1 /* 2 * COM1 NS16550 support 3 * originally from linux source (arch/powerpc/boot/ns16550.c) 4 * modified to use CONFIG_SYS_ISA_MEM and new defines 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <errno.h> 10 #include <fdtdec.h> 11 #include <ns16550.h> 12 #include <serial.h> 13 #include <watchdog.h> 14 #include <linux/types.h> 15 #include <asm/io.h> 16 17 DECLARE_GLOBAL_DATA_PTR; 18 19 #define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */ 20 #define UART_MCRVAL (UART_MCR_DTR | \ 21 UART_MCR_RTS) /* RTS/DTR */ 22 #define UART_FCRVAL (UART_FCR_FIFO_EN | \ 23 UART_FCR_RXSR | \ 24 UART_FCR_TXSR) /* Clear & enable FIFOs */ 25 26 #ifndef CONFIG_DM_SERIAL 27 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED 28 #define serial_out(x, y) outb(x, (ulong)y) 29 #define serial_in(y) inb((ulong)y) 30 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0) 31 #define serial_out(x, y) out_be32(y, x) 32 #define serial_in(y) in_be32(y) 33 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0) 34 #define serial_out(x, y) out_le32(y, x) 35 #define serial_in(y) in_le32(y) 36 #else 37 #define serial_out(x, y) writeb(x, y) 38 #define serial_in(y) readb(y) 39 #endif 40 #endif /* !CONFIG_DM_SERIAL */ 41 42 #if defined(CONFIG_SOC_KEYSTONE) 43 #define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0 44 #define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) | (1 << 13) | (1 << 0)) 45 #undef UART_MCRVAL 46 #ifdef CONFIG_SERIAL_HW_FLOW_CONTROL 47 #define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE) 48 #else 49 #define UART_MCRVAL (UART_MCR_RTS) 50 #endif 51 #endif 52 53 #ifndef CONFIG_SYS_NS16550_IER 54 #define CONFIG_SYS_NS16550_IER 0x00 55 #endif /* CONFIG_SYS_NS16550_IER */ 56 57 #ifdef CONFIG_DM_SERIAL 58 static void ns16550_writeb(NS16550_t port, int offset, int value) 59 { 60 struct ns16550_platdata *plat = port->plat; 61 unsigned char *addr; 62 63 offset *= 1 << plat->reg_shift; 64 addr = map_sysmem(plat->base, 0) + offset; 65 /* 66 * As far as we know it doesn't make sense to support selection of 67 * these options at run-time, so use the existing CONFIG options. 68 */ 69 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED 70 outb(value, (ulong)addr); 71 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN) 72 out_le32(addr, value); 73 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN) 74 out_be32(addr, value); 75 #elif defined(CONFIG_SYS_BIG_ENDIAN) 76 writeb(value, addr + (1 << plat->reg_shift) - 1); 77 #else 78 writeb(value, addr); 79 #endif 80 } 81 82 static int ns16550_readb(NS16550_t port, int offset) 83 { 84 struct ns16550_platdata *plat = port->plat; 85 unsigned char *addr; 86 87 offset *= 1 << plat->reg_shift; 88 addr = map_sysmem(plat->base, 0) + offset; 89 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED 90 return inb((ulong)addr); 91 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN) 92 return in_le32(addr); 93 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN) 94 return in_be32(addr); 95 #elif defined(CONFIG_SYS_BIG_ENDIAN) 96 return readb(addr + (1 << plat->reg_shift) - 1); 97 #else 98 return readb(addr); 99 #endif 100 } 101 102 /* We can clean these up once everything is moved to driver model */ 103 #define serial_out(value, addr) \ 104 ns16550_writeb(com_port, addr - (unsigned char *)com_port, value) 105 #define serial_in(addr) \ 106 ns16550_readb(com_port, addr - (unsigned char *)com_port) 107 #endif 108 109 int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate) 110 { 111 const unsigned int mode_x_div = 16; 112 113 #ifdef CONFIG_OMAP1510 114 /* If can't cleanly clock 115200 set div to 1 */ 115 if ((clock == 12000000) && (baudrate == 115200)) { 116 port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */ 117 return 1; /* return 1 for base divisor */ 118 } 119 port->osc_12m_sel = 0; /* clear if previsouly set */ 120 #endif 121 122 return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate); 123 } 124 125 static void NS16550_setbrg(NS16550_t com_port, int baud_divisor) 126 { 127 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 128 serial_out(baud_divisor & 0xff, &com_port->dll); 129 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 130 serial_out(UART_LCRVAL, &com_port->lcr); 131 } 132 133 void NS16550_init(NS16550_t com_port, int baud_divisor) 134 { 135 #if (defined(CONFIG_SPL_BUILD) && \ 136 (defined(CONFIG_OMAP34XX) || defined(CONFIG_OMAP44XX))) 137 /* 138 * On some OMAP3/OMAP4 devices when UART3 is configured for boot mode 139 * before SPL starts only THRE bit is set. We have to empty the 140 * transmitter before initialization starts. 