linux/drivers/mfd/ezx-pcap.c
Linus Torvalds ad9c6ee642 spi: Updates for v5.18
The overwhelming bulk of this pull request is a change from Uwe
 Kleine-König which changes the return type of the remove() function to
 void as part of some wider work he's doing to do this for all bus types,
 causing updates to most SPI device drivers.  The branch with that on has
 been cross merged with a couple of other trees which added new SPI
 drivers this cycle, I'm not expecting any build issues resulting from
 the change.
 
 Otherwise it's been a relatively quiet release with some new device
 support, a few minor features and the welcome completion of the
 conversion of the subsystem to use GPIO descriptors rather than numbers:
 
  - Change return type of remove() to void.
  - Completion of the conversion of SPI controller drivers to use GPIO
    descriptors rather than numbers.
  - Quite a few DT schema conversions.
  - Support for multiple SPI devices on a bus in ACPI systems.
  - Big overhaul of the PXA2xx SPI driver.
  - Support for AMD AMDI0062, Intel Raptor Lake, Mediatek MT7986 and
    MT8186, nVidia Tegra210 and Tegra234, Renesas RZ/V2L, Tesla FSD and
    Sunplus SP7021.
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Merge tag 'spi-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi updates from Mark Brown:
 "The overwhelming bulk of this pull request is a change from Uwe
  Kleine-König which changes the return type of the remove() function to
  void as part of some wider work he's doing to do this for all bus
  types, causing updates to most SPI device drivers. The branch with
  that on has been cross merged with a couple of other trees which added
  new SPI drivers this cycle, I'm not expecting any build issues
  resulting from the change.

  Otherwise it's been a relatively quiet release with some new device
  support, a few minor features and the welcome completion of the
  conversion of the subsystem to use GPIO descriptors rather than
  numbers:

   - Change return type of remove() to void.

   - Completion of the conversion of SPI controller drivers to use GPIO
     descriptors rather than numbers.

   - Quite a few DT schema conversions.

   - Support for multiple SPI devices on a bus in ACPI systems.

   - Big overhaul of the PXA2xx SPI driver.

   - Support for AMD AMDI0062, Intel Raptor Lake, Mediatek MT7986 and
     MT8186, nVidia Tegra210 and Tegra234, Renesas RZ/V2L, Tesla FSD and
     Sunplus SP7021"

[ And this is obviously where that spi change that snuck into the
  regulator tree _should_ have been :^]

* tag 'spi-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (124 commits)
  spi: fsi: Implement a timeout for polling status
  spi: Fix erroneous sgs value with min_t()
  spi: tegra20: Use of_device_get_match_data()
  spi: mediatek: add ipm design support for MT7986
  spi: Add compatible for MT7986
  spi: sun4i: fix typos in comments
  spi: mediatek: support tick_delay without enhance_timing
  spi: Update clock-names property for arm pl022
  spi: rockchip-sfc: fix platform_get_irq.cocci warning
  spi: s3c64xx: Add spi port configuration for Tesla FSD SoC
  spi: dt-bindings: samsung: Add fsd spi compatible
  spi: topcliff-pch: Prevent usage of potentially stale DMA device
  spi: tegra210-quad: combined sequence mode
  spi: tegra210-quad: add acpi support
  spi: npcm-fiu: Fix typo ("npxm")
  spi: Fix Tegra QSPI example
  spi: qup: replace spin_lock_irqsave by spin_lock in hard IRQ
  spi: cadence: fix platform_get_irq.cocci warning
  spi: Update NXP Flexspi maintainer details
  dt-bindings: mfd: maxim,max77802: Convert to dtschema
  ...
2022-03-21 18:33:57 -07:00

