projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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); | |
| 31 | u32 mpp_ctrl[mpp_nr_regs]; | |
| 32 | int i; | |
| 33 | ||
| b2f427a1 AL |
34 | printk(KERN_DEBUG "initial MPP regs:"); |
| 35 | for (i = 0; i < mpp_nr_regs; i++) { | |
| 36 | mpp_ctrl[i] = readl(mpp_ctrl_addr(i, dev_bus)); | |
| 37 | printk(" %08x", mpp_ctrl[i]); | |
| 38 | } | |
| 39 | printk("\n"); | |
| 40 | ||
| 41 | for ( ; *mpp_list; mpp_list++) { | |
| 42 | unsigned int num = MPP_NUM(*mpp_list); | |
| 43 | unsigned int sel = MPP_SEL(*mpp_list); | |
| 44 | int shift, gpio_mode; | |
| 45 | ||
| 46 | if (num > mpp_max) { | |
| 47 | printk(KERN_ERR "orion_mpp_conf: invalid MPP " | |
| 48 | "number (%u)\n", num); | |
| 49 | continue; | |
| 50 | } | |
| 830f8b91 | 51 | if (variant_mask && !(*mpp_list & variant_mask)) { |
| b2f427a1 AL |
52 | printk(KERN_WARNING |
| 53 | "orion_mpp_conf: requested MPP%u config " | |
| 54 | "unavailable on this hardware\n", num); | |
| 55 | continue; | |
| 56 | } | |
| 57 | ||
| 58 | shift = (num & 7) << 2; | |
| 59 | mpp_ctrl[num / 8] &= ~(0xf << shift); | |
| 60 | mpp_ctrl[num / 8] |= sel << shift; | |
| 61 | ||
| 62 | gpio_mode = 0; | |
| 63 | if (*mpp_list & MPP_INPUT_MASK) | |
| 64 | gpio_mode |= GPIO_INPUT_OK; | |
| 65 | if (*mpp_list & MPP_OUTPUT_MASK) | |
| 66 | gpio_mode |= GPIO_OUTPUT_OK; | |
| b0654037 | 67 | |
| b2f427a1 AL |
68 | orion_gpio_set_valid(num, gpio_mode); |
| 69 | } | |
| 70 | ||
| 71 | printk(KERN_DEBUG " final MPP regs:"); | |
| 72 | for (i = 0; i < mpp_nr_regs; i++) { | |
| 73 | writel(mpp_ctrl[i], mpp_ctrl_addr(i, dev_bus)); | |
| 74 | printk(" %08x", mpp_ctrl[i]); | |
| 75 | } | |
| 76 | printk("\n"); | |
| 77 | } |