[ARM] pxa: add base support for Marvell's PXA168 processor line

"""The Marvell® PXA168 processor is the first in a family of application
processors targeted at mass market opportunities in computing and consumer
devices. It balances high computing and multimedia performance with low
power consumption to support extended battery life, and includes a wealth
of integrated peripherals to reduce overall BOM cost .... """

See http://www.marvell.com/featured/pxa168.jsp for more information.

  1. Marvell Mohawk core is a hybrid of xscale3 and its own ARM core,
     there are many enhancements like instructions for flushing the
     whole D-cache, and so on

  2. Clock reuses Russell's common clkdev, and added the basic support
     for UART1/2.

  3. Devices are a bit different from the 'mach-pxa' way, the platform
     devices are now dynamically allocated only when necessary (i.e.
     when pxa_register_device() is called). Description for each device
     are stored in an array of 'struct pxa_device_desc'. Now that:

     a. this array of device description is marked with __initdata and
        can be freed up system is fully up

     b. which means board code has to add all needed devices early in
        his initializing function

     c. platform specific data can now be marked as __initdata since
        they are allocated and copied by platform_device_add_data()

  4. only the basic UART1/2/3 are added, more devices will come later.

Signed-off-by: Jason Chagas <chagas@marvell.com>
Signed-off-by: Eric Miao <eric.miao@marvell.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/arch/arm/mach-mmp/pxa168.c b/arch/arm/mach-mmp/pxa168.c
new file mode 100644
index 000000000000..1935c7545117
--- /dev/null
+++ b/arch/arm/mach-mmp/pxa168.c
@@ -0,0 +1,77 @@
+/*
+ *  linux/arch/arm/mach-mmp/pxa168.c
+ *
+ *  Code specific to PXA168
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/clk.h>
+
+#include <asm/mach/time.h>
+#include <mach/addr-map.h>
+#include <mach/cputype.h>
+#include <mach/regs-apbc.h>
+#include <mach/irqs.h>
+#include <mach/dma.h>
+#include <mach/devices.h>
+
+#include "common.h"
+#include "clock.h"
+
+void __init pxa168_init_irq(void)
+{
+	icu_init_irq();
+}
+
+/* APB peripheral clocks */
+static APBC_CLK(uart1, PXA168_UART1, 1, 14745600);
+static APBC_CLK(uart2, PXA168_UART2, 1, 14745600);
+
+/* device and clock bindings */
+static struct clk_lookup pxa168_clkregs[] = {
+	INIT_CLKREG(&clk_uart1, "pxa2xx-uart.0", NULL),
+	INIT_CLKREG(&clk_uart2, "pxa2xx-uart.1", NULL),
+};
+
+static int __init pxa168_init(void)
+{
+	if (cpu_is_pxa168()) {
+		pxa_init_dma(IRQ_PXA168_DMA_INT0, 32);
+		clks_register(ARRAY_AND_SIZE(pxa168_clkregs));
+	}
+
+	return 0;
+}
+postcore_initcall(pxa168_init);
+
+/* system timer - clock enabled, 3.25MHz */
+#define TIMER_CLK_RST	(APBC_APBCLK | APBC_FNCLK | APBC_FNCLKSEL(3))
+
+static void __init pxa168_timer_init(void)
+{
+	/* this is early, we have to initialize the CCU registers by
+	 * ourselves instead of using clk_* API. Clock rate is defined
+	 * by APBC_TIMERS_CLK_RST (3.25MHz) and enabled free-running
+	 */
+	__raw_writel(APBC_APBCLK | APBC_RST, APBC_PXA168_TIMERS);
+
+	/* 3.25MHz, bus/functional clock enabled, release reset */
+	__raw_writel(TIMER_CLK_RST, APBC_PXA168_TIMERS);
+
+	timer_init(IRQ_PXA168_TIMER1);
+}
+
+struct sys_timer pxa168_timer = {
+	.init	= pxa168_timer_init,
+};
+
+/* on-chip devices */
+PXA168_DEVICE(uart1, "pxa2xx-uart", 0, UART1, 0xd4017000, 0x30, 21, 22);
+PXA168_DEVICE(uart2, "pxa2xx-uart", 1, UART2, 0xd4018000, 0x30, 23, 24);