From: T Karthik Reddy t.karthik.reddy@xilinx.com
Add support for spi memory operations for xilinx AXI qspi driver. This provides an high-level interface to execute SPI memory operations by the controller.
Remove existing spi transfer based implementation and use spi memory based exec_op() implementation for qspi IO operations.
Simplified existing startup_block implementation.
Signed-off-by: T Karthik Reddy t.karthik.reddy@xilinx.com Signed-off-by: Ashok Reddy Soma ashok.reddy.soma@xilinx.com ---
drivers/spi/xilinx_spi.c | 194 +++++++++++++++++++++++---------------- 1 file changed, 116 insertions(+), 78 deletions(-)
diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c index b892cdae9b..09d4b01631 100644 --- a/drivers/spi/xilinx_spi.c +++ b/drivers/spi/xilinx_spi.c @@ -19,6 +19,7 @@ #include <log.h> #include <malloc.h> #include <spi.h> +#include <spi-mem.h> #include <asm/io.h> #include <wait_bit.h> #include <linux/bitops.h> @@ -73,7 +74,7 @@
#define XILSPI_MAX_XFER_BITS 8 #define XILSPI_SPICR_DFLT_ON (SPICR_MANUAL_SS | SPICR_MASTER_MODE | \ - SPICR_SPE) + SPICR_SPE | SPICR_MASTER_INHIBIT) #define XILSPI_SPICR_DFLT_OFF (SPICR_MASTER_INHIBIT | SPICR_MANUAL_SS)
#define XILINX_SPI_IDLE_VAL GENMASK(7, 0) @@ -119,6 +120,15 @@ static int xilinx_spi_probe(struct udevice *bus)
writel(SPISSR_RESET_VALUE, ®s->srr);
+ /* + * Reset RX & TX FIFO + * Enable Manual Slave Select Assertion, + * Set SPI controller into master mode, and enable it + */ + writel(SPICR_RXFIFO_RESEST | SPICR_TXFIFO_RESEST | + SPICR_MANUAL_SS | SPICR_MASTER_MODE | SPICR_SPE, + ®s->spicr); + return 0; }
@@ -136,7 +146,10 @@ static void spi_cs_deactivate(struct udevice *dev) struct udevice *bus = dev_get_parent(dev); struct xilinx_spi_priv *priv = dev_get_priv(bus); struct xilinx_spi_regs *regs = priv->regs; + u32 reg;
+ reg = readl(®s->spicr) | SPICR_RXFIFO_RESEST | SPICR_TXFIFO_RESEST; + writel(reg, ®s->spicr); writel(SPISSR_OFF, ®s->spissr); }
@@ -205,81 +218,24 @@ static u32 xilinx_spi_read_rxfifo(struct udevice *bus, u8 *rxp, u32 rxbytes) return i; }
-static void xilinx_spi_startup_block(struct udevice *dev, unsigned int bytes, - const void *dout, void *din) +static int start_transfer(struct spi_slave *spi, const void *dout, void *din, u32 len) { - struct udevice *bus = dev_get_parent(dev); + struct udevice *bus = spi->dev->parent; struct xilinx_spi_priv *priv = dev_get_priv(bus); struct xilinx_spi_regs *regs = priv->regs; - struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev); - const unsigned char *txp = dout; - unsigned char *rxp = din; - u32 reg; - u32 txbytes = bytes; - u32 rxbytes = bytes; - - /* - * This loop runs two times. First time to send the command. - * Second time to transfer data. After transferring data, - * it sets txp to the initial value for the normal operation. - */ - for ( ; priv->startup < 2; priv->startup++) { - xilinx_spi_fill_txfifo(bus, txp, txbytes); - reg = readl(®s->spicr) & ~SPICR_MASTER_INHIBIT; + u32 count, txbytes, rxbytes; + int reg, ret; + const unsigned char *txp = (const unsigned char *)dout; + unsigned char *rxp = (unsigned char *)din; + + txbytes = len; + rxbytes = len; + while (txbytes || rxbytes) { + /* Disable master transaction */ + reg = readl(®s->spicr) | SPICR_MASTER_INHIBIT; writel(reg, ®s->spicr); - xilinx_spi_read_rxfifo(bus, rxp, rxbytes); - txp = din; - - if (priv->startup) { - spi_cs_deactivate(dev); - spi_cs_activate(dev, slave_plat->cs); - txp = dout; - } - } -} - -static int xilinx_spi_xfer(struct udevice *dev, unsigned int bitlen, - const void *dout, void *din, unsigned long flags) -{ - struct udevice *bus = dev_get_parent(dev); - struct xilinx_spi_priv *priv = dev_get_priv(bus); - struct xilinx_spi_regs *regs = priv->regs; - struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev); - /* assume spi core configured to do 8 bit transfers */ - unsigned int bytes = bitlen / XILSPI_MAX_XFER_BITS; - const unsigned char *txp = dout; - unsigned char *rxp = din; - u32 txbytes = bytes; - u32 rxbytes = bytes; - u32 reg, count; - int ret; - - debug("spi_xfer: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n", - dev_seq(bus), slave_plat->cs, bitlen, bytes, flags); - - if (bitlen == 0) - goto done; - - if (bitlen % XILSPI_MAX_XFER_BITS) { - printf("XILSPI warning: Not a multiple of %d bits\n", - XILSPI_MAX_XFER_BITS); - flags |= SPI_XFER_END; - goto done; - } - - if (flags & SPI_XFER_BEGIN) - spi_cs_activate(dev, slave_plat->cs); - - /* - * This is the work around for the startup block issue in - * the spi controller. SPI clock is passing through STARTUP - * block to FLASH. STARTUP block don't provide clock as soon - * as QSPI provides command. So first command fails. - */ - xilinx_spi_startup_block(dev, bytes, dout, din); - - while (txbytes && rxbytes) { count = xilinx_spi_fill_txfifo(bus, txp, txbytes); + /* Enable master transaction */ reg = readl(®s->spicr) & ~SPICR_MASTER_INHIBIT; writel(reg, ®s->spicr); txbytes -= count; @@ -293,21 +249,99 @@ static int xilinx_spi_xfer(struct udevice *dev, unsigned int bitlen, return ret; }
- debug("txbytes:0x%x,txp:0x%p\n", txbytes, txp); + reg = readl(®s->spicr) | SPICR_MASTER_INHIBIT; + writel(reg, ®s->spicr); count = xilinx_spi_read_rxfifo(bus, rxp, rxbytes); rxbytes -= count; if (rxp) rxp += count; - debug("rxbytes:0x%x rxp:0x%p\n", rxbytes, rxp); }
- done: - if (flags & SPI_XFER_END) - spi_cs_deactivate(dev); - return 0; }
+static void xilinx_spi_startup_block(struct spi_slave *spi) +{ + struct dm_spi_slave_plat *slave_plat = + dev_get_parent_plat(spi->dev); + unsigned char txp; + unsigned char rxp[8]; + + /* + * Perform a dummy read as a work around for + * the startup block issue. + */ + spi_cs_activate(spi->dev, slave_plat->cs); + txp = 0x9f; + start_transfer(spi, (void *)&txp, NULL, 1); + + start_transfer(spi, NULL, (void *)rxp, 6); + + spi_cs_deactivate(spi->dev); +} + +static int xilinx_spi_mem_exec_op(struct spi_slave *spi, + const struct spi_mem_op *op) +{ + struct dm_spi_slave_plat *slave_plat = + dev_get_parent_plat(spi->dev); + static u32 startup; + u32 dummy_len, ret; + + /* + * This is the work around for the startup block issue in + * the spi controller. SPI clock is passing through STARTUP + * block to FLASH. STARTUP block don't provide clock as soon + * as QSPI provides command. So first command fails. + */ + if (!startup) { + xilinx_spi_startup_block(spi); + startup++; + } + + spi_cs_activate(spi->dev, slave_plat->cs); + + if (op->cmd.opcode) { + ret = start_transfer(spi, (void *)&op->cmd.opcode, NULL, 1); + if (ret) + goto done; + } + if (op->addr.nbytes) { + int i; + u8 addr_buf[4]; + + for (i = 0; i < op->addr.nbytes; i++) + addr_buf[i] = op->addr.val >> + (8 * (op->addr.nbytes - i - 1)); + + ret = start_transfer(spi, (void *)addr_buf, NULL, + op->addr.nbytes); + if (ret) + goto done; + } + if (op->dummy.nbytes) { + dummy_len = op->dummy.nbytes * op->data.buswidth; + ret = start_transfer(spi, NULL, NULL, dummy_len); + if (ret) + goto done; + } + if (op->data.nbytes) { + if (op->data.dir == SPI_MEM_DATA_IN) { + ret = start_transfer(spi, NULL, + op->data.buf.in, op->data.nbytes); + } else { + ret = start_transfer(spi, op->data.buf.out, + NULL, op->data.nbytes); + } + if (ret) + goto done; + } +done: + spi_cs_deactivate(spi->dev); + + return ret; +} + static int xilinx_spi_set_speed(struct udevice *bus, uint speed) { struct xilinx_spi_priv *priv = dev_get_priv(bus); @@ -343,12 +377,16 @@ static int xilinx_spi_set_mode(struct udevice *bus, uint mode) return 0; }
+static const struct spi_controller_mem_ops xilinx_spi_mem_ops = { + .exec_op = xilinx_spi_mem_exec_op, +}; + static const struct dm_spi_ops xilinx_spi_ops = { .claim_bus = xilinx_spi_claim_bus, .release_bus = xilinx_spi_release_bus, - .xfer = xilinx_spi_xfer, .set_speed = xilinx_spi_set_speed, .set_mode = xilinx_spi_set_mode, + .mem_ops = &xilinx_spi_mem_ops, };
static const struct udevice_id xilinx_spi_ids[] = {