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9#include <common.h>
10#include <errno.h>
11#include <clk.h>
12#include <dm.h>
13#include <asm/io.h>
14#include <asm/processor.h>
15#include <serial.h>
16#include <linux/compiler.h>
17#include <dm/platform_data/serial_sh.h>
18#include "serial_sh.h"
19
20DECLARE_GLOBAL_DATA_PTR;
21
22#if defined(CONFIG_CPU_SH7760) || \
23 defined(CONFIG_CPU_SH7780) || \
24 defined(CONFIG_CPU_SH7785) || \
25 defined(CONFIG_CPU_SH7786)
26static int scif_rxfill(struct uart_port *port)
27{
28 return sci_in(port, SCRFDR) & 0xff;
29}
30#elif defined(CONFIG_CPU_SH7763)
31static int scif_rxfill(struct uart_port *port)
32{
33 if ((port->mapbase == 0xffe00000) ||
34 (port->mapbase == 0xffe08000)) {
35
36 return sci_in(port, SCRFDR) & 0xff;
37 } else {
38
39 return sci_in(port, SCFDR) & SCIF2_RFDC_MASK;
40 }
41}
42#elif defined(CONFIG_ARCH_SH7372)
43static int scif_rxfill(struct uart_port *port)
44{
45 if (port->type == PORT_SCIFA)
46 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
47 else
48 return sci_in(port, SCRFDR);
49}
50#else
51static int scif_rxfill(struct uart_port *port)
52{
53 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
54}
55#endif
56
57static void sh_serial_init_generic(struct uart_port *port)
58{
59 sci_out(port, SCSCR , SCSCR_INIT(port));
60 sci_out(port, SCSCR , SCSCR_INIT(port));
61 sci_out(port, SCSMR, 0);
62 sci_out(port, SCSMR, 0);
63 sci_out(port, SCFCR, SCFCR_RFRST|SCFCR_TFRST);
64 sci_in(port, SCFCR);
65 sci_out(port, SCFCR, 0);
66}
67
68static void
69sh_serial_setbrg_generic(struct uart_port *port, int clk, int baudrate)
70{
71 if (port->clk_mode == EXT_CLK) {
72 unsigned short dl = DL_VALUE(baudrate, clk);
73 sci_out(port, DL, dl);
74
75 udelay((1000000 * dl * 16 / clk) * 1000 + 1);
76 } else {
77 sci_out(port, SCBRR, SCBRR_VALUE(baudrate, clk));
78 }
79}
80
81static void handle_error(struct uart_port *port)
82{
83 sci_in(port, SCxSR);
84 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
85 sci_in(port, SCLSR);
86 sci_out(port, SCLSR, 0x00);
87}
88
89static int serial_raw_putc(struct uart_port *port, const char c)
90{
91
92 if (!(sci_in(port, SCxSR) & SCxSR_TEND(port)))
93 return -EAGAIN;
94
95 sci_out(port, SCxTDR, c);
96 sci_out(port, SCxSR, sci_in(port, SCxSR) & ~SCxSR_TEND(port));
97
98 return 0;
99}
100
101static int serial_rx_fifo_level(struct uart_port *port)
102{
103 return scif_rxfill(port);
104}
105
106static int sh_serial_tstc_generic(struct uart_port *port)
107{
108 if (sci_in(port, SCxSR) & SCIF_ERRORS) {
109 handle_error(port);
110 return 0;
111 }
112
113 return serial_rx_fifo_level(port) ? 1 : 0;
114}
115
116static int serial_getc_check(struct uart_port *port)
117{
118 unsigned short status;
119
120 status = sci_in(port, SCxSR);
121
122 if (status & SCIF_ERRORS)
123 handle_error(port);
124 if (sci_in(port, SCLSR) & SCxSR_ORER(port))
125 handle_error(port);
126 return status & (SCIF_DR | SCxSR_RDxF(port));
