1 /* 2 * arch/arm/mach-mv78x00/mpp.c 3 * 4 * MPP functions for Marvell MV78x00 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 unsigned int __init mv78xx0_variant(void) 21 { 22 u32 dev, rev; 23 24 mv78xx0_pcie_id(&dev, &rev); 25 26 if (dev == MV78100_DEV_ID && rev >= MV78100_REV_A0) 27 return MPP_78100_A0_MASK; 28 29 printk(KERN_ERR "MPP setup: unknown mv78x00 variant " 30 "(dev %#x rev %#x)\n", dev, rev); 31 return 0; 32 } 33 34 #define MPP_CTRL(i) (DEV_BUS_VIRT_BASE + (i) * 4) 35 #define MPP_NR_REGS (1 + MPP_MAX/8) 36 37 void __init mv78xx0_mpp_conf(unsigned int *mpp_list) 38 { 39 u32 mpp_ctrl[MPP_NR_REGS]; 40 unsigned int variant_mask; 41 int i; 42 43 variant_mask = mv78xx0_variant(); 44 if (!variant_mask) 45 return; 46 47 /* Initialize gpiolib. */ 48 orion_gpio_init(); 49 50 printk(KERN_DEBUG "initial MPP regs:"); 51 for (i = 0; i < MPP_NR_REGS; i++) { 52 mpp_ctrl[i] = readl(MPP_CTRL(i)); 53 printk(" %08x", mpp_ctrl[i]); 54 } 55 printk("\n"); 56 57 for ( ; *mpp_list; mpp_list++) { 58 unsigned int num = MPP_NUM(*mpp_list); 59 unsigned int sel = MPP_SEL(*mpp_list); 60 int shift, gpio_mode; 61 62 if (num > MPP_MAX) { 63 printk(KERN_ERR "mv78xx0_mpp_conf: invalid MPP " 64 "number (%u)\n", num); 65 continue; 66 } 67 if (!(*mpp_list & variant_mask)) { 68 printk(KERN_WARNING 69 "mv78xx0_mpp_conf: requested MPP%u config " 70 "unavailable on this hardware\n", num); 71 continue; 72 } 73 74 shift = (num & 7) << 2; 75 mpp_ctrl[num / 8] &= ~(0xf << shift); 76 mpp_ctrl[num / 8] |= sel << shift; 77 78 gpio_mode = 0; 79 if (*mpp_list & MPP_INPUT_MASK) 80 gpio_mode |= GPIO_INPUT_OK; 81 if (*mpp_list & MPP_OUTPUT_MASK) 82 gpio_mode |= GPIO_OUTPUT_OK; 83 if (sel != 0) 84 gpio_mode = 0; 85 orion_gpio_set_valid(num, gpio_mode); 86 } 87 88 printk(KERN_DEBUG " final MPP regs:"); 89 for (i = 0; i < MPP_NR_REGS; i++) { 90 writel(mpp_ctrl[i], MPP_CTRL(i)); 91 printk(" %08x", mpp_ctrl[i]); 92 } 93 printk("\n"); 94 } 95