1 /* 2 * arch/arm/plat-orion/mpp.c 3 * 4 * MPP functions for Marvell orion 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 <linux/gpio.h> 16 #include <plat/orion-gpio.h> 17 #include <plat/mpp.h> 18 19 /* Address of the ith MPP control register */ 20 static __init void __iomem *mpp_ctrl_addr(unsigned int i, 21 void __iomem *dev_bus) 22 { 23 return dev_bus + (i) * 4; 24 } 25 26 27 void __init orion_mpp_conf(unsigned int *mpp_list, unsigned int variant_mask, 28 unsigned int mpp_max, void __iomem *dev_bus) 29 { 30 unsigned int mpp_nr_regs = (1 + mpp_max/8); 31 u32 mpp_ctrl[8]; 32 int i; 33 34 printk(KERN_DEBUG "initial MPP regs:"); 35 if (mpp_nr_regs > ARRAY_SIZE(mpp_ctrl)) { 36 printk(KERN_ERR "orion_mpp_conf: invalid mpp_max\n"); 37 return; 38 } 39 40 for (i = 0; i < mpp_nr_regs; i++) { 41 mpp_ctrl[i] = readl(mpp_ctrl_addr(i, dev_bus)); 42 printk(" %08x", mpp_ctrl[i]); 43 } 44 printk("\n"); 45 46 for ( ; *mpp_list; mpp_list++) { 47 unsigned int num = MPP_NUM(*mpp_list); 48 unsigned int sel = MPP_SEL(*mpp_list); 49 int shift, gpio_mode; 50 51 if (num > mpp_max) { 52 printk(KERN_ERR "orion_mpp_conf: invalid MPP " 53 "number (%u)\n", num); 54 continue; 55 } 56 if (variant_mask && !(*mpp_list & variant_mask)) { 57 printk(KERN_WARNING 58 "orion_mpp_conf: requested MPP%u config " 59 "unavailable on this hardware\n", num); 60 continue; 61 } 62 63 shift = (num & 7) << 2; 64 mpp_ctrl[num / 8] &= ~(0xf << shift); 65 mpp_ctrl[num / 8] |= sel << shift; 66 67 gpio_mode = 0; 68 if (*mpp_list & MPP_INPUT_MASK) 69 gpio_mode |= GPIO_INPUT_OK; 70 if (*mpp_list & MPP_OUTPUT_MASK) 71 gpio_mode |= GPIO_OUTPUT_OK; 72 73 orion_gpio_set_valid(num, gpio_mode); 74 } 75 76 printk(KERN_DEBUG " final MPP regs:"); 77 for (i = 0; i < mpp_nr_regs; i++) { 78 writel(mpp_ctrl[i], mpp_ctrl_addr(i, dev_bus)); 79 printk(" %08x", mpp_ctrl[i]); 80 } 81 printk("\n"); 82 } 83