mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-29 22:36:48 +07:00
523bc3820f
Skip putting the GPIO module into a reset during the chip init. This makes sure to preserve any existing GPIO configurations done by pre-kernel boot code. Acked-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Sundar Iyer <sundar.iyer@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
371 lines
8.0 KiB
C
371 lines
8.0 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* License Terms: GNU General Public License, version 2
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* Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
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* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tc3589x.h>
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/**
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* tc3589x_reg_read() - read a single TC3589x register
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* @tc3589x: Device to read from
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* @reg: Register to read
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*/
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int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
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{
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int ret;
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ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
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if (ret < 0)
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dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
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reg, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tc3589x_reg_read);
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/**
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* tc3589x_reg_read() - write a single TC3589x register
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* @tc3589x: Device to write to
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* @reg: Register to read
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* @data: Value to write
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*/
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int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
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{
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int ret;
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ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
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if (ret < 0)
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dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
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reg, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tc3589x_reg_write);
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/**
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* tc3589x_block_read() - read multiple TC3589x registers
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* @tc3589x: Device to read from
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* @reg: First register
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* @length: Number of registers
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* @values: Buffer to write to
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*/
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int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values)
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{
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int ret;
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ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
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if (ret < 0)
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dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
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reg, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tc3589x_block_read);
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/**
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* tc3589x_block_write() - write multiple TC3589x registers
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* @tc3589x: Device to write to
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* @reg: First register
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* @length: Number of registers
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* @values: Values to write
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*/
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int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
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const u8 *values)
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{
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int ret;
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ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
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values);
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if (ret < 0)
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dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
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reg, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tc3589x_block_write);
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/**
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* tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
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* @tc3589x: Device to write to
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* @reg: Register to write
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* @mask: Mask of bits to set
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* @values: Value to set
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*/
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int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
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{
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int ret;
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mutex_lock(&tc3589x->lock);
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ret = tc3589x_reg_read(tc3589x, reg);
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if (ret < 0)
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goto out;
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ret &= ~mask;
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ret |= val;
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ret = tc3589x_reg_write(tc3589x, reg, ret);
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out:
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mutex_unlock(&tc3589x->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tc3589x_set_bits);
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static struct resource gpio_resources[] = {
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{
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.start = TC3589x_INT_GPIIRQ,
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.end = TC3589x_INT_GPIIRQ,
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.flags = IORESOURCE_IRQ,
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},
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};
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static struct mfd_cell tc3589x_dev_gpio[] = {
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{
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.name = "tc3589x-gpio",
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.num_resources = ARRAY_SIZE(gpio_resources),
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.resources = &gpio_resources[0],
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},
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};
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static irqreturn_t tc3589x_irq(int irq, void *data)
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{
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struct tc3589x *tc3589x = data;
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int status;
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again:
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status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
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if (status < 0)
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return IRQ_NONE;
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while (status) {
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int bit = __ffs(status);
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handle_nested_irq(tc3589x->irq_base + bit);
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status &= ~(1 << bit);
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}
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/*
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* A dummy read or write (to any register) appears to be necessary to
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* have the last interrupt clear (for example, GPIO IC write) take
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* effect. In such a case, recheck for any interrupt which is still
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* pending.
