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Diffstat (limited to 'arch/arm/plat-pxa/mfp.c')
| -rw-r--r-- | arch/arm/plat-pxa/mfp.c | 282 |
1 files changed, 0 insertions, 282 deletions
diff --git a/arch/arm/plat-pxa/mfp.c b/arch/arm/plat-pxa/mfp.c deleted file mode 100644 index 17fc4f33f35b..000000000000 --- a/arch/arm/plat-pxa/mfp.c +++ /dev/null @@ -1,282 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * linux/arch/arm/plat-pxa/mfp.c - * - * Multi-Function Pin Support - * - * Copyright (C) 2007 Marvell Internation Ltd. - * - * 2007-08-21: eric miao <eric.miao@marvell.com> - * initial version - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/io.h> - -#include <plat/mfp.h> - -#define MFPR_SIZE (PAGE_SIZE) - -/* MFPR register bit definitions */ -#define MFPR_PULL_SEL (0x1 << 15) -#define MFPR_PULLUP_EN (0x1 << 14) -#define MFPR_PULLDOWN_EN (0x1 << 13) -#define MFPR_SLEEP_SEL (0x1 << 9) -#define MFPR_SLEEP_OE_N (0x1 << 7) -#define MFPR_EDGE_CLEAR (0x1 << 6) -#define MFPR_EDGE_FALL_EN (0x1 << 5) -#define MFPR_EDGE_RISE_EN (0x1 << 4) - -#define MFPR_SLEEP_DATA(x) ((x) << 8) -#define MFPR_DRIVE(x) (((x) & 0x7) << 10) -#define MFPR_AF_SEL(x) (((x) & 0x7) << 0) - -#define MFPR_EDGE_NONE (0) -#define MFPR_EDGE_RISE (MFPR_EDGE_RISE_EN) -#define MFPR_EDGE_FALL (MFPR_EDGE_FALL_EN) -#define MFPR_EDGE_BOTH (MFPR_EDGE_RISE | MFPR_EDGE_FALL) - -/* - * Table that determines the low power modes outputs, with actual settings - * used in parentheses for don't-care values. Except for the float output, - * the configured driven and pulled levels match, so if there is a need for - * non-LPM pulled output, the same configuration could probably be used. - * - * Output value sleep_oe_n sleep_data pullup_en pulldown_en pull_sel - * (bit 7) (bit 8) (bit 14) (bit 13) (bit 15) - * - * Input 0 X(0) X(0) X(0) 0 - * Drive 0 0 0 0 X(1) 0 - * Drive 1 0 1 X(1) 0 0 - * Pull hi (1) 1 X(1) 1 0 0 - * Pull lo (0) 1 X(0) 0 1 0 - * Z (float) 1 X(0) 0 0 0 - */ -#define MFPR_LPM_INPUT (0) -#define MFPR_LPM_DRIVE_LOW (MFPR_SLEEP_DATA(0) | MFPR_PULLDOWN_EN) -#define MFPR_LPM_DRIVE_HIGH (MFPR_SLEEP_DATA(1) | MFPR_PULLUP_EN) -#define MFPR_LPM_PULL_LOW (MFPR_LPM_DRIVE_LOW | MFPR_SLEEP_OE_N) -#define MFPR_LPM_PULL_HIGH (MFPR_LPM_DRIVE_HIGH | MFPR_SLEEP_OE_N) -#define MFPR_LPM_FLOAT (MFPR_SLEEP_OE_N) -#define MFPR_LPM_MASK (0xe080) - -/* - * The pullup and pulldown state of the MFP pin at run mode is by default - * determined by the selected alternate function. In case that some buggy - * devices need to override this default behavior, the definitions below - * indicates the setting of corresponding MFPR bits - * - * Definition pull_sel pullup_en pulldown_en - * MFPR_PULL_NONE 0 0 0 - * MFPR_PULL_LOW 1 0 1 - * MFPR_PULL_HIGH 1 1 0 - * MFPR_PULL_BOTH 1 1 1 - * MFPR_PULL_FLOAT 1 0 0 - */ -#define MFPR_PULL_NONE (0) -#define MFPR_PULL_LOW (MFPR_PULL_SEL | MFPR_PULLDOWN_EN) -#define MFPR_PULL_BOTH (MFPR_PULL_LOW | MFPR_PULLUP_EN) -#define MFPR_PULL_HIGH (MFPR_PULL_SEL | MFPR_PULLUP_EN) -#define MFPR_PULL_FLOAT (MFPR_PULL_SEL) - -/* mfp_spin_lock is used to ensure that MFP register configuration - * (most likely a read-modify-write operation) is atomic, and that - * mfp_table[] is consistent - */ -static DEFINE_SPINLOCK(mfp_spin_lock); - -static void __iomem *mfpr_mmio_base; - -struct mfp_pin { - unsigned long config; /* -1 for not configured */ - unsigned long mfpr_off; /* MFPRxx Register offset */ - unsigned long mfpr_run; /* Run-Mode Register Value */ - unsigned long mfpr_lpm; /* Low Power Mode Register Value */ -}; - -static struct mfp_pin mfp_table[MFP_PIN_MAX]; - -/* mapping of MFP_LPM_* definitions to MFPR_LPM_* register bits */ -static const unsigned long mfpr_lpm[] = { - MFPR_LPM_INPUT, - MFPR_LPM_DRIVE_LOW, - MFPR_LPM_DRIVE_HIGH, - MFPR_LPM_PULL_LOW, - MFPR_LPM_PULL_HIGH, - MFPR_LPM_FLOAT, - MFPR_LPM_INPUT, -}; - -/* mapping of MFP_PULL_* definitions to MFPR_PULL_* register