Root/arch/arm/mach-mv78xx0/mpp.c

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
20static 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
37void __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

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