1 | /* This file contains the driver for the GRLIB GPTIMER timers port. The driver |
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2 | * is implemented by using the tlib.c simple timer layer and the Driver |
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3 | * Manager. |
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4 | * |
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5 | * The Driver can be configured using driver resources: |
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6 | * |
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7 | * - timerStart Timer Index if first Timer, this parameters is typically used |
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8 | * in AMP systems for resource allocation. The Timers before |
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9 | * timerStart will not be accessed. |
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10 | * - timerCnt Number of timers that the driver will use, this parameters is |
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11 | * typically used in AMP systems for resource allocation between |
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12 | * OS instances. |
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13 | * - prescaler Base prescaler, normally set by bootloader but can be |
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14 | * overridden. The default scaler reload value set by bootloader |
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15 | * is so that Timers operate in 1MHz. Setting the prescaler to a |
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16 | * lower value increase the accuracy of the timers but shortens |
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17 | * the time until underflow happens. |
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18 | * - clockTimer Used to select a particular timer to be the system clock |
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19 | * timer. This is useful when multiple GPTIMERs cores are |
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20 | * available, or in AMP systems. By default the TLIB selects the |
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21 | * first timer registered as system clock timer. |
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22 | * |
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23 | * The BSP define APBUART_INFO_AVAIL in order to add the info routine |
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24 | * used for debugging. |
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25 | * |
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26 | * COPYRIGHT (c) 2010. |
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27 | * Cobham Gaisler AB. |
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28 | * |
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29 | * The license and distribution terms for this file may be |
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30 | * found in the file LICENSE in this distribution or at |
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31 | * http://www.rtems.com/license/LICENSE. |
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32 | */ |
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33 | |
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34 | #include <rtems.h> |
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35 | #include <bsp.h> |
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36 | #include <stdlib.h> |
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37 | #include <drvmgr/drvmgr.h> |
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38 | #include <drvmgr/ambapp_bus.h> |
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39 | #include <grlib.h> |
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40 | #include <gptimer.h> |
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41 | #include "tlib.h" |
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42 | |
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43 | #if defined(LEON3) && defined(RTEMS_DRVMGR_STARTUP) |
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44 | #include <leon.h> |
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45 | volatile struct gptimer_regs *LEON3_Timer_Regs = 0; |
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46 | #endif |
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47 | |
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48 | #ifdef GPTIMER_INFO_AVAIL |
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49 | #include <stdio.h> |
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50 | #endif |
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51 | |
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52 | /* GPTIMER Core Configuration Register (READ-ONLY) */ |
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53 | #define GPTIMER_CFG_TIMERS_BIT 0 |
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54 | #define GPTIMER_CFG_IRQ_BIT 3 |
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55 | #define GPTIMER_CFG_SI_BIT 8 |
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56 | #define GPTIMER_CFG_DF_BIT 9 |
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57 | |
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58 | #define GPTIMER_CFG_TIMERS (0x7<<GPTIMER_CFG_TIMERS_BIT) |
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59 | #define GPTIMER_CFG_IRQ (0x1f<<GPTIMER_CFG_IRQ_BIT) |
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60 | #define GPTIMER_CFG_SI (1<<GPTIMER_CFG_SI_BIT) |
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61 | #define GPTIMER_CFG_DF (1<<GPTIMER_CFG_DF_BIT) |
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62 | |
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63 | /* GPTIMER Timer Control Register */ |
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64 | #define GPTIMER_CTRL_EN_BIT 0 |
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65 | #define GPTIMER_CTRL_RS_BIT 1 |
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66 | #define GPTIMER_CTRL_LD_BIT 2 |
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67 | #define GPTIMER_CTRL_IE_BIT 3 |
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68 | #define GPTIMER_CTRL_IP_BIT 4 |
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69 | #define GPTIMER_CTRL_CH_BIT 5 |
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70 | #define GPTIMER_CTRL_DH_BIT 6 |
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71 | |
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72 | #define GPTIMER_CTRL_EN (1<<GPTIMER_CTRL_EN_BIT) |
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73 | #define GPTIMER_CTRL_RS (1<<GPTIMER_CTRL_RS_BIT) |
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74 | #define GPTIMER_CTRL_LD (1<<GPTIMER_CTRL_LD_BIT) |
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75 | #define GPTIMER_CTRL_IE (1<<GPTIMER_CTRL_IE_BIT) |
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76 | #define GPTIMER_CTRL_IP (1<<GPTIMER_CTRL_IP_BIT) |
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77 | #define GPTIMER_CTRL_CH (1<<GPTIMER_CTRL_CH_BIT) |
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78 | #define GPTIMER_CTRL_DH (1<<GPTIMER_CTRL_DH_BIT) |
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79 | |
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80 | #define DBG(x...) |
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81 | |
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82 | /* GPTIMER timer private */ |
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83 | struct gptimer_timer { |
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84 | struct tlib_dev tdev; /* Must be first in struct */ |
