On Fri, Jul 20, 2012 at 04:24:38 PM, Benoît Thébaudeau wrote:
Add support for Freescale's i.MX DryIce RTC, present on i.MX25.
Signed-off-by: Benoît Thébaudeau benoit.thebaudeau@advansee.com Cc: Wolfgang Denk wd@denx.de Cc: Stefano Babic sbabic@denx.de
.../drivers/rtc/Makefile | 1 + /dev/null => u-boot-66714b1/drivers/rtc/imxdi.c | 224 ++++++++++++++++++++ 2 files changed, 225 insertions(+) create mode 100644 u-boot-66714b1/drivers/rtc/imxdi.c
diff --git u-boot-66714b1.orig/drivers/rtc/Makefile u-boot-66714b1/drivers/rtc/Makefile index faf4fcd..aeeea37 100644 --- u-boot-66714b1.orig/drivers/rtc/Makefile +++ u-boot-66714b1/drivers/rtc/Makefile @@ -43,6 +43,7 @@ COBJS-$(CONFIG_RTC_DS164x) += ds164x.o COBJS-$(CONFIG_RTC_DS174x) += ds174x.o COBJS-$(CONFIG_RTC_DS3231) += ds3231.o COBJS-$(CONFIG_RTC_FTRTC010) += ftrtc010.o +COBJS-$(CONFIG_RTC_IMXDI) += imxdi.o COBJS-$(CONFIG_RTC_ISL1208) += isl1208.o COBJS-$(CONFIG_RTC_M41T11) += m41t11.o COBJS-$(CONFIG_RTC_M41T60) += m41t60.o diff --git u-boot-66714b1/drivers/rtc/imxdi.c u-boot-66714b1/drivers/rtc/imxdi.c new file mode 100644 index 0000000..c2be842 --- /dev/null +++ u-boot-66714b1/drivers/rtc/imxdi.c @@ -0,0 +1,224 @@ +/*
- (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
- See file CREDITS for list of people who contributed to this
- project.
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2 of
- the License, or (at your option) any later version.
- This program is distributed in the hope that 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, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- MA 02111-1307 USA
- */
+/*
- Date & Time support for Freescale i.MX DryIce RTC
- */
+#include <common.h> +#include <command.h> +#include <rtc.h>
+#if defined(CONFIG_CMD_DATE)
+#include <asm/io.h> +#include <asm/arch/imx-regs.h>
+/* DryIce Register Definitions */
+#define DTCMR 0x00 /* Time Counter MSB Reg */ +#define DTCLR 0x04 /* Time Counter LSB Reg */
+#define DCAMR 0x08 /* Clock Alarm MSB Reg */ +#define DCALR 0x0c /* Clock Alarm LSB Reg */ +#define DCAMR_UNSET 0xFFFFFFFF /* doomsday - 1 sec */
+#define DCR 0x10 /* Control Reg */ +#define DCR_TCE (1 << 3) /* Time Counter Enable */
+#define DSR 0x14 /* Status Reg */ +#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 0x18 /* Interrupt Enable Reg */ +#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 */
+/*
- 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, IMX_DRYICE_BASE + DSR);
- /* wait for it to take effect */
- for (cnt = 0; cnt < 1000; cnt++) {
if ((__raw_readl(IMX_DRYICE_BASE + 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.
- This function uses interrupt flags to determine when the
- write has completed.
- */
+static int di_write_wait(u32 val, int reg) +{
- int cnt;
- int ret = 0;
- int rc = 0;
- /* do the register write */
- __raw_writel(val, IMX_DRYICE_BASE + reg);
- /* wait for the write to finish */
- for (cnt = 0; cnt < 100; cnt++) {
if ((__raw_readl(IMX_DRYICE_BASE + DSR) &(DSR_WCF | DSR_WEF)) != 0) {ret = 1;break;}udelay(10);- }
- if (ret == 0)
printf("### Warning: RTC - Write-wait timeout ""val = 0x%.8x reg = 0x%.8x\n", val, reg);- /* check for write error */
- if (__raw_readl(IMX_DRYICE_BASE + DSR) & DSR_WEF) {
clear_write_error();rc = -1;- }
- return rc;
+}
+/*
- Initialize dryice hardware
- */
+static int di_init(void) +{
- int rc = 0;
- /* mask all interrupts */
- __raw_writel(0, IMX_DRYICE_BASE + DIER);
- /* put dryice into valid state */
- if (__raw_readl(IMX_DRYICE_BASE + 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(IMX_DRYICE_BASE + 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(IMX_DRYICE_BASE + DTCMR) == 0) {
rc = di_write_wait(0, DTCMR);if (rc)goto err;- }
- /* start keeping time */
- if (!(__raw_readl(IMX_DRYICE_BASE + DCR) & DCR_TCE)) {
rc = di_write_wait(__raw_readl(IMX_DRYICE_BASE + DCR) | DCR_TCE,DCR);if (rc)goto err;- }
- return 0;
+err:
- return rc;
+}
+int rtc_get(struct rtc_time *tmp) +{
- unsigned long now;
- int rc;
- rc = di_init();
- if (rc)
goto err;- now = __raw_readl(IMX_DRYICE_BASE + DTCMR);
- to_tm(now, tmp);
+err:
- return rc;
+}
+int rtc_set(struct rtc_time *tmp) +{
- unsigned long now;
- int rc;
- 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
Ping?
Benoît