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-rw-r--r--drivers/spi/Makefile1
-rw-r--r--drivers/spi/exynos_spi.c107
-rw-r--r--drivers/spi/ti_qspi.c311
3 files changed, 400 insertions, 19 deletions
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 91d24cea5..e5941b09f 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -38,6 +38,7 @@ COBJS-$(CONFIG_FDT_SPI) += fdt_spi.o
COBJS-$(CONFIG_TEGRA20_SFLASH) += tegra20_sflash.o
COBJS-$(CONFIG_TEGRA20_SLINK) += tegra20_slink.o
COBJS-$(CONFIG_TEGRA114_SPI) += tegra114_spi.o
+COBJS-$(CONFIG_TI_QSPI) += ti_qspi.o
COBJS-$(CONFIG_XILINX_SPI) += xilinx_spi.o
COBJS-$(CONFIG_ZYNQ_SPI) += zynq_spi.o
diff --git a/drivers/spi/exynos_spi.c b/drivers/spi/exynos_spi.c
index efc8b1e3a..699c57eb6 100644
--- a/drivers/spi/exynos_spi.c
+++ b/drivers/spi/exynos_spi.c
@@ -26,6 +26,7 @@ struct spi_bus {
struct exynos_spi *regs;
int inited; /* 1 if this bus is ready for use */
int node;
+ uint deactivate_delay_us; /* Delay to wait after deactivate */
};
/* A list of spi buses that we know about */
@@ -40,6 +41,8 @@ struct exynos_spi_slave {
enum periph_id periph_id; /* Peripheral ID for this device */
unsigned int fifo_size;
int skip_preamble;
+ struct spi_bus *bus; /* Pointer to our SPI bus info */
+ ulong last_transaction_us; /* Time of last transaction end */
};
static struct spi_bus *spi_get_bus(unsigned dev_index)
@@ -85,6 +88,7 @@ struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
}
bus = &spi_bus[busnum];
+ spi_slave->bus = bus;
spi_slave->regs = bus->regs;
spi_slave->mode = mode;
spi_slave->periph_id = bus->periph_id;
@@ -95,6 +99,7 @@ struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
spi_slave->fifo_size = 256;
spi_slave->skip_preamble = 0;
+ spi_slave->last_transaction_us = timer_get_us();
spi_slave->freq = bus->frequency;
if (max_hz)
@@ -199,12 +204,29 @@ static void spi_get_fifo_levels(struct exynos_spi *regs,
*
* @param regs SPI peripheral registers
* @param count Number of bytes to transfer
+ * @param step Number of bytes to transfer in each packet (1 or 4)
*/
-static void spi_request_bytes(struct exynos_spi *regs, int count)
+static void spi_request_bytes(struct exynos_spi *regs, int count, int step)
{
+ /* For word address we need to swap bytes */
+ if (step == 4) {
+ setbits_le32(&regs->mode_cfg,
+ SPI_MODE_CH_WIDTH_WORD | SPI_MODE_BUS_WIDTH_WORD);
+ count /= 4;
+ setbits_le32(&regs->swap_cfg, SPI_TX_SWAP_EN | SPI_RX_SWAP_EN |
+ SPI_TX_BYTE_SWAP | SPI_RX_BYTE_SWAP |
+ SPI_TX_HWORD_SWAP | SPI_RX_HWORD_SWAP);
+ } else {
+ /* Select byte access and clear the swap configuration */
+ clrbits_le32(&regs->mode_cfg,
+ SPI_MODE_CH_WIDTH_WORD | SPI_MODE_BUS_WIDTH_WORD);
+ writel(0, &regs->swap_cfg);
+ }
+
assert(count && count < (1 << 16));
setbits_le32(&regs->ch_cfg, SPI_CH_RST);
clrbits_le32(&regs->ch_cfg, SPI_CH_RST);
+
writel(count | SPI_PACKET_CNT_EN, &regs->pkt_cnt);
}
@@ -219,6 +241,7 @@ static int spi_rx_tx(struct exynos_spi_slave *spi_slave, int todo,
int toread;
unsigned start = get_timer(0);
int stopping;
+ int step;
out_bytes = in_bytes = todo;
@@ -226,10 +249,19 @@ static int spi_rx_tx(struct exynos_spi_slave *spi_slave, int todo,
!(spi_slave->mode & SPI_SLAVE);
/*
+ * Try to transfer words if we can. This helps read performance at
+ * SPI clock speeds above about 20MHz.
