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 #ifdef CONFIG_DM_SERIAL
59 static inline void serial_out_shift(void *addr, int shift, int value)
61 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
62 outb(value, (ulong)addr);
63 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
64 out_le32(addr, value);
65 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
66 out_be32(addr, value);
67 #elif defined(CONFIG_SYS_NS16550_MEM32)
69 #elif defined(CONFIG_SYS_BIG_ENDIAN)
70 writeb(value, addr + (1 << shift) - 1);
76 static inline int serial_in_shift(void *addr, int shift)
78 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
79 return inb((ulong)addr);
80 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
82 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
84 #elif defined(CONFIG_SYS_NS16550_MEM32)
86 #elif defined(CONFIG_SYS_BIG_ENDIAN)
87 return readb(addr + (1 << shift) - 1);
93 static void ns16550_writeb(NS16550_t port, int offset, int value)
95 struct ns16550_platdata *plat = port->plat;
98 offset *= 1 << plat->reg_shift;
99 addr = map_physmem(plat->base, 0, MAP_NOCACHE) + offset;
101 * As far as we know it doesn't make sense to support selection of
102 * these options at run-time, so use the existing CONFIG options.
104 serial_out_shift(addr, plat->reg_shift, value);
107 static int ns16550_readb(NS16550_t port, int offset)
109 struct ns16550_platdata *plat = port->plat;
112 offset *= 1 << plat->reg_shift;
113 addr = map_physmem(plat->base, 0, MAP_NOCACHE) + offset;
115 return serial_in_shift(addr, plat->reg_shift);
118 /* We can clean these up once everything is moved to driver model */
119 #define serial_out(value, addr) \
120 ns16550_writeb(com_port, \
121 (unsigned char *)addr - (unsigned char *)com_port, value)
122 #define serial_in(addr) \
123 ns16550_readb(com_port, \
124 (unsigned char *)addr - (unsigned char *)com_port)
127 static inline int calc_divisor(NS16550_t port, int clock, int baudrate)
129 const unsigned int mode_x_div = 16;
131 return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate);
134 int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
136 #ifdef CONFIG_OMAP1510
137 /* If can't cleanly clock 115200 set div to 1 */
138 if ((clock == 12000000) && (baudrate == 115200)) {
139 port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */
140 return 1; /* return 1 for base divisor */
142 port->osc_12m_sel = 0; /* clear if previsouly set */
145 return calc_divisor(port, clock, baudrate);
148 static void NS16550_setbrg(NS16550_t com_port, int baud_divisor)
150 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
151 serial_out(baud_divisor & 0xff, &com_port->dll);
152 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
153 serial_out(UART_LCRVAL, &com_port->lcr);
156 void NS16550_init(NS16550_t com_port, int baud_divisor)
158 #if (defined(CONFIG_SPL_BUILD) && \
159 (defined(CONFIG_OMAP34XX) || defined(CONFIG_OMAP44XX)))
161 * On some OMAP3/OMAP4 devices when UART3 is configured for boot mode
162 * before SPL starts only THRE bit is set. We have to empty the
163 * transmitter before initialization starts.
165 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE))
167 if (baud_divisor != -1)
168 NS16550_setbrg(com_port, baud_divisor);
169 serial_out(0, &com_port->mdr1);
173 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
176 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
177 #if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \
178 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
179 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
181 serial_out(UART_MCRVAL, &com_port->mcr);
182 serial_out(UART_FCRVAL, &com_port->fcr);
183 if (baud_divisor != -1)
184 NS16550_setbrg(com_port, baud_divisor);
185 #if defined(CONFIG_OMAP) || \
186 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \
187 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
189 /* /16 is proper to hit 115200 with 48MHz */
190 serial_out(0, &com_port->mdr1);
191 #endif /* CONFIG_OMAP */
192 #if defined(CONFIG_SOC_KEYSTONE)
193 serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC);
197 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
198 void NS16550_reinit(NS16550_t com_port, int baud_divisor)
200 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
201 NS16550_setbrg(com_port, 0);
202 serial_out(UART_MCRVAL, &com_port->mcr);
203 serial_out(UART_FCRVAL, &com_port->fcr);
204 NS16550_setbrg(com_port, baud_divisor);
206 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
208 void NS16550_putc(NS16550_t com_port, char c)
210 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
212 serial_out(c, &com_port->thr);
215 * Call watchdog_reset() upon newline. This is done here in putc
216 * since the environment code uses a single puts() to print the complete
217 * environment upon "printenv". So we can't put this watchdog call
224 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
225 char NS16550_getc(NS16550_t com_port)
227 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
228 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
229 extern void usbtty_poll(void);
234 return serial_in(&com_port->rbr);
237 int NS16550_tstc(NS16550_t com_port)
239 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
242 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
244 #ifdef CONFIG_DEBUG_UART_NS16550
246 #include <debug_uart.h>
248 #define serial_dout(reg, value) \
249 serial_out_shift((char *)com_port + \
250 ((char *)reg - (char *)com_port) * \
251 (1 << CONFIG_DEBUG_UART_SHIFT), \
252 CONFIG_DEBUG_UART_SHIFT, value)
253 #define serial_din(reg) \
254 serial_in_shift((char *)com_port + \
255 ((char *)reg - (char *)com_port) * \
256 (1 << CONFIG_DEBUG_UART_SHIFT), \
257 CONFIG_DEBUG_UART_SHIFT)
259 static inline void _debug_uart_init(void)
261 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
265 * We copy the code from above because it is already horribly messy.
