mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 14:06:48 +07:00
58cf279aca
Infrastructural changes: - In struct gpio_chip, rename the .dev node to .parent to better reflect the fact that this is not the GPIO struct device abstraction. We will add that soon so this would be totallt confusing. - It was noted that the driver .get_value() callbacks was sometimes reporting negative -ERR values to the gpiolib core, expecting them to be propagated to consumer gpiod_get_value() and gpio_get_value() calls. This was not happening, so as there was a mess of drivers returning negative errors and some returning "anything else than zero" to indicate that a line was active. As some would have bit 31 set to indicate "line active" it clashed with negative error codes. This is fixed by the largeish series clamping values in all drivers with !!value to [0,1] and then augmenting the code to propagate error codes to consumers. (Includes some ACKed patches in other subsystems.) - Add a void *data pointer to struct gpio_chip. The container_of() design pattern is indeed very nice, but we want to reform the struct gpio_chip to be a non-volative, stateless business, and keep states internal to the gpiolib to be able to hold on to the state when adding a proper userspace ABI (character device) further down the road. To achieve this, drivers need a handle at the internal state that is not dependent on their struct gpio_chip() so we add gpiochip_add_data() and gpiochip_get_data() following the pattern of many other subsystems. All the "use gpiochip data pointer" patches transforms drivers to this scheme. - The Generic GPIO chip header has been merged into the general <linux/gpio/driver.h> header, and the custom header for that removed. Instead of having a separate mm_gpio_chip struct for these generic drivers, merge that into struct gpio_chip, simplifying the code and removing the need for separate and confusing includes. Misc improvements: - Stabilize the way GPIOs are looked up from the ACPI legacy specification. - Incremental driver features for PXA, PCA953X, Lantiq (patches from the OpenWRT community), RCAR, Zynq, PL061, 104-idi-48 New drivers: - Add a GPIO chip to the ALSA SoC AC97 driver. - Add a new Broadcom NSP SoC driver (this lands in the pinctrl dir, but the branch is merged here too to account for infrastructural changes). - The sx150x driver now supports the sx1502. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJWmsZhAAoJEEEQszewGV1ztq0QAJ1KbNOpmf/s3INkOH4r771Z WIrNEsmwwLIAryo8gKNOM0H1zCwhRUV7hIE5jYWgD6JvjuAN6vobMlZAq21j6YpB pKgqnI5DuoND450xjb8wSwGQ5NTYp1rFXNmwCrtyTjOle6AAW+Kp2cvVWxVr77Av uJinRuuBr9GOKW/yYM1Fw/6EPjkvvhVOb+LBguRyVvq0s5Peyw7ZVeY1tjgPHJLn oSZ9dmPUjHEn91oZQbtfro3plOObcxdgJ8vo//pgEmyhMeR8XjXES+aUfErxqWOU PimrZuMMy4cxnsqWwh3Dyxo7KSWfJKfSPRwnGwc/HgbHZEoWxOZI1ezRtGKrRQtj vubxp5dUBA5z66TMsOCeJtzKVSofkvgX2Wr/Y9jKp5oy9cHdAZv9+jEHV1pr6asz Tas97MmmO77XuRI/GPDqVHx8dfa15OIz9s92+Gu64KxNzVxTo4+NdoPSNxkbCILO FKn7EmU3D0OjmN2NJ9GAURoFaj3BBUgNhaxacG9j2bieyh+euuUHRtyh2k8zXR9y 8OnY1UOrTUYF8YIq9pXZxMQRD/lqwCNHvEjtI6BqMcNx4MptfTL+FKYUkn/SgCYk QTNV6Ui+ety5D5aEpp5q0ItGsrDJ2LYSItsS+cOtMy2ieOxbQav9NWwu7eI3l5ly gwYTZjG9p9joPXLW0E3g =63rR -----END PGP SIGNATURE----- Merge tag 'gpio-v4.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio Pull GPIO updates from Linus Walleij: "Here is the bulk of GPIO changes for v4.5. Notably there are big refactorings mostly by myself, aimed at getting the gpio_chip into a shape that makes me believe I can proceed to preserve state for a proper userspace ABI (character device) that has already been proposed once, but resulted in the feedback that I need to go back and restructure stuff. So I've been restructuring stuff. On the way I ran into brokenness (return code from the get_value() callback) and had to fix it. Also, refactored generic GPIO to be simpler. Some of that is still waiting to trickle down from the subsystems all over the kernel