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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2011 DENX Software Engineering GmbH
- * Heiko Schocher <hs@denx.de>
- * Copyright (C) 2021 Dario Binacchi <dariobin@libero.it>
- */
- #include <common.h>
- #include <command.h>
- #include <dm.h>
- #include <clk.h>
- #include <log.h>
- #include <rtc.h>
- #include <asm/io.h>
- #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;
- };
- 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;
- };
- static inline u8 omap_rtc_readb(struct omap_rtc_priv *priv, unsigned int reg)
- {
- return readb(priv->base + reg);
- }
- static inline u32 omap_rtc_readl(struct omap_rtc_priv *priv, unsigned int reg)
- {
- return readl(priv->base + reg);
- }
- 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;
- }
- /* 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);
- 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;
- 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;
- }
- static int omap_rtc_scratch_write(struct udevice *dev, uint offset,
- const 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;
- 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;
- }
- static int omap_rtc_remove(struct udevice *dev)
- {
- struct omap_rtc_priv *priv = dev_get_priv(dev);
- u8 reg;
- 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;
- }
- 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),
- };
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