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