| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Eric Miao | 967 | 96.31% | 2 | 28.57% |
| Yu Tang | 17 | 1.69% | 1 | 14.29% |
| Roel Kluin | 8 | 0.80% | 1 | 14.29% |
| Daniel Mack | 7 | 0.70% | 1 | 14.29% |
| Arnd Bergmann | 3 | 0.30% | 1 | 14.29% |
| Thomas Gleixner | 2 | 0.20% | 1 | 14.29% |
| Total | 1004 | 7 |
// 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); }
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