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 BeagleBoard SPI bus initialization and API Support. |
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7 | * |
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8 | * Based on bsps/m68k/gen68360/spi/m360_spi.c |
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9 | */ |
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10 | |
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11 | /* |
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12 | * Copyright (c) 2018 Pierre-Louis Garnier <garnie_a@epita.fr> |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.org/license/LICENSE. |
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17 | */ |
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18 | #include <bsp.h> |
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19 | #include <bsp/bbb-gpio.h> |
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20 | #include <bsp/spi.h> |
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21 | #include <errno.h> |
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22 | #include <rtems/bspIo.h> |
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23 | #include <rtems/error.h> |
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24 | #include <rtems/libi2c.h> |
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25 | #include <stdio.h> |
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26 | #include <stdlib.h> |
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27 | |
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28 | // #define DEBUG |
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29 | // #define TRACE |
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30 | |
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31 | #define EVENT_TXEMPTY RTEMS_EVENT_0 |
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32 | #define EVENT_RXFULL RTEMS_EVENT_1 |
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33 | |
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34 | static void SPI0ModuleClkConfig(void) |
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35 | { |
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36 | /* Writing to MODULEMODE field of AM335X_CM_PER_SPI0_CLKCTRL register. */ |
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37 | REG( AM335X_CM_PER_ADDR + AM335X_CM_PER_SPI0_CLKCTRL ) |= |
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38 | AM335X_CM_PER_SPI0_CLKCTRL_MODULEMODE_ENABLE; |
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39 | |
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40 | /* Waiting for MODULEMODE field to reflect the written value. */ |
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41 | while ( AM335X_CM_PER_SPI0_CLKCTRL_MODULEMODE_ENABLE != |
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42 | ( REG( AM335X_CM_PER_ADDR + AM335X_CM_PER_SPI0_CLKCTRL ) & |
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43 | AM335X_CM_PER_SPI0_CLKCTRL_MODULEMODE ) ) |
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44 | continue; |
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45 | |
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46 | /* |
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47 | * Waiting for IDLEST field in AM335X_CM_PER_SPI0_CLKCTRL |
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48 | * register to attain desired value. |
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49 | */ |
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50 | while ( ( AM335X_CM_PER_CONTROL_CLKCTRL_IDLEST_FUNC << |
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51 | AM335X_CM_PER_CONTROL_CLKCTRL_IDLEST_SHIFT ) != |
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52 | ( REG( AM335X_CM_PER_ADDR + AM335X_CM_PER_SPI0_CLKCTRL ) & |
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53 | AM335X_CM_PER_CONTROL_CLKCTRL_IDLEST ) ) |
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54 | continue; |
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55 | } |
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56 | |
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57 | static inline void am335x_spi_clear_irqstatus(uint32_t reg_base, uint32_t irqs) |
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58 | { |
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59 | REG(reg_base + AM335X_SPI_SYST) &= ~AM335X_SPI_SYST_SSB; |
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60 | REG(reg_base + AM335X_SPI_IRQSTATUS) = irqs; |
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61 | } |
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62 | |
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63 | static void am335x_spi0_pinmux(void) |
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64 | { |
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65 | REG(AM335X_PADCONF_BASE + AM335X_CONF_SPI0_SCLK) = |
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66 | (BBB_RXACTIVE | BBB_SLEWCTRL | BBB_PU_EN); |
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67 | |
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68 | REG(AM335X_PADCONF_BASE + AM335X_CONF_SPI0_D0) = |
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69 | (BBB_RXACTIVE | BBB_SLEWCTRL | BBB_PU_EN); |
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70 | |
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71 | REG(AM335X_PADCONF_BASE + AM335X_CONF_SPI0_D1) = |
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72 | (BBB_RXACTIVE | BBB_SLEWCTRL | BBB_PU_EN); |
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73 | |
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74 | REG(AM335X_PADCONF_BASE + AM335X_CONF_SPI0_CS0) = |
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75 | (BBB_RXACTIVE | BBB_PU_EN); |
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76 | } |
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77 | |
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78 | static void am335x_spi_reset(uint32_t reg_base) |
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79 | { |
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80 | int timeout = BBB_SPI_TIMEOUT; |
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81 | |
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82 | REG(reg_base + AM335X_SPI_SYSCONFIG) |= AM335X_SPI_SYSCONFIG_SOFTRESET; |
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83 | |
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84 | while ((REG(reg_base + AM335X_SPI_SYSSTATUS) & AM335X_SPI_SYSSTATUS_RESETDONE) == 0 && timeout--) { |
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85 | if (timeout <= 0) { |
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86 | puts("ERROR: Timeout in soft-reset\n"); |
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87 | |
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88 | return; |
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89 | } |
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90 | |
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91 | udelay(1000); |
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92 | } |
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93 | } |
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94 | |
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95 | static void beagle_spi_irq_handler(void *arg) |
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96 | { |
