Commit 400f5778 authored by Mike Frysinger's avatar Mike Frysinger
Browse files

Blackfin: add driver for on-chip SPI controller



This fills out the SPI backend for the Blackfin on-chip SPI peripheral.
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent 7a1e87b1
......@@ -26,6 +26,7 @@ include $(TOPDIR)/config.mk
LIB := $(obj)libspi.a
COBJS-$(CONFIG_ATMEL_SPI) += atmel_spi.o
COBJS-$(CONFIG_BFIN_SPI) += bfin_spi.o
COBJS-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o
COBJS-$(CONFIG_MXC_SPI) += mxc_spi.o
COBJS-$(CONFIG_SOFT_SPI) += soft_spi.o
......
/*
* Driver for Blackfin On-Chip SPI device
*
* Copyright (c) 2005-2008 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
/*#define DEBUG*/
#include <common.h>
#include <malloc.h>
#include <spi.h>
#include <asm/blackfin.h>
#include <asm/mach-common/bits/spi.h>
struct bfin_spi_slave {
struct spi_slave slave;
void *mmr_base;
u16 ctl, baud, flg;
};
#define MAKE_SPI_FUNC(mmr, off) \
static inline void write_##mmr(struct bfin_spi_slave *bss, u16 val) { bfin_write16(bss->mmr_base + off, val); } \
static inline u16 read_##mmr(struct bfin_spi_slave *bss) { return bfin_read16(bss->mmr_base + off); }
MAKE_SPI_FUNC(SPI_CTL, 0x00)
MAKE_SPI_FUNC(SPI_FLG, 0x04)
MAKE_SPI_FUNC(SPI_STAT, 0x08)
MAKE_SPI_FUNC(SPI_TDBR, 0x0c)
MAKE_SPI_FUNC(SPI_RDBR, 0x10)
MAKE_SPI_FUNC(SPI_BAUD, 0x14)
#define to_bfin_spi_slave(s) container_of(s, struct bfin_spi_slave, slave)
__attribute__((weak))
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
return (cs >= 1 && cs <= 7);
}
__attribute__((weak))
void spi_cs_activate(struct spi_slave *slave)
{
struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
write_SPI_FLG(bss,
(read_SPI_FLG(bss) &
~((!bss->flg << 8) << slave->cs)) |
(1 << slave->cs));
debug("%s: SPI_FLG:%x\n", __func__, read_SPI_FLG(bss));
}
__attribute__((weak))
void spi_cs_deactivate(struct spi_slave *slave)
{
struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
write_SPI_FLG(bss, read_SPI_FLG(bss) & ~(1 << slave->cs));
debug("%s: SPI_FLG:%x\n", __func__, read_SPI_FLG(bss));
}
void spi_init()
{
}
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
struct bfin_spi_slave *bss;
u32 mmr_base;
u32 baud;
if (!spi_cs_is_valid(bus, cs))
return NULL;
switch (bus) {
#ifdef SPI_CTL
# define SPI0_CTL SPI_CTL
#endif
case 0: mmr_base = SPI0_CTL; break;
#ifdef SPI1_CTL
case 1: mmr_base = SPI1_CTL; break;
#endif
#ifdef SPI2_CTL
case 2: mmr_base = SPI2_CTL; break;
#endif
default: return NULL;
}
baud = get_sclk() / (2 * max_hz);
if (baud < 2)
baud = 2;
else if (baud > (u16)-1)
baud = -1;
bss = malloc(sizeof(*bss));
if (!bss)
return NULL;
bss->slave.bus = bus;
bss->slave.cs = cs;
bss->mmr_base = (void *)mmr_base;
bss->ctl = SPE | MSTR | TDBR_CORE;
if (mode & SPI_CPHA) bss->ctl |= CPHA;
if (mode & SPI_CPOL) bss->ctl |= CPOL;
if (mode & SPI_LSB_FIRST) bss->ctl |= LSBF;
bss->baud = baud;
bss->flg = mode & SPI_CS_HIGH ? 1 : 0;
