[ARM] 5473/1: U300 core machine support

This adds core support for the ST-Ericsson U300 series
platforms: U300, U330, U335 and U365. Supports memory
mappings, interrupt controller, system timer (clocksource
and clockevents), and binds to the existing drivers for
the PrimeCells used in this design: PL190 (VIC), PL180
(MMC/SD host) and PL011 (UART). This is intented to serve
as starting point for our mainling work, more patches to
follow.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 649 insertions, 0 deletions

diff --git a/arch/arm/mach-u300/core.c b/arch/arm/mach-u300/core.c
new file mode 100644
index 00000000000..1f2ed21a0ab
--- /dev/null
+++ b/arch/arm/mach-u300/core.c
@@ -0,0 +1,649 @@
+/*
+ *
+ * arch/arm/mach-u300/core.c
+ *
+ *
+ * Copyright (C) 2007-2009 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * Core platform support, IRQ handling and device definitions.
+ * Author: Linus Walleij <linus.walleij@stericsson.com>
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/mm.h>
+#include <linux/termios.h>
+#include <linux/amba/bus.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+
+#include <asm/types.h>
+#include <asm/setup.h>
+#include <asm/memory.h>
+#include <asm/hardware/vic.h>
+#include <asm/mach/map.h>
+#include <asm/mach/irq.h>
+
+#include <mach/hardware.h>
+#include <mach/syscon.h>
+
+#include "clock.h"
+#include "mmc.h"
+
+/*
+ * Static I/O mappings that are needed for booting the U300 platforms. The
+ * only things we need are the areas where we find the timer, syscon and
+ * intcon, since the remaining device drivers will map their own memory
+ * physical to virtual as the need arise.
+ */
+static struct map_desc u300_io_desc[] __initdata = {
+	{
+		.virtual	= U300_SLOW_PER_VIRT_BASE,
+		.pfn		= __phys_to_pfn(U300_SLOW_PER_PHYS_BASE),
+		.length		= SZ_64K,
+		.type		= MT_DEVICE,
+	},
+	{
+		.virtual	= U300_AHB_PER_VIRT_BASE,
+		.pfn		= __phys_to_pfn(U300_AHB_PER_PHYS_BASE),
+		.length		= SZ_32K,
+		.type		= MT_DEVICE,
+	},
+	{
+		.virtual	= U300_FAST_PER_VIRT_BASE,
+		.pfn		= __phys_to_pfn(U300_FAST_PER_PHYS_BASE),
+		.length		= SZ_32K,
+		.type		= MT_DEVICE,
+	},
+	{
+		.virtual	= 0xffff2000, /* TCM memory */
+		.pfn		= __phys_to_pfn(0xffff2000),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	},
+
+	/*
+	 * This overlaps with the IRQ vectors etc at 0xffff0000, so these
+	 * may have to be moved to 0x00000000 in order to use the ROM.
+	 */
+	/*
+	{
+		.virtual	= U300_BOOTROM_VIRT_BASE,
+		.pfn		= __phys_to_pfn(U300_BOOTROM_PHYS_BASE),
+		.length		= SZ_64K,
+		.type		= MT_ROM,
+	},
+	*/
+};
+
+void __init u300_map_io(void)
+{
+	iotable_init(u300_io_desc, ARRAY_SIZE(u300_io_desc));
+}
+
+/*
+ * Declaration of devices found on the U300 board and
+ * their respective memory locations.