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97 | const uint32_t handled_irqs = AM335X_SPI_IRQSTATUS_TX0_EMPTY | AM335X_SPI_IRQSTATUS_RX0_FULL; |
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98 | |
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99 | beagle_spi_softc_t *softc_ptr = arg; |
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100 | |
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101 | rtems_status_code sc = -1; |
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102 | |
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103 | uint32_t irq = 0; |
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104 | uint32_t events = 0; |
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105 | |
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106 | uint32_t tmp; |
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107 | while ((tmp = (REG(softc_ptr->regs_base + AM335X_SPI_IRQSTATUS)) & handled_irqs) != 0) { |
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108 | irq |= tmp; |
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109 | am335x_spi_clear_irqstatus(softc_ptr->regs_base, tmp); |
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110 | } |
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111 | |
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112 | #if defined(TRACE) |
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113 | printk("beagle_spi_irq_handler: AM335X_SPI_IRQSTATUS = 0x%04lx\r\n", irq); |
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114 | #endif |
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115 | |
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116 | if (irq & AM335X_SPI_IRQSTATUS_TX0_EMPTY) { |
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117 | #if defined(TRACE) |
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118 | printk("beagle_spi_irq_handler: sending event TXEMPTY to task_id = %ld\r\n", softc_ptr->task_id); |
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119 | #endif |
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120 | |
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121 | events |= EVENT_TXEMPTY; |
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122 | } |
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123 | |
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124 | if (irq & AM335X_SPI_IRQSTATUS_RX0_FULL) { |
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125 | #if defined(TRACE) |
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126 | printk("beagle_spi_irq_handler: sending event RXFULL to task_id = %ld\r\n", softc_ptr->task_id); |
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127 | #endif |
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128 | |
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129 | events |= EVENT_RXFULL; |
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130 | } |
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131 | |
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132 | sc = rtems_event_send(softc_ptr->task_id, events); |
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133 | _Assert(sc == RTEMS_SUCCESSFUL); |
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134 | (void)sc; |
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135 | } |
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136 | |
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137 | /* Initialize the driver |
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138 | * |
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139 | * Returns: o = ok or error code |
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140 | */ |
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141 | rtems_status_code beagle_spi_init |
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142 | ( |
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143 | rtems_libi2c_bus_t *bh /* bus specifier structure */ |
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144 | ) |
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145 | { |
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146 | beagle_spi_softc_t *softc_ptr = &(((beagle_spi_desc_t *)(bh))->softc); |
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147 | |
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148 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
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149 | |
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150 | #if defined(DEBUG) |
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151 | printk("beagle_spi_init called...\r\n"); |
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152 | #endif |
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153 | |
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154 | SPI0ModuleClkConfig(); |
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155 | am335x_spi0_pinmux(); |
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156 | am335x_spi_reset(softc_ptr->regs_base); |
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157 | |
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158 | REG(softc_ptr->regs_base + AM335X_SPI_MODULCTRL) &= ~AM335X_SPI_MODULCTRL_PIN34; |
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159 | REG(softc_ptr->regs_base + AM335X_SPI_MODULCTRL) &= ~AM335X_SPI_MODULCTRL_MS; // Master mode |
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160 | REG(softc_ptr->regs_base + AM335X_SPI_MODULCTRL) |= AM335X_SPI_MODULCTRL_SINGLE; // Single channel |
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161 | REG(softc_ptr->regs_base + AM335X_SPI_MODULCTRL) &= ~AM335X_SPI_MODULCTRL_PIN34; // SPIEN is usedas a chip select |
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162 | // REG(softc_ptr->regs_base + AM335X_SPI_MODULCTRL) |= (1 << 3); // Test mode |
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163 | |
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164 | // REG(softc_ptr->regs_base + AM335X_SPI_SYST) |= AM335X_SPI_SYST_SPIEN_0; // Not sure about this |
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165 | // REG(softc_ptr->regs_base + AM335X_SPI_SYST) |= AM335X_SPI_SYST_SPIDATDIR0; // Input |
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166 | // REG(softc_ptr->regs_base + AM335X_SPI_SYST) &= ~AM335X_SPI_SYST_SPIDATDIR1; // Output |
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167 | |
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168 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) &= ~AM335X_SPI_CH0CONF_TRM_MASK; |
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169 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) |= AM335X_SPI_CH0CONF_DPE0; |
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170 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) &= ~AM335X_SPI_CH0CONF_DPE1; |
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171 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) &= ~AM335X_SPI_CH0CONF_IS; |
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172 | |
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173 | // REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) |= AM335X_SPI_CH0CONF_FFEW; |
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174 | // REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) |= AM335X_SPI_CH0CONF_FFER; |
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175 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) |= AM335X_SPI_CH0CONF_WL(8 - 1); |