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*/
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status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
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if (status)
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goto again;
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return IRQ_HANDLED;
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}
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static void tc3589x_irq_dummy(unsigned int irq)
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{
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/* No mask/unmask at this level */
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}
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static struct irq_chip tc3589x_irq_chip = {
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.name = "tc3589x",
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.mask = tc3589x_irq_dummy,
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.unmask = tc3589x_irq_dummy,
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};
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static int tc3589x_irq_init(struct tc3589x *tc3589x)
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{
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int base = tc3589x->irq_base;
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int irq;
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for (irq = base; irq < base + TC3589x_NR_INTERNAL_IRQS; irq++) {
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set_irq_chip_data(irq, tc3589x);
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set_irq_chip_and_handler(irq, &tc3589x_irq_chip,
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handle_edge_irq);
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set_irq_nested_thread(irq, 1);
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#ifdef CONFIG_ARM
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set_irq_flags(irq, IRQF_VALID);
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#else
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set_irq_noprobe(irq);
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#endif
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}
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return 0;
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}
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static void tc3589x_irq_remove(struct tc3589x *tc3589x)
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{
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int base = tc3589x->irq_base;
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int irq;
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for (irq = base; irq < base + TC3589x_NR_INTERNAL_IRQS; irq++) {
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#ifdef CONFIG_ARM
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set_irq_flags(irq, 0);
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#endif
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set_irq_chip_and_handler(irq, NULL, NULL);
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set_irq_chip_data(irq, NULL);
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}
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}
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static int tc3589x_chip_init(struct tc3589x *tc3589x)
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{
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int manf, ver, ret;
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manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
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if (manf < 0)
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return manf;
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ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
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if (ver < 0)
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return ver;
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if (manf != TC3589x_MANFCODE_MAGIC) {
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dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
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return -EINVAL;
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}
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dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
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/*
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* Put everything except the IRQ module into reset;
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* also spare the GPIO module for any pin initialization
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* done during pre-kernel boot
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*/
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ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
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TC3589x_RSTCTRL_TIMRST
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| TC3589x_RSTCTRL_ROTRST
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| TC3589x_RSTCTRL_KBDRST);
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if (ret < 0)
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return ret;
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/* Clear the reset interrupt. */
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return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
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}
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static int __devinit tc3589x_device_init(struct tc3589x *tc3589x)
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{
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int ret = 0;
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unsigned int blocks = tc3589x->pdata->block;
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if (blocks & TC3589x_BLOCK_GPIO) {
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ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
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ARRAY_SIZE(tc3589x_dev_gpio), NULL,
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tc3589x->irq_base);
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if (ret) {
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dev_err(tc3589x->dev, "failed to add gpio child\n");
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return ret;
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}
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dev_info(tc3589x->dev, "added gpio block\n");
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}
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return ret;
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}
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static int __devinit tc3589x_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct tc3589x_platform_data *pdata = i2c->dev.platform_data;
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struct tc3589x *tc3589x;
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int ret;
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if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
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| I2C_FUNC_SMBUS_I2C_BLOCK))
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return -EIO;
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tc3589x = kzalloc(sizeof(struct tc3589x), GFP_KERNEL);
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if (!tc3589x)
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return -ENOMEM;
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mutex_init(&tc3589x->lock);
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tc3589x->dev = &i2c->dev;
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tc3589x->i2c = i2c;
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tc3589x->pdata = pdata;
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tc3589x->irq_base = pdata->irq_base;
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tc3589x->num_gpio = id->driver_data;
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i2c_set_clientdata(i2c, tc3589x);
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ret = tc3589x_chip_init(tc3589x);
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if (ret)
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goto out_free;
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ret = tc3589x_irq_init(tc3589x);
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if (ret)
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goto out_free;
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ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"tc3589x", tc3589x);
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if (ret) {
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dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
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goto out_removeirq;
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}
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ret = tc3589x_device_init(tc3589x);
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if (ret) {
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dev_err(tc3589x->dev, "failed to add child devices\n");
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goto out_freeirq;
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}
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return 0;
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out_freeirq:
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free_irq(tc3589x->i2c->irq, tc3589x);
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out_removeirq:
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tc3589x_irq_remove(tc3589x);
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out_free:
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kfree(tc3589x);
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return ret;
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}
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static int __devexit tc3589x_remove(struct i2c_client *client)
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{
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struct tc3589x *tc3589x = i2c_get_clientdata(client);
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mfd_remove_devices(tc3589x->dev);
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free_irq(tc3589x->i2c->irq, tc3589x);
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tc3589x_irq_remove(tc3589x);
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kfree(tc3589x);
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return 0;
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}
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static const struct i2c_device_id tc3589x_id[] = {
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{ "tc3589x", 24 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tc3589x_id);
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static struct i2c_driver tc3589x_driver = {
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.driver.name = "tc3589x",
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.driver.owner = THIS_MODULE,
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.probe = tc3589x_probe,
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.remove = __devexit_p(tc3589x_remove),
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.id_table = tc3589x_id,
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};
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static int __init tc3589x_init(void)
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{
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return i2c_add_driver(&tc3589x_driver);
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}
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subsys_initcall(tc3589x_init);
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static void __exit tc3589x_exit(void)
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{
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i2c_del_driver(&tc3589x_driver);
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}
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module_exit(tc3589x_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("TC3589x MFD core driver");
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MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
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