[PATCH] ppc32: Make the UARTs on MPC824x individual platform devices

The UARTs on the MPC824x are unique devices and really shouldn't be thought
of as a DUART.  In addition, if both UARTs are in use we need to configure
the part to enable the 2nd UART since the pins for the UARTs are
multiplexed.  Adds support to run the 824x Sandpoint with both UARTs if
desired.

Signed-off-by: Matt McClintock <msm@freescale.com>
Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 61 insertions, 18 deletions

diff --git a/arch/ppc/Kconfig b/arch/ppc/Kconfig
index be4e629e69d0..a862c037c65d 100644
--- a/arch/ppc/Kconfig
+++ b/arch/ppc/Kconfig
@@ -878,6 +878,13 @@ config MPC10X_STORE_GATHERING
         bool "Enable MPC10x store gathering"
         depends on MPC10X_BRIDGE
 
+config SANDPOINT_ENABLE_UART1
+        bool "Enable DUART mode on Sandpoint"
+        depends on SANDPOINT
+        help
+          If this option is enabled then the MPC824x processor will run
+          in DUART mode instead of UART mode.
+
 config CPC710_DATA_GATHERING
         bool "Enable CPC710 data gathering"
         depends on K2
diff --git a/arch/ppc/configs/sandpoint_defconfig b/arch/ppc/configs/sandpoint_defconfig
index 0f4393a07f82..fb493a67c60d 100644
--- a/arch/ppc/configs/sandpoint_defconfig
+++ b/arch/ppc/configs/sandpoint_defconfig
@@ -437,7 +437,7 @@ CONFIG_SOUND_GAMEPORT=y
 #
 CONFIG_SERIAL_8250=y
 CONFIG_SERIAL_8250_CONSOLE=y
-CONFIG_SERIAL_8250_NR_UARTS=2
+CONFIG_SERIAL_8250_NR_UARTS=4
 # CONFIG_SERIAL_8250_EXTENDED is not set
 
 #
diff --git a/arch/ppc/platforms/sandpoint.c b/arch/ppc/platforms/sandpoint.c
index 8b149c2fc54f..21e31346b12b 100644
--- a/arch/ppc/platforms/sandpoint.c
+++ b/arch/ppc/platforms/sandpoint.c
@@ -311,19 +311,22 @@ sandpoint_setup_arch(void)
         {
                 bd_t *bp = (bd_t *)__res;
                 struct plat_serial8250_port *pdata;
-                pdata = (struct plat_serial8250_port *) ppc_sys_get_pdata(MPC10X_DUART);
 
+                pdata = (struct plat_serial8250_port *) ppc_sys_get_pdata(MPC10X_UART0);
                 if (pdata)
                 {
                         pdata[0].uartclk = bp->bi_busfreq;
-                        pdata[0].membase = ioremap(pdata[0].mapbase, 0x100);
+                }
 
-                        /* this disables the 2nd serial port on the DUART
-                         * since the sandpoint does not have it connected */
-                        pdata[1].uartclk = 0;
-                        pdata[1].irq = 0;
-                        pdata[1].mapbase = 0;
+#ifdef CONFIG_SANDPOINT_ENABLE_UART1
+                pdata = (struct plat_serial8250_port *) ppc_sys_get_pdata(MPC10X_UART1);
+                if (pdata)
+                {
+                        pdata[0].uartclk = bp->bi_busfreq;
                 }
+#else
+                ppc_sys_device_remove(MPC10X_UART1);
+#endif
         }
 
         printk(KERN_INFO "Motorola SPS Sandpoint Test Platform\n");
diff --git a/arch/ppc/syslib/mpc10x_common.c b/arch/ppc/syslib/mpc10x_common.c
index 8fc5f4154521..87065e2e4c5f 100644
--- a/arch/ppc/syslib/mpc10x_common.c
+++ b/arch/ppc/syslib/mpc10x_common.c
@@ -45,24 +45,29 @@
 #define MPC10X_DMA0_IRQ (EPIC_IRQ_BASE + 1 + NUM_8259_INTERRUPTS)
 #define MPC10X_DMA1_IRQ (EPIC_IRQ_BASE + 2 + NUM_8259_INTERRUPTS)
 #define MPC10X_UART0_IRQ (EPIC_IRQ_BASE + 4 + NUM_8259_INTERRUPTS)
+#define MPC10X_UART1_IRQ (EPIC_IRQ_BASE + 5 + NUM_8259_INTERRUPTS)
 #else
 #define MPC10X_I2C_IRQ -1
 #define MPC10X_DMA0_IRQ -1
 #define MPC10X_DMA1_IRQ -1
 #define MPC10X_UART0_IRQ -1
+#define MPC10X_UART1_IRQ -1
 #endif
 
 static struct fsl_i2c_platform_data mpc10x_i2c_pdata = {
         .device_flags           = 0,
 };
 
