1 // SPDX-License-Identifier: GPL-2.0+
3  * (C) Copyright 2009-2012 ADVANSEE
6  * Based on the Linux rtc-imxdi.c driver, which is:
7  * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
21 #include <asm/arch/imx-regs.h>
35 #define DCAMR_UNSET	0xFFFFFFFF	/* doomsday - 1 sec */
39 #define DSR_WBF		(1 << 10)	/* Write Busy Flag */
40 #define DSR_WNF		(1 << 9)	/* Write Next Flag */
41 #define DSR_WCF		(1 << 8)	/* Write Complete Flag */
42 #define DSR_WEF		(1 << 7)	/* Write Error Flag */
44 #define DSR_NVF		(1 << 1)	/* Non-Valid Flag */
47 #define DIER_WNIE	(1 << 9)	/* Write Next Interrupt Enable */
48 #define DIER_WCIE	(1 << 8)	/* Write Complete Interrupt Enable */
49 #define DIER_WEIE	(1 << 7)	/* Write Error Interrupt Enable */
52 /* Driver Private Data */
59 static struct imxdi_data data;  variable
62  * This function attempts to clear the dryice write-error flag.
64  * A dryice write error is similar to a bus fault and should not occur in
65  * normal operation.  Clearing the flag requires another write, so the root
72 	puts("### Warning: RTC - Register write error!\n");  in clear_write_error()
74 	/* clear the write error flag */  in clear_write_error()
75 	__raw_writel(DSR_WEF, &data.regs->dsr);  in clear_write_error()
79 		if ((__raw_readl(&data.regs->dsr) & DSR_WEF) == 0)  in clear_write_error()
83 	puts("### Error: RTC - Cannot clear write-error flag!\n");  in clear_write_error()
87  * Write a dryice register and wait until it completes.
89  * Use interrupt flags to determine when the write has completed.
93 	/* do the register write */					\
94 	__raw_writel((val), &data.regs->reg),				\
104 	/* wait for the write to finish */  in di_write_wait()
106 		if ((__raw_readl(&data.regs->dsr) & (DSR_WCF | DSR_WEF)) != 0) {  in di_write_wait()
113 		printf("### Warning: RTC - Write-wait timeout "  in di_write_wait()
116 	/* check for write error */  in di_write_wait()
117 	if (__raw_readl(&data.regs->dsr) & DSR_WEF) {  in di_write_wait()
119 		rc = -1;  in di_write_wait()
132 	data.regs = (struct imxdi_regs __iomem *)IMX_DRYICE_BASE;  in di_init()
135 	__raw_writel(0, &data.regs->dier);  in di_init()
138 	if (__raw_readl(&data.regs->dsr) & DSR_NVF) {  in di_init()
153 	if (__raw_readl(&data.regs->dsr) & DSR_CAF) {  in di_init()
160 	if (__raw_readl(&data.regs->dtcmr) == 0) {  in di_init()
167 	if (!(__raw_readl(&data.regs->dcr) & DCR_TCE)) {  in di_init()
168 		rc = DI_WRITE_WAIT(__raw_readl(&data.regs->dcr) | DCR_TCE, dcr);  in di_init()
173 	data.init_done = 1;  in di_init()
185 	if (!data.init_done) {  in rtc_get()
191 	now = __raw_readl(&data.regs->dtcmr);  in rtc_get()
203 	if (!data.init_done) {  in rtc_set()