blob: 27901f702feb28d5f4c5a0ff6ce9acbc0780af9d [file] [log] [blame]
Nicolas Pitre0100def2009-01-30 22:44:20 -05001/*
2 * arch/arm/mach-kirkwood/mpp.c
3 *
4 * MPP functions for Marvell Kirkwood 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 kirkwood_variant(void)
21{
22 u32 dev, rev;
23
24 kirkwood_pcie_id(&dev, &rev);
25
Saeed Bishara1e4d2d32010-06-01 18:09:27 +030026 if ((dev == MV88F6281_DEV_ID && rev >= MV88F6281_REV_A0) ||
27 (dev == MV88F6282_DEV_ID))
Nicolas Pitre0100def2009-01-30 22:44:20 -050028 return MPP_F6281_MASK;
29 if (dev == MV88F6192_DEV_ID && rev >= MV88F6192_REV_A0)
30 return MPP_F6192_MASK;
31 if (dev == MV88F6180_DEV_ID)
32 return MPP_F6180_MASK;
33
34 printk(KERN_ERR "MPP setup: unknown kirkwood variant "
35 "(dev %#x rev %#x)\n", dev, rev);
36 return 0;
37}
38
39#define MPP_CTRL(i) (DEV_BUS_VIRT_BASE + (i) * 4)
40#define MPP_NR_REGS (1 + MPP_MAX/8)
41
42void __init kirkwood_mpp_conf(unsigned int *mpp_list)
43{
44 u32 mpp_ctrl[MPP_NR_REGS];
45 unsigned int variant_mask;
46 int i;
47
48 variant_mask = kirkwood_variant();
49 if (!variant_mask)
50 return;
51
Erik Benadaa8865652009-05-28 17:08:55 -070052 /* Initialize gpiolib. */
53 orion_gpio_init();
54
Nicolas Pitre0100def2009-01-30 22:44:20 -050055 printk(KERN_DEBUG "initial MPP regs:");
56 for (i = 0; i < MPP_NR_REGS; i++) {
57 mpp_ctrl[i] = readl(MPP_CTRL(i));
58 printk(" %08x", mpp_ctrl[i]);
59 }
60 printk("\n");
61
Mike Rapoport7350f412010-11-03 17:22:00 +020062 for ( ; *mpp_list; mpp_list++) {
Nicolas Pitre0100def2009-01-30 22:44:20 -050063 unsigned int num = MPP_NUM(*mpp_list);
64 unsigned int sel = MPP_SEL(*mpp_list);
65 int shift, gpio_mode;
66
67 if (num > MPP_MAX) {
68 printk(KERN_ERR "kirkwood_mpp_conf: invalid MPP "
69 "number (%u)\n", num);
70 continue;
71 }
72 if (!(*mpp_list & variant_mask)) {
73 printk(KERN_WARNING
74 "kirkwood_mpp_conf: requested MPP%u config "
75 "unavailable on this hardware\n", num);
76 continue;
77 }
78
79 shift = (num & 7) << 2;
80 mpp_ctrl[num / 8] &= ~(0xf << shift);
81 mpp_ctrl[num / 8] |= sel << shift;
82
83 gpio_mode = 0;
84 if (*mpp_list & MPP_INPUT_MASK)
85 gpio_mode |= GPIO_INPUT_OK;
86 if (*mpp_list & MPP_OUTPUT_MASK)
87 gpio_mode |= GPIO_OUTPUT_OK;
88 if (sel != 0)
89 gpio_mode = 0;
90 orion_gpio_set_valid(num, gpio_mode);
Nicolas Pitre0100def2009-01-30 22:44:20 -050091 }
92
93 printk(KERN_DEBUG " final MPP regs:");
94 for (i = 0; i < MPP_NR_REGS; i++) {
95 writel(mpp_ctrl[i], MPP_CTRL(i));
96 printk(" %08x", mpp_ctrl[i]);
97 }
98 printk("\n");
99}