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 <plat/orion-gpio.h> |
17 | #include <plat/mpp.h> |
18 | |
19 | /* Address of the ith MPP control register */ |
20 | static __init void __iomem *mpp_ctrl_addr(unsigned int i, |
21 | void __iomem *dev_bus) |
22 | { |
23 | return dev_bus + (i) * 4; |
24 | } |
25 | |
26 | |
27 | void __init orion_mpp_conf(unsigned int *mpp_list, unsigned int variant_mask, |
28 | unsigned int mpp_max, void __iomem *dev_bus) |
29 | { |
30 | unsigned int mpp_nr_regs = (1 + mpp_max/8); |
31 | u32 mpp_ctrl[8]; |
32 | int i; |
33 | |
34 | printk(KERN_DEBUG "initial MPP regs:" ); |
35 | if (mpp_nr_regs > ARRAY_SIZE(mpp_ctrl)) { |
36 | printk(KERN_ERR "orion_mpp_conf: invalid mpp_max\n" ); |
37 | return; |
38 | } |
39 | |
40 | for (i = 0; i < mpp_nr_regs; i++) { |
41 | mpp_ctrl[i] = readl(addr: mpp_ctrl_addr(i, dev_bus)); |
42 | printk(" %08x" , mpp_ctrl[i]); |
43 | } |
44 | printk("\n" ); |
45 | |
46 | for ( ; *mpp_list; mpp_list++) { |
47 | unsigned int num = MPP_NUM(*mpp_list); |
48 | unsigned int sel = MPP_SEL(*mpp_list); |
49 | int shift, gpio_mode; |
50 | |
51 | if (num > mpp_max) { |
52 | printk(KERN_ERR "orion_mpp_conf: invalid MPP " |
53 | "number (%u)\n" , num); |
54 | continue; |
55 | } |
56 | if (variant_mask && !(*mpp_list & variant_mask)) { |
57 | printk(KERN_WARNING |
58 | "orion_mpp_conf: requested MPP%u config " |
59 | "unavailable on this hardware\n" , num); |
60 | continue; |
61 | } |
62 | |
63 | shift = (num & 7) << 2; |
64 | mpp_ctrl[num / 8] &= ~(0xf << shift); |
65 | mpp_ctrl[num / 8] |= sel << shift; |
66 | |
67 | gpio_mode = 0; |
68 | if (*mpp_list & MPP_INPUT_MASK) |
69 | gpio_mode |= GPIO_INPUT_OK; |
70 | if (*mpp_list & MPP_OUTPUT_MASK) |
71 | gpio_mode |= GPIO_OUTPUT_OK; |
72 | |
73 | orion_gpio_set_valid(num, gpio_mode); |
74 | } |
75 | |
76 | printk(KERN_DEBUG " final MPP regs:" ); |
77 | for (i = 0; i < mpp_nr_regs; i++) { |
78 | writel(val: mpp_ctrl[i], addr: mpp_ctrl_addr(i, dev_bus)); |
79 | printk(" %08x" , mpp_ctrl[i]); |
80 | } |
81 | printk("\n" ); |
82 | } |
83 | |