linux-yocto - Yocto Linux Embedded kernel

Age	Commit message (Expand)	Author
2019-05-21	treewide: Add SPDX license identifier for more missed files	Thomas Gleixner
2018-06-12	treewide: kmalloc() -> kmalloc_array()	Kees Cook
2018-01-09	mbcache: make sure c_entry_count is not decremented past zero	Jiang Biao
2018-01-07	mbcache: revert "fs/mbcache.c: make count_objects() more robust"	Eric Biggers
2018-01-07	mbcache: initialize entry->e_referenced in mb_cache_entry_create()	Alexander Potapenko
2017-11-29	fs/mbcache.c: make count_objects() more robust	Jiang Biao
2017-06-22	ext4: xattr inode deduplication	Tahsin Erdogan
2017-06-22	mbcache: make mbcache naming more generic	Tahsin Erdogan
2016-12-03	mbcache: document that "find" functions only return reusable entries	Eric Biggers
2016-12-03	mbcache: use consistent type for entry count	Eric Biggers
2016-12-03	mbcache: remove unnecessary module_get/module_put	Eric Biggers
2016-12-03	mbcache: don't BUG() if entry cache cannot be allocated	Eric Biggers
2016-12-03	mbcache: correctly handle 'e_referenced' bit	Eric Biggers
2016-08-31	mbcache: fix to detect failure of register_shrinker	Chao Yu
2016-02-22	mbcache: add reusable flag to cache entries	Andreas Gruenbacher
2016-02-22	mbcache: get rid of _e_hash_list_head	Andreas Gruenbacher
2016-02-22	mbcache2: rename to mbcache	Jan Kara
2016-02-22	mbcache: remove mbcache	Jan Kara
2014-06-25	fs/mbcache: replace __builtin_log2() with ilog2()	T Makphaibulchoke
2014-03-18	ext4: each filesystem creates and uses its own mb_cache	T Makphaibulchoke
2014-03-18	fs/mbcache.c: doucple the locking of local from global data	T Makphaibulchoke
2014-03-18	fs/mbcache.c: change block and index hash chain to hlist_bl_node	T Makphaibulchoke
2013-09-10	fs: convert fs shrinkers to new scan/count API	Dave Chinner
2013-09-10	super: fix calculation of shrinkable objects for small numbers	Glauber Costa
2011-05-25	vmscan: change shrinker API by passing shrink_control struct	Ying Han
2011-03-31	Fix common misspellings	Lucas De Marchi
2011-01-10	ext2: Resolve 'dereferencing pointer to incomplete type' when enabling EXT2_X...	Josh Hunt
2010-08-18	mbcache: Limit the maximum number of cache entries	Andreas Gruenbacher
2010-08-09	mbcache: fix shrinker function return value	Andreas Gruenbacher
2010-08-09	mbcache: Remove unused features	Andreas Gruenbacher
2010-07-19	mm: add context argument to shrinker callback	Dave Chinner
2008-04-15	vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs	Jan Kara
2007-10-25	fs: Fix to correct the mbcache entries counter	Ram Gupta
2007-07-20	mm: Remove slab destructors from kmem_cache_create().	Paul Mundt
2007-07-17	mm: clean up and kernelify shrinker registration	Rusty Russell
2006-12-07	[PATCH] slab: remove kmem_cache_t	Christoph Lameter
2006-09-29	[PATCH] mbcache: add lock annotation for __mb_cache_entry_release_unlock()	Josh Triplett
2006-03-28	[PATCH] Typo fixes	Alexey Dobriyan
2006-03-24	[PATCH] cpuset memory spread: slab cache filesystems	Paul Jackson
2006-01-14	[PATCH] Unlinline a bunch of other functions	Arjan van de Ven
2005-11-07	[PATCH] kfree cleanup: fs	Jesper Juhl
2005-10-28	[PATCH] gfp_t: fs/*	Al Viro
2005-07-27	[PATCH] mbcache: Remove unused mb_cache_shrink parameter	Andreas Gruenbacher
2005-05-05	[PATCH] make some things static	Adrian Bunk
2005-04-16	Linux-2.6.12-rc2v2.6.12-rc2	Linus Torvalds

// SPDX-License-Identifier: GPL-2.0-only /* * Generic GPIO driver for logic cells found in the Nomadik SoC * * Copyright (C) 2008,2009 STMicroelectronics * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it> * Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com> * Copyright (C) 2011-2013 Linus Walleij <linus.walleij@linaro.org> */ #include <linux/bitops.h> #include <linux/cleanup.h> #include <linux/clk.h> #include <linux/device.h> #include <linux/err.h> #include <linux/gpio/driver.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/property.h> #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/spinlock.h> /* Since we request GPIOs from ourself */ #include <linux/pinctrl/consumer.h> #include <linux/pinctrl/machine.h> #include <linux/pinctrl/pinconf.h> #include <linux/pinctrl/pinctrl.h> #include <linux/pinctrl/pinmux.h> #include "../core.h" #include "../pinctrl-utils.h" #include "pinctrl-nomadik.h" /* * The GPIO module in the Nomadik family of Systems-on-Chip is an * AMBA device, managing 32 pins and alternate functions. The logic block * is currently used in the Nomadik and ux500. * * Symbols in this file are called "nmk_gpio" for "nomadik gpio" */ /* * pin configurations are represented by 32-bit integers: * * bit 0.. 8 - Pin Number (512 Pins Maximum) * bit 9..10 - Alternate Function Selection * bit 11..12 - Pull up/down state * bit 13 - Sleep mode behaviour * bit 14 - Direction * bit 15 - Value (if output) * bit 16..18 - SLPM pull up/down state * bit 19..20 - SLPM direction * bit 21..22 - SLPM Value (if output) * bit 23..25 - PDIS value (if input) * bit 26 - Gpio mode * bit 27 - Sleep mode * * to facilitate the definition, the following macros are provided * * PIN_CFG_DEFAULT - default config (0): * pull up/down = disabled * sleep mode = input/wakeup * direction = input * value = low * SLPM direction = same as normal * SLPM pull = same as normal * SLPM value = same as normal * * PIN_CFG - default config with alternate function */ typedef unsigned long pin_cfg_t; #define PIN_NUM_MASK 0x1ff #define PIN_NUM(x) ((x) & PIN_NUM_MASK) #define PIN_ALT_SHIFT 9 #define PIN_ALT_MASK (0x3 << PIN_ALT_SHIFT) #define PIN_ALT(x) (((x) & PIN_ALT_MASK) >> PIN_ALT_SHIFT) #define PIN_GPIO (NMK_GPIO_ALT_GPIO << PIN_ALT_SHIFT) #define PIN_ALT_A (NMK_GPIO_ALT_A << PIN_ALT_SHIFT) #define PIN_ALT_B (NMK_GPIO_ALT_B << PIN_ALT_SHIFT) #define PIN_ALT_C (NMK_GPIO_ALT_C << PIN_ALT_SHIFT) #define PIN_PULL_SHIFT 11 #define PIN_PULL_MASK (0x3 << PIN_PULL_SHIFT) #define PIN_PULL(x) (((x) & PIN_PULL_MASK) >> PIN_PULL_SHIFT) #define PIN_PULL_NONE (NMK_GPIO_PULL_NONE << PIN_PULL_SHIFT) #define PIN_PULL_UP (NMK_GPIO_PULL_UP << PIN_PULL_SHIFT) #define PIN_PULL_DOWN (NMK_GPIO_PULL_DOWN << PIN_PULL_SHIFT) #define PIN_SLPM_SHIFT 13 #define PIN_SLPM_MASK (0x1 << PIN_SLPM_SHIFT) #define PIN_SLPM(x) (((x) & PIN_SLPM_MASK) >> PIN_SLPM_SHIFT) #define PIN_SLPM_MAKE_INPUT (NMK_GPIO_SLPM_INPUT << PIN_SLPM_SHIFT) #define PIN_SLPM_NOCHANGE (NMK_GPIO_SLPM_NOCHANGE << PIN_SLPM_SHIFT) /* These two replace the above in DB8500v2+ */ #define PIN_SLPM_WAKEUP_ENABLE (NMK_GPIO_SLPM_WAKEUP_ENABLE << PIN_SLPM_SHIFT) #define PIN_SLPM_WAKEUP_DISABLE (NMK_GPIO_SLPM_WAKEUP_DISABLE << PIN_SLPM_SHIFT) #define PIN_SLPM_USE_MUX_SETTINGS_IN_SLEEP PIN_SLPM_WAKEUP_DISABLE #define PIN_SLPM_GPIO PIN_SLPM_WAKEUP_ENABLE /* In SLPM, pin is a gpio */ #define PIN_SLPM_ALTFUNC PIN_SLPM_WAKEUP_DISABLE /* In SLPM, pin is altfunc */ #define PIN_DIR_SHIFT 14 #define PIN_DIR_MASK (0x1 << PIN_DIR_SHIFT) #define PIN_DIR(x) (((x) & PIN_DIR_MASK) >> PIN_DIR_SHIFT) #define PIN_DIR_INPUT (0 << PIN_DIR_SHIFT) #define PIN_DIR_OUTPUT (1 << PIN_DIR_SHIFT) #define PIN_VAL_SHIFT 15 #define PIN_VAL_MASK (0x1 << PIN_VAL_SHIFT) #define PIN_VAL(x) (((x) & PIN_VAL_MASK) >> PIN_VAL_SHIFT) #define PIN_VAL_LOW (0 << PIN_VAL_SHIFT) #define PIN_VAL_HIGH (1 << PIN_VAL_SHIFT) #define PIN_SLPM_PULL_SHIFT 16 #define PIN_SLPM_PULL_MASK (0x7 << PIN_SLPM_PULL_SHIFT) #define PIN_SLPM_PULL(x) \ (((x) & PIN_SLPM_PULL_MASK) >> PIN_SLPM_PULL_SHIFT) #define PIN_SLPM_PULL_NONE \ ((1 + NMK_GPIO_PULL_NONE) << PIN_SLPM_PULL_SHIFT) #define PIN_SLPM_PULL_UP \ ((1 + NMK_GPIO_PULL_UP) << PIN_SLPM_PULL_SHIFT) #define PIN_SLPM_PULL_DOWN \ ((1 + NMK_GPIO_PULL_DOWN) << PIN_SLPM_PULL_SHIFT) #define PIN_SLPM_DIR_SHIFT 19 #define PIN_SLPM_DIR_MASK (0x3 << PIN_SLPM_DIR_SHIFT) #define PIN_SLPM_DIR(x) \ (((x) & PIN_SLPM_DIR_MASK) >> PIN_SLPM_DIR_SHIFT) #define PIN_SLPM_DIR_INPUT ((1 + 0) << PIN_SLPM_DIR_SHIFT) #define PIN_SLPM_DIR_OUTPUT ((1 + 1) << PIN_SLPM_DIR_SHIFT) #define PIN_SLPM_VAL_SHIFT 21 #define PIN_SLPM_VAL_MASK (0x3 << PIN_SLPM_VAL_SHIFT) #define PIN_SLPM_VAL(x) \ (((x) & PIN_SLPM_VAL_MASK) >> PIN_SLPM_VAL_SHIFT) #define PIN_SLPM_VAL_LOW ((1 + 0) << PIN_SLPM_VAL_SHIFT) #define PIN_SLPM_VAL_HIGH ((1 + 1) << PIN_SLPM_VAL_SHIFT) #define PIN_SLPM_PDIS_SHIFT 23 #define PIN_SLPM_PDIS_MASK (0x3 << PIN_SLPM_PDIS_SHIFT) #define PIN_SLPM_PDIS(x) \ (((x) & PIN_SLPM_PDIS_MASK) >> PIN_SLPM_PDIS_SHIFT) #define PIN_SLPM_PDIS_NO_CHANGE (0 << PIN_SLPM_PDIS_SHIFT) #define PIN_SLPM_PDIS_DISABLED (1 << PIN_SLPM_PDIS_SHIFT) #define PIN_SLPM_PDIS_ENABLED (2 << PIN_SLPM_PDIS_SHIFT) #define PIN_LOWEMI_SHIFT 25 #define PIN_LOWEMI_MASK (0x1 << PIN_LOWEMI_SHIFT) #define PIN_LOWEMI(x) (((x) & PIN_LOWEMI_MASK) >> PIN_LOWEMI_SHIFT) #define PIN_LOWEMI_DISABLED (0 << PIN_LOWEMI_SHIFT) #define PIN_LOWEMI_ENABLED (1 << PIN_LOWEMI_SHIFT) #define PIN_GPIOMODE_SHIFT 26 #define PIN_GPIOMODE_MASK (0x1 << PIN_GPIOMODE_SHIFT) #define PIN_GPIOMODE(x) (((x) & PIN_GPIOMODE_MASK) >> PIN_GPIOMODE_SHIFT) #define PIN_GPIOMODE_DISABLED (0 << PIN_GPIOMODE_SHIFT) #define PIN_GPIOMODE_ENABLED (1 << PIN_GPIOMODE_SHIFT) #define PIN_SLEEPMODE_SHIFT 27 #define PIN_SLEEPMODE_MASK (0x1 << PIN_SLEEPMODE_SHIFT) #define PIN_SLEEPMODE(x) (((x) & PIN_SLEEPMODE_MASK) >> PIN_SLEEPMODE_SHIFT) #define PIN_SLEEPMODE_DISABLED (0 << PIN_SLEEPMODE_SHIFT) #define PIN_SLEEPMODE_ENABLED (1 << PIN_SLEEPMODE_SHIFT) /* Shortcuts. Use these instead of separate DIR, PULL, and VAL. */ #define PIN_INPUT_PULLDOWN (PIN_DIR_INPUT | PIN_PULL_DOWN) #define PIN_INPUT_PULLUP (PIN_DIR_INPUT | PIN_PULL_UP) #define PIN_INPUT_NOPULL (PIN_DIR_INPUT | PIN_PULL_NONE) #define PIN_OUTPUT_LOW (PIN_DIR_OUTPUT | PIN_VAL_LOW) #define PIN_OUTPUT_HIGH (PIN_DIR_OUTPUT | PIN_VAL_HIGH) #define PIN_SLPM_INPUT_PULLDOWN (PIN_SLPM_DIR_INPUT | PIN_SLPM_PULL_DOWN) #define PIN_SLPM_INPUT_PULLUP (PIN_SLPM_DIR_INPUT | PIN_SLPM_PULL_UP) #define PIN_SLPM_INPUT_NOPULL (PIN_SLPM_DIR_INPUT | PIN_SLPM_PULL_NONE) #define PIN_SLPM_OUTPUT_LOW (PIN_SLPM_DIR_OUTPUT | PIN_SLPM_VAL_LOW) #define PIN_SLPM_OUTPUT_HIGH (PIN_SLPM_DIR_OUTPUT | PIN_SLPM_VAL_HIGH) #define PIN_CFG_DEFAULT (0) #define PIN_CFG(num, alt) \ (PIN_CFG_DEFAULT |\ (PIN_NUM(num) | PIN_##alt)) #define PIN_CFG_INPUT(num, alt, pull) \ (PIN_CFG_DEFAULT |\ (PIN_NUM(num) | PIN_##alt | PIN_INPUT_##pull)) #define PIN_CFG_OUTPUT(num, alt, val) \ (PIN_CFG_DEFAULT |\ (PIN_NUM(num) | PIN_##alt | PIN_OUTPUT_##val)) /* * "nmk_gpio" and "NMK_GPIO" stand for "Nomadik GPIO", leaving * the "gpio" namespace for generic and cross-machine functions */ #define GPIO_BLOCK_SHIFT 5 #define NMK_GPIO_PER_CHIP (1 << GPIO_BLOCK_SHIFT) #define NMK_MAX_BANKS DIV_ROUND_UP(512, NMK_GPIO_PER_CHIP) /* Register in the logic block */ #define NMK_GPIO_DAT 0x00 #define NMK_GPIO_DATS 0x04 #define NMK_GPIO_DATC 0x08 #define NMK_GPIO_PDIS 0x0c #define NMK_GPIO_DIR 0x10 #define NMK_GPIO_DIRS 0x14 #define NMK_GPIO_DIRC 0x18 #define NMK_GPIO_SLPC 0x1c #define NMK_GPIO_AFSLA 0x20 #define NMK_GPIO_AFSLB 0x24 #define NMK_GPIO_LOWEMI 0x28 #define NMK_GPIO_RIMSC 0x40 #define NMK_GPIO_FIMSC 0x44 #define NMK_GPIO_IS 0x48 #define NMK_GPIO_IC 0x4c #define NMK_GPIO_RWIMSC 0x50 #define NMK_GPIO_FWIMSC 0x54 #define NMK_GPIO_WKS 0x58 /* These appear in DB8540 and later ASICs */ #define NMK_GPIO_EDGELEVEL 0x5C #define NMK_GPIO_LEVEL 0x60 /* Pull up/down values */ enum nmk_gpio_pull { NMK_GPIO_PULL_NONE, NMK_GPIO_PULL_UP, NMK_GPIO_PULL_DOWN, }; /* Sleep mode */ enum nmk_gpio_slpm { NMK_GPIO_SLPM_INPUT, NMK_GPIO_SLPM_WAKEUP_ENABLE = NMK_GPIO_SLPM_INPUT, NMK_GPIO_SLPM_NOCHANGE, NMK_GPIO_SLPM_WAKEUP_DISABLE = NMK_GPIO_SLPM_NOCHANGE, }; struct nmk_gpio_chip { struct gpio_chip chip; void __iomem *addr; struct clk *clk; unsigned int bank; void (*set_ioforce)(bool enable); spinlock_t lock; bool sleepmode; /* Keep track of configured edges */ u32 edge_rising; u32 edge_falling; u32 real_wake; u32 rwimsc; u32 fwimsc; u32 rimsc; u32 fimsc; u32 pull_up; u32 lowemi; }; /** * struct nmk_pinctrl - state container for the Nomadik pin controller * @dev: containing device pointer * @pctl: corresponding pin controller device * @soc: SoC data for this specific chip * @prcm_base: PRCM register range virtual base */ struct nmk_pinctrl { struct device *dev; struct pinctrl_dev *pctl; const struct nmk_pinctrl_soc_data *soc; void __iomem *prcm_base; }; static struct nmk_gpio_chip *nmk_gpio_chips[NMK_MAX_BANKS]; static DEFINE_SPINLOCK(nmk_gpio_slpm_lock); #define NUM_BANKS ARRAY_SIZE(nmk_gpio_chips) static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip, unsigned offset, int gpio_mode) { u32 afunc, bfunc; afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~BIT(offset); bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~BIT(offset); if (gpio_mode & NMK_GPIO_ALT_A) afunc |= BIT(offset); if (gpio_mode & NMK_GPIO_ALT_B) bfunc |= BIT(offset); writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA); writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB); } static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip, unsigned offset, enum nmk_gpio_slpm mode) { u32 slpm; slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC); if (mode == NMK_GPIO_SLPM_NOCHANGE) slpm |= BIT(offset); else slpm &= ~BIT(offset); writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC); } static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip, unsigned offset, enum nmk_gpio_pull pull) { u32 pdis; pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS); if (pull == NMK_GPIO_PULL_NONE) { pdis |= BIT(offset); nmk_chip->pull_up &= ~BIT(offset); } else { pdis &= ~BIT(offset); } writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS); if (pull == NMK_GPIO_PULL_UP) { nmk_chip->pull_up |= BIT(offset); writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DATS); } else if (pull == NMK_GPIO_PULL_DOWN) { nmk_chip->pull_up &= ~BIT(offset); writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DATC); } } static void __nmk_gpio_set_lowemi(struct nmk_gpio_chip *nmk_chip, unsigned offset, bool lowemi) { bool enabled = nmk_chip->lowemi & BIT(offset); if (lowemi == enabled) return; if (lowemi) nmk_chip->lowemi |= BIT(offset); else nmk_chip->lowemi &= ~BIT(offset); writel_relaxed(nmk_chip->lowemi, nmk_chip->addr + NMK_GPIO_LOWEMI); } static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip, unsigned offset) { writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DIRC); } static void __nmk_gpio_set_output(struct nmk_gpio_chip *nmk_chip, unsigned offset, int val) { if (val) writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DATS); else writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DATC); } static void __nmk_gpio_make_output(struct nmk_gpio_chip *nmk_chip, unsigned offset, int val) { writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DIRS); __nmk_gpio_set_output(nmk_chip, offset, val); } static void __nmk_gpio_set_mode_safe(struct nmk_gpio_chip *nmk_chip, unsigned offset, int gpio_mode, bool glitch) { u32 rwimsc = nmk_chip->rwimsc; u32 fwimsc = nmk_chip->fwimsc; if (glitch && nmk_chip->set_ioforce) { u32 bit = BIT(offset); /* Prevent spurious wakeups */ writel(rwimsc & ~bit, nmk_chip->addr + NMK_GPIO_RWIMSC); writel(fwimsc & ~bit, nmk_chip->addr + NMK_GPIO_FWIMSC); nmk_chip->set_ioforce(true); } __nmk_gpio_set_mode(nmk_chip, offset, gpio_mode); if (glitch && nmk_chip->set_ioforce) { nmk_chip->set_ioforce(false); writel(rwimsc, nmk_chip->addr + NMK_GPIO_RWIMSC); writel(fwimsc, nmk_chip->addr + NMK_GPIO_FWIMSC); } } static void nmk_gpio_disable_lazy_irq(struct nmk_gpio_chip *nmk_chip, unsigned offset) { u32 falling = nmk_chip->fimsc & BIT(offset); u32 rising = nmk_chip->rimsc & BIT(offset); int gpio = nmk_chip->chip.base + offset; int irq = irq_find_mapping(nmk_chip->chip.irq.domain, offset); struct irq_data *d = irq_get_irq_data(irq); if (!rising && !falling) return; if (!d || !irqd_irq_disabled(d)) return; if (rising) { nmk_chip->rimsc &= ~BIT(offset); writel_relaxed(nmk_chip->rimsc, nmk_chip->addr + NMK_GPIO_RIMSC); } if (falling) { nmk_chip->fimsc &= ~BIT(offset); writel_relaxed(nmk_chip->fimsc, nmk_chip->addr + NMK_GPIO_FIMSC); } dev_dbg(nmk_chip->chip.parent, "%d: clearing interrupt mask\n", gpio); } static void nmk_write_masked(void __iomem *reg, u32 mask, u32 value) { u32 val; val = readl(reg); val = ((val & ~mask) | (value & mask)); writel(val, reg); } static void nmk_prcm_altcx_set_mode(struct nmk_pinctrl *npct, unsigned offset, unsigned alt_num) { int i; u16 reg; u8 bit; u8 alt_index; const struct prcm_gpiocr_altcx_pin_desc *pin_desc; const u16 *gpiocr_regs; if (!npct->prcm_base) return; if (alt_num > PRCM_IDX_GPIOCR_ALTC_MAX) { dev_err(npct->dev, "PRCM GPIOCR: alternate-C%i is invalid\n", alt_num); return; } for (i = 0 ; i < npct->soc->npins_altcx ; i++) { if (npct->soc->altcx_pins[i].pin == offset) break; } if (i == npct->soc->npins_altcx) { dev_dbg(npct->dev, "PRCM GPIOCR: pin %i is not found\n", offset); return; } pin_desc = npct->soc->altcx_pins + i; gpiocr_regs = npct->soc->prcm_gpiocr_registers; /* * If alt_num is NULL, just clear current ALTCx selection * to make sure we come back to a pure ALTC selection */ if (!alt_num) { for (i = 0 ; i < PRCM_IDX_GPIOCR_ALTC_MAX ; i++) { if (pin_desc->altcx[i].used == true) { reg = gpiocr_regs[pin_desc->altcx[i].reg_index]; bit = pin_desc->altcx[i].control_bit; if (readl(npct->prcm_base + reg) & BIT(bit)) { nmk_write_masked(npct->prcm_base + reg, BIT(bit), 0); dev_dbg(npct->dev, "PRCM GPIOCR: pin %i: alternate-C%i has been disabled\n", offset, i+1); } } } return; } alt_index = alt_num - 1; if (pin_desc->altcx[alt_index].used == false) { dev_warn(npct->dev, "PRCM GPIOCR: pin %i: alternate-C%i does not exist\n", offset, alt_num); return; } /* * Check if any other ALTCx functions are activated on this pin * and disable it first. */ for (i = 0 ; i < PRCM_IDX_GPIOCR_ALTC_MAX ; i++) { if (i == alt_index) continue; if (pin_desc->altcx[i].used == true) { reg = gpiocr_regs[pin_desc->altcx[i].reg_index]; bit = pin_desc->altcx[i].control_bit; if (readl(npct->prcm_base + reg) & BIT(bit)) { nmk_write_masked(npct->prcm_base + reg, BIT(bit), 0); dev_dbg(npct->dev, "PRCM GPIOCR: pin %i: alternate-C%i has been disabled\n", offset, i+1); } } } reg = gpiocr_regs[pin_desc->altcx[alt_index].reg_index]; bit = pin_desc->altcx[alt_index].control_bit; dev_dbg(npct->dev, "PRCM GPIOCR: pin %i: alternate-C%i has been selected\n", offset, alt_index+1); nmk_write_masked(npct->prcm_base + reg, BIT(bit), BIT(bit)); } /* * Safe sequence used to switch IOs between GPIO and Alternate-C mode: * - Save SLPM registers * - Set SLPM=0 for the IOs you want to switch and others to 1 * - Configure the GPIO registers for the IOs that are being switched * - Set IOFORCE=1 * - Modify the AFLSA/B registers for the IOs that are being switched * - Set IOFORCE=0 * - Restore SLPM registers * - Any spurious wake up event during switch sequence to be ignored and * cleared */ static void nmk_gpio_glitch_slpm_init(unsigned int *slpm) { int i; for (i = 0; i < NUM_BANKS; i++) { struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; unsigned int temp = slpm[i]; if (!chip) break; clk_enable(chip->clk); slpm[i] = readl(chip->addr + NMK_GPIO_SLPC); writel(temp, chip->addr + NMK_GPIO_SLPC); } } static void nmk_gpio_glitch_slpm_restore(unsigned int *slpm) { int i; for (i = 0; i < NUM_BANKS; i++) { struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; if (!chip) break; writel(slpm[i], chip->addr + NMK_GPIO_SLPC); clk_disable(chip->clk); } } static int __maybe_unused nmk_prcm_gpiocr_get_mode(struct pinctrl_dev *pctldev, int gpio) { int i; u16 reg; u8 bit; struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); const struct prcm_gpiocr_altcx_pin_desc *pin_desc; const