mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 15:56:47 +07:00
334a41ce9b
Use the wrapper function for retrieving the platform data instead of accessing dev->platform_data directly. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
696 lines
18 KiB
C
696 lines
18 KiB
C
/*
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* htc-i2cpld.c
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* Chip driver for an unknown CPLD chip found on omap850 HTC devices like
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* the HTC Wizard and HTC Herald.
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* The cpld is located on the i2c bus and acts as an input/output GPIO
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* extender.
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*
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* Copyright (C) 2009 Cory Maccarrone <darkstar6262@gmail.com>
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*
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* Based on work done in the linwizard project
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* Copyright (C) 2008-2009 Angelo Arrifano <miknix@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/irq.h>
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#include <linux/spinlock.h>
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#include <linux/htcpld.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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struct htcpld_chip {
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spinlock_t lock;
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/* chip info */
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u8 reset;
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u8 addr;
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struct device *dev;
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struct i2c_client *client;
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/* Output details */
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u8 cache_out;
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struct gpio_chip chip_out;
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/* Input details */
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u8 cache_in;
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struct gpio_chip chip_in;
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u16 irqs_enabled;
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uint irq_start;
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int nirqs;
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unsigned int flow_type;
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/*
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* Work structure to allow for setting values outside of any
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* possible interrupt context
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*/
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struct work_struct set_val_work;
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};
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struct htcpld_data {
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/* irq info */
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u16 irqs_enabled;
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uint irq_start;
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int nirqs;
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uint chained_irq;
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unsigned int int_reset_gpio_hi;
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unsigned int int_reset_gpio_lo;
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/* htcpld info */
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struct htcpld_chip *chip;
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unsigned int nchips;
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};
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/* There does not appear to be a way to proactively mask interrupts
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* on the htcpld chip itself. So, we simply ignore interrupts that
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* aren't desired. */
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static void htcpld_mask(struct irq_data *data)
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{
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struct htcpld_chip *chip = irq_data_get_irq_chip_data(data);
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chip->irqs_enabled &= ~(1 << (data->irq - chip->irq_start));
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pr_debug("HTCPLD mask %d %04x\n", data->irq, chip->irqs_enabled);
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}
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static void htcpld_unmask(struct irq_data *data)
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{
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struct htcpld_chip *chip = irq_data_get_irq_chip_data(data);
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chip->irqs_enabled |= 1 << (data->irq - chip->irq_start);
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pr_debug("HTCPLD unmask %d %04x\n", data->irq, chip->irqs_enabled);
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}
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static int htcpld_set_type(struct irq_data *data, unsigned int flags)
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{
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struct htcpld_chip *chip = irq_data_get_irq_chip_data(data);
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if (flags & ~IRQ_TYPE_SENSE_MASK)
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return -EINVAL;
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/* We only allow edge triggering */
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if (flags & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH))
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return -EINVAL;
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chip->flow_type = flags;
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return 0;
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}
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static struct irq_chip htcpld_muxed_chip = {
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.name = "htcpld",
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.irq_mask = htcpld_mask,
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.irq_unmask = htcpld_unmask,
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.irq_set_type = htcpld_set_type,
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};
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/* To properly dispatch IRQ events, we need to read from the
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* chip. This is an I2C action that could possibly sleep
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* (which is bad in interrupt context) -- so we use a threaded
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* interrupt handler to get around that.
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*/
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static irqreturn_t htcpld_handler(int irq, void *dev)
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{
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struct htcpld_data *htcpld = dev;
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unsigned int i;
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unsigned long flags;
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int irqpin;
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if (!htcpld) {
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pr_debug("htcpld is null in ISR\n");
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return IRQ_HANDLED;
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}
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/*
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* For each chip, do a read of the chip and trigger any interrupts
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* desired. The interrupts will be triggered from LSB to MSB (i.e.
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* bit 0 first, then bit 1, etc.)
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*
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* For chips that have no interrupt range specified, just skip 'em.
