dm: spi: zynq_spi: Convert to driver model

This converts the zynq spi driver to use the driver model.

Minimal functional changes like using meaningful name on
structure members wrt mainlined dm spi drivers.
- input_hz -> frequency
- req_hz -> freq
- base -> regs

Signed-off-by: Jagan Teki <jteki@openedev.com>
Acked-by: Simon Glass <sjg@chromium.org>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Tested-by: Jagan Teki <jteki@openedev.com>

drivers/spi/zynq_spi.c

@@ -1,5 +1,6 @@
 /*
  * (C) Copyright 2013 Inc.
+ * (C) Copyright 2015 Jagan Teki <jteki@openedev.com>
  *
  * Xilinx Zynq PS SPI controller driver (master mode only)
  *
@@ -8,6 +9,8 @@
 
 #include <config.h>
 #include <common.h>
+#include <dm.h>
+#include <errno.h>
 #include <malloc.h>
 #include <spi.h>
 #include <asm/io.h>
@@ -44,180 +47,141 @@ struct zynq_spi_regs {
 	u32 rxdr;	/* 0x20 */
 };
 
-/* zynq spi slave */
-struct zynq_spi_slave {
-	struct spi_slave slave;
-	struct zynq_spi_regs *base;
-	u8 mode;
-	u8 fifo_depth;
+
+/* zynq spi platform data */
+struct zynq_spi_platdata {
+	struct zynq_spi_regs *regs;
+	u32 frequency;		/* input frequency */
 	u32 speed_hz;
-	u32 input_hz;
-	u32 req_hz;
 };
 
-static inline struct zynq_spi_slave *to_zynq_spi_slave(struct spi_slave *slave)
-{
-	return container_of(slave, struct zynq_spi_slave, slave);
-}
+/* zynq spi priv */
+struct zynq_spi_priv {
+	struct zynq_spi_regs *regs;
+	u8 mode;
+	u8 fifo_depth;
+	u32 freq;		/* required frequency */
+};
 
-static inline struct zynq_spi_regs *get_zynq_spi_base(int dev)
+static inline struct zynq_spi_regs *get_zynq_spi_regs(struct udevice *bus)
 {
-	if (dev)
+	if (bus->seq)
 		return (struct zynq_spi_regs *)ZYNQ_SPI_BASEADDR1;
 	else
 		return (struct zynq_spi_regs *)ZYNQ_SPI_BASEADDR0;
 }
 
-static void zynq_spi_init_hw(struct zynq_spi_slave *zslave)
+static int zynq_spi_ofdata_to_platdata(struct udevice *bus)
 {
+	struct zynq_spi_platdata *plat = bus->platdata;
+
+	plat->regs = get_zynq_spi_regs(bus);
+	plat->frequency = 166666700;
+	plat->speed_hz = plat->frequency / 2;
+
+	return 0;
+}
+
+static void zynq_spi_init_hw(struct zynq_spi_priv *priv)
+{
+	struct zynq_spi_regs *regs = priv->regs;
 	u32 confr;
 
 	/* Disable SPI */
-	writel(~ZYNQ_SPI_ENR_SPI_EN_MASK, &zslave->base->enr);
+	writel(~ZYNQ_SPI_ENR_SPI_EN_MASK, &regs->enr);
 
 	/* Disable Interrupts */
-	writel(ZYNQ_SPI_IXR_ALL_MASK, &zslave->base->idr);
+	writel(ZYNQ_SPI_IXR_ALL_MASK, &regs->idr);
 
 	/* Clear RX FIFO */
-	while (readl(&zslave->base->isr) &
+	while (readl(&regs->isr) &
 			ZYNQ_SPI_IXR_RXNEMPTY_MASK)
-		readl(&zslave->base->rxdr);
+		readl(&regs->rxdr);
 
 	/* Clear Interrupts */
-	writel(ZYNQ_SPI_IXR_ALL_MASK, &zslave->base->isr);
+	writel(ZYNQ_SPI_IXR_ALL_MASK, &regs->isr);
 
 	/* Manual slave select and Auto start */
 	confr = ZYNQ_SPI_CR_MCS_MASK | ZYNQ_SPI_CR_CS_MASK |
 		ZYNQ_SPI_CR_MSTREN_MASK;
 	confr &= ~ZYNQ_SPI_CR_MSA_MASK;
-	writel(confr, &zslave->base->cr);
+	writel(confr, &regs->cr);
 
