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 */
21static __init void __iomem *mpp_ctrl_addr(unsigned int i,
22					  void __iomem *dev_bus)
23{
24	return dev_bus + (i) * 4;
25}
26
27
28void __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