3 * originally from linux source (arch/powerpc/boot/ns16550.c)
4 * modified to use CONFIG_SYS_ISA_MEM and new defines
15 #include <linux/types.h>
18 DECLARE_GLOBAL_DATA_PTR;
20 #define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */
21 #define UART_MCRVAL (UART_MCR_DTR | \
22 UART_MCR_RTS) /* RTS/DTR */
23 #define UART_FCRVAL (UART_FCR_FIFO_EN | \
25 UART_FCR_TXSR) /* Clear & enable FIFOs */
27 #ifndef CONFIG_DM_SERIAL
28 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
29 #define serial_out(x, y) outb(x, (ulong)y)
30 #define serial_in(y) inb((ulong)y)
31 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0)
32 #define serial_out(x, y) out_be32(y, x)
33 #define serial_in(y) in_be32(y)
34 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0)
35 #define serial_out(x, y) out_le32(y, x)
36 #define serial_in(y) in_le32(y)
38 #define serial_out(x, y) writeb(x, y)
39 #define serial_in(y) readb(y)
41 #endif /* !CONFIG_DM_SERIAL */
43 #if defined(CONFIG_SOC_KEYSTONE)
44 #define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0
45 #define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) | (1 << 13) | (1 << 0))
47 #ifdef CONFIG_SERIAL_HW_FLOW_CONTROL
48 #define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE)
50 #define UART_MCRVAL (UART_MCR_RTS)
54 #ifndef CONFIG_SYS_NS16550_IER
55 #define CONFIG_SYS_NS16550_IER 0x00
56 #endif /* CONFIG_SYS_NS16550_IER */
58 #ifdef CONFIG_DM_SERIAL
60 static inline void serial_out_shift(void *addr, int shift, int value)
62 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
63 outb(value, (ulong)addr);
64 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
65 out_le32(addr, value);
66 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
67 out_be32(addr, value);
68 #elif defined(CONFIG_SYS_BIG_ENDIAN)
69 writeb(value, addr + (1 << shift) - 1);
75 static inline int serial_in_shift(void *addr, int shift)
77 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
78 return inb((ulong)addr);
79 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
81 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
83 #elif defined(CONFIG_SYS_BIG_ENDIAN)
84 return readb(addr + (1 << shift) - 1);
90 static void ns16550_writeb(NS16550_t port, int offset, int value)
92 struct ns16550_platdata *plat = port->plat;
95 offset *= 1 << plat->reg_shift;
96 addr = map_sysmem(plat->base, 0) + offset;
98 * As far as we know it doesn't make sense to support selection of
99 * these options at run-time, so use the existing CONFIG options.
101 serial_out_shift(addr, plat->reg_shift, value);
104 static int ns16550_readb(NS16550_t port, int offset)
106 struct ns16550_platdata *plat = port->plat;
109 offset *= 1 << plat->reg_shift;
110 addr = map_sysmem(plat->base, 0) + offset;
112 return serial_in_shift(addr, plat->reg_shift);
115 /* We can clean these up once everything is moved to driver model */
116 #define serial_out(value, addr) \
117 ns16550_writeb(com_port, \
118 (unsigned char *)addr - (unsigned char *)com_port, value)
119 #define serial_in(addr) \
120 ns16550_readb(com_port, \
121 (unsigned char *)addr - (unsigned char *)com_port)
124 static inline int calc_divisor(NS16550_t port, int clock, int baudrate)
126 const unsigned int mode_x_div = 16;
128 return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate);
131 int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
133 #ifdef CONFIG_OMAP1510
134 /* If can't cleanly clock 115200 set div to 1 */
135 if ((clock == 12000000) && (baudrate == 115200)) {
136 port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */
137 return 1; /* return 1 for base divisor */
139 port->osc_12m_sel = 0; /* clear if previsouly set */
142 return calc_divisor(port, clock, baudrate);
145 static void NS16550_setbrg(NS16550_t com_port, int baud_divisor)
147 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
148 serial_out(baud_divisor & 0xff, &com_port->dll);
149 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
150 serial_out(UART_LCRVAL, &com_port->lcr);
153 void NS16550_init(NS16550_t com_port, int baud_divisor)
155 #if (defined(CONFIG_SPL_BUILD) && \
156 (defined(CONFIG_OMAP34XX) || defined(CONFIG_OMAP44XX)))
158 * On some OMAP3/OMAP4 devices when UART3 is configured for boot mode
159 * before SPL starts only THRE bit is set. We have to empty the
160 * transmitter before initialization starts.
