diff --git a/src/mainboard/google/nyan/Kconfig b/src/mainboard/google/nyan/Kconfig index d936776091..770b1a0ef8 100644 --- a/src/mainboard/google/nyan/Kconfig +++ b/src/mainboard/google/nyan/Kconfig @@ -55,4 +55,20 @@ config BCT_CFG_EMMC endchoice +config BOOT_MEDIA_SPI_BUS + int "SPI bus with boot media ROM" + range 1 6 + depends on BCT_CFG_SPI + default 4 + help + Which SPI bus the boot media is connected to. + +config BOOT_MEDIA_SPI_CHIP_SELECT + int "Chip select for SPI boot media" + range 0 3 + depends on BCT_CFG_SPI + default 0 + help + Which chip select to use for boot media. + endif # BOARD_GOOGLE_NYAN diff --git a/src/mainboard/google/nyan/bootblock.c b/src/mainboard/google/nyan/bootblock.c index fe938b477b..4215a78371 100644 --- a/src/mainboard/google/nyan/bootblock.c +++ b/src/mainboard/google/nyan/bootblock.c @@ -23,6 +23,7 @@ #include #include #include +#include /* FIXME: move back to soc code? */ #include "pmic.h" @@ -61,4 +62,19 @@ void bootblock_mainboard_init(void) i2c_init(4); pmic_init(4); + + /* SPI4 data out (MOSI) */ + pinmux_set_config(PINMUX_SDMMC1_CMD_INDEX, + PINMUX_SDMMC1_CMD_FUNC_SPI4 | PINMUX_INPUT_ENABLE); + /* SPI4 data in (MISO) */ + pinmux_set_config(PINMUX_SDMMC1_DAT1_INDEX, + PINMUX_SDMMC1_DAT1_FUNC_SPI4 | PINMUX_INPUT_ENABLE); + /* SPI4 clock */ + pinmux_set_config(PINMUX_SDMMC1_DAT2_INDEX, + PINMUX_SDMMC1_DAT2_FUNC_SPI4 | PINMUX_INPUT_ENABLE); + /* SPI4 chip select 0 */ + pinmux_set_config(PINMUX_SDMMC1_DAT3_INDEX, + PINMUX_SDMMC1_DAT3_FUNC_SPI4 | PINMUX_INPUT_ENABLE); +// spi_init(); + tegra_spi_init(4); } diff --git a/src/soc/nvidia/tegra124/Kconfig b/src/soc/nvidia/tegra124/Kconfig index b88abb0f53..101415e3c5 100644 --- a/src/soc/nvidia/tegra124/Kconfig +++ b/src/soc/nvidia/tegra124/Kconfig @@ -59,6 +59,14 @@ config STACK_SIZE hex default 0x800 +config CBFS_CACHE_ADDRESS + hex "memory address to put CBFS cache data" + default 0x803c0000 + +config CBFS_CACHE_SIZE + hex "size of CBFS cache data" + default 0x00013000 + choice CONSOLE_SERIAL_TEGRA124_UART_CHOICES prompt "Serial Console UART" default CONSOLE_SERIAL_UARTA diff --git a/src/soc/nvidia/tegra124/Makefile.inc b/src/soc/nvidia/tegra124/Makefile.inc index 3d7d25d6c6..8a8ef67286 100644 --- a/src/soc/nvidia/tegra124/Makefile.inc +++ b/src/soc/nvidia/tegra124/Makefile.inc @@ -4,10 +4,12 @@ bootblock-y += bootblock.c bootblock-y += bootblock_asm.S bootblock-y += cbfs.c bootblock-y += clock.c +bootblock-y += dma.c bootblock-y += i2c.c bootblock-y += dma.c bootblock-y += monotonic_timer.c bootblock-y += power.c +bootblock-y += spi.c bootblock-y += ../tegra/gpio.c bootblock-y += ../tegra/i2c.c bootblock-y += ../tegra/pingroup.c @@ -18,14 +20,18 @@ bootblock-$(CONFIG_CONSOLE_SERIAL_UART) += uart.c