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176 | |
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177 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) &= ~AM335X_SPI_CH0CONF_PHA; |
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178 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) &= ~AM335X_SPI_CH0CONF_POL; |
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179 | |
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180 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) |= AM335X_SPI_CH0CONF_EPOL; |
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181 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) |= AM335X_SPI_CH0CONF_CLKD(0x1); |
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182 | |
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183 | |
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184 | // Setup interrupt |
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185 | rc = rtems_interrupt_handler_install( |
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186 | softc_ptr->irq, |
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187 | NULL, |
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188 | RTEMS_INTERRUPT_UNIQUE, |
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189 | (rtems_interrupt_handler)beagle_spi_irq_handler, |
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190 | softc_ptr |
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191 | ); |
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192 | |
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193 | #if defined(DEBUG) |
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194 | printk("beagle_spi_init done\r\n"); |
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195 | #endif |
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196 | |
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197 | if (rc == RTEMS_SUCCESSFUL) { |
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198 | softc_ptr->initialized = TRUE; |
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199 | } |
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200 | |
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201 | return rc; |
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202 | } |
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203 | |
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204 | static int beagle_spi_read_write_bytes( |
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205 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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206 | unsigned char *rx_buf, /* buffer to store bytes */ |
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207 | unsigned char *tx_buf, /* buffer to send */ |
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208 | int len /* number of bytes to send */ |
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209 | ) |
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210 | { |
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211 | beagle_spi_softc_t *softc_ptr = &(((beagle_spi_desc_t *)(bh))->softc); |
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212 | |
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213 | rtems_status_code sc; |
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214 | rtems_event_set received_events; |
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215 | |
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216 | #if defined(TRACE) |
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217 | printk("beagle_spi_read_write_bytes called...\r\n"); |
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218 | #endif |
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219 | |
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220 | softc_ptr->task_id = rtems_task_self(); |
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221 | |
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222 | // Enable IRQs |
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223 | |
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224 | if (rx_buf) { |
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225 | am335x_spi_clear_irqstatus(softc_ptr->regs_base, AM335X_SPI_IRQSTATUS_RX0_FULL); |
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226 | REG(softc_ptr->regs_base + AM335X_SPI_IRQENABLE) |= AM335X_SPI_IRQENABLE_RX0_FULL; |
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227 | } |
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228 | |
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229 | if (tx_buf) { |
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230 | am335x_spi_clear_irqstatus(softc_ptr->regs_base, AM335X_SPI_IRQSTATUS_TX0_EMPTY); |
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231 | REG(softc_ptr->regs_base + AM335X_SPI_IRQENABLE) |= AM335X_SPI_IRQENABLE_TX0_EMPTY; |
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232 | } |
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233 | |
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234 | // Enable Channel |
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235 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) |= AM335X_SPI_CH0CONF_FORCE; |
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236 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CTRL) |= AM335X_SPI_CH0CTRL_EN; |
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237 | |
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238 | // Main loop |
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239 | for (int i = 0; i < len; i++) { |
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240 | received_events = 0; |
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241 | |
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242 | if (tx_buf) { |
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243 | // Wait for IRQ to wake us up (room in TX FIFO) |
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244 | #if defined(TRACE) |
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245 | printk("beagle_spi_read_write_bytes: waiting (task_id = %ld)\r\n", softc_ptr->task_id); |
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246 | #endif |
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247 | |
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248 | sc = rtems_event_receive(EVENT_TXEMPTY, RTEMS_WAIT, BBB_SPI_TIMEOUT, &received_events); |
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249 | if (sc != RTEMS_SUCCESSFUL) { |
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250 | printk("ERROR: beagle_spi_read_write_bytes timed out on tx byte number %d\n", i); |
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251 | return i > 0 ? i : -RTEMS_TIMEOUT; |
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252 | } |
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253 | |
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254 | _Assert(received_events == EVENT_TXEMPTY); |
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255 | |
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256 | #if defined(TRACE) |
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257 | printk("beagle_spi_read_write_bytes: sending byte: i = %d, tx_buf[i] = 0x%x\r\n", i, tx_buf[i]); |
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258 | #endif |
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259 | |