162 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE))
164 if (baud_divisor != -1)
165 NS16550_setbrg(com_port, baud_divisor);
166 serial_out(0, &com_port->mdr1);
170 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
173 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
174 #if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \
175 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
176 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
178 serial_out(UART_MCRVAL, &com_port->mcr);
179 serial_out(UART_FCRVAL, &com_port->fcr);
180 if (baud_divisor != -1)
181 NS16550_setbrg(com_port, baud_divisor);
182 #if defined(CONFIG_OMAP) || \
183 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \
184 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
186 /* /16 is proper to hit 115200 with 48MHz */
187 serial_out(0, &com_port->mdr1);
188 #endif /* CONFIG_OMAP */
189 #if defined(CONFIG_SOC_KEYSTONE)
190 serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC);
194 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
195 void NS16550_reinit(NS16550_t com_port, int baud_divisor)
197 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
198 NS16550_setbrg(com_port, 0);
199 serial_out(UART_MCRVAL, &com_port->mcr);
200 serial_out(UART_FCRVAL, &com_port->fcr);
201 NS16550_setbrg(com_port, baud_divisor);
203 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
205 void NS16550_putc(NS16550_t com_port, char c)
207 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
209 serial_out(c, &com_port->thr);
212 * Call watchdog_reset() upon newline. This is done here in putc
213 * since the environment code uses a single puts() to print the complete
214 * environment upon "printenv". So we can't put this watchdog call
221 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
222 char NS16550_getc(NS16550_t com_port)
224 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
225 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
226 extern void usbtty_poll(void);
231 return serial_in(&com_port->rbr);
234 int NS16550_tstc(NS16550_t com_port)
236 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
239 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
241 #ifdef CONFIG_DEBUG_UART_NS16550
243 #include <debug_uart.h>
245 void debug_uart_init(void)
247 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
251 * We copy the code from above because it is already horribly messy.
252 * Trying to refactor to nicely remove the duplication doesn't seem
253 * feasible. The better fix is to move all users of this driver to
256 baud_divisor = calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
258 serial_out_shift(&com_port->ier, CONFIG_DEBUG_UART_SHIFT,
259 CONFIG_SYS_NS16550_IER);
260 serial_out_shift(&com_port->mcr, CONFIG_DEBUG_UART_SHIFT, UART_MCRVAL);
261 serial_out_shift(&com_port->fcr, CONFIG_DEBUG_UART_SHIFT, UART_FCRVAL);
263 serial_out_shift(&com_port->lcr, CONFIG_DEBUG_UART_SHIFT,
264 UART_LCR_BKSE | UART_LCRVAL);
265 serial_out_shift(&com_port->dll, CONFIG_DEBUG_UART_SHIFT,
266 baud_divisor & 0xff);
267 serial_out_shift(&com_port->dlm, CONFIG_DEBUG_UART_SHIFT,
268 (baud_divisor >> 8) & 0xff);
269 serial_out_shift(&com_port->lcr, CONFIG_DEBUG_UART_SHIFT,
273 static inline void _debug_uart_putc(int ch)
275 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
277 while (!(serial_in_shift(&com_port->lsr, 0) & UART_LSR_THRE))
279 serial_out_shift(&com_port->thr, CONFIG_DEBUG_UART_SHIFT, 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 #ifdef CONFIG_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 = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
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(gd->fdt_blob, dev->of_offset,
388 if (addr == FDT_ADDR_T_NONE)
392 plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
399 const struct dm_serial_ops ns16550_serial_ops = {
400 .putc = ns16550_serial_putc,
401 .pending = ns16550_serial_pending,
402 .getc = ns16550_serial_getc,
403 .setbrg = ns16550_serial_setbrg,
405 #endif /* CONFIG_DM_SERIAL */