endif romstage-y += cbfs.c +romstage-y += dma.c romstage-y += monotonic_timer.c +romstage-y += spi.c romstage-y += timer.c ifeq ($(CONFIG_EARLY_CONSOLE),y) romstage-$(CONFIG_CONSOLE_SERIAL_UART) += uart.c endif ramstage-y += cbfs.c +ramstage-y += dma.c ramstage-y += monotonic_timer.c +ramstage-y += spi.c ramstage-y += timer.c ramstage-$(CONFIG_CONSOLE_SERIAL_UART) += uart.c diff --git a/src/soc/nvidia/tegra124/cbfs.c b/src/soc/nvidia/tegra124/cbfs.c index ede9146180..4497d6aa27 100644 --- a/src/soc/nvidia/tegra124/cbfs.c +++ b/src/soc/nvidia/tegra124/cbfs.c @@ -20,7 +20,11 @@ #include /* This driver serves as a CBFS media source. */ +#include "spi.h" + int init_default_cbfs_media(struct cbfs_media *media) { - return -1; + return initialize_tegra_spi_cbfs_media(media, + (void*)CONFIG_CBFS_CACHE_ADDRESS, + CONFIG_CBFS_CACHE_SIZE); } diff --git a/src/soc/nvidia/tegra124/spi.c b/src/soc/nvidia/tegra124/spi.c new file mode 100644 index 0000000000..926ac364ae --- /dev/null +++ b/src/soc/nvidia/tegra124/spi.c @@ -0,0 +1,595 @@ +/* + * NVIDIA Tegra SPI controller (T114 and later) + * + * Copyright (c) 2010-2013 NVIDIA Corporation + * Copyright (C) 2013 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "dma.h" +#include "spi.h" + +#if defined(CONFIG_DEBUG_SPI) && CONFIG_DEBUG_SPI +# define DEBUG_SPI(x,...) printk(BIOS_DEBUG, "TEGRA_SPI: " x) +#else +# define DEBUG_SPI(x,...) +#endif + +/* + * 64 packets in FIFO mode, BLOCK_SIZE packets in DMA mode. Packets can vary + * in size from 4 to 32 bits. To keep things simple we'll use 8-bit packets. + */ +#define SPI_PACKET_SIZE_BYTES 1 +#define SPI_MAX_TRANSFER_BYTES_FIFO (64 * SPI_PACKET_SIZE_BYTES) +#define SPI_MAX_TRANSFER_BYTES_DMA (65536 * SPI_PACKET_SIZE_BYTES) + +/* COMMAND1 */ +#define SPI_CMD1_GO (1 << 31) +#define SPI_CMD1_M_S (1 << 30) +#define SPI_CMD1_MODE_MASK 0x3 +#define SPI_CMD1_MODE_SHIFT 28 +#define SPI_CMD1_CS_SEL_MASK 0x3 +#define SPI_CMD1_CS_SEL_SHIFT 26 +#define SPI_CMD1_CS_POL_INACTIVE3 (1 << 25) +#define SPI_CMD1_CS_POL_INACTIVE2 (1 << 24) +#define SPI_CMD1_CS_POL_INACTIVE1 (1 << 23) +#define SPI_CMD1_CS_POL_INACTIVE0 (1 << 22) +#define SPI_CMD1_CS_SW_HW (1 << 21) +#define SPI_CMD1_CS_SW_VAL (1 << 20) +#define SPI_CMD1_IDLE_SDA_MASK 0x3 +#define SPI_CMD1_IDLE_SDA_SHIFT 18 +#define SPI_CMD1_BIDIR (1 << 17) +#define SPI_CMD1_LSBI_FE (1 << 16) +#define SPI_CMD1_LSBY_FE (1 << 15) +#define SPI_CMD1_BOTH_EN_BIT (1 << 14) +#define SPI_CMD1_BOTH_EN_BYTE (1 << 13) +#define SPI_CMD1_RX_EN (1 << 12) +#define SPI_CMD1_TX_EN (1 << 11) +#define SPI_CMD1_PACKED (1 << 5) +#define SPI_CMD1_BIT_LEN_MASK 0x1f +#define SPI_CMD1_BIT_LEN_SHIFT 0 + +/* COMMAND2 */ +#define SPI_CMD2_TX_CLK_TAP_DELAY (1 << 6) +#define