1 #include "qemu/osdep.h" 2 #include "hw/hw.h" 3 #include "hw/sh4/sh.h" 4 #include "hw/loader.h" 5 #include "sysemu/qtest.h" 6 #include "qemu/error-report.h" 7 8 #define CE1 0x0100 9 #define CE2 0x0200 10 #define RE 0x0400 11 #define WE 0x0800 12 #define ALE 0x1000 13 #define CLE 0x2000 14 #define RDY1 0x4000 15 #define RDY2 0x8000 16 #define RDY(n) ((n) == 0 ? RDY1 : RDY2) 17 18 typedef enum { WAIT, READ1, READ2, READ3 } state_t; 19 20 typedef struct { 21 uint8_t *flash_contents; 22 state_t state; 23 uint32_t address; 24 uint8_t address_cycle; 25 } tc58128_dev; 26 27 static tc58128_dev tc58128_devs[2]; 28 29 #define FLASH_SIZE (16*1024*1024) 30 31 static void init_dev(tc58128_dev * dev, const char *filename) 32 { 33 int ret, blocks; 34 35 dev->state = WAIT; 36 dev->flash_contents = g_malloc(FLASH_SIZE); 37 memset(dev->flash_contents, 0xff, FLASH_SIZE); 38 if (filename) { 39 /* Load flash image skipping the first block */ 40 ret = load_image(filename, dev->flash_contents + 528 * 32); 41 if (ret < 0) { 42 if (!qtest_enabled()) { 43 error_report("Could not load flash image %s", filename); 44 exit(1); 45 } 46 } else { 47 /* Build first block with number of blocks */ 48 blocks = (ret + 528 * 32 - 1) / (528 * 32); 49 dev->flash_contents[0] = blocks & 0xff; 50 dev->flash_contents[1] = (blocks >> 8) & 0xff; 51 dev->flash_contents[2] = (blocks >> 16) & 0xff; 52 dev->flash_contents[3] = (blocks >> 24) & 0xff; 53 fprintf(stderr, "loaded %d bytes for %s into flash\n", ret, 54 filename); 55 } 56 } 57 } 58 59 static void handle_command(tc58128_dev * dev, uint8_t command) 60 { 61 switch (command) { 62 case 0xff: 63 fprintf(stderr, "reset flash device\n"); 64 dev->state = WAIT; 65 break; 66 case 0x00: 67 fprintf(stderr, "read mode 1\n"); 68 dev->state = READ1; 69 dev->address_cycle = 0; 70 break; 71 case 0x01: 72 fprintf(stderr, "read mode 2\n"); 73 dev->state = READ2; 74 dev->address_cycle = 0; 75 break; 76 case 0x50: 77 fprintf(stderr, "read mode 3\n"); 78 dev->state = READ3; 79 dev->address_cycle = 0; 80 break; 81 default: 82 fprintf(stderr, "unknown flash command 0x%02x\n", command); 83 abort(); 84 } 85 } 86 87 static void handle_address(tc58128_dev * dev, uint8_t data) 88 { 89 switch (dev->state) { 90 case READ1: 91 case READ2: 92 case READ3: 93 switch (dev->address_cycle) { 94 case 0: 95 dev->address = data; 96 if (dev->state == READ2) 97 dev->address |= 0x100; 98 else if (dev->state == READ3) 99 dev->address |= 0x200; 100 break; 101 case 1: 102 dev->address += data * 528 * 0x100; 103 break; 104 case 2: 105 dev->address += data * 528; 106 fprintf(stderr, "address pointer in flash: 0x%08x\n", 107 dev->address); 108 break; 109 default: 110 /* Invalid data */ 111 abort(); 112 } 113 dev->address_cycle++; 114 break; 115 default: 116 abort(); 117 } 118 } 119 120 static uint8_t handle_read(tc58128_dev * dev) 121 { 122 #if 0 123 if (dev->address % 0x100000 == 0) 124 fprintf(stderr, "reading flash at address 0x%08x\n", dev->address); 125 #endif 126 return dev->flash_contents[dev->address++]; 127 } 128 129 /* We never mark the device as busy, so interrupts cannot be triggered 130 XXXXX */ 131 132 static int tc58128_cb(uint16_t porta, uint16_t portb, 133 uint16_t * periph_pdtra, uint16_t * periph_portadir, 134 uint16_t * periph_pdtrb, uint16_t * periph_portbdir) 135 { 136 int dev; 137 138 if ((porta & CE1) == 0) 139 dev = 0; 140 else if ((porta & CE2) == 0) 141 dev = 1; 142 else 143 return 0; /* No device selected */ 144 145 if ((porta & RE) && (porta & WE)) { 146 /* Nothing to do, assert ready and return to input state */ 147 *periph_portadir &= 0xff00; 148 *periph_portadir |= RDY(dev); 149 *periph_pdtra |= RDY(dev); 150 return 1; 151 } 152 153 if (porta & CLE) { 154 /* Command */ 155 assert((porta & WE) == 0); 156 handle_command(&tc58128_devs[dev], porta & 0x00ff); 157 } else if (porta & ALE) { 158 assert((porta & WE) == 0); 159 handle_address(&tc58128_devs[dev], porta & 0x00ff); 160 } else if ((porta & RE) == 0) { 161 *periph_portadir |= 0x00ff; 162 *periph_pdtra &= 0xff00; 163 *periph_pdtra |= handle_read(&tc58128_devs[dev]); 164 } else { 165 abort(); 166 } 167 return 1; 168 } 169 170 static sh7750_io_device tc58128 = { 171 RE | WE, /* Port A triggers */ 172 0, /* Port B triggers */ 173 tc58128_cb /* Callback */ 174 }; 175 176 int tc58128_init(struct SH7750State *s, const char *zone1, const char *zone2) 177 { 178 init_dev(&tc58128_devs[0], zone1); 179 init_dev(&tc58128_devs[1], zone2); 180 return sh7750_register_io_device(s, &tc58128); 181 } 182