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authorKevin Hilman <khilman@deeprootsystems.com>2009-04-14 08:04:26 -0500
committerKevin Hilman <khilman@deeprootsystems.com>2009-04-27 09:49:45 -0700
commit617b925f94e0126841164ffd40dd3a8879502b57 (patch)
treefd078ef27fb9c97aa4d572f02f78b9832471d1e2 /arch/arm
parentf9337405b21bafb1c1a24316b3e43b3d3d697925 (diff)
downloadop-kernel-dev-617b925f94e0126841164ffd40dd3a8879502b57.zip
op-kernel-dev-617b925f94e0126841164ffd40dd3a8879502b57.tar.gz
davinci: serial: generalize for more SoCs
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-davinci/include/mach/serial.h21
-rw-r--r--arch/arm/mach-davinci/serial.c95
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 fb8cb22..632847d 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 3010f99..6950757 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);
}
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