+ */
+static struct amba_device uart0_device = {
+	.dev = {
+		.init_name = "uart0", /* Slow device at 0x3000 offset */
+		.platform_data = NULL,
+	},
+	.res = {
+		.start = U300_UART0_BASE,
+		.end   = U300_UART0_BASE + SZ_4K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	.irq = { IRQ_U300_UART0, NO_IRQ },
+};
+
+/* The U335 have an additional UART1 on the APP CPU */
+#ifdef CONFIG_MACH_U300_BS335
+static struct amba_device uart1_device = {
+	.dev = {
+		.init_name = "uart1", /* Fast device at 0x7000 offset */
+		.platform_data = NULL,
+	},
+	.res = {
+		.start = U300_UART1_BASE,
+		.end   = U300_UART1_BASE + SZ_4K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	.irq = { IRQ_U300_UART1, NO_IRQ },
+};
+#endif
+
+static struct amba_device pl172_device = {
+	.dev = {
+		.init_name = "pl172", /* AHB device at 0x4000 offset */
+		.platform_data = NULL,
+	},
+	.res = {
+		.start = U300_EMIF_CFG_BASE,
+		.end   = U300_EMIF_CFG_BASE + SZ_4K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+};
+
+
+/*
+ * Everything within this next ifdef deals with external devices connected to
+ * the APP SPI bus.
+ */
+static struct amba_device pl022_device = {
+	.dev = {
+		.coherent_dma_mask = ~0,
+		.init_name = "pl022", /* Fast device at 0x6000 offset */
+	},
+	.res = {
+		.start = U300_SPI_BASE,
+		.end   = U300_SPI_BASE + SZ_4K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	.irq = {IRQ_U300_SPI, NO_IRQ },
+	/*
+	 * This device has a DMA channel but the Linux driver does not use
+	 * it currently.
+	 */
+};
+
+static struct amba_device mmcsd_device = {
+	.dev = {
+		.init_name = "mmci", /* Fast device at 0x1000 offset */
+		.platform_data = NULL, /* Added later */
+	},
+	.res = {
+		.start = U300_MMCSD_BASE,
+		.end   = U300_MMCSD_BASE + SZ_4K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	.irq = {IRQ_U300_MMCSD_MCIINTR0, IRQ_U300_MMCSD_MCIINTR1 },
+	/*
+	 * This device has a DMA channel but the Linux driver does not use
+	 * it currently.
+	 */
+};
+
+/*
+ * The order of device declaration may be important, since some devices
+ * have dependencies on other devices being initialized first.
+ */
+static struct amba_device *amba_devs[] __initdata = {
+	&uart0_device,
+#ifdef CONFIG_MACH_U300_BS335
+	&uart1_device,
+#endif
+	&pl022_device,
+	&pl172_device,
+	&mmcsd_device,
+};
+
+/* Here follows a list of all hw resources that the platform devices
+ * allocate. Note, clock dependencies are not included
+ */
+
+static struct resource gpio_resources[] = {
+	{
+		.start = U300_GPIO_BASE,
+		.end   = (U300_GPIO_BASE + SZ_4K - 1),
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.name  = "gpio0",
+		.start = IRQ_U300_GPIO_PORT0,
+		.end   = IRQ_U300_GPIO_PORT0,
+		.flags = IORESOURCE_IRQ,
+	},
+	{
+		.name  = "gpio1",
+		.start = IRQ_U300_GPIO_PORT1,
+		.end   = IRQ_U300_GPIO_PORT1,
+		.flags = IORESOURCE_IRQ,
+	},
+	{
+		.name  = "gpio2",
+		.start = IRQ_U300_GPIO_PORT2,
+		.end   = IRQ_U300_GPIO_PORT2,
+		.flags = IORESOURCE_IRQ,
+	},
+#ifdef U300_COH901571_3
+	{
+		.name  = "gpio3",
+		.start = IRQ_U300_GPIO_PORT3,
+		.end   = IRQ_U300_GPIO_PORT3,