u16 *gpiocr_regs; if (!npct->prcm_base) return NMK_GPIO_ALT_C; for (i = 0; i < npct->soc->npins_altcx; i++) { if (npct->soc->altcx_pins[i].pin == gpio) break; } if (i == npct->soc->npins_altcx) return NMK_GPIO_ALT_C; pin_desc = npct->soc->altcx_pins + i; gpiocr_regs = npct->soc->prcm_gpiocr_registers; for (i = 0; i < PRCM_IDX_GPIOCR_ALTC_MAX; i++) { if (pin_desc->altcx[i].used == true) { reg = gpiocr_regs[pin_desc->altcx[i].reg_index]; bit = pin_desc->altcx[i].control_bit; if (readl(npct->prcm_base + reg) & BIT(bit)) return NMK_GPIO_ALT_C+i+1; } } return NMK_GPIO_ALT_C; } /* IRQ functions */ static void nmk_gpio_irq_ack(struct irq_data *d) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(gc); clk_enable(nmk_chip->clk); writel(BIT(d->hwirq), nmk_chip->addr + NMK_GPIO_IC); clk_disable(nmk_chip->clk); } enum nmk_gpio_irq_type { NORMAL, WAKE, }; static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip, int offset, enum nmk_gpio_irq_type which, bool enable) { u32 *rimscval; u32 *fimscval; u32 rimscreg; u32 fimscreg; if (which == NORMAL) { rimscreg = NMK_GPIO_RIMSC; fimscreg = NMK_GPIO_FIMSC; rimscval = &nmk_chip->rimsc; fimscval = &nmk_chip->fimsc; } else { rimscreg = NMK_GPIO_RWIMSC; fimscreg = NMK_GPIO_FWIMSC; rimscval = &nmk_chip->rwimsc; fimscval = &nmk_chip->fwimsc; } /* we must individually set/clear the two edges */ if (nmk_chip->edge_rising & BIT(offset)) { if (enable) *rimscval |= BIT(offset); else *rimscval &= ~BIT(offset); writel(*rimscval, nmk_chip->addr + rimscreg); } if (nmk_chip->edge_falling & BIT(offset)) { if (enable) *fimscval |= BIT(offset); else *fimscval &= ~BIT(offset); writel(*fimscval, nmk_chip->addr + fimscreg); } } static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip, int offset, bool on) { /* * Ensure WAKEUP_ENABLE is on. No need to disable it if wakeup is * disabled, since setting SLPM to 1 increases power consumption, and * wakeup is anyhow controlled by the RIMSC and FIMSC registers. */ if (nmk_chip->sleepmode && on) { __nmk_gpio_set_slpm(nmk_chip, offset, NMK_GPIO_SLPM_WAKEUP_ENABLE); } __nmk_gpio_irq_modify(nmk_chip, offset, WAKE, on); } static void nmk_gpio_irq_maskunmask(struct nmk_gpio_chip *nmk_chip, struct irq_data *d, bool enable) { unsigned long flags; clk_enable(nmk_chip->clk); spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); spin_lock(&nmk_chip->lock); __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, enable); if (!(nmk_chip->real_wake & BIT(d->hwirq))) __nmk_gpio_set_wake(nmk_chip, d->hwirq, enable); spin_unlock(&nmk_chip->lock); spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); clk_disable(nmk_chip->clk); } static void nmk_gpio_irq_mask(struct irq_data *d) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(gc); nmk_gpio_irq_maskunmask(nmk_chip, d, false); gpiochip_disable_irq(gc, irqd_to_hwirq(d)); } static void nmk_gpio_irq_unmask(struct irq_data *d) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(gc); gpiochip_enable_irq(gc, irqd_to_hwirq(d)); nmk_gpio_irq_maskunmask(nmk_chip, d, true); } static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(gc); unsigned long flags; clk_enable(nmk_chip->clk); spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); spin_lock(&nmk_chip->lock); if (irqd_irq_disabled(d)) __nmk_gpio_set_wake(nmk_chip, d->hwirq, on); if (on) nmk_chip->real_wake |= BIT(d->hwirq); else nmk_chip->real_wake &= ~BIT(d->hwirq); spin_unlock(&nmk_chip->lock); spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); clk_disable(nmk_chip->clk); return 0; } static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(gc); bool enabled = !irqd_irq_disabled(d); bool wake = irqd_is_wakeup_set(d); unsigned long flags; if (type & IRQ_TYPE_LEVEL_HIGH) return -EINVAL; if (type & IRQ_TYPE_LEVEL_LOW) return -EINVAL; clk_enable(nmk_chip->clk); spin_lock_irqsave(&nmk_chip->lock, flags); if (enabled) __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, false); if (enabled || wake) __nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, false); nmk_chip->edge_rising &= ~BIT(d->hwirq); if (type & IRQ_TYPE_EDGE_RISING) nmk_chip->edge_rising |= BIT(d->hwirq); nmk_chip->edge_falling &= ~BIT(d->hwirq); if (type & IRQ_TYPE_EDGE_FALLING) nmk_chip->edge_falling |= BIT(d->hwirq); if (enabled) __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, true); if (enabled || wake) __nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, true); spin_unlock_irqrestore(&nmk_chip->lock, flags); clk_disable(nmk_chip->clk); return 0; } static unsigned int nmk_gpio_irq_startup(struct irq_data *d) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(gc); clk_enable(nmk_chip->clk); nmk_gpio_irq_unmask(d); return 0; } static void nmk_gpio_irq_shutdown(struct irq_data *d) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(gc); nmk_gpio_irq_mask(d); clk_disable(nmk_chip->clk); } static void nmk_gpio_irq_handler(struct irq_desc *desc) { struct irq_chip *host_chip = irq_desc_get_chip(desc); struct gpio_chip *chip = irq_desc_get_handler_data(desc); struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip); u32 status; chained_irq_enter(host_chip, desc); clk_enable(nmk_chip->clk); status = readl(nmk_chip->addr + NMK_GPIO_IS); clk_disable(nmk_chip->clk); while (status) { int bit = __ffs(status); generic_handle_domain_irq(chip->irq.domain, bit); status &= ~BIT(bit); } chained_irq_exit(host_chip, desc); } /* I/O Functions */ static int nmk_gpio_get_dir(struct gpio_chip *chip, unsigned offset) { struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip); int dir; clk_enable(nmk_chip->clk); dir = readl(nmk_chip->addr + NMK_GPIO_DIR) & BIT(offset); clk_disable(nmk_chip->clk); if (dir) return GPIO_LINE_DIRECTION_OUT; return GPIO_LINE_DIRECTION_IN; } static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset) { struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip); clk_enable(nmk_chip->clk); writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DIRC); clk_disable(nmk_chip->clk); return 0; } static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset) { struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip); int value; clk_enable(nmk_chip->clk); value = !!