[d55d7a0] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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| 4 | * @ingroup arm_beagle |
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| 5 | * |
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| 6 | * @brief RTC driver for AM335x SoC. |
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| 7 | * |
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| 8 | */ |
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| 9 | |
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| 10 | /* |
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| 11 | * Copyright (c) 2015 Ragunath <ragunath3252@gmail.com>. |
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| 12 | * |
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| 13 | * The license and distribution terms for this file may be |
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| 14 | * found in the file LICENSE in this distribution or at |
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| 15 | * http://www.rtems.com/license/LICENSE. |
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| 16 | */ |
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| 17 | |
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| 18 | #include <bspopts.h> |
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| 19 | |
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| 20 | #if IS_AM335X |
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| 21 | #include <rtems.h> |
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| 22 | #include <bsp.h> |
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| 23 | #include <time.h> |
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| 24 | #include <libchip/rtc.h> |
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| 25 | #include <libcpu/omap3.h> |
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| 26 | |
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| 27 | #define setbit(a,x) (a | (1<<x)) |
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| 28 | #define bcd(a) ((a & 0x0f)+ (((a & 0xf0) >> 4 )*10)) |
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| 29 | #define dec(a) (((a / 10) << 4) | (a % 10)) |
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| 30 | #define WRITE_WAIT_MAX_COUNT 10000 |
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| 31 | |
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| 32 | size_t RTC_Count = 1; |
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| 33 | |
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| 34 | static void rtc_write_enable(void); |
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| 35 | static void rtc_write_disable(void); |
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| 36 | static int rtc_write_wait(void); |
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| 37 | static void rtc_clk_init(void); |
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| 38 | void rtc_init(int minor); |
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| 39 | void print_time(void); |
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| 40 | int am335x_rtc_gettime(int minor,rtems_time_of_day *t); |
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| 41 | int am335x_rtc_settime(int minor, const rtems_time_of_day *t); |
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| 42 | void am335x_rtc_debug(void); |
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| 43 | |
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| 44 | /* |
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| 45 | * probe for a rtc. we always claim to have one. |
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| 46 | */ |
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| 47 | static bool am335x_rtc_probe (int minor) |
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| 48 | { |
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| 49 | return true; |
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| 50 | } |
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| 51 | |
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| 52 | /* |
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| 53 | * Write key values to kick0 and kick1 registers to enable write access |
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| 54 | */ |
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| 55 | static void rtc_write_enable(void) |
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| 56 | { |
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| 57 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_KICK0,AM335X_RTC_KICK0_KEY); |
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| 58 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_KICK1,AM335X_RTC_KICK1_KEY); |
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| 59 | } |
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| 60 | |
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| 61 | /* |
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| 62 | * Write random (0x11111111) value to kick0 and kick1 registers to disable write access |
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| 63 | */ |
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| 64 | static void rtc_write_disable(void) |
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| 65 | { |
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| 66 | /* Write some random value other than key to disable*/ |
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| 67 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_KICK0,0x11111111); |
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| 68 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_KICK1,0x11111111); |
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| 69 | } |
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| 70 | |
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| 71 | /* |
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| 72 | * Wait till busy bit is reset |
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| 73 | */ |
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| 74 | static int rtc_write_wait(void) |
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| 75 | { |
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| 76 | int i = WRITE_WAIT_MAX_COUNT; |
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| 77 | while((mmio_read(AM335X_RTC_BASE+AM335X_RTC_STATUS_REG) & 0x1) && (i--)); |
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| 78 | |
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| 79 | if(i == 0) |
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| 80 | return RTEMS_RESOURCE_IN_USE; |
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| 81 | else |
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| 82 | return RTEMS_SUCCESSFUL; |
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| 83 | } |
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| 84 | |
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| 85 | |
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| 86 | /* |
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| 87 | * Initialize RTC clock |
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| 88 | */ |
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| 89 | static void rtc_clk_init(void) |
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| 90 | { |
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| 91 | uint32_t a = 0x0; |
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| 92 | |
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| 93 | a = setbit(a,1); |
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| 94 | /* IDLEST = 0x0 & MODULEMODE = 0x1*/ |
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| 95 | mmio_write(CM_RTC_BASE+CM_RTC_RTC_CLKCTRL,a); |
