+// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2011 DENX Software Engineering GmbH
- *
- * 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
*/
-#include <common.h>
#include <command.h>
+#include <dm.h>
+#include <clk.h>
+#include <log.h>
#include <rtc.h>
#include <asm/io.h>
-#include <asm/arch/hardware.h>
-
-#if defined(CONFIG_CMD_DATE)
-struct davinci_rtc {
- u_int32_t second;
- u_int32_t minutes;
- u_int32_t hours;
- u_int32_t day;
- u_int32_t month; /* 0x10 */
- u_int32_t year;
- u_int32_t dotw;
- u_int32_t resv1;
- u_int32_t alarmsecond; /* 0x20 */
- u_int32_t alarmminute;
- u_int32_t alarmhour;
- u_int32_t alarmday;
- u_int32_t alarmmonth; /* 0x30 */
- u_int32_t alarmyear;
- u_int32_t resv2[2];
- u_int32_t ctrl; /* 0x40 */
- u_int32_t status;
- u_int32_t irq;
+#include <dm/device_compat.h>
+#include <linux/delay.h>
+
+/* RTC registers */
+#define OMAP_RTC_SECONDS_REG 0x00
+#define OMAP_RTC_MINUTES_REG 0x04
+#define OMAP_RTC_HOURS_REG 0x08
+#define OMAP_RTC_DAYS_REG 0x0C
+#define OMAP_RTC_MONTHS_REG 0x10
+#define OMAP_RTC_YEARS_REG 0x14
+#define OMAP_RTC_WEEKS_REG 0x18
+
+#define OMAP_RTC_CTRL_REG 0x40
+#define OMAP_RTC_STATUS_REG 0x44
+#define OMAP_RTC_INTERRUPTS_REG 0x48
+
+#define OMAP_RTC_OSC_REG 0x54
+
+#define OMAP_RTC_SCRATCH0_REG 0x60
+#define OMAP_RTC_SCRATCH1_REG 0x64
+#define OMAP_RTC_SCRATCH2_REG 0x68
+
+#define OMAP_RTC_KICK0_REG 0x6c
+#define OMAP_RTC_KICK1_REG 0x70
+
+#define OMAP_RTC_PMIC_REG 0x98
+
+/* OMAP_RTC_CTRL_REG bit fields: */
+#define OMAP_RTC_CTRL_SPLIT BIT(7)
+#define OMAP_RTC_CTRL_DISABLE BIT(6)
+#define OMAP_RTC_CTRL_SET_32_COUNTER BIT(5)
+#define OMAP_RTC_CTRL_TEST BIT(4)
+#define OMAP_RTC_CTRL_MODE_12_24 BIT(3)
+#define OMAP_RTC_CTRL_AUTO_COMP BIT(2)
+#define OMAP_RTC_CTRL_ROUND_30S BIT(1)
+#define OMAP_RTC_CTRL_STOP BIT(0)
+
+/* OMAP_RTC_STATUS_REG bit fields */
+#define OMAP_RTC_STATUS_POWER_UP BIT(7)
+#define OMAP_RTC_STATUS_ALARM2 BIT(7)
+#define OMAP_RTC_STATUS_ALARM BIT(6)
+#define OMAP_RTC_STATUS_1D_EVENT BIT(5)
+#define OMAP_RTC_STATUS_1H_EVENT BIT(4)
+#define OMAP_RTC_STATUS_1M_EVENT BIT(3)
+#define OMAP_RTC_STATUS_1S_EVENT BIT(2)
+#define OMAP_RTC_STATUS_RUN BIT(1)
+#define OMAP_RTC_STATUS_BUSY BIT(0)
+
+/* OMAP_RTC_OSC_REG bit fields */
+#define OMAP_RTC_OSC_32KCLK_EN BIT(6)
+#define OMAP_RTC_OSC_SEL_32KCLK_SRC BIT(3)
+#define OMAP_RTC_OSC_OSC32K_GZ_DISABLE BIT(4)
+
+/* OMAP_RTC_KICKER values */
+#define OMAP_RTC_KICK0_VALUE 0x83e70b13
+#define OMAP_RTC_KICK1_VALUE 0x95a4f1e0
+
+struct omap_rtc_device_type {
+ bool has_32kclk_en;
+ bool has_irqwakeen;
+ bool has_pmic_mode;
+ bool has_power_up_reset;
};
-#define RTC_STATE_BUSY 0x01
-#define RTC_STATE_RUN 0x02
+struct omap_rtc_priv {
+ fdt_addr_t base;
+ u8 max_reg;
+ struct udevice *dev;
+ struct clk clk;
+ bool has_ext_clk;
+ const struct omap_rtc_device_type *type;
+};
-#define davinci_rtc_base ((struct davinci_rtc *)DAVINCI_RTC_BASE)
+static inline u8 omap_rtc_readb(struct omap_rtc_priv *priv, unsigned int reg)
