3 * originally from linux source (arch/powerpc/boot/ns16550.c)
4 * modified to use CONFIG_SYS_ISA_MEM and new defines
14 #include <linux/types.h>
17 DECLARE_GLOBAL_DATA_PTR;
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 | \
24 UART_FCR_TXSR) /* Clear & enable FIFOs */
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)
37 #define serial_out(x, y) writeb(x, y)
38 #define serial_in(y) readb(y)
40 #endif /* !CONFIG_DM_SERIAL */
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))
46 #ifdef CONFIG_SERIAL_HW_FLOW_CONTROL
47 #define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE)
49 #define UART_MCRVAL (UART_MCR_RTS)
53 #ifndef CONFIG_SYS_NS16550_IER
54 #define CONFIG_SYS_NS16550_IER 0x00
55 #endif /* CONFIG_SYS_NS16550_IER */
57 static inline void serial_out_shift(void *addr, int shift, int value)
59 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
60 outb(value, (ulong)addr);
61 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
62 out_le32(addr, value);
63 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
64 out_be32(addr, value);
65 #elif defined(CONFIG_SYS_NS16550_MEM32)
67 #elif defined(CONFIG_SYS_BIG_ENDIAN)
68 writeb(value, addr + (1 << shift) - 1);
74 static inline int serial_in_shift(void *addr, int shift)
76 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
77 return inb((ulong)addr);
78 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
80 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
82 #elif defined(CONFIG_SYS_NS16550_MEM32)
84 #elif defined(CONFIG_SYS_BIG_ENDIAN)
85 return readb(addr + (1 << shift) - 1);
91 #ifdef CONFIG_DM_SERIAL
93 #ifndef CONFIG_SYS_NS16550_CLK
94 #define CONFIG_SYS_NS16550_CLK 0
97 static void ns16550_writeb(NS16550_t port, int offset, int value)
99 struct ns16550_platdata *plat = port->plat;
102 offset *= 1 << plat->reg_shift;
103 addr = (unsigned char *)plat->base + offset;
106 * As far as we know it doesn't make sense to support selection of
107 * these options at run-time, so use the existing CONFIG options.
109 serial_out_shift(addr + plat->reg_offset, plat->reg_shift, value);
112 static int ns16550_readb(NS16550_t port, int offset)
114 struct ns16550_platdata *plat = port->plat;
117 offset *= 1 << plat->reg_shift;
118 addr = (unsigned char *)plat->base + offset;
120 return serial_in_shift(addr + plat->reg_offset, plat->reg_shift);
123 /* We can clean these up once everything is moved to driver model */
124 #define serial_out(value, addr) \
125 ns16550_writeb(com_port, \
126 (unsigned char *)addr - (unsigned char *)com_port, value)
127 #define serial_in(addr) \
128 ns16550_readb(com_port, \
129 (unsigned char *)addr - (unsigned char *)com_port)
132 int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
134 const unsigned int mode_x_div = 16;
136 return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate);
139 static void NS16550_setbrg(NS16550_t com_port, int baud_divisor)
141 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
142 serial_out(baud_divisor & 0xff, &com_port->dll);
143 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
144 serial_out(UART_LCRVAL, &com_port->lcr);
147 void NS16550_init(NS16550_t com_port, int baud_divisor)
149 #if (defined(CONFIG_SPL_BUILD) && \
150 (defined(CONFIG_OMAP34XX) || defined(CONFIG_OMAP44XX)))
152 * On some OMAP3/OMAP4 devices when UART3 is configured for boot mode
153 * before SPL starts only THRE bit is set. We have to empty the
154 * transmitter before initialization starts.
156 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE))
158 if (baud_divisor != -1)
159 NS16550_setbrg(com_port, baud_divisor);
160 serial_out(0, &com_port->mdr1);
164 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
167 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
168 #if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \
169 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
170 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
172 serial_out(UART_MCRVAL, &com_port->mcr);
173 serial_out(UART_FCRVAL, &com_port->fcr);
174 if (baud_divisor != -1)
175 NS16550_setbrg(com_port, baud_divisor);
176 #if defined(CONFIG_OMAP) || \
177 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \
178 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
180 /* /16 is proper to hit 115200 with 48MHz */
181 serial_out(0, &com_port->mdr1);
182 #endif /* CONFIG_OMAP */
183 #if defined(CONFIG_SOC_KEYSTONE)
184 serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC);
188 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
189 void NS16550_reinit(NS16550_t com_port, int baud_divisor)
191 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
192 NS16550_setbrg(com_port, 0);
193 serial_out(UART_MCRVAL, &com_port->mcr);
194 serial_out(UART_FCRVAL, &com_port->fcr);
195 NS16550_setbrg(com_port, baud_divisor);
197 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
199 void NS16550_putc(NS16550_t com_port, char c)
201 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
203 serial_out(c, &com_port->thr);
206 * Call watchdog_reset() upon newline. This is done here in putc
207 * since the environment code uses a single puts() to print the complete
208 * environment upon "printenv". So we can't put this watchdog call
215 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
216 char NS16550_getc(NS16550_t com_port)
218 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
219 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
220 extern void usbtty_poll(void);
225 return serial_in(&com_port->rbr);
228 int NS16550_tstc(NS16550_t com_port)
230 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
233 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
235 #ifdef CONFIG_DEBUG_UART_NS16550
237 #include <debug_uart.h>
239 #define serial_dout(reg, value) \
240 serial_out_shift((char *)com_port + \
241 ((char *)reg - (char *)com_port) * \
242 (1 << CONFIG_DEBUG_UART_SHIFT), \
243 CONFIG_DEBUG_UART_SHIFT, value)
244 #define serial_din(reg) \
245 serial_in_shift((char *)com_port + \
246 ((char *)reg - (char *)com_port) * \
247 (1 << CONFIG_DEBUG_UART_SHIFT), \
248 CONFIG_DEBUG_UART_SHIFT)
250 static inline void _debug_uart_init(void)
252 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
256 * We copy the code from above because it is already horribly messy.
