/* * TI Palma series PMIC's GPIO driver. * * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. * * Author: Laxman Dewangan * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include #include #include #include struct palmas_gpio { struct gpio_chip gpio_chip; struct palmas *palmas; }; struct palmas_device_data { int ngpio; }; static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset) { struct palmas_gpio *pg = gpiochip_get_data(gc); struct palmas *palmas = pg->palmas; unsigned int val; int ret; unsigned int reg; int gpio16 = (offset/8); offset %= 8; reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR; ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val); if (ret < 0) { dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret); return ret; } if (val & BIT(offset)) reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT; else reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN; ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val); if (ret < 0) { dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret); return ret; } return !!(val & BIT(offset)); } static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset, int value) { struct palmas_gpio *pg = gpiochip_get_data(gc); struct palmas *palmas = pg->palmas; int ret; unsigned int reg; int gpio16 = (offset/8); offset %= 8; if (gpio16) reg = (value) ? PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2; else reg = (value) ? PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT; ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset)); if (ret < 0) dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret); } static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset, int value) { struct palmas_gpio *pg = gpiochip_get_data(gc); struct palmas *palmas = pg->palmas; int ret; unsigned int reg; int gpio16 = (offset/8); offset %= 8; reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR; /* Set the initial value */ palmas_gpio_set(gc, offset, value); ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), BIT(offset)); if (ret < 0) dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg, ret); return ret; } static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset) { struct palmas_gpio *pg = gpiochip_get_data(gc); struct palmas *palmas = pg->palmas; int ret; unsigned int reg; int gpio16 = (offset/8); offset %= 8; reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR; ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0); if (ret < 0) dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg, ret); return ret; } static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset) { struct palmas_gpio *pg = gpiochip_get_data(gc); struct palmas *palmas = pg->palmas; return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset); } static const struct palmas_device_data palmas_dev_data = { .ngpio = 8, }; static const struct palmas_device_data tps80036_dev_data = { .ngpio = 16, }; static const struct of_device_id of_palmas_gpio_match[] = { { .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,}, { .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,}, { .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,}, { .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,}, { }, }; MODULE_DEVICE_TABLE(of, of_palmas_gpio_match); static int palmas_gpio_probe(struct platform_device *pdev) { struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); struct palmas_platform_data *palmas_pdata; struct palmas_gpio *palmas_gpio; int ret; const struct of_device_id *match; const struct palmas_device_data *dev_data; match = of_match_device(of_palmas_gpio_match, &pdev->dev); if (!match) return -ENODEV; dev_data = match->data; if (!dev_data) dev_data = &palmas_dev_data; palmas_gpio = devm_kzalloc(&pdev->dev, sizeof(*palmas_gpio), GFP_KERNEL); if (!palmas_gpio) return -ENOMEM; palmas_gpio->palmas = palmas; palmas_gpio->gpio_chip.owner = THIS_MODULE; palmas_gpio->gpio_chip.label = dev_name(&pdev->dev); palmas_gpio->gpio_chip.ngpio = dev_data->ngpio; palmas_gpio->gpio_chip.can_sleep = true; palmas_gpio->gpio_chip.direction_input = palmas_gpio_input; palmas_gpio->gpio_chip.direction_output = palmas_gpio_output; palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq; palmas_gpio->gpio_chip.set = palmas_gpio_set; palmas_gpio->gpio_chip.get = palmas_gpio_get; palmas_gpio->gpio_chip.parent = &pdev->dev; #ifdef CONFIG_OF_GPIO palmas_gpio->gpio_chip.of_node = pdev->dev.of_node; #endif palmas_pdata = dev_get_platdata(palmas->dev); if (palmas_pdata && palmas_pdata->gpio_base) palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base; else palmas_gpio->gpio_chip.base = -1; ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip, palmas_gpio); if (ret < 0) { dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); return ret; } platform_set_drvdata(pdev, palmas_gpio); return ret; } static struct platform_driver palmas_gpio_driver = { .driver.name = "palmas-gpio", .driver.of_match_table = of_palmas_gpio_match, .probe = palmas_gpio_probe, }; static int __init palmas_gpio_init(void) { return platform_driver_register(&palmas_gpio_driver); } subsys_initcall(palmas_gpio_init); tServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/perf/tests/attr.c')