linux/drivers/pinctrl/pinctrl-nomadik.c

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/*
* 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>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
/* Since we request GPIOs from ourself */
#include <linux/pinctrl/consumer.h>
#include "pinctrl-nomadik.h"
#include "core.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)
/* 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;
unsigned int parent_irq;
int latent_parent_irq;
u32 (*get_latent_status)(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[DIV_ROUND_UP(ARCH_NR_GPIOS, NMK_GPIO_PER_CHIP)];
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 bit = 1 << offset;
u32 afunc, bfunc;
afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
if (gpio_mode & NMK_GPIO_ALT_A)
afunc |= bit;
if (gpio_mode & NMK_GPIO_ALT_B)
bfunc |= bit;
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 bit = 1 << offset;
u32 slpm;
slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC);
if (mode == NMK_GPIO_SLPM_NOCHANGE)
slpm |= bit;
else
slpm &= ~bit;
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 bit = 1 << offset;
u32 pdis;
pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS);
if (pull == NMK_GPIO_PULL_NONE) {
pdis |= bit;
nmk_chip->pull_up &= ~bit;
} else {
pdis &= ~bit;
}
writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS);
if (pull == NMK_GPIO_PULL_UP) {
nmk_chip->pull_up |= bit;
writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
} else if (pull == NMK_GPIO_PULL_DOWN) {
nmk_chip->pull_up &= ~bit;
writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
}
}
static void __nmk_gpio_set_lowemi(struct nmk_gpio_chip *nmk_chip,
unsigned offset, bool lowemi)
{
u32 bit = BIT(offset);
bool enabled = nmk_chip->lowemi & bit;
if (lowemi == enabled)
return;
if (lowemi)
nmk_chip->lowemi |= bit;
else
nmk_chip->lowemi &= ~bit;
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(1 << 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(1 << offset, nmk_chip->addr + NMK_GPIO_DATS);
else
writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATC);
}
static void __nmk_gpio_make_output(struct nmk_gpio_chip *nmk_chip,
unsigned offset, int val)
{
writel(1 << 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.irqdomain, 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.dev, "%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;
pinctrl: nomadik: return if prcm_base is NULL This patch adds a check for npct->prcm_base to make sure that the address is not NULL before using it, as the driver was made capable of loading even without a proper memory resource in: f1671bf pinctrl/nomadik: make independent of prcmu driver Also, refuses to probe without prcm_base on anything else than nomadik. This solves the following crash, introduced during the merge window when booting on U8500 with device tree: pinctrl-nomadik pinctrl-db8500: No PRCM base, assume no ALT-Cx control is available Unable to handle kernel NULL pointer dereference at virtual address 00000138 pgd = c0004000 [00000138] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 Not tainted (3.7.0-02892-g1ebaf4f #631) PC is at nmk_pmx_enable+0x1bc/0x4d0 LR is at clk_disable+0x40/0x44 [snip] [<c01d5e50>] (nmk_pmx_enable+0x1bc/0x4d0) from [<c01d3ba8>] (pinmux_enable_setting+0x12c/0x1ec) [<c01d3ba8>] (pinmux_enable_setting+0x12c/0x1ec) from [<c01d1dc8>] (pinctrl_select_state_locked+0xfc/0x134) [<c01d1dc8>] (pinctrl_select_state_locked+0xfc/0x134) from [<c01d2814>] (pinctrl_register+0x26c/0x43c) [<c01d2814>] (pinctrl_register+0x26c/0x43c) from [<c01d668c>] (nmk_pinctrl_probe+0x114/0x238) [<c01d668c>] (nmk_pinctrl_probe+0x114/0x238) from [<c0211cc4>] (platform_drv_probe+0x28/0x2c) [<c0211cc4>] (platform_drv_probe+0x28/0x2c) from [<c0210738>] (driver_probe_device+0x84/0x21c) [<c0210738>] (driver_probe_device+0x84/0x21c) from [<c02109c0>] (__device_attach+0x50/0x54) [<c02109c0>] (__device_attach+0x50/0x54) from [<c020eb1c>] (bus_for_each_drv+0x54/0x9c) [<c020eb1c>] (bus_for_each_drv+0x54/0x9c) from [<c0210668>] (device_attach+0x84/0x9c) [<c0210668>] (device_attach+0x84/0x9c) from [<c020fbac>] (bus_probe_device+0x94/0xb8) [<c020fbac>] (bus_probe_device+0x94/0xb8) from [<c020e084>] (device_add+0x4f0/0x5bc) [<c020e084>] (device_add+0x4f0/0x5bc) from [<c0276400>] (of_device_add+0x40/0x48) [<c0276400>] (of_device_add+0x40/0x48) from [<c0276a98>] (of_platform_device_create_pdata+0x68/0x98) [<c0276a98>] (of_platform_device_create_pdata+0x68/0x98) from [<c0276bac>] (of_platform_bus_create+0xe4/0x260) [<c0276bac>] (of_platform_bus_create+0xe4/0x260) from [<c0276bf8>] (of_platform_bus_create+0x130/0x260) [<c0276bf8>] (of_platform_bus_create+0x130/0x260) from [<c0276d94>] (of_platform_populate+0x6c/0xac) [<c0276d94>] (of_platform_populate+0x6c/0xac) from [<c04a8224>] (u8500_init_machine+0x78/0x140) [<c04a8224>] (u8500_init_machine+0x78/0x140) from [<c04a3560>] (customize_machine+0x24/0x30) [<c04a3560>] (customize_machine+0x24/0x30) from [<c00087b0>] (do_one_initcall+0x130/0x1b0) [<c00087b0>] (do_one_initcall+0x130/0x1b0) from [<c033ff9c>] (kernel_init+0x138/0x2e8) [<c033ff9c>] (kernel_init+0x138/0x2e8) from [<c000eb18>] (ret_from_fork+0x14/0x20) Code: 0a00001b e19400b2 e59a200c e0822000 (e592c000) ---[ end trace 1b75b31a2719ed1c ]--- note: swapper/0[1] exited with preempt_count 1 Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-12-18 09:12:11 +00:00
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;
pinctrl: nomadik: return if prcm_base is NULL This patch adds a check for npct->prcm_base to make sure that the address is not NULL before using it, as the driver was made capable of loading even without a proper memory resource in: f1671bf pinctrl/nomadik: make independent of prcmu driver Also, refuses to probe without prcm_base on anything else than nomadik. This solves the following crash, introduced during the merge window when booting on U8500 with device tree: pinctrl-nomadik pinctrl-db8500: No PRCM base, assume no ALT-Cx control is available Unable to handle kernel NULL pointer dereference at virtual address 00000138 pgd = c0004000 [00000138] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 Not tainted (3.7.0-02892-g1ebaf4f #631) PC is at nmk_pmx_enable+0x1bc/0x4d0 LR is at clk_disable+0x40/0x44 [snip] [<c01d5e50>] (nmk_pmx_enable+0x1bc/0x4d0) from [<c01d3ba8>] (pinmux_enable_setting+0x12c/0x1ec) [<c01d3ba8>] (pinmux_enable_setting+0x12c/0x1ec) from [<c01d1dc8>] (pinctrl_select_state_locked+0xfc/0x134) [<c01d1dc8>] (pinctrl_select_state_locked+0xfc/0x134) from [<c01d2814>] (pinctrl_register+0x26c/0x43c) [<c01d2814>] (pinctrl_register+0x26c/0x43c) from [<c01d668c>] (nmk_pinctrl_probe+0x114/0x238) [<c01d668c>] (nmk_pinctrl_probe+0x114/0x238) from [<c0211cc4>] (platform_drv_probe+0x28/0x2c) [<c0211cc4>] (platform_drv_probe+0x28/0x2c) from [<c0210738>] (driver_probe_device+0x84/0x21c) [<c0210738>] (driver_probe_device+0x84/0x21c) from [<c02109c0>] (__device_attach+0x50/0x54) [<c02109c0>] (__device_attach+0x50/0x54) from [<c020eb1c>] (bus_for_each_drv+0x54/0x9c) [<c020eb1c>] (bus_for_each_drv+0x54/0x9c) from [<c0210668>] (device_attach+0x84/0x9c) [<c0210668>] (device_attach+0x84/0x9c) from [<c020fbac>] (bus_probe_device+0x94/0xb8) [<c020fbac>] (bus_probe_device+0x94/0xb8) from [<c020e084>] (device_add+0x4f0/0x5bc) [<c020e084>] (device_add+0x4f0/0x5bc) from [<c0276400>] (of_device_add+0x40/0x48) [<c0276400>] (of_device_add+0x40/0x48) from [<c0276a98>] (of_platform_device_create_pdata+0x68/0x98) [<c0276a98>] (of_platform_device_create_pdata+0x68/0x98) from [<c0276bac>] (of_platform_bus_create+0xe4/0x260) [<c0276bac>] (of_platform_bus_create+0xe4/0x260) from [<c0276bf8>] (of_platform_bus_create+0x130/0x260) [<c0276bf8>] (of_platform_bus_create+0x130/0x260) from [<c0276d94>] (of_platform_populate+0x6c/0xac) [<c0276d94>] (of_platform_populate+0x6c/0xac) from [<c04a8224>] (u8500_init_machine+0x78/0x140) [<c04a8224>] (u8500_init_machine+0x78/0x140) from [<c04a3560>] (customize_machine+0x24/0x30) [<c04a3560>] (customize_machine+0x24/0x30) from [<c00087b0>] (do_one_initcall+0x130/0x1b0) [<c00087b0>] (do_one_initcall+0x130/0x1b0) from [<c033ff9c>] (kernel_init+0x138/0x2e8) [<c033ff9c>] (kernel_init+0x138/0x2e8) from [<c000eb18>] (ret_from_fork+0x14/0x20) Code: 0a00001b e19400b2 e59a200c e0822000 (e592c000) ---[ end trace 1b75b31a2719ed1c ]--- note: swapper/0[1] exited with preempt_count 1 Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-12-18 09:12:11 +00:00
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;
}
int nmk_gpio_get_mode(int gpio)
{
struct nmk_gpio_chip *nmk_chip;
u32 afunc, bfunc, bit;
nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
if (!nmk_chip)
return -EINVAL;
bit = 1 << (gpio % NMK_GPIO_PER_CHIP);
clk_enable(nmk_chip->clk);
afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;
clk_disable(nmk_chip->clk);
return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
}
EXPORT_SYMBOL(nmk_gpio_get_mode);
/* IRQ functions */
static inline int nmk_gpio_get_bitmask(int gpio)
{
return 1 << (gpio % NMK_GPIO_PER_CHIP);
}
static void nmk_gpio_irq_ack(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
struct nmk_gpio_chip *nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
clk_enable(nmk_chip->clk);
writel(nmk_gpio_get_bitmask(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 gpio, enum nmk_gpio_irq_type which,
bool enable)
{
u32 bitmask = nmk_gpio_get_bitmask(gpio);
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 & bitmask) {
if (enable)
*rimscval |= bitmask;
else
*rimscval &= ~bitmask;
writel(*rimscval, nmk_chip->addr + rimscreg);
}
if (nmk_chip->edge_falling & bitmask) {
if (enable)
*fimscval |= bitmask;
else
*fimscval &= ~bitmask;
writel(*fimscval, nmk_chip->addr + fimscreg);
}
}
static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip,
int gpio, 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, gpio % NMK_GPIO_PER_CHIP,
NMK_GPIO_SLPM_WAKEUP_ENABLE);
}
__nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, on);
}
static int nmk_gpio_irq_maskunmask(struct irq_data *d, bool enable)
{
struct nmk_gpio_chip *nmk_chip;
unsigned long flags;
u32 bitmask;
nmk_chip = irq_data_get_irq_chip_data(d);
bitmask = nmk_gpio_get_bitmask(d->hwirq);
if (!nmk_chip)
return -EINVAL;
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 & bitmask))
__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);
return 0;
}
static void nmk_gpio_irq_mask(struct irq_data *d)
{
nmk_gpio_irq_maskunmask(d, false);
}
static void nmk_gpio_irq_unmask(struct irq_data *d)
{
nmk_gpio_irq_maskunmask(d, true);
}
static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
{
struct nmk_gpio_chip *nmk_chip;
unsigned long flags;
u32 bitmask;
nmk_chip = irq_data_get_irq_chip_data(d);
if (!nmk_chip)
return -EINVAL;
bitmask = nmk_gpio_get_bitmask(d->hwirq);
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 |= bitmask;
else
nmk_chip->real_wake &= ~bitmask;
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)
{
bool enabled = !irqd_irq_disabled(d);
bool wake = irqd_is_wakeup_set(d);
struct nmk_gpio_chip *nmk_chip;
unsigned long flags;
u32 bitmask;
nmk_chip = irq_data_get_irq_chip_data(d);
bitmask = nmk_gpio_get_bitmask(d->hwirq);
if (!nmk_chip)
return -EINVAL;
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 &= ~bitmask;
if (type & IRQ_TYPE_EDGE_RISING)
nmk_chip->edge_rising |= bitmask;
nmk_chip->edge_falling &= ~bitmask;