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260 | REG(softc_ptr->regs_base + AM335X_SPI_TX0) = tx_buf[i]; |
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261 | } |
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262 | |
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263 | if (rx_buf) { |
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264 | // Wait for IRQ to wake us up (data in RX FIFO) |
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265 | if ((received_events & EVENT_RXFULL) == 0) { |
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266 | sc = rtems_event_receive(EVENT_RXFULL, RTEMS_WAIT, BBB_SPI_TIMEOUT, &received_events); |
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267 | if (sc != RTEMS_SUCCESSFUL) { |
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268 | printk("ERROR: beagle_spi_read_write_bytes timed out on rx byte number %d\n", i); |
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269 | return i > 0 ? i : -RTEMS_TIMEOUT; |
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270 | } |
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271 | |
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272 | _Assert(received_events == EVENT_RXFULL); |
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273 | } |
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274 | |
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275 | rx_buf[i] = REG(softc_ptr->regs_base + AM335X_SPI_RX0); |
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276 | |
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277 | #if defined(TRACE) |
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278 | printk("beagle_spi_read_write_bytes: received byte: i = %d, rx_buf[i] = 0x%x\r\n", i, rx_buf[i]); |
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279 | #endif |
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280 | } |
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281 | } |
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282 | |
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283 | // REG(softc_ptr->regs_base + AM335X_SPI_IRQENABLE) &= ~AM335X_SPI_IRQENABLE_RX0_FULL; |
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284 | // REG(softc_ptr->regs_base + AM335X_SPI_IRQENABLE) &= ~AM335X_SPI_IRQENABLE_TX0_EMPTY; |
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285 | |
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286 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CTRL) &= ~AM335X_SPI_CH0CTRL_EN; |
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287 | REG(softc_ptr->regs_base + AM335X_SPI_CH0CONF) &= ~AM335X_SPI_CH0CONF_FORCE; |
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288 | |
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289 | #if defined(TRACE) |
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290 | printk("beagle_spi_read_write_bytes done\r\n"); |
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291 | #endif |
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292 | |
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293 | return len; |
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294 | } |
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295 | |
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296 | /* |
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297 | * Receive some bytes from SPI device |
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298 | * |
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299 | * Returns: number of bytes received or (negative) error code |
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300 | */ |
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301 | int beagle_spi_read_bytes |
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302 | ( |
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303 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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304 | unsigned char *buf, /* buffer to store bytes */ |
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305 | int len /* number of bytes to receive */ |
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306 | ) |
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307 | { |
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308 | // FIXME |
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309 | #if defined(DEBUG) |
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310 | printk("beagle_spi_read_bytes called...\r\n"); |
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311 | #endif |
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312 | |
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313 | int n = beagle_spi_read_write_bytes(bh, buf, NULL, len); |
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314 | |
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315 | #if defined(DEBUG) |
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316 | printk("beagle_spi_read_bytes done\r\n"); |
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317 | #endif |
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318 | |
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319 | return n; |
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320 | } |
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321 | |
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322 | /* |
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323 | * Send some bytes to SPI device |
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324 | * |
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325 | * Returns: number of bytes sent or (negative) error code |
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326 | */ |
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327 | int beagle_spi_write_bytes |
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328 | ( |
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329 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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330 | unsigned char *buf, /* buffer to send */ |
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331 | int len /* number of bytes to send */ |
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332 | ) |
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333 | { |
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334 | #if defined(DEBUG) |
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335 | printk("beagle_spi_write_bytes called...\r\n"); |
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336 | #endif |
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337 | |
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338 | int n = beagle_spi_read_write_bytes(bh, NULL, buf, len); |
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339 | |
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340 | #if defined(DEBUG) |
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341 | printk("beagle_spi_write_bytes done\r\n"); |
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342 | #endif |
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343 | |
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344 | return n; |
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345 | } |
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346 | |
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347 | /* |
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348 | * Perform selected ioctl function for SPI |
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349 | * |