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85 | struct gptimer_timer_regs *tregs; |
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86 | char index; /* Timer Index in this driver */ |
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87 | char tindex; /* Timer Index In Hardware */ |
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88 | unsigned char irq_ack_mask; |
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89 | }; |
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90 | |
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91 | /* GPTIMER Core private */ |
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92 | struct gptimer_priv { |
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93 | struct drvmgr_dev *dev; |
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94 | struct gptimer_regs *regs; |
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95 | unsigned int base_clk; |
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96 | unsigned int base_freq; |
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97 | int separate_interrupt; |
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98 | |
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99 | /* Structure per Timer unit, the core supports up to 8 timers */ |
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100 | int timer_cnt; |
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101 | struct gptimer_timer timers[0]; |
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102 | }; |
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103 | |
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104 | void gptimer_isr(void *data); |
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105 | |
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106 | #if 0 |
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107 | void gptimer_tlib_irq_register(struct tlib_drv *tdrv, tlib_isr_t func, void *data) |
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108 | { |
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109 | struct gptimer_priv *priv = (struct gptimer_priv *)tdrv; |
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110 | |
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111 | if ( SHARED ...) |
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112 | |
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113 | |
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114 | drvmgr_interrupt_register(); |
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115 | } |
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116 | #endif |
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117 | |
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118 | /******************* Driver manager interface ***********************/ |
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119 | |
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120 | /* Driver prototypes */ |
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121 | static struct tlib_drv gptimer_tlib_drv; |
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122 | int gptimer_device_init(struct gptimer_priv *priv); |
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123 | |
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124 | int gptimer_init1(struct drvmgr_dev *dev); |
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125 | #ifdef GPTIMER_INFO_AVAIL |
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126 | static int gptimer_info( |
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127 | struct drvmgr_dev *dev, |
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128 | void (*print_line)(void *p, char *str), |
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129 | void *p, int, char *argv[]); |
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130 | #define GTIMER_INFO_FUNC gptimer_info |
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131 | #else |
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132 | #define GTIMER_INFO_FUNC NULL |
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133 | #endif |
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134 | |
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135 | struct drvmgr_drv_ops gptimer_ops = |
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136 | { |
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137 | .init = {gptimer_init1, NULL, NULL, NULL}, |
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138 | .remove = NULL, |
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139 | .info = GTIMER_INFO_FUNC, |
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140 | }; |
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141 | |
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142 | struct amba_dev_id gptimer_ids[] = |
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143 | { |
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144 | {VENDOR_GAISLER, GAISLER_GPTIMER}, |
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145 | {VENDOR_GAISLER, GAISLER_GRTIMER}, |
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146 | {0, 0} /* Mark end of table */ |
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147 | }; |
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148 | |
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149 | struct amba_drv_info gptimer_drv_info = |
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150 | { |
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151 | { |
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152 | DRVMGR_OBJ_DRV, /* Driver */ |
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153 | NULL, /* Next driver */ |
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154 | NULL, /* Device list */ |
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155 | DRIVER_AMBAPP_GAISLER_GPTIMER_ID,/* Driver ID */ |
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156 | "GPTIMER_DRV", /* Driver Name */ |
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157 | DRVMGR_BUS_TYPE_AMBAPP, /* Bus Type */ |
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158 | &gptimer_ops, |
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159 | NULL, /* Funcs */ |
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160 | 0, /* No devices yet */ |
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161 | 0, |
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162 | }, |
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163 | &gptimer_ids[0] |
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164 | }; |
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165 | |
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166 | void gptimer_register_drv (void) |
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167 | { |
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168 | DBG("Registering GPTIMER driver\n"); |
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169 | drvmgr_drv_register(&gptimer_drv_info.general); |
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170 | } |
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171 | |
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172 | int gptimer_init1(struct drvmgr_dev *dev) |
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173 | { |
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174 | struct gptimer_priv *priv; |
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175 | struct gptimer_regs *regs; |
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176 | struct amba_dev_info *ambadev; |
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177 | struct ambapp_core *pnpinfo; |
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178 | int timer_hw_cnt, timer_cnt, timer_start; |
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179 | int i, size; |
