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
mv78xx0_variant(void)20 static 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
mv78xx0_mpp_conf(unsigned int * mpp_list)37 void __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 printk(KERN_DEBUG "initial MPP regs:");
48 for (i = 0; i < MPP_NR_REGS; i++) {
49 mpp_ctrl[i] = readl(MPP_CTRL(i));
50 printk(" %08x", mpp_ctrl[i]);
51 }
52 printk("\n");
53
54 for ( ; *mpp_list; mpp_list++) {
55 unsigned int num = MPP_NUM(*mpp_list);
56 unsigned int sel = MPP_SEL(*mpp_list);
57 int shift, gpio_mode;
58
59 if (num > MPP_MAX) {
60 printk(KERN_ERR "mv78xx0_mpp_conf: invalid MPP "
61 "number (%u)\n", num);
62 continue;
63 }
64 if (!(*mpp_list & variant_mask)) {
65 printk(KERN_WARNING
66 "mv78xx0_mpp_conf: requested MPP%u config "
67 "unavailable on this hardware\n", num);
68 continue;
69 }
70
71 shift = (num & 7) << 2;
72 mpp_ctrl[num / 8] &= ~(0xf << shift);
73 mpp_ctrl[num / 8] |= sel << shift;
74
75 gpio_mode = 0;
76 if (*mpp_list & MPP_INPUT_MASK)
77 gpio_mode |= GPIO_INPUT_OK;
78 if (*mpp_list & MPP_OUTPUT_MASK)
79 gpio_mode |= GPIO_OUTPUT_OK;
80 if (sel != 0)
81 gpio_mode = 0;
82 orion_gpio_set_valid(num, gpio_mode);
83 }
84
85 printk(KERN_DEBUG " final MPP regs:");
86 for (i = 0; i < MPP_NR_REGS; i++) {
87 writel(mpp_ctrl[i], MPP_CTRL(i));
88 printk(" %08x", mpp_ctrl[i]);
89 }
90 printk("\n");
91 }
92