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| 96 | a = 0x0; |
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| 97 | |
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| 98 | /*32K rtc clock active*/ |
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| 99 | a = setbit(a,9); |
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| 100 | a = setbit(a,8); |
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| 101 | mmio_write(CM_RTC_BASE+CM_RTC_CLKSTCTRL,a); |
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| 102 | } |
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| 103 | |
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| 104 | void rtc_init(int minor) |
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| 105 | { |
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| 106 | uint32_t a = 0x0; |
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| 107 | |
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| 108 | rtc_clk_init(); |
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| 109 | /* |
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| 110 | * Steps to enable RTC |
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| 111 | * 1. Enable the module clock domains (rtc_clk_init). |
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| 112 | * 2. Enable the RTC module using CTRL_REG.RTC_disable. (Default enabled. Nothing done) |
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| 113 | * 3. Enable the 32K clock from PER PLL, if using the internal RTC oscillator. |
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| 114 | * 4. Write to the kick registers (KICK0R, KICK1R) in the RTC. |
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| 115 | * 5. Configure the timer in RTCSS for desired application (set time and date, alarm wakeup, and so on). |
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| 116 | * 6. Start the RTC (in CTRL_REG.STOP_RTC). |
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| 117 | */ |
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| 118 | rtc_write_enable(); |
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| 119 | a = setbit(a,0); |
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| 120 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_SYSCONFIG,a); |
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| 121 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_OSC_CLOCK); |
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| 122 | a = setbit(a,6); |
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| 123 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_OSC_CLOCK,a); |
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| 124 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_CTRL_REG); |
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| 125 | a = setbit(a,0); |
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| 126 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_CTRL_REG,a); |
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| 127 | |
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| 128 | rtc_write_disable(); |
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| 129 | } |
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| 130 | |
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| 131 | int am335x_rtc_gettime(int minor,rtems_time_of_day *t) |
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| 132 | { |
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| 133 | uint32_t a = 0x0; |
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| 134 | |
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| 135 | if(minor != 0) |
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| 136 | return RTEMS_INVALID_NUMBER; |
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| 137 | |
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| 138 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_SECS); |
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| 139 | t->second = bcd(a); |
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| 140 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_MINS); |
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| 141 | t->minute = bcd(a); |
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| 142 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_HOURS); |
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| 143 | t->hour = bcd(a); |
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| 144 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_DAYS); |
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| 145 | t->day = bcd(a); |
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| 146 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_MONTHS); |
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| 147 | t->month = bcd(a); |
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| 148 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_YEARS); |
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| 149 | t->year = bcd(a)+2000; |
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| 150 | t->ticks=0; |
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| 151 | return RTEMS_SUCCESSFUL; |
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| 152 | } |
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| 153 | |
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| 154 | int am335x_rtc_settime(int minor,const rtems_time_of_day *t) |
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| 155 | { |
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| 156 | uint32_t a=0x0; |
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| 157 | int rv; |
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| 158 | |
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| 159 | if(minor != 0) |
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| 160 | return RTEMS_INVALID_NUMBER; |
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| 161 | |
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| 162 | rtc_write_enable(); |
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| 163 | |
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| 164 | /* Wait till the busy bit is reset to write again*/ |
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| 165 | a = t->second; |
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| 166 | rv=rtc_write_wait(); |
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| 167 | if(rv != RTEMS_SUCCESSFUL) |
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| 168 | return rv; |
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| 169 | a = mmio_write(AM335X_RTC_BASE+AM335X_RTC_SECS,dec(a) & 0x7f); |
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| 170 | |
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| 171 | a = t->minute; |
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| 172 | rv=rtc_write_wait(); |
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| 173 | if(rv != RTEMS_SUCCESSFUL) |
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| 174 | return rv; |
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| 175 | a = mmio_write(AM335X_RTC_BASE+AM335X_RTC_MINS,dec(a) & 0x7f); |
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| 176 | |
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| 177 | a = t->hour; |
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| 178 | rv=rtc_write_wait(); |
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| 179 | if(rv != RTEMS_SUCCESSFUL) |
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| 180 | return rv; |
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| 181 | a = mmio_write(AM335X_RTC_BASE+AM335X_RTC_HOURS,dec(a) & 0x3f); |
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| 182 | |
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| 183 | a = t->day; |