SPI_CMD2_TX_CLK_TAP_DELAY_MASK (0x3F << 6) +#define SPI_CMD2_RX_CLK_TAP_DELAY (1 << 0) +#define SPI_CMD2_RX_CLK_TAP_DELAY_MASK (0x3F << 0) + +/* SPI_TRANS_STATUS */ +#define SPI_STATUS_RDY (1 << 30) +#define SPI_STATUS_SLV_IDLE_COUNT_MASK 0xff +#define SPI_STATUS_SLV_IDLE_COUNT_SHIFT 16 +#define SPI_STATUS_BLOCK_COUNT 0xffff +#define SPI_STATUS_BLOCK_COUNT_SHIFT 0 + +/* SPI_FIFO_STATUS */ +#define SPI_FIFO_STATUS_CS_INACTIVE (1 << 31) +#define SPI_FIFO_STATUS_FRAME_END (1 << 30) +#define SPI_FIFO_STATUS_RX_FIFO_FLUSH (1 << 15) +#define SPI_FIFO_STATUS_TX_FIFO_FLUSH (1 << 14) +#define SPI_FIFO_STATUS_ERR (1 << 8) +#define SPI_FIFO_STATUS_TX_FIFO_OVF (1 << 7) +#define SPI_FIFO_STATUS_TX_FIFO_UNR (1 << 6) +#define SPI_FIFO_STATUS_RX_FIFO_OVF (1 << 5) +#define SPI_FIFO_STATUS_RX_FIFO_UNR (1 << 4) +#define SPI_FIFO_STATUS_TX_FIFO_FULL (1 << 3) +#define SPI_FIFO_STATUS_TX_FIFO_EMPTY (1 << 2) +#define SPI_FIFO_STATUS_RX_FIFO_FULL (1 << 1) +#define SPI_FIFO_STATUS_RX_FIFO_EMPTY (1 << 0) + +/* SPI_DMA_CTL */ +#define SPI_DMA_CTL_DMA (1 << 31) +#define SPI_DMA_CTL_CONT (1 << 30) +#define SPI_DMA_CTL_IE_RX (1 << 29) +#define SPI_DMA_CTL_IE_TX (1 << 28) +#define SPI_DMA_CTL_RX_TRIG_MASK 0x3 +#define SPI_DMA_CTL_RX_TRIG_SHIFT 19 +#define SPI_DMA_CTL_TX_TRIG_MASK 0x3 +#define SPI_DMA_CTL_TX_TRIG_SHIFT 15 + +/* SPI_DMA_BLK */ +#define SPI_DMA_CTL_BLOCK_SIZE_MASK 0xff +#define SPI_DMA_CTL_BLOCK_SIZE_SHIFT 0 + +struct tegra_spi_regs { + u32 command1; /* 0x000: SPI_COMMAND1 */ + u32 command2; /* 0x004: SPI_COMMAND2 */ + u32 timing1; /* 0x008: SPI_CS_TIM1 */ + u32 timing2; /* 0x00c: SPI_CS_TIM2 */ + u32 trans_status; /* 0x010: SPI_TRANS_STATUS */ + u32 fifo_status; /* 0x014: SPI_FIFO_STATUS */ + u32 tx_data; /* 0x018: SPI_TX_DATA */ + u32 rx_data; /* 0x01c: SPI_RX_DATA */ + u32 dma_ctl; /* 0x020: SPI_DMA_CTL */ + u32 dma_blk; /* 0x024: SPI_DMA_BLK */ + u8 rsvd[0xe0]; /* 0x028-0x107: reserved */ + u32 tx_fifo; /* 0x108: SPI_FIFO1 */ + u8 rsvd2[0x7c]; /* 0x10c-0x187 reserved */ + u32 rx_fifo; /* 0x188: SPI_FIFO2 */ + u32 spare_ctl; /* 0x18c: SPI_SPARE_CTRL */ +} __attribute__((packed)); + +struct tegra_spi_channel tegra_spi_channels[TEGRA124_NUM_SPI_CHANNELS] = { + /* + * Note: Tegra pinmux must be setup for corresponding SPI channel in + * order for its registers to be accessible. If pinmux has not been + * set up, access to the channel's registers will simply hang. + * + * TODO(dhendrix): Clarify or remove this comment (is clock setup + * necessary first, or just pinmux, or both?) + */ + { + .slave = { .bus = 1, }, + .regs = (struct tegra_spi_regs *)TEGRA_SPI1_BASE, + }, + { + .slave = { .bus = 2, }, + .regs = (struct tegra_spi_regs *)TEGRA_SPI2_BASE, + }, + { + .slave = { .bus = 3, }, + .regs = (struct tegra_spi_regs *)TEGRA_SPI3_BASE, + }, + { + .slave = { .bus = 4, }, + .regs = (struct tegra_spi_regs *)TEGRA_SPI4_BASE, + }, + { + .slave = { .bus = 5, }, + .regs = (struct tegra_spi_regs *)TEGRA_SPI5_BASE, + }, + { + .slave = { .bus = 6, }, + .regs = (struct tegra_spi_regs *)TEGRA_SPI6_BASE, + }, +}; + +void spi_init(void) +{ +} + +void tegra_spi_init(unsigned int bus) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(tegra_spi_channels); i++) { + struct tegra_spi_regs *regs; + + if (tegra_spi_channels[i].slave.bus == bus) + regs = tegra_spi_channels[i].regs; + else + continue; + + /* software drives chip-select, set value to high */ + setbits_le32(®s->command1, + SPI_CMD1_CS_SW_HW | SPI_CMD1_CS_SW_VAL); + + /* 8-bit transfers, unpacked mode, most significant bit first */ + clrbits_le32(®s->command1, SPI_CMD1_BIT_LEN_MASK | SPI_CMD1_PACKED); + setbits_le32(®s->command1, 7 << SPI_CMD1_BIT_LEN_SHIFT); + + /* flush FIFOs */ + setbits_le32(®s->fifo_status, SPI_FIFO_STATUS_RX_FIFO_FLUSH | + SPI_FIFO_STATUS_TX_FIFO_FLUSH); + while (read32(®s->fifo_status) & + (SPI_FIFO_STATUS_RX_FIFO_FLUSH | SPI_FIFO_STATUS_TX_FIFO_FLUSH)) + ; + } + printk(BIOS_INFO, "Tegra SPI bus %d initialized.\n", bus); + +} + +static struct tegra_spi_channel * const to_tegra_spi(int bus) { + int i; + struct tegra_spi_channel *channel = NULL; + + for (i = 0; i < ARRAY_SIZE(tegra_spi_channels); i++) { + if (tegra_spi_channels[i].slave.bus == bus) + channel = &tegra_spi_channels[i]; + } + + return channel; +} + +int spi_cs_is_valid(unsigned int bus, unsigned int cs) +{ + if (cs < 0 || cs > 3) + return 0; + if (!to_tegra_spi(bus)) + return 0; + return 1; +} + +void spi_cs_activate(struct spi_slave *slave) +{ + struct tegra_spi_regs *regs = to_tegra_spi(slave->bus)->regs; + u32 val; + + val = read32(®s->command1); + + /* select appropriate chip-select line */ + val &= ~(SPI_CMD1_CS_SEL_MASK << SPI_CMD1_CS_SEL_SHIFT); + val |= (slave->cs << SPI_CMD1_CS_SEL_SHIFT); + + /* drive chip-select with the inverse of the "inactive" value */ + if (val & (SPI_CMD1_CS_POL_INACTIVE0 << slave->cs)) + val &= ~SPI_CMD1_CS_SW_VAL; + else + val |= SPI_CMD1_CS_SW_VAL; + + write32(val, ®s->command1); +} + +void spi_cs_deactivate(struct spi_slave *slave) +{ + struct tegra_spi_regs *regs = to_tegra_spi(slave->bus)->regs; + u32 val; + + val = read32(®s->command1); + + if (val & (SPI_CMD1_CS_POL_INACTIVE0 << slave->cs)) + val |= SPI_CMD1_CS_SW_VAL; + else + val &= ~SPI_CMD1_CS_SW_VAL; + + write32(val, ®s->command1); +} + +static void print_fifo_status(struct tegra_spi_channel *spi) +{ + u32 status = read32(&spi->regs->fifo_status); + + printk(BIOS_DEBUG, "Raw FIFO status: 0x%08x\n", status); + if (status & SPI_FIFO_STATUS_TX_FIFO_OVF) + printk(BIOS_DEBUG, "\tTx overflow detected\n"); + if (status & SPI_FIFO_STATUS_TX_FIFO_UNR) + printk(BIOS_DEBUG, "\tTx underrun detected\n"); + if (status & SPI_FIFO_STATUS_RX_FIFO_OVF) + printk(BIOS_DEBUG, "\tRx overflow detected\n"); + if (status & SPI_FIFO_STATUS_RX_FIFO_UNR) + printk(BIOS_DEBUG, "\tRx underrun detected\n"); + + printk(BIOS_DEBUG, "TX_FIFO: 0x%08x, TX_DATA: 0x%08x\n", + read32(&spi->regs->tx_fifo), read32(&spi->regs->tx_data)); + printk(BIOS_DEBUG, "RX_FIFO: 0x%08x, RX_DATA: 0x%08x\n", + read32(&spi->regs->rx_fifo), read32(&spi->regs->rx_data)); +} + +static void clear_fifo_status(struct tegra_spi_channel *spi) +{ + clrbits_le32(&spi->regs->fifo_status, + (SPI_FIFO_STATUS_ERR | + SPI_FIFO_STATUS_TX_FIFO_OVF | + SPI_FIFO_STATUS_TX_FIFO_UNR | + SPI_FIFO_STATUS_RX_FIFO_OVF | + SPI_FIFO_STATUS_RX_FIFO_UNR) << 4); +} + +static void dump_regs(struct tegra_spi_channel *spi, + struct apb_dma_channel *dma) +{ + printk(BIOS_DEBUG, "DMA regs:\n"); + printk(BIOS_DEBUG, "\tahb_ptr: 0x%08x\n" + "\tapb_ptr: 0x%08x\n" + "\tahb_seq: 0x%08x\n" + "\tapb_seq: 0x%08x\n" + "\tcsr: 0x%08x\n" + "\tcsre: 0x%08x\n" + "\twcount: 0x%08x\n" + "\tdma_byte_sta: 0x%08x\n" + "\tword_transfer: 0x%08x\n", + read32(&dma->regs->ahb_ptr), + read32(&dma->regs->apb_ptr), + read32(&dma->regs->ahb_seq), + read32(&dma->regs->apb_seq), + read32(&dma->regs->csr), + read32(&dma->regs->csre), + read32(&dma->regs->wcount), + read32(&dma->regs->dma_byte_sta), + read32(&dma->regs->word_transfer)); + printk(BIOS_DEBUG, "SPI regs:\n"); + printk(BIOS_DEBUG, "\tdma_blk: 0x%08x\n" + "\tcommand1: 0x%08x\n" + "\tdma_ctl: 0x%08x\n" + "\ttrans_status: 0x%08x\n", + read32(&spi->regs->dma_blk), + read32(&spi->regs->command1), + read32(&spi->regs->dma_ctl), + read32(&spi->regs->trans_status)); +} + +int spi_xfer(struct spi_slave *slave, const void *dout, unsigned int bitsout, + void *din, unsigned int bitsin) +{ + unsigned int out_bytes = bitsout / 8, in_bytes = bitsin / 8; + int ret = 0; + struct apb_dma_channel *dma; + struct tegra_spi_channel *spi = to_tegra_spi(slave->bus); + + ASSERT(bitsout % 8 == 0 && bitsin % 8 == 0); + + /* tegra bus numbers start at 1 */ + ASSERT(slave->bus >= 1 && slave->bus <= TEGRA124_NUM_SPI_CHANNELS); + + dma = dma_claim(); + if (!dma) { + printk(BIOS_ERR, "%s: Unable to claim DMA channel\n", __func__); + return -1; + } + + /* flush FIFOs */ + setbits_le32(&spi->regs->fifo_status, SPI_FIFO_STATUS_RX_FIFO_FLUSH | + SPI_FIFO_STATUS_TX_FIFO_FLUSH); + while (read32(&spi->regs->fifo_status) & (SPI_FIFO_STATUS_RX_FIFO_FLUSH | + SPI_FIFO_STATUS_TX_FIFO_FLUSH)) + ; + + /* A few common parameters used for both transmit and receive */ + /* APB bus width = 8-bits, address