[PATCH 1/4] tty: serial: uartlite: Add structure for private data

[Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>]

Add struct uartlite_data, to store the private data of the Uartlite
driver.

Signed-off-by: Tanvi Desai <tanvi.desai@xilinx.com>
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
---
 drivers/tty/serial/uartlite.c | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index c47db78..060ac12 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -54,6 +54,10 @@
 #define ULITE_CONTROL_RST_RX   0x02
 #define ULITE_CONTROL_IE       0x10

+struct uartlite_data {
+       const struct uartlite_reg_ops *reg_ops;
+};
+
 struct uartlite_reg_ops {
        u32 (*in)(void __iomem *addr);
        void (*out)(u32 val, void __iomem *addr);
@@ -91,16 +95,16 @@ static const struct uartlite_reg_ops uartlite_le = {

 static inline u32 uart_in32(u32 offset, struct uart_port *port)
 {
-       const struct uartlite_reg_ops *reg_ops = port->private_data;
+       struct uartlite_data *pdata = port->private_data;

-       return reg_ops->in(port->membase + offset);
+       return pdata->reg_ops->in(port->membase + offset);
 }

 static inline void uart_out32(u32 val, u32 offset, struct uart_port *port)
 {
-       const struct uartlite_reg_ops *reg_ops = port->private_data;
+       struct uartlite_data *pdata = port->private_data;

-       reg_ops->out(val, port->membase + offset);
+       pdata->reg_ops->out(val, port->membase + offset);
 }

 static struct uart_port ulite_ports[ULITE_NR_UARTS];
@@ -325,6 +329,7 @@ static void ulite_release_port(struct uart_port *port)

 static int ulite_request_port(struct uart_port *port)
 {
+       struct uartlite_data *pdata = port->private_data;
        int ret;

        pr_debug("ulite console: port=%p; port->mapbase=%llx\n",
@@ -342,13 +347,13 @@ static int ulite_request_port(struct uart_port *port)
                return -EBUSY;
        }

-       port->private_data = (void *)&uartlite_be;
+       pdata->reg_ops = &uartlite_be;
        ret = uart_in32(ULITE_CONTROL, port);
        uart_out32(ULITE_CONTROL_RST_TX, ULITE_CONTROL, port);
        ret = uart_in32(ULITE_STATUS, port);
        /* Endianess detection */
        if ((ret & ULITE_STATUS_TXEMPTY) != ULITE_STATUS_TXEMPTY)
-               port->private_data = (void *)&uartlite_le;
+               pdata->reg_ops = &uartlite_le;

        return 0;
 }
@@ -585,10 +590,12 @@ static struct uart_driver ulite_uart_driver = {
  * @id: requested id number.  Pass -1 for automatic port assignment
  * @base: base address of uartlite registers
  * @irq: irq number for uartlite
+ * @pdata: private data for uartlite
  *
  * Returns: 0 on success, <0 otherwise
  */
-static int ulite_assign(struct device *dev, int id, u32 base, int irq)
+static int ulite_assign(struct device *dev, int id, u32 base, int irq,
+               struct uartlite_data *pdata)
 {
        struct uart_port *port;
        int rc;
@@ -625,6 +632,7 @@ static int ulite_assign(struct device *dev, int id, u32 base, int irq)
        port->dev = dev;
        port->type = PORT_UNKNOWN;
        port->line = id;
+       port->private_data = pdata;

        dev_set_drvdata(dev, port);

@@ -675,6 +683,7 @@ MODULE_DEVICE_TABLE(of, ulite_of_match);
 static int ulite_probe(struct platform_device *pdev)
 {
        struct resource *res;
+       struct uartlite_data *pdata;
        int irq;
        int id = pdev->id;
 #ifdef CONFIG_OF
@@ -684,6 +693,10 @@ static int ulite_probe(struct platform_device *pdev)
        if (prop)
                id = be32_to_cpup(prop);
 #endif
+       pdata = devm_kzalloc(&pdev->dev, sizeof(struct uartlite_data),
+                       GFP_KERNEL);
+       if (!pdata)
+               return -ENOMEM;

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res)
@@ -693,7 +706,7 @@ static int ulite_probe(struct platform_device *pdev)
        if (irq <= 0)
                return -ENXIO;

-       return ulite_assign(&pdev->dev, id, res->start, irq);
+       return ulite_assign(&pdev->dev, id, res->start, irq, pdata);
 }

 static int ulite_remove(struct platform_device *pdev)
--
2.7.4

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