+ */
+ step = 1;
+ if (!((todo | (uintptr_t)rxp | (uintptr_t)txp) & 3) &&
+ !spi_slave->skip_preamble)
+ step = 4;
+
+ /*
* If there's something to send, do a software reset and set a
* transaction size.
*/
- spi_request_bytes(regs, todo);
+ spi_request_bytes(regs, todo, step);
/*
* Bytes are transmitted/received in pairs. Wait to receive all the
@@ -242,24 +274,42 @@ static int spi_rx_tx(struct exynos_spi_slave *spi_slave, int todo,
/* Keep the fifos full/empty. */
spi_get_fifo_levels(regs, &rx_lvl, &tx_lvl);
- if (tx_lvl < spi_slave->fifo_size && out_bytes) {
- temp = txp ? *txp++ : 0xff;
+
+ /*
+ * Don't completely fill the txfifo, since we don't want our
+ * rxfifo to overflow, and it may already contain data.
+ */
+ while (tx_lvl < spi_slave->fifo_size/2 && out_bytes) {
+ if (!txp)
+ temp = -1;
+ else if (step == 4)
+ temp = *(uint32_t *)txp;
+ else
+ temp = *txp;
writel(temp, &regs->tx_data);
- out_bytes--;
+ out_bytes -= step;
+ if (txp)
+ txp += step;
+ tx_lvl += step;
}
- if (rx_lvl > 0) {
- temp = readl(&regs->rx_data);
- if (spi_slave->skip_preamble) {
- if (temp == SPI_PREAMBLE_END_BYTE) {
- spi_slave->skip_preamble = 0;
- stopping = 0;
+ if (rx_lvl >= step) {
+ while (rx_lvl >= step) {
+ temp = readl(&regs->rx_data);
+ if (spi_slave->skip_preamble) {
+ if (temp == SPI_PREAMBLE_END_BYTE) {
+ spi_slave->skip_preamble = 0;
+ stopping = 0;
+ }
+ } else {
+ if (rxp || stopping) {
+ *rxp = temp;
+ rxp += step;
+ }
+ in_bytes -= step;
}
- } else {
- if (rxp || stopping)
- *rxp++ = temp;
- in_bytes--;
+ toread -= step;
+ rx_lvl -= step;
}
- toread--;
} else if (!toread) {
/*
* We have run out of input data, but haven't read
@@ -271,7 +321,7 @@ static int spi_rx_tx(struct exynos_spi_slave *spi_slave, int todo,
out_bytes = in_bytes;
toread = in_bytes;
txp = NULL;
- spi_request_bytes(regs, toread);
+ spi_request_bytes(regs, toread, step);
}
if (spi_slave->skip_preamble && get_timer(start) > 100) {
printf("SPI timeout: in_bytes=%d, out_bytes=%d, ",
@@ -315,10 +365,14 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
if ((flags & SPI_XFER_BEGIN))
spi_cs_activate(slave);
- /* Exynos SPI limits each transfer to 65535 bytes */
+ /*
+ * Exynos SPI limits each transfer to 65535 transfers. To keep
+ * things simple, allow a maximum of 65532 bytes. We could allow
+ * more in word mode, but the performance difference is small.
