dm: spi: xilinx_spi: Convert to driver model

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

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

diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c
index 650e4943520c6bd2d1daa55d2e19dc56625c2d67..4b0b50f704f4c0834491d1ba65cc32534da5366f 100644 (file)
--- a/drivers/spi/xilinx_spi.c
+++ b/drivers/spi/xilinx_spi.c
@@ -4,6 +4,7 @@
  * Supports 8 bit SPI transfers only, with or w/o FIFO
  *
  * Based on bfin_spi.c, by way of altera_spi.c
+ * Copyright (c) 2015 Jagan Teki <jteki@openedev.com>
  * Copyright (c) 2012 Stephan Linz <linz@li-pro.net>
  * Copyright (c) 2010 Graeme Smecher <graeme.smecher@mail.mcgill.ca>
  * Copyright (c) 2010 Thomas Chou <thomas@wytron.com.tw>
@@ -14,6 +15,8 @@
 
 #include <config.h>
 #include <common.h>
+#include <dm.h>
+#include <errno.h>
 #include <malloc.h>
 #include <spi.h>
 
@@ -79,7 +82,7 @@
 #endif
 
 /* xilinx spi register set */
-struct xilinx_spi_reg {
+struct xilinx_spi_regs {
        u32 __space0__[7];
        u32 dgier;      /* Device Global Interrupt Enable Register (DGIER) */
        u32 ipisr;      /* IP Interrupt Status Register (IPISR) */
@@ -97,113 +100,75 @@ struct xilinx_spi_reg {
        u32 spirfor;    /* SPI Receive FIFO Occupancy Register (SPIRFOR) */
 };
 
-/* xilinx spi slave */
-struct xilinx_spi_slave {
-       struct spi_slave slave;
-       struct xilinx_spi_reg *regs;
+/* xilinx spi priv */
+struct xilinx_spi_priv {
+       struct xilinx_spi_regs *regs;
        unsigned int freq;
        unsigned int mode;
 };
 
-static inline struct xilinx_spi_slave *to_xilinx_spi_slave(
-                       struct spi_slave *slave)
-{
-       return container_of(slave, struct xilinx_spi_slave, slave);
-}
-
 static unsigned long xilinx_spi_base_list[] = CONFIG_SYS_XILINX_SPI_LIST;
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+static int xilinx_spi_probe(struct udevice *bus)
 {
-       return bus < ARRAY_SIZE(xilinx_spi_base_list) && cs < 32;
-}
+       struct xilinx_spi_priv *priv = dev_get_priv(bus);
+       struct xilinx_spi_regs *regs = priv->regs;
 
-void spi_cs_activate(struct spi_slave *slave)
-{
-       struct xilinx_spi_slave *xilspi = to_xilinx_spi_slave(slave);
+       priv->regs = (struct xilinx_spi_regs *)xilinx_spi_base_list[bus->seq];
 
-       writel(SPISSR_ACT(slave->cs), &xilspi->regs->spissr);
-}
+       writel(SPISSR_RESET_VALUE, &regs->srr);
 
-void spi_cs_deactivate(struct spi_slave *slave)
-{
-       struct xilinx_spi_slave *xilspi = to_xilinx_spi_slave(slave);
-
-       writel(SPISSR_OFF, &xilspi->regs->spissr);
-}
-
-void spi_init(void)
-{
-       /* do nothing */
+       return 0;
 }
 
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
-                                 unsigned int max_hz, unsigned int mode)
+static void spi_cs_activate(struct udevice *dev, uint cs)
 {
-       struct xilinx_spi_slave *xilspi;
+       struct udevice *bus = dev_get_parent(dev);
+       struct xilinx_spi_priv *priv = dev_get_priv(bus);
+       struct xilinx_spi_regs *regs = priv->regs;
 