127}
128
129static int sh_serial_getc_generic(struct uart_port *port)
130{
131 unsigned short status;
132 char ch;
133
134 if (!serial_getc_check(port))
135 return -EAGAIN;
136
137 ch = sci_in(port, SCxRDR);
138 status = sci_in(port, SCxSR);
139
140 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
141
142 if (status & SCIF_ERRORS)
143 handle_error(port);
144
145 if (sci_in(port, SCLSR) & SCxSR_ORER(port))
146 handle_error(port);
147
148 return ch;
149}
150
151#if CONFIG_IS_ENABLED(DM_SERIAL)
152
153static int sh_serial_pending(struct udevice *dev, bool input)
154{
155 struct uart_port *priv = dev_get_priv(dev);
156
157 return sh_serial_tstc_generic(priv);
158}
159
160static int sh_serial_putc(struct udevice *dev, const char ch)
161{
162 struct uart_port *priv = dev_get_priv(dev);
163
164 return serial_raw_putc(priv, ch);
165}
166
167static int sh_serial_getc(struct udevice *dev)
168{
169 struct uart_port *priv = dev_get_priv(dev);
170
171 return sh_serial_getc_generic(priv);
172}
173
174static int sh_serial_setbrg(struct udevice *dev, int baudrate)
175{
176 struct sh_serial_platdata *plat = dev_get_platdata(dev);
177 struct uart_port *priv = dev_get_priv(dev);
178
179 sh_serial_setbrg_generic(priv, plat->clk, baudrate);
180
181 return 0;
182}
183
184static int sh_serial_probe(struct udevice *dev)
185{
186 struct sh_serial_platdata *plat = dev_get_platdata(dev);
187 struct uart_port *priv = dev_get_priv(dev);
188
189 priv->membase = (unsigned char *)plat->base;
190 priv->mapbase = plat->base;
191 priv->type = plat->type;
192 priv->clk_mode = plat->clk_mode;
193
194 sh_serial_init_generic(priv);
195
196 return 0;
197}
198
199static const struct dm_serial_ops sh_serial_ops = {
200 .putc = sh_serial_putc,
201 .pending = sh_serial_pending,
202 .getc = sh_serial_getc,
203 .setbrg = sh_serial_setbrg,
204};
205
206#if CONFIG_IS_ENABLED(OF_CONTROL)
207static const struct udevice_id sh_serial_id[] ={
208 {.compatible = "renesas,sci", .data = PORT_SCI},
209 {.compatible = "renesas,scif", .data = PORT_SCIF},
210 {.compatible = "renesas,scifa", .data = PORT_SCIFA},
211 {}
212};
213
214static int sh_serial_ofdata_to_platdata(struct udevice *dev)
215{
216 struct sh_serial_platdata *plat = dev_get_platdata(dev);
217 struct clk sh_serial_clk;
218 fdt_addr_t addr;
219 int ret;
220
221 addr = devfdt_get_addr(dev);
222 if (!addr)
223 return -EINVAL;
224
225 plat->base = addr;
226
227 ret = clk_get_by_name(dev, "fck", &sh_serial_clk);
228 if (!ret) {
229 ret = clk_enable(&sh_serial_clk);
230 if (!ret)
231 plat->clk = clk_get_rate(&sh_serial_clk);
232 } else {
233 plat->clk = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
234 "clock", 1);
235 }
236
237 plat->type = dev_get_driver_data(dev);
238 return 0;
239}
240#endif
241
242U_BOOT_DRIVER(serial_sh) = {
243 .name = "serial_sh",
244 .id = UCLASS_SERIAL,
245 .of_match = of_match_ptr(sh_serial_id),
