diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/spi/tegra20_slink.c')
| -rw-r--r-- | qemu/roms/u-boot/drivers/spi/tegra20_slink.c | 359 |
1 files changed, 0 insertions, 359 deletions
diff --git a/qemu/roms/u-boot/drivers/spi/tegra20_slink.c b/qemu/roms/u-boot/drivers/spi/tegra20_slink.c deleted file mode 100644 index 664de6e91..000000000 --- a/qemu/roms/u-boot/drivers/spi/tegra20_slink.c +++ /dev/null @@ -1,359 +0,0 @@ -/* - * NVIDIA Tegra SPI-SLINK controller - * - * Copyright (c) 2010-2013 NVIDIA Corporation - * - * See file CREDITS for list of people who contributed to this - * project. - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * 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., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA - */ - -#include <common.h> -#include <malloc.h> -#include <asm/io.h> -#include <asm/gpio.h> -#include <asm/arch/clock.h> -#include <asm/arch-tegra/clk_rst.h> -#include <asm/arch-tegra20/tegra20_slink.h> -#include <spi.h> -#include <fdtdec.h> - -DECLARE_GLOBAL_DATA_PTR; - -/* COMMAND */ -#define SLINK_CMD_ENB (1 << 31) -#define SLINK_CMD_GO (1 << 30) -#define SLINK_CMD_M_S (1 << 28) -#define SLINK_CMD_CK_SDA (1 << 21) -#define SLINK_CMD_CS_POL (1 << 13) -#define SLINK_CMD_CS_VAL (1 << 12) -#define SLINK_CMD_CS_SOFT (1 << 11) -#define SLINK_CMD_BIT_LENGTH (1 << 4) -#define SLINK_CMD_BIT_LENGTH_MASK 0x0000001F -/* COMMAND2 */ -#define SLINK_CMD2_TXEN (1 << 30) -#define SLINK_CMD2_RXEN (1 << 31) -#define SLINK_CMD2_SS_EN (1 << 18) -#define SLINK_CMD2_SS_EN_SHIFT 18 -#define SLINK_CMD2_SS_EN_MASK 0x000C0000 -#define SLINK_CMD2_CS_ACTIVE_BETWEEN (1 << 17) -/* STATUS */ -#define SLINK_STAT_BSY (1 << 31) -#define SLINK_STAT_RDY (1 << 30) -#define SLINK_STAT_ERR (1 << 29) -#define SLINK_STAT_RXF_FLUSH (1 << 27) -#define SLINK_STAT_TXF_FLUSH (1 << 26) -#define SLINK_STAT_RXF_OVF (1 << 25) -#define SLINK_STAT_TXF_UNR (1 << 24) -#define SLINK_STAT_RXF_EMPTY (1 << 23) -#define SLINK_STAT_RXF_FULL (1 << 22) -#define SLINK_STAT_TXF_EMPTY (1 << 21) -#define SLINK_STAT_TXF_FULL (1 << 20) -#define SLINK_STAT_TXF_OVF (1 << 19) -#define SLINK_STAT_RXF_UNR (1 << 18) -#define SLINK_STAT_CUR_BLKCNT (1 << 15) -/* STATUS2 */ -#define SLINK_STAT2_RXF_FULL_CNT (1 << 16) -#define SLINK_STAT2_TXF_FULL_CNT (1 << 0) - -#define SPI_TIMEOUT 1000 -#define TEGRA_SPI_MAX_FREQ 52000000 - -struct spi_regs { - u32 command; /* SLINK_COMMAND_0 register */ - u32 command2; /* SLINK_COMMAND2_0 reg */ - u32 status; /* SLINK_STATUS_0 register */ - u32 reserved; /* Reserved offset 0C */ - u32 mas_data; /* SLINK_MAS_DATA_0 reg */ - u32 slav_data; /* SLINK_SLAVE_DATA_0 reg */ - u32 dma_ctl; /* SLINK_DMA_CTL_0 register */ - u32 status2; /* SLINK_STATUS2_0 reg */ - u32 rsvd[56]; /* 0x20 to 0xFF reserved */ - u32 tx_fifo; /* SLINK_TX_FIFO_0 reg off 100h */ - u32 rsvd2[31]; /* 0x104 to 0x17F reserved */ - u32 rx_fifo; /* SLINK_RX_FIFO_0 reg off 180h */ -}; - -struct tegra_spi_ctrl { - struct spi_regs *regs; - unsigned int freq; - unsigned int mode; - int periph_id; - int valid; -}; - -struct tegra_spi_slave { - struct spi_slave slave; - struct tegra_spi_ctrl *ctrl; -}; - -static struct tegra_spi_ctrl spi_ctrls[CONFIG_TEGRA_SLINK_CTRLS]; - -static