debug("%s: bus:%i cs:%i mmr:%x ctl:%x baud:%i flg:%i\n", __func__,
bus, cs, mmr_base, bss->ctl, baud, bss->flg);
return &bss->slave;
}
void spi_free_slave(struct spi_slave *slave)
{
struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
free(bss);
}
static void spi_portmux(struct spi_slave *slave)
{
#if defined(__ADSPBF51x__)
#define SET_MUX(port, mux, func) port##_mux = ((port##_mux & ~PORT_x_MUX_##mux##_MASK) | PORT_x_MUX_##mux##_FUNC_##func)
u16 f_mux = bfin_read_PORTF_MUX();
u16 f_fer = bfin_read_PORTF_FER();
u16 g_mux = bfin_read_PORTG_MUX();
u16 g_fer = bfin_read_PORTG_FER();
u16 h_mux = bfin_read_PORTH_MUX();
u16 h_fer = bfin_read_PORTH_FER();
switch (slave->bus) {
case 0:
/* set SCK/MISO/MOSI */
SET_MUX(g, 7, 1);
g_fer |= PG12 | PG13 | PG14;
switch (slave->cs) {
case 1: SET_MUX(f, 2, 1); f_fer |= PF7; break;
case 2: /* see G above */ g_fer |= PG15; break;
case 3: SET_MUX(h, 1, 3); f_fer |= PH4; break;
case 4: /* no muxing */ break;
case 5: SET_MUX(g, 1, 3); h_fer |= PG3; break;
case 6: /* no muxing */ break;
case 7: /* no muxing */ break;
}
case 1:
/* set SCK/MISO/MOSI */
SET_MUX(h, 0, 2);
h_fer |= PH1 | PH2 | PH3;
switch (slave->cs) {
case 1: SET_MUX(h, 2, 3); h_fer |= PH6; break;
case 2: SET_MUX(f, 0, 3); f_fer |= PF0; break;
case 3: SET_MUX(g, 0, 3); g_fer |= PG0; break;
case 4: SET_MUX(f, 3, 3); f_fer |= PF8; break;
case 5: SET_MUX(g, 6, 3); h_fer |= PG11; break;
case 6: /* no muxing */ break;
case 7: /* no muxing */ break;
}
}
bfin_write_PORTF_MUX(f_mux);
bfin_write_PORTF_FER(f_fer);
bfin_write_PORTG_MUX(g_mux);
bfin_write_PORTG_FER(g_fer);
bfin_write_PORTH_MUX(h_mux);
bfin_write_PORTH_FER(h_fer);
#elif defined(__ADSPBF52x__)
#define SET_MUX(port, mux, func) port##_mux = ((port##_mux & ~PORT_x_MUX_##mux##_MASK) | PORT_x_MUX_##mux##_FUNC_##func)
u16 f_mux = bfin_read_PORTF_MUX();
u16 f_fer = bfin_read_PORTF_FER();
u16 g_mux = bfin_read_PORTG_MUX();
u16 g_fer = bfin_read_PORTG_FER();
u16 h_mux = bfin_read_PORTH_MUX();
u16 h_fer = bfin_read_PORTH_FER();
/* set SCK/MISO/MOSI */
SET_MUX(g, 0, 3);
g_fer |= PG2 | PG3 | PG4;
switch (slave->cs) {
case 1: /* see G above */ g_fer |= PG1; break;
case 2: SET_MUX(f, 4, 3); f_fer |= PF12; break;
case 3: SET_MUX(f, 4, 3); f_fer |= PF13; break;
case 4: SET_MUX(h, 1, 1); h_fer |= PH8; break;
case 5: SET_MUX(h, 2, 1); h_fer |= PH9; break;
case 6: SET_MUX(f, 1, 3); f_fer |= PF9; break;
case 7: SET_MUX(f, 2, 3); f_fer |= PF10; break;
}
bfin_write_PORTF_MUX(f_mux);
bfin_write_PORTF_FER(f_fer);
bfin_write_PORTG_MUX(g_mux);
bfin_write_PORTG_FER(g_fer);
bfin_write_PORTH_MUX(h_mux);
bfin_write_PORTH_FER(h_fer);
#elif defined(__ADSPBF534__) || defined(__ADSPBF536__) || defined(__ADSPBF537__)
u16 mux = bfin_read_PORT_MUX();
u16 f_fer = bfin_read_PORTF_FER();
u16 j_fer = bfin_read_PORTJ_FER();
/* set SCK/MISO/MOSI */
f_fer |= PF11 | PF12 | PF13;
switch (slave->cs) {
case 1: f_fer |= PF10; break;