+ */
bytelen = bitlen / 8;
for (upto = 0; !ret && upto < bytelen; upto += todo) {
- todo = min(bytelen - upto, (1 << 16) - 1);
+ todo = min(bytelen - upto, (1 << 16) - 4);
ret = spi_rx_tx(spi_slave, todo, &din, &dout, flags);
if (ret)
break;
@@ -359,9 +413,22 @@ void spi_cs_activate(struct spi_slave *slave)
{
struct exynos_spi_slave *spi_slave = to_exynos_spi(slave);
+ /* If it's too soon to do another transaction, wait */
+ if (spi_slave->bus->deactivate_delay_us &&
+ spi_slave->last_transaction_us) {
+ ulong delay_us; /* The delay completed so far */
+ delay_us = timer_get_us() - spi_slave->last_transaction_us;
+ if (delay_us < spi_slave->bus->deactivate_delay_us)
+ udelay(spi_slave->bus->deactivate_delay_us - delay_us);
+ }
+
clrbits_le32(&spi_slave->regs->cs_reg, SPI_SLAVE_SIG_INACT);
debug("Activate CS, bus %d\n", spi_slave->slave.bus);
spi_slave->skip_preamble = spi_slave->mode & SPI_PREAMBLE;
+
+ /* Remember time of this transaction so we can honour the bus delay */
+ if (spi_slave->bus->deactivate_delay_us)
+ spi_slave->last_transaction_us = timer_get_us();
}
/**
@@ -411,6 +478,8 @@ static int spi_get_config(const void *blob, int node, struct spi_bus *bus)
/* Use 500KHz as a suitable default */
bus->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
500000);
+ bus->deactivate_delay_us = fdtdec_get_int(blob, node,
+ "spi-deactivate-delay", 0);
return 0;
}
diff --git a/drivers/spi/ti_qspi.c b/drivers/spi/ti_qspi.c
new file mode 100644
index 000000000..5a5b48276
--- /dev/null
+++ b/drivers/spi/ti_qspi.c
@@ -0,0 +1,311 @@
+/*
+ * TI QSPI driver
+ *
+ * Copyright (C) 2013, Texas Instruments, Incorporated
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/omap.h>
+#include <malloc.h>
+#include <spi.h>
+
+/* ti qpsi register bit masks */
+#define QSPI_TIMEOUT 2000000
+#define QSPI_FCLK 192000000
+/* clock control */
+#define QSPI_CLK_EN (1 << 31)
+#define QSPI_CLK_DIV_MAX 0xffff
+/* command */
+#define QSPI_EN_CS(n) (n << 28)
+#define QSPI_WLEN(n) ((n-1) << 19)
+#define QSPI_3_PIN (1 << 18)
+#define QSPI_RD_SNGL (1 << 16)
+#define QSPI_WR_SNGL (2 << 16)
+#define QSPI_INVAL (4 << 16)
+#define QSPI_RD_QUAD (7 << 16)
+/* device control */
+#define QSPI_DD(m, n) (m << (3 + n*8))
+#define QSPI_CKPHA(n) (1 << (2 + n*8))
+#define QSPI_CSPOL(n) (1 << (1 + n*8))
+#define QSPI_CKPOL(n) (1 << (n*8))
+/* status */
+#define QSPI_WC (1 << 1)
+#define QSPI_BUSY (1 << 0)
+#define QSPI_WC_BUSY (QSPI_WC | QSPI_BUSY)
+#define QSPI_XFER_DONE QSPI_WC
+#define MM_SWITCH 0x01
+#define MEM_CS 0x100
+#define MEM_CS_UNSELECT 0xfffff0ff
+#define MMAP_START_ADDR 0x5c000000
+#define CORE_CTRL_IO 0x4a002558
+
+#define QSPI_CMD_READ (0x3 << 0)
+#define QSPI_CMD_READ_QUAD (0x6b << 0)
+#define QSPI_CMD_READ_FAST (0x0b << 0)
+#define QSPI_SETUP0_NUM_A_BYTES (0x2 << 8)
+#define QSPI_SETUP0_NUM_D_BYTES_NO_BITS (0x0 << 10)
+#define QSPI_SETUP0_NUM_D_BYTES_8_BITS (0x1 << 10)
+#define QSPI_SETUP0_READ_NORMAL (0x0 << 12)
+#define QSPI_SETUP0_READ_QUAD (0x3 << 12)
