2 * SuperH SCIF device driver.
3 * Copyright (C) 2013 Renesas Electronics Corporation
4 * Copyright (C) 2007,2008,2010 Nobuhiro Iwamatsu
5 * Copyright (C) 2002 - 2008 Paul Mundt
7 * SPDX-License-Identifier: GPL-2.0+
12 #include <asm/processor.h>
13 #include "serial_sh.h"
15 #include <linux/compiler.h>
17 #if defined(CONFIG_CONS_SCIF0)
18 # define SCIF_BASE SCIF0_BASE
19 #elif defined(CONFIG_CONS_SCIF1)
20 # define SCIF_BASE SCIF1_BASE
21 #elif defined(CONFIG_CONS_SCIF2)
22 # define SCIF_BASE SCIF2_BASE
23 #elif defined(CONFIG_CONS_SCIF3)
24 # define SCIF_BASE SCIF3_BASE
25 #elif defined(CONFIG_CONS_SCIF4)
26 # define SCIF_BASE SCIF4_BASE
27 #elif defined(CONFIG_CONS_SCIF5)
28 # define SCIF_BASE SCIF5_BASE
29 #elif defined(CONFIG_CONS_SCIF6)
30 # define SCIF_BASE SCIF6_BASE
31 #elif defined(CONFIG_CONS_SCIF7)
32 # define SCIF_BASE SCIF7_BASE
34 # error "Default SCIF doesn't set....."
37 #if defined(CONFIG_SCIF_A)
38 #define SCIF_BASE_PORT PORT_SCIFA
40 #define SCIF_BASE_PORT PORT_SCIF
43 static struct uart_port sh_sci = {
44 .membase = (unsigned char*)SCIF_BASE,
46 .type = SCIF_BASE_PORT,
49 static void sh_serial_setbrg(void)
51 DECLARE_GLOBAL_DATA_PTR;
53 sci_out(&sh_sci, SCBRR,
54 SCBRR_VALUE(gd->baudrate, CONFIG_SH_SCIF_CLK_FREQ));
57 static int sh_serial_init(void)
59 sci_out(&sh_sci, SCSCR , SCSCR_INIT(&sh_sci));
60 sci_out(&sh_sci, SCSCR , SCSCR_INIT(&sh_sci));
61 sci_out(&sh_sci, SCSMR, 0);
62 sci_out(&sh_sci, SCSMR, 0);
63 sci_out(&sh_sci, SCFCR, SCFCR_RFRST|SCFCR_TFRST);
64 sci_in(&sh_sci, SCFCR);
65 sci_out(&sh_sci, SCFCR, 0);
71 #if defined(CONFIG_CPU_SH7760) || \
72 defined(CONFIG_CPU_SH7780) || \
73 defined(CONFIG_CPU_SH7785) || \
74 defined(CONFIG_CPU_SH7786)
75 static int scif_rxfill(struct uart_port *port)
77 return sci_in(port, SCRFDR) & 0xff;
79 #elif defined(CONFIG_CPU_SH7763)
80 static int scif_rxfill(struct uart_port *port)
82 if ((port->mapbase == 0xffe00000) ||
83 (port->mapbase == 0xffe08000)) {
85 return sci_in(port, SCRFDR) & 0xff;
88 return sci_in(port, SCFDR) & SCIF2_RFDC_MASK;
91 #elif defined(CONFIG_ARCH_SH7372)
92 static int scif_rxfill(struct uart_port *port)
94 if (port->type == PORT_SCIFA)
95 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
97 return sci_in(port, SCRFDR);
100 static int scif_rxfill(struct uart_port *port)
102 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
106 static int serial_rx_fifo_level(void)
108 return scif_rxfill(&sh_sci);
111 static void handle_error(void)
113 sci_in(&sh_sci, SCxSR);
114 sci_out(&sh_sci, SCxSR, SCxSR_ERROR_CLEAR(&sh_sci));
115 sci_in(&sh_sci, SCLSR);
116 sci_out(&sh_sci, SCLSR, 0x00);
119 void serial_raw_putc(const char c)
122 /* Tx fifo is empty */
123 if (sci_in(&sh_sci, SCxSR) & SCxSR_TEND(&sh_sci))
127 sci_out(&sh_sci, SCxTDR, c);
128 sci_out(&sh_sci, SCxSR, sci_in(&sh_sci, SCxSR) & ~SCxSR_TEND(&sh_sci));
131 static void sh_serial_putc(const char c)
134 serial_raw_putc('\r');
138 static int sh_serial_tstc(void)
140 if (sci_in(&sh_sci, SCxSR) & SCIF_ERRORS) {
145 return serial_rx_fifo_level() ? 1 : 0;
149 int serial_getc_check(void)
151 unsigned short status;
153 status = sci_in(&sh_sci, SCxSR);
155 if (status & SCIF_ERRORS)
157 if (sci_in(&sh_sci, SCLSR) & SCxSR_ORER(&sh_sci))
159 return status & (SCIF_DR | SCxSR_RDxF(&sh_sci));
162 static int sh_serial_getc(void)
164 unsigned short status;
167 while (!serial_getc_check())
170 ch = sci_in(&sh_sci, SCxRDR);
171 status = sci_in(&sh_sci, SCxSR);
173 sci_out(&sh_sci, SCxSR, SCxSR_RDxF_CLEAR(&sh_sci));
175 if (status & SCIF_ERRORS)
178 if (sci_in(&sh_sci, SCLSR) & SCxSR_ORER(&sh_sci))
183 static struct serial_device sh_serial_drv = {
185 .start = sh_serial_init,
187 .setbrg = sh_serial_setbrg,
188 .putc = sh_serial_putc,
189 .puts = default_serial_puts,
190 .getc = sh_serial_getc,
191 .tstc = sh_serial_tstc,
194 void sh_serial_initialize(void)
196 serial_register(&sh_serial_drv);
199 __weak struct serial_device *default_serial_console(void)
201 return &sh_serial_drv;