/*
* Driver for Blackfin On-Chip SPI device
*
- * Copyright (c) 2005-2008 Analog Devices Inc.
+ * Copyright (c) 2005-2010 Analog Devices Inc.
*
- * Licensed under the GPL-2 or later.
+ * SPDX-License-Identifier: GPL-2.0+
*/
/*#define DEBUG*/
#include <common.h>
+#include <console.h>
#include <malloc.h>
#include <spi.h>
#include <asm/blackfin.h>
+#include <asm/clock.h>
+#include <asm/gpio.h>
+#include <asm/portmux.h>
#include <asm/mach-common/bits/spi.h>
struct bfin_spi_slave {
#define to_bfin_spi_slave(s) container_of(s, struct bfin_spi_slave, slave)
-__attribute__((weak))
+#define gpio_cs(cs) ((cs) - MAX_CTRL_CS)
+#ifdef CONFIG_BFIN_SPI_GPIO_CS
+# define is_gpio_cs(cs) ((cs) > MAX_CTRL_CS)
+#else
+# define is_gpio_cs(cs) 0
+#endif
+
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
- return (cs >= 1 && cs <= 7);
+ if (is_gpio_cs(cs))
+ return gpio_is_valid(gpio_cs(cs));
+ else
+ return (cs >= 1 && cs <= MAX_CTRL_CS);
}
-__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));
+
+ if (is_gpio_cs(slave->cs)) {
+ unsigned int cs = gpio_cs(slave->cs);
+ gpio_set_value(cs, bss->flg);
+ debug("%s: SPI_CS_GPIO:%x\n", __func__, gpio_get_value(cs));
+ } else {
+ 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));
+ }
+
+ SSYNC();
}
-__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));
+
+ if (is_gpio_cs(slave->cs)) {
+ unsigned int cs = gpio_cs(slave->cs);
+ gpio_set_value(cs, !bss->flg);
+ debug("%s: SPI_CS_GPIO:%x\n", __func__, gpio_get_value(cs));
+ } else {
+ u16 flg;
+
+ /* make sure we force the cs to deassert rather than let the
+ * pin float back up. otherwise, exact timings may not be
+ * met some of the time leading to random behavior (ugh).
+ */
+ flg = read_SPI_FLG(bss) | ((!bss->flg << 8) << slave->cs);
+ write_SPI_FLG(bss, flg);
+ SSYNC();
+ debug("%s: SPI_FLG:%x\n", __func__, read_SPI_FLG(bss));
+
+ flg &= ~(1 << slave->cs);
+ write_SPI_FLG(bss, flg);
+ debug("%s: SPI_FLG:%x\n", __func__, read_SPI_FLG(bss));
+ }
+
+ SSYNC();
}
void spi_init()
{
}
+#ifdef SPI_CTL
+# define SPI0_CTL SPI_CTL
+#endif
+
+#define SPI_PINS(n) \
+ [n] = { 0, P_SPI##n##_SCK, P_SPI##n##_MISO, P_SPI##n##_MOSI, 0 }
+static unsigned short pins[][5] = {
+#ifdef SPI0_CTL
+ SPI_PINS(0),
+#endif
+#ifdef SPI1_CTL
+ SPI_PINS(1),
+#endif
+#ifdef SPI2_CTL
+ SPI_PINS(2),
+#endif
+};
+
+#define SPI_CS_PINS(n) \
+ [n] = { \
+ P_SPI##n##_SSEL1, P_SPI##n##_SSEL2, P_SPI##n##_SSEL3, \
+ P_SPI##n##_SSEL4, P_SPI##n##_SSEL5, P_SPI##n##_SSEL6, \
+ P_SPI##n##_SSEL7, \
+ }
+static const unsigned short cs_pins[][7] = {
+#ifdef SPI0_CTL
+ SPI_CS_PINS(0),
+#endif
+#ifdef SPI1_CTL
+ SPI_CS_PINS(1),
+#endif
+#ifdef SPI2_CTL
+ SPI_CS_PINS(2),
+#endif
+};
+
+void spi_set_speed(struct spi_slave *slave, uint hz)
+{
+ struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
+ ulong clk;
+ u32 baud;
+
+ clk = get_spi_clk();
+ /* baud should be rounded up */
+ baud = DIV_ROUND_UP(clk, 2 * hz);