-       if (!spi_cs_is_valid(bus, cs)) {
-               printf("XILSPI error: unsupported bus %d / cs %d\n", bus, cs);
-               return NULL;
-       }
-
-       xilspi = spi_alloc_slave(struct xilinx_spi_slave, bus, cs);
-       if (!xilspi) {
-               printf("XILSPI error: malloc of SPI structure failed\n");
-               return NULL;
-       }
-       xilspi->regs = (struct xilinx_spi_reg *)xilinx_spi_base_list[bus];
-       xilspi->freq = max_hz;
-       xilspi->mode = mode;
-       debug("spi_setup_slave: bus:%i cs:%i base:%p mode:%x max_hz:%d\n",
-             bus, cs, xilspi->regs, xilspi->mode, xilspi->freq);
-
-       writel(SPISSR_RESET_VALUE, &xilspi->regs->srr);
-
-       return &xilspi->slave;
+       writel(SPISSR_ACT(cs), &regs->spissr);
 }
 
-void spi_free_slave(struct spi_slave *slave)
+static void spi_cs_deactivate(struct udevice *dev)
 {
-       struct xilinx_spi_slave *xilspi = to_xilinx_spi_slave(slave);
+       struct udevice *bus = dev_get_parent(dev);
+       struct xilinx_spi_priv *priv = dev_get_priv(bus);
+       struct xilinx_spi_regs *regs = priv->regs;
 
-       free(xilspi);
+       writel(SPISSR_OFF, &regs->spissr);
 }
 
-int spi_claim_bus(struct spi_slave *slave)
+static int xilinx_spi_claim_bus(struct udevice *dev)
 {
-       struct xilinx_spi_slave *xilspi = to_xilinx_spi_slave(slave);
-       u32 spicr;
-
-       debug("spi_claim_bus: bus:%i cs:%i\n", slave->bus, slave->cs);
-       writel(SPISSR_OFF, &xilspi->regs->spissr);
+       struct udevice *bus = dev_get_parent(dev);
+       struct xilinx_spi_priv *priv = dev_get_priv(bus);
+       struct xilinx_spi_regs *regs = priv->regs;
 
-       spicr = XILSPI_SPICR_DFLT_ON;
-       if (xilspi->mode & SPI_LSB_FIRST)
-               spicr |= SPICR_LSB_FIRST;
-       if (xilspi->mode & SPI_CPHA)
-               spicr |= SPICR_CPHA;
-       if (xilspi->mode & SPI_CPOL)
-               spicr |= SPICR_CPOL;
-       if (xilspi->mode & SPI_LOOP)
-               spicr |= SPICR_LOOP;
+       writel(SPISSR_OFF, &regs->spissr);
+       writel(XILSPI_SPICR_DFLT_ON, &regs->spicr);
 
-       writel(spicr, &xilspi->regs->spicr);
        return 0;
 }
 
-void spi_release_bus(struct spi_slave *slave)
+static int xilinx_spi_release_bus(struct udevice *dev)
 {
-       struct xilinx_spi_slave *xilspi = to_xilinx_spi_slave(slave);
+       struct udevice *bus = dev_get_parent(dev);
+       struct xilinx_spi_priv *priv = dev_get_priv(bus);
+       struct xilinx_spi_regs *regs = priv->regs;
 
-       debug("spi_release_bus: bus:%i cs:%i\n", slave->bus, slave->cs);
-       writel(SPISSR_OFF, &xilspi->regs->spissr);
-       writel(XILSPI_SPICR_DFLT_OFF, &xilspi->regs->spicr);
+       writel(SPISSR_OFF, &regs->spissr);
+       writel(XILSPI_SPICR_DFLT_OFF, &regs->spicr);
+
+       return 0;
 }
 
-int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
-            void *din, unsigned long flags)
+static int xilinx_spi_xfer(struct udevice *dev, unsigned int bitlen,
+                           const void *dout, void *din, unsigned long flags)
 {
-       struct xilinx_spi_slave *xilspi = to_xilinx_spi_slave(slave);
+       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_platdata *slave_plat = dev_get_parent_platdata(dev);
        /* assume spi core configured to do 8 bit transfers */
        unsigned int bytes = bitlen / XILSPI_MAX_XFER_BITS;
        const unsigned char *txp = dout;
@@ -212,7 +177,7 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
        unsigned global_timeout;
 
        debug("spi_xfer: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n",
-             slave->bus, slave->cs, bitlen, bytes, flags);
+             bus->seq, slave_plat->cs, bitlen, bytes, flags);
 
        if (bitlen == 0)
                goto done;
@@ -225,8 +190,8 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
        }
 
