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(unsigned char *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_BIG_ENDIAN)
68 writeb(value, addr + (1 << shift) - 1);
74 static inline int serial_in_shift(unsigned char *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_BIG_ENDIAN)
83 return readb(addr + (1 << reg_shift) - 1);
89 static void ns16550_writeb(NS16550_t port, int offset, int value)
91 struct ns16550_platdata *plat = port->plat;
94 offset *= 1 << plat->reg_shift;
95 addr = map_sysmem(plat->base, 0) + offset;
97 * As far as we know it doesn't make sense to support selection of
98 * these options at run-time, so use the existing CONFIG options.
100 serial_out_shift(addr, plat->reg_shift, value);
103 static int ns16550_readb(NS16550_t port, int offset)
105 struct ns16550_platdata *plat = port->plat;
108 offset *= 1 << plat->reg_shift;
109 addr = map_sysmem(plat->base, 0) + offset;
111 return serial_in_shift(addr, plat->reg_shift);
114 /* We can clean these up once everything is moved to driver model */
115 #define serial_out(value, addr) \
116 ns16550_writeb(com_port, addr - (unsigned char *)com_port, value)
117 #define serial_in(addr) \
118 ns16550_readb(com_port, addr - (unsigned char *)com_port)
121 static inline int calc_divisor(NS16550_t port, int clock, int baudrate)
123 const unsigned int mode_x_div = 16;
125 return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate);
128 int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
130 #ifdef CONFIG_OMAP1510
131 /* If can't cleanly clock 115200 set div to 1 */
132 if ((clock == 12000000) && (baudrate == 115200)) {
133 port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */
134 return 1; /* return 1 for base divisor */
136 port->osc_12m_sel = 0; /* clear if previsouly set */
139 return calc_divisor(port, clock, baudrate);
142 static void NS16550_setbrg(NS16550_t com_port, int baud_divisor)
144 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
145 serial_out(baud_divisor & 0xff, &com_port->dll);
146 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
147 serial_out(UART_LCRVAL, &com_port->lcr);
150 void NS16550_init(NS16550_t com_port, int baud_divisor)
152 #if (defined(CONFIG_SPL_BUILD) && \
153 (defined(CONFIG_OMAP34XX) || defined(CONFIG_OMAP44XX)))
155 * On some OMAP3/OMAP4 devices when UART3 is configured for boot mode
156 * before SPL starts only THRE bit is set. We have to empty the
157 * transmitter before initialization starts.
159 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE))
161 if (baud_divisor != -1)
162 NS16550_setbrg(com_port, baud_divisor);
163 serial_out(0, &com_port->mdr1);
167 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
170 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
171 #if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \
172 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
173 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
175 NS16550_setbrg(com_port, 0);
176 serial_out(UART_MCRVAL, &com_port->mcr);
177 serial_out(UART_FCRVAL, &com_port->fcr);
178 if (baud_divisor != -1)
179 NS16550_setbrg(com_port, baud_divisor);
180 #if defined(CONFIG_OMAP) || \
181 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \
182 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
184 /* /16 is proper to hit 115200 with 48MHz */
185 serial_out(0, &com_port->mdr1);
186 #endif /* CONFIG_OMAP */
187 #if defined(CONFIG_SOC_KEYSTONE)
188 serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC);
192 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
193 void NS16550_reinit(NS16550_t com_port, int baud_divisor)
195 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
196 NS16550_setbrg(com_port, 0);
197 serial_out(UART_MCRVAL, &com_port->mcr);
198 serial_out(UART_FCRVAL, &com_port->fcr);
199 NS16550_setbrg(com_port, baud_divisor);
201 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
203 void NS16550_putc(NS16550_t com_port, char c)
205 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
207 serial_out(c, &com_port->thr);
210 * Call watchdog_reset() upon newline. This is done here in putc
211 * since the environment code uses a single puts() to print the complete
212 * environment upon "printenv". So we can't put this watchdog call
219 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
220 char NS16550_getc(NS16550_t com_port)
222 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
223 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
224 extern void usbtty_poll(void);
229 return serial_in(&com_port->rbr);
232 int NS16550_tstc(NS16550_t com_port)
234 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
237 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
239 #ifdef CONFIG_DEBUG_UART_NS16550
241 #include <debug_uart.h>
243 void debug_uart_init(void)
245 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
249 * We copy the code from above because it is already horribly messy.