that provide random gpio_chips, I've touched every single GPIO driver in the kernel now, oh man I didn't know I was responsible for so much... Apart from that we're churning along as usual. I took some effort to test and retest so it should merge nicely and we shook out a couple of bugs in -next. Infrastructural changes: - In struct gpio_chip, rename the .dev node to .parent to better reflect the fact that this is not the GPIO struct device abstraction. We will add that soon so this would be totallt confusing. - It was noted that the driver .get_value() callbacks was sometimes reporting negative -ERR values to the gpiolib core, expecting them to be propagated to consumer gpiod_get_value() and gpio_get_value() calls. This was not happening, so as there was a mess of drivers returning negative errors and some returning "anything else than zero" to indicate that a line was active. As some would have bit 31 set to indicate "line active" it clashed with negative error codes. This is fixed by the largeish series clamping values in all drivers with !!value to [0,1] and then augmenting the code to propagate error codes to consumers. (Includes some ACKed patches in other subsystems.) - Add a void *data pointer to struct gpio_chip. The container_of() design pattern is indeed very nice, but we want to reform the struct gpio_chip to be a non-volative, stateless business, and keep states internal to the gpiolib to be able to hold on to the state when adding a proper userspace ABI (character device) further down the road. To achieve this, drivers need a handle at the internal state that is not dependent on their struct gpio_chip() so we add gpiochip_add_data() and gpiochip_get_data() following the pattern of many other subsystems. All the "use gpiochip data pointer" patches transforms drivers to this scheme. - The Generic GPIO chip header has been merged into the general <linux/gpio/driver.h> header, and the custom header for that removed. Instead of having a separate mm_gpio_chip struct for these generic drivers, merge that into struct gpio_chip, simplifying the code and removing the need for separate and confusing includes. Misc improvements: - Stabilize the way GPIOs are looked up from the ACPI legacy specification. - Incremental driver features for PXA, PCA953X, Lantiq (patches from the OpenWRT community), RCAR, Zynq, PL061, 104-idi-48 New drivers: - Add a GPIO chip to the ALSA SoC AC97 driver. - Add a new Broadcom NSP SoC driver (this lands in the pinctrl dir, but the branch is merged here too to account for infrastructural changes). - The sx150x driver now supports the sx1502" * tag 'gpio-v4.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (220 commits) gpio: generic: make bgpio_pdata always visible gpiolib: fix chip order in gpio list gpio: mpc8xxx: Do not use gpiochip_get_data() in mpc8xxx_gpio_save_regs() gpio: mm-lantiq: Do not use gpiochip_get_data() in ltq_mm_save_regs() gpio: brcmstb: Allow building driver for BMIPS_GENERIC gpio: brcmstb: Set endian flags for big-endian MIPS gpio: moxart: fix build regression gpio: xilinx: Do not use gpiochip_get_data() in xgpio_save_regs() leds: pca9532: use gpiochip data pointer leds: tca6507: use gpiochip data pointer hid: cp2112: use gpiochip data pointer bcma: gpio: use gpiochip data pointer avr32: gpio: use gpiochip data pointer video: fbdev: via: use gpiochip data pointer gpio: pch: Optimize pch_gpio_get() Revert "pinctrl: lantiq: Implement gpio_chip.to_irq" pinctrl: nsp-gpio: use gpiochip data pointer pinctrl: vt8500-wmt: use gpiochip data pointer pinctrl: exynos5440: use gpiochip data pointer pinctrl: at91-pio4: use gpiochip data pointer ...
441 lines
11 KiB
C
441 lines
11 KiB
C
/*
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* Support for the GPIO/IRQ expander chips present on several HTC phones.
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* These are implemented in CPLD chips present on the board.