246 .ofdata_to_platdata = of_match_ptr(sh_serial_ofdata_to_platdata),
247 .platdata_auto_alloc_size = sizeof(struct sh_serial_platdata),
248 .probe = sh_serial_probe,
249 .ops = &sh_serial_ops,
250#if !CONFIG_IS_ENABLED(OF_CONTROL)
251 .flags = DM_FLAG_PRE_RELOC,
252#endif
253 .priv_auto_alloc_size = sizeof(struct uart_port),
254};
255
256#else
257
258#if defined(CONFIG_CONS_SCIF0)
259# define SCIF_BASE SCIF0_BASE
260#elif defined(CONFIG_CONS_SCIF1)
261# define SCIF_BASE SCIF1_BASE
262#elif defined(CONFIG_CONS_SCIF2)
263# define SCIF_BASE SCIF2_BASE
264#elif defined(CONFIG_CONS_SCIF3)
265# define SCIF_BASE SCIF3_BASE
266#elif defined(CONFIG_CONS_SCIF4)
267# define SCIF_BASE SCIF4_BASE
268#elif defined(CONFIG_CONS_SCIF5)
269# define SCIF_BASE SCIF5_BASE
270#elif defined(CONFIG_CONS_SCIF6)
271# define SCIF_BASE SCIF6_BASE
272#elif defined(CONFIG_CONS_SCIF7)
273# define SCIF_BASE SCIF7_BASE
274#elif defined(CONFIG_CONS_SCIFA0)
275# define SCIF_BASE SCIFA0_BASE
276#else
277# error "Default SCIF doesn't set....."
278#endif
279
280#if defined(CONFIG_SCIF_A)
281 #define SCIF_BASE_PORT PORT_SCIFA
282#elif defined(CONFIG_SCI)
283 #define SCIF_BASE_PORT PORT_SCI
284#else
285 #define SCIF_BASE_PORT PORT_SCIF
286#endif
287
288static struct uart_port sh_sci = {
289 .membase = (unsigned char *)SCIF_BASE,
290 .mapbase = SCIF_BASE,
291 .type = SCIF_BASE_PORT,
292#ifdef CONFIG_SCIF_USE_EXT_CLK
293 .clk_mode = EXT_CLK,
294#endif
295};
296
297static void sh_serial_setbrg(void)
298{
299 DECLARE_GLOBAL_DATA_PTR;
300 struct uart_port *port = &sh_sci;
301
302 sh_serial_setbrg_generic(port, CONFIG_SH_SCIF_CLK_FREQ, gd->baudrate);
303}
304
305static int sh_serial_init(void)
306{
307 struct uart_port *port = &sh_sci;
308
309 sh_serial_init_generic(port);
310 serial_setbrg();
311
312 return 0;
313}
314
315static void sh_serial_putc(const char c)
316{
317 struct uart_port *port = &sh_sci;
318
319 if (c == '\n') {
320 while (1) {
321 if (serial_raw_putc(port, '\r') != -EAGAIN)
322 break;
323 }
324 }
325 while (1) {
326 if (serial_raw_putc(port, c) != -EAGAIN)
327 break;
328 }
329}
330
331static int sh_serial_tstc(void)
332{
333 struct uart_port *port = &sh_sci;
334
335 return sh_serial_tstc_generic(port);
336}
337
338static int sh_serial_getc(void)
339{
340 struct uart_port *port = &sh_sci;
341 int ch;
342
343 while (1) {
344 ch = sh_serial_getc_generic(port);
345 if (ch != -EAGAIN)
346 break;
347 }
348
349 return ch;
350}
351
352static struct serial_device sh_serial_drv = {
353 .name = "sh_serial",
354 .start = sh_serial_init,
355 .stop = NULL,
356 .setbrg = sh_serial_setbrg,
357 .putc = sh_serial_putc,
358 .puts = default_serial_puts,
359 .getc = sh_serial_getc,
360 .tstc = sh_serial_tstc,
361};
362
363void sh_serial_initialize(void)
364{
365 serial_register(&sh_serial_drv);
366}
367
368__weak struct serial_device *default_serial_console(void)
369{
370 return &sh_serial_drv;
371}
372#endif
373
