sandbox: Add a warm and cold reset driver

[karo-tx-uboot.git] / drivers / misc / cros_ec_spi.c

diff --git a/drivers/misc/cros_ec_spi.c b/drivers/misc/cros_ec_spi.c
index e403664bb561755184c60e9020e028b84169d40f..0686925aaf1392d74ddd5d529f77d1ef24e0f8e5 100644 (file)
--- a/drivers/misc/cros_ec_spi.c
+++ b/drivers/misc/cros_ec_spi.c
@@ -21,15 +21,12 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#ifdef CONFIG_DM_CROS_EC
 int cros_ec_spi_packet(struct udevice *udev, int out_bytes, int in_bytes)
 {
-       struct cros_ec_dev *dev = udev->uclass_priv;
-#else
-int cros_ec_spi_packet(struct cros_ec_dev *dev, int out_bytes, int in_bytes)
-{
-#endif
+       struct cros_ec_dev *dev = dev_get_uclass_priv(udev);
        struct spi_slave *slave = dev_get_parentdata(dev->dev);
+       ulong start;
+       uint8_t byte;
        int rv;
 
        /* Do the transfer */
@@ -38,10 +35,25 @@ int cros_ec_spi_packet(struct cros_ec_dev *dev, int out_bytes, int in_bytes)
                return -1;
        }
 
-       rv = spi_xfer(slave, max(out_bytes, in_bytes) * 8,
-                     dev->dout, dev->din,
-                     SPI_XFER_BEGIN | SPI_XFER_END);
+       rv = spi_xfer(slave, out_bytes * 8, dev->dout, NULL, SPI_XFER_BEGIN);
+       if (rv)
+               goto done;
+       start = get_timer(0);
+       while (1) {
+               rv = spi_xfer(slave, 8, NULL, &byte, 0);
+               if (byte == SPI_PREAMBLE_END_BYTE)
+                       break;
+               if (rv)
+                       goto done;
+               if (get_timer(start) > 100) {
+                       rv = -ETIMEDOUT;
+                       goto done;
+               }
+       }
 
+       rv = spi_xfer(slave, in_bytes * 8, NULL, dev->din, 0);
+done:
+       spi_xfer(slave, 0, NULL, NULL, SPI_XFER_END);
        spi_release_bus(slave);
 
        if (rv) {
@@ -67,18 +79,11 @@ int cros_ec_spi_packet(struct cros_ec_dev *dev, int out_bytes, int in_bytes)
  * @param din_len      Maximum size of response in bytes
  * @return number of bytes in response, or -1 on error
  */
-#ifdef CONFIG_DM_CROS_EC
 int cros_ec_spi_command(struct udevice *udev, uint8_t cmd, int cmd_version,
                     const uint8_t *dout, int dout_len,
                     uint8_t **dinp, int din_len)
 {
-       struct cros_ec_dev *dev = udev->uclass_priv;
-#else
-int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
-                    const uint8_t *dout, int dout_len,
-                    uint8_t **dinp, int din_len)
-{
-#endif
+       struct cros_ec_dev *dev = dev_get_uclass_priv(udev);
        struct spi_slave *slave = dev_get_parentdata(dev->dev);
        int in_bytes = din_len + 4;     /* status, length, checksum, trailer */
        uint8_t *out;
@@ -143,7 +148,7 @@ int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
                return -1;
        }
 
-       len = min(p[1], din_len);
+       len = min((int)p[1], din_len);
        cros_ec_dump_data("in", -1, p, len + 3);
 
        /* Response code is first byte of message */
@@ -166,79 +171,25 @@ int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
        return len;
 }
 
-#ifndef CONFIG_DM_CROS_EC
-int cros_ec_spi_decode_fdt(struct cros_ec_dev *dev, const void *blob)
+static int cros_ec_probe(struct udevice *dev)
 {
-       /* Decode interface-specific FDT params */
-       dev->max_frequency = fdtdec_get_int(blob, dev->node,
-                                           "spi-max-frequency", 500000);
-       dev->cs = fdtdec_get_int(blob, dev->node, "reg", 0);
-
-       return 0;
-}
-
-/**
- * Initialize SPI protocol.
- *
- * @param dev          CROS_EC device
- * @param blob         Device tree blob
- * @return 0 if ok, -1 on error
- */
-int cros_ec_spi_init(struct cros_ec_dev *dev, const void *blob)
-{
-       int ret;
-
-       ret = spi_setup_slave_fdt(blob, dev->node, dev->parent_node,
-                                 &slave);
-       if (ret) {
-               debug("%s: Could not setup SPI slave\n", __func__);
-               return ret;
-       }
-
-       return 0;
-}
-#endif
-
-#ifdef CONFIG_DM_CROS_EC
-int cros_ec_probe(struct udevice *dev)
-{
-       struct spi_slave *slave = dev_get_parentdata(dev);
-       int ret;
-
-       /*
-        * TODO(sjg@chromium.org)
-        *
-        * This is really horrible at present. It is an artifact of removing
-        * the child_pre_probe() method for SPI. Everything here could go in
-        * an automatic function, except that spi_get_bus_and_cs() wants to
-        * set it up manually and call device_probe_child().
-        *
-        * The solution may be to re-enable the child_pre_probe() method for
-        * SPI and have it do nothing if the child is already passed in via
-        * device_probe_child().
-        */
-       slave->dev = dev;
-       ret = spi_ofdata_to_platdata(gd->fdt_blob, dev->of_offset, slave);
-       if (ret)
-               return ret;
        return cros_ec_register(dev);
 }
 
-struct dm_cros_ec_ops cros_ec_ops = {
+static struct dm_cros_ec_ops cros_ec_ops = {
        .packet = cros_ec_spi_packet,
        .command = cros_ec_spi_command,
 };
 
 static const struct udevice_id cros_ec_ids[] = {
-       { .compatible = "google,cros-ec" },
+       { .compatible = "google,cros-ec-spi" },
        { }
 };
 
 U_BOOT_DRIVER(cros_ec_spi) = {
-       .name           = "cros_ec",
+       .name           = "cros_ec_spi",
        .id             = UCLASS_CROS_EC,
        .of_match       = cros_ec_ids,
        .probe          = cros_ec_probe,
        .ops            = &cros_ec_ops,
 };
-#endif