535 lines
13 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for Motorola PCAP2 as present in EZX phones
*
* Copyright (C) 2006 Harald Welte <laforge@openezx.org>
* Copyright (C) 2009 Daniel Ribeiro <drwyrm@gmail.com>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/mfd/ezx-pcap.h>
#include <linux/spi/spi.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#define PCAP_ADC_MAXQ 8
struct pcap_adc_request {
u8 bank;
u8 ch[2];
u32 flags;
void (*callback)(void *, u16[]);
void *data;
};
struct pcap_adc_sync_request {
u16 res[2];
struct completion completion;
};
struct pcap_chip {
struct spi_device *spi;
/* IO */
u32 buf;
spinlock_t io_lock;
/* IRQ */
unsigned int irq_base;
u32 msr;
struct work_struct isr_work;
struct work_struct msr_work;
struct workqueue_struct *workqueue;
/* ADC */
struct pcap_adc_request *adc_queue[PCAP_ADC_MAXQ];
u8 adc_head;
u8 adc_tail;
spinlock_t adc_lock;
};
/* IO */
static int ezx_pcap_putget(struct pcap_chip *pcap, u32 *data)
{
struct spi_transfer t;
struct spi_message m;
int status;
memset(&t, 0, sizeof(t));
spi_message_init(&m);
t.len = sizeof(u32);
spi_message_add_tail(&t, &m);
pcap->buf = *data;
t.tx_buf = (u8 *) &pcap->buf;
t.rx_buf = (u8 *) &pcap->buf;
status = spi_sync(pcap->spi, &m);
if (status == 0)
*data = pcap->buf;
return status;
}
int ezx_pcap_write(struct pcap_chip *pcap, u8 reg_num, u32 value)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&pcap->io_lock, flags);
value &= PCAP_REGISTER_VALUE_MASK;
value |= PCAP_REGISTER_WRITE_OP_BIT
| (reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
ret = ezx_pcap_putget(pcap, &value);
spin_unlock_irqrestore(&pcap->io_lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(ezx_pcap_write);
int ezx_pcap_read(struct pcap_chip *pcap, u8 reg_num, u32 *value)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&pcap->io_lock, flags);
*value = PCAP_REGISTER_READ_OP_BIT
| (reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
ret = ezx_pcap_putget(pcap, value);
spin_unlock_irqrestore(&pcap->io_lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(ezx_pcap_read);
int ezx_pcap_set_bits(struct pcap_chip *pcap, u8 reg_num, u32 mask, u32 val)
{
unsigned long flags;
int ret;
u32 tmp = PCAP_REGISTER_READ_OP_BIT |
(reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
spin_lock_irqsave(&pcap->io_lock, flags);
ret = ezx_pcap_putget(pcap, &tmp);
if (ret)
goto out_unlock;
tmp &= (PCAP_REGISTER_VALUE_MASK & ~mask);
tmp |= (val & mask) | PCAP_REGISTER_WRITE_OP_BIT |
(reg_num << PCAP_REGISTER_ADDRESS_SHIFT);
ret = ezx_pcap_putget(pcap, &tmp);
out_unlock:
spin_unlock_irqrestore(&pcap->io_lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(ezx_pcap_set_bits);
/* IRQ */
int irq_to_pcap(struct pcap_chip *pcap, int irq)
{
return irq - pcap->irq_base;
}
EXPORT_SYMBOL_GPL(irq_to_pcap);
int pcap_to_irq(struct pcap_chip *pcap, int irq)
{
return pcap->irq_base + irq;
}
EXPORT_SYMBOL_GPL(pcap_to_irq);
static void pcap_mask_irq(struct irq_data *d)
{
struct pcap_chip *pcap = irq_data_get_irq_chip_data(d);
pcap->msr |= 1 << irq_to_pcap(pcap, d->irq);
queue_work(pcap->workqueue, &pcap->msr_work);
}