if (type & IRQ_TYPE_EDGE_FALLING)
nmk_chip->edge_falling |= bitmask;
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 nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);
clk_enable(nmk_chip->clk);
nmk_gpio_irq_unmask(d);
return 0;
}
static void nmk_gpio_irq_shutdown(struct irq_data *d)
{
struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);
nmk_gpio_irq_mask(d);
clk_disable(nmk_chip->clk);
}
static struct irq_chip nmk_gpio_irq_chip = {
.name = "Nomadik-GPIO",
.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,
.flags = IRQCHIP_MASK_ON_SUSPEND,
};
static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc,
u32 status)
{
struct irq_chip *host_chip = irq_get_chip(irq);
struct gpio_chip *chip = irq_desc_get_handler_data(desc);
chained_irq_enter(host_chip, desc);
while (status) {
int bit = __ffs(status);
generic_handle_irq(irq_find_mapping(chip->irqdomain, bit));
status &= ~BIT(bit);
}
chained_irq_exit(host_chip, desc);
}
static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
struct gpio_chip *chip = irq_desc_get_handler_data(desc);
struct nmk_gpio_chip *nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
u32 status;
clk_enable(nmk_chip->clk);
status = readl(nmk_chip->addr + NMK_GPIO_IS);
clk_disable(nmk_chip->clk);
__nmk_gpio_irq_handler(irq, desc, status);
}
static void nmk_gpio_latent_irq_handler(unsigned int irq,
struct irq_desc *desc)
{
struct gpio_chip *chip = irq_desc_get_handler_data(desc);
struct nmk_gpio_chip *nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
u32 status = nmk_chip->get_latent_status(nmk_chip->bank);
__nmk_gpio_irq_handler(irq, desc, status);
}
/* I/O Functions */
static int nmk_gpio_request(struct gpio_chip *chip, unsigned offset)
{
/*
* Map back to global GPIO space and request muxing, the direction
* parameter does not matter for this controller.
*/
int gpio = chip->base + offset;
return pinctrl_request_gpio(gpio);
}
static void nmk_gpio_free(struct gpio_chip *chip, unsigned offset)
{
int gpio = chip->base + offset;
pinctrl_free_gpio(gpio);
}
static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
{
struct nmk_gpio_chip *nmk_chip =
container_of(chip, struct nmk_gpio_chip, chip);
clk_enable(nmk_chip->clk);
writel(1 << 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 =
container_of(chip, struct nmk_gpio_chip, chip);
u32 bit = 1 << offset;
int value;
clk_enable(nmk_chip->clk);
value = (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
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 =
container_of(chip, struct nmk_gpio_chip, 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 =
container_of(chip, struct nmk_gpio_chip, 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
#include <linux/seq_file.h>
static void nmk_gpio_dbg_show_one(struct seq_file *s,
struct pinctrl_dev *pctldev, struct gpio_chip *chip,
unsigned offset, unsigned gpio)
{
const char *label = gpiochip_is_requested(chip, offset);
struct nmk_gpio_chip *nmk_chip =
container_of(chip, struct nmk_gpio_chip, chip);
int mode;
bool is_out;
bool pull;
u32 bit = 1 << offset;
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",
};
clk_enable(nmk_chip->clk);
is_out = !!(readl(nmk_chip->addr + NMK_GPIO_DIR) & bit);
pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & bit);
mode = nmk_gpio_get_mode(gpio);
if ((mode == NMK_GPIO_ALT_C) && pctldev)
mode = nmk_prcm_gpiocr_get_mode(pctldev, gpio);
seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s %s",
gpio, label ?: "(none)",
is_out ? "out" : "in ",
chip->get
? (chip->get(chip, offset) ? "hi" : "lo")
: "? ",
(mode < 0) ? "unknown" : modes[mode],
pull ? "pull" : "none");
if (!is_out) {
int irq = gpio_to_irq(gpio);
struct irq_desc *desc = irq_to_desc(irq);
/* This races with request_irq(), set_irq_type(),
* and set_irq_wake() ... but those are "rare".
