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282 lines
7.5 KiB
282 lines
7.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/arch/arm/plat-pxa/mfp.c |
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* |
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* Multi-Function Pin Support |
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* |
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* Copyright (C) 2007 Marvell Internation Ltd. |
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* |
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* 2007-08-21: eric miao <[email protected]> |
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* initial version |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <plat/mfp.h> |
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#define MFPR_SIZE (PAGE_SIZE) |
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/* MFPR register bit definitions */ |
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#define MFPR_PULL_SEL (0x1 << 15) |
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#define MFPR_PULLUP_EN (0x1 << 14) |
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#define MFPR_PULLDOWN_EN (0x1 << 13) |
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#define MFPR_SLEEP_SEL (0x1 << 9) |
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#define MFPR_SLEEP_OE_N (0x1 << 7) |
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#define MFPR_EDGE_CLEAR (0x1 << 6) |
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#define MFPR_EDGE_FALL_EN (0x1 << 5) |
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#define MFPR_EDGE_RISE_EN (0x1 << 4) |
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#define MFPR_SLEEP_DATA(x) ((x) << 8) |
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#define MFPR_DRIVE(x) (((x) & 0x7) << 10) |
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#define MFPR_AF_SEL(x) (((x) & 0x7) << 0) |
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#define MFPR_EDGE_NONE (0) |
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#define MFPR_EDGE_RISE (MFPR_EDGE_RISE_EN) |
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#define MFPR_EDGE_FALL (MFPR_EDGE_FALL_EN) |
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#define MFPR_EDGE_BOTH (MFPR_EDGE_RISE | MFPR_EDGE_FALL) |
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/* |
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* Table that determines the low power modes outputs, with actual settings |
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* used in parentheses for don't-care values. Except for the float output, |
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* the configured driven and pulled levels match, so if there is a need for |
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* non-LPM pulled output, the same configuration could probably be used. |
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* |
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* Output value sleep_oe_n sleep_data pullup_en pulldown_en pull_sel |
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* (bit 7) (bit 8) (bit 14) (bit 13) (bit 15) |
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* |
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* Input 0 X(0) X(0) X(0) 0 |
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* Drive 0 0 0 0 X(1) 0 |
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* Drive 1 0 1 X(1) 0 0 |
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* Pull hi (1) 1 X(1) 1 0 0 |
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* Pull lo (0) 1 X(0) 0 1 0 |
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* Z (float) 1 X(0) 0 0 0 |
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*/ |
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#define MFPR_LPM_INPUT (0) |
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#define MFPR_LPM_DRIVE_LOW (MFPR_SLEEP_DATA(0) | MFPR_PULLDOWN_EN) |
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#define MFPR_LPM_DRIVE_HIGH (MFPR_SLEEP_DATA(1) | MFPR_PULLUP_EN) |
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#define MFPR_LPM_PULL_LOW (MFPR_LPM_DRIVE_LOW | MFPR_SLEEP_OE_N) |
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#define MFPR_LPM_PULL_HIGH (MFPR_LPM_DRIVE_HIGH | MFPR_SLEEP_OE_N) |
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#define MFPR_LPM_FLOAT (MFPR_SLEEP_OE_N) |
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#define MFPR_LPM_MASK (0xe080) |
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/* |
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* The pullup and pulldown state of the MFP pin at run mode is by default |
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* determined by the selected alternate function. In case that some buggy |
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* devices need to override this default behavior, the definitions below |
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* indicates the setting of corresponding MFPR bits |
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* |
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* Definition pull_sel pullup_en pulldown_en |
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* MFPR_PULL_NONE 0 0 0 |
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* MFPR_PULL_LOW 1 0 1 |
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* MFPR_PULL_HIGH 1 1 0 |
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* MFPR_PULL_BOTH 1 1 1 |
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* MFPR_PULL_FLOAT 1 0 0 |
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*/ |
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#define MFPR_PULL_NONE (0) |
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#define MFPR_PULL_LOW (MFPR_PULL_SEL | MFPR_PULLDOWN_EN) |
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#define MFPR_PULL_BOTH (MFPR_PULL_LOW | MFPR_PULLUP_EN) |
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#define MFPR_PULL_HIGH (MFPR_PULL_SEL | MFPR_PULLUP_EN) |
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#define MFPR_PULL_FLOAT (MFPR_PULL_SEL) |
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/* mfp_spin_lock is used to ensure that MFP register configuration |
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* (most likely a read-modify-write operation) is atomic, and that |