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180 | struct gptimer_timer *timer; |
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181 | union drvmgr_key_value *value; |
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182 | unsigned char irq_ack_mask; |
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183 | #if defined(LEON3) && defined(RTEMS_DRVMGR_STARTUP) |
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184 | char timer_index[7]; |
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185 | #endif |
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186 | |
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187 | /* Get device information from AMBA PnP information */ |
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188 | ambadev = (struct amba_dev_info *)dev->businfo; |
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189 | if ( ambadev == NULL ) { |
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190 | return -1; |
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191 | } |
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192 | pnpinfo = &ambadev->info; |
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193 | regs = (struct gptimer_regs *)pnpinfo->apb_slv->start; |
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194 | |
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195 | DBG("GPTIMER[%d] on bus %s\n", dev->minor_drv, dev->parent->dev->name); |
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196 | |
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197 | /* Get number of Timers */ |
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198 | timer_hw_cnt = regs->cfg & GPTIMER_CFG_TIMERS; |
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199 | |
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200 | /* Let user spelect a range of timers to be used. In AMP systems |
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201 | * it is sometimes neccessary to leave timers for other CPU instances. |
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202 | * |
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203 | * The default operation in AMP is to shared the timers within the |
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204 | * first GPTIMER core as below. This can of course be overrided by |
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205 | * driver resources. |
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206 | */ |
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207 | timer_cnt = timer_hw_cnt; |
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208 | timer_start = 0; |
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209 | #if defined(RTEMS_MULTIPROCESSING) && defined(LEON3) |
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210 | if ((dev->minor_drv == 0) && drvmgr_on_rootbus(dev)) { |
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211 | timer_cnt = 1; |
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212 | timer_start = LEON3_Cpu_Index; |
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213 | } |
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214 | #endif |
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215 | value = drvmgr_dev_key_get(dev, "timerStart", KEY_TYPE_INT); |
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216 | if ( value) { |
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217 | timer_start = value->i; |
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218 | timer_cnt = timer_hw_cnt - timer_start; |
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219 | } |
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220 | value = drvmgr_dev_key_get(dev, "timerCnt", KEY_TYPE_INT); |
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221 | if ( value && (value->i < timer_cnt) ) { |
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222 | timer_cnt = value->i; |
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223 | } |
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224 | |
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225 | /* Allocate Common Timer Description, size depends on how many timers |
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226 | * are present. |
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227 | */ |
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228 | size = sizeof(struct gptimer_priv) + |
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229 | timer_cnt*sizeof(struct gptimer_timer); |
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230 | priv = dev->priv = (struct gptimer_priv *)malloc(size); |
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231 | if ( !priv ) |
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232 | return DRVMGR_NOMEM; |
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233 | memset(priv, 0, size); |
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234 | priv->dev = dev; |
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235 | priv->regs = regs; |
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236 | |
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237 | #if defined(LEON3) && defined(RTEMS_DRVMGR_STARTUP) |
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238 | if ( drvmgr_on_rootbus(priv->dev) && !LEON3_Timer_Regs) { |
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239 | /* Bootloader has initialized the Timer prescaler to 1MHz, |
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240 | * this means that the AMBA Frequency is 1MHz * PRESCALER. |
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241 | */ |
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242 | priv->base_clk = (regs->scaler_reload + 1) * 1000000; |
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243 | ambapp_bus_freq_register(priv->dev,DEV_APB_SLV,priv->base_clk); |
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244 | LEON3_Timer_Regs = (void *)regs; |
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245 | } else |
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246 | #endif |
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247 | { |
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248 | /* The Base Frequency of the GPTIMER core is the same as the |
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249 | * frequency of the AMBA bus it is situated on. |
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250 | */ |
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251 | drvmgr_freq_get(dev, DEV_APB_SLV, &priv->base_clk); |
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252 | } |
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253 | |
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254 | /* This core will may provide important Timer functionality |
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255 | * to other drivers and the RTEMS kernel, the Clock driver |
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256 | * may for example use this device. So the Timer driver must be |
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257 | * initialized in the first iiitialization stage. |
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258 | */ |
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259 | |
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260 | /*** Initialize Hardware ***/ |
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261 | |
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262 | /* If user request to set prescaler, we will do that. However, note |
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263 | * that doing so for the Root-Bus GPTIMER may affect the RTEMS Clock |
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264 | * so that Clock frequency is wrong. |
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265 | */ |