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| 184 | rv=rtc_write_wait(); |
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| 185 | if(rv != RTEMS_SUCCESSFUL) |
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| 186 | return rv; |
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| 187 | a = mmio_write(AM335X_RTC_BASE+AM335X_RTC_DAYS,dec(a) & 0x3f); |
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| 188 | |
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| 189 | a = t->month; |
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| 190 | rv=rtc_write_wait(); |
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| 191 | if(rv != RTEMS_SUCCESSFUL) |
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| 192 | return rv; |
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| 193 | a = mmio_write(AM335X_RTC_BASE+AM335X_RTC_MONTHS,dec(a) & 0x1f); |
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| 194 | |
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| 195 | a = t->year; |
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| 196 | rv=rtc_write_wait(); |
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| 197 | if(rv != RTEMS_SUCCESSFUL) |
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| 198 | return rv; |
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| 199 | a = mmio_write(AM335X_RTC_BASE+AM335X_RTC_YEARS,(dec(a)%100) & 0xff); |
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| 200 | |
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| 201 | rtc_write_disable(); |
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| 202 | return rv; |
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| 203 | } |
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| 204 | |
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| 205 | #if BBB_DEBUG |
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| 206 | void print_time(void) |
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| 207 | { |
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| 208 | uint32_t a = 0x0; |
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| 209 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_SECS); |
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| 210 | printk("\n\rSecs %x",a); |
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| 211 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_MINS); |
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| 212 | printk("\n\rMins %x",a); |
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| 213 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_HOURS); |
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| 214 | printk("\n\rHours %x",a); |
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| 215 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_DAYS); |
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| 216 | printk("\n\rDays %x",a); |
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| 217 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_MONTHS); |
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| 218 | printk("\n\r Months %x",a); |
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| 219 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_YEARS); |
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| 220 | printk("\n\rYears %x",a); |
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| 221 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_WEEKS); |
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| 222 | printk("\n\rWeeks %x",a); |
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| 223 | } |
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| 224 | |
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| 225 | void am335x_rtc_debug(void) |
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| 226 | { |
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| 227 | int i; |
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| 228 | rtems_time_of_day t,r; |
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| 229 | |
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| 230 | t.second = 1; |
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| 231 | t.minute = 1; |
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| 232 | t.hour = 1; |
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| 233 | t.day = 7; |
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| 234 | t.month = 3; |
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| 235 | t. year = 2015; |
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| 236 | |
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| 237 | am335x_rtc_settime(0,&t); |
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| 238 | am335x_rtc_gettime(0,&r); |
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| 239 | |
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| 240 | printk("Secs %x",r.second); |
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| 241 | printk("Mins %x",r.minute); |
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| 242 | printk("Hours %x",r.hour); |
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| 243 | printk("Days %x",r.day); |
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| 244 | printk("Months %x",r.month); |
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| 245 | printk("Years %x",r.year); |
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| 246 | } |
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| 247 | #endif |
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| 248 | |
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| 249 | /* |
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| 250 | * driver function table. |
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| 251 | */ |
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| 252 | rtc_fns am335x_rtc_fns = { |
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| 253 | rtc_init, |
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| 254 | am335x_rtc_gettime, |
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| 255 | am335x_rtc_settime |
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| 256 | }; |
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| 257 | |
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| 258 | /* |
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| 259 | * the following table configures the RTC drivers used in this BSP |
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| 260 | */ |
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| 261 | |
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| 262 | rtc_tbl RTC_Table[] = { |
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| 263 | { |
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| 264 | "/dev/rtc", /* sDeviceName */ |
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| 265 | RTC_CUSTOM, /* deviceType */ |
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| 266 | &am335x_rtc_fns, /* pDeviceFns */ |
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| 267 | am335x_rtc_probe, /* deviceProbe */ |
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| 268 | NULL, /* pDeviceParams */ |
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| 269 | 0, /* ulCtrlPort1 */ |
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| 270 | 0, /* ulDataPort */ |
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| 271 | NULL, /* getRegister */ |
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| 272 | NULL /* setRegister */ |
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| 273 | } |
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| 274 | }; |
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| 275 | |
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| 276 | #endif |
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