wrap for each word */ + clrbits_le32(&dma->regs->apb_seq, 0x7 << 28); + /* AHB 1 word burst, bus width = 32 bits (fixed in hardware), + * no address wrapping */ + clrsetbits_le32(&dma->regs->ahb_seq, + (0x7 << 24) | (0x7 << 16), 0x4 << 24); + /* Set ONCE mode to transfer one "blocK" at a time (64KB). */ + setbits_le32(&dma->regs->csr, 1 << 27); + + /* + * Notes for transmit and receive, experimentally determined (need to + * verify): + * - WCOUNT seems to be an "n-1" count, but the documentation does not + * make this clear. Without the -1 dma_byte_sta will show 1 AHB word + * (4 bytes) higher than it should and Tx overrun / Rx underrun will + * likely occur. + * + * - dma_byte_sta is always a multiple 4, so we check for + * dma_byte_sta < length + * + * - The RDY bit in SPI_TRANS_STATUS needs to be cleared manually + * (set bit to clear) between each transaction. Otherwise the next + * transaction does not start. + */ + if (out_bytes && dout) { + printk(BIOS_SPEW, "%s: Writing %d bytes\n", + __func__, out_bytes); + + /* set AHB & APB address pointers */ + write32((u32)dout, &dma->regs->ahb_ptr); + write32((u32)&spi->regs->tx_fifo, &dma->regs->apb_ptr); + + setbits_le32(&spi->regs->command1, SPI_CMD1_TX_EN); + + /* FIXME: calculate word count so that it corresponds to bus width */ + write32(out_bytes - 1, &dma->regs->wcount); + + /* specify BLOCK_SIZE in SPI_DMA_BLK */ + write32(out_bytes - 1, &spi->regs->dma_blk); + + /* Set DMA direction for AHB (DRAM) --> APB (SPI) */ + setbits_le32(&dma->regs->csr, (1 << 28)); + + /* write to SPI_TRANS_STATUS RDY bit to clear it */ + setbits_le32(&spi->regs->trans_status, SPI_STATUS_RDY); + + dma_start(dma); + /* set DMA bit in SPI_DMA_CTL to start */ + setbits_le32(&spi->regs->dma_ctl, SPI_DMA_CTL_DMA); + + /* FIXME: delay loops should be "thread" friendly */ + while ((read32(&dma->regs->dma_byte_sta) < out_bytes) || + dma_busy(dma)) + ; + dma_stop(dma); + while ((read32(&spi->regs->trans_status) & + SPI_STATUS_BLOCK_COUNT) != out_bytes) + ; + clrbits_le32(&spi->regs->command1, SPI_CMD1_TX_EN); + } + + if (in_bytes && din) { + printk(BIOS_SPEW, "%s: Reading %d bytes\n", + __func__, in_bytes); + + /* set AHB & APB address pointers */ + write32((u32)din, &dma->regs->ahb_ptr); + write32((u32)&spi->regs->rx_fifo, &dma->regs->apb_ptr); + + setbits_le32(&spi->regs->command1, SPI_CMD1_RX_EN); + + write32(in_bytes - 1, &dma->regs->wcount); + + /* specify BLOCK_SIZE in SPI_DMA_BLK */ + write32(in_bytes - 1, &spi->regs->dma_blk); + + /* Set DMA direction for APB (SPI) --> AHB (DRAM) */ + clrbits_le32(&dma->regs->csr, 1 << 28); + + /* write to SPI_TRANS_STATUS RDY bit to clear it */ + setbits_le32(&spi->regs->trans_status, SPI_STATUS_RDY); + + /* set