+{
+ return readb(priv->base + reg);
+}
-int rtc_get(struct rtc_time *tmp)
+static inline u32 omap_rtc_readl(struct omap_rtc_priv *priv, unsigned int reg)
{
- struct davinci_rtc *rtc = davinci_rtc_base;
- unsigned long sec, min, hour, mday, wday, mon_cent, year;
- unsigned long status;
+ return readl(priv->base + reg);
+}
- status = readl(&rtc->status);
- if ((status & RTC_STATE_RUN) != RTC_STATE_RUN) {
+static inline void omap_rtc_writeb(struct omap_rtc_priv *priv, unsigned int reg,
+ u8 val)
+{
+ writeb(val, priv->base + reg);
+}
+
+static inline void omap_rtc_writel(struct omap_rtc_priv *priv, unsigned int reg,
+ u32 val)
+{
+ writel(val, priv->base + reg);
+}
+
+static inline void omap_rtc_unlock(struct omap_rtc_priv *priv)
+{
+ omap_rtc_writel(priv, OMAP_RTC_KICK0_REG, OMAP_RTC_KICK0_VALUE);
+ omap_rtc_writel(priv, OMAP_RTC_KICK1_REG, OMAP_RTC_KICK1_VALUE);
+}
+
+static inline void omap_rtc_lock(struct omap_rtc_priv *priv)
+{
+ omap_rtc_writel(priv, OMAP_RTC_KICK0_REG, 0);
+ omap_rtc_writel(priv, OMAP_RTC_KICK1_REG, 0);
+}
+
+static int omap_rtc_wait_not_busy(struct omap_rtc_priv *priv)
+{
+ int count;
+ u8 status;
+
+ status = omap_rtc_readb(priv, OMAP_RTC_STATUS_REG);
+ if ((status & OMAP_RTC_STATUS_RUN) != OMAP_RTC_STATUS_RUN) {
printf("RTC doesn't run\n");
return -1;
}
- if ((status & RTC_STATE_BUSY) == RTC_STATE_BUSY)
- udelay(20);
-
- sec = readl(&rtc->second);
- min = readl(&rtc->minutes);
- hour = readl(&rtc->hours);
- mday = readl(&rtc->day);
- wday = readl(&rtc->dotw);
- mon_cent = readl(&rtc->month);
- year = readl(&rtc->year);
-
- debug("Get RTC year: %02lx mon/cent: %02lx mday: %02lx wday: %02lx "
+
+ /* BUSY may stay active for 1/32768 second (~30 usec) */
+ for (count = 0; count < 50; count++) {
+ if (!(status & OMAP_RTC_STATUS_BUSY))
+ break;
+
+ udelay(1);
+ status = omap_rtc_readb(priv, OMAP_RTC_STATUS_REG);
+ }
+
+ /* now we have ~15 usec to read/write various registers */
+ return 0;
+}
+
+static int omap_rtc_reset(struct udevice *dev)
+{
+ struct omap_rtc_priv *priv = dev_get_priv(dev);
+
+ /* run RTC counter */
+ omap_rtc_writeb(priv, OMAP_RTC_CTRL_REG, 0x01);
+ return 0;
+}
+
+static int omap_rtc_set(struct udevice *dev, const struct rtc_time *tm)
+{
+ struct omap_rtc_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ ret = omap_rtc_wait_not_busy(priv);
+ if (ret)
+ return ret;
+
+ omap_rtc_unlock(priv);
+ omap_rtc_writeb(priv, OMAP_RTC_YEARS_REG, bin2bcd(tm->tm_year % 100));
+ omap_rtc_writeb(priv, OMAP_RTC_MONTHS_REG, bin2bcd(tm->tm_mon));
+ omap_rtc_writeb(priv, OMAP_RTC_WEEKS_REG, bin2bcd(tm->tm_wday));
+ omap_rtc_writeb(priv, OMAP_RTC_DAYS_REG, bin2bcd(tm->tm_mday));
+ omap_rtc_writeb(priv, OMAP_RTC_HOURS_REG, bin2bcd(tm->tm_hour));
+ omap_rtc_writeb(priv, OMAP_RTC_MINUTES_REG, bin2bcd(tm->tm_min));
+ omap_rtc_writeb(priv, OMAP_RTC_SECONDS_REG, bin2bcd(tm->tm_sec));
+ omap_rtc_lock(priv);
+
+ dev_dbg(dev, "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
+ tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour,
+ tm->tm_min, tm->tm_sec);
+
+ return 0;
+}
+
+static int omap_rtc_get(struct udevice *dev, struct rtc_time *tm)
+{
+ struct omap_rtc_priv *priv = dev_get_priv(dev);
+ unsigned long sec, min, hour, mday, wday, mon_cent, year;
+ int ret;
+
+ ret = omap_rtc_wait_not_busy(priv);
+ if (ret)
+ return ret;
+
+ sec = omap_rtc_readb(priv, OMAP_RTC_SECONDS_REG);
+ min = omap_rtc_readb(priv, OMAP_RTC_MINUTES_REG);
+ hour = omap_rtc_readb(priv, OMAP_RTC_HOURS_REG);
+ mday = omap_rtc_readb(priv, OMAP_RTC_DAYS_REG);
+ wday = omap_rtc_readb(priv, OMAP_RTC_WEEKS_REG);
+ mon_cent = omap_rtc_readb(priv, OMAP_RTC_MONTHS_REG);
+ year = omap_rtc_readb(priv, OMAP_RTC_YEARS_REG);
+
+ dev_dbg(dev,
+ "Get RTC year: %02lx mon/cent: %02lx mday: %02lx wday: %02lx "
"hr: %02lx min: %02lx sec: %02lx\n",
year, mon_cent, mday, wday,
hour, min, sec);
- tmp->tm_sec = bcd2bin(sec & 0x7F);
- tmp->tm_min = bcd2bin(min & 0x7F);
- tmp->tm_hour = bcd2bin(hour & 0x3F);
- tmp->tm_mday = bcd2bin(mday & 0x3F);
- tmp->tm_mon = bcd2bin(mon_cent & 0x1F);
- tmp->tm_year = bcd2bin(year) + 2000;
- tmp->tm_wday = bcd2bin(wday & 0x07);
- tmp->tm_yday = 0;
- tmp->tm_isdst = 0;
+ tm->tm_sec = bcd2bin(sec & 0x7F);
+ tm->tm_min = bcd2bin(min & 0x7F);
+ tm->tm_hour = bcd2bin(hour & 0x3F);
+ tm->tm_mday = bcd2bin(mday & 0x3F);
+ tm->tm_mon = bcd2bin(mon_cent & 0x1F);
+ tm->tm_year = bcd2bin(year) + 2000;
+ tm->tm_wday = bcd2bin(wday & 0x07);
+ tm->tm_yday = 0;
+ tm->tm_isdst = 0;
+
+ dev_dbg(dev, "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
+ tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour,
+ tm->tm_min, tm->tm_sec);
+
+ return 0;
+}
+
+static int omap_rtc_scratch_read(struct udevice *dev, uint offset,
+ u8 *buffer, uint len)
+{
+ struct omap_rtc_priv *priv = dev_get_priv(dev);
+ u32 *val = (u32 *)buffer;
+ unsigned int reg;
+ int i;
+
+ if (len & 3)
+ return -EFAULT;
- debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
- tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
- tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+ for (i = 0; i < len / 4; i++) {
+ reg = OMAP_RTC_SCRATCH0_REG + offset + (i * 4);
+ if (reg >= OMAP_RTC_KICK0_REG)
+ return -EFAULT;
+
+ val[i] = omap_rtc_readl(priv, reg);
+ }
return 0;
}
-int rtc_set(struct rtc_time *tmp)
+static int omap_rtc_scratch_write(struct udevice *dev, uint offset,
+ const u8 *buffer, uint len)
{
- struct davinci_rtc *rtc = davinci_rtc_base;
-
- debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
- tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
- tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
- writel(bin2bcd(tmp->tm_year % 100), &rtc->year);
- writel(bin2bcd(tmp->tm_mon), &rtc->month);
-
- writel(bin2bcd(tmp->tm_wday), &rtc->dotw);
- writel(bin2bcd(tmp->tm_mday), &rtc->day);
- writel(bin2bcd(tmp->tm_hour), &rtc->hours);
- writel(bin2bcd(tmp->tm_min), &rtc->minutes);
- writel(bin2bcd(tmp->tm_sec), &rtc->second);
+ struct omap_rtc_priv *priv = dev_get_priv(dev);
