linux-sg2042/arch/arm/mach-spear6xx/spear6xx.c

/*
 * arch/arm/mach-spear6xx/spear6xx.c
 *
 * SPEAr6XX machines common source file
 *
 * Copyright (C) 2009 ST Microelectronics
 * Rajeev Kumar<rajeev-dlh.kumar@st.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/types.h>
#include <linux/amba/pl061.h>
#include <linux/ptrace.h>
#include <linux/io.h>
#include <asm/hardware/vic.h>
#include <asm/irq.h>
#include <asm/mach/arch.h>
#include <mach/generic.h>
#include <mach/hardware.h>
#include <mach/irqs.h>

/* Add spear6xx machines common devices here */
/* uart device registration */
struct amba_device uart_device[] = {
	{
		.dev = {
			.init_name = "uart0",
		},
		.res = {
			.start = SPEAR6XX_ICM1_UART0_BASE,
			.end = SPEAR6XX_ICM1_UART0_BASE + SZ_4K - 1,
			.flags = IORESOURCE_MEM,
		},
		.irq = {IRQ_UART_0, NO_IRQ},
	}, {
		.dev = {
			.init_name = "uart1",
		},
		.res = {
			.start = SPEAR6XX_ICM1_UART1_BASE,
			.end = SPEAR6XX_ICM1_UART1_BASE + SZ_4K - 1,
			.flags = IORESOURCE_MEM,
		},
		.irq = {IRQ_UART_1, NO_IRQ},
	}
};

/* gpio device registration */
static struct pl061_platform_data gpio_plat_data[] = {
	{
		.gpio_base	= 0,
		.irq_base	= SPEAR_GPIO0_INT_BASE,
	}, {
		.gpio_base	= 8,
		.irq_base	= SPEAR_GPIO1_INT_BASE,
	}, {
		.gpio_base	= 16,
		.irq_base	= SPEAR_GPIO2_INT_BASE,
	},
};

struct amba_device gpio_device[] = {
	{
		.dev = {
			.init_name = "gpio0",
			.platform_data = &gpio_plat_data[0],
		},
		.res = {
			.start = SPEAR6XX_CPU_GPIO_BASE,
			.end = SPEAR6XX_CPU_GPIO_BASE + SZ_4K - 1,
			.flags = IORESOURCE_MEM,
		},
		.irq = {IRQ_LOCAL_GPIO, NO_IRQ},
	}, {
		.dev = {
			.init_name = "gpio1",
			.platform_data = &gpio_plat_data[1],
		},
		.res = {
			.start = SPEAR6XX_ICM3_GPIO_BASE,
			.end = SPEAR6XX_ICM3_GPIO_BASE + SZ_4K - 1,
			.flags = IORESOURCE_MEM,
		},
		.irq = {IRQ_BASIC_GPIO, NO_IRQ},
	}, {
		.dev = {
			.init_name = "gpio2",
			.platform_data = &gpio_plat_data[2],
		},
		.res = {
			.start = SPEAR6XX_ICM2_GPIO_BASE,
			.end = SPEAR6XX_ICM2_GPIO_BASE + SZ_4K - 1,
			.flags = IORESOURCE_MEM,
		},
		.irq = {IRQ_APPL_GPIO, NO_IRQ},
	}
};

/* This will add devices, and do machine specific tasks */
void __init spear6xx_init(void)
{
	/* nothing to do for now */
}

/* This will initialize vic */
void __init spear6xx_init_irq(void)
{
	vic_init((void __iomem *)VA_SPEAR6XX_CPU_VIC_PRI_BASE, 0, ~0, 0);
	vic_init((void __iomem *)VA_SPEAR6XX_CPU_VIC_SEC_BASE, 32, ~0, 0);
}

/* Following will create static virtual/physical mappings */
static struct map_desc spear6xx_io_desc[] __initdata = {
	{
		.virtual	= VA_SPEAR6XX_ICM1_UART0_BASE,
		.pfn		= __phys_to_pfn(SPEAR6XX_ICM1_UART0_BASE),
		.length		= SZ_4K,
		.type		= MT_DEVICE
	}, {
		.virtual	= VA_SPEAR6XX_CPU_VIC_PRI_BASE,
		.pfn		= __phys_to_pfn(SPEAR6XX_CPU_VIC_PRI_BASE),
		.length		= SZ_4K,
		.type		= MT_DEVICE
	}, {
		.virtual	= VA_SPEAR6XX_CPU_VIC_SEC_BASE,
		.pfn		= __phys_to_pfn(SPEAR6XX_CPU_VIC_SEC_BASE),
		.length		= SZ_4K,
		.type		= MT_DEVICE
	}, {
		.virtual	= VA_SPEAR6XX_ICM3_SYS_CTRL_BASE,
		.pfn		= __phys_to_pfn(SPEAR6XX_ICM3_SYS_CTRL_BASE),
		.length		= SZ_4K,
		.type		= MT_DEVICE
	}, {
		.virtual	= VA_SPEAR6XX_ICM3_MISC_REG_BASE,
		.pfn		= __phys_to_pfn(SPEAR6XX_ICM3_MISC_REG_BASE),
		.length		= SZ_4K,
		.type		= MT_DEVICE
	},
};

/* This will create static memory mapping for selected devices */
void __init spear6xx_map_io(void)
{
	iotable_init(spear6xx_io_desc, ARRAY_SIZE(spear6xx_io_desc));

	/* This will initialize clock framework */
	spear6xx_clk_init();
}

static void __init spear6xx_timer_init(void)
{
	char pclk_name[] = "pll3_48m_clk";
	struct clk *gpt_clk, *pclk;

	/* get the system timer clock */
	gpt_clk = clk_get_sys("gpt0", NULL);
	if (IS_ERR(gpt_clk)) {
		pr_err("%s:couldn't get clk for gpt\n", __func__);
		BUG();
	}

	/* get the suitable parent clock for timer*/
	pclk = clk_get(NULL, pclk_name);
	if (IS_ERR(pclk)) {
		pr_err("%s:couldn't get %s as parent for gpt\n",
				__func__, pclk_name);
		BUG();
	}

	clk_set_parent(gpt_clk, pclk);
	clk_put(gpt_clk);
	clk_put(pclk);

	spear_setup_timer();
}

struct sys_timer spear6xx_timer = {
	.init = spear6xx_timer_init,
};