case 2: mux |= PJSE; j_fer |= PJ11; break;
case 3: mux |= PJSE; j_fer |= PJ10; break;
case 4: mux |= PFS4E; f_fer |= PF6; break;
case 5: mux |= PFS5E; f_fer |= PF5; break;
case 6: mux |= PFS6E; f_fer |= PF4; break;
case 7: mux |= PJCE_SPI; j_fer |= PJ5; break;
}
bfin_write_PORT_MUX(mux);
bfin_write_PORTF_FER(f_fer);
bfin_write_PORTJ_FER(j_fer);
#elif defined(__ADSPBF54x__)
#define DO_MUX(port, pin) \
mux = ((mux & ~PORT_x_MUX_##pin##_MASK) | PORT_x_MUX_##pin##_FUNC_1); \
fer |= P##port##pin;
u32 mux;
u16 fer;
switch (slave->bus) {
case 0:
mux = bfin_read_PORTE_MUX();
fer = bfin_read_PORTE_FER();
/* set SCK/MISO/MOSI */
DO_MUX(E, 0);
DO_MUX(E, 1);
DO_MUX(E, 2);
switch (slave->cs) {
case 1: DO_MUX(E, 4); break;
case 2: DO_MUX(E, 5); break;
case 3: DO_MUX(E, 6); break;
}
bfin_write_PORTE_MUX(mux);
bfin_write_PORTE_FER(fer);
break;
case 1:
mux = bfin_read_PORTG_MUX();
fer = bfin_read_PORTG_FER();
/* set SCK/MISO/MOSI */
DO_MUX(G, 8);
DO_MUX(G, 9);
DO_MUX(G, 10);
switch (slave->cs) {
case 1: DO_MUX(G, 5); break;
case 2: DO_MUX(G, 6); break;
case 3: DO_MUX(G, 7); break;
}
bfin_write_PORTG_MUX(mux);
bfin_write_PORTG_FER(fer);
break;
case 2:
mux = bfin_read_PORTB_MUX();
fer = bfin_read_PORTB_FER();
/* set SCK/MISO/MOSI */
DO_MUX(B, 12);
DO_MUX(B, 13);
DO_MUX(B, 14);
switch (slave->cs) {
case 1: DO_MUX(B, 9); break;
case 2: DO_MUX(B, 10); break;
case 3: DO_MUX(B, 11); break;
}
bfin_write_PORTB_MUX(mux);
bfin_write_PORTB_FER(fer);
break;
}
#endif
}
int spi_claim_bus(struct spi_slave *slave)
{
struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
spi_portmux(slave);
write_SPI_CTL(bss, bss->ctl);
write_SPI_BAUD(bss, bss->baud);
SSYNC();
return 0;
}
void spi_release_bus(struct spi_slave *slave)
{
struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
write_SPI_CTL(bss, 0);
SSYNC();
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
{
struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
const u8 *tx = dout;
u8 *rx = din;
uint bytes = bitlen / 8;
int ret = 0;
debug("%s: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n", __func__,
slave->bus, slave->cs, bitlen, bytes, flags);
if (bitlen == 0)
goto done;
/* we can only do 8 bit transfers */
if (bitlen % 8) {
flags |= SPI_XFER_END;
goto done;
}
if (flags & SPI_XFER_BEGIN)
spi_cs_activate(slave);
/* todo: take advantage of hardware fifos and setup RX dma */
while (bytes--) {
u8 value = (tx ? *tx++ : 0);
debug("%s: tx:%x ", __func__, value);
write_SPI_TDBR(bss, value);
SSYNC();
while ((read_SPI_STAT(bss) & TXS))
if (ctrlc()) {
ret = -1;
goto done;
}
while (!(read_SPI_STAT(bss) & SPIF))
if (ctrlc()) {
ret = -1;
goto done;
}
while (!(read_SPI_STAT(bss) & RXS))
if (ctrlc()) {
ret = -1;
goto done;
}
value = read_SPI_RDBR(bss);
if (rx)
*rx++ = value;
debug("rx:%x\n", value);
}
done:
if (flags & SPI_XFER_END)
spi_cs_deactivate(slave);
return ret;
}
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