 	/* Enable SPI */
-	writel(ZYNQ_SPI_ENR_SPI_EN_MASK, &zslave->base->enr);
+	writel(ZYNQ_SPI_ENR_SPI_EN_MASK, &regs->enr);
 }
 
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+static int zynq_spi_probe(struct udevice *bus)
 {
-	/* 2 bus with 3 chipselect */
-	return bus < 2 && cs < 3;
+	struct zynq_spi_platdata *plat = dev_get_platdata(bus);
+	struct zynq_spi_priv *priv = dev_get_priv(bus);
+
+	priv->regs = plat->regs;
+	priv->fifo_depth = ZYNQ_SPI_FIFO_DEPTH;
+
+	/* init the zynq spi hw */
+	zynq_spi_init_hw(priv);
+
+	return 0;
 }
 
-void spi_cs_activate(struct spi_slave *slave)
+static void spi_cs_activate(struct udevice *dev, uint cs)
 {
-	struct zynq_spi_slave *zslave = to_zynq_spi_slave(slave);
+	struct udevice *bus = dev->parent;
+	struct zynq_spi_priv *priv = dev_get_priv(bus);
+	struct zynq_spi_regs *regs = priv->regs;
 	u32 cr;
 
-	debug("spi_cs_activate: 0x%08x\n", (u32)slave);
-
-	clrbits_le32(&zslave->base->cr, ZYNQ_SPI_CR_CS_MASK);
-	cr = readl(&zslave->base->cr);
+	clrbits_le32(&regs->cr, ZYNQ_SPI_CR_CS_MASK);
+	cr = readl(&regs->cr);
 	/*
 	 * CS cal logic: CS[13:10]
 	 * xxx0	- cs0
 	 * xx01	- cs1
 	 * x011 - cs2
 	 */
-	cr |= (~(0x1 << slave->cs) << 10) & ZYNQ_SPI_CR_CS_MASK;
-	writel(cr, &zslave->base->cr);
+	cr |= (~(0x1 << cs) << 10) & ZYNQ_SPI_CR_CS_MASK;
+	writel(cr, &regs->cr);
 }
 
-void spi_cs_deactivate(struct spi_slave *slave)
+static void spi_cs_deactivate(struct udevice *dev)
 {
-	struct zynq_spi_slave *zslave = to_zynq_spi_slave(slave);
+	struct udevice *bus = dev->parent;
+	struct zynq_spi_priv *priv = dev_get_priv(bus);
+	struct zynq_spi_regs *regs = priv->regs;
 
-	debug("spi_cs_deactivate: 0x%08x\n", (u32)slave);
-
-	setbits_le32(&zslave->base->cr, ZYNQ_SPI_CR_CS_MASK);
+	setbits_le32(&regs->cr, ZYNQ_SPI_CR_CS_MASK);
 }
 
-void spi_init()
+static int zynq_spi_claim_bus(struct udevice *dev)
 {
-	/* nothing to do */
-}
+	struct udevice *bus = dev->parent;
+	struct zynq_spi_priv *priv = dev_get_priv(bus);
+	struct zynq_spi_regs *regs = priv->regs;
 