-static struct plat_serial8250_port serial_platform_data[] = {
+static struct plat_serial8250_port serial_plat_uart0[] = {
         [0] = {
                 .mapbase        = 0x4500,
                 .iotype         = UPIO_MEM,
                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
         },
-        [1] = {
+        { },
+};
+static struct plat_serial8250_port serial_plat_uart1[] = {
+        [0] = {
                 .mapbase        = 0x4600,
                 .iotype         = UPIO_MEM,
                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
@@ -133,11 +138,17 @@ struct platform_device ppc_sys_platform_devices[] = {
                         },
                 },
         },
-        [MPC10X_DUART] = {
+        [MPC10X_UART0] = {
                 .name = "serial8250",
                 .id     = 0,
-                .dev.platform_data = serial_platform_data,
+                .dev.platform_data = serial_plat_uart0,
         },
+        [MPC10X_UART1] = {
+                .name = "serial8250",
+                .id     = 1,
+                .dev.platform_data = serial_plat_uart1,
+        },
+
 };
 
 /* We use the PCI ID to match on */
@@ -147,10 +158,10 @@ struct ppc_sys_spec ppc_sys_specs[] = {
                 .ppc_sys_name   = "8245",
                 .mask           = 0xFFFFFFFF,
                 .value          = MPC10X_BRIDGE_8245,
-                .num_devices    = 4,
+                .num_devices    = 5,
                 .device_list    = (enum ppc_sys_devices[])
                 {
-                        MPC10X_IIC1, MPC10X_DMA0, MPC10X_DMA1, MPC10X_DUART,
+                        MPC10X_IIC1, MPC10X_DMA0, MPC10X_DMA1, MPC10X_UART0, MPC10X_UART1,
                 },
         },
         {
@@ -180,6 +191,25 @@ struct ppc_sys_spec ppc_sys_specs[] = {
         },
 };
 
+/*
+ * mach_mpc10x_fixup: This function enables DUART mode if it detects
+ * if it detects two UARTS in the platform device entries.
+ */
+static int __init mach_mpc10x_fixup(struct platform_device *pdev)
+{
+        if (strncmp (pdev->name, "serial8250", 10) == 0 && pdev->id == 1)
+                writeb(readb(serial_plat_uart1[0].membase + 0x11) | 0x1,
+                                serial_plat_uart1[0].membase + 0x11);
+        return 0;
+}
+
+static int __init mach_mpc10x_init(void)
+{
+        ppc_sys_device_fixup = mach_mpc10x_fixup;
+        return 0;
+}
+postcore_initcall(mach_mpc10x_init);
+
 /* Set resources to match bridge memory map */
 void __init
 mpc10x_bridge_set_resources(int map, struct pci_controller *hose)
@@ -219,6 +249,7 @@ mpc10x_bridge_set_resources(int map, struct pci_controller *hose)
                                 ppc_md.progress("mpc10x:exit1", 0x100);
         }
 }
+
 /*
  * Do some initialization and put the EUMB registers at the specified address
  * (also map the EPIC registers into virtual space--OpenPIC_Addr will be set).
@@ -411,11 +442,13 @@ mpc10x_bridge_init(struct pci_controller *hose,
         ppc_sys_platform_devices[MPC10X_DMA1].resource[1].start = MPC10X_DMA1_IRQ;
         ppc_sys_platform_devices[MPC10X_DMA1].resource[1].end = MPC10X_DMA1_IRQ;
 
-        serial_platform_data[0].mapbase += phys_eumb_base;
-        serial_platform_data[0].irq = MPC10X_UART0_IRQ;
+        serial_plat_uart0[0].mapbase += phys_eumb_base;
+        serial_plat_uart0[0].irq = MPC10X_UART0_IRQ;
+        serial_plat_uart0[0].membase = ioremap(serial_plat_uart0[0].mapbase, 0x100);
 
-        serial_platform_data[1].mapbase += phys_eumb_base;
-        serial_platform_data[1].irq = MPC10X_UART0_IRQ + 1;
+        serial_plat_uart1[0].mapbase += phys_eumb_base;
+        serial_plat_uart1[0].irq = MPC10X_UART1_IRQ;
+        serial_plat_uart1[0].membase = ioremap(serial_plat_uart1[0].mapbase, 0x100);
 
         /*
          * 8240 erratum 26, 8241/8245 erratum 29, 107 erratum 23: speculative