diff options
Diffstat (limited to 'arch/arm/mach-prima2/rstc.c')
-rw-r--r-- | arch/arm/mach-prima2/rstc.c | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/arch/arm/mach-prima2/rstc.c b/arch/arm/mach-prima2/rstc.c deleted file mode 100644 index 9d56606ac87f..000000000000 --- a/arch/arm/mach-prima2/rstc.c +++ /dev/null @@ -1,107 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * reset controller for CSR SiRFprimaII - * - * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. - */ - -#include <linux/kernel.h> -#include <linux/mutex.h> -#include <linux/io.h> -#include <linux/delay.h> -#include <linux/device.h> -#include <linux/of.h> -#include <linux/of_address.h> -#include <linux/platform_device.h> -#include <linux/reboot.h> -#include <linux/reset-controller.h> - -#include <asm/system_misc.h> - -#define SIRFSOC_RSTBIT_NUM 64 - -static void __iomem *sirfsoc_rstc_base; -static DEFINE_MUTEX(rstc_lock); - -static int sirfsoc_reset_module(struct reset_controller_dev *rcdev, - unsigned long sw_reset_idx) -{ - u32 reset_bit = sw_reset_idx; - - if (reset_bit >= SIRFSOC_RSTBIT_NUM) - return -EINVAL; - - mutex_lock(&rstc_lock); - - /* - * Writing 1 to this bit resets corresponding block. - * Writing 0 to this bit de-asserts reset signal of the - * corresponding block. datasheet doesn't require explicit - * delay between the set and clear of reset bit. it could - * be shorter if tests pass. - */ - writel(readl(sirfsoc_rstc_base + - (reset_bit / 32) * 4) | (1 << reset_bit), - sirfsoc_rstc_base + (reset_bit / 32) * 4); - msleep(20); - writel(readl(sirfsoc_rstc_base + - (reset_bit / 32) * 4) & ~(1 << reset_bit), - sirfsoc_rstc_base + (reset_bit / 32) * 4); - - mutex_unlock(&rstc_lock); - - return 0; -} - -static struct reset_control_ops sirfsoc_rstc_ops = { - .reset = sirfsoc_reset_module, -}; - -static struct reset_controller_dev sirfsoc_reset_controller = { - .ops = &sirfsoc_rstc_ops, - .nr_resets = SIRFSOC_RSTBIT_NUM, -}; - -#define SIRFSOC_SYS_RST_BIT BIT(31) - -static void sirfsoc_restart(enum reboot_mode mode, const char *cmd) -{ - writel(SIRFSOC_SYS_RST_BIT, sirfsoc_rstc_base); -} - -static int sirfsoc_rstc_probe(struct platform_device *pdev) -{ - struct device_node *np = pdev->dev.of_node; - sirfsoc_rstc_base = of_iomap(np, 0); - if (!sirfsoc_rstc_base) { - dev_err(&pdev->dev, "unable to map rstc cpu registers\n"); - return -ENOMEM; - } - - sirfsoc_reset_controller.of_node = np; - arm_pm_restart = sirfsoc_restart; - - if (IS_ENABLED(CONFIG_RESET_CONTROLLER)) - reset_controller_register(&sirfsoc_reset_controller); - - return 0; -} - -static const struct of_device_id rstc_ids[] = { - { .compatible = "sirf,prima2-rstc" }, - {}, -}; - -static struct platform_driver sirfsoc_rstc_driver = { - .probe = sirfsoc_rstc_probe, - .driver = { - .name = "sirfsoc_rstc", - .of_match_table = rstc_ids, - }, -}; - -static int __init sirfsoc_rstc_init(void) -{ - return platform_driver_register(&sirfsoc_rstc_driver); -} -subsys_initcall(sirfsoc_rstc_init); |