141 */ 142 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE)) 143 == UART_LSR_THRE) { 144 if (baud_divisor != -1) 145 NS16550_setbrg(com_port, baud_divisor); 146 serial_out(0, &com_port->mdr1); 147 } 148 #endif 149 150 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT)) 151 ; 152 153 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 154 #if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \ 155 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX) 156 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/ 157 #endif 158 NS16550_setbrg(com_port, 0); 159 serial_out(UART_MCRVAL, &com_port->mcr); 160 serial_out(UART_FCRVAL, &com_port->fcr); 161 if (baud_divisor != -1) 162 NS16550_setbrg(com_port, baud_divisor); 163 #if defined(CONFIG_OMAP) || \ 164 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \ 165 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX) 166 167 /* /16 is proper to hit 115200 with 48MHz */ 168 serial_out(0, &com_port->mdr1); 169 #endif /* CONFIG_OMAP */ 170 #if defined(CONFIG_SOC_KEYSTONE) 171 serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC); 172 #endif 173 } 174 175 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 176 void NS16550_reinit(NS16550_t com_port, int baud_divisor) 177 { 178 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 179 NS16550_setbrg(com_port, 0); 180 serial_out(UART_MCRVAL, &com_port->mcr); 181 serial_out(UART_FCRVAL, &com_port->fcr); 182 NS16550_setbrg(com_port, baud_divisor); 183 } 184 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 185 186 void NS16550_putc(NS16550_t com_port, char c) 187 { 188 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0) 189 ; 190 serial_out(c, &com_port->thr); 191 192 /* 193 * Call watchdog_reset() upon newline. This is done here in putc 194 * since the environment code uses a single puts() to print the complete 195 * environment upon "printenv". So we can't put this watchdog call 196 * in puts(). 197 */ 198 if (c == '\n') 199 WATCHDOG_RESET(); 200 } 201 202 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 203 char NS16550_getc(NS16550_t com_port) 204 { 205 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) { 206 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY) 207 extern void usbtty_poll(void); 208 usbtty_poll(); 209 #endif 210 WATCHDOG_RESET(); 211 } 212 return serial_in(&com_port->rbr); 213 } 214 215 int NS16550_tstc(NS16550_t com_port) 216 { 217 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0; 218 } 219 220 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 221 222 #ifdef CONFIG_DM_SERIAL 223 static int ns16550_serial_putc(struct udevice *dev, const char ch) 224 { 225 struct NS16550 *const com_port = dev_get_priv(dev); 226 227 if (!(serial_in(&com_port->lsr) & UART_LSR_THRE)) 228 return -EAGAIN; 229 serial_out(ch, &com_port->thr); 230 231 /* 232 * Call watchdog_reset() upon newline. This is done here in putc 233 * since the environment code uses a single puts() to print the complete 234 * environment upon "printenv". So we can't put this watchdog call 235 * in puts(). 236 */ 237 if (ch == '\n') 238 WATCHDOG_RESET(); 239 240 return 0; 241 } 242 243 static int ns16550_serial_pending(struct udevice *dev, bool input) 244 { 245 struct NS16550 *const com_port = dev_get_priv(dev); 246 247 if (input) 248 return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0; 249 else 250 return serial_in(&com_port->lsr) & UART_LSR_THRE ? 0 : 1; 251 } 252 253 static int ns16550_serial_getc(struct udevice *dev) 254 { 255 struct NS16550 *const com_port = dev_get_priv(dev); 256 257 if (!(serial_in(&com_port->lsr) & UART_LSR_DR)) 258 return -EAGAIN; 259 260 return serial_in(&com_port->rbr); 261 } 262 263 static int ns16550_serial_setbrg(struct udevice *dev, int baudrate) 264 { 265 struct NS16550 *const com_port = dev_get_priv(dev); 266 struct ns16550_platdata *plat = com_port->plat; 267 int clock_divisor; 268 269 clock_divisor = ns16550_calc_divisor(com_port, plat->clock, baudrate); 270 271 NS16550_setbrg(com_port, clock_divisor); 272 273 return 0; 274 } 275 276 int ns16550_serial_probe(struct udevice *dev) 277 { 278 struct NS16550 *const com_port = dev_get_priv(dev); 279 280 com_port->plat = dev_get_platdata(dev); 281 NS16550_init(com_port, -1); 282 283 return 0; 284 } 285 286 #ifdef CONFIG_OF_CONTROL 287 int ns16550_serial_ofdata_to_platdata(struct udevice *dev) 288 { 289 struct ns16550_platdata *plat = dev->platdata; 290 fdt_addr_t addr; 291 292 addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg"); 293 if (addr == FDT_ADDR_T_NONE) 294 return -EINVAL; 295 296 plat->base = addr; 297 plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset, 298 "reg-shift", 1); 299 300 return 0; 301 } 302 #endif 303 304 const struct dm_serial_ops ns16550_serial_ops = { 305 .putc = ns16550_serial_putc, 306 .pending = ns16550_serial_pending, 307 .getc = ns16550_serial_getc, 308 .setbrg = ns16550_serial_setbrg, 309 }; 310 #endif /* CONFIG_DM_SERIAL */ 311