*/
if (irq > 0 && desc && desc->action) {
char *trigger;
u32 bitmask = nmk_gpio_get_bitmask(gpio);
if (nmk_chip->edge_rising & bitmask)
trigger = "edge-rising";
else if (nmk_chip->edge_falling & bitmask)
trigger = "edge-falling";
else
trigger = "edge-undefined";
seq_printf(s, " irq-%d %s%s",
irq, trigger,
irqd_is_wakeup_set(&desc->irq_data)
? " 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
/* This structure is replicated for each GPIO block allocated at probe time */
static struct gpio_chip nmk_gpio_template = {
.request = nmk_gpio_request,
.free = nmk_gpio_free,
.direction_input = nmk_gpio_make_input,
.get = nmk_gpio_get_input,
.direction_output = nmk_gpio_make_output,
.set = nmk_gpio_set_output,
.dbg_show = nmk_gpio_dbg_show,
.can_sleep = false,
};
void nmk_gpio_clocks_enable(void)
{
int i;
for (i = 0; i < NUM_BANKS; i++) {
struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
if (!chip)
continue;
clk_enable(chip->clk);
}
}
void nmk_gpio_clocks_disable(void)
{
int i;
for (i = 0; i < NUM_BANKS; i++) {
struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
if (!chip)
continue;
clk_disable(chip->clk);
}
}
/*
* Called from the suspend/resume path to only keep the real wakeup interrupts
* (those that have had set_irq_wake() called on them) as wakeup interrupts,
* and not the rest of the interrupts which we needed to have as wakeups for
* cpuidle.
*
* PM ops are not used since this needs to be done at the end, after all the
* other drivers are done with their suspend callbacks.
*/
void nmk_gpio_wakeups_suspend(void)
{
int i;
for (i = 0; i < NUM_BANKS; i++) {
struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
if (!chip)
break;
clk_enable(chip->clk);
writel(chip->rwimsc & chip->real_wake,
chip->addr + NMK_GPIO_RWIMSC);
writel(chip->fwimsc & chip->real_wake,
chip->addr + NMK_GPIO_FWIMSC);
clk_disable(chip->clk);
}
}
void nmk_gpio_wakeups_resume(void)
{
int i;
for (i = 0; i < NUM_BANKS; i++) {
struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
if (!chip)
break;
clk_enable(chip->clk);
writel(chip->rwimsc, chip->addr + NMK_GPIO_RWIMSC);
writel(chip->fwimsc, chip->addr + NMK_GPIO_FWIMSC);
clk_disable(chip->clk);
}
}
/*
* Read the pull up/pull down status.
* A bit set in 'pull_up' means that pull up
* is selected if pull is enabled in PDIS register.
* Note: only pull up/down set via this driver can
* be detected due to HW limitations.
