1 /*
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
kirkwood_variant(void)20 static unsigned int __init kirkwood_variant(void)
21 {
22 u32 dev, rev;
23
24 kirkwood_pcie_id(&dev, &rev);
25
26 if ((dev == MV88F6281_DEV_ID && rev >= MV88F6281_REV_A0) ||
27 (dev == MV88F6282_DEV_ID))
28 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
kirkwood_mpp_conf(unsigned int * mpp_list)42 void __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
52 printk(KERN_DEBUG "initial MPP regs:");
53 for (i = 0; i < MPP_NR_REGS; i++) {
54 mpp_ctrl[i] = readl(MPP_CTRL(i));
55 printk(" %08x", mpp_ctrl[i]);
56 }
57 printk("\n");
58
59 for ( ; *mpp_list; mpp_list++) {
60 unsigned int num = MPP_NUM(*mpp_list);
61 unsigned int sel = MPP_SEL(*mpp_list);
62 int shift, gpio_mode;
63
64 if (num > MPP_MAX) {
65 printk(KERN_ERR "kirkwood_mpp_conf: invalid MPP "
66 "number (%u)\n", num);
67 continue;
68 }
69 if (!(*mpp_list & variant_mask)) {
70 printk(KERN_WARNING
71 "kirkwood_mpp_conf: requested MPP%u config "
72 "unavailable on this hardware\n", num);
73 continue;
74 }
75
76 shift = (num & 7) << 2;
77 mpp_ctrl[num / 8] &= ~(0xf << shift);
78 mpp_ctrl[num / 8] |= sel << shift;
79
80 gpio_mode = 0;
81 if (*mpp_list & MPP_INPUT_MASK)
82 gpio_mode |= GPIO_INPUT_OK;
83 if (*mpp_list & MPP_OUTPUT_MASK)
84 gpio_mode |= GPIO_OUTPUT_OK;
85 if (sel != 0)
86 gpio_mode = 0;
87 orion_gpio_set_valid(num, gpio_mode);
88 }
89
90 printk(KERN_DEBUG " final MPP regs:");
91 for (i = 0; i < MPP_NR_REGS; i++) {
92 writel(mpp_ctrl[i], MPP_CTRL(i));
93 printk(" %08x", mpp_ctrl[i]);
94 }
95 printk("\n");
96 }
97