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82 lines
2.0 KiB
82 lines
2.0 KiB
/* |
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* arch/arm/plat-orion/mpp.c |
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* |
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* MPP functions for Marvell orion SoCs |
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* |
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* This file is licensed under the terms of the GNU General Public |
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* License version 2. This program is licensed "as is" without any |
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* warranty of any kind, whether express or implied. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/mbus.h> |
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#include <linux/io.h> |
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#include <linux/gpio.h> |
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#include <plat/orion-gpio.h> |
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#include <plat/mpp.h> |
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/* Address of the ith MPP control register */ |
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static __init void __iomem *mpp_ctrl_addr(unsigned int i, |
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void __iomem *dev_bus) |
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{ |
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return dev_bus + (i) * 4; |
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} |
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void __init orion_mpp_conf(unsigned int *mpp_list, unsigned int variant_mask, |
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unsigned int mpp_max, void __iomem *dev_bus) |
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{ |
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unsigned int mpp_nr_regs = (1 + mpp_max/8); |
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u32 mpp_ctrl[8]; |
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int i; |
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printk(KERN_DEBUG "initial MPP regs:"); |
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if (mpp_nr_regs > ARRAY_SIZE(mpp_ctrl)) { |
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printk(KERN_ERR "orion_mpp_conf: invalid mpp_max\n"); |
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return; |
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} |
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for (i = 0; i < mpp_nr_regs; i++) { |
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mpp_ctrl[i] = readl(mpp_ctrl_addr(i, dev_bus)); |
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printk(" %08x", mpp_ctrl[i]); |
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} |
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printk("\n"); |
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for ( ; *mpp_list; mpp_list++) { |
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unsigned int num = MPP_NUM(*mpp_list); |
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unsigned int sel = MPP_SEL(*mpp_list); |
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int shift, gpio_mode; |
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if (num > mpp_max) { |
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printk(KERN_ERR "orion_mpp_conf: invalid MPP " |
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"number (%u)\n", num); |
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continue; |
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} |
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if (variant_mask && !(*mpp_list & variant_mask)) { |
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printk(KERN_WARNING |
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"orion_mpp_conf: requested MPP%u config " |
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"unavailable on this hardware\n", num); |
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continue; |
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} |
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shift = (num & 7) << 2; |
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mpp_ctrl[num / 8] &= ~(0xf << shift); |
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mpp_ctrl[num / 8] |= sel << shift; |
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gpio_mode = 0; |
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if (*mpp_list & MPP_INPUT_MASK) |
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gpio_mode |= GPIO_INPUT_OK; |
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if (*mpp_list & MPP_OUTPUT_MASK) |
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gpio_mode |= GPIO_OUTPUT_OK; |
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orion_gpio_set_valid(num, gpio_mode); |
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} |
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printk(KERN_DEBUG " final MPP regs:"); |
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for (i = 0; i < mpp_nr_regs; i++) { |
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writel(mpp_ctrl[i], mpp_ctrl_addr(i, dev_bus)); |
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printk(" %08x", mpp_ctrl[i]); |
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} |
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printk("\n"); |
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}
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