+#define QSPI_CMD_WRITE (0x2 << 16)
+#define QSPI_NUM_DUMMY_BITS (0x0 << 24)
+
+/* ti qspi register set */
+struct ti_qspi_regs {
+ u32 pid;
+ u32 pad0[3];
+ u32 sysconfig;
+ u32 pad1[3];
+ u32 int_stat_raw;
+ u32 int_stat_en;
+ u32 int_en_set;
+ u32 int_en_ctlr;
+ u32 intc_eoi;
+ u32 pad2[3];
+ u32 clk_ctrl;
+ u32 dc;
+ u32 cmd;
+ u32 status;
+ u32 data;
+ u32 setup0;
+ u32 setup1;
+ u32 setup2;
+ u32 setup3;
+ u32 memswitch;
+ u32 data1;
+ u32 data2;
+ u32 data3;
+};
+
+/* ti qspi slave */
+struct ti_qspi_slave {
+ struct spi_slave slave;
+ struct ti_qspi_regs *base;
+ unsigned int mode;
+ u32 cmd;
+ u32 dc;
+};
+
+static inline struct ti_qspi_slave *to_ti_qspi_slave(struct spi_slave *slave)
+{
+ return container_of(slave, struct ti_qspi_slave, slave);
+}
+
+static void ti_spi_setup_spi_register(struct ti_qspi_slave *qslave)
+{
+ struct spi_slave *slave = &qslave->slave;
+ u32 memval = 0;
+
+ slave->memory_map = (void *)MMAP_START_ADDR;
+
+ memval |= QSPI_CMD_READ | QSPI_SETUP0_NUM_A_BYTES |
+ QSPI_SETUP0_NUM_D_BYTES_NO_BITS |
+ QSPI_SETUP0_READ_NORMAL | QSPI_CMD_WRITE |
+ QSPI_NUM_DUMMY_BITS;
+
+ writel(memval, &qslave->base->setup0);
+}
+
+static void ti_spi_set_speed(struct spi_slave *slave, uint hz)
+{
+ struct ti_qspi_slave *qslave = to_ti_qspi_slave(slave);
+ uint clk_div;
+
+ debug("ti_spi_set_speed: hz: %d, clock divider %d\n", hz, clk_div);
+
+ if (!hz)
+ clk_div = 0;
+ else
+ clk_div = (QSPI_FCLK / hz) - 1;
+
+ /* disable SCLK */
+ writel(readl(&qslave->base->clk_ctrl) & ~QSPI_CLK_EN,
+ &qslave->base->clk_ctrl);
+
+ /* assign clk_div values */
+ if (clk_div < 0)
+ clk_div = 0;
+ else if (clk_div > QSPI_CLK_DIV_MAX)
+ clk_div = QSPI_CLK_DIV_MAX;
+
+ /* enable SCLK */
+ writel(QSPI_CLK_EN | clk_div, &qslave->base->clk_ctrl);
+}
+
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+ return 1;
+}
+
+void spi_cs_activate(struct spi_slave *slave)
+{
+ /* CS handled in xfer */
+ return;
+}
+
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+ struct ti_qspi_slave *qslave = to_ti_qspi_slave(slave);
+
+ debug("spi_cs_deactivate: 0x%08x\n", (u32)slave);
+
+ writel(qslave->cmd | QSPI_INVAL, &qslave->base->cmd);
+}
+
+void spi_init(void)
+{
+ /* nothing to do */
+}
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+ unsigned int max_hz, unsigned int mode)
+{
+ struct ti_qspi_slave *qslave;
+
+ qslave = spi_alloc_slave(struct ti_qspi_slave, bus, cs);
+ if (!qslave) {
+ printf("SPI_error: Fail to allocate ti_qspi_slave\n");
+ return NULL;
+ }
+
+ qslave->base = (struct ti_qspi_regs *)QSPI_BASE;
+ qslave->mode = mode;
+
+ ti_spi_set_speed(&qslave->slave, max_hz);
+
+#ifdef CONFIG_TI_SPI_MMAP
+ ti_spi_setup_spi_register(qslave);
+#endif
+
+ return &qslave->slave;
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+ struct ti_qspi_slave *qslave = to_ti_qspi_slave(slave);
+ free(qslave);
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+ struct ti_qspi_slave *qslave = to_ti_qspi_slave(slave);
+
