diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/rtc/imxdi.c')
| -rw-r--r-- | qemu/roms/u-boot/drivers/rtc/imxdi.c | 228 |
1 files changed, 0 insertions, 228 deletions
diff --git a/qemu/roms/u-boot/drivers/rtc/imxdi.c b/qemu/roms/u-boot/drivers/rtc/imxdi.c deleted file mode 100644 index 0d7d736ef..000000000 --- a/qemu/roms/u-boot/drivers/rtc/imxdi.c +++ /dev/null @@ -1,228 +0,0 @@ -/* - * (C) Copyright 2009-2012 ADVANSEE - * Benoît Thébaudeau <benoit.thebaudeau@advansee.com> - * - * Based on the Linux rtc-imxdi.c driver, which is: - * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved. - * Copyright 2010 Orex Computed Radiography - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -/* - * Date & Time support for Freescale i.MX DryIce RTC - */ - -#include <common.h> -#include <command.h> -#include <linux/compat.h> -#include <rtc.h> - -#if defined(CONFIG_CMD_DATE) - -#include <asm/io.h> -#include <asm/arch/imx-regs.h> - -/* DryIce Register Definitions */ - -struct imxdi_regs { - u32 dtcmr; /* Time Counter MSB Reg */ - u32 dtclr; /* Time Counter LSB Reg */ - u32 dcamr; /* Clock Alarm MSB Reg */ - u32 dcalr; /* Clock Alarm LSB Reg */ - u32 dcr; /* Control Reg */ - u32 dsr; /* Status Reg */ - u32 dier; /* Interrupt Enable Reg */ -}; - -#define DCAMR_UNSET 0xFFFFFFFF /* doomsday - 1 sec */ - -#define DCR_TCE (1 << 3) /* Time Counter Enable */ - -#define DSR_WBF (1 << 10) /* Write Busy Flag */ -#define DSR_WNF (1 << 9) /* Write Next Flag */ -#define DSR_WCF (1 << 8) /* Write Complete Flag */ -#define DSR_WEF (1 << 7) /* Write Error Flag */ -#define DSR_CAF (1 << 4) /* Clock Alarm Flag */ -#define DSR_NVF (1 << 1) /* Non-Valid Flag */ -#define DSR_SVF (1 << 0) /* Security Violation Flag */ - -#define DIER_WNIE (1 << 9) /* Write Next Interrupt Enable */ -#define DIER_WCIE (1 << 8) /* Write Complete Interrupt Enable */ -#define DIER_WEIE (1 << 7) /* Write Error Interrupt Enable */ -#define DIER_CAIE (1 << 4) /* Clock Alarm Interrupt Enable */ - -/* Driver Private Data */ - -struct imxdi_data { - struct imxdi_regs __iomem *regs; - int init_done; -}; - -static struct imxdi_data data; - -/* - * This function attempts to clear the dryice write-error flag. - * - * A dryice write error is similar to a bus fault and should not occur in - * normal operation. Clearing the flag requires another write, so the root - * cause of the problem may need to be fixed before the flag can be cleared. - */ -static void clear_write_error(void) -{ - int cnt; - - puts("### Warning: RTC - Register write error!\n"); - - /* clear the write error flag */ - __raw_writel(DSR_WEF, &data.regs->dsr); - - /* wait for it to take effect */ - for (cnt = 0; cnt < 1000; cnt++) { - if ((__raw_readl(&data.regs->dsr) & DSR_WEF) == 0) - return; - udelay(10); - } - puts("### Error: RTC - Cannot clear write-error flag!\n"); -} - -/* - * Write a dryice register and wait until it completes. - * - * Use interrupt flags to determine when the write has completed. - */ -#define DI_WRITE_WAIT(val, reg) \ -( \ - /* do the register write */ \ - __raw_writel((val), &data.regs->reg), \ - \ - di_write_wait((val), #reg) \ -) -static int di_write_wait(u32 val, const char *reg) -{ - int cnt; - int ret = 0; - int rc = 0; - - /* wait for the write to finish */ - for (cnt = 0; cnt < 100; cnt++) { - if ((__raw_readl(&data.regs->dsr) & (DSR_WCF | DSR_WEF)) != 0) { - ret = 1; - break; - } - udelay(10); - } - if (ret == 0) - printf("### Warning: RTC - Write-wait timeout " - "val = 0x%.8x reg = %s\n", val, reg); - - /* check for write error */ - if (__raw_readl(&data.regs->dsr) & DSR_WEF) { - clear_write_error(); - rc = -1; - } - - return rc; -} - -/* - * Initialize dryice hardware - */ -static int di_init(void) -{ - int rc = 0; - - data.regs = (struct imxdi_regs __iomem *)IMX_DRYICE_BASE; - - /* mask all interrupts */ - __raw_writel(0, &data.regs->dier); - - /* put dryice into valid state */ - if (__raw_readl(&data.regs->dsr) & DSR_NVF) { - rc = DI_WRITE_WAIT(DSR_NVF | DSR_SVF, dsr); - if (rc) - goto err; - } - - /* initialize alarm */ - rc = DI_WRITE_WAIT(DCAMR_UNSET, dcamr); - if (rc) - goto err; - rc = DI_WRITE_WAIT(0, dcalr); - if (rc) - goto err; - - /* clear alarm flag */ - if (__raw_readl(&data.regs->dsr) & DSR_CAF) { - rc = DI_WRITE_WAIT(DSR_CAF, dsr); - if (rc) - goto err; - } - - /* the timer won't count if it has never been written to */ - if (__raw_readl(&data.regs->dtcmr) == 0) { - rc = DI_WRITE_WAIT(0, dtcmr); - if (rc) - goto err; - } - - /* start keeping time */ - if (!(__raw_readl(&data.regs->dcr) & DCR_TCE)) { - rc = DI_WRITE_WAIT(__raw_readl(&data.regs->dcr) | DCR_TCE, dcr); - if (rc) - goto err; - } - - data.init_done = 1; - return 0; - -err: - return rc; -} - -int rtc_get(struct rtc_time *tmp) -{ - unsigned long now; - int rc = 0; - - if (!data.init_done) { - rc = di_init(); - if (rc) - goto err; - } - - now = __raw_readl(&data.regs->dtcmr); - to_tm(now, tmp); - -err: - return rc; -} - -int rtc_set(struct rtc_time *tmp) -{ - unsigned long now; - int rc; - - if (!data.init_done) { - rc = di_init(); - if (rc) - goto err; - } - - now = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, - tmp->tm_hour, tmp->tm_min, tmp->tm_sec); - /* zero the fractional part first */ - rc = DI_WRITE_WAIT(0, dtclr); - if (rc == 0) - rc = DI_WRITE_WAIT(now, dtcmr); - -err: - return rc; -} - -void rtc_reset(void) -{ - di_init(); -} - -#endif |