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
-		unsigned int max_hz, unsigned int mode)
-{
-	struct zynq_spi_slave *zslave;
-
-	if (!spi_cs_is_valid(bus, cs))
-		return NULL;
-
-	zslave = spi_alloc_slave(struct zynq_spi_slave, bus, cs);
-	if (!zslave) {
-		printf("SPI_error: Fail to allocate zynq_spi_slave\n");
-		return NULL;
-	}
-
-	zslave->base = get_zynq_spi_base(bus);
-	zslave->mode = mode;
-	zslave->fifo_depth = ZYNQ_SPI_FIFO_DEPTH;
-	zslave->input_hz = 166666700;
-	zslave->speed_hz = zslave->input_hz / 2;
-	zslave->req_hz = max_hz;
-
-	/* init the zynq spi hw */
-	zynq_spi_init_hw(zslave);
-
-	return &zslave->slave;
-}
-
-void spi_free_slave(struct spi_slave *slave)
-{
-	struct zynq_spi_slave *zslave = to_zynq_spi_slave(slave);
-
-	debug("spi_free_slave: 0x%08x\n", (u32)slave);
-	free(zslave);
-}
-
-int spi_claim_bus(struct spi_slave *slave)
-{
-	struct zynq_spi_slave *zslave = to_zynq_spi_slave(slave);
-	u32 confr = 0;
-	u8 baud_rate_val = 0;
-
-	writel(~ZYNQ_SPI_ENR_SPI_EN_MASK, &zslave->base->enr);
-
-	/* Set the SPI Clock phase and polarities */
-	confr = readl(&zslave->base->cr);
-	confr &= ~(ZYNQ_SPI_CR_CPHA_MASK | ZYNQ_SPI_CR_CPOL_MASK);
-	if (zslave->mode & SPI_CPHA)
-		confr |= ZYNQ_SPI_CR_CPHA_MASK;
-	if (zslave->mode & SPI_CPOL)
-		confr |= ZYNQ_SPI_CR_CPOL_MASK;
-
-	/* Set the clock frequency */
-	if (zslave->req_hz == 0) {
-		/* Set baudrate x8, if the req_hz is 0 */
-		baud_rate_val = 0x2;
-	} else if (zslave->speed_hz != zslave->req_hz) {
-		while ((baud_rate_val < 8) &&
-				((zslave->input_hz /
-				(2 << baud_rate_val)) > zslave->req_hz))
-			baud_rate_val++;
-		zslave->speed_hz = zslave->req_hz / (2 << baud_rate_val);
-	}
-	confr &= ~ZYNQ_SPI_CR_BRD_MASK;
-	confr |= (baud_rate_val << 3);
-	writel(confr, &zslave->base->cr);
-
-	writel(ZYNQ_SPI_ENR_SPI_EN_MASK, &zslave->base->enr);
+	writel(ZYNQ_SPI_ENR_SPI_EN_MASK, &regs->enr);
 
 	return 0;
 }
 
-void spi_release_bus(struct spi_slave *slave)
+static int zynq_spi_release_bus(struct udevice *dev)
 {
-	struct zynq_spi_slave *zslave = to_zynq_spi_slave(slave);
+	struct udevice *bus = dev->parent;
+	struct zynq_spi_priv *priv = dev_get_priv(bus);
+	struct zynq_spi_regs *regs = priv->regs;
 
-	debug("spi_release_bus: 0x%08x\n", (u32)slave);
-	writel(~ZYNQ_SPI_ENR_SPI_EN_MASK, &zslave->base->enr);
+	writel(~ZYNQ_SPI_ENR_SPI_EN_MASK, &regs->enr);
+
+	return 0;
 }
 
-int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
-		void *din, unsigned long flags)
+static int zynq_spi_xfer(struct udevice *dev, unsigned int bitlen,
+			    const void *dout, void *din, unsigned long flags)
 {
-	struct zynq_spi_slave *zslave = to_zynq_spi_slave(slave);
+	struct udevice *bus = dev->parent;
+	struct zynq_spi_priv *priv = dev_get_priv(bus);
+	struct zynq_spi_regs *regs = priv->regs;
+	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
 	u32 len = bitlen / 8;
 	u32 tx_len = len, rx_len = len, tx_tvl;
 	const u8 *tx_buf = dout;
@@ -225,7 +189,7 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
 	u32 ts, status;
 
 	debug("spi_xfer: bus:%i cs:%i bitlen:%i len:%i flags:%lx\n",
-	      slave->bus, slave->cs, bitlen, len, flags);
+	      bus->seq, slave_plat->cs, bitlen, len, flags);
 
 	if (bitlen % 8) {
 		debug("spi_xfer: Non byte aligned SPI transfer\n");
@@ -233,45 +197,126 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
 	}
 
 	if (flags & SPI_XFER_BEGIN)
-		spi_cs_activate(slave);
+		spi_cs_activate(dev, slave_plat->cs);
 
 	while (rx_len > 0) {
 		/* Write the data into TX FIFO - tx threshold is fifo_depth */
 		tx_tvl = 0;
-		while ((tx_tvl < zslave->fifo_depth) && tx_len) {
+		while ((tx_tvl < priv->fifo_depth) && tx_len) {
 			if (tx_buf)
 				buf = *tx_buf++;
 			else
 				buf = 0;
-			writel(buf, &zslave->base->txdr);
+			writel(buf, &regs->txdr);
 			tx_len--;
 			tx_tvl++;
 		}
 