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266 | value = drvmgr_dev_key_get(priv->dev, "prescaler", KEY_TYPE_INT); |
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267 | if ( value ) |
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268 | regs->scaler_reload = value->i; |
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269 | |
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270 | /* Get Frequency that the timers are operating in (after prescaler) */ |
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271 | priv->base_freq = priv->base_clk / (priv->regs->scaler_reload + 1); |
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272 | |
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273 | /* Stop Timer and probe Pending bit. In newer hardware the |
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274 | * timer has pending bit is cleared by writing a one to it, |
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275 | * whereas older versions it is cleared with a zero. |
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276 | */ |
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277 | priv->regs->timer[timer_start].ctrl = GPTIMER_CTRL_IP; |
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278 | if ((priv->regs->timer[timer_start].ctrl & GPTIMER_CTRL_IP) != 0) |
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279 | irq_ack_mask = ~GPTIMER_CTRL_IP; |
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280 | else |
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281 | irq_ack_mask = ~0; |
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282 | |
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283 | priv->timer_cnt = timer_cnt; |
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284 | for (i=0; i<timer_cnt; i++) { |
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285 | timer = &priv->timers[i]; |
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286 | timer->index = i; |
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287 | timer->tindex = i + timer_start; |
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288 | timer->tregs = ®s->timer[(int)timer->tindex]; |
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289 | timer->tdev.drv = &gptimer_tlib_drv; |
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290 | timer->irq_ack_mask = irq_ack_mask; |
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291 | |
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292 | /* Register Timer at Timer Library */ |
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293 | #if defined(LEON3) && defined(RTEMS_DRVMGR_STARTUP) |
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294 | timer_index[i] = |
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295 | #endif |
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296 | tlib_dev_reg(&timer->tdev); |
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297 | } |
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298 | |
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299 | /* Check Interrupt support implementation, two cases: |
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300 | * A. All Timers share one IRQ |
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301 | * B. Each Timer have an individual IRQ. The number is: |
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302 | * BASE_IRQ + timer_index |
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303 | */ |
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304 | priv->separate_interrupt = regs->cfg & GPTIMER_CFG_SI; |
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305 | |
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306 | if ( priv->separate_interrupt == 0 ) { |
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307 | /* Shared IRQ handler */ |
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308 | drvmgr_interrupt_register( |
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309 | priv->dev, |
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310 | 0, |
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311 | "gptimer_shared", |
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312 | gptimer_isr, |
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313 | priv); |
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314 | } |
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315 | |
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316 | /* Older HW */ |
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317 | |
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318 | |
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319 | |
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320 | /* If the user request a certain Timer to be the RTEMS Clock Timer, |
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321 | * the timer must be registered at the Clock Driver. |
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322 | */ |
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323 | #if defined(LEON3) && defined(RTEMS_DRVMGR_STARTUP) |
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324 | value = drvmgr_dev_key_get(priv->dev, "clockTimer", KEY_TYPE_INT); |
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325 | if ( value && (value->i < timer_cnt) ) { |
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326 | LEON3_Timer_Regs = (void *)regs; |
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327 | Clock_timer_register(timer_index[value->i]); |
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328 | } |
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329 | #endif |
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330 | |
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331 | return DRVMGR_OK; |
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332 | } |
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333 | |
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334 | #ifdef GPTIMER_INFO_AVAIL |
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335 | static int gptimer_info( |
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336 | struct drvmgr_dev *dev, |
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337 | void (*print_line)(void *p, char *str), |
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338 | void *p, int argc, char *argv[]) |
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339 | { |
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340 | struct gptimer_priv *priv = dev->priv; |
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341 | struct gptimer_timer *timer; |
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342 | char buf[64]; |
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343 | int i; |
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344 | |
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345 | if (priv == NULL || argc != 0) |
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346 | return -DRVMGR_EINVAL; |
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347 | |
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348 | sprintf(buf, "Timer Count: %d", priv->timer_cnt); |
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349 | print_line(p, buf); |
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350 | sprintf(buf, "REGS: 0x%08x", (unsigned int)priv->regs); |
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351 | print_line(p, buf); |
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352 | sprintf(buf, "BASE SCALER: %d", priv->regs->scaler_reload); |
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353 | print_line(p, buf); |
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354 | sprintf(buf, "BASE FREQ: %dkHz", priv->base_freq / 1000); |
