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1 | /* |
2 | * (C) Copyright 2009 | |
3 | * Frank Bodammer <frank.bodammer@gcd-solutions.de> | |
4 | * (C) Copyright 2009 Semihalf, Grzegorz Bernacki | |
5 | * | |
6 | * See file CREDITS for list of people who contributed to this | |
7 | * project. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation; either version 2 of | |
12 | * the License, or (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
22 | * MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | #include <common.h> | |
26 | #include <asm/io.h> | |
27 | #include <malloc.h> | |
28 | #include <spi.h> | |
29 | #include <mpc5xxx.h> | |
30 | ||
31 | void spi_init(void) | |
32 | { | |
33 | struct mpc5xxx_spi *spi = (struct mpc5xxx_spi *)MPC5XXX_SPI; | |
34 | /* | |
35 | * Its important to use the correct order when initializing the | |
36 | * registers | |
37 | */ | |
38 | out_8(&spi->ddr, 0x0F); /* set all SPI pins as output */ | |
39 | out_8(&spi->pdr, 0x00); /* set SS low */ | |
40 | /* SPI is master, SS is general purpose output */ | |
41 | out_8(&spi->cr1, SPI_CR_MSTR | SPI_CR_SPE); | |
42 | out_8(&spi->cr2, 0x00); /* normal operation */ | |
43 | out_8(&spi->brr, 0x77); /* baud rate: IPB clock / 2048 */ | |
44 | } | |
45 | ||
46 | struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, | |
47 | unsigned int max_hz, unsigned int mode) | |
48 | { | |
49 | struct spi_slave *slave; | |
50 | ||
51 | slave = malloc(sizeof(struct spi_slave)); | |
52 | if (!slave) | |
53 | return NULL; | |
54 | ||
55 | slave->bus = bus; | |
56 | slave->cs = cs; | |
57 | ||
58 | return slave; | |
59 | } | |
60 | ||
61 | void spi_free_slave(struct spi_slave *slave) | |
62 | { | |
63 | free(slave); | |
64 | } | |
65 | ||
66 | int spi_claim_bus(struct spi_slave *slave) | |
67 | { | |
68 | return 0; | |
69 | } | |
70 | ||
71 | void spi_release_bus(struct spi_slave *slave) | |
72 | { | |
73 | return; | |
74 | } | |
75 | ||
76 | int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, | |
77 | void *din, unsigned long flags) | |
78 | { | |
79 | struct mpc5xxx_spi *spi = (struct mpc5xxx_spi *)MPC5XXX_SPI; | |
80 | int i, iter = bitlen >> 3; | |
81 | const uchar *txp = dout; | |
82 | uchar *rxp = din; | |
83 | ||
84 | debug("spi_xfer: slave %u:%u dout %08X din %08X bitlen %u\n", | |
85 | slave->bus, slave->cs, *(uint *) dout, *(uint *) din, bitlen); | |
86 | ||
87 | if (flags & SPI_XFER_BEGIN) | |
88 | setbits_8(&spi->pdr, SPI_PDR_SS); | |
89 | ||
90 | for (i = 0; i < iter; i++) { | |
91 | udelay(1000); | |
92 | debug("spi_xfer: sending %x\n", txp[i]); | |
93 | out_8(&spi->dr, txp[i]); | |
94 | while (!(in_8(&spi->sr) & SPI_SR_SPIF)) { | |
95 | udelay(1000); | |
96 | if (in_8(&spi->sr) & SPI_SR_WCOL) { | |
97 | rxp[i] = in_8(&spi->dr); | |
98 | puts("spi_xfer: write collision\n"); | |
99 | return -1; | |
100 | } | |
101 | } | |
102 | rxp[i] = in_8(&spi->dr); | |
103 | debug("spi_xfer: received %x\n", rxp[i]); | |
104 | } | |
105 | if (flags & SPI_XFER_END) | |
106 | clrbits_8(&spi->pdr, SPI_PDR_SS); | |
107 | ||
108 | return 0; | |
109 | } |