 		/* Check TX FIFO completion */
 		ts = get_timer(0);
-		status = readl(&zslave->base->isr);
+		status = readl(&regs->isr);
 		while (!(status & ZYNQ_SPI_IXR_TXOW_MASK)) {
 			if (get_timer(ts) > CONFIG_SYS_ZYNQ_SPI_WAIT) {
 				printf("spi_xfer: Timeout! TX FIFO not full\n");
 				return -1;
 			}
-			status = readl(&zslave->base->isr);
+			status = readl(&regs->isr);
 		}
 
 		/* Read the data from RX FIFO */
-		status = readl(&zslave->base->isr);
+		status = readl(&regs->isr);
 		while (status & ZYNQ_SPI_IXR_RXNEMPTY_MASK) {
-			buf = readl(&zslave->base->rxdr);
+			buf = readl(&regs->rxdr);
 			if (rx_buf)
 				*rx_buf++ = buf;
-			status = readl(&zslave->base->isr);
+			status = readl(&regs->isr);
 			rx_len--;
 		}
 	}
 
 	if (flags & SPI_XFER_END)
-		spi_cs_deactivate(slave);
+		spi_cs_deactivate(dev);
 
 	return 0;
 }
+
+static int zynq_spi_set_speed(struct udevice *bus, uint speed)
+{
+	struct zynq_spi_platdata *plat = bus->platdata;
+	struct zynq_spi_priv *priv = dev_get_priv(bus);
+	struct zynq_spi_regs *regs = priv->regs;
+	uint32_t confr;
+	u8 baud_rate_val = 0;
+
+	if (speed > plat->frequency)
+		speed = plat->frequency;
+
+	/* Set the clock frequency */
+	confr = readl(&regs->cr);
+	if (speed == 0) {
+		/* Set baudrate x8, if the freq is 0 */
+		baud_rate_val = 0x2;
+	} else if (plat->speed_hz != speed) {
+		while ((baud_rate_val < 8) &&
+				((plat->frequency /
+				(2 << baud_rate_val)) > speed))
+			baud_rate_val++;
+		plat->speed_hz = speed / (2 << baud_rate_val);
+	}
+	confr &= ~ZYNQ_SPI_CR_BRD_MASK;
+	confr |= (baud_rate_val << 3);
+
+	writel(confr, &regs->cr);
+	priv->freq = speed;
+
+	debug("zynq_spi_set_speed: regs=%p, mode=%d\n", priv->regs, priv->freq);
+
+	return 0;
+}
+
+static int zynq_spi_set_mode(struct udevice *bus, uint mode)
+{
+	struct zynq_spi_priv *priv = dev_get_priv(bus);
+	struct zynq_spi_regs *regs = priv->regs;
+	uint32_t confr;
+
+	/* Set the SPI Clock phase and polarities */
+	confr = readl(&regs->cr);
+	confr &= ~(ZYNQ_SPI_CR_CPHA_MASK | ZYNQ_SPI_CR_CPOL_MASK);
+
+	if (priv->mode & SPI_CPHA)
+		confr |= ZYNQ_SPI_CR_CPHA_MASK;
+	if (priv->mode & SPI_CPOL)
+		confr |= ZYNQ_SPI_CR_CPOL_MASK;
+
+	writel(confr, &regs->cr);
+	priv->mode = mode;
+
+	debug("zynq_spi_set_mode: regs=%p, mode=%d\n", priv->regs, priv->mode);
+
+	return 0;
+}
+
+static const struct dm_spi_ops zynq_spi_ops = {
+	.claim_bus	= zynq_spi_claim_bus,
+	.release_bus	= zynq_spi_release_bus,
+	.xfer		= zynq_spi_xfer,
+	.set_speed	= zynq_spi_set_speed,
+	.set_mode	= zynq_spi_set_mode,
+};
+
+static const struct udevice_id zynq_spi_ids[] = {
+	{ .compatible = "xlnx,zynq-spi" },
+	{ }
+};
+
+U_BOOT_DRIVER(zynq_spi) = {
+	.name	= "zynq_spi",
+	.id	= UCLASS_SPI,
+	.of_match = zynq_spi_ids,
+	.ops	= &zynq_spi_ops,
+	.ofdata_to_platdata = zynq_spi_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct zynq_spi_platdata),
+	.priv_auto_alloc_size = sizeof(struct zynq_spi_priv),
+	.probe	= zynq_spi_probe,
+};