*/
void nmk_gpio_read_pull(int gpio_bank, u32 *pull_up)
{
if (gpio_bank < NUM_BANKS) {
struct nmk_gpio_chip *chip = nmk_gpio_chips[gpio_bank];
if (!chip)
return;
*pull_up = chip->pull_up;
}
}
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 resource *res;
struct clk *clk;
int latent_irq;
bool supports_sleepmode;
void __iomem *base;
int irq;
int ret;
if (of_get_property(np, "st,supports-sleepmode", NULL))
supports_sleepmode = true;
else
supports_sleepmode = false;
if (of_property_read_u32(np, "gpio-bank", &dev->id)) {
dev_err(&dev->dev, "gpio-bank property not found\n");
return -EINVAL;
}
irq = platform_get_irq(dev, 0);
if (irq < 0)
return irq;
/* It's OK for this IRQ not to be present */
latent_irq = platform_get_irq(dev, 1);
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&dev->dev, res);
Driver core patches for 3.9-rc1 Here is the big driver core merge for 3.9-rc1 There are two major series here, both of which touch lots of drivers all over the kernel, and will cause you some merge conflicts: - add a new function called devm_ioremap_resource() to properly be able to check return values. - remove CONFIG_EXPERIMENTAL If you need me to provide a merged tree to handle these resolutions, please let me know. Other than those patches, there's not much here, some minor fixes and updates. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) iEYEABECAAYFAlEmV0cACgkQMUfUDdst+yncCQCfbmnQZju7kzWXk6PjdFuKspT9 weAAoMCzcAtEzzc4LXuUxxG/sXBVBCjW =yWAQ -----END PGP SIGNATURE----- Merge tag 'driver-core-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core patches from Greg Kroah-Hartman: "Here is the big driver core merge for 3.9-rc1 There are two major series here, both of which touch lots of drivers all over the kernel, and will cause you some merge conflicts: - add a new function called devm_ioremap_resource() to properly be able to check return values. - remove CONFIG_EXPERIMENTAL Other than those patches, there's not much here, some minor fixes and updates" Fix up trivial conflicts * tag 'driver-core-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (221 commits) base: memory: fix soft/hard_offline_page permissions drivercore: Fix ordering between deferred_probe and exiting initcalls backlight: fix class_find_device() arguments TTY: mark tty_get_device call with the proper const values driver-core: constify data for class_find_device() firmware: Ignore abort check when no user-helper is used firmware: Reduce ifdef CONFIG_FW_LOADER_USER_HELPER firmware: Make user-mode helper optional firmware: Refactoring for splitting user-mode helper code Driver core: treat unregistered bus_types as having no devices watchdog: Convert to devm_ioremap_resource() thermal: Convert to devm_ioremap_resource() spi: Convert to devm_ioremap_resource() power: Convert to devm_ioremap_resource() mtd: Convert to devm_ioremap_resource() mmc: Convert to devm_ioremap_resource() mfd: Convert to devm_ioremap_resource() media: Convert to devm_ioremap_resource() iommu: Convert to devm_ioremap_resource() drm: Convert to devm_ioremap_resource() ...
2013-02-21 20:05:51 +00:00
if (IS_ERR(base))
return PTR_ERR(base);
clk = devm_clk_get(&dev->dev, NULL);
if (IS_ERR(clk))
return PTR_ERR(clk);
clk_prepare(clk);
nmk_chip = devm_kzalloc(&dev->dev, sizeof(*nmk_chip), GFP_KERNEL);
if (!nmk_chip)
return -ENOMEM;
/*
* 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->bank = dev->id;
nmk_chip->clk = clk;
nmk_chip->addr = base;
nmk_chip->chip = nmk_gpio_template;
nmk_chip->parent_irq = irq;
nmk_chip->latent_parent_irq = latent_irq;
nmk_chip->sleepmode = supports_sleepmode;
spin_lock_init(&nmk_chip->lock);
chip = &nmk_chip->chip;
chip->base = dev->id * NMK_GPIO_PER_CHIP;
chip->ngpio = NMK_GPIO_PER_CHIP;
chip->label = dev_name(&dev->dev);
chip->dev = &dev->dev;
chip->owner = THIS_MODULE;
clk_enable(nmk_chip->clk);
nmk_chip->lowemi = readl_relaxed(nmk_chip->addr + NMK_GPIO_LOWEMI);
clk_disable(nmk_chip->clk);
chip->of_node = np;
ret = gpiochip_add(&nmk_chip->chip);
if (ret)
return ret;
BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips));
nmk_gpio_chips[nmk_chip->bank] = nmk_chip;
platform_set_drvdata(dev, nmk_chip);
/*
* Let the generic code handle this edge IRQ, the the chained
* handler will perform the actual work of handling the parent
* interrupt.
