1/*- 2 * Copyright (c) 2009-2010 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Semihalf under sponsorship from 6 * the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#include <sys/cdefs.h>
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32 33#include <sys/param.h> 34#include <sys/bus.h> 35#include <sys/kernel.h> 36#include <sys/module.h> 37 38#include <machine/bus.h> 39#include <machine/fdt.h>
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119 if ((err = uart_fdt_get_clock(node, &clock)) != 0) 120 return (err); 121 uart_fdt_get_shift(node, &shift); 122 123 return (uart_bus_probe(dev, (int)shift, (int)clock, 0, 0)); 124} 125 126DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0);
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127
128/*
129 * UART console routines.
130 */
131bus_space_tag_t uart_bus_space_io;
132bus_space_tag_t uart_bus_space_mem;
133
134int
135uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
136{
137
138 return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
139}
140
141int
142uart_cpu_getdev(int devtype, struct uart_devinfo *di)
143{
144 char buf[64];
145 struct uart_class *class;
146 phandle_t node, chosen;
147 pcell_t shift, br, rclk;
148 u_long start, size, pbase, psize;
149 int err;
150
151 uart_bus_space_mem = fdtbus_bs_tag;
152 uart_bus_space_io = NULL;
153
154 /* Allow overriding the FDT uning the environment. */
155 class = &uart_ns8250_class;
156 err = uart_getenv(devtype, di, class);
157 if (!err)
158 return (0);
159
160 if (devtype != UART_DEV_CONSOLE)
161 return (ENXIO);
162
163 /*
164 * Retrieve /chosen/std{in,out}.
165 */
166 if ((chosen = OF_finddevice("/chosen")) == -1)
167 return (ENXIO);
168 if (OF_getprop(chosen, "stdin", buf, sizeof(buf)) <= 0)
169 return (ENXIO);
170 if ((node = OF_finddevice(buf)) == -1)
171 return (ENXIO);
172 if (OF_getprop(chosen, "stdout", buf, sizeof(buf)) <= 0)
173 return (ENXIO);
174 if (OF_finddevice(buf) != node)
175 /* Only stdin == stdout is supported. */
176 return (ENXIO);
177 /*
178 * Retrieve serial attributes.
179 */
180 uart_fdt_get_shift(node, &shift);
181
182 if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0)
183 br = 0;
184 br = fdt32_to_cpu(br);
185
186 if ((err = uart_fdt_get_clock(node, &rclk)) != 0)
187 return (err);
188 /*
189 * Finalize configuration.
190 */
191 if (fdt_is_compatible(node, "fsl,imx-uart"))
192 class = &uart_imx_class;
193 if (fdt_is_compatible(node, "quicc"))
194 class = &uart_quicc_class;
195 if (fdt_is_compatible(node, "lpc"))
196 class = &uart_lpc_class;
197 if (fdt_is_compatible(node, "ns16550"))
198 class = &uart_ns8250_class;
199 if (fdt_is_compatible(node, "arm,pl011"))
200 class = &uart_pl011_class;
201 if (fdt_is_compatible(node, "cadence,uart"))
202 class = &uart_cdnc_class;
203
204 di->bas.chan = 0;
205 di->bas.regshft = (u_int)shift;
206 di->baudrate = br;
207 di->bas.rclk = (u_int)rclk;
208 di->ops = uart_getops(class);
209 di->databits = 8;
210 di->stopbits = 1;
211 di->parity = UART_PARITY_NONE;
212 di->bas.bst = uart_bus_space_mem;
213
214 err = fdt_regsize(node, &start, &size);
215 if (err)
216 return (ENXIO);
217 err = fdt_get_range(OF_parent(node), 0, &pbase, &psize);
218 if (err)
219 pbase = 0;
220
221 start += pbase;
222
223 return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh));
224}
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