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 */
20static __init void __iomem *mpp_ctrl_addr(unsigned int i,
21					  void __iomem *dev_bus)
22{
23	return dev_bus + (i) * 4;
24}
25
26
27void __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