*/
ret = gpiochip_irqchip_add(&nmk_chip->chip,
&nmk_gpio_irq_chip,
0,
handle_edge_irq,
IRQ_TYPE_EDGE_FALLING);
if (ret) {
dev_err(&dev->dev, "could not add irqchip\n");
ret = gpiochip_remove(&nmk_chip->chip);
return -ENODEV;
}
/* Then register the chain on the parent IRQ */
gpiochip_set_chained_irqchip(&nmk_chip->chip,
&nmk_gpio_irq_chip,
nmk_chip->parent_irq,
nmk_gpio_irq_handler);
if (nmk_chip->latent_parent_irq > 0)
gpiochip_set_chained_irqchip(&nmk_chip->chip,
&nmk_gpio_irq_chip,
nmk_chip->latent_parent_irq,
nmk_gpio_latent_irq_handler);
dev_info(&dev->dev, "at address %p\n", nmk_chip->addr);
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].name;
}
static int nmk_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
const unsigned **pins,
unsigned *num_pins)
{
struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
*pins = npct->soc->groups[selector].pins;
*num_pins = npct->soc->groups[selector].npins;
return 0;
}
static struct pinctrl_gpio_range *
nmk_match_gpio_range(struct pinctrl_dev *pctldev, unsigned offset)
{
struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
int i;
for (i = 0; i < npct->soc->gpio_num_ranges; i++) {
struct pinctrl_gpio_range *range;
range = &npct->soc->gpio_ranges[i];
if (offset >= range->pin_base &&
offset <= (range->pin_base + range->npins - 1))
return range;
}
return NULL;
}
static void nmk_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
unsigned offset)
{
struct pinctrl_gpio_range *range;
struct gpio_chip *chip;
range = nmk_match_gpio_range(pctldev, offset);
if (!range || !range->gc) {
seq_printf(s, "invalid pin offset");
return;
}
chip = range->gc;
nmk_gpio_dbg_show_one(s, pctldev, chip, offset - chip->base, offset);
}
static void nmk_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map, unsigned num_maps)
{
int i;
for (i = 0; i < num_maps; i++)
if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
kfree(map[i].data.configs.configs);
kfree(map);
}
static int nmk_dt_reserve_map(struct pinctrl_map **map, unsigned *reserved_maps,
unsigned *num_maps, unsigned reserve)
{
unsigned old_num = *reserved_maps;
unsigned new_num = *num_maps + reserve;
struct pinctrl_map *new_map;
if (old_num >= new_num)
return 0;
new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL);
if (!new_map)
return -ENOMEM;
memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
*map = new_map;
*reserved_maps = new_num;
return 0;
}
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)
{
int ret = 0;
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 ret;
}
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;
unsigned reserve = 0;
struct property *prop;
const char *group, *gpio_name;
struct device_node *np_config;
ret = of_property_read_string(np, "ste,function", &function);
if (ret >= 0)
reserve = 1;
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);
ret = of_property_count_strings(np, "ste,pins");
if (ret < 0)
goto exit;
if (has_config)
reserve++;
reserve *= ret;
ret = nmk_dt_reserve_map(map, reserved_maps, num_maps, reserve);
if (ret < 0)
goto exit;
of_property_for_each_string(np, "ste,pins", prop, group) {
if (function) {
ret = nmk_dt_add_map_mux(map, reserved_maps, num_maps,
group, function);
if (ret < 0)
goto exit;
}
if (has_config) {
gpio_name = nmk_find_pin_name(pctldev, group);
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) {
nmk_pinctrl_dt_free_map(pctldev, *map, *num_maps);
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 = nmk_pinctrl_dt_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_enable(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->name, g->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->npins; i++)
slpm[g->pins[i] / NMK_GPIO_PER_CHIP] &= ~BIT(g->pins[i]);
nmk_gpio_glitch_slpm_init(slpm);
}
for (i = 0; i < g->npins; i++) {
struct pinctrl_gpio_range *range;
struct nmk_gpio_chip *nmk_chip;
struct gpio_chip *chip;
unsigned bit;
range = nmk_match_gpio_range(pctldev, g->pins[i]);
if (!range) {