inline struct tegra_spi_slave *to_tegra_spi(struct spi_slave *slave) -{ - return container_of(slave, struct tegra_spi_slave, slave); -} - -int tegra30_spi_cs_is_valid(unsigned int bus, unsigned int cs) -{ - if (bus >= CONFIG_TEGRA_SLINK_CTRLS || cs > 3 || !spi_ctrls[bus].valid) - return 0; - else - return 1; -} - -struct spi_slave *tegra30_spi_setup_slave(unsigned int bus, unsigned int cs, - unsigned int max_hz, unsigned int mode) -{ - struct tegra_spi_slave *spi; - - debug("%s: bus: %u, cs: %u, max_hz: %u, mode: %u\n", __func__, - bus, cs, max_hz, mode); - - if (!spi_cs_is_valid(bus, cs)) { - printf("SPI error: unsupported bus %d / chip select %d\n", - bus, cs); - return NULL; - } - - if (max_hz > TEGRA_SPI_MAX_FREQ) { - printf("SPI error: unsupported frequency %d Hz. Max frequency" - " is %d Hz\n", max_hz, TEGRA_SPI_MAX_FREQ); - return NULL; - } - - spi = spi_alloc_slave(struct tegra_spi_slave, bus, cs); - if (!spi) { - printf("SPI error: malloc of SPI structure failed\n"); - return NULL; - } - spi->ctrl = &spi_ctrls[bus]; - if (!spi->ctrl) { - printf("SPI error: could not find controller for bus %d\n", - bus); - return NULL; - } - - if (max_hz < spi->ctrl->freq) { - debug("%s: limiting frequency from %u to %u\n", __func__, - spi->ctrl->freq, max_hz); - spi->ctrl->freq = max_hz; - } - spi->ctrl->mode = mode; - - return &spi->slave; -} - -void tegra30_spi_free_slave(struct spi_slave *slave) -{ - struct tegra_spi_slave *spi = to_tegra_spi(slave); - - free(spi); -} - -int tegra30_spi_init(int *node_list, int count) -{ - struct tegra_spi_ctrl *ctrl; - int i; - int node = 0; - int found = 0; - - for (i = 0; i < count; i++) { - ctrl = &spi_ctrls[i]; - node = node_list[i]; - - ctrl->regs = (struct spi_regs *)fdtdec_get_addr(gd->fdt_blob, - node, "reg"); - if ((fdt_addr_t)ctrl->regs == FDT_ADDR_T_NONE) { - debug("%s: no slink register found\n", __func__); - continue; - } - ctrl->freq = fdtdec_get_int(gd->fdt_blob, node, - "spi-max-frequency", 0); - if (!ctrl->freq) { - debug("%s: no slink max frequency found\n", __func__); - continue; - } - - ctrl->periph_id = clock_decode_periph_id(gd->fdt_blob, node); - if (ctrl->periph_id == PERIPH_ID_NONE) { - debug("%s: could not decode periph id\n", __func__); - continue; - } - ctrl->valid = 1; - found = 1; - - debug("%s: found controller at %p, freq = %u, periph_id = %d\n", - __func__, ctrl->regs, ctrl->freq, ctrl->periph_id); - } - return !found; -} - -int tegra30_spi_claim_bus(struct spi_slave *slave) -{ - struct tegra_spi_slave *spi = to_tegra_spi(slave); - struct spi_regs *regs = spi->ctrl->regs; - u32 reg; - - /* Change SPI clock to correct frequency, PLLP_OUT0 source */ - clock_start_periph_pll(spi->ctrl->periph_id, CLOCK_ID_PERIPH, - spi->ctrl->freq); - - /* Clear stale status here */ - reg = SLINK_STAT_RDY | SLINK_STAT_RXF_FLUSH | SLINK_STAT_TXF_FLUSH | \ - SLINK_STAT_RXF_UNR | SLINK_STAT_TXF_OVF; - writel(reg, ®s->status); - debug("%s: STATUS = %08x\n", __func__, readl(®s->status)); - - /* Set master mode and sw controlled CS */ - reg = readl(®s->command); - reg |= SLINK_CMD_M_S | SLINK_CMD_CS_SOFT; - writel(reg, ®s->command); - debug("%s: COMMAND = %08x\n", __func__, readl(®s->command)); - - return 0; -} - -void