+		.flags = IORESOURCE_IRQ,
+	},
+	{
+		.name  = "gpio4",
+		.start = IRQ_U300_GPIO_PORT4,
+		.end   = IRQ_U300_GPIO_PORT4,
+		.flags = IORESOURCE_IRQ,
+	},
+#ifdef CONFIG_MACH_U300_BS335
+	{
+		.name  = "gpio5",
+		.start = IRQ_U300_GPIO_PORT5,
+		.end   = IRQ_U300_GPIO_PORT5,
+		.flags = IORESOURCE_IRQ,
+	},
+	{
+		.name  = "gpio6",
+		.start = IRQ_U300_GPIO_PORT6,
+		.end   = IRQ_U300_GPIO_PORT6,
+		.flags = IORESOURCE_IRQ,
+	},
+#endif /* CONFIG_MACH_U300_BS335 */
+#endif /* U300_COH901571_3 */
+};
+
+static struct resource keypad_resources[] = {
+	{
+		.start = U300_KEYPAD_BASE,
+		.end   = U300_KEYPAD_BASE + SZ_4K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.name  = "coh901461-press",
+		.start = IRQ_U300_KEYPAD_KEYBF,
+		.end   = IRQ_U300_KEYPAD_KEYBF,
+		.flags = IORESOURCE_IRQ,
+	},
+	{
+		.name  = "coh901461-release",
+		.start = IRQ_U300_KEYPAD_KEYBR,
+		.end   = IRQ_U300_KEYPAD_KEYBR,
+		.flags = IORESOURCE_IRQ,
+	},
+};
+
+static struct resource rtc_resources[] = {
+	{
+		.start = U300_RTC_BASE,
+		.end   = U300_RTC_BASE + SZ_4K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.start = IRQ_U300_RTC,
+		.end   = IRQ_U300_RTC,
+		.flags = IORESOURCE_IRQ,
+	},
+};
+
+/*
+ * Fsmc does have IRQs: #43 and #44 (NFIF and NFIF2)
+ * but these are not yet used by the driver.
+ */
+static struct resource fsmc_resources[] = {
+	{
+		.start = U300_NAND_IF_PHYS_BASE,
+		.end   = U300_NAND_IF_PHYS_BASE + SZ_4K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+};
+
+static struct resource i2c0_resources[] = {
+	{
+		.start = U300_I2C0_BASE,
+		.end   = U300_I2C0_BASE + SZ_4K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.start = IRQ_U300_I2C0,
+		.end   = IRQ_U300_I2C0,
+		.flags = IORESOURCE_IRQ,
+	},
+};
+
+static struct resource i2c1_resources[] = {
+	{
+		.start = U300_I2C1_BASE,
+		.end   = U300_I2C1_BASE + SZ_4K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.start = IRQ_U300_I2C1,
+		.end   = IRQ_U300_I2C1,
+		.flags = IORESOURCE_IRQ,
+	},
+
+};
+
+static struct resource wdog_resources[] = {
+	{
+		.start = U300_WDOG_BASE,
+		.end   = U300_WDOG_BASE + SZ_4K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.start = IRQ_U300_WDOG,
+		.end   = IRQ_U300_WDOG,
+		.flags = IORESOURCE_IRQ,
+	}
+};
+
+/* TODO: These should be protected by suitable #ifdef's */
+static struct resource ave_resources[] = {
+	{
+		.name  = "AVE3e I/O Area",
+		.start = U300_VIDEOENC_BASE,
+		.end   = U300_VIDEOENC_BASE + SZ_512K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.name  = "AVE3e IRQ0",
+		.start = IRQ_U300_VIDEO_ENC_0,
+		.end   = IRQ_U300_VIDEO_ENC_0,
+		.flags = IORESOURCE_IRQ,
+	},
+	{
+		.name  = "AVE3e IRQ1",
+		.start = IRQ_U300_VIDEO_ENC_1,
+		.end   = IRQ_U300_VIDEO_ENC_1,
+		.flags = IORESOURCE_IRQ,
+	},
+	{
+		.name  = "AVE3e Physmem Area",
+		.start = 0, /* 0 will be remapped to reserved memory */
+		.end   = SZ_1M - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	/*
+	 * The AVE3e requires two regions of 256MB that it considers
+	 * "invisible". The hardware will not be able to access these
+	 * adresses, so they should never point to system RAM.