(readl(nmk_chip->addr + NMK_GPIO_DAT) & BIT(offset)); clk_disable(nmk_chip->clk); return value; } static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset, int val) { struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip); clk_enable(nmk_chip->clk); __nmk_gpio_set_output(nmk_chip, offset, val); clk_disable(nmk_chip->clk); } static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset, int val) { struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip); clk_enable(nmk_chip->clk); __nmk_gpio_make_output(nmk_chip, offset, val); clk_disable(nmk_chip->clk); return 0; } #ifdef CONFIG_DEBUG_FS static int nmk_gpio_get_mode(struct nmk_gpio_chip *nmk_chip, int offset) { u32 afunc, bfunc; clk_enable(nmk_chip->clk); afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & BIT(offset); bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & BIT(offset); clk_disable(nmk_chip->clk); return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0); } static void nmk_gpio_dbg_show_one(struct seq_file *s, struct pinctrl_dev *pctldev, struct gpio_chip *chip, unsigned offset, unsigned gpio) { struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip); int mode; bool is_out; bool data_out; bool pull; const char *modes[] = { [NMK_GPIO_ALT_GPIO] = "gpio", [NMK_GPIO_ALT_A] = "altA", [NMK_GPIO_ALT_B] = "altB", [NMK_GPIO_ALT_C] = "altC", [NMK_GPIO_ALT_C+1] = "altC1", [NMK_GPIO_ALT_C+2] = "altC2", [NMK_GPIO_ALT_C+3] = "altC3", [NMK_GPIO_ALT_C+4] = "altC4", }; char *label = gpiochip_dup_line_label(chip, offset); if (IS_ERR(label)) return; clk_enable(nmk_chip->clk); is_out = !!(readl(nmk_chip->addr + NMK_GPIO_DIR) & BIT(offset)); pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & BIT(offset)); data_out = !!(readl(nmk_chip->addr + NMK_GPIO_DAT) & BIT(offset)); mode = nmk_gpio_get_mode(nmk_chip, offset); if ((mode == NMK_GPIO_ALT_C) && pctldev) mode = nmk_prcm_gpiocr_get_mode(pctldev, gpio); if (is_out) { seq_printf(s, " gpio-%-3d (%-20.20s) out %s %s", gpio, label ?: "(none)", data_out ? "hi" : "lo", (mode < 0) ? "unknown" : modes[mode]); } else { int irq = chip->to_irq(chip, offset); const int pullidx = pull ? 1 : 0; int val; static const char * const pulls[] = { "none ", "pull enabled", }; seq_printf(s, " gpio-%-3d (%-20.20s) in %s %s", gpio, label ?: "(none)", pulls[pullidx], (mode < 0) ? "unknown" : modes[mode]); val = nmk_gpio_get_input(chip, offset); seq_printf(s, " VAL %d", val); /* * This races with request_irq(), set_irq_type(), * and set_irq_wake() ... but those are "rare". */ if (irq > 0 && irq_has_action(irq)) { char *trigger; bool wake; if (nmk_chip->edge_rising & BIT(offset)) trigger = "edge-rising"; else if (nmk_chip->edge_falling & BIT(offset)) trigger = "edge-falling"; else trigger = "edge-undefined"; wake = !!(nmk_chip->real_wake & BIT(offset)); seq_printf(s, " irq-%d %s%s", irq, trigger, wake ? " wakeup" : ""); } } clk_disable(nmk_chip->clk); } static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) { unsigned i; unsigned gpio = chip->base; for (i = 0; i < chip->ngpio; i++, gpio++) { nmk_gpio_dbg_show_one(s, NULL, chip, i, gpio); seq_printf(s, "\n"); } } #else static inline void nmk_gpio_dbg_show_one(struct seq_file *s, struct pinctrl_dev *pctldev, struct gpio_chip *chip, unsigned offset, unsigned gpio) { } #define nmk_gpio_dbg_show NULL #endif /* * We will allocate memory for the state container using devm* allocators * binding to the first device reaching this point, it doesn't matter if * it is the pin controller or GPIO driver. However we need to use the right * platform device when looking up resources so pay attention to pdev. */ static struct nmk_gpio_chip *nmk_gpio_populate_chip(struct device_node *np, struct platform_device *pdev) { struct nmk_gpio_chip *nmk_chip; struct platform_device *gpio_pdev; struct gpio_chip *chip; struct resource *res; struct clk *clk; void __iomem *base; u32 id; gpio_pdev = of_find_device_by_node(np); if (!gpio_pdev) { pr_err("populate \"%pOFn\": device not found\n", np); return ERR_PTR(-ENODEV); } if (of_property_read_u32(np, "gpio-bank", &id)) { dev_err(&pdev->dev, "populate: gpio-bank property not found\n"); platform_device_put(gpio_pdev); return ERR_PTR(-EINVAL); } /* Already populated? */ nmk_chip = nmk_gpio_chips[id]; if (nmk_chip) { platform_device_put(gpio_pdev); return nmk_chip; } nmk_chip = devm_kzalloc(&pdev->dev, sizeof(*nmk_chip), GFP_KERNEL); if (!nmk_chip) { platform_device_put(gpio_pdev); return ERR_PTR(-ENOMEM); } nmk_chip->bank = id; chip = &nmk_chip->chip; chip->base = id * NMK_GPIO_PER_CHIP; chip->ngpio = NMK_GPIO_PER_CHIP; chip->label = dev_name(&gpio_pdev->dev); chip->parent = &gpio_pdev->dev; res = platform_get_resource(gpio_pdev, IORESOURCE_MEM, 0); base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(base)) { platform_device_put(gpio_pdev); return ERR_CAST(base); } nmk_chip->addr = base; clk = clk_get(&gpio_pdev->dev, NULL); if (IS_ERR(clk)) { platform_device_put(gpio_pdev); return (void *) clk; } clk_prepare(clk); nmk_chip->clk = clk; BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips)); nmk_gpio_chips[id] = nmk_chip; return nmk_chip; } static void nmk_gpio_irq_print_chip(struct irq_data *d, struct seq_file *p) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(gc); seq_printf(p, "nmk%u-%u-%u", nmk_chip->bank, gc->base, gc->base + gc->ngpio - 1); } static const struct irq_chip nmk_irq_chip = { .irq_ack = nmk_gpio_irq_ack, .irq_mask = nmk_gpio_irq_mask, .irq_unmask = nmk_gpio_irq_unmask, .irq_set_type = nmk_gpio_irq_set_type, .irq_set_wake = nmk_gpio_irq_set_wake, .irq_startup = nmk_gpio_irq_startup, .irq_shutdown = nmk_gpio_irq_shutdown, .irq_print_chip = nmk_gpio_irq_print_chip, .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE, GPIOCHIP_IRQ_RESOURCE_HELPERS, }; static int nmk_gpio_probe(struct platform_device *dev) { struct device_node *np = dev->dev.of_node; struct nmk_gpio_chip *nmk_chip; struct gpio_chip *chip; struct gpio_irq_chip *girq; bool supports_sleepmode; int irq; int ret; nmk_chip = nmk_gpio_populate_chip(np, dev); if (IS_ERR(nmk_chip)) { dev_err(&dev->dev, "could not populate nmk chip struct\n"); return PTR_ERR(nmk_chip); } supports_sleepmode = of_property_read_bool(np, "st,supports-sleepmode"); /* Correct platform device ID */ dev->id = nmk_chip->bank; irq = platform_get_irq(dev, 0); if (irq < 0) return irq; /* * The virt address in nmk_chip->addr is in the nomadik register space, * so we can simply convert the resource address, without remapping */ nmk_chip->sleepmode = supports_sleepmode; spin_lock_init(&nmk_chip->lock); chip = &nmk_chip->chip; chip->parent = &dev->dev; chip->request = gpiochip_generic_request; chip->free = gpiochip_generic_free; chip->get_direction = nmk_gpio_get_dir; chip->direction_input = nmk_gpio_make_input; chip->get = nmk_gpio_get_input; chip->direction_output = nmk_gpio_make_output; chip->set = nmk_gpio_set_output; chip->dbg_show = nmk_gpio_dbg_show; chip->can_sleep = false; chip->owner = THIS_MODULE; girq = &chip->irq; gpio_irq_chip_set_chip(girq, &nmk_irq_chip); girq->parent_handler = nmk_gpio_irq_handler; girq->num_parents = 1; girq->parents = devm_kcalloc(&dev->dev, 1, sizeof(*girq->parents), GFP_KERNEL); if (!girq->parents) return -ENOMEM; girq->parents[0] = irq; girq->default_type = IRQ_TYPE_NONE; girq->handler = handle_edge_irq; clk_enable(nmk_chip->clk); nmk_chip->lowemi = readl_relaxed(nmk_chip->addr + NMK_GPIO_LOWEMI); clk_disable(nmk_chip->clk); ret = gpiochip_add_data(chip, nmk_chip); if (ret) return ret; platform_set_drvdata(dev, nmk_chip); dev_info(&dev->dev, "chip registered\n"); return 0; } static int nmk_get_groups_cnt(struct pinctrl_dev *pctldev) { struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); return npct->soc->ngroups; } static const char *nmk_get_group_name(struct pinctrl_dev *pctldev, unsigned selector) { struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); return npct->soc->groups[selector].grp.name; } static int nmk_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector, const unsigned **pins, unsigned *npins) { struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); *pins = npct->soc->groups[selector].grp.pins; *npins = npct->soc->groups[selector].grp.npins; return 0; } static struct nmk_gpio_chip *find_nmk_gpio_from_pin(unsigned pin) { int i; struct nmk_gpio_chip *nmk_gpio; for(i = 0; i < NMK_MAX_BANKS; i++) { nmk_gpio = nmk_gpio_chips[i]; if (!nmk_gpio) continue; if (pin >= nmk_gpio->chip.base && pin < nmk_gpio->chip.base + nmk_gpio->chip.ngpio) return nmk_gpio; } return NULL; } static struct gpio_chip *find_gc_from_pin(unsigned pin) { struct nmk_gpio_chip *nmk_gpio = find_nmk_gpio_from_pin(pin); if (nmk_gpio) return &nmk_gpio->chip; return NULL; } static void nmk_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s, unsigned offset) { struct gpio_chip *chip = find_gc_from_pin(offset); if (!chip) { seq_printf(s, "invalid pin offset"); return; } nmk_gpio_dbg_show_one(s, pctldev, chip, offset - chip->base, offset); } static int nmk_dt_add_map_mux(struct pinctrl_map **map, unsigned *reserved_maps, unsigned *num_maps, const char *group, const char *function) { if (*num_maps == *reserved_maps) return -ENOSPC; (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP; (*map)[*num_maps].data.mux.group = group; (*map)[*num_maps].data.mux.function = function; (*num_maps)++; return 0; } static int nmk_dt_add_map_configs(struct pinctrl_map **map, unsigned *reserved_maps, unsigned *num_maps, const char *group, unsigned long *configs, unsigned num_configs) { unsigned long *dup_configs; if (*num_maps == *reserved_maps) return -ENOSPC; dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs), GFP_KERNEL); if (!dup_configs) return -ENOMEM; (*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_PIN; (*map)[*num_maps].data.configs.group_or_pin = group; (*map)[*num_maps].data.configs.configs = dup_configs; (*map)[*num_maps].data.configs.num_configs = num_configs; (*num_maps)++; return 0; } #define NMK_CONFIG_PIN(x, y) { .property = x, .config = y, } #define NMK_CONFIG_PIN_ARRAY(x, y) { .property = x, .choice = y, \ .size = ARRAY_SIZE(y), } static const unsigned long nmk_pin_input_modes[] = { PIN_INPUT_NOPULL, PIN_INPUT_PULLUP, PIN_INPUT_PULLDOWN, }; static const unsigned long nmk_pin_output_modes[] = { PIN_OUTPUT_LOW, PIN_OUTPUT_HIGH, PIN_DIR_OUTPUT, }; static const unsigned long nmk_pin_sleep_modes[] = { PIN_SLEEPMODE_DISABLED, PIN_SLEEPMODE_ENABLED, }; static const unsigned long nmk_pin_sleep_input_modes[] = { PIN_SLPM_INPUT_NOPULL, PIN_SLPM_INPUT_PULLUP, PIN_SLPM_INPUT_PULLDOWN, PIN_SLPM_DIR_INPUT, }; static const unsigned long nmk_pin_sleep_output_modes[] = { PIN_SLPM_OUTPUT_LOW, PIN_SLPM_OUTPUT_HIGH, PIN_SLPM_DIR_OUTPUT, }; static const unsigned long nmk_pin_sleep_wakeup_modes[] = { PIN_SLPM_WAKEUP_DISABLE, PIN_SLPM_WAKEUP_ENABLE, }; static const unsigned long nmk_pin_gpio_modes[] = { PIN_GPIOMODE_DISABLED, PIN_GPIOMODE_ENABLED, }; static const unsigned long nmk_pin_sleep_pdis_modes[] = { PIN_SLPM_PDIS_DISABLED, PIN_SLPM_PDIS_ENABLED, }; struct nmk_cfg_param { const char *property; unsigned long config; const unsigned long *choice; int size; }; static const struct nmk_cfg_param nmk_cfg_params[] = { NMK_CONFIG_PIN_ARRAY("ste,input", nmk_pin_input_modes), NMK_CONFIG_PIN_ARRAY("ste,output", nmk_pin_output_modes), NMK_CONFIG_PIN_ARRAY("ste,sleep", nmk_pin_sleep_modes), NMK_CONFIG_PIN_ARRAY("ste,sleep-input", nmk_pin_sleep_input_modes), NMK_CONFIG_PIN_ARRAY("ste,sleep-output", nmk_pin_sleep_output_modes), NMK_CONFIG_PIN_ARRAY("ste,sleep-wakeup", nmk_pin_sleep_wakeup_modes), NMK_CONFIG_PIN_ARRAY("ste,gpio", nmk_pin_gpio_modes), NMK_CONFIG_PIN_ARRAY("ste,sleep-pull-disable", nmk_pin_sleep_pdis_modes), }; static int nmk_dt_pin_config(int index, int val, unsigned long *config) { if (nmk_cfg_params[index].choice == NULL) *config = nmk_cfg_params[index].config; else { /* test if out of range */ if (val < nmk_cfg_params[index].size) { *config = nmk_cfg_params[index].config | nmk_cfg_params[index].choice[val]; } } return 0; } static const char *nmk_find_pin_name(struct pinctrl_dev *pctldev, const char *pin_name) { int i, pin_number; struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); if (sscanf((char *)pin_name, "GPIO%d", &pin_number) == 1) for (i = 0; i < npct->soc->npins; i++) if (npct->soc->pins[i].number == pin_number) return npct->soc->pins[i].name; return NULL; } static bool nmk_pinctrl_dt_get_config(struct device_node *np, unsigned long *configs) { bool has_config = 0; unsigned long cfg = 0; int i, val, ret; for (i = 0; i < ARRAY_SIZE(nmk_cfg_params); i++) { ret = of_property_read_u32(np, nmk_cfg_params[i].property, &val); if (ret != -EINVAL) { if (nmk_dt_pin_config(i, val, &cfg) == 0) { *configs |= cfg; has_config = 1; } } } return has_config; } static int nmk_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev, struct device_node *np, struct pinctrl_map **map, unsigned *reserved_maps, unsigned *num_maps) { int ret; const char *function = NULL; unsigned long configs = 0; bool has_config = 0; struct property *prop; struct device_node *np_config; ret = of_property_read_string(np, "function", &function); if (ret >= 0) { const char *group; ret = of_property_count_strings(np, "groups"); if (ret < 0) goto exit; ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps, ret); if (ret < 0) goto exit; of_property_for_each_string(np, "groups", prop, group) { ret = nmk_dt_add_map_mux(map, reserved_maps, num_maps, group, function); if (ret < 0) goto exit; } } has_config = nmk_pinctrl_dt_get_config(np, &configs); np_config = of_parse_phandle(np, "ste,config", 0); if (np_config) { has_config |= nmk_pinctrl_dt_get_config(np_config, &configs); of_node_put(np_config); } if (has_config) { const char *gpio_name; const char *pin; ret = of_property_count_strings(np, "pins"); if (ret < 0) goto exit; ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps, ret); if (ret < 0) goto exit; of_property_for_each_string(np, "pins", prop, pin) { gpio_name = nmk_find_pin_name(pctldev, pin); ret = nmk_dt_add_map_configs(map, reserved_maps, num_maps, gpio_name, &configs, 1); if (ret < 0) goto exit; } } exit: return ret; } static int nmk_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev, struct device_node *np_config, struct pinctrl_map **map, unsigned *num_maps) { unsigned reserved_maps; struct device_node *np; int ret; reserved_maps = 0; *map = NULL; *num_maps = 0; for_each_child_of_node(np_config, np) { ret = nmk_pinctrl_dt_subnode_to_map(pctldev, np, map, &reserved_maps, num_maps); if (ret < 0) { pinctrl_utils_free_map(pctldev, *map, *num_maps); of_node_put(np); return ret; } } return 0; } static const struct pinctrl_ops nmk_pinctrl_ops = { .get_groups_count = nmk_get_groups_cnt, .get_group_name = nmk_get_group_name, .get_group_pins = nmk_get_group_pins, .pin_dbg_show = nmk_pin_dbg_show, .dt_node_to_map = nmk_pinctrl_dt_node_to_map, .dt_free_map = pinctrl_utils_free_map, }; static int nmk_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev) { struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); return npct->soc->nfunctions; } static const char *nmk_pmx_get_func_name(struct pinctrl_dev *pctldev, unsigned function) { struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); return npct->soc->functions[function].name; } static int nmk_pmx_get_func_groups(struct pinctrl_dev *pctldev, unsigned function, const char * const **groups, unsigned * const num_groups) { struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); *groups = npct->soc->functions[function].groups; *num_groups = npct->soc->functions[function].ngroups; return 0; } static int nmk_pmx_set(struct pinctrl_dev *pctldev, unsigned function, unsigned group) { struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); const struct nmk_pingroup *g; static unsigned int slpm[NUM_BANKS]; unsigned long flags = 0; bool glitch; int ret = -EINVAL; int i; g = &npct->soc->groups[group]; if (g->altsetting < 0) return -EINVAL; dev_dbg(npct->dev, "enable group %s, %u pins\n", g->grp.name, g->grp.npins); /* * If we're setting altfunc C by setting both AFSLA and AFSLB to 1, * we may pass through an undesired state. In this case we take * some extra care. * * Safe sequence used to switch IOs between GPIO and Alternate-C mode: * - Save SLPM registers (since we have a shadow register in the * nmk_chip we're using that as backup) * - Set SLPM=0 for the IOs you want to switch and others to 1 * - Configure the GPIO registers for the IOs that are being switched * - Set IOFORCE=1 * - Modify the AFLSA/B registers for the IOs that are being switched * - Set IOFORCE=0 * - Restore SLPM registers * - Any spurious wake up event during switch sequence to be ignored * and cleared * * We REALLY need to save ALL slpm registers, because the external * IOFORCE will switch *all* ports to their sleepmode setting to as * to avoid glitches. (Not just one port!) */ glitch = ((g->altsetting & NMK_GPIO_ALT_C) == NMK_GPIO_ALT_C); if (glitch) { spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); /* Initially don't put any pins to sleep when switching */ memset(slpm, 0xff, sizeof(slpm)); /* * Then mask the pins that need to be sleeping now when we're * switching to the ALT C function. */ for (i = 0; i < g->grp.npins; i++) { unsigned int bit = g->grp.pins[i] % NMK_GPIO_PER_CHIP; slpm[g->grp.pins[i] / NMK_GPIO_PER_CHIP] &= ~BIT(bit); } nmk_gpio_glitch_slpm_init(slpm); } for (i = 0; i < g->grp.npins; i++) { struct nmk_gpio_chip *nmk_chip; unsigned bit; nmk_chip = find_nmk_gpio_from_pin(g->grp.pins[i]); if (!nmk_chip) { dev_err(npct->dev, "invalid pin offset %d in group %s at index %d\n", g->grp.pins[i], g->grp.name, i); goto out_glitch; } dev_dbg(npct->dev, "setting pin %d to altsetting %d\n", g->grp.pins[i], g->altsetting); clk_enable(nmk_chip->clk); bit = g->grp.pins[i] % NMK_GPIO_PER_CHIP; /* * If the pin is switching to altfunc, and there was an * interrupt installed on it which has been lazy disabled, * actually mask the interrupt to prevent spurious interrupts * that would occur while the pin is under control of the * peripheral. Only SKE does this. */ nmk_gpio_disable_lazy_irq(nmk_chip, bit); __nmk_gpio_set_mode_safe(nmk_chip, bit, (g->altsetting & NMK_GPIO_ALT_C), glitch); clk_disable(nmk_chip->clk); /* * Call PRCM GPIOCR config function in case ALTC * has been selected: * - If selection is a ALTCx, some bits in PRCM GPIOCR registers * must be set. * - If selection is pure ALTC and previous selection was ALTCx, * then some bits in PRCM GPIOCR registers must be cleared. */ if ((g->altsetting & NMK_GPIO_ALT_C) == NMK_GPIO_ALT_C) nmk_prcm_altcx_set_mode(npct, g->grp.pins[i], g->altsetting >> NMK_GPIO_ALT_CX_SHIFT); } /* When all pins are successfully reconfigured we get here */ ret = 0; out_glitch: if (glitch) { nmk_gpio_glitch_slpm_restore(slpm); spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); } return ret; } static int nmk_gpio_request_enable(struct pinctrl_dev *pctldev, struct pinctrl_gpio_range *range, unsigned offset) { struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); struct nmk_gpio_chip *nmk_chip; struct gpio_chip *chip; unsigned bit; if (!range) { dev_err(npct->dev, "invalid range\n"); return -EINVAL; } if (!range->gc) { dev_err(npct->dev, "missing GPIO chip in range\n"); return -EINVAL; } chip = range->gc; nmk_chip = gpiochip_get_data(chip); dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset); clk_enable(nmk_chip->clk); bit = offset % NMK_GPIO_PER_CHIP; /* There is no glitch when converting any pin to GPIO */ __nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO); clk_disable(nmk_chip->clk); return 0; } static void nmk_gpio_disable_free(struct pinctrl_dev *pctldev, struct pinctrl_gpio_range *range, unsigned offset) { struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset); /* Set the pin to some default state, GPIO is usually default */ } static const struct pinmux_ops nmk_pinmux_ops = { .get_functions_count = nmk_pmx_get_funcs_cnt, .get_function_name = nmk_pmx_get_func_name, .get_function_groups = nmk_pmx_get_func_groups, .set_mux = nmk_pmx_set, .gpio_request_enable = nmk_gpio_request_enable, .gpio_disable_free = nmk_gpio_disable_free, .strict = true, }; static int nmk_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin, unsigned long *config) { /* Not implemented */ return -EINVAL; } static int nmk_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin, unsigned long *configs, unsigned num_configs) { static const char *pullnames[] = { [NMK_GPIO_PULL_NONE] = "none", [NMK_GPIO_PULL_UP] = "up", [NMK_GPIO_PULL_DOWN] = "down", [3] /* illegal */ = "??" }; static const char *slpmnames[] = { [NMK_GPIO_SLPM_INPUT] = "input/wakeup", [NMK_GPIO_SLPM_NOCHANGE] = "no-change/no-wakeup", }; struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); struct nmk_gpio_chip *nmk_chip; unsigned bit; pin_cfg_t cfg; int pull, slpm, output, val, i; bool lowemi, gpiomode, sleep; nmk_chip = find_nmk_gpio_from_pin(pin); if (!nmk_chip) { dev_err(npct->dev, "invalid pin offset %d\n", pin); return -EINVAL; } for (i = 0; i < num_configs; i++) { /* * The pin config contains pin number and altfunction fields, * here we just ignore that part. It's being handled by the * framework and pinmux callback respectively. */ cfg = (pin_cfg_t) configs[i]; pull = PIN_PULL(cfg); slpm = PIN_SLPM(cfg); output = PIN_DIR(cfg); val = PIN_VAL(cfg); lowemi = PIN_LOWEMI(cfg); gpiomode = PIN_GPIOMODE(cfg); sleep = PIN_SLEEPMODE(cfg); if (sleep) { int slpm_pull = PIN_SLPM_PULL(cfg); int slpm_output = PIN_SLPM_DIR(cfg); int slpm_val = PIN_SLPM_VAL(cfg); /* All pins go into GPIO mode at sleep */ gpiomode = true; /* * The SLPM_* values are normal values + 1 to allow zero * to mean "same as normal". */ if (slpm_pull) pull = slpm_pull - 1; if (slpm_output) output = slpm_output - 1; if (slpm_val) val = slpm_val - 1; dev_dbg(nmk_chip->chip.parent, "pin %d: sleep pull %s, dir %s, val %s\n", pin, slpm_pull ? pullnames[pull] : "same", slpm_output ? (output ? "output" : "input") : "same", slpm_val ? (val ? "high" : "low") : "same"); } dev_dbg(nmk_chip->chip.parent, "pin %d [%#lx]: pull %s, slpm %s (%s%s), lowemi %s\n", pin, cfg, pullnames[pull], slpmnames[slpm], output ? "output " : "input", output ? (val ? "high" : "low") : "", lowemi ? "on" : "off"); clk_enable(nmk_chip->clk); bit = pin % NMK_GPIO_PER_CHIP; if (gpiomode) /* No glitch when going to GPIO mode */ __nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO); if (output) __nmk_gpio_make_output(nmk_chip, bit, val); else { __nmk_gpio_make_input(nmk_chip, bit); __nmk_gpio_set_pull(nmk_chip, bit, pull); } /* TODO: isn't this only applicable on output pins? */ __nmk_gpio_set_lowemi(nmk_chip, bit, lowemi); __nmk_gpio_set_slpm(nmk_chip, bit, slpm); clk_disable(nmk_chip->clk); } /* for each config */ return 0; } static const struct pinconf_ops nmk_pinconf_ops = { .pin_config_get = nmk_pin_config_get, .pin_config_set = nmk_pin_config_set, }; static struct pinctrl_desc nmk_pinctrl_desc = { .name = "pinctrl-nomadik", .pctlops = &nmk_pinctrl_ops, .pmxops = &nmk_pinmux_ops, .confops = &nmk_pinconf_ops, .owner = THIS_MODULE, }; static const struct of_device_id nmk_pinctrl_match[] = { { .compatible = "stericsson,stn8815-pinctrl", .data = (void *)PINCTRL_NMK_STN8815, }, { .compatible = "stericsson,db8500-pinctrl", .data = (void *)PINCTRL_NMK_DB8500, }, {}, }; #ifdef CONFIG_PM_SLEEP static int nmk_pinctrl_suspend(struct device *dev) { struct nmk_pinctrl *npct; npct = dev_get_drvdata(dev); if (!npct) return -EINVAL; return pinctrl_force_sleep(npct->pctl); } static int nmk_pinctrl_resume(struct device *dev) { struct nmk_pinctrl *npct; npct = dev_get_drvdata(dev); if (!npct) return -EINVAL; return pinctrl_force_default(npct->pctl); } #endif static int nmk_pinctrl_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct device_node *prcm_np; struct nmk_pinctrl *npct; unsigned int version = 0; int i; npct = devm_kzalloc(&pdev->dev, sizeof(*npct), GFP_KERNEL); if (!npct) return -ENOMEM; version = (unsigned int)device_get_match_data(&pdev->dev); /* Poke in other ASIC variants here */ if (version == PINCTRL_NMK_STN8815) nmk_pinctrl_stn8815_init(&npct->soc); if (version == PINCTRL_NMK_DB8500) nmk_pinctrl_db8500_init(&npct->soc); /* * Since we depend on the GPIO chips to provide clock and register base * for the pin control operations, make sure that we have these * populated before we continue. Follow the phandles to instantiate * them. The GPIO portion of the actual hardware may be probed before * or after this point: it shouldn't matter as the APIs are orthogonal. */ for (i = 0; i < NMK_MAX_BANKS; i++) { struct device_node *gpio_np; struct nmk_gpio_chip *nmk_chip; gpio_np = of_parse_phandle(np, "nomadik-gpio-chips", i); if (gpio_np) { dev_info(&pdev->dev, "populate NMK GPIO %d \"%pOFn\"\n", i, gpio_np); nmk_chip = nmk_gpio_populate_chip(gpio_np, pdev); if (IS_ERR(nmk_chip)) dev_err(&pdev->dev, "could not populate nmk chip struct " "- continue anyway\n"); of_node_put(gpio_np); } } prcm_np = of_parse_phandle(np, "prcm", 0); if (prcm_np) { npct->prcm_base = of_iomap(prcm_np, 0); of_node_put(prcm_np); } if (!npct->prcm_base) { if (version == PINCTRL_NMK_STN8815) { dev_info(&pdev->dev, "No PRCM base, " "assuming no ALT-Cx control is available\n"); } else { dev_err(&pdev->dev, "missing PRCM base address\n"); return -EINVAL; } } nmk_pinctrl_desc.pins = npct->soc->pins; nmk_pinctrl_desc.npins = npct->soc->npins; npct->dev = &pdev->dev; npct->pctl = devm_pinctrl_register(&pdev->dev, &nmk_pinctrl_desc, npct); if (IS_ERR(npct->pctl)) { dev_err(&pdev->dev, "could not register Nomadik pinctrl driver\n"); return PTR_ERR(npct->pctl); } platform_set_drvdata(pdev, npct); dev_info(&pdev->dev, "initialized Nomadik pin control driver\n"); return 0; } static const struct of_device_id nmk_gpio_match[] = { { .compatible = "st,nomadik-gpio", }, {} }; static struct platform_driver nmk_gpio_driver = { .driver = { .name = "gpio", .of_match_table = nmk_gpio_match, }, .probe = nmk_gpio_probe, }; static SIMPLE_DEV_PM_OPS(nmk_pinctrl_pm_ops, nmk_pinctrl_suspend, nmk_pinctrl_resume); static struct platform_driver nmk_pinctrl_driver = { .driver = { .name = "pinctrl-nomadik", .of_match_table = nmk_pinctrl_match, .pm = &nmk_pinctrl_pm_ops, }, .probe = nmk_pinctrl_probe, }; static int __init nmk_gpio_init(void) { return platform_driver_register(&nmk_gpio_driver); } subsys_initcall(nmk_gpio_init); static int __init nmk_pinctrl_init(void) { return platform_driver_register(&nmk_pinctrl_driver); } core_initcall(nmk_pinctrl_init);