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*/
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for (i = 0; i < htcpld->nchips; i++) {
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struct htcpld_chip *chip = &htcpld->chip[i];
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struct i2c_client *client;
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int val;
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unsigned long uval, old_val;
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if (!chip) {
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pr_debug("chip %d is null in ISR\n", i);
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continue;
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}
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if (chip->nirqs == 0)
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continue;
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client = chip->client;
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if (!client) {
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pr_debug("client %d is null in ISR\n", i);
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continue;
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}
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/* Scan the chip */
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val = i2c_smbus_read_byte_data(client, chip->cache_out);
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if (val < 0) {
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/* Throw a warning and skip this chip */
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dev_warn(chip->dev, "Unable to read from chip: %d\n",
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val);
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continue;
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}
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uval = (unsigned long)val;
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spin_lock_irqsave(&chip->lock, flags);
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/* Save away the old value so we can compare it */
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old_val = chip->cache_in;
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/* Write the new value */
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chip->cache_in = uval;
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spin_unlock_irqrestore(&chip->lock, flags);
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/*
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* For each bit in the data (starting at bit 0), trigger
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* associated interrupts.
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*/
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for (irqpin = 0; irqpin < chip->nirqs; irqpin++) {
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unsigned oldb, newb, type = chip->flow_type;
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irq = chip->irq_start + irqpin;
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/* Run the IRQ handler, but only if the bit value
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* changed, and the proper flags are set */
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oldb = (old_val >> irqpin) & 1;
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newb = (uval >> irqpin) & 1;
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if ((!oldb && newb && (type & IRQ_TYPE_EDGE_RISING)) ||
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(oldb && !newb && (type & IRQ_TYPE_EDGE_FALLING))) {
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pr_debug("fire IRQ %d\n", irqpin);
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generic_handle_irq(irq);
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}
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}
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}
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/*
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* In order to continue receiving interrupts, the int_reset_gpio must
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* be asserted.
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*/
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if (htcpld->int_reset_gpio_hi)
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gpio_set_value(htcpld->int_reset_gpio_hi, 1);
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if (htcpld->int_reset_gpio_lo)
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gpio_set_value(htcpld->int_reset_gpio_lo, 0);
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return IRQ_HANDLED;
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}
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/*
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* The GPIO set routines can be called from interrupt context, especially if,
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* for example they're attached to the led-gpio framework and a trigger is
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* enabled. As such, we declared work above in the htcpld_chip structure,
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* and that work is scheduled in the set routine. The kernel can then run
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* the I2C functions, which will sleep, in process context.
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*/
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static void htcpld_chip_set(struct gpio_chip *chip, unsigned offset, int val)
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{
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struct i2c_client *client;
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struct htcpld_chip *chip_data;
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unsigned long flags;
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chip_data = container_of(chip, struct htcpld_chip, chip_out);
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if (!chip_data)
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return;
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client = chip_data->client;
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if (client == NULL)
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return;
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spin_lock_irqsave(&chip_data->lock, flags);
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if (val)
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chip_data->cache_out |= (1 << offset);
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else
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chip_data->cache_out &= ~(1 << offset);
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spin_unlock_irqrestore(&chip_data->lock, flags);
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schedule_work(&(chip_data->set_val_work));
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}
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static void htcpld_chip_set_ni(struct work_struct *work)
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{
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struct htcpld_chip *chip_data;
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struct i2c_client *client;
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chip_data = container_of(work, struct htcpld_chip, set_val_work);
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client = chip_data->client;
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i2c_smbus_read_byte_data(client, chip_data->cache_out);
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}
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static int htcpld_chip_get(struct gpio_chip *chip, unsigned offset)
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{
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struct htcpld_chip *chip_data;
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int val = 0;
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int is_input = 0;
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/* Try out first */
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chip_data = container_of(chip, struct htcpld_chip, chip_out);
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if (!chip_data) {
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/* Try in */
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is_input = 1;
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chip_data = container_of(chip, struct htcpld_chip, chip_in);
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if (!chip_data)
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return -EINVAL;
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}
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/* Determine if this is an input or output GPIO */
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if (!is_input)
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/* Use the output cache */
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val = (chip_data->cache_out >> offset) & 1;
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else
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/* Use the input cache */
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val = (chip_data->cache_in >> offset) & 1;
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if (val)
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return 1;
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else
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return 0;
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}
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static int htcpld_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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htcpld_chip_set(chip, offset, value);
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return 0;
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}
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static int htcpld_direction_input(struct gpio_chip *chip,
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unsigned offset)
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{
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/*
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* No-op: this function can only be called on the input chip.
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* We do however make sure the offset is within range.