+ if (baud < 2)
+ baud = 2;
+ else if (baud > (u16)-1)
+ baud = -1;
+ bss->baud = baud;
+}
+
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
+#ifdef SPI0_CTL
+ case 0:
+ mmr_base = SPI0_CTL; break;
#endif
- case 0: mmr_base = SPI0_CTL; break;
#ifdef SPI1_CTL
- case 1: mmr_base = SPI1_CTL; break;
+ case 1:
+ mmr_base = SPI1_CTL; break;
#endif
#ifdef SPI2_CTL
- case 2: mmr_base = SPI2_CTL; break;
+ case 2:
+ mmr_base = SPI2_CTL; break;
#endif
- default: return NULL;
+ default:
+ debug("%s: invalid bus %u\n", __func__, bus);
+ return NULL;
}
- baud = get_sclk() / (2 * max_hz);
- if (baud < 2)
- baud = 2;
- else if (baud > (u16)-1)
- baud = -1;
-
- bss = malloc(sizeof(*bss));
+ bss = spi_alloc_slave(struct bfin_spi_slave, bus, cs);
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;
+ spi_set_speed(&bss->slave, max_hz);
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);
+ bus, cs, mmr_base, bss->ctl, bss->baud, bss->flg);
return &bss->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();
- /* set SCK/MISO/MOSI */
- f_fer |= PF11 | PF12 | PF13;
- switch (slave->cs) {
- case 1: f_fer |= PF10; break;
- case 2: mux |= PJSE; break;
- case 3: mux |= PJSE; 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; break;
- }
- bfin_write_PORT_MUX(mux);
- bfin_write_PORTF_FER(f_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);
+ if (is_gpio_cs(slave->cs)) {
+ unsigned int cs = gpio_cs(slave->cs);
+ gpio_request(cs, "bfin-spi");
+ gpio_direction_output(cs, !bss->flg);
+ pins[slave->bus][0] = P_DONTCARE;
+ } else
+ pins[slave->bus][0] = cs_pins[slave->bus][slave->cs - 1];
+ peripheral_request_list(pins[slave->bus], "bfin-spi");
+
write_SPI_CTL(bss, bss->ctl);
write_SPI_BAUD(bss, bss->baud);
SSYNC();
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);
+
+ peripheral_free_list(pins[slave->bus]);
+ if (is_gpio_cs(slave->cs))
+ gpio_free(gpio_cs(slave->cs));
+
write_SPI_CTL(bss, 0);
SSYNC();
}
+#ifndef CONFIG_BFIN_SPI_IDLE_VAL
+# define CONFIG_BFIN_SPI_IDLE_VAL 0xff
+#endif
+
+static int spi_pio_xfer(struct bfin_spi_slave *bss, const u8 *tx, u8 *rx,
+ uint bytes)
+{
+ /* discard invalid data and clear RXS */
+ read_SPI_RDBR(bss);
+ /* todo: take advantage of hardware fifos */
+ while (bytes--) {
+ u8 value = (tx ? *tx++ : CONFIG_BFIN_SPI_IDLE_VAL);
+ debug("%s: tx:%x ", __func__, value);
+ write_SPI_TDBR(bss, value);
+ SSYNC();
+ while ((read_SPI_STAT(bss) & TXS))
+ if (ctrlc())
+ return -1;
+ while (!(read_SPI_STAT(bss) & SPIF))
+ if (ctrlc())
+ return -1;
+ while (!(read_SPI_STAT(bss) & RXS))
+ if (ctrlc())
+ return -1;
+ value = read_SPI_RDBR(bss);
+ if (rx)
+ *rx++ = value;
+ debug("rx:%x\n", value);
+ }
+
+ return 0;
+}
+
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
{
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);
- }
+ ret = spi_pio_xfer(bss, tx, rx, bytes);
done:
if (flags & SPI_XFER_END)
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