266 * Trying to refactor to nicely remove the duplication doesn't seem
267 * feasible. The better fix is to move all users of this driver to
270 baud_divisor = calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
272 serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
273 serial_dout(&com_port->mcr, UART_MCRVAL);
274 serial_dout(&com_port->fcr, UART_FCRVAL);
276 serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
277 serial_dout(&com_port->dll, baud_divisor & 0xff);
278 serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
279 serial_dout(&com_port->lcr, UART_LCRVAL);
282 static inline void _debug_uart_putc(int ch)
284 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
286 while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
288 serial_dout(&com_port->thr, ch);
295 #ifdef CONFIG_DM_SERIAL
296 static int ns16550_serial_putc(struct udevice *dev, const char ch)
298 struct NS16550 *const com_port = dev_get_priv(dev);
300 if (!(serial_in(&com_port->lsr) & UART_LSR_THRE))
302 serial_out(ch, &com_port->thr);
305 * Call watchdog_reset() upon newline. This is done here in putc
306 * since the environment code uses a single puts() to print the complete
307 * environment upon "printenv". So we can't put this watchdog call
316 static int ns16550_serial_pending(struct udevice *dev, bool input)
318 struct NS16550 *const com_port = dev_get_priv(dev);
321 return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0;
323 return serial_in(&com_port->lsr) & UART_LSR_THRE ? 0 : 1;
326 static int ns16550_serial_getc(struct udevice *dev)
328 struct NS16550 *const com_port = dev_get_priv(dev);
330 if (!(serial_in(&com_port->lsr) & UART_LSR_DR))
333 return serial_in(&com_port->rbr);
336 static int ns16550_serial_setbrg(struct udevice *dev, int baudrate)
338 struct NS16550 *const com_port = dev_get_priv(dev);
339 struct ns16550_platdata *plat = com_port->plat;
342 clock_divisor = ns16550_calc_divisor(com_port, plat->clock, baudrate);
344 NS16550_setbrg(com_port, clock_divisor);
349 int ns16550_serial_probe(struct udevice *dev)
351 struct NS16550 *const com_port = dev_get_priv(dev);
353 com_port->plat = dev_get_platdata(dev);
354 NS16550_init(com_port, -1);
359 #if CONFIG_IS_ENABLED(OF_CONTROL)
360 int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
362 struct ns16550_platdata *plat = dev->platdata;
365 /* try Processor Local Bus device first */
366 addr = dev_get_addr(dev);
368 if (addr == FDT_ADDR_T_NONE) {
369 /* then try pci device */
370 struct fdt_pci_addr pci_addr;
374 /* we prefer to use a memory-mapped register */
375 ret = fdtdec_get_pci_addr(gd->fdt_blob, dev->of_offset,
376 FDT_PCI_SPACE_MEM32, "reg",
379 /* try if there is any i/o-mapped register */
380 ret = fdtdec_get_pci_addr(gd->fdt_blob,
388 ret = fdtdec_get_pci_bar32(gd->fdt_blob, dev->of_offset,
397 if (addr == FDT_ADDR_T_NONE)
401 plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
408 const struct dm_serial_ops ns16550_serial_ops = {
409 .putc = ns16550_serial_putc,
410 .pending = ns16550_serial_pending,
411 .getc = ns16550_serial_getc,
412 .setbrg = ns16550_serial_setbrg,
414 #endif /* CONFIG_DM_SERIAL */