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*/
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return (offset < chip->ngpio) ? 0 : -EINVAL;
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}
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static int htcpld_chip_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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struct htcpld_chip *chip_data;
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chip_data = container_of(chip, struct htcpld_chip, chip_in);
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if (offset < chip_data->nirqs)
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return chip_data->irq_start + offset;
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else
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return -EINVAL;
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}
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static void htcpld_chip_reset(struct i2c_client *client)
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{
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struct htcpld_chip *chip_data = i2c_get_clientdata(client);
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if (!chip_data)
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return;
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i2c_smbus_read_byte_data(
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client, (chip_data->cache_out = chip_data->reset));
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}
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static int htcpld_setup_chip_irq(
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struct platform_device *pdev,
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int chip_index)
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{
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struct htcpld_data *htcpld;
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struct device *dev = &pdev->dev;
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struct htcpld_core_platform_data *pdata;
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struct htcpld_chip *chip;
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struct htcpld_chip_platform_data *plat_chip_data;
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unsigned int irq, irq_end;
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int ret = 0;
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/* Get the platform and driver data */
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pdata = dev_get_platdata(dev);
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htcpld = platform_get_drvdata(pdev);
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chip = &htcpld->chip[chip_index];
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plat_chip_data = &pdata->chip[chip_index];
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/* Setup irq handlers */
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irq_end = chip->irq_start + chip->nirqs;
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for (irq = chip->irq_start; irq < irq_end; irq++) {
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irq_set_chip_and_handler(irq, &htcpld_muxed_chip,
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handle_simple_irq);
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irq_set_chip_data(irq, chip);
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#ifdef CONFIG_ARM
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set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
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#else
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irq_set_probe(irq);
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#endif
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}
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return ret;
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}
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static int htcpld_register_chip_i2c(
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struct platform_device *pdev,
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int chip_index)
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{
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struct htcpld_data *htcpld;
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struct device *dev = &pdev->dev;
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struct htcpld_core_platform_data *pdata;
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struct htcpld_chip *chip;
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struct htcpld_chip_platform_data *plat_chip_data;
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struct i2c_adapter *adapter;
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struct i2c_client *client;
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struct i2c_board_info info;
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/* Get the platform and driver data */
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pdata = dev_get_platdata(dev);
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htcpld = platform_get_drvdata(pdev);
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chip = &htcpld->chip[chip_index];
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plat_chip_data = &pdata->chip[chip_index];
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adapter = i2c_get_adapter(pdata->i2c_adapter_id);
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if (adapter == NULL) {
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/* Eek, no such I2C adapter! Bail out. */
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dev_warn(dev, "Chip at i2c address 0x%x: Invalid i2c adapter %d\n",
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plat_chip_data->addr, pdata->i2c_adapter_id);
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return -ENODEV;
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}
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
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dev_warn(dev, "i2c adapter %d non-functional\n",
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pdata->i2c_adapter_id);
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return -EINVAL;
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}
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memset(&info, 0, sizeof(struct i2c_board_info));
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info.addr = plat_chip_data->addr;
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strlcpy(info.type, "htcpld-chip", I2C_NAME_SIZE);
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info.platform_data = chip;
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/* Add the I2C device. This calls the probe() function. */
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client = i2c_new_device(adapter, &info);
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if (!client) {
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/* I2C device registration failed, contineu with the next */
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dev_warn(dev, "Unable to add I2C device for 0x%x\n",
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plat_chip_data->addr);
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return -ENODEV;
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}
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i2c_set_clientdata(client, chip);