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* mfp_table[] is consistent |
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*/ |
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static DEFINE_SPINLOCK(mfp_spin_lock); |
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static void __iomem *mfpr_mmio_base; |
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struct mfp_pin { |
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unsigned long config; /* -1 for not configured */ |
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unsigned long mfpr_off; /* MFPRxx Register offset */ |
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unsigned long mfpr_run; /* Run-Mode Register Value */ |
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unsigned long mfpr_lpm; /* Low Power Mode Register Value */ |
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}; |
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static struct mfp_pin mfp_table[MFP_PIN_MAX]; |
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/* mapping of MFP_LPM_* definitions to MFPR_LPM_* register bits */ |
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static const unsigned long mfpr_lpm[] = { |
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MFPR_LPM_INPUT, |
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MFPR_LPM_DRIVE_LOW, |
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MFPR_LPM_DRIVE_HIGH, |
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MFPR_LPM_PULL_LOW, |
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MFPR_LPM_PULL_HIGH, |
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MFPR_LPM_FLOAT, |
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MFPR_LPM_INPUT, |
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}; |
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/* mapping of MFP_PULL_* definitions to MFPR_PULL_* register bits */ |
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static const unsigned long mfpr_pull[] = { |
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MFPR_PULL_NONE, |
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MFPR_PULL_LOW, |
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MFPR_PULL_HIGH, |
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MFPR_PULL_BOTH, |
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MFPR_PULL_FLOAT, |
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}; |
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/* mapping of MFP_LPM_EDGE_* definitions to MFPR_EDGE_* register bits */ |
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static const unsigned long mfpr_edge[] = { |
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MFPR_EDGE_NONE, |
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MFPR_EDGE_RISE, |
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MFPR_EDGE_FALL, |
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MFPR_EDGE_BOTH, |
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}; |
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#define mfpr_readl(off) \ |
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__raw_readl(mfpr_mmio_base + (off)) |
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#define mfpr_writel(off, val) \ |
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__raw_writel(val, mfpr_mmio_base + (off)) |
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#define mfp_configured(p) ((p)->config != -1) |
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/* |
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* perform a read-back of any valid MFPR register to make sure the |
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* previous writings are finished |
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*/ |
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static unsigned long mfpr_off_readback; |
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#define mfpr_sync() (void)__raw_readl(mfpr_mmio_base + mfpr_off_readback) |
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static inline void __mfp_config_run(struct mfp_pin *p) |
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{ |
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if (mfp_configured(p)) |
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mfpr_writel(p->mfpr_off, p->mfpr_run); |
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} |
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static inline void __mfp_config_lpm(struct mfp_pin *p) |
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{ |
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if (mfp_configured(p)) { |
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unsigned long mfpr_clr = (p->mfpr_run & ~MFPR_EDGE_BOTH) | MFPR_EDGE_CLEAR; |
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if (mfpr_clr != p->mfpr_run) |
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mfpr_writel(p->mfpr_off, mfpr_clr); |
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if (p->mfpr_lpm != mfpr_clr) |
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mfpr_writel(p->mfpr_off, p->mfpr_lpm); |
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} |
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} |
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void mfp_config(unsigned long *mfp_cfgs, int num) |
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{ |
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unsigned long flags; |
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int i; |
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spin_lock_irqsave(&mfp_spin_lock, flags); |
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for (i = 0; i < num; i++, mfp_cfgs++) { |
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unsigned long tmp, c = *mfp_cfgs; |
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struct mfp_pin *p; |
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int pin, af, drv, lpm, edge, pull; |
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pin = MFP_PIN(c); |
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BUG_ON(pin >= MFP_PIN_MAX); |
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p = &mfp_table[pin]; |
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af = MFP_AF(c); |
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drv = MFP_DS(c); |
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lpm = MFP_LPM_STATE(c); |
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edge = MFP_LPM_EDGE(c); |