+ u32 *val = (u32 *)buffer;
+ unsigned int reg;
+ int i;
+
+ if (len & 3)
+ return -EFAULT;
+
+ omap_rtc_unlock(priv);
+ for (i = 0; i < len / 4; i++) {
+ reg = OMAP_RTC_SCRATCH0_REG + offset + (i * 4);
+ if (reg >= OMAP_RTC_KICK0_REG)
+ return -EFAULT;
+
+ omap_rtc_writel(priv, reg, val[i]);
+ }
+ omap_rtc_lock(priv);
+
return 0;
}
-void rtc_reset(void)
+static int omap_rtc_remove(struct udevice *dev)
{
- struct davinci_rtc *rtc = davinci_rtc_base;
+ struct omap_rtc_priv *priv = dev_get_priv(dev);
+ u8 reg;
- /* run RTC counter */
- writel(0x01, &rtc->ctrl);
+ if (priv->clk.dev)
+ clk_disable(&priv->clk);
+
+ omap_rtc_unlock(priv);
+
+ /* leave rtc running, but disable irqs */
+ omap_rtc_writeb(priv, OMAP_RTC_INTERRUPTS_REG, 0);
+
+ if (priv->has_ext_clk) {
+ reg = omap_rtc_readb(priv, OMAP_RTC_OSC_REG);
+ reg &= ~OMAP_RTC_OSC_SEL_32KCLK_SRC;
+ omap_rtc_writeb(priv, OMAP_RTC_OSC_REG, reg);
+ }
+
+ omap_rtc_lock(priv);
+ return 0;
}
-#endif
+
+static int omap_rtc_probe(struct udevice *dev)
+{
+ struct omap_rtc_priv *priv = dev_get_priv(dev);
+ struct rtc_time tm;
+ u8 reg, mask, new_ctrl;
+
+ priv->dev = dev;
+ priv->type = (struct omap_rtc_device_type *)dev_get_driver_data(dev);
+ priv->max_reg = OMAP_RTC_PMIC_REG;
+
+ if (!clk_get_by_name(dev, "ext-clk", &priv->clk))
+ priv->has_ext_clk = true;
+ else
+ clk_get_by_name(dev, "int-clk", &priv->clk);
+
+ if (priv->clk.dev)
+ clk_enable(&priv->clk);
+ else
+ dev_warn(dev, "missing clock\n");
+
+ omap_rtc_unlock(priv);
+
+ /*
+ * disable interrupts
+ *
+ * NOTE: ALARM2 is not cleared on AM3352 if rtc_write (writeb) is used
+ */
+ omap_rtc_writel(priv, OMAP_RTC_INTERRUPTS_REG, 0);
+
+ if (priv->type->has_32kclk_en) {
+ reg = omap_rtc_readb(priv, OMAP_RTC_OSC_REG);
+ omap_rtc_writeb(priv, OMAP_RTC_OSC_REG,
+ reg | OMAP_RTC_OSC_32KCLK_EN);
+ }
+
+ /* clear old status */
+ reg = omap_rtc_readb(priv, OMAP_RTC_STATUS_REG);
+
+ mask = OMAP_RTC_STATUS_ALARM;
+
+ if (priv->type->has_pmic_mode)
+ mask |= OMAP_RTC_STATUS_ALARM2;
+
+ if (priv->type->has_power_up_reset) {
+ mask |= OMAP_RTC_STATUS_POWER_UP;
+ if (reg & OMAP_RTC_STATUS_POWER_UP)
+ dev_info(dev, "RTC power up reset detected\n");
+ }
+
+ if (reg & mask)
+ omap_rtc_writeb(priv, OMAP_RTC_STATUS_REG, reg & mask);
+
+ /* On boards with split power, RTC_ON_NOFF won't reset the RTC */
+ reg = omap_rtc_readb(priv, OMAP_RTC_CTRL_REG);
+ if (reg & OMAP_RTC_CTRL_STOP)
+ dev_info(dev, "already running\n");
+
+ /* force to 24 hour mode */
+ new_ctrl = reg & (OMAP_RTC_CTRL_SPLIT | OMAP_RTC_CTRL_AUTO_COMP);
+ new_ctrl |= OMAP_RTC_CTRL_STOP;
+
+ /*
+ * BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE:
+ *
+ * - Device wake-up capability setting should come through chip
+ * init logic. OMAP1 boards should initialize the "wakeup capable"
+ * flag in the platform device if the board is wired right for
+ * being woken up by RTC alarm. For OMAP-L138, this capability
+ * is built into the SoC by the "Deep Sleep" capability.