DMA bit in SPI_DMA_CTL to start */ + setbits_le32(&spi->regs->dma_ctl, SPI_DMA_CTL_DMA); + + /* start APBDMA after SPI DMA so we don't read empty bytes from Rx FIFO */ + dma_start(dma); + + /* FIXME: delay loops should be "thread" friendly */ + while ((read32(&spi->regs->trans_status) & + SPI_STATUS_BLOCK_COUNT) != in_bytes) + ; + clrbits_le32(&spi->regs->command1, SPI_CMD1_RX_EN); + + while ((read32(&dma->regs->dma_byte_sta) < in_bytes) || + dma_busy(dma)) + ; + dma_stop(dma); + } + + dma_release(dma); + + /* + * FIXME: 4-byte unaligned transfers will cause FIFO overrun/underruns. + * The DMA controller will attempt to send/receive more bytes than it + * should, but the SPI controller is smart enough not to attempt to + * transmit more bytes than BLOCK_SIZE in the SPI_DMA_BLK register. + */ + if (din && (in_bytes % 4)) { + if (read32(&spi->regs->fifo_status) & + SPI_FIFO_STATUS_RX_FIFO_UNR) { + printk(BIOS_DEBUG, "SPI: Ignoring Rx FIFO underrun.\n"); + setbits_le32(&spi->regs->fifo_status, + SPI_FIFO_STATUS_RX_FIFO_UNR); + } + } + if (dout && (out_bytes % 4)) { + if (read32(&spi->regs->fifo_status) & + SPI_FIFO_STATUS_TX_FIFO_OVF) { + printk(BIOS_DEBUG, "SPI: Ignoring Tx FIFO overrun.\n"); + setbits_le32(&spi->regs->fifo_status, + SPI_FIFO_STATUS_TX_FIFO_OVF); + } + } + + if (read32(&spi->regs->fifo_status) & SPI_FIFO_STATUS_ERR) { + ret = -1; + dump_regs(spi, dma); + print_fifo_status(spi); + clear_fifo_status(spi); + } + + return ret; +} + +/* SPI as CBFS media. */ +struct tegra_spi_media { + struct spi_slave *slave; + struct cbfs_simple_buffer buffer; +}; + +static int tegra_spi_cbfs_open(struct cbfs_media *media) +{ + DEBUG_SPI("tegra_spi_cbfs_open\n"); + return 0; +} + +static int tegra_spi_cbfs_close(struct cbfs_media *media) +{ + DEBUG_SPI("tegra_spi_cbfs_close\n"); + return 0; +} + +#define JEDEC_READ 0x03 +#define JEDEC_READ_OUTSIZE 0x04 +/* JEDEC_READ_INSIZE : any length */ + +static size_t tegra_spi_cbfs_read(struct cbfs_media *media, void *dest, + size_t offset, size_t count) +{ + struct tegra_spi_media *spi = (struct tegra_spi_media *)media->context; + u8 spi_read_cmd[JEDEC_READ_OUTSIZE]; + int ret = count; + + /* TODO: Dual mode (BOTH_EN_BIT) and packed mode */ + + spi_read_cmd[0] = JEDEC_READ; + spi_read_cmd[1] = (offset >> 16) & 0xff; + spi_read_cmd[2] = (offset >> 8) & 0xff; + spi_read_cmd[3] = offset & 0xff; + + /* assert /CS */ + spi_cs_activate(spi->slave); + + if (spi_xfer(spi->slave, spi_read_cmd, + sizeof(spi_read_cmd) * 8, NULL, 0) < 0) + goto tegra_spi_cbfs_read_exit; + + while (count > 0) { + unsigned int remaining; + + /* FIXME: shouldn't need to subtract 4 here... */ + remaining = MIN(count, SPI_MAX_TRANSFER_BYTES_DMA - 4); + count -= remaining; + if (spi_xfer(spi->slave, NULL, 0, dest, remaining * 8)) { + ret = -1; + printk(BIOS_ERR, "SPI failed to transfer %u bytes\n", + remaining); + break; + } + } + +tegra_spi_cbfs_read_exit: + /* de-assert /CS */ + spi_cs_deactivate(spi->slave); + return (ret < 0) ? 