| 1 | /* |
| 2 | * Broadcom Serial Controller (BSC) |
| 3 | * |
| 4 | * Copyright (c) 2024 Rayhan Faizel <rayhan.faizel@gmail.com> |
| 5 | * |
| 6 | * SPDX-License-Identifier: MIT |
| 7 | * |
| 8 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 9 | * of this software and associated documentation files (the "Software"), to deal |
| 10 | * in the Software without restriction, including without limitation the rights |
| 11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 12 | * copies of the Software, and to permit persons to whom the Software is |
| 13 | * furnished to do so, subject to the following conditions: |
| 14 | * |
| 15 | * The above copyright notice and this permission notice shall be included in |
| 16 | * all copies or substantial portions of the Software. |
| 17 | * |
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 21 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 24 | * THE SOFTWARE. |
| 25 | */ |
| 26 | |
| 27 | #include "hw/core/sysbus.h" |
| 28 | #include "hw/i2c/i2c.h" |
| 29 | #include "qom/object.h" |
| 30 | |
| 31 | #define TYPE_BCM2835_I2C "bcm2835-i2c" |
| 32 | OBJECT_DECLARE_SIMPLE_TYPE(BCM2835I2CState, BCM2835_I2C) |
| 33 | |
| 34 | #define BCM2835_I2C_C 0x0 /* Control */ |
| 35 | #define BCM2835_I2C_S 0x4 /* Status */ |
| 36 | #define BCM2835_I2C_DLEN 0x8 /* Data Length */ |
| 37 | #define BCM2835_I2C_A 0xc /* Slave Address */ |
| 38 | #define BCM2835_I2C_FIFO 0x10 /* FIFO */ |
| 39 | #define BCM2835_I2C_DIV 0x14 /* Clock Divider */ |
| 40 | #define BCM2835_I2C_DEL 0x18 /* Data Delay */ |
| 41 | #define BCM2835_I2C_CLKT 0x1c /* Clock Stretch Timeout */ |
| 42 | |
| 43 | #define BCM2835_I2C_C_I2CEN BIT(15) /* I2C enable */ |
| 44 | #define BCM2835_I2C_C_INTR BIT(10) /* Interrupt on RXR */ |
| 45 | #define BCM2835_I2C_C_INTT BIT(9) /* Interrupt on TXW */ |
| 46 | #define BCM2835_I2C_C_INTD BIT(8) /* Interrupt on DONE */ |
| 47 | #define BCM2835_I2C_C_ST BIT(7) /* Start transfer */ |
| 48 | #define BCM2835_I2C_C_CLEAR (BIT(5) | BIT(4)) /* Clear FIFO */ |
| 49 | #define BCM2835_I2C_C_READ BIT(0) /* I2C read mode */ |
| 50 | |
| 51 | #define BCM2835_I2C_S_CLKT BIT(9) /* Clock stretch timeout */ |
| 52 | #define BCM2835_I2C_S_ERR BIT(8) /* Slave error */ |
| 53 | #define BCM2835_I2C_S_RXF BIT(7) /* RX FIFO full */ |
| 54 | #define BCM2835_I2C_S_TXE BIT(6) /* TX FIFO empty */ |
| 55 | #define BCM2835_I2C_S_RXD BIT(5) /* RX bytes available */ |
| 56 | #define BCM2835_I2C_S_TXD BIT(4) /* TX space available */ |
| 57 | #define BCM2835_I2C_S_RXR BIT(3) /* RX FIFO needs reading */ |
| 58 | #define BCM2835_I2C_S_TXW BIT(2) /* TX FIFO needs writing */ |
| 59 | #define BCM2835_I2C_S_DONE BIT(1) /* I2C Transfer complete */ |
| 60 | #define BCM2835_I2C_S_TA BIT(0) /* I2C Transfer active */ |
| 61 | |
| 62 | struct BCM2835I2CState { |
| 63 | /* <private> */ |
| 64 | SysBusDevice parent_obj; |
| 65 | |
| 66 | /* <public> */ |
| 67 | MemoryRegion iomem; |
| 68 | I2CBus *bus; |
| 69 | qemu_irq irq; |
| 70 | |
| 71 | uint32_t c; |
| 72 | uint32_t s; |
| 73 | uint32_t dlen; |
| 74 | uint32_t a; |
| 75 | uint32_t div; |
| 76 | uint32_t del; |
| 77 | uint32_t clkt; |
| 78 | |
| 79 | uint32_t last_dlen; |
| 80 | }; |