diff options
Diffstat (limited to 'arch/arm/mach-prima2/rtciobrg.c')
| -rw-r--r-- | arch/arm/mach-prima2/rtciobrg.c | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/arch/arm/mach-prima2/rtciobrg.c b/arch/arm/mach-prima2/rtciobrg.c deleted file mode 100644 index 97c0e333e3b9..000000000000 --- a/arch/arm/mach-prima2/rtciobrg.c +++ /dev/null @@ -1,179 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * RTC I/O Bridge interfaces for CSR SiRFprimaII/atlas7 - * ARM access the registers of SYSRTC, GPSRTC and PWRC through this module - * - * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/io.h> -#include <linux/regmap.h> -#include <linux/of.h> -#include <linux/of_address.h> -#include <linux/of_device.h> -#include <linux/of_platform.h> - -#define SIRFSOC_CPUIOBRG_CTRL 0x00 -#define SIRFSOC_CPUIOBRG_WRBE 0x04 -#define SIRFSOC_CPUIOBRG_ADDR 0x08 -#define SIRFSOC_CPUIOBRG_DATA 0x0c - -/* - * suspend asm codes will access this address to make system deepsleep - * after DRAM becomes self-refresh - */ -void __iomem *sirfsoc_rtciobrg_base; -static DEFINE_SPINLOCK(rtciobrg_lock); - -/* - * symbols without lock are only used by suspend asm codes - * and these symbols are not exported too - */ -void sirfsoc_rtc_iobrg_wait_sync(void) -{ - while (readl_relaxed(sirfsoc_rtciobrg_base + SIRFSOC_CPUIOBRG_CTRL)) - cpu_relax(); -} - -void sirfsoc_rtc_iobrg_besyncing(void) -{ - unsigned long flags; - - spin_lock_irqsave(&rtciobrg_lock, flags); - - sirfsoc_rtc_iobrg_wait_sync(); - - spin_unlock_irqrestore(&rtciobrg_lock, flags); -} -EXPORT_SYMBOL_GPL(sirfsoc_rtc_iobrg_besyncing); - -u32 __sirfsoc_rtc_iobrg_readl(u32 addr) -{ - sirfsoc_rtc_iobrg_wait_sync(); - - writel_relaxed(0x00, sirfsoc_rtciobrg_base + SIRFSOC_CPUIOBRG_WRBE); - writel_relaxed(addr, sirfsoc_rtciobrg_base + SIRFSOC_CPUIOBRG_ADDR); - writel_relaxed(0x01, sirfsoc_rtciobrg_base + SIRFSOC_CPUIOBRG_CTRL); - - sirfsoc_rtc_iobrg_wait_sync(); - - return readl_relaxed(sirfsoc_rtciobrg_base + SIRFSOC_CPUIOBRG_DATA); -} - -u32 sirfsoc_rtc_iobrg_readl(u32 addr) -{ - unsigned long flags, val; - - /* TODO: add hwspinlock to sync with M3 */ - spin_lock_irqsave(&rtciobrg_lock, flags); - - val = __sirfsoc_rtc_iobrg_readl(addr); - - spin_unlock_irqrestore(&rtciobrg_lock, flags); - - return val; -} -EXPORT_SYMBOL_GPL(sirfsoc_rtc_iobrg_readl); - -void sirfsoc_rtc_iobrg_pre_writel(u32 val, u32 addr) -{ - sirfsoc_rtc_iobrg_wait_sync(); - - writel_relaxed(0xf1, sirfsoc_rtciobrg_base + SIRFSOC_CPUIOBRG_WRBE); - writel_relaxed(addr, sirfsoc_rtciobrg_base + SIRFSOC_CPUIOBRG_ADDR); - - writel_relaxed(val, sirfsoc_rtciobrg_base + SIRFSOC_CPUIOBRG_DATA); -} - -void sirfsoc_rtc_iobrg_writel(u32 val, u32 addr) -{ - unsigned long flags; - - /* TODO: add hwspinlock to sync with M3 */ - spin_lock_irqsave(&rtciobrg_lock, flags); - - sirfsoc_rtc_iobrg_pre_writel(val, addr); - - writel_relaxed(0x01, sirfsoc_rtciobrg_base + SIRFSOC_CPUIOBRG_CTRL); - - sirfsoc_rtc_iobrg_wait_sync(); - - spin_unlock_irqrestore(&rtciobrg_lock, flags); -} -EXPORT_SYMBOL_GPL(sirfsoc_rtc_iobrg_writel); - - -static int regmap_iobg_regwrite(void *context, unsigned int reg, - unsigned int val) -{ - sirfsoc_rtc_iobrg_writel(val, reg); - return 0; -} - -static int regmap_iobg_regread(void *context, unsigned int reg, - unsigned int *val) -{ - *val = (u32)sirfsoc_rtc_iobrg_readl(reg); - return 0; -} - -static struct regmap_bus regmap_iobg = { - .reg_write = regmap_iobg_regwrite, - .reg_read = regmap_iobg_regread, -}; - -/** - * devm_regmap_init_iobg(): Initialise managed register map - * - * @iobg: Device that will be interacted with - * @config: Configuration for register map - * - * The return value will be an ERR_PTR() on error or a valid pointer - * to a struct regmap. The regmap will be automatically freed by the - * device management code. - */ -struct regmap *devm_regmap_init_iobg(struct device *dev, - const struct regmap_config *config) -{ - const struct regmap_bus *bus = ®map_iobg; - - return devm_regmap_init(dev, bus, dev, config); -} -EXPORT_SYMBOL_GPL(devm_regmap_init_iobg); - -static const struct of_device_id rtciobrg_ids[] = { - { .compatible = "sirf,prima2-rtciobg" }, - {} -}; - -static int sirfsoc_rtciobrg_probe(struct platform_device *op) -{ - struct device_node *np = op->dev.of_node; - - sirfsoc_rtciobrg_base = of_iomap(np, 0); - if (!sirfsoc_rtciobrg_base) - panic("unable to map rtc iobrg registers\n"); - - return 0; -} - -static struct platform_driver sirfsoc_rtciobrg_driver = { - .probe = sirfsoc_rtciobrg_probe, - .driver = { - .name = "sirfsoc-rtciobrg", - .of_match_table = rtciobrg_ids, - }, -}; - -static int __init sirfsoc_rtciobrg_init(void) -{ - return platform_driver_register(&sirfsoc_rtciobrg_driver); -} -postcore_initcall(sirfsoc_rtciobrg_init); - -MODULE_AUTHOR("Zhiwu Song <zhiwu.song@csr.com>"); -MODULE_AUTHOR("Barry Song <baohua.song@csr.com>"); -MODULE_DESCRIPTION("CSR SiRFprimaII rtc io bridge"); -MODULE_LICENSE("GPL v2"); |