[PARISC] [MUX] Claim resources for the Mux driver

This patch claims the iomem resources
for the Mux driver.

Signed-off-by: Ryan Bradetich <rbrad@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

1 files changed, 60 insertions, 1 deletions

diff --git a/drivers/serial/mux.c b/drivers/serial/mux.c
index 6408b9b1561a..f21faf163955 100644
--- a/drivers/serial/mux.c
+++ b/drivers/serial/mux.c
@@ -66,6 +66,13 @@ static struct uart_driver mux_driver = {
         .nr = MUX_NR,
 };
 
+struct mux_card {
+        int port_count;
+        struct parisc_device *dev;
+        struct mux_card *next;
+};
+
+static struct mux_card *mux_card_head;
 static struct timer_list mux_timer;
 
 #define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + IO_DATA_REG_OFFSET)
@@ -434,6 +441,37 @@ static struct uart_ops mux_pops = {
 };
 
 /**
+ * get_new_mux_card - Allocate and return a new mux card.
+ *
+ * This function is used to allocate and return a new mux card.
+ */
+static struct mux_card * __init get_new_mux_card(void)
+{
+        struct mux_card *card = mux_card_head;
+
+        if(card == NULL) {
+                mux_card_head = kzalloc(sizeof(struct mux_card), GFP_KERNEL);
+                if(!mux_card_head) {
+                        printk(KERN_ERR "MUX: Unable to allocate memory.\n");
+                        return NULL;
+                }
+                return mux_card_head;
+        }
+
+        while(card->next) {
+                card = card->next;
+        }
+
+        card->next = kzalloc(sizeof(struct mux_card), GFP_KERNEL);
+        if(!card->next) {
+                printk(KERN_ERR "MUX: Unable to allocate memory.\n");
+                return NULL;
+        }
+
+        return card->next;
+}
+
+/**
  * mux_probe - Determine if the Serial Mux should claim this device.
  * @dev: The parisc device.
  *
@@ -446,6 +484,7 @@ static int __init mux_probe(struct parisc_device *dev)
         u8 iodc_data[32];
         unsigned long bytecnt;
         struct uart_port *port;
+        struct mux_card *card;
 
         status = pdc_iodc_read(&bytecnt, dev->hpa.start, 0, iodc_data, 32);
         if(status != PDC_OK) {
@@ -454,7 +493,16 @@ static int __init mux_probe(struct parisc_device *dev)
         }
 
         ports = GET_MUX_PORTS(iodc_data);
-        printk(KERN_INFO "Serial mux driver (%d ports) Revision: 0.3\n", ports);
+        printk(KERN_INFO "Serial mux driver (%d ports) Revision: 0.4\n", ports);
+
+        card = get_new_mux_card();
+        if(card == NULL)
+                return 1;
+
+        card->dev = dev;
+        card->port_count = ports;
+        request_mem_region(card->dev->hpa.start + MUX_OFFSET,
+                card->port_count * MUX_LINE_OFFSET, "Mux");
 
         if(!port_cnt) {
                 mux_driver.cons = MUX_CONSOLE;
@@ -534,6 +582,8 @@ static int __init mux_init(void)
 static void __exit mux_exit(void)
 {
         int i;
+        struct mux_card *next;
+        struct mux_card *card = mux_card_head;
 
         for (i = 0; i < port_cnt; i++) {
                 uart_remove_one_port(&mux_driver, &mux_ports[i].port);
@@ -541,6 +591,15 @@ static void __exit mux_exit(void)
                         iounmap(mux_ports[i].port.membase);
         }
 
+        while(card != NULL) {
+                release_mem_region(card->dev->hpa.start + MUX_OFFSET,
+                                   card->port_count * MUX_LINE_OFFSET);
+
+                next = card->next;
+                kfree(card);
+                card = next;
+        }
+
         uart_unregister_driver(&mux_driver);
 }