2 * Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
35 #include <sys/endian.h>
36 #include <sys/kernel.h>
37 #include <sys/kthread.h>
39 #include <sys/malloc.h>
40 #include <sys/module.h>
41 #include <sys/mutex.h>
42 #include <sys/queue.h>
43 #include <sys/resource.h>
46 #include <sys/timetc.h>
47 #include <sys/watchdog.h>
49 #include <machine/bus.h>
50 #include <machine/resource.h>
51 #include <machine/intr.h>
53 #include <dev/spibus/spi.h>
54 #include <dev/spibus/spibusvar.h>
56 #include <dev/ofw/ofw_bus.h>
57 #include <dev/ofw/ofw_bus_subr.h>
59 #include <arm/lpc/lpcreg.h>
60 #include <arm/lpc/lpcvar.h>
62 #include "spibus_if.h"
67 struct resource * ls_mem_res;
68 struct resource * ls_irq_res;
69 bus_space_tag_t ls_bst;
70 bus_space_handle_t ls_bsh;
73 static int lpc_spi_probe(device_t);
74 static int lpc_spi_attach(device_t);
75 static int lpc_spi_detach(device_t);
76 static int lpc_spi_transfer(device_t, device_t, struct spi_command *);
78 #define lpc_spi_read_4(_sc, _reg) \
79 bus_space_read_4(_sc->ls_bst, _sc->ls_bsh, _reg)
80 #define lpc_spi_write_4(_sc, _reg, _val) \
81 bus_space_write_4(_sc->ls_bst, _sc->ls_bsh, _reg, _val)
84 lpc_spi_probe(device_t dev)
87 if (!ofw_bus_status_okay(dev))
90 if (!ofw_bus_is_compatible(dev, "lpc,spi"))
93 device_set_desc(dev, "LPC32x0 PL022 SPI/SSP controller");
94 return (BUS_PROBE_DEFAULT);
98 lpc_spi_attach(device_t dev)
100 struct lpc_spi_softc *sc = device_get_softc(dev);
106 sc->ls_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
108 if (!sc->ls_mem_res) {
109 device_printf(dev, "cannot allocate memory window\n");
113 sc->ls_bst = rman_get_bustag(sc->ls_mem_res);
114 sc->ls_bsh = rman_get_bushandle(sc->ls_mem_res);
117 sc->ls_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
119 if (!sc->ls_irq_res) {
120 device_printf(dev, "cannot allocate interrupt\n");
124 bus_space_write_4(sc->ls_bst, 0xd0028100, 0, (1<<12)|(1<<10)|(1<<9)|(1<<8)|(1<<6)|(1<<5));
125 lpc_pwr_write(dev, LPC_CLKPWR_SSP_CTRL, LPC_CLKPWR_SSP_CTRL_SSP0EN);
126 lpc_spi_write_4(sc, LPC_SSP_CR0, LPC_SSP_CR0_DSS(8));
127 lpc_spi_write_4(sc, LPC_SSP_CR1, LPC_SSP_CR1_SSE);
128 lpc_spi_write_4(sc, LPC_SSP_CPSR, 128);
130 device_add_child(dev, "spibus", 0);
131 return (bus_generic_attach(dev));
135 lpc_spi_detach(device_t dev)
141 lpc_spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
143 struct lpc_spi_softc *sc = device_get_softc(dev);
145 uint8_t *in_buf, *out_buf;
148 spibus_get_cs(child, &cs);
150 cs &= ~SPIBUS_CS_HIGH;
153 lpc_gpio_set_state(child, cs, 0);
155 /* Wait for FIFO to be ready */
156 while ((lpc_spi_read_4(sc, LPC_SSP_SR) & LPC_SSP_SR_TNF) == 0);
159 in_buf = cmd->rx_cmd;
160 out_buf = cmd->tx_cmd;
161 for (i = 0; i < cmd->tx_cmd_sz; i++) {
162 lpc_spi_write_4(sc, LPC_SSP_DR, out_buf[i]);
163 in_buf[i] = lpc_spi_read_4(sc, LPC_SSP_DR);
167 in_buf = cmd->rx_data;
168 out_buf = cmd->tx_data;
169 for (i = 0; i < cmd->tx_data_sz; i++) {
170 lpc_spi_write_4(sc, LPC_SSP_DR, out_buf[i]);
171 in_buf[i] = lpc_spi_read_4(sc, LPC_SSP_DR);
174 /* Set CS inactive */
175 lpc_gpio_set_state(child, cs, 1);
180 static device_method_t lpc_spi_methods[] = {
181 /* Device interface */
182 DEVMETHOD(device_probe, lpc_spi_probe),
183 DEVMETHOD(device_attach, lpc_spi_attach),
184 DEVMETHOD(device_detach, lpc_spi_detach),
187 DEVMETHOD(spibus_transfer, lpc_spi_transfer),
192 static devclass_t lpc_spi_devclass;
194 static driver_t lpc_spi_driver = {
197 sizeof(struct lpc_spi_softc),
200 DRIVER_MODULE(lpcspi, simplebus, lpc_spi_driver, lpc_spi_devclass, 0, 0);