+ debug("spi_claim_bus: bus:%i cs:%i\n", slave->bus, slave->cs);
+
+ qslave->dc = 0;
+ if (qslave->mode & SPI_CPHA)
+ qslave->dc |= QSPI_CKPHA(slave->cs);
+ if (qslave->mode & SPI_CPOL)
+ qslave->dc |= QSPI_CKPOL(slave->cs);
+ if (qslave->mode & SPI_CS_HIGH)
+ qslave->dc |= QSPI_CSPOL(slave->cs);
+
+ writel(qslave->dc, &qslave->base->dc);
+ writel(0, &qslave->base->cmd);
+ writel(0, &qslave->base->data);
+
+ return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+ struct ti_qspi_slave *qslave = to_ti_qspi_slave(slave);
+
+ debug("spi_release_bus: bus:%i cs:%i\n", slave->bus, slave->cs);
+
+ writel(0, &qslave->base->dc);
+ writel(0, &qslave->base->cmd);
+ writel(0, &qslave->base->data);
+}
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
+ void *din, unsigned long flags)
+{
+ struct ti_qspi_slave *qslave = to_ti_qspi_slave(slave);
+ uint words = bitlen >> 3; /* fixed 8-bit word length */
+ const uchar *txp = dout;
+ uchar *rxp = din;
+ uint status;
+ int timeout, val;
+
+ debug("spi_xfer: bus:%i cs:%i bitlen:%i words:%i flags:%lx\n",
+ slave->bus, slave->cs, bitlen, words, flags);
+
+ /* Setup mmap flags */
+ if (flags & SPI_XFER_MMAP) {
+ writel(MM_SWITCH, &qslave->base->memswitch);
+ val = readl(CORE_CTRL_IO);
+ val |= MEM_CS;
+ writel(val, CORE_CTRL_IO);
+ return 0;
+ } else if (flags & SPI_XFER_MMAP_END) {
+ writel(~MM_SWITCH, &qslave->base->memswitch);
+ val = readl(CORE_CTRL_IO);
+ val &= MEM_CS_UNSELECT;
+ writel(val, CORE_CTRL_IO);
+ return 0;
+ }
+
+ if (bitlen == 0)
+ return -1;
+
+ if (bitlen % 8) {
+ debug("spi_xfer: Non byte aligned SPI transfer\n");
+ return -1;
+ }
+
+ /* Setup command reg */
+ qslave->cmd = 0;
+ qslave->cmd |= QSPI_WLEN(8);
+ qslave->cmd |= QSPI_EN_CS(slave->cs);
+ if (flags & SPI_3WIRE)
+ qslave->cmd |= QSPI_3_PIN;
+ qslave->cmd |= 0xfff;
+
+ while (words--) {
+ if (txp) {
+ debug("tx cmd %08x dc %08x data %02x\n",
+ qslave->cmd | QSPI_WR_SNGL, qslave->dc, *txp);
+ writel(*txp++, &qslave->base->data);
+ writel(qslave->cmd | QSPI_WR_SNGL,
+ &qslave->base->cmd);
+ status = readl(&qslave->base->status);
+ timeout = QSPI_TIMEOUT;
+ while ((status & QSPI_WC_BUSY) != QSPI_XFER_DONE) {
+ if (--timeout < 0) {
+ printf("spi_xfer: TX timeout!\n");
+ return -1;
+ }
+ status = readl(&qslave->base->status);
+ }
+ debug("tx done, status %08x\n", status);
+ }
+ if (rxp) {
+ qslave->cmd |= QSPI_RD_SNGL;
+ debug("rx cmd %08x dc %08x\n",
+ qslave->cmd, qslave->dc);
+ writel(qslave->cmd, &qslave->base->cmd);
+ status = readl(&qslave->base->status);
+ timeout = QSPI_TIMEOUT;
+ while ((status & QSPI_WC_BUSY) != QSPI_XFER_DONE) {
+ if (--timeout < 0) {
+ printf("spi_xfer: RX timeout!\n");
+ return -1;
+ }
+ status = readl(&qslave->base->status);
+ }
+ *rxp++ = readl(&qslave->base->data);
+ debug("rx done, status %08x, read %02x\n",
+ status, *(rxp-1));
+ }
+ }
+
+ /* Terminate frame */
+ if (flags & SPI_XFER_END)
+ spi_cs_deactivate(slave);
+
+ return 0;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-10-31 10:40:31 +0000