2 * SuperH SCIF device driver.
3 * Copyright (C) 2007,2008,2010 Nobuhiro Iwamatsu
4 * Copyright (C) 2002 - 2008 Paul Mundt
6 * SPDX-License-Identifier: GPL-2.0+
11 #include <asm/processor.h>
12 #include "serial_sh.h"
14 #include <linux/compiler.h>
16 #if defined(CONFIG_CONS_SCIF0)
17 # define SCIF_BASE SCIF0_BASE
18 #elif defined(CONFIG_CONS_SCIF1)
19 # define SCIF_BASE SCIF1_BASE
20 #elif defined(CONFIG_CONS_SCIF2)
21 # define SCIF_BASE SCIF2_BASE
22 #elif defined(CONFIG_CONS_SCIF3)
23 # define SCIF_BASE SCIF3_BASE
24 #elif defined(CONFIG_CONS_SCIF4)
25 # define SCIF_BASE SCIF4_BASE
26 #elif defined(CONFIG_CONS_SCIF5)
27 # define SCIF_BASE SCIF5_BASE
28 #elif defined(CONFIG_CONS_SCIF6)
29 # define SCIF_BASE SCIF6_BASE
30 #elif defined(CONFIG_CONS_SCIF7)
31 # define SCIF_BASE SCIF7_BASE
33 # error "Default SCIF doesn't set....."
36 #if defined(CONFIG_SCIF_A)
37 #define SCIF_BASE_PORT PORT_SCIFA
39 #define SCIF_BASE_PORT PORT_SCIF
42 static struct uart_port sh_sci = {
43 .membase = (unsigned char*)SCIF_BASE,
45 .type = SCIF_BASE_PORT,
48 static void sh_serial_setbrg(void)
50 DECLARE_GLOBAL_DATA_PTR;
51 sci_out(&sh_sci, SCBRR, SCBRR_VALUE(gd->baudrate, CONFIG_SYS_CLK_FREQ));
54 static int sh_serial_init(void)
56 sci_out(&sh_sci, SCSCR , SCSCR_INIT(&sh_sci));
57 sci_out(&sh_sci, SCSCR , SCSCR_INIT(&sh_sci));
58 sci_out(&sh_sci, SCSMR, 0);
59 sci_out(&sh_sci, SCSMR, 0);
60 sci_out(&sh_sci, SCFCR, SCFCR_RFRST|SCFCR_TFRST);
61 sci_in(&sh_sci, SCFCR);
62 sci_out(&sh_sci, SCFCR, 0);
68 #if defined(CONFIG_CPU_SH7760) || \
69 defined(CONFIG_CPU_SH7780) || \
70 defined(CONFIG_CPU_SH7785) || \
71 defined(CONFIG_CPU_SH7786)
72 static int scif_rxfill(struct uart_port *port)
74 return sci_in(port, SCRFDR) & 0xff;
76 #elif defined(CONFIG_CPU_SH7763)
77 static int scif_rxfill(struct uart_port *port)
79 if ((port->mapbase == 0xffe00000) ||
80 (port->mapbase == 0xffe08000)) {
82 return sci_in(port, SCRFDR) & 0xff;
85 return sci_in(port, SCFDR) & SCIF2_RFDC_MASK;
88 #elif defined(CONFIG_ARCH_SH7372)
89 static int scif_rxfill(struct uart_port *port)
91 if (port->type == PORT_SCIFA)
92 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
94 return sci_in(port, SCRFDR);
97 static int scif_rxfill(struct uart_port *port)
99 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
103 static int serial_rx_fifo_level(void)
105 return scif_rxfill(&sh_sci);
108 static void handle_error(void)
110 sci_in(&sh_sci, SCxSR);
111 sci_out(&sh_sci, SCxSR, SCxSR_ERROR_CLEAR(&sh_sci));
112 sci_in(&sh_sci, SCLSR);
113 sci_out(&sh_sci, SCLSR, 0x00);
116 void serial_raw_putc(const char c)
119 /* Tx fifo is empty */
120 if (sci_in(&sh_sci, SCxSR) & SCxSR_TEND(&sh_sci))
124 sci_out(&sh_sci, SCxTDR, c);
125 sci_out(&sh_sci, SCxSR, sci_in(&sh_sci, SCxSR) & ~SCxSR_TEND(&sh_sci));
128 static void sh_serial_putc(const char c)
131 serial_raw_putc('\r');
135 static int sh_serial_tstc(void)
137 if (sci_in(&sh_sci, SCxSR) & SCIF_ERRORS) {
142 return serial_rx_fifo_level() ? 1 : 0;
146 int serial_getc_check(void)
148 unsigned short status;
150 status = sci_in(&sh_sci, SCxSR);
152 if (status & SCIF_ERRORS)
154 if (sci_in(&sh_sci, SCLSR) & SCxSR_ORER(&sh_sci))
156 return status & (SCIF_DR | SCxSR_RDxF(&sh_sci));
159 static int sh_serial_getc(void)
161 unsigned short status;
164 while (!serial_getc_check())
167 ch = sci_in(&sh_sci, SCxRDR);
168 status = sci_in(&sh_sci, SCxSR);
170 sci_out(&sh_sci, SCxSR, SCxSR_RDxF_CLEAR(&sh_sci));
172 if (status & SCIF_ERRORS)
175 if (sci_in(&sh_sci, SCLSR) & SCxSR_ORER(&sh_sci))
180 static struct serial_device sh_serial_drv = {
182 .start = sh_serial_init,
184 .setbrg = sh_serial_setbrg,
185 .putc = sh_serial_putc,
186 .puts = default_serial_puts,
187 .getc = sh_serial_getc,
188 .tstc = sh_serial_tstc,
191 void sh_serial_initialize(void)
193 serial_register(&sh_serial_drv);
196 __weak struct serial_device *default_serial_console(void)
198 return &sh_serial_drv;