static void pcap_unmask_irq(struct irq_data *d)
{
struct pcap_chip *pcap = irq_data_get_irq_chip_data(d);
pcap->msr &= ~(1 << irq_to_pcap(pcap, d->irq));
queue_work(pcap->workqueue, &pcap->msr_work);
}
static struct irq_chip pcap_irq_chip = {
.name = "pcap",
.irq_disable = pcap_mask_irq,
.irq_mask = pcap_mask_irq,
.irq_unmask = pcap_unmask_irq,
};
static void pcap_msr_work(struct work_struct *work)
{
struct pcap_chip *pcap = container_of(work, struct pcap_chip, msr_work);
ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);
}
static void pcap_isr_work(struct work_struct *work)
{
struct pcap_chip *pcap = container_of(work, struct pcap_chip, isr_work);
struct pcap_platform_data *pdata = dev_get_platdata(&pcap->spi->dev);
u32 msr, isr, int_sel, service;
int irq;
do {
ezx_pcap_read(pcap, PCAP_REG_MSR, &msr);
ezx_pcap_read(pcap, PCAP_REG_ISR, &isr);
/* We can't service/ack irqs that are assigned to port 2 */
if (!(pdata->config & PCAP_SECOND_PORT)) {
ezx_pcap_read(pcap, PCAP_REG_INT_SEL, &int_sel);
isr &= ~int_sel;
}
ezx_pcap_write(pcap, PCAP_REG_MSR, isr | msr);
ezx_pcap_write(pcap, PCAP_REG_ISR, isr);
service = isr & ~msr;
for (irq = pcap->irq_base; service; service >>= 1, irq++) {
if (service & 1)
generic_handle_irq_safe(irq);
}
ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);
} while (gpio_get_value(pdata->gpio));
}
static void pcap_irq_handler(struct irq_desc *desc)
{
struct pcap_chip *pcap = irq_desc_get_handler_data(desc);
desc->irq_data.chip->irq_ack(&desc->irq_data);
queue_work(pcap->workqueue, &pcap->isr_work);
}
/* ADC */
void pcap_set_ts_bits(struct pcap_chip *pcap, u32 bits)
{
unsigned long flags;
u32 tmp;
spin_lock_irqsave(&pcap->adc_lock, flags);
ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
tmp &= ~(PCAP_ADC_TS_M_MASK | PCAP_ADC_TS_REF_LOWPWR);
tmp |= bits & (PCAP_ADC_TS_M_MASK | PCAP_ADC_TS_REF_LOWPWR);
ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
spin_unlock_irqrestore(&pcap->adc_lock, flags);
}
EXPORT_SYMBOL_GPL(pcap_set_ts_bits);
static void pcap_disable_adc(struct pcap_chip *pcap)
{
u32 tmp;
ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
tmp &= ~(PCAP_ADC_ADEN|PCAP_ADC_BATT_I_ADC|PCAP_ADC_BATT_I_POLARITY);
ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
}
static void pcap_adc_trigger(struct pcap_chip *pcap)
{
unsigned long flags;
u32 tmp;
u8 head;
spin_lock_irqsave(&pcap->adc_lock, flags);
head = pcap->adc_head;
if (!pcap->adc_queue[head]) {
/* queue is empty, save power */
pcap_disable_adc(pcap);
spin_unlock_irqrestore(&pcap->adc_lock, flags);
return;
}
/* start conversion on requested bank, save TS_M bits */
ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
tmp &= (PCAP_ADC_TS_M_MASK | PCAP_ADC_TS_REF_LOWPWR);
tmp |= pcap->adc_queue[head]->flags | PCAP_ADC_ADEN;
if (pcap->adc_queue[head]->bank == PCAP_ADC_BANK_1)
tmp |= PCAP_ADC_AD_SEL1;
ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
spin_unlock_irqrestore(&pcap->adc_lock, flags);
ezx_pcap_write(pcap, PCAP_REG_ADR, PCAP_ADR_ASC);
}
static irqreturn_t pcap_adc_irq(int irq, void *_pcap)
{
struct pcap_chip *pcap = _pcap;
struct pcap_adc_request *req;
u16 res[2];