0 : ret; +} + +static void *tegra_spi_cbfs_map(struct cbfs_media *media, size_t offset, + size_t count) +{ + struct tegra_spi_media *spi = (struct tegra_spi_media*)media->context; + void *map; + DEBUG_SPI("tegra_spi_cbfs_map\n"); + map = cbfs_simple_buffer_map(&spi->buffer, media, offset, count); + printk(BIOS_INFO, "%s: map: 0x%p\n", __func__, map); + return map; +} + +static void *tegra_spi_cbfs_unmap(struct cbfs_media *media, + const void *address) +{ + struct tegra_spi_media *spi = (struct tegra_spi_media*)media->context; + DEBUG_SPI("tegra_spi_cbfs_unmap\n"); + return cbfs_simple_buffer_unmap(&spi->buffer, address); +} + +int initialize_tegra_spi_cbfs_media(struct cbfs_media *media, + void *buffer_address, + size_t buffer_size) +{ + // TODO Replace static variable to support multiple streams. + static struct tegra_spi_media context; + static struct tegra_spi_channel *channel; + + channel = &tegra_spi_channels[CONFIG_BOOT_MEDIA_SPI_BUS - 1]; + channel->slave.cs = CONFIG_BOOT_MEDIA_SPI_CHIP_SELECT; + + DEBUG_SPI("Initializing CBFS media on SPI\n"); + + context.slave = &channel->slave; + context.buffer.allocated = context.buffer.last_allocate = 0; + context.buffer.buffer = buffer_address; + context.buffer.size = buffer_size; + media->context = (void*)&context; + media->open = tegra_spi_cbfs_open; + media->close = tegra_spi_cbfs_close; + media->read = tegra_spi_cbfs_read; + media->map = tegra_spi_cbfs_map; + media->unmap = tegra_spi_cbfs_unmap; + + return 0; +} diff --git a/src/soc/nvidia/tegra124/spi.h b/src/soc/nvidia/tegra124/spi.h new file mode 100644 index 0000000000..41cc9b77b0 --- /dev/null +++ b/src/soc/nvidia/tegra124/spi.h @@ -0,0 +1,46 @@ +/* + * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#ifndef __NVIDIA_TEGRA124_SPI_H__ +#define __NVIDIA_TEGRA124_SPI_H__ + +#include +#include + +struct tegra_spi_channel { + struct spi_slave slave; + struct tegra_spi_regs *regs; + + /* + * max transfer size and dma_buf address will be set by + * mainboard-specific code, depending on the requirements for + * the device connected + */ + unsigned int max_transfer_size; + void *dma_buf; +}; + +#define TEGRA124_NUM_SPI_CHANNELS 6 +extern struct tegra_spi_channel tegra_spi_channels[]; + +struct cbfs_media; +int initialize_tegra_spi_cbfs_media(struct cbfs_media *media, + void *buffer_address, + size_t buffer_size); + +void tegra_spi_init(unsigned int bus); + +#endif /* __NVIDIA_TEGRA124_SPI_H__ */