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*
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* Copyright (c) 2007 Kevin O'Connor <kevin@koconnor.net>
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* Copyright (c) 2007 Philipp Zabel <philipp.zabel@gmail.com>
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*
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* This file may be distributed under the terms of the GNU GPL license.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/mfd/htc-egpio.h>
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struct egpio_chip {
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int reg_start;
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int cached_values;
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unsigned long is_out;
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struct device *dev;
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struct gpio_chip chip;
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};
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struct egpio_info {
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spinlock_t lock;
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/* iomem info */
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void __iomem *base_addr;
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int bus_shift; /* byte shift */
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int reg_shift; /* bit shift */
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int reg_mask;
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/* irq info */
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int ack_register;
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int ack_write;
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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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/* egpio info */
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struct egpio_chip *chip;
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int nchips;
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};
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static inline void egpio_writew(u16 value, struct egpio_info *ei, int reg)
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{
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writew(value, ei->base_addr + (reg << ei->bus_shift));
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}
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static inline u16 egpio_readw(struct egpio_info *ei, int reg)
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{
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return readw(ei->base_addr + (reg << ei->bus_shift));
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}
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/*
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* IRQs
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*/
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static inline void ack_irqs(struct egpio_info *ei)
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{
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egpio_writew(ei->ack_write, ei, ei->ack_register);
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pr_debug("EGPIO ack - write %x to base+%x\n",
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ei->ack_write, ei->ack_register << ei->bus_shift);
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}
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static void egpio_ack(struct irq_data *data)
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{
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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 egpio chip itself. So, we simply ignore interrupts that
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* aren't desired. */
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static void egpio_mask(struct irq_data *data)
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{
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struct egpio_info *ei = irq_data_get_irq_chip_data(data);
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ei->irqs_enabled &= ~(1 << (data->irq - ei->irq_start));
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pr_debug("EGPIO mask %d %04x\n", data->irq, ei->irqs_enabled);
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}
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static void egpio_unmask(struct irq_data *data)
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{
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struct egpio_info *ei = irq_data_get_irq_chip_data(data);
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ei->irqs_enabled |= 1 << (data->irq - ei->irq_start);
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pr_debug("EGPIO unmask %d %04x\n", data->irq, ei->irqs_enabled);
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}
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static struct irq_chip egpio_muxed_chip = {
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.name = "htc-egpio",
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.irq_ack = egpio_ack,
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.irq_mask = egpio_mask,
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.irq_unmask = egpio_unmask,
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};
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static void egpio_handler(struct irq_desc *desc)
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{
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struct egpio_info *ei = irq_desc_get_handler_data(desc);
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int irqpin;
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/* Read current pins. */
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unsigned long readval = egpio_readw(ei, ei->ack_register);
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pr_debug("IRQ reg: %x\n", (unsigned int)readval);
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/* Ack/unmask interrupts. */
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ack_irqs(ei);
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/* Process all set pins. */
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readval &= ei->irqs_enabled;
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for_each_set_bit(irqpin, &readval, ei->nirqs) {
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/* Run irq handler */
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pr_debug("got IRQ %d\n", irqpin);
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generic_handle_irq(ei->irq_start + irqpin);
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}
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}
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int htc_egpio_get_wakeup_irq(struct device *dev)
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{
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struct egpio_info *ei = dev_get_drvdata(dev);
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/* Read current pins. */
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u16 readval = egpio_readw(ei, ei->ack_register);
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/* Ack/unmask interrupts. */
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ack_irqs(ei);
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/* Return first set pin. */
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readval &= ei->irqs_enabled;
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return ei->irq_start + ffs(readval) - 1;
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}
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EXPORT_SYMBOL(htc_egpio_get_wakeup_irq);
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static inline int egpio_pos(struct egpio_info *ei, int bit)
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{
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return bit >> ei->reg_shift;