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pull = MFP_PULL(c); |
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/* run-mode pull settings will conflict with MFPR bits of |
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* low power mode state, calculate mfpr_run and mfpr_lpm |
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* individually if pull != MFP_PULL_NONE |
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*/ |
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tmp = MFPR_AF_SEL(af) | MFPR_DRIVE(drv); |
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if (likely(pull == MFP_PULL_NONE)) { |
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p->mfpr_run = tmp | mfpr_lpm[lpm] | mfpr_edge[edge]; |
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p->mfpr_lpm = p->mfpr_run; |
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} else { |
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p->mfpr_lpm = tmp | mfpr_lpm[lpm] | mfpr_edge[edge]; |
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p->mfpr_run = tmp | mfpr_pull[pull]; |
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} |
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p->config = c; __mfp_config_run(p); |
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} |
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mfpr_sync(); |
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spin_unlock_irqrestore(&mfp_spin_lock, flags); |
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} |
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unsigned long mfp_read(int mfp) |
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{ |
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unsigned long val, flags; |
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BUG_ON(mfp < 0 || mfp >= MFP_PIN_MAX); |
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spin_lock_irqsave(&mfp_spin_lock, flags); |
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val = mfpr_readl(mfp_table[mfp].mfpr_off); |
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spin_unlock_irqrestore(&mfp_spin_lock, flags); |
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return val; |
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} |
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void mfp_write(int mfp, unsigned long val) |
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{ |
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unsigned long flags; |
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BUG_ON(mfp < 0 || mfp >= MFP_PIN_MAX); |
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spin_lock_irqsave(&mfp_spin_lock, flags); |
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mfpr_writel(mfp_table[mfp].mfpr_off, val); |
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mfpr_sync(); |
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spin_unlock_irqrestore(&mfp_spin_lock, flags); |
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} |
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void __init mfp_init_base(void __iomem *mfpr_base) |
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{ |
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int i; |
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/* initialize the table with default - unconfigured */ |
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for (i = 0; i < ARRAY_SIZE(mfp_table); i++) |
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mfp_table[i].config = -1; |
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mfpr_mmio_base = mfpr_base; |
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} |
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void __init mfp_init_addr(struct mfp_addr_map *map) |
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{ |
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struct mfp_addr_map *p; |
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unsigned long offset, flags; |
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int i; |
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spin_lock_irqsave(&mfp_spin_lock, flags); |
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/* mfp offset for readback */ |
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mfpr_off_readback = map[0].offset; |
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for (p = map; p->start != MFP_PIN_INVALID; p++) { |
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offset = p->offset; |
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i = p->start; |
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do { |
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mfp_table[i].mfpr_off = offset; |
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mfp_table[i].mfpr_run = 0; |
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mfp_table[i].mfpr_lpm = 0; |
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offset += 4; i++; |
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} while ((i <= p->end) && (p->end != -1)); |
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} |
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spin_unlock_irqrestore(&mfp_spin_lock, flags); |
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} |
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void mfp_config_lpm(void) |
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{ |
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struct mfp_pin *p = &mfp_table[0]; |
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int pin; |
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for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++, p++) |
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__mfp_config_lpm(p); |
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} |
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void mfp_config_run(void) |
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{ |
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struct mfp_pin *p = &mfp_table[0]; |
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int pin; |
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for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++, p++) |
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__mfp_config_run(p); |
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}
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