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(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(mpp_ctrl[i], mpp_ctrl_addr(i, dev_bus));
79 printk(" %08x", mpp_ctrl[i]);
80 }
81 printk("\n");
82 }
83
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