257 * Trying to refactor to nicely remove the duplication doesn't seem
258 * feasible. The better fix is to move all users of this driver to
261 baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
263 serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
264 serial_dout(&com_port->mcr, UART_MCRVAL);
265 serial_dout(&com_port->fcr, UART_FCRVAL);
267 serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
268 serial_dout(&com_port->dll, baud_divisor & 0xff);
269 serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
270 serial_dout(&com_port->lcr, UART_LCRVAL);
273 static inline void _debug_uart_putc(int ch)
275 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
277 while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
279 serial_dout(&com_port->thr, ch);
286 #ifdef CONFIG_DM_SERIAL
287 static int ns16550_serial_putc(struct udevice *dev, const char ch)
289 struct NS16550 *const com_port = dev_get_priv(dev);
291 if (!(serial_in(&com_port->lsr) & UART_LSR_THRE))
293 serial_out(ch, &com_port->thr);
296 * Call watchdog_reset() upon newline. This is done here in putc
297 * since the environment code uses a single puts() to print the complete
298 * environment upon "printenv". So we can't put this watchdog call
307 static int ns16550_serial_pending(struct udevice *dev, bool input)
309 struct NS16550 *const com_port = dev_get_priv(dev);
312 return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0;
314 return serial_in(&com_port->lsr) & UART_LSR_THRE ? 0 : 1;
317 static int ns16550_serial_getc(struct udevice *dev)
319 struct NS16550 *const com_port = dev_get_priv(dev);
321 if (!(serial_in(&com_port->lsr) & UART_LSR_DR))
324 return serial_in(&com_port->rbr);
327 static int ns16550_serial_setbrg(struct udevice *dev, int baudrate)
329 struct NS16550 *const com_port = dev_get_priv(dev);
330 struct ns16550_platdata *plat = com_port->plat;
333 clock_divisor = ns16550_calc_divisor(com_port, plat->clock, baudrate);
335 NS16550_setbrg(com_port, clock_divisor);
340 int ns16550_serial_probe(struct udevice *dev)
342 struct NS16550 *const com_port = dev_get_priv(dev);
344 com_port->plat = dev_get_platdata(dev);
345 NS16550_init(com_port, -1);
350 #if CONFIG_IS_ENABLED(OF_CONTROL)
351 int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
353 struct ns16550_platdata *plat = dev->platdata;
356 /* try Processor Local Bus device first */
357 addr = dev_get_addr(dev);
358 #if defined(CONFIG_PCI) && defined(CONFIG_DM_PCI)
359 if (addr == FDT_ADDR_T_NONE) {
360 /* then try pci device */
361 struct fdt_pci_addr pci_addr;
365 /* we prefer to use a memory-mapped register */
366 ret = fdtdec_get_pci_addr(gd->fdt_blob, dev->of_offset,
367 FDT_PCI_SPACE_MEM32, "reg",
370 /* try if there is any i/o-mapped register */
371 ret = fdtdec_get_pci_addr(gd->fdt_blob,
379 ret = fdtdec_get_pci_bar32(dev, &pci_addr, &bar);
387 if (addr == FDT_ADDR_T_NONE)
390 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
393 plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
396 plat->reg_offset = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
398 plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
400 plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
402 CONFIG_SYS_NS16550_CLK);
404 debug("ns16550 clock not defined\n");
412 const struct dm_serial_ops ns16550_serial_ops = {
413 .putc = ns16550_serial_putc,
414 .pending = ns16550_serial_pending,
415 .getc = ns16550_serial_getc,
416 .setbrg = ns16550_serial_setbrg,
419 #if CONFIG_IS_ENABLED(OF_CONTROL)
421 * Please consider existing compatible strings before adding a new
422 * one to keep this table compact. Or you may add a generic "ns16550"
423 * compatible string to your dts.
425 static const struct udevice_id ns16550_serial_ids[] = {
426 { .compatible = "ns16550" },
427 { .compatible = "ns16550a" },
428 { .compatible = "nvidia,tegra20-uart" },
429 { .compatible = "snps,dw-apb-uart" },
430 { .compatible = "ti,omap2-uart" },
431 { .compatible = "ti,omap3-uart" },
432 { .compatible = "ti,omap4-uart" },
433 { .compatible = "ti,am3352-uart" },
434 { .compatible = "ti,am4372-uart" },
435 { .compatible = "ti,dra742-uart" },
440 #if CONFIG_IS_ENABLED(SERIAL_PRESENT)
441 U_BOOT_DRIVER(ns16550_serial) = {
442 .name = "ns16550_serial",
444 #if CONFIG_IS_ENABLED(OF_CONTROL)
445 .of_match = ns16550_serial_ids,
446 .ofdata_to_platdata = ns16550_serial_ofdata_to_platdata,
447 .platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
449 .priv_auto_alloc_size = sizeof(struct NS16550),
450 .probe = ns16550_serial_probe,
451 .ops = &ns16550_serial_ops,
452 .flags = DM_FLAG_PRE_RELOC,
455 #endif /* CONFIG_DM_SERIAL */