+ *
+ * - Boards wired so RTC_ON_nOFF is used as the reset signal,
+ * rather than nPWRON_RESET, should forcibly enable split
+ * power mode. (Some chip errata report that RTC_CTRL_SPLIT
+ * is write-only, and always reads as zero...)
+ */
+
+ if (new_ctrl & OMAP_RTC_CTRL_SPLIT)
+ dev_info(dev, "split power mode\n");
+
+ if (reg != new_ctrl)
+ omap_rtc_writeb(priv, OMAP_RTC_CTRL_REG, new_ctrl);
+
+ /*
+ * If we have the external clock then switch to it so we can keep
+ * ticking across suspend.
+ */
+ if (priv->has_ext_clk) {
+ reg = omap_rtc_readb(priv, OMAP_RTC_OSC_REG);
+ reg &= ~OMAP_RTC_OSC_OSC32K_GZ_DISABLE;
+ reg |= OMAP_RTC_OSC_32KCLK_EN | OMAP_RTC_OSC_SEL_32KCLK_SRC;
+ omap_rtc_writeb(priv, OMAP_RTC_OSC_REG, reg);
+ }
+
+ omap_rtc_lock(priv);
+
+ if (omap_rtc_get(dev, &tm)) {
+ dev_err(dev, "failed to get datetime\n");
+ } else if (tm.tm_year == 2000 && tm.tm_mon == 1 && tm.tm_mday == 1 &&
+ tm.tm_wday == 0) {
+ tm.tm_wday = 6;
+ omap_rtc_set(dev, &tm);
+ }
+
+ return 0;
+}
+
+static int omap_rtc_of_to_plat(struct udevice *dev)
+{
+ struct omap_rtc_priv *priv = dev_get_priv(dev);
+
+ priv->base = dev_read_addr(dev);
+ if (priv->base == FDT_ADDR_T_NONE) {
+ dev_err(dev, "invalid address\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "base=%pa\n", &priv->base);
+ return 0;
+}
+
+static const struct rtc_ops omap_rtc_ops = {
+ .get = omap_rtc_get,
+ .set = omap_rtc_set,
+ .reset = omap_rtc_reset,
+ .read = omap_rtc_scratch_read,
+ .write = omap_rtc_scratch_write,
+};
+
+static const struct omap_rtc_device_type omap_rtc_am3352_type = {
+ .has_32kclk_en = true,
+ .has_irqwakeen = true,
+ .has_pmic_mode = true,
+};
+
+static const struct omap_rtc_device_type omap_rtc_da830_type = {
+ .has_32kclk_en = false,
+ .has_irqwakeen = false,
+ .has_pmic_mode = false,
+};
+
+static const struct udevice_id omap_rtc_ids[] = {
+ {.compatible = "ti,am3352-rtc", .data = (ulong)&omap_rtc_am3352_type},
+ {.compatible = "ti,da830-rtc", .data = (ulong)&omap_rtc_da830_type }
+};
+
+U_BOOT_DRIVER(omap_rtc) = {
+ .name = "omap_rtc",
+ .id = UCLASS_RTC,
+ .of_match = omap_rtc_ids,
+ .ops = &omap_rtc_ops,
+ .of_to_plat = omap_rtc_of_to_plat,
+ .probe = omap_rtc_probe,
+ .remove = omap_rtc_remove,
+ .priv_auto = sizeof(struct omap_rtc_priv),
+};
projects / J-u-boot.git / blobdiff