arch/arm/mach-orion5x/mpp.c

   1 /*
   2  * arch/arm/mach-orion5x/mpp.c
   3  *
   4  * MPP functions for Marvell Orion 5x SoCs
   5  *
   6  * This file is licensed under the terms of the GNU General Public
   7  * License version 2.  This program is licensed "as is" without any
   8  * warranty of any kind, whether express or implied.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/mbus.h>
  14 #include <linux/io.h>
  15 #include <asm/gpio.h>
  16 #include <mach/hardware.h>
  17 #include "common.h"
  18 #include "mpp.h"
  19
  20 static int is_5181l(void)
  21 {
  22         u32 dev;
  23         u32 rev;
  24
  25         orion5x_pcie_id(&dev, &rev);
  26
  27         return !!(dev == MV88F5181_DEV_ID && rev >= MV88F5181L_REV_A0);
  28 }
  29
  30 static int is_5182(void)
  31 {
  32         u32 dev;
  33         u32 rev;
  34
  35         orion5x_pcie_id(&dev, &rev);
  36
  37         return !!(dev == MV88F5182_DEV_ID);
  38 }
  39
  40 static int is_5281(void)
  41 {
  42         u32 dev;
  43         u32 rev;
  44
  45         orion5x_pcie_id(&dev, &rev);
  46
  47         return !!(dev == MV88F5281_DEV_ID);
  48 }
  49
  50 static int __init determine_type_encoding(int mpp, enum orion5x_mpp_type type)
  51 {
  52         switch (type) {
  53         case MPP_UNUSED:
  54         case MPP_GPIO:
  55                 if (mpp == 0)
  56                         return 3;
  57                 if (mpp >= 1 && mpp <= 15)
  58                         return 0;
  59                 if (mpp >= 16 && mpp <= 19) {
  60                         if (is_5182())
  61                                 return 5;
  62                         if (type == MPP_UNUSED)
  63                                 return 0;
  64                 }
  65                 return -1;
  66
  67         case MPP_PCIE_RST_OUTn:
  68                 if (mpp == 0)
  69                         return 0;
  70                 return -1;
  71
  72         case MPP_PCI_ARB:
  73                 if (mpp >= 0 && mpp <= 7)
  74                         return 2;
  75                 return -1;
  76
  77         case MPP_PCI_PMEn:
  78                 if (mpp == 2)
  79                         return 3;
  80                 return -1;
  81
  82         case MPP_GIGE:
  83                 if (mpp >= 8 && mpp <= 19)
  84                         return 1;
  85                 return -1;
  86
  87         case MPP_NAND:
  88                 if (is_5182() || is_5281()) {
  89                         if (mpp >= 4 && mpp <= 7)
  90                                 return 4;
  91                         if (mpp >= 12 && mpp <= 17)
  92                                 return 4;
  93                 }
  94                 return -1;
  95
  96         case MPP_PCI_CLK:
  97                 if (is_5181l() && mpp >= 6 && mpp <= 7)
  98                         return 5;
  99                 return -1;
 100
 101         case MPP_SATA_LED:
 102                 if (is_5182()) {
 103                         if (mpp >= 4 && mpp <= 7)
 104                                 return 5;
 105                         if (mpp >= 12 && mpp <= 15)
 106                                 return 5;
 107                 }
 108                 return -1;
 109
 110         case MPP_UART:
 111                 if (mpp >= 16 && mpp <= 19)
 112                         return 0;
 113                 return -1;
 114         }
 115
 116         printk(KERN_INFO "unknown MPP type %d\n", type);
 117
 118         return -1;
 119 }
 120
 121 void __init orion5x_mpp_conf(struct orion5x_mpp_mode *mode)
 122 {
 123         u32 mpp_0_7_ctrl = readl(MPP_0_7_CTRL);
 124         u32 mpp_8_15_ctrl = readl(MPP_8_15_CTRL);
 125         u32 mpp_16_19_ctrl = readl(MPP_16_19_CTRL);
 126
 127         /* Initialize gpiolib. */
 128         orion_gpio_init();
 129
 130         while (mode->mpp >= 0) {
 131                 u32 *reg;
 132                 int num_type;
 133                 int shift;
 134
 135                 if (mode->mpp >= 0 && mode->mpp <= 7)
 136                         reg = &mpp_0_7_ctrl;
 137                 else if (mode->mpp >= 8 && mode->mpp <= 15)
 138                         reg = &mpp_8_15_ctrl;
 139                 else if (mode->mpp >= 16 && mode->mpp <= 19)
 140                         reg = &mpp_16_19_ctrl;
 141                 else {
 142                         printk(KERN_ERR "orion5x_mpp_conf: invalid MPP "
 143                                         "(%d)\n", mode->mpp);
 144                         continue;
 145                 }
 146
 147                 num_type = determine_type_encoding(mode->mpp, mode->type);
 148                 if (num_type < 0) {
 149                         printk(KERN_ERR "orion5x_mpp_conf: invalid MPP "
 150                                         "combination (%d, %d)\n", mode->mpp,
 151                                         mode->type);
 152                         continue;
 153                 }
 154
 155                 shift = (mode->mpp & 7) << 2;
 156                 *reg &= ~(0xf << shift);
 157                 *reg |= (num_type & 0xf) << shift;
 158
 159                 if (mode->type == MPP_UNUSED && (mode->mpp < 16 || is_5182()))
 160                         orion_gpio_set_unused(mode->mpp);
 161
 162                 orion_gpio_set_valid(mode->mpp, !!(mode->type == MPP_GPIO));
 163
 164                 mode++;
 165         }
 166
 167         writel(mpp_0_7_ctrl, MPP_0_7_CTRL);
 168         writel(mpp_8_15_ctrl, MPP_8_15_CTRL);
 169         writel(mpp_16_19_ctrl, MPP_16_19_CTRL);
 170 }