4 * Copyright (c) 2011-2013 The Chromium OS Authors.
5 * See file CREDITS for list of people who contributed to this
8 * Licensed under the GPL-2 or later.
16 #include <asm/errno.h>
18 #include <asm/state.h>
20 #ifndef CONFIG_SPI_IDLE_VAL
21 # define CONFIG_SPI_IDLE_VAL 0xFF
24 struct sandbox_spi_slave {
25 struct spi_slave slave;
26 const struct sandbox_spi_emu_ops *ops;
30 #define to_sandbox_spi_slave(s) container_of(s, struct sandbox_spi_slave, slave)
32 const char *sandbox_spi_parse_spec(const char *arg, unsigned long *bus,
37 *bus = simple_strtoul(arg, &endp, 0);
38 if (*endp != ':' || *bus >= CONFIG_SANDBOX_SPI_MAX_BUS)
41 *cs = simple_strtoul(endp + 1, &endp, 0);
42 if (*endp != ':' || *cs >= CONFIG_SANDBOX_SPI_MAX_CS)
48 int spi_cs_is_valid(unsigned int bus, unsigned int cs)
50 return bus < CONFIG_SANDBOX_SPI_MAX_BUS &&
51 cs < CONFIG_SANDBOX_SPI_MAX_CS;
54 void spi_cs_activate(struct spi_slave *slave)
56 struct sandbox_spi_slave *sss = to_sandbox_spi_slave(slave);
58 debug("sandbox_spi: activating CS\n");
59 if (sss->ops->cs_activate)
60 sss->ops->cs_activate(sss->priv);
63 void spi_cs_deactivate(struct spi_slave *slave)
65 struct sandbox_spi_slave *sss = to_sandbox_spi_slave(slave);
67 debug("sandbox_spi: deactivating CS\n");
68 if (sss->ops->cs_deactivate)
69 sss->ops->cs_deactivate(sss->priv);
76 void spi_set_speed(struct spi_slave *slave, uint hz)
80 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
81 unsigned int max_hz, unsigned int mode)
83 struct sandbox_spi_slave *sss;
84 struct sandbox_state *state = state_get_current();
87 if (!spi_cs_is_valid(bus, cs)) {
88 debug("sandbox_spi: Invalid SPI bus/cs\n");
92 sss = spi_alloc_slave(struct sandbox_spi_slave, bus, cs);
94 debug("sandbox_spi: Out of memory\n");
98 spec = state->spi[bus][cs].spec;
99 sss->ops = state->spi[bus][cs].ops;
100 if (!spec || !sss->ops || sss->ops->setup(&sss->priv, spec)) {
102 printf("sandbox_spi: unable to locate a slave client\n");
109 void spi_free_slave(struct spi_slave *slave)
111 struct sandbox_spi_slave *sss = to_sandbox_spi_slave(slave);
113 debug("sandbox_spi: releasing slave\n");
116 sss->ops->free(sss->priv);
121 static int spi_bus_claim_cnt[CONFIG_SANDBOX_SPI_MAX_BUS];
123 int spi_claim_bus(struct spi_slave *slave)
125 if (spi_bus_claim_cnt[slave->bus]++) {
126 printf("sandbox_spi: error: bus already claimed: %d!\n",
127 spi_bus_claim_cnt[slave->bus]);
133 void spi_release_bus(struct spi_slave *slave)
135 if (--spi_bus_claim_cnt[slave->bus]) {
136 printf("sandbox_spi: error: bus freed too often: %d!\n",
137 spi_bus_claim_cnt[slave->bus]);
141 int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
142 void *din, unsigned long flags)
144 struct sandbox_spi_slave *sss = to_sandbox_spi_slave(slave);
145 uint bytes = bitlen / 8, i;
147 u8 *tx = (void *)dout, *rx = din;
152 /* we can only do 8 bit transfers */
154 printf("sandbox_spi: xfer: invalid bitlen size %u; needs to be 8bit\n",
156 flags |= SPI_XFER_END;
160 if (flags & SPI_XFER_BEGIN)
161 spi_cs_activate(slave);
163 /* make sure rx/tx buffers are full so clients can assume */
165 debug("sandbox_spi: xfer: auto-allocating tx scratch buffer\n");
168 debug("sandbox_spi: Out of memory\n");
173 debug("sandbox_spi: xfer: auto-allocating rx scratch buffer\n");
176 debug("sandbox_spi: Out of memory\n");
181 debug("sandbox_spi: xfer: bytes = %u\n tx:", bytes);
182 for (i = 0; i < bytes; ++i)
183 debug(" %u:%02x", i, tx[i]);
186 ret = sss->ops->xfer(sss->priv, tx, rx, bytes);
188 debug("sandbox_spi: xfer: got back %i (that's %s)\n rx:",
189 ret, ret ? "bad" : "good");
190 for (i = 0; i < bytes; ++i)
191 debug(" %u:%02x", i, rx[i]);
200 if (flags & SPI_XFER_END)
201 spi_cs_deactivate(slave);
207 * Set up a new SPI slave for an fdt node
209 * @param blob Device tree blob
210 * @param node SPI peripheral node to use
211 * @return 0 if ok, -1 on error
213 struct spi_slave *spi_setup_slave_fdt(const void *blob, int slave_node,