2 * arch/arm/mach-kirkwood/mpp.c
4 * MPP functions for Marvell Kirkwood SoCs
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.
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/mbus.h>
16 #include <mach/hardware.h>
20 static unsigned int __init kirkwood_variant(void)
24 kirkwood_pcie_id(&dev, &rev);
26 if (dev == MV88F6281_DEV_ID && rev >= MV88F6281_REV_A0)
27 return MPP_F6281_MASK;
28 if (dev == MV88F6192_DEV_ID && rev >= MV88F6192_REV_A0)
29 return MPP_F6192_MASK;
30 if (dev == MV88F6180_DEV_ID)
31 return MPP_F6180_MASK;
33 printk(KERN_ERR "MPP setup: unknown kirkwood variant "
34 "(dev %#x rev %#x)\n", dev, rev);
38 #define MPP_CTRL(i) (DEV_BUS_VIRT_BASE + (i) * 4)
39 #define MPP_NR_REGS (1 + MPP_MAX/8)
41 void __init kirkwood_mpp_conf(unsigned int *mpp_list)
43 u32 mpp_ctrl[MPP_NR_REGS];
44 unsigned int variant_mask;
47 variant_mask = kirkwood_variant();
51 /* Initialize gpiolib. */
54 printk(KERN_DEBUG "initial MPP regs:");
55 for (i = 0; i < MPP_NR_REGS; i++) {
56 mpp_ctrl[i] = readl(MPP_CTRL(i));
57 printk(" %08x", mpp_ctrl[i]);
62 unsigned int num = MPP_NUM(*mpp_list);
63 unsigned int sel = MPP_SEL(*mpp_list);
67 printk(KERN_ERR "kirkwood_mpp_conf: invalid MPP "
68 "number (%u)\n", num);
71 if (!(*mpp_list & variant_mask)) {
73 "kirkwood_mpp_conf: requested MPP%u config "
74 "unavailable on this hardware\n", num);
78 shift = (num & 7) << 2;
79 mpp_ctrl[num / 8] &= ~(0xf << shift);
80 mpp_ctrl[num / 8] |= sel << shift;
83 if (*mpp_list & MPP_INPUT_MASK)
84 gpio_mode |= GPIO_INPUT_OK;
85 if (*mpp_list & MPP_OUTPUT_MASK)
86 gpio_mode |= GPIO_OUTPUT_OK;
89 orion_gpio_set_valid(num, gpio_mode);
94 printk(KERN_DEBUG " final MPP regs:");
95 for (i = 0; i < MPP_NR_REGS; i++) {
96 writel(mpp_ctrl[i], MPP_CTRL(i));
97 printk(" %08x", mpp_ctrl[i]);