dev_err(npct->dev,
"invalid pin offset %d in group %s at index %d\n",
g->pins[i], g->name, i);
goto out_glitch;
}
if (!range->gc) {
dev_err(npct->dev, "GPIO chip missing in range for pin offset %d in group %s at index %d\n",
g->pins[i], g->name, i);
goto out_glitch;
}
chip = range->gc;
nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
dev_dbg(npct->dev, "setting pin %d to altsetting %d\n", g->pins[i], g->altsetting);
clk_enable(nmk_chip->clk);
bit = g->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->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 void nmk_pmx_disable(struct pinctrl_dev *pctldev,
unsigned function, unsigned group)
{
struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
const struct nmk_pingroup *g;
g = &npct->soc->groups[group];
if (g->altsetting < 0)
return;
/* Poke out the mux, set the pin to some default state? */
dev_dbg(npct->dev, "disable group %s, %u pins\n", g->name, g->npins);
}
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 = container_of(chip, struct nmk_gpio_chip, 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,
.enable = nmk_pmx_enable,
.disable = nmk_pmx_disable,
.gpio_request_enable = nmk_gpio_request_enable,
.gpio_disable_free = nmk_gpio_disable_free,
};
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;
struct pinctrl_gpio_range *range;
struct gpio_chip *chip;
unsigned bit;
pin_cfg_t cfg;
int pull, slpm, output, val, i;
bool lowemi, gpiomode, sleep;
range = nmk_match_gpio_range(pctldev, pin);
if (!range) {
dev_err(npct->dev, "invalid pin offset %d\n", pin);
return -EINVAL;
}
if (!range->gc) {
dev_err(npct->dev, "GPIO chip missing in range for pin %d\n",
pin);
return -EINVAL;
}
chip = range->gc;
nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
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.dev,
"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.dev,
"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,
},
{
.compatible = "stericsson,db8540-pinctrl",
.data = (void *)PINCTRL_NMK_DB8540,
},
{},
};
#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)
{
const struct of_device_id *match;
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;
match = of_match_device(nmk_pinctrl_match, &pdev->dev);
if (!match)
return -ENODEV;
version = (unsigned int) match->data;
/* 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);
if (version == PINCTRL_NMK_DB8540)
nmk_pinctrl_db8540_init(&npct->soc);
prcm_np = of_parse_phandle(np, "prcm", 0);
if (prcm_np)
npct->prcm_base = of_iomap(prcm_np, 0);
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;
}
}
/*
* We need all the GPIO drivers to probe FIRST, or we will not be able
* to obtain references to the struct gpio_chip * for them, and we
* need this to proceed.
*/
for (i = 0; i < npct->soc->gpio_num_ranges; i++) {
if (!nmk_gpio_chips[npct->soc->gpio_ranges[i].id]) {
dev_warn(&pdev->dev, "GPIO chip %d not registered yet\n", i);
return -EPROBE_DEFER;
}
npct->soc->gpio_ranges[i].gc = &nmk_gpio_chips[npct->soc->gpio_ranges[i].id]->chip;
}
nmk_pinctrl_desc.pins = npct->soc->pins;
nmk_pinctrl_desc.npins = npct->soc->npins;
npct->dev = &pdev->dev;
npct->pctl = pinctrl_register(&nmk_pinctrl_desc, &pdev->dev, npct);
if (!npct->pctl) {
dev_err(&pdev->dev, "could not register Nomadik pinctrl driver\n");
return -EINVAL;
}
/* We will handle a range of GPIO pins */
for (i = 0; i < npct->soc->gpio_num_ranges; i++)
pinctrl_add_gpio_range(npct->pctl, &npct->soc->gpio_ranges[i]);
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 = {
.owner = THIS_MODULE,
.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 = {
.owner = THIS_MODULE,
.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)
{
int ret;
ret = platform_driver_register(&nmk_gpio_driver);
if (ret)
return ret;
return platform_driver_register(&nmk_pinctrl_driver);
}
core_initcall(nmk_gpio_init);
MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
MODULE_DESCRIPTION("Nomadik GPIO Driver");
MODULE_LICENSE("GPL");