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}
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static inline int egpio_bit(struct egpio_info *ei, int bit)
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{
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return 1 << (bit & ((1 << ei->reg_shift)-1));
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}
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/*
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* Input pins
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*/
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static int egpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct egpio_chip *egpio;
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struct egpio_info *ei;
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unsigned bit;
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int reg;
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int value;
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pr_debug("egpio_get_value(%d)\n", chip->base + offset);
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egpio = container_of(chip, struct egpio_chip, chip);
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ei = dev_get_drvdata(egpio->dev);
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bit = egpio_bit(ei, offset);
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reg = egpio->reg_start + egpio_pos(ei, offset);
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value = egpio_readw(ei, reg);
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pr_debug("readw(%p + %x) = %x\n",
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ei->base_addr, reg << ei->bus_shift, value);
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return !!(value & bit);
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}
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static int egpio_direction_input(struct gpio_chip *chip, unsigned offset)
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{
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struct egpio_chip *egpio;
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egpio = container_of(chip, struct egpio_chip, chip);
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return test_bit(offset, &egpio->is_out) ? -EINVAL : 0;
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}
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/*
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* Output pins
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*/
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static void egpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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unsigned long flag;
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struct egpio_chip *egpio;
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struct egpio_info *ei;
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unsigned bit;
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int pos;
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int reg;
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int shift;
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pr_debug("egpio_set(%s, %d(%d), %d)\n",
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chip->label, offset, offset+chip->base, value);
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egpio = container_of(chip, struct egpio_chip, chip);
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ei = dev_get_drvdata(egpio->dev);
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bit = egpio_bit(ei, offset);
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pos = egpio_pos(ei, offset);
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reg = egpio->reg_start + pos;
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shift = pos << ei->reg_shift;
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pr_debug("egpio %s: reg %d = 0x%04x\n", value ? "set" : "clear",
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reg, (egpio->cached_values >> shift) & ei->reg_mask);
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spin_lock_irqsave(&ei->lock, flag);
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if (value)
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egpio->cached_values |= (1 << offset);
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else
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egpio->cached_values &= ~(1 << offset);
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egpio_writew((egpio->cached_values >> shift) & ei->reg_mask, ei, reg);
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spin_unlock_irqrestore(&ei->lock, flag);
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}
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static int egpio_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct egpio_chip *egpio;
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egpio = container_of(chip, struct egpio_chip, chip);
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if (test_bit(offset, &egpio->is_out)) {
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egpio_set(chip, offset, value);
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return 0;
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} else {
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return -EINVAL;
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}
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}
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static void egpio_write_cache(struct egpio_info *ei)
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{
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int i;
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struct egpio_chip *egpio;
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int shift;
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for (i = 0; i < ei->nchips; i++) {
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egpio = &(ei->chip[i]);
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if (!egpio->is_out)
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continue;
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for (shift = 0; shift < egpio->chip.ngpio;
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shift += (1<<ei->reg_shift)) {
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int reg = egpio->reg_start + egpio_pos(ei, shift);
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if (!((egpio->is_out >> shift) & ei->reg_mask))
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continue;
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pr_debug("EGPIO: setting %x to %x, was %x\n", reg,
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(egpio->cached_values >> shift) & ei->reg_mask,
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egpio_readw(ei, reg));
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egpio_writew((egpio->cached_values >> shift)
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& ei->reg_mask, ei, reg);
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}
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}
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}
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/*
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* Setup
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*/
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static int __init egpio_probe(struct platform_device *pdev)
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{
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struct htc_egpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct resource *res;
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struct egpio_info *ei;
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struct gpio_chip *chip;
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unsigned int irq, irq_end;
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int i;
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int ret;