bits */ -static const unsigned long mfpr_pull[] = { - MFPR_PULL_NONE, - MFPR_PULL_LOW, - MFPR_PULL_HIGH, - MFPR_PULL_BOTH, - MFPR_PULL_FLOAT, -}; - -/* mapping of MFP_LPM_EDGE_* definitions to MFPR_EDGE_* register bits */ -static const unsigned long mfpr_edge[] = { - MFPR_EDGE_NONE, - MFPR_EDGE_RISE, - MFPR_EDGE_FALL, - MFPR_EDGE_BOTH, -}; - -#define mfpr_readl(off) \ - __raw_readl(mfpr_mmio_base + (off)) - -#define mfpr_writel(off, val) \ - __raw_writel(val, mfpr_mmio_base + (off)) - -#define mfp_configured(p) ((p)->config != -1) - -/* - * perform a read-back of any valid MFPR register to make sure the - * previous writings are finished - */ -static unsigned long mfpr_off_readback; -#define mfpr_sync() (void)__raw_readl(mfpr_mmio_base + mfpr_off_readback) - -static inline void __mfp_config_run(struct mfp_pin *p) -{ - if (mfp_configured(p)) - mfpr_writel(p->mfpr_off, p->mfpr_run); -} - -static inline void __mfp_config_lpm(struct mfp_pin *p) -{ - if (mfp_configured(p)) { - unsigned long mfpr_clr = (p->mfpr_run & ~MFPR_EDGE_BOTH) | MFPR_EDGE_CLEAR; - if (mfpr_clr != p->mfpr_run) - mfpr_writel(p->mfpr_off, mfpr_clr); - if (p->mfpr_lpm != mfpr_clr) - mfpr_writel(p->mfpr_off, p->mfpr_lpm); - } -} - -void mfp_config(unsigned long *mfp_cfgs, int num) -{ - unsigned long flags; - int i; - - spin_lock_irqsave(&mfp_spin_lock, flags); - - for (i = 0; i < num; i++, mfp_cfgs++) { - unsigned long tmp, c = *mfp_cfgs; - struct mfp_pin *p; - int pin, af, drv, lpm, edge, pull; - - pin = MFP_PIN(c); - BUG_ON(pin >= MFP_PIN_MAX); - p = &mfp_table[pin]; - - af = MFP_AF(c); - drv = MFP_DS(c); - lpm = MFP_LPM_STATE(c); - edge = MFP_LPM_EDGE(c); - pull = MFP_PULL(c); - - /* run-mode pull settings will conflict with MFPR bits of - * low power mode state, calculate mfpr_run and mfpr_lpm - * individually if pull != MFP_PULL_NONE - */ - tmp = MFPR_AF_SEL(af) | MFPR_DRIVE(drv); - - if (likely(pull == MFP_PULL_NONE)) { - p->mfpr_run = tmp | mfpr_lpm[lpm] | mfpr_edge[edge]; - p->mfpr_lpm = p->mfpr_run; - } else { - p->mfpr_lpm = tmp | mfpr_lpm[lpm] | mfpr_edge[edge]; - p->mfpr_run = tmp | mfpr_pull[pull]; - } - - p->config = c; __mfp_config_run(p); - } - - mfpr_sync(); - spin_unlock_irqrestore(&mfp_spin_lock, flags); -} - -unsigned long mfp_read(int mfp) -{ - unsigned long val, flags; - - BUG_ON(mfp < 0 || mfp >= MFP_PIN_MAX); - - spin_lock_irqsave(&mfp_spin_lock, flags); - val = mfpr_readl(mfp_table[mfp].mfpr_off); - spin_unlock_irqrestore(&mfp_spin_lock, flags); - - return val; -} - -void mfp_write(int mfp, unsigned long val) -{ - unsigned long flags; - - BUG_ON(mfp < 0 || mfp >= MFP_PIN_MAX); - - spin_lock_irqsave(&mfp_spin_lock, flags); - mfpr_writel(mfp_table[mfp].mfpr_off, val); - mfpr_sync(); - spin_unlock_irqrestore(&mfp_spin_lock, flags); -} - -void __init mfp_init_base(void __iomem *mfpr_base) -{ - int i; - - /* initialize the table with default - unconfigured */ - for (i = 0; i < ARRAY_SIZE(mfp_table); i++) - mfp_table[i].config = -1; - - mfpr_mmio_base = mfpr_base; -} - -void __init mfp_init_addr(struct mfp_addr_map *map) -{ - struct mfp_addr_map *p; - unsigned long offset, flags; - int i; - - spin_lock_irqsave(&mfp_spin_lock, flags); - - /* mfp offset for readback */ - mfpr_off_readback = map[0].offset; - - for (p = map; p->start != MFP_PIN_INVALID; p++) { - offset = p->offset; - i = p->start; - - do { - mfp_table[i].mfpr_off = offset; - mfp_table[i].mfpr_run = 0; - mfp_table[i].mfpr_lpm = 0; - offset += 4; i++; - } while ((i <= p->end) && (p->end != -1)); - } - - spin_unlock_irqrestore(&mfp_spin_lock, flags); -} - -void mfp_config_lpm(void) -{ - struct mfp_pin *p = &mfp_table[0]; - int pin; - - for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++, p++) - __mfp_config_lpm(p); -} - -void mfp_config_run(void) -{ - struct mfp_pin *p = &mfp_table[0]; - int pin; - - for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++, p++) - __mfp_config_run(p); -} |