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snprintf(client->name, I2C_NAME_SIZE, "Chip_0x%d", client->addr);
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chip->client = client;
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/* Reset the chip */
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htcpld_chip_reset(client);
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chip->cache_in = i2c_smbus_read_byte_data(client, chip->cache_out);
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return 0;
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}
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static void htcpld_unregister_chip_i2c(
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struct platform_device *pdev,
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int chip_index)
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{
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struct htcpld_data *htcpld;
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struct htcpld_chip *chip;
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/* Get the platform and driver data */
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htcpld = platform_get_drvdata(pdev);
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chip = &htcpld->chip[chip_index];
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if (chip->client)
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i2c_unregister_device(chip->client);
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}
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static int htcpld_register_chip_gpio(
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struct platform_device *pdev,
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int chip_index)
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{
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struct htcpld_data *htcpld;
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struct device *dev = &pdev->dev;
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struct htcpld_core_platform_data *pdata;
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struct htcpld_chip *chip;
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struct htcpld_chip_platform_data *plat_chip_data;
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struct gpio_chip *gpio_chip;
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int ret = 0;
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/* Get the platform and driver data */
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pdata = dev_get_platdata(dev);
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htcpld = platform_get_drvdata(pdev);
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chip = &htcpld->chip[chip_index];
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plat_chip_data = &pdata->chip[chip_index];
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/* Setup the GPIO chips */
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gpio_chip = &(chip->chip_out);
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gpio_chip->label = "htcpld-out";
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gpio_chip->dev = dev;
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gpio_chip->owner = THIS_MODULE;
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gpio_chip->get = htcpld_chip_get;
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gpio_chip->set = htcpld_chip_set;
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gpio_chip->direction_input = NULL;
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gpio_chip->direction_output = htcpld_direction_output;
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gpio_chip->base = plat_chip_data->gpio_out_base;
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gpio_chip->ngpio = plat_chip_data->num_gpios;
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gpio_chip = &(chip->chip_in);
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gpio_chip->label = "htcpld-in";
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gpio_chip->dev = dev;
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gpio_chip->owner = THIS_MODULE;
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gpio_chip->get = htcpld_chip_get;
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gpio_chip->set = NULL;
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gpio_chip->direction_input = htcpld_direction_input;
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gpio_chip->direction_output = NULL;
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gpio_chip->to_irq = htcpld_chip_to_irq;
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gpio_chip->base = plat_chip_data->gpio_in_base;
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gpio_chip->ngpio = plat_chip_data->num_gpios;
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/* Add the GPIO chips */
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ret = gpiochip_add(&(chip->chip_out));
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if (ret) {
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dev_warn(dev, "Unable to register output GPIOs for 0x%x: %d\n",
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plat_chip_data->addr, ret);
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return ret;
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}
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ret = gpiochip_add(&(chip->chip_in));
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if (ret) {
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int error;
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dev_warn(dev, "Unable to register input GPIOs for 0x%x: %d\n",
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plat_chip_data->addr, ret);
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error = gpiochip_remove(&(chip->chip_out));
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if (error)
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dev_warn(dev, "Error while trying to unregister gpio chip: %d\n", error);
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return ret;
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}
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return 0;
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}
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static int htcpld_setup_chips(struct platform_device *pdev)
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{
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struct htcpld_data *htcpld;
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struct device *dev = &pdev->dev;
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struct htcpld_core_platform_data *pdata;
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int i;
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|
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/* Get the platform and driver data */
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pdata = dev_get_platdata(dev);
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htcpld = platform_get_drvdata(pdev);
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/* Setup each chip's output GPIOs */
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htcpld->nchips = pdata->num_chip;
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htcpld->chip = devm_kzalloc(dev, sizeof(struct htcpld_chip) * htcpld->nchips,
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GFP_KERNEL);