        /* empty read buffer */
-       while (rxecount && !(readl(&xilspi->regs->spisr) & SPISR_RX_EMPTY)) {
-               readl(&xilspi->regs->spidrr);
+       while (rxecount && !(readl(&regs->spisr) & SPISR_RX_EMPTY)) {
+               readl(&regs->spidrr);
                rxecount--;
        }
 
@@ -236,11 +201,11 @@ 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);
 
        /* at least 1usec or greater, leftover 1 */
-       global_timeout = xilspi->freq > XILSPI_MAX_XFER_BITS * 1000000 ? 2 :
-                       (XILSPI_MAX_XFER_BITS * 1000000 / xilspi->freq) + 1;
+       global_timeout = priv->freq > XILSPI_MAX_XFER_BITS * 1000000 ? 2 :
+                       (XILSPI_MAX_XFER_BITS * 1000000 / priv->freq) + 1;
 
        while (bytes--) {
                unsigned timeout = global_timeout;
@@ -249,8 +214,8 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
                debug("spi_xfer: tx:%x ", d);
 
                /* write out and wait for processing (receive data) */
-               writel(d & SPIDTR_8BIT_MASK, &xilspi->regs->spidtr);
-               while (timeout && readl(&xilspi->regs->spisr)
+               writel(d & SPIDTR_8BIT_MASK, &regs->spidtr);
+               while (timeout && readl(&regs->spisr)
                                                & SPISR_RX_EMPTY) {
                        timeout--;
                        udelay(1);
@@ -262,7 +227,7 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
                }
 
                /* read Rx element and push into data in buffer */
-               d = readl(&xilspi->regs->spidrr) & SPIDRR_8BIT_MASK;
+               d = readl(&regs->spidrr) & SPIDRR_8BIT_MASK;
                if (rxp)
                        *rxp++ = d;
                debug("spi_xfer: rx:%x\n", d);
@@ -270,7 +235,66 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
 
  done:
        if (flags & SPI_XFER_END)
-               spi_cs_deactivate(slave);
+               spi_cs_deactivate(dev);
 
        return 0;
 }
+
+static int xilinx_spi_set_speed(struct udevice *bus, uint speed)
+{
+       struct xilinx_spi_priv *priv = dev_get_priv(bus);
+
+       priv->freq = speed;
+
+       debug("xilinx_spi_set_speed: regs=%p, mode=%d\n", priv->regs,
+             priv->freq);
+
+       return 0;
+}
+
+static int xilinx_spi_set_mode(struct udevice *bus, uint mode)
+{
+       struct xilinx_spi_priv *priv = dev_get_priv(bus);
+       struct xilinx_spi_regs *regs = priv->regs;
+       uint32_t spicr;
+
+       spicr = readl(&regs->spicr);
+       if (priv->mode & SPI_LSB_FIRST)
+               spicr |= SPICR_LSB_FIRST;
+       if (priv->mode & SPI_CPHA)
+               spicr |= SPICR_CPHA;
+       if (priv->mode & SPI_CPOL)
+               spicr |= SPICR_CPOL;
+       if (priv->mode & SPI_LOOP)
+               spicr |= SPICR_LOOP;
+
+       writel(spicr, &regs->spicr);
+       priv->mode = mode;
+
+       debug("xilinx_spi_set_mode: regs=%p, mode=%d\n", priv->regs,
+             priv->mode);
+
+       return 0;
+}
+
+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,
+};
+
+static const struct udevice_id xilinx_spi_ids[] = {
+       { .compatible = "xlnx,xilinx-spi" },
+       { }
+};
+
+U_BOOT_DRIVER(xilinx_spi) = {
+       .name   = "xilinx_spi",
+       .id     = UCLASS_SPI,
+       .of_match = xilinx_spi_ids,
+       .ops    = &xilinx_spi_ops,
+       .priv_auto_alloc_size = sizeof(struct xilinx_spi_priv),
+       .probe  = xilinx_spi_probe,
+};