X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=drivers%2Fspi%2Fbfin_spi.c;h=e0ad0298d8abd1b6574e9b5f59ed18bff895ea22;hb=67bd94148e4a728379f7c748f5e101612a92651a;hp=0472c1a72fa29b6a02f18f6b07f329b0ee7b88e4;hpb=2c5bd16af132bb6e9158c43fc6206fa0f1f501c1;p=u-boot diff --git a/drivers/spi/bfin_spi.c b/drivers/spi/bfin_spi.c index 0472c1a72f..e0ad0298d8 100644 --- a/drivers/spi/bfin_spi.c +++ b/drivers/spi/bfin_spi.c @@ -13,6 +13,8 @@ #include #include +#include +#include #include struct bfin_spi_slave { @@ -33,50 +35,129 @@ MAKE_SPI_FUNC(SPI_BAUD, 0x14) #define to_bfin_spi_slave(s) container_of(s, struct bfin_spi_slave, slave) -__attribute__((weak)) +#define MAX_CTRL_CS 7 + +#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 +}; + struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, unsigned int max_hz, unsigned int mode) { struct bfin_spi_slave *bss; + ulong sclk; u32 mmr_base; u32 baud; if (!spi_cs_is_valid(bus, cs)) return NULL; + if (bus >= ARRAY_SIZE(pins) || pins[bus] == NULL) { + debug("%s: invalid bus %u\n", __func__, bus); + return NULL; + } switch (bus) { -#ifdef SPI_CTL -# define SPI0_CTL SPI_CTL -#endif +#ifdef SPI0_CTL case 0: mmr_base = SPI0_CTL; break; +#endif #ifdef SPI1_CTL case 1: mmr_base = SPI1_CTL; break; #endif @@ -86,7 +167,11 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, default: return NULL; } - baud = get_sclk() / (2 * max_hz); + sclk = get_sclk(); + baud = sclk / (2 * max_hz); + /* baud should be rounded up */ + if (sclk % (2 * max_hz)) + baud += 1; if (baud < 2) baud = 2; else if (baud > (u16)-1) @@ -118,155 +203,21 @@ void spi_free_slave(struct 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(); - /* 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(); @@ -277,11 +228,21 @@ int spi_claim_bus(struct spi_slave *slave) 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 + int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, void *din, unsigned long flags) { @@ -308,7 +269,7 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, /* todo: take advantage of hardware fifos and setup RX dma */ while (bytes--) { - u8 value = (tx ? *tx++ : 0); + u8 value = (tx ? *tx++ : CONFIG_BFIN_SPI_IDLE_VAL); debug("%s: tx:%x ", __func__, value); write_SPI_TDBR(bss, value); SSYNC();