tegra30_spi_cs_activate(struct spi_slave *slave) -{ - struct tegra_spi_slave *spi = to_tegra_spi(slave); - struct spi_regs *regs = spi->ctrl->regs; - - /* CS is negated on Tegra, so drive a 1 to get a 0 */ - setbits_le32(®s->command, SLINK_CMD_CS_VAL); -} - -void tegra30_spi_cs_deactivate(struct spi_slave *slave) -{ - struct tegra_spi_slave *spi = to_tegra_spi(slave); - struct spi_regs *regs = spi->ctrl->regs; - - /* CS is negated on Tegra, so drive a 0 to get a 1 */ - clrbits_le32(®s->command, SLINK_CMD_CS_VAL); -} - -int tegra30_spi_xfer(struct spi_slave *slave, unsigned int bitlen, - const void *data_out, void *data_in, unsigned long flags) -{ - struct tegra_spi_slave *spi = to_tegra_spi(slave); - struct spi_regs *regs = spi->ctrl->regs; - u32 reg, tmpdout, tmpdin = 0; - const u8 *dout = data_out; - u8 *din = data_in; - int num_bytes; - int ret; - - debug("%s: slave %u:%u dout %p din %p bitlen %u\n", - __func__, slave->bus, slave->cs, dout, din, bitlen); - if (bitlen % 8) - return -1; - num_bytes = bitlen / 8; - - ret = 0; - - reg = readl(®s->status); - writel(reg, ®s->status); /* Clear all SPI events via R/W */ - debug("%s entry: STATUS = %08x\n", __func__, reg); - - reg = readl(®s->status2); - writel(reg, ®s->status2); /* Clear all STATUS2 events via R/W */ - debug("%s entry: STATUS2 = %08x\n", __func__, reg); - - debug("%s entry: COMMAND = %08x\n", __func__, readl(®s->command)); - - clrsetbits_le32(®s->command2, SLINK_CMD2_SS_EN_MASK, - SLINK_CMD2_TXEN | SLINK_CMD2_RXEN | - (slave->cs << SLINK_CMD2_SS_EN_SHIFT)); - debug("%s entry: COMMAND2 = %08x\n", __func__, readl(®s->command2)); - - if (flags & SPI_XFER_BEGIN) - spi_cs_activate(slave); - - /* handle data in 32-bit chunks */ - while (num_bytes > 0) { - int bytes; - int is_read = 0; - int tm, i; - - tmpdout = 0; - bytes = (num_bytes > 4) ? 4 : num_bytes; - - if (dout != NULL) { - for (i = 0; i < bytes; ++i) - tmpdout = (tmpdout << 8) | dout[i]; - dout += bytes; - } - - num_bytes -= bytes; - - clrsetbits_le32(®s->command, SLINK_CMD_BIT_LENGTH_MASK, - bytes * 8 - 1); - writel(tmpdout, ®s->tx_fifo); - setbits_le32(®s->command, SLINK_CMD_GO); - - /* - * Wait for SPI transmit FIFO to empty, or to time out. - * The RX FIFO status will be read and cleared last - */ - for (tm = 0, is_read = 0; tm < SPI_TIMEOUT; ++tm) { - u32 status; - - status = readl(®s->status); - - /* We can exit when we've had both RX and TX activity */ - if (is_read && (status & SLINK_STAT_TXF_EMPTY)) - break; - - if ((status & (SLINK_STAT_BSY | SLINK_STAT_RDY)) != - SLINK_STAT_RDY) - tm++; - - else if (!(status & SLINK_STAT_RXF_EMPTY)) { - tmpdin = readl(®s->rx_fifo); - is_read = 1; - - /* swap bytes read in */ - if (din != NULL) { - for (i = bytes - 1; i >= 0; --i) { - din[i] = tmpdin & 0xff; - tmpdin >>= 8; - } - din += bytes; - } - } - } - - if (tm >= SPI_TIMEOUT) - ret = tm; - - /* clear ACK RDY, etc. bits */ - writel(readl(®s->status), ®s->status); - } - - if (flags & SPI_XFER_END) - spi_cs_deactivate(slave); - - debug("%s: transfer ended. Value=%08x, status = %08x\n", - __func__, tmpdin, readl(®s->status)); - - if (ret) { - printf("%s: timeout during SPI transfer, tm %d\n", - __func__, ret); - return -1; - } - - return 0; -} |