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350 | * Returns: rtems_status_code |
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351 | */ |
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352 | int beagle_spi_ioctl |
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353 | ( |
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354 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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355 | int cmd, /* ioctl command code */ |
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356 | void *arg /* additional argument array */ |
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357 | ) |
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358 | { |
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359 | int ret_val = -1; |
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360 | |
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361 | #if defined(DEBUG) |
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362 | printk("beagle_spi_ioctl called...\r\n"); |
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363 | #endif |
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364 | |
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365 | switch(cmd) { // FIXME: other ioctls |
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366 | case RTEMS_LIBI2C_IOCTL_SET_TFRMODE: |
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367 | #if defined(TRACE) |
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368 | printk("cmd == RTEMS_LIBI2C_IOCTL_SET_TFRMODE\r\n"); |
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369 | #endif |
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370 | // FIXME |
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371 | // ret_val = |
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372 | // -m360_spi_set_tfr_mode(bh, |
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373 | // (const rtems_libi2c_tfr_mode_t *)arg); |
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374 | break; |
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375 | case RTEMS_LIBI2C_IOCTL_READ_WRITE: { |
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376 | #if defined(TRACE) |
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377 | printk("cmd == RTEMS_LIBI2C_IOCTL_READ_WRITE\r\n"); |
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378 | #endif |
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379 | const rtems_libi2c_read_write_t *cmd = (const rtems_libi2c_read_write_t *)arg; |
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380 | |
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381 | ret_val = beagle_spi_read_write_bytes( |
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382 | bh, |
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383 | (unsigned char *)cmd->rd_buf, |
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384 | (unsigned char *)cmd->wr_buf, |
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385 | cmd->byte_cnt |
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386 | ); |
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387 | break; |
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388 | } |
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389 | default: |
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390 | ret_val = -RTEMS_NOT_DEFINED; |
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391 | break; |
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392 | } |
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393 | |
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394 | #if defined(DEBUG) |
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395 | printk("beagle_spi_ioctl done\r\n"); |
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396 | #endif |
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397 | |
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398 | return ret_val; |
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399 | } |
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400 | |
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401 | /*=========================================================================*\ |
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402 | | Board-specific adaptation functions | |
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403 | \*=========================================================================*/ |
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404 | |
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405 | /* |
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406 | * Address a slave device on the bus |
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407 | * |
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408 | * Returns: o = ok or error code |
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409 | */ |
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410 | static rtems_status_code bsp_spi_sel_addr |
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411 | ( |
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412 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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413 | uint32_t addr, /* address to send on bus */ |
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414 | int rw /* 0=write,1=read */ |
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415 | ) |
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416 | { |
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417 | if (addr != 0) |
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418 | return RTEMS_NOT_IMPLEMENTED; |
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419 | |
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420 | return RTEMS_SUCCESSFUL; |
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421 | } |
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422 | |
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423 | /* |
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424 | * Dummy function, SPI has no start condition |
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425 | * |
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426 | * Returns: o = ok or error code |
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427 | */ |
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428 | static rtems_status_code bsp_spi_send_start_dummy |
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429 | ( |
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430 | rtems_libi2c_bus_t *bh /* bus specifier structure */ |
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431 | ) |
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432 | { |
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433 | #if defined(DEBUG) |
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434 | printk("bsp_spi_send_start_dummy OK\r\n"); |
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435 | #endif |
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436 | |
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437 | return 0; |
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438 | } |
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439 | |
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440 | /* |
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441 | * Deselect SPI |
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442 | * |
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443 | * Returns: o = ok or error code |