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if (!htcpld->chip) {
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dev_warn(dev, "Unable to allocate memory for chips\n");
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return -ENOMEM;
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}
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|
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/* Add the chips as best we can */
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for (i = 0; i < htcpld->nchips; i++) {
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int ret;
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|
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/* Setup the HTCPLD chips */
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htcpld->chip[i].reset = pdata->chip[i].reset;
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htcpld->chip[i].cache_out = pdata->chip[i].reset;
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htcpld->chip[i].cache_in = 0;
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htcpld->chip[i].dev = dev;
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htcpld->chip[i].irq_start = pdata->chip[i].irq_base;
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htcpld->chip[i].nirqs = pdata->chip[i].num_irqs;
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INIT_WORK(&(htcpld->chip[i].set_val_work), &htcpld_chip_set_ni);
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spin_lock_init(&(htcpld->chip[i].lock));
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|
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/* Setup the interrupts for the chip */
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if (htcpld->chained_irq) {
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ret = htcpld_setup_chip_irq(pdev, i);
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if (ret)
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continue;
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}
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|
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/* Register the chip with I2C */
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ret = htcpld_register_chip_i2c(pdev, i);
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if (ret)
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continue;
|
|
|
|
|
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/* Register the chips with the GPIO subsystem */
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ret = htcpld_register_chip_gpio(pdev, i);
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if (ret) {
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/* Unregister the chip from i2c and continue */
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htcpld_unregister_chip_i2c(pdev, i);
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continue;
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}
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|
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dev_info(dev, "Registered chip at 0x%x\n", pdata->chip[i].addr);
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}
|
|
|
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return 0;
|
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}
|
|
|
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static int htcpld_core_probe(struct platform_device *pdev)
|
|
{
|
|
struct htcpld_data *htcpld;
|
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struct device *dev = &pdev->dev;
|
|
struct htcpld_core_platform_data *pdata;
|
|
struct resource *res;
|
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int ret = 0;
|
|
|
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if (!dev)
|
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return -ENODEV;
|
|
|
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pdata = dev_get_platdata(dev);
|
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if (!pdata) {
|
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dev_warn(dev, "Platform data not found for htcpld core!\n");
|
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return -ENXIO;
|
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}
|
|
|
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htcpld = devm_kzalloc(dev, sizeof(struct htcpld_data), GFP_KERNEL);
|
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if (!htcpld)
|
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return -ENOMEM;
|
|
|
|
/* Find chained irq */
|
|
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
if (res) {
|
|
int flags;
|
|
htcpld->chained_irq = res->start;
|
|
|
|
/* Setup the chained interrupt handler */
|
|
flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
|
|
ret = request_threaded_irq(htcpld->chained_irq,
|
|
NULL, htcpld_handler,
|
|
flags, pdev->name, htcpld);
|
|
if (ret) {
|
|
dev_warn(dev, "Unable to setup chained irq handler: %d\n", ret);
|
|
return ret;
|
|
} else
|
|
device_init_wakeup(dev, 0);
|
|
}
|
|
|
|
/* Set the driver data */
|
|
platform_set_drvdata(pdev, htcpld);
|
|
|
|
/* Setup the htcpld chips */
|
|
ret = htcpld_setup_chips(pdev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Request the GPIO(s) for the int reset and set them up */
|
|
if (pdata->int_reset_gpio_hi) {
|
|
ret = gpio_request(pdata->int_reset_gpio_hi, "htcpld-core");
|
|
if (ret) {
|
|
/*
|
|
* If it failed, that sucks, but we can probably
|
|
* continue on without it.
|
|
*/
|
|
dev_warn(dev, "Unable to request int_reset_gpio_hi -- interrupts may not work\n");
|
|
htcpld->int_reset_gpio_hi = 0;
|
|
} else {
|
|
htcpld->int_reset_gpio_hi = pdata->int_reset_gpio_hi;
|
|
gpio_set_value(htcpld->int_reset_gpio_hi, 1);
|
|
}
|
|
}
|
|
|
|
if (pdata->int_reset_gpio_lo) {
|
|
ret = gpio_request(pdata->int_reset_gpio_lo, "htcpld-core");
|
|
if (ret) {
|
|
/*
|
|
* If it failed, that sucks, but we can probably
|
|
* continue on without it.
|
|
*/
|
|
dev_warn(dev, "Unable to request int_reset_gpio_lo -- interrupts may not work\n");
|
|
htcpld->int_reset_gpio_lo = 0;
|
|
} else {
|
|
htcpld->int_reset_gpio_lo = pdata->int_reset_gpio_lo;
|
|
gpio_set_value(htcpld->int_reset_gpio_lo, 0);
|
|
}
|
|
}
|
|
|
|
dev_info(dev, "Initialized successfully\n");
|
|
return 0;
|
|
}
|
|
|
|
/* The I2C Driver -- used internally */
|
|
static const struct i2c_device_id htcpld_chip_id[] = {
|
|
{ "htcpld-chip", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, htcpld_chip_id);
|
|
|
|
|
|
static struct i2c_driver htcpld_chip_driver = {
|
|
.driver = {
|
|
.name = "htcpld-chip",
|
|
},
|
|
.id_table = htcpld_chip_id,
|
|
};
|
|
|
|
/* The Core Driver */
|
|
static struct platform_driver htcpld_core_driver = {
|
|
.driver = {
|
|
.name = "i2c-htcpld",
|
|
},
|
|
};
|
|
|
|
static int __init htcpld_core_init(void)
|
|
{
|
|
int ret;
|
|
|
|
/* Register the I2C Chip driver */
|
|
ret = i2c_add_driver(&htcpld_chip_driver);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Probe for our chips */
|
|
return platform_driver_probe(&htcpld_core_driver, htcpld_core_probe);
|
|
}
|
|
|
|
static void __exit htcpld_core_exit(void)
|
|
{
|
|
i2c_del_driver(&htcpld_chip_driver);
|
|
platform_driver_unregister(&htcpld_core_driver);
|
|
}
|
|
|
|
module_init(htcpld_core_init);
|
|
module_exit(htcpld_core_exit);
|
|
|
|
MODULE_AUTHOR("Cory Maccarrone <darkstar6262@gmail.com>");
|
|
MODULE_DESCRIPTION("I2C HTC PLD Driver");
|
|
MODULE_LICENSE("GPL");
|
|
|