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b2f427a1 AL |
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> | |
ce91574c | 16 | #include <plat/orion-gpio.h> |
b2f427a1 AL |
17 | #include <plat/mpp.h> |
18 | ||
19 | /* Address of the ith MPP control register */ | |
5a2f5501 TP |
20 | static __init void __iomem *mpp_ctrl_addr(unsigned int i, |
21 | void __iomem *dev_bus) | |
b2f427a1 AL |
22 | { |
23 | return dev_bus + (i) * 4; | |
24 | } | |
25 | ||
26 | ||
27 | void __init orion_mpp_conf(unsigned int *mpp_list, unsigned int variant_mask, | |
5a2f5501 | 28 | unsigned int mpp_max, void __iomem *dev_bus) |
b2f427a1 AL |
29 | { |
30 | unsigned int mpp_nr_regs = (1 + mpp_max/8); | |
d4f79cb8 | 31 | u32 mpp_ctrl[8]; |
b2f427a1 AL |
32 | int i; |
33 | ||
b2f427a1 | 34 | printk(KERN_DEBUG "initial MPP regs:"); |
d4f79cb8 AB |
35 | if (mpp_nr_regs > ARRAY_SIZE(mpp_ctrl)) { |
36 | printk(KERN_ERR "orion_mpp_conf: invalid mpp_max\n"); | |
37 | return; | |
38 | } | |
39 | ||
b2f427a1 AL |
40 | for (i = 0; i < mpp_nr_regs; i++) { |
41 | mpp_ctrl[i] = readl(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 | } | |
830f8b91 | 56 | if (variant_mask && !(*mpp_list & variant_mask)) { |
b2f427a1 AL |
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; | |
b0654037 | 72 | |
b2f427a1 AL |
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(mpp_ctrl[i], mpp_ctrl_addr(i, dev_bus)); | |
79 | printk(" %08x", mpp_ctrl[i]); | |
80 | } | |
81 | printk("\n"); | |
82 | } |