davinci: serial: generalize for more SoCs

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

2 files changed, 96 insertions, 20 deletions

diff --git a/arch/arm/mach-davinci/include/mach/serial.h b/arch/arm/mach-davinci/include/mach/serial.h
index fb8cb229bfd..632847d74a1 100644
--- a/arch/arm/mach-davinci/include/mach/serial.h
+++ b/arch/arm/mach-davinci/include/mach/serial.h
@@ -13,8 +13,23 @@
 
 #include <mach/io.h>
 
-#define DAVINCI_UART0_BASE   (IO_PHYS + 0x20000)
-#define DAVINCI_UART1_BASE   (IO_PHYS + 0x20400)
-#define DAVINCI_UART2_BASE   (IO_PHYS + 0x20800)
+#define DAVINCI_MAX_NR_UARTS    3
+#define DAVINCI_UART0_BASE      (IO_PHYS + 0x20000)
+#define DAVINCI_UART1_BASE      (IO_PHYS + 0x20400)
+#define DAVINCI_UART2_BASE      (IO_PHYS + 0x20800)
+
+#define DM355_UART2_BASE        (IO_PHYS + 0x206000)
+
+/* DaVinci UART register offsets */
+#define UART_DAVINCI_PWREMU             0x0c
+#define UART_DM646X_SCR                 0x10
+#define UART_DM646X_SCR_TX_WATERMARK    0x08
+
+struct davinci_uart_config {
+        /* Bit field of UARTs present; bit 0 --> UART1 */
+        unsigned int enabled_uarts;
+};
+
+extern void davinci_serial_init(struct davinci_uart_config *);
 
 #endif /* __ASM_ARCH_SERIAL_H */
diff --git a/arch/arm/mach-davinci/serial.c b/arch/arm/mach-davinci/serial.c
index 3010f997125..69507579652 100644
--- a/arch/arm/mach-davinci/serial.c
+++ b/arch/arm/mach-davinci/serial.c
@@ -32,32 +32,47 @@
 #include <mach/hardware.h>
 #include <mach/serial.h>
 #include <mach/irqs.h>
+#include <mach/cputype.h>
+#include "clock.h"
 
-#define UART_DAVINCI_PWREMU 0x0c
-
-static inline unsigned int davinci_serial_in(struct plat_serial8250_port *up,
-                                          int offset)
+static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
+                                           int offset)
 {
         offset <<= up->regshift;
-        return (unsigned int)__raw_readb(up->membase + offset);
+        return (unsigned int)__raw_readl(IO_ADDRESS(up->mapbase) + offset);
 }
 
-static inline void davinci_serial_outp(struct plat_serial8250_port *p,
-                                       int offset, int value)
+static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
+                                    int value)
 {
         offset <<= p->regshift;
-        __raw_writeb(value, p->membase + offset);
+        __raw_writel(value, IO_ADDRESS(p->mapbase) + offset);
 }
 
 static struct plat_serial8250_port serial_platform_data[] = {
         {
-                .membase        = (char *)IO_ADDRESS(DAVINCI_UART0_BASE),
-                .mapbase        = (unsigned long)DAVINCI_UART0_BASE,
+                .mapbase        = DAVINCI_UART0_BASE,
                 .irq            = IRQ_UARTINT0,
-                .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
+                .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
+                                  UPF_IOREMAP,
+                .iotype         = UPIO_MEM,
+                .regshift       = 2,
+        },
+        {
+                .mapbase        = DAVINCI_UART1_BASE,
+                .irq            = IRQ_UARTINT1,
+                .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
+                                  UPF_IOREMAP,
+                .iotype         = UPIO_MEM,
+                .regshift       = 2,
+        },
+        {
+                .mapbase        = DAVINCI_UART2_BASE,
+                .irq            = IRQ_UARTINT2,
+                .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
+                                  UPF_IOREMAP,
                 .iotype         = UPIO_MEM,
                 .regshift       = 2,
-                .uartclk        = 27000000,
         },
         {
                 .flags          = 0
@@ -74,22 +89,68 @@ static struct platform_device serial_device = {
 
 static void __init davinci_serial_reset(struct plat_serial8250_port *p)
 {
-        /* reset both transmitter and receiver: bits 14,13 = UTRST, URRST */
         unsigned int pwremu = 0;
 
-        davinci_serial_outp(p, UART_IER, 0);  /* disable all interrupts */
+        serial_write_reg(p, UART_IER, 0);  /* disable all interrupts */
 
-        davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu);
+        /* reset both transmitter and receiver: bits 14,13 = UTRST, URRST */
+        serial_write_reg(p, UART_DAVINCI_PWREMU, pwremu);
         mdelay(10);
 
         pwremu |= (0x3 << 13);
         pwremu |= 0x1;
-        davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu);
+        serial_write_reg(p, UART_DAVINCI_PWREMU, pwremu);
+
+        if (cpu_is_davinci_dm646x())
+                serial_write_reg(p, UART_DM646X_SCR,
+                                 UART_DM646X_SCR_TX_WATERMARK);
+}
+
+void __init davinci_serial_init(struct davinci_uart_config *info)
+{
+        int i;
+        char name[16];
+        struct clk *uart_clk;
+        struct device *dev = &serial_device.dev;
+
+        /*
+         * Make sure the serial ports are muxed on at this point.
+         * You have to mux them off in device drivers later on
+         * if not needed.
+         */
+        for (i = 0; i < DAVINCI_MAX_NR_UARTS; i++) {
+                struct plat_serial8250_port *p = serial_platform_data + i;
+
+                if (!(info->enabled_uarts & (1 << i))) {
+                        p->flags = 0;
+                        continue;
+                }
+
+                if (cpu_is_davinci_dm646x())
+                        p->iotype = UPIO_MEM32;
+
+                if (cpu_is_davinci_dm355()) {
+                        if (i == 2) {
+                                p->mapbase = (unsigned long)DM355_UART2_BASE;
+                                p->irq = IRQ_DM355_UARTINT2;
+                        }
+                }
+
+                sprintf(name, "uart%d", i);
+                uart_clk = clk_get(dev, name);
+                if (IS_ERR(uart_clk))
+                        printk(KERN_ERR "%s:%d: failed to get UART%d clock\n",
+                                        __func__, __LINE__, i);
+                else {
+                        clk_enable(uart_clk);
+                        p->uartclk = clk_get_rate(uart_clk);
+                        davinci_serial_reset(p);
+                }
+        }
 }
 
 static int __init davinci_init(void)
 {
-        davinci_serial_reset(&serial_platform_data[0]);
         return platform_device_register(&serial_device);
 }