blob: 354ac514eb899125121eb84127bcb93deac2a115 [file] [log] [blame]
Sebastien Requiemee40cea2010-02-23 14:38:14 +01001/*
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 while (*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 mpp_list++;
88 }
89
90 printk(KERN_DEBUG " final MPP regs:");
91 for (i = 0; i < MPP_NR_REGS; i++) {
92 writel(mpp_ctrl[i], MPP_CTRL(i));
93 printk(" %08x", mpp_ctrl[i]);
94 }
95 printk("\n");
96}