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355 | print_line(p, buf); |
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356 | sprintf(buf, "SeparateIRQ: %s", priv->separate_interrupt ? "YES":"NO"); |
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357 | print_line(p, buf); |
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358 | |
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359 | for (i=0; i<priv->timer_cnt; i++) { |
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360 | timer = &priv->timers[i]; |
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361 | sprintf(buf, " - TIMER HW Index %d -", timer->tindex); |
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362 | print_line(p, buf); |
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363 | sprintf(buf, " TLIB Index: %d", timer->index); |
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364 | print_line(p, buf); |
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365 | sprintf(buf, " RELOAD REG: %d", timer->tregs->reload); |
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366 | print_line(p, buf); |
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367 | sprintf(buf, " CTRL REG: %d", timer->tregs->ctrl); |
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368 | print_line(p, buf); |
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369 | } |
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370 | |
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371 | return DRVMGR_OK; |
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372 | } |
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373 | #endif |
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374 | |
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375 | static inline struct gptimer_priv *priv_from_timer(struct gptimer_timer *t) |
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376 | { |
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377 | return (struct gptimer_priv *) |
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378 | ((unsigned int)t - |
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379 | sizeof(struct gptimer_priv) - |
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380 | t->index * sizeof(struct gptimer_timer)); |
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381 | } |
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382 | |
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383 | static int gptimer_tlib_int_pend(struct tlib_dev *hand, int ack) |
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384 | { |
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385 | struct gptimer_timer *timer = (struct gptimer_timer *)hand; |
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386 | unsigned int ctrl = timer->tregs->ctrl; |
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387 | |
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388 | if ((ctrl & (GPTIMER_CTRL_IP | GPTIMER_CTRL_IE)) == |
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389 | (GPTIMER_CTRL_IP | GPTIMER_CTRL_IE)) { |
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390 | /* clear Pending IRQ ? */ |
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391 | if (ack) |
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392 | timer->tregs->ctrl = ctrl & timer->irq_ack_mask; |
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393 | return 1; /* timer generated IRQ */ |
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394 | } else |
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395 | return 0; /* was not timer causing IRQ */ |
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396 | } |
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397 | |
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398 | void gptimer_isr(void *data) |
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399 | { |
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400 | struct gptimer_priv *priv = data; |
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401 | int i; |
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402 | |
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403 | /* Check all timers for IRQ */ |
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404 | for (i=0;i<priv->timer_cnt; i++) { |
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405 | if (gptimer_tlib_int_pend((void *)&priv->timers[i], 0)) { |
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406 | /* IRQ Was generated by Timer and Pending flag has *not* |
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407 | * yet been cleared, this is to allow ISR to look at |
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408 | * pending bit. Call ISR registered. Clear pending bit. |
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409 | */ |
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410 | if (priv->timers[i].tdev.isr_func) { |
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411 | priv->timers[i].tdev.isr_func( |
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412 | priv->timers[i].tdev.isr_data); |
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413 | } |
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414 | gptimer_tlib_int_pend((void *)&priv->timers[i], 1); |
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415 | } |
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416 | } |
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417 | } |
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418 | |
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419 | static void gptimer_tlib_reset(struct tlib_dev *hand) |
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420 | { |
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421 | struct gptimer_timer *timer = (struct gptimer_timer *)hand; |
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422 | |
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423 | timer->tregs->ctrl = 0; |
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424 | timer->tregs->reload = 0xffffffff; |
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425 | timer->tregs->ctrl = GPTIMER_CTRL_LD; |
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426 | } |
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427 | |
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428 | static void gptimer_tlib_get_freq( |
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429 | struct tlib_dev *hand, |
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430 | unsigned int *basefreq, |
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431 | unsigned int *tickrate) |
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432 | { |
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433 | struct gptimer_timer *timer = (struct gptimer_timer *)hand; |
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434 | struct gptimer_priv *priv = priv_from_timer(timer); |
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435 | |
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436 | /* Calculate base frequency from Timer Clock and Prescaler */ |
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437 | if ( basefreq ) |
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438 | *basefreq = priv->base_freq; |
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439 | if ( tickrate ) |
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440 | *tickrate = timer->tregs->reload + 1; |
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441 | } |
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442 | |
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443 | static int gptimer_tlib_set_freq(struct tlib_dev *hand, unsigned int tickrate) |
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444 | { |
