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1 | jermar | 1 | /* |
3982 | jermar | 2 | * Copyright (c) 2009 Jakub Jermar |
1 | jermar | 3 | * All rights reserved. |
4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
4156 | trochtova | 29 | /** @addtogroup genarch |
1702 | cejka | 30 | * @{ |
31 | */ |
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1754 | jermar | 32 | /** |
1757 | jermar | 33 | * @file |
4156 | trochtova | 34 | * @brief Zilog 8530 serial controller driver. |
1702 | cejka | 35 | */ |
36 | |||
4042 | jermar | 37 | #include <genarch/drivers/z8530/z8530.h> |
511 | jermar | 38 | #include <console/chardev.h> |
3961 | jermar | 39 | #include <ddi/irq.h> |
40 | #include <arch/asm.h> |
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41 | #include <mm/slab.h> |
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4156 | trochtova | 42 | #include <ddi/device.h> |
1 | jermar | 43 | |
4156 | trochtova | 44 | static indev_operations_t kbrdin_ops = { |
45 | .poll = NULL |
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46 | }; |
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47 | |||
3961 | jermar | 48 | static inline void z8530_write(ioport8_t *ctl, uint8_t reg, uint8_t val) |
49 | { |
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50 | /* |
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51 | * Registers 8-15 will automatically issue the Point High |
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52 | * command as their bit 3 is 1. |
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53 | */ |
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4156 | trochtova | 54 | pio_write_8(ctl, reg); /* Select register */ |
55 | pio_write_8(ctl, val); /* Write value */ |
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3961 | jermar | 56 | } |
57 | |||
58 | static inline uint8_t z8530_read(ioport8_t *ctl, uint8_t reg) |
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59 | { |
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60 | /* |
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61 | * Registers 8-15 will automatically issue the Point High |
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62 | * command as their bit 3 is 1. |
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63 | */ |
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4156 | trochtova | 64 | pio_write_8(ctl, reg); /* Select register */ |
3961 | jermar | 65 | return pio_read_8(ctl); |
66 | } |
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67 | |||
4156 | trochtova | 68 | static irq_ownership_t z8530_claim(irq_t *irq) |
69 | { |
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70 | z8530_instance_t *instance = irq->instance; |
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71 | z8530_t *dev = instance->z8530; |
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72 | |||
73 | if (z8530_read(&dev->ctl_a, RR0) & RR0_RCA) |
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74 | return IRQ_ACCEPT; |
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75 | else |
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76 | return IRQ_DECLINE; |
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77 | } |
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78 | |||
79 | static void z8530_irq_handler(irq_t *irq) |
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80 | { |
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81 | z8530_instance_t *instance = irq->instance; |
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82 | z8530_t *dev = instance->z8530; |
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83 | |||
84 | if (z8530_read(&dev->ctl_a, RR0) & RR0_RCA) { |
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85 | uint8_t x = z8530_read(&dev->ctl_a, RR8); |
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86 | indev_push_character(&instance->kbrdin, x); |
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87 | } |
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88 | } |
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89 | |||
3961 | jermar | 90 | /** Initialize z8530. */ |
4156 | trochtova | 91 | indev_t *z8530_init(z8530_t *dev, inr_t inr, cir_t cir, void *cir_arg) |
1 | jermar | 92 | { |
4156 | trochtova | 93 | z8530_instance_t *instance |
94 | = malloc(sizeof(z8530_instance_t), FRAME_ATOMIC); |
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3961 | jermar | 95 | if (!instance) |
96 | return false; |
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4156 | trochtova | 97 | |
98 | indev_initialize("z8530", &instance->kbrdin, &kbrdin_ops); |
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99 | |||
3961 | jermar | 100 | instance->z8530 = dev; |
4156 | trochtova | 101 | |
3961 | jermar | 102 | irq_initialize(&instance->irq); |
4156 | trochtova | 103 | instance->irq.devno = device_assign_devno(); |
3961 | jermar | 104 | instance->irq.inr = inr; |
105 | instance->irq.claim = z8530_claim; |
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106 | instance->irq.handler = z8530_irq_handler; |
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107 | instance->irq.instance = instance; |
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108 | instance->irq.cir = cir; |
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109 | instance->irq.cir_arg = cir_arg; |
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110 | irq_register(&instance->irq); |
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4156 | trochtova | 111 | |
3961 | jermar | 112 | (void) z8530_read(&dev->ctl_a, RR8); |
4156 | trochtova | 113 | |
1925 | jermar | 114 | /* |
115 | * Clear any pending TX interrupts or we never manage |
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116 | * to set FHC UART interrupt state to idle. |
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117 | */ |
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3961 | jermar | 118 | z8530_write(&dev->ctl_a, WR0, WR0_TX_IP_RST); |
4156 | trochtova | 119 | |
3655 | jermar | 120 | /* interrupt on all characters */ |
3961 | jermar | 121 | z8530_write(&dev->ctl_a, WR1, WR1_IARCSC); |
4156 | trochtova | 122 | |
1925 | jermar | 123 | /* 8 bits per character and enable receiver */ |
3961 | jermar | 124 | z8530_write(&dev->ctl_a, WR3, WR3_RX8BITSCH | WR3_RX_ENABLE); |
1925 | jermar | 125 | |
3655 | jermar | 126 | /* Master Interrupt Enable. */ |
3961 | jermar | 127 | z8530_write(&dev->ctl_a, WR9, WR9_MIE); |
4156 | trochtova | 128 | |
129 | return &instance->kbrdin; |
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1 | jermar | 130 | } |
131 | |||
1754 | jermar | 132 | /** @} |
1702 | cejka | 133 | */ |