u32 tmp;
spin_lock(&pcap->adc_lock);
req = pcap->adc_queue[pcap->adc_head];
if (WARN(!req, "adc irq without pending request\n")) {
spin_unlock(&pcap->adc_lock);
return IRQ_HANDLED;
}
/* read requested channels results */
ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
tmp &= ~(PCAP_ADC_ADA1_MASK | PCAP_ADC_ADA2_MASK);
tmp |= (req->ch[0] << PCAP_ADC_ADA1_SHIFT);
tmp |= (req->ch[1] << PCAP_ADC_ADA2_SHIFT);
ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
ezx_pcap_read(pcap, PCAP_REG_ADR, &tmp);
res[0] = (tmp & PCAP_ADR_ADD1_MASK) >> PCAP_ADR_ADD1_SHIFT;
res[1] = (tmp & PCAP_ADR_ADD2_MASK) >> PCAP_ADR_ADD2_SHIFT;
pcap->adc_queue[pcap->adc_head] = NULL;
pcap->adc_head = (pcap->adc_head + 1) & (PCAP_ADC_MAXQ - 1);
spin_unlock(&pcap->adc_lock);
/* pass the results and release memory */
req->callback(req->data, res);
kfree(req);
/* trigger next conversion (if any) on queue */
pcap_adc_trigger(pcap);
return IRQ_HANDLED;
}
int pcap_adc_async(struct pcap_chip *pcap, u8 bank, u32 flags, u8 ch[],
void *callback, void *data)
{
struct pcap_adc_request *req;
unsigned long irq_flags;
/* This will be freed after we have a result */
req = kmalloc(sizeof(struct pcap_adc_request), GFP_KERNEL);
if (!req)
return -ENOMEM;
req->bank = bank;
req->flags = flags;
req->ch[0] = ch[0];
req->ch[1] = ch[1];
req->callback = callback;
req->data = data;
spin_lock_irqsave(&pcap->adc_lock, irq_flags);
if (pcap->adc_queue[pcap->adc_tail]) {
spin_unlock_irqrestore(&pcap->adc_lock, irq_flags);
kfree(req);
return -EBUSY;
}
pcap->adc_queue[pcap->adc_tail] = req;
pcap->adc_tail = (pcap->adc_tail + 1) & (PCAP_ADC_MAXQ - 1);
spin_unlock_irqrestore(&pcap->adc_lock, irq_flags);
/* start conversion */
pcap_adc_trigger(pcap);
return 0;
}
EXPORT_SYMBOL_GPL(pcap_adc_async);
static void pcap_adc_sync_cb(void *param, u16 res[])
{
struct pcap_adc_sync_request *req = param;
req->res[0] = res[0];
req->res[1] = res[1];
complete(&req->completion);
}
int pcap_adc_sync(struct pcap_chip *pcap, u8 bank, u32 flags, u8 ch[],
u16 res[])
{
struct pcap_adc_sync_request sync_data;
int ret;
init_completion(&sync_data.completion);
ret = pcap_adc_async(pcap, bank, flags, ch, pcap_adc_sync_cb,
&sync_data);
if (ret)
return ret;
wait_for_completion(&sync_data.completion);
res[0] = sync_data.res[0];
res[1] = sync_data.res[1];
return 0;
}
EXPORT_SYMBOL_GPL(pcap_adc_sync);
/* subdevs */
static int pcap_remove_subdev(struct device *dev, void *unused)
{
platform_device_unregister(to_platform_device(dev));
return 0;
}
static int pcap_add_subdev(struct pcap_chip *pcap,
struct pcap_subdev *subdev)
{
struct platform_device *pdev;
int ret;
pdev = platform_device_alloc(subdev->name, subdev->id);
if (!pdev)
return -ENOMEM;
pdev->dev.parent = &pcap->spi->dev;
pdev->dev.platform_data = subdev->platform_data;
ret = platform_device_add(pdev);
if (ret)
platform_device_put(pdev);
return ret;
}
static void ezx_pcap_remove(struct spi_device *spi)
{
struct pcap_chip *pcap = spi_get_drvdata(spi);
unsigned long flags;
int i;
/* remove all registered subdevs */
device_for_each_child(&spi->dev, NULL, pcap_remove_subdev);
/* cleanup ADC */
