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;
52 sci_out(&sh_sci, SCBRR,
53 SCBRR_VALUE(gd->baudrate, CONFIG_SH_SCIF_CLK_FREQ));
56 static int sh_serial_init(void)
58 sci_out(&sh_sci, SCSCR , SCSCR_INIT(&sh_sci));
59 sci_out(&sh_sci, SCSCR , SCSCR_INIT(&sh_sci));
60 sci_out(&sh_sci, SCSMR, 0);
61 sci_out(&sh_sci, SCSMR, 0);
62 sci_out(&sh_sci, SCFCR, SCFCR_RFRST|SCFCR_TFRST);
63 sci_in(&sh_sci, SCFCR);
64 sci_out(&sh_sci, SCFCR, 0);
70 #if defined(CONFIG_CPU_SH7760) || \
71 defined(CONFIG_CPU_SH7780) || \
72 defined(CONFIG_CPU_SH7785) || \
73 defined(CONFIG_CPU_SH7786)
74 static int scif_rxfill(struct uart_port *port)
76 return sci_in(port, SCRFDR) & 0xff;
78 #elif defined(CONFIG_CPU_SH7763)
79 static int scif_rxfill(struct uart_port *port)
81 if ((port->mapbase == 0xffe00000) ||
82 (port->mapbase == 0xffe08000)) {
84 return sci_in(port, SCRFDR) & 0xff;
87 return sci_in(port, SCFDR) & SCIF2_RFDC_MASK;
90 #elif defined(CONFIG_ARCH_SH7372)
91 static int scif_rxfill(struct uart_port *port)
93 if (port->type == PORT_SCIFA)
94 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
96 return sci_in(port, SCRFDR);
99 static int scif_rxfill(struct uart_port *port)
101 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
105 static int serial_rx_fifo_level(void)
107 return scif_rxfill(&sh_sci);
110 static void handle_error(void)
112 sci_in(&sh_sci, SCxSR);
113 sci_out(&sh_sci, SCxSR, SCxSR_ERROR_CLEAR(&sh_sci));
114 sci_in(&sh_sci, SCLSR);
115 sci_out(&sh_sci, SCLSR, 0x00);
118 void serial_raw_putc(const char c)
121 /* Tx fifo is empty */
122 if (sci_in(&sh_sci, SCxSR) & SCxSR_TEND(&sh_sci))
126 sci_out(&sh_sci, SCxTDR, c);
127 sci_out(&sh_sci, SCxSR, sci_in(&sh_sci, SCxSR) & ~SCxSR_TEND(&sh_sci));
130 static void sh_serial_putc(const char c)
133 serial_raw_putc('\r');
137 static int sh_serial_tstc(void)
139 if (sci_in(&sh_sci, SCxSR) & SCIF_ERRORS) {
144 return serial_rx_fifo_level() ? 1 : 0;
148 int serial_getc_check(void)
150 unsigned short status;
152 status = sci_in(&sh_sci, SCxSR);
154 if (status & SCIF_ERRORS)
156 if (sci_in(&sh_sci, SCLSR) & SCxSR_ORER(&sh_sci))
158 return status & (SCIF_DR | SCxSR_RDxF(&sh_sci));
161 static int sh_serial_getc(void)
163 unsigned short status;
166 while (!serial_getc_check())
169 ch = sci_in(&sh_sci, SCxRDR);
170 status = sci_in(&sh_sci, SCxSR);
172 sci_out(&sh_sci, SCxSR, SCxSR_RDxF_CLEAR(&sh_sci));
174 if (status & SCIF_ERRORS)
177 if (sci_in(&sh_sci, SCLSR) & SCxSR_ORER(&sh_sci))
182 static struct serial_device sh_serial_drv = {
184 .start = sh_serial_init,
186 .setbrg = sh_serial_setbrg,
187 .putc = sh_serial_putc,
188 .puts = default_serial_puts,
189 .getc = sh_serial_getc,
190 .tstc = sh_serial_tstc,
193 void sh_serial_initialize(void)
195 serial_register(&sh_serial_drv);
198 __weak struct serial_device *default_serial_console(void)
200 return &sh_serial_drv;