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444 | */ |
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445 | static rtems_status_code bsp_spi_send_stop |
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446 | ( |
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447 | rtems_libi2c_bus_t *bh /* bus specifier structure */ |
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448 | ) |
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449 | { |
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450 | #if defined(DEBUG) |
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451 | printk("bsp_spi_send_stop called... "); |
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452 | #endif |
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453 | |
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454 | // FIXME |
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455 | |
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456 | #if defined(DEBUG) |
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457 | printk("... exit OK\r\n"); |
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458 | #endif |
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459 | return 0; |
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460 | } |
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461 | |
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462 | /*=========================================================================*\ |
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463 | | list of handlers | |
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464 | \*=========================================================================*/ |
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465 | |
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466 | rtems_libi2c_bus_ops_t bsp_spi_ops = { |
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467 | init: beagle_spi_init, |
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468 | send_start: bsp_spi_send_start_dummy, |
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469 | send_stop: bsp_spi_send_stop, |
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470 | send_addr: bsp_spi_sel_addr, |
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471 | read_bytes: beagle_spi_read_bytes, |
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472 | write_bytes: beagle_spi_write_bytes, |
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473 | ioctl: beagle_spi_ioctl |
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474 | }; |
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475 | |
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476 | static beagle_spi_desc_t bsp_spi_bus_desc = { |
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477 | {/* public fields */ |
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478 | ops: &bsp_spi_ops, |
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479 | size: sizeof(bsp_spi_bus_desc) |
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480 | }, |
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481 | { /* our private fields */ |
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482 | initialized: FALSE, |
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483 | } |
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484 | }; |
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485 | |
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486 | /*=========================================================================*\ |
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487 | | initialization | |
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488 | \*=========================================================================*/ |
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489 | |
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490 | /* |
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491 | * Register SPI bus and devices |
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492 | * |
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493 | * Returns: Bus number or error code |
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494 | */ |
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495 | rtems_status_code bsp_register_spi |
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496 | ( |
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497 | const char *bus_path, |
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498 | uintptr_t register_base, |
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499 | rtems_vector_number irq |
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500 | ) |
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501 | { |
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502 | int ret_code; |
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503 | int spi_busno; |
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504 | |
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505 | beagle_spi_softc_t *softc_ptr = &bsp_spi_bus_desc.softc; |
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506 | |
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507 | if (softc_ptr->initialized) { |
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508 | printk("ERROR: Only one SPI bus at a time is supported\n"); |
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509 | return -RTEMS_RESOURCE_IN_USE; |
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510 | } |
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511 | |
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512 | softc_ptr->regs_base = register_base; |
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513 | softc_ptr->irq = irq; |
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514 | |
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515 | /* |
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516 | * init I2C library (if not already done) |
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517 | */ |
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518 | rtems_libi2c_initialize(); |
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519 | |
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520 | /* |
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521 | * register SPI bus |
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522 | */ |
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523 | ret_code = rtems_libi2c_register_bus(bus_path, |
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524 | &(bsp_spi_bus_desc.bus_desc)); |
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525 | if (ret_code < 0) { |
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526 | return -ret_code; |
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527 | } |
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528 | spi_busno = ret_code; |
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529 | |
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530 | #if IS_AM335X |
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531 | // TODO: register board devices |
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532 | #endif |
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533 | |
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534 | return spi_busno; |
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535 | } |
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