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/cpu.h>
51 #include <machine/cpufunc.h>
52 #include <machine/resource.h>
53 #include <machine/intr.h>
55 #include <dev/spibus/spi.h>
56 #include <dev/spibus/spibusvar.h>
58 #include <dev/ofw/ofw_bus.h>
59 #include <dev/ofw/ofw_bus_subr.h>
61 #include <arm/lpc/lpcreg.h>
62 #include <arm/lpc/lpcvar.h>
64 #include "spibus_if.h"
69 struct resource * ls_mem_res;
70 struct resource * ls_irq_res;
71 bus_space_tag_t ls_bst;
72 bus_space_handle_t ls_bsh;
75 static int lpc_spi_probe(device_t);
76 static int lpc_spi_attach(device_t);
77 static int lpc_spi_detach(device_t);
78 static int lpc_spi_transfer(device_t, device_t, struct spi_command *);
80 #define lpc_spi_read_4(_sc, _reg) \
81 bus_space_read_4(_sc->ls_bst, _sc->ls_bsh, _reg)
82 #define lpc_spi_write_4(_sc, _reg, _val) \
83 bus_space_write_4(_sc->ls_bst, _sc->ls_bsh, _reg, _val)
86 lpc_spi_probe(device_t dev)
88 if (!ofw_bus_is_compatible(dev, "lpc,spi"))
91 device_set_desc(dev, "LPC32x0 PL022 SPI/SSP controller");
92 return (BUS_PROBE_DEFAULT);
96 lpc_spi_attach(device_t dev)
98 struct lpc_spi_softc *sc = device_get_softc(dev);
104 sc->ls_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
106 if (!sc->ls_mem_res) {
107 device_printf(dev, "cannot allocate memory window\n");
111 sc->ls_bst = rman_get_bustag(sc->ls_mem_res);
112 sc->ls_bsh = rman_get_bushandle(sc->ls_mem_res);
115 sc->ls_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
117 if (!sc->ls_irq_res) {
118 device_printf(dev, "cannot allocate interrupt\n");
122 bus_space_write_4(sc->ls_bst, 0xd0028100, 0, (1<<12)|(1<<10)|(1<<9)|(1<<8)|(1<<6)|(1<<5));
123 lpc_pwr_write(dev, LPC_CLKPWR_SSP_CTRL, LPC_CLKPWR_SSP_CTRL_SSP0EN);
124 lpc_spi_write_4(sc, LPC_SSP_CR0, LPC_SSP_CR0_DSS(8));
125 lpc_spi_write_4(sc, LPC_SSP_CR1, LPC_SSP_CR1_SSE);
126 lpc_spi_write_4(sc, LPC_SSP_CPSR, 128);
128 device_add_child(dev, "spibus", 0);
129 return (bus_generic_attach(dev));
133 lpc_spi_detach(device_t dev)
139 lpc_spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
141 struct lpc_spi_softc *sc = device_get_softc(dev);
142 struct spibus_ivar *devi = SPIBUS_IVAR(child);
143 uint8_t *in_buf, *out_buf;
147 lpc_gpio_set_state(child, devi->cs, 0);
149 /* Wait for FIFO to be ready */
150 while ((lpc_spi_read_4(sc, LPC_SSP_SR) & LPC_SSP_SR_TNF) == 0);
153 in_buf = cmd->rx_cmd;
154 out_buf = cmd->tx_cmd;
155 for (i = 0; i < cmd->tx_cmd_sz; i++) {
156 lpc_spi_write_4(sc, LPC_SSP_DR, out_buf[i]);
157 in_buf[i] = lpc_spi_read_4(sc, LPC_SSP_DR);
161 in_buf = cmd->rx_data;
162 out_buf = cmd->tx_data;
163 for (i = 0; i < cmd->tx_data_sz; i++) {
164 lpc_spi_write_4(sc, LPC_SSP_DR, out_buf[i]);
165 in_buf[i] = lpc_spi_read_4(sc, LPC_SSP_DR);
168 /* Set CS inactive */
169 lpc_gpio_set_state(child, devi->cs, 1);
174 static device_method_t lpc_spi_methods[] = {
175 /* Device interface */
176 DEVMETHOD(device_probe, lpc_spi_probe),
177 DEVMETHOD(device_attach, lpc_spi_attach),
178 DEVMETHOD(device_detach, lpc_spi_detach),
181 DEVMETHOD(spibus_transfer, lpc_spi_transfer),
186 static devclass_t lpc_spi_devclass;
188 static driver_t lpc_spi_driver = {
191 sizeof(struct lpc_spi_softc),
194 DRIVER_MODULE(lpcspi, simplebus, lpc_spi_driver, lpc_spi_devclass, 0, 0);