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/* Initialize ei data structure. */
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ei = devm_kzalloc(&pdev->dev, sizeof(*ei), GFP_KERNEL);
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if (!ei)
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return -ENOMEM;
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spin_lock_init(&ei->lock);
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/* Find chained irq */
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ret = -EINVAL;
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res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (res)
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ei->chained_irq = res->start;
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/* Map egpio chip into virtual address space. */
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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goto fail;
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ei->base_addr = devm_ioremap_nocache(&pdev->dev, res->start,
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resource_size(res));
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if (!ei->base_addr)
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goto fail;
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pr_debug("EGPIO phys=%08x virt=%p\n", (u32)res->start, ei->base_addr);
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if ((pdata->bus_width != 16) && (pdata->bus_width != 32))
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goto fail;
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ei->bus_shift = fls(pdata->bus_width - 1) - 3;
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pr_debug("bus_shift = %d\n", ei->bus_shift);
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if ((pdata->reg_width != 8) && (pdata->reg_width != 16))
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goto fail;
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ei->reg_shift = fls(pdata->reg_width - 1);
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pr_debug("reg_shift = %d\n", ei->reg_shift);
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ei->reg_mask = (1 << pdata->reg_width) - 1;
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platform_set_drvdata(pdev, ei);
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ei->nchips = pdata->num_chips;
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ei->chip = devm_kzalloc(&pdev->dev,
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sizeof(struct egpio_chip) * ei->nchips,
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GFP_KERNEL);
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if (!ei->chip) {
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ret = -ENOMEM;
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goto fail;
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}
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for (i = 0; i < ei->nchips; i++) {
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ei->chip[i].reg_start = pdata->chip[i].reg_start;
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ei->chip[i].cached_values = pdata->chip[i].initial_values;
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ei->chip[i].is_out = pdata->chip[i].direction;
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ei->chip[i].dev = &(pdev->dev);
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chip = &(ei->chip[i].chip);
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chip->label = "htc-egpio";
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chip->parent = &pdev->dev;
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chip->owner = THIS_MODULE;
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chip->get = egpio_get;
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chip->set = egpio_set;
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chip->direction_input = egpio_direction_input;
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chip->direction_output = egpio_direction_output;
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chip->base = pdata->chip[i].gpio_base;
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chip->ngpio = pdata->chip[i].num_gpios;
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gpiochip_add(chip);
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}
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/* Set initial pin values */
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egpio_write_cache(ei);
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ei->irq_start = pdata->irq_base;
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ei->nirqs = pdata->num_irqs;
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ei->ack_register = pdata->ack_register;
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if (ei->chained_irq) {
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/* Setup irq handlers */
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ei->ack_write = 0xFFFF;
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if (pdata->invert_acks)
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ei->ack_write = 0;
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irq_end = ei->irq_start + ei->nirqs;
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for (irq = ei->irq_start; irq < irq_end; irq++) {
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irq_set_chip_and_handler(irq, &egpio_muxed_chip,
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handle_simple_irq);
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irq_set_chip_data(irq, ei);
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irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
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}
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irq_set_irq_type(ei->chained_irq, IRQ_TYPE_EDGE_RISING);
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irq_set_chained_handler_and_data(ei->chained_irq,
|
|
egpio_handler, ei);
|
|
ack_irqs(ei);
|
|
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
printk(KERN_ERR "EGPIO failed to setup\n");
|
|
return ret;
|
|
}
|
|
|
|
static int __exit egpio_remove(struct platform_device *pdev)
|
|
{
|
|
struct egpio_info *ei = platform_get_drvdata(pdev);
|
|
unsigned int irq, irq_end;
|
|
|
|
if (ei->chained_irq) {
|
|
irq_end = ei->irq_start + ei->nirqs;
|
|
for (irq = ei->irq_start; irq < irq_end; irq++) {
|
|
irq_set_chip_and_handler(irq, NULL, NULL);
|
|
irq_set_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
|
|
}
|
|
irq_set_chained_handler(ei->chained_irq, NULL);
|
|
device_init_wakeup(&pdev->dev, 0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int egpio_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
struct egpio_info *ei = platform_get_drvdata(pdev);
|
|
|
|
if (ei->chained_irq && device_may_wakeup(&pdev->dev))
|
|
enable_irq_wake(ei->chained_irq);
|
|
return 0;
|
|
}
|
|
|
|
static int egpio_resume(struct platform_device *pdev)
|
|
{
|
|
struct egpio_info *ei = platform_get_drvdata(pdev);
|
|
|
|
if (ei->chained_irq && device_may_wakeup(&pdev->dev))
|
|
disable_irq_wake(ei->chained_irq);
|
|
|
|
/* Update registers from the cache, in case
|
|
the CPLD was powered off during suspend */
|
|
egpio_write_cache(ei);
|
|
return 0;
|
|
}
|
|
#else
|
|
#define egpio_suspend NULL
|
|
#define egpio_resume NULL
|
|
#endif
|
|
|
|
|
|
static struct platform_driver egpio_driver = {
|
|
.driver = {
|
|
.name = "htc-egpio",
|
|
},
|
|
.remove = __exit_p(egpio_remove),
|
|
.suspend = egpio_suspend,
|
|
.resume = egpio_resume,
|
|
};
|
|
|
|
static int __init egpio_init(void)
|
|
{
|
|
return platform_driver_probe(&egpio_driver, egpio_probe);
|
|
}
|
|
|
|
static void __exit egpio_exit(void)
|
|
{
|
|
platform_driver_unregister(&egpio_driver);
|
|
}
|
|
|
|
/* start early for dependencies */
|
|
subsys_initcall(egpio_init);
|
|
module_exit(egpio_exit)
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Kevin O'Connor <kevin@koconnor.net>");
|