9:   clock_bits = 5; break;
 144                 case QE_CLK10:  clock_bits = 6; break;
 145                 case QE_CLK11:  clock_bits = 7; break;
 146                 case QE_CLK12:  clock_bits = 8; break;
 147                 case QE_CLK15:  clock_bits = 9; break;
 148                 case QE_CLK16:  clock_bits = 10; break;
 149                 default: break;
 150                 }
 151                 break;
 152         case 2:
 153                 switch (clock) {
 154                 case QE_BRG5:   clock_bits = 1; break;
 155                 case QE_BRG6:   clock_bits = 2; break;
 156                 case QE_BRG7:   clock_bits = 3; break;
 157                 case QE_BRG8:   clock_bits = 4; break;
 158                 case QE_CLK13:  clock_bits = 5; break;
 159                 case QE_CLK14:  clock_bits = 6; break;
 160                 case QE_CLK19:  clock_bits = 7; break;
 161                 case QE_CLK20:  clock_bits = 8; break;
 162                 case QE_CLK15:  clock_bits = 9; break;
 163                 case QE_CLK16:  clock_bits = 10; break;
 164                 default: break;
 165                 }
 166                 break;
 167         case 3:
 168                 switch (clock) {
 169                 case QE_BRG9:   clock_bits = 1; break;
 170                 case QE_BRG10:  clock_bits = 2; break;
 171                 case QE_BRG15:  clock_bits = 3; break;
 172                 case QE_BRG16:  clock_bits = 4; break;
 173                 case QE_CLK3:   clock_bits = 5; break;
 174                 case QE_CLK4:   clock_bits = 6; break;
 175                 case QE_CLK17:  clock_bits = 7; break;
 176                 case QE_CLK18:  clock_bits = 8; break;
 177                 case QE_CLK7:   clock_bits = 9; break;
 178                 case QE_CLK8:   clock_bits = 10; break;
 179                 case QE_CLK16:  clock_bits = 11; break;
 180                 default: break;
 181                 }
 182                 break;
 183         case 4:
 184                 switch (clock) {
 185                 case QE_BRG13:  clock_bits = 1; break;
 186                 case QE_BRG14:  clock_bits = 2; break;
 187                 case QE_BRG15:  clock_bits = 3; break;
 188                 case QE_BRG16:  clock_bits = 4; break;
 189                 case QE_CLK5:   clock_bits = 5; break;
 190                 case QE_CLK6:   clock_bits = 6; break;
 191                 case QE_CLK21:  clock_bits = 7; break;
 192                 case QE_CLK22:  clock_bits = 8; break;
 193                 case QE_CLK7:   clock_bits = 9; break;
 194                 case QE_CLK8:   clock_bits = 10; break;
 195                 case QE_CLK16:  clock_bits = 11; break;
 196                 default: break;
 197                 }
 198                 break;
 199         default: break;
 200         }
 201
 202         /* Check for invalid combination of clock and UCC number */
 203         if (!clock_bits)
 204                 return -ENOENT;
 205
 206         if (mode == COMM_DIR_RX)
 207                 shift += 4;
 208
 209         clrsetbits_be32(cmxucr, QE_CMXUCR_TX_CLK_SRC_MASK << shift,
 210                 clock_bits << shift);
 211
 212         return 0;
 213 }