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 printk(KERN_DEBUG "initial MPP regs:"); 48 for (i = 0; i < MPP_NR_REGS; i++) { 49 mpp_ctrl[i] = readl(MPP_CTRL(i)); 50 printk(" %08x", mpp_ctrl[i]); 51 } 52 printk("\n"); 53 54 for ( ; *mpp_list; mpp_list++) { 55 unsigned int num = MPP_NUM(*mpp_list); 56 unsigned int sel = MPP_SEL(*mpp_list); 57 int shift, gpio_mode; 58 59 if (num > MPP_MAX) { 60 printk(KERN_ERR "mv78xx0_mpp_conf: invalid MPP " 61 "number (%u)\n", num); 62 continue; 63 } 64 if (!(*mpp_list & variant_mask)) { 65 printk(KERN_WARNING 66 "mv78xx0_mpp_conf: requested MPP%u config " 67 "unavailable on this hardware\n", num); 68 continue; 69 } 70 71 shift = (num & 7) << 2; 72 mpp_ctrl[num / 8] &= ~(0xf << shift); 73 mpp_ctrl[num / 8] |= sel << shift; 74 75 gpio_mode = 0; 76 if (*mpp_list & MPP_INPUT_MASK) 77 gpio_mode |= GPIO_INPUT_OK; 78 if (*mpp_list & MPP_OUTPUT_MASK) 79 gpio_mode |= GPIO_OUTPUT_OK; 80 if (sel != 0) 81 gpio_mode = 0; 82 orion_gpio_set_valid(num, gpio_mode); 83 } 84 85 printk(KERN_DEBUG " final MPP regs:"); 86 for (i = 0; i < MPP_NR_REGS; i++) { 87 writel(mpp_ctrl[i], MPP_CTRL(i)); 88 printk(" %08x", mpp_ctrl[i]); 89 } 90 printk("\n"); 91 } 92