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445 | struct gptimer_timer *timer = (struct gptimer_timer *)hand; |
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446 | |
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447 | timer->tregs->reload = tickrate - 1; |
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448 | |
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449 | /*Check that value was allowed (Timer may not be as wide as expected)*/ |
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450 | if ( timer->tregs->reload != (tickrate - 1) ) |
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451 | return -1; |
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452 | else |
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453 | return 0; |
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454 | } |
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455 | |
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456 | static void gptimer_tlib_irq_reg(struct tlib_dev *hand, tlib_isr_t func, void *data) |
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457 | { |
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458 | struct gptimer_timer *timer = (struct gptimer_timer *)hand; |
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459 | struct gptimer_priv *priv = priv_from_timer(timer); |
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460 | |
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461 | if ( priv->separate_interrupt ) { |
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462 | drvmgr_interrupt_register(priv->dev, timer->tindex, |
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463 | "gptimer", func, data); |
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464 | } |
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465 | |
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466 | timer->tregs->ctrl |= GPTIMER_CTRL_IE; |
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467 | } |
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468 | |
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469 | static void gptimer_tlib_irq_unreg(struct tlib_dev *hand, tlib_isr_t func, void *data) |
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470 | { |
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471 | struct gptimer_timer *timer = (struct gptimer_timer *)hand; |
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472 | struct gptimer_priv *priv = priv_from_timer(timer); |
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473 | |
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474 | /* Turn off IRQ at source, unregister IRQ handler */ |
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475 | timer->tregs->ctrl &= ~GPTIMER_CTRL_IE; |
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476 | |
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477 | if ( priv->separate_interrupt ) { |
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478 | drvmgr_interrupt_unregister(priv->dev, timer->tindex, |
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479 | func, data); |
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480 | } else { |
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481 | timer->tdev.isr_func = NULL; |
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482 | } |
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483 | } |
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484 | |
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485 | static void gptimer_tlib_start(struct tlib_dev *hand, int once) |
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486 | { |
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487 | struct gptimer_timer *timer = (struct gptimer_timer *)hand; |
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488 | unsigned int ctrl; |
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489 | |
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490 | /* Load the selected frequency before starting Frequency */ |
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491 | ctrl = GPTIMER_CTRL_LD | GPTIMER_CTRL_EN; |
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492 | if ( once == 0 ) |
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493 | ctrl |= GPTIMER_CTRL_RS; /* Restart Timer */ |
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494 | timer->tregs->ctrl |= ctrl; |
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495 | } |
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496 | |
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497 | static void gptimer_tlib_stop(struct tlib_dev *hand) |
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498 | { |
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499 | struct gptimer_timer *timer = (struct gptimer_timer *)hand; |
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500 | |
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501 | /* Load the selected Frequency */ |
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502 | timer->tregs->ctrl &= ~(GPTIMER_CTRL_EN|GPTIMER_CTRL_IP); |
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503 | } |
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504 | |
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505 | static void gptimer_tlib_restart(struct tlib_dev *hand) |
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506 | { |
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507 | struct gptimer_timer *timer = (struct gptimer_timer *)hand; |
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508 | |
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509 | timer->tregs->ctrl |= GPTIMER_CTRL_LD | GPTIMER_CTRL_EN; |
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510 | } |
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511 | |
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512 | static void gptimer_tlib_get_counter( |
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513 | struct tlib_dev *hand, |
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514 | unsigned int *counter) |
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515 | { |
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516 | struct gptimer_timer *timer = (struct gptimer_timer *)hand; |
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517 | |
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518 | *counter = timer->tregs->value; |
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519 | } |
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520 | |
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521 | static struct tlib_drv gptimer_tlib_drv = |
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522 | { |
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523 | .reset = gptimer_tlib_reset, |
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524 | .get_freq = gptimer_tlib_get_freq, |
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525 | .set_freq = gptimer_tlib_set_freq, |
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526 | .irq_reg = gptimer_tlib_irq_reg, |
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527 | .irq_unreg = gptimer_tlib_irq_unreg, |
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528 | .start = gptimer_tlib_start, |
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529 | .stop = gptimer_tlib_stop, |
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530 | .restart = gptimer_tlib_restart, |
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531 | .get_counter = gptimer_tlib_get_counter, |
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532 | .custom = NULL, |
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533 | .int_pend = gptimer_tlib_int_pend, |
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534 | }; |
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