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 */
mpp_ctrl_addr(unsigned int i,void __iomem * dev_bus)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 
orion_mpp_conf(unsigned int * mpp_list,unsigned int variant_mask,unsigned int mpp_max,void __iomem * dev_bus)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