spin_lock_irqsave(&pcap->adc_lock, flags);
for (i = 0; i < PCAP_ADC_MAXQ; i++)
kfree(pcap->adc_queue[i]);
spin_unlock_irqrestore(&pcap->adc_lock, flags);
/* cleanup irqchip */
for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++)
irq_set_chip_and_handler(i, NULL, NULL);
destroy_workqueue(pcap->workqueue);
}
static int ezx_pcap_probe(struct spi_device *spi)
{
struct pcap_platform_data *pdata = dev_get_platdata(&spi->dev);
struct pcap_chip *pcap;
int i, adc_irq;
int ret = -ENODEV;
/* platform data is required */
if (!pdata)
goto ret;
pcap = devm_kzalloc(&spi->dev, sizeof(*pcap), GFP_KERNEL);
if (!pcap) {
ret = -ENOMEM;
goto ret;
}
spin_lock_init(&pcap->io_lock);
spin_lock_init(&pcap->adc_lock);
INIT_WORK(&pcap->isr_work, pcap_isr_work);
INIT_WORK(&pcap->msr_work, pcap_msr_work);
spi_set_drvdata(spi, pcap);
/* setup spi */
spi->bits_per_word = 32;
spi->mode = SPI_MODE_0 | (pdata->config & PCAP_CS_AH ? SPI_CS_HIGH : 0);
ret = spi_setup(spi);
if (ret)
goto ret;
pcap->spi = spi;
/* setup irq */
pcap->irq_base = pdata->irq_base;
pcap->workqueue = create_singlethread_workqueue("pcapd");
if (!pcap->workqueue) {
ret = -ENOMEM;
dev_err(&spi->dev, "can't create pcap thread\n");
goto ret;
}
/* redirect interrupts to AP, except adcdone2 */
if (!(pdata->config & PCAP_SECOND_PORT))
ezx_pcap_write(pcap, PCAP_REG_INT_SEL,
(1 << PCAP_IRQ_ADCDONE2));
/* setup irq chip */
for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++) {
irq_set_chip_and_handler(i, &pcap_irq_chip, handle_simple_irq);
irq_set_chip_data(i, pcap);
irq_clear_status_flags(i, IRQ_NOREQUEST | IRQ_NOPROBE);
}
/* mask/ack all PCAP interrupts */
ezx_pcap_write(pcap, PCAP_REG_MSR, PCAP_MASK_ALL_INTERRUPT);
ezx_pcap_write(pcap, PCAP_REG_ISR, PCAP_CLEAR_INTERRUPT_REGISTER);
pcap->msr = PCAP_MASK_ALL_INTERRUPT;
irq_set_irq_type(spi->irq, IRQ_TYPE_EDGE_RISING);
irq_set_chained_handler_and_data(spi->irq, pcap_irq_handler, pcap);
irq_set_irq_wake(spi->irq, 1);
/* ADC */
adc_irq = pcap_to_irq(pcap, (pdata->config & PCAP_SECOND_PORT) ?
PCAP_IRQ_ADCDONE2 : PCAP_IRQ_ADCDONE);
ret = devm_request_irq(&spi->dev, adc_irq, pcap_adc_irq, 0, "ADC",
pcap);
if (ret)
goto free_irqchip;
/* setup subdevs */
for (i = 0; i < pdata->num_subdevs; i++) {
ret = pcap_add_subdev(pcap, &pdata->subdevs[i]);
if (ret)
goto remove_subdevs;
}
/* board specific quirks */
if (pdata->init)
pdata->init(pcap);
return 0;
remove_subdevs:
device_for_each_child(&spi->dev, NULL, pcap_remove_subdev);
free_irqchip:
for (i = pcap->irq_base; i < (pcap->irq_base + PCAP_NIRQS); i++)
irq_set_chip_and_handler(i, NULL, NULL);
/* destroy_workqueue: */
destroy_workqueue(pcap->workqueue);
ret:
return ret;
}
static struct spi_driver ezxpcap_driver = {
.probe = ezx_pcap_probe,
.remove = ezx_pcap_remove,
.driver = {
.name = "ezx-pcap",
},
};
static int __init ezx_pcap_init(void)
{
return spi_register_driver(&ezxpcap_driver);
}
static void __exit ezx_pcap_exit(void)
{
spi_unregister_driver(&ezxpcap_driver);
}
subsys_initcall(ezx_pcap_init);
module_exit(ezx_pcap_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");
MODULE_DESCRIPTION("Motorola PCAP2 ASIC Driver");
MODULE_ALIAS("spi:ezx-pcap");