250 * Trying to refactor to nicely remove the duplication doesn't seem
251 * feasible. The better fix is to move all users of this driver to
254 baud_divisor = calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
257 serial_out_shift(&com_port->ier, 0, CONFIG_SYS_NS16550_IER);
258 serial_out_shift(&com_port->mcr, 0, UART_MCRVAL);
259 serial_out_shift(&com_port->fcr, 0, UART_FCRVAL);
261 serial_out_shift(&com_port->lcr, 0, UART_LCR_BKSE | UART_LCRVAL);
262 serial_out_shift(&com_port->dll, 0, baud_divisor & 0xff);
263 serial_out_shift(&com_port->dlm, 0, (baud_divisor >> 8) & 0xff);
264 serial_out_shift(&com_port->lcr, 0, UART_LCRVAL);
267 static inline void _debug_uart_putc(int ch)
269 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
271 while (!(serial_in_shift(&com_port->lsr, 0) & UART_LSR_THRE))
273 serial_out_shift(&com_port->thr, 0, ch);
280 #ifdef CONFIG_DM_SERIAL
281 static int ns16550_serial_putc(struct udevice *dev, const char ch)
283 struct NS16550 *const com_port = dev_get_priv(dev);
285 if (!(serial_in(&com_port->lsr) & UART_LSR_THRE))
287 serial_out(ch, &com_port->thr);
290 * Call watchdog_reset() upon newline. This is done here in putc
291 * since the environment code uses a single puts() to print the complete
292 * environment upon "printenv". So we can't put this watchdog call
301 static int ns16550_serial_pending(struct udevice *dev, bool input)
303 struct NS16550 *const com_port = dev_get_priv(dev);
306 return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0;
308 return serial_in(&com_port->lsr) & UART_LSR_THRE ? 0 : 1;
311 static int ns16550_serial_getc(struct udevice *dev)
313 struct NS16550 *const com_port = dev_get_priv(dev);
315 if (!(serial_in(&com_port->lsr) & UART_LSR_DR))
318 return serial_in(&com_port->rbr);
321 static int ns16550_serial_setbrg(struct udevice *dev, int baudrate)
323 struct NS16550 *const com_port = dev_get_priv(dev);
324 struct ns16550_platdata *plat = com_port->plat;
327 clock_divisor = ns16550_calc_divisor(com_port, plat->clock, baudrate);
329 NS16550_setbrg(com_port, clock_divisor);
334 int ns16550_serial_probe(struct udevice *dev)
336 struct NS16550 *const com_port = dev_get_priv(dev);
338 com_port->plat = dev_get_platdata(dev);
339 NS16550_init(com_port, -1);
344 #ifdef CONFIG_OF_CONTROL
345 int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
347 struct ns16550_platdata *plat = dev->platdata;
350 /* try Processor Local Bus device first */
351 addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
353 if (addr == FDT_ADDR_T_NONE) {
354 /* then try pci device */
355 struct fdt_pci_addr pci_addr;
359 /* we prefer to use a memory-mapped register */
360 ret = fdtdec_get_pci_addr(gd->fdt_blob, dev->of_offset,
361 FDT_PCI_SPACE_MEM32, "reg",
364 /* try if there is any i/o-mapped register */
365 ret = fdtdec_get_pci_addr(gd->fdt_blob,
373 ret = fdtdec_get_pci_bar32(gd->fdt_blob, dev->of_offset,
382 if (addr == FDT_ADDR_T_NONE)
386 plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
393 const struct dm_serial_ops ns16550_serial_ops = {
394 .putc = ns16550_serial_putc,
395 .pending = ns16550_serial_pending,
396 .getc = ns16550_serial_getc,
397 .setbrg = ns16550_serial_setbrg,
399 #endif /* CONFIG_DM_SERIAL */