cg2900: firmware download at 115kbps CG2910/05

There is a bug in CG2910/05 PG1, due to which ARMSS firmware patch has
to be downloaded at 115kbps.
CQ Ticket for this hardware bug is CM0033243

ST-Ericsson Linux next: Not Tested, ER 373024
ST-Ericsson ID: 373024
ST-Ericsson FOSS-OUT ID: STETL-FOSS-OUT-10019

Change-Id: I4965618f5a1b0ab40f683a5f720a99790d80c3da
Depends-On: 09e279e3710a122eccd1ebd4929f79c244c78c9e
Signed-off-by: Nitin Dhingra <nitin.dhingra@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/43862
Reviewed-by: QATOOLS

3 files changed, 71 insertions, 4 deletions

diff --git a/drivers/staging/cg2900/bluetooth/cg2900_uart.c b/drivers/staging/cg2900/bluetooth/cg2900_uart.c
index 6b577514ae6..adfc1b26e83 100644
--- a/drivers/staging/cg2900/bluetooth/cg2900_uart.c
+++ b/drivers/staging/cg2900/bluetooth/cg2900_uart.c
@@ -1289,6 +1289,44 @@ static int set_baud_rate(struct hci_uart *hu, int baud)
 }
 
 /**
+ * uart_set_baud_rate() - External Interface for setting baud rate
+ * @dev:		Transport device information.
+ * @low_baud:	whether switch to low_baud or high.
+ *
+ * Returns:
+ *   none
+ */
+static void uart_set_baud_rate(struct cg2900_chip_dev *dev, bool low_baud)
+{
+	struct uart_info *uart_info = dev_get_drvdata(dev->dev);
+
+	if (!uart_info->hu) {
+		dev_err(MAIN_DEV, "uart_set_baud_rate: UART not open\n");
+		return;
+	}
+
+	if (low_baud) {
+		if (uart_info->baud_rate != uart_default_baud) {
+			dev_dbg(MAIN_DEV, "Changing BAUD now to : %d",
+					uart_default_baud);
+			set_baud_rate(uart_info->hu, uart_default_baud);
+		} else {
+			dev_dbg(MAIN_DEV, "BAUD is already set to :%d",
+					uart_default_baud);
+		}
+	} else {
+		if (uart_info->baud_rate != uart_high_baud) {
+			dev_dbg(MAIN_DEV, "Changing BAUD now to : %d",
+					uart_high_baud);
+			set_baud_rate(uart_info->hu, uart_high_baud);
+		} else {
+			dev_dbg(MAIN_DEV, "BAUD is already set to :%d",
+					uart_high_baud);
+		}
+	}
+}
+
+/**
  * uart_write() - Transmit data to CG2900 over UART.
  * @dev:	Transport device information.
  * @skb:	SK buffer to transmit.
@@ -1341,6 +1379,7 @@ static int uart_open(struct cg2900_chip_dev *dev)
 		return -EACCES;
 	}
 
+	uart_info->baud_rate = uart_default_baud;
 	/*
 	 * Chip has just been started up. It has a system to autodetect
 	 * exact baud rate and transport to use. There are only a few commands
@@ -1390,10 +1429,21 @@ static int uart_open(struct cg2900_chip_dev *dev)
 	}
 
 	/* Just return if there will be no change of baud rate */
-	if (uart_default_baud != uart_high_baud)
-		return set_baud_rate(uart_info->hu, uart_high_baud);
-	else
-		return 0;
+	if (uart_default_baud != uart_high_baud) {
+
+		/*
+		 * Don't change to high baud yet
+		 * as there is bug CG2905/10 PG1 that firmware d/l
+		 * has to take place at lower baud
+		 * after firmware d/l UART will be switched
+		 * to higher baud.
+		 */
+		if (CG2905_PG1_1_REV != dev->chip.hci_revision &&
+				CG2910_PG1_REV != dev->chip.hci_revision)
+			return set_baud_rate(uart_info->hu, uart_high_baud);
+	}
+
+	return 0;
 }
 
 /**
@@ -2078,6 +2128,8 @@ static int __devinit cg2900_uart_probe(struct platform_device *pdev)
 	uart_info->chip_dev.t_cb.set_chip_power = uart_set_chip_power;
 	uart_info->chip_dev.t_cb.chip_startup_finished =
 			uart_chip_startup_finished;
+	uart_info->chip_dev.t_cb.set_baud_rate =
+			uart_set_baud_rate;
 	uart_info->chip_dev.pdev = pdev;
 	uart_info->chip_dev.dev = &pdev->dev;
 	uart_info->chip_dev.t_data = uart_info;
diff --git a/drivers/staging/cg2900/include/cg2900.h b/drivers/staging/cg2900/include/cg2900.h
index 85b5e03eb3c..e1c1860765a 100644
--- a/drivers/staging/cg2900/include/cg2900.h
+++ b/drivers/staging/cg2900/include/cg2900.h
@@ -124,6 +124,7 @@ struct cg2900_trans_callbacks {
 	int (*write)(struct cg2900_chip_dev *dev, struct sk_buff *skb);
 	void (*set_chip_power)(struct cg2900_chip_dev *dev, bool chip_on);
 	void (*chip_startup_finished)(struct cg2900_chip_dev *dev);
+	void (*set_baud_rate)(struct cg2900_chip_dev *dev, bool low_baud);
 };
 
 /**
diff --git a/drivers/staging/cg2900/mfd/cg2900_chip.c b/drivers/staging/cg2900/mfd/cg2900_chip.c
index 5e1a337ed03..2ae418c9f03 100644
--- a/drivers/staging/cg2900/mfd/cg2900_chip.c
+++ b/drivers/staging/cg2900/mfd/cg2900_chip.c
@@ -2570,6 +2570,20 @@ static int cg2900_open(struct cg2900_user_data *user)
 			err = -EIO;
 			goto err_free_list_item;
 		}
+
+		if (CG2905_PG1_1_REV == dev->chip.hci_revision ||
+				CG2910_PG1_REV == dev->chip.hci_revision) {
+			/*
+			 * Switch to higher baud rate
+			 * Because of bug in CG2905/CG2910 PG1 H/W,
+			 * We have to download the ptc/ssf files
+			 * at lower baud and then switch to Higher Baud
+			 */
+			if (info->chip_dev->t_cb.set_baud_rate)
+				info->chip_dev->t_cb.set_baud_rate(
+						info->chip_dev, false);
+		}
+
 	}
 
 	list_add_tail(&tmp->list, &info->open_channels);