+	 */
+	{
+		.name  = "AVE3e Reserved 0",
+		.start = 0xd0000000,
+		.end   = 0xd0000000 + SZ_256M - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.name  = "AVE3e Reserved 1",
+		.start = 0xe0000000,
+		.end   = 0xe0000000 + SZ_256M - 1,
+		.flags = IORESOURCE_MEM,
+	},
+};
+
+static struct platform_device wdog_device = {
+	.name = "wdog",
+	.id = -1,
+	.num_resources = ARRAY_SIZE(wdog_resources),
+	.resource = wdog_resources,
+};
+
+static struct platform_device i2c0_device = {
+	.name = "stddci2c",
+	.id = 0,
+	.num_resources = ARRAY_SIZE(i2c0_resources),
+	.resource = i2c0_resources,
+};
+
+static struct platform_device i2c1_device = {
+	.name = "stddci2c",
+	.id = 1,
+	.num_resources = ARRAY_SIZE(i2c1_resources),
+	.resource = i2c1_resources,
+};
+
+static struct platform_device gpio_device = {
+	.name = "u300-gpio",
+	.id = -1,
+	.num_resources = ARRAY_SIZE(gpio_resources),
+	.resource = gpio_resources,
+};
+
+static struct platform_device keypad_device = {
+	.name = "keypad",
+	.id = -1,
+	.num_resources = ARRAY_SIZE(keypad_resources),
+	.resource = keypad_resources,
+};
+
+static struct platform_device rtc_device = {
+	.name = "rtc0",
+	.id = -1,
+	.num_resources = ARRAY_SIZE(rtc_resources),
+	.resource = rtc_resources,
+};
+
+static struct platform_device fsmc_device = {
+	.name = "nandif",
+	.id = -1,
+	.num_resources = ARRAY_SIZE(fsmc_resources),
+	.resource = fsmc_resources,
+};
+
+static struct platform_device ave_device = {
+	.name = "video_enc",
+	.id = -1,
+	.num_resources = ARRAY_SIZE(ave_resources),
+	.resource = ave_resources,
+};
+
+/*
+ * Notice that AMBA devices are initialized before platform devices.
+ *
+ */
+static struct platform_device *platform_devs[] __initdata = {
+	&i2c0_device,
+	&i2c1_device,
+	&keypad_device,
+	&rtc_device,
+	&gpio_device,
+	&fsmc_device,
+	&wdog_device,
+	&ave_device
+};
+
+
+/*
+ * Interrupts: the U300 platforms have two pl190 ARM PrimeCells connected
+ * together so some interrupts are connected to the first one and some
+ * to the second one.
+ */
+void __init u300_init_irq(void)
+{
+	u32 mask[2] = {0, 0};
+	int i;
+
+	for (i = 0; i < NR_IRQS; i++)
+		set_bit(i, (unsigned long *) &mask[0]);
+	u300_enable_intcon_clock();
+	vic_init((void __iomem *) U300_INTCON0_VBASE, 0, mask[0]);
+	vic_init((void __iomem *) U300_INTCON1_VBASE, 32, mask[1]);
+}
+
+
+/*
+ * U300 platforms peripheral handling
+ */
+struct db_chip {
+	u16 chipid;
+	const char *name;
+};
+
+/*
+ * This is a list of the Digital Baseband chips used in the U300 platform.
+ */
+static struct db_chip db_chips[] __initdata = {
+	{
+		.chipid = 0xb800,
+		.name = "DB3000",
+	},
+	{
+		.chipid = 0xc000,
+		.name = "DB3100",
+	},
+	{
+		.chipid = 0xc800,
+		.name = "DB3150",
+	},
+	{
+		.chipid = 0xd800,
+		.name = "DB3200",
+	},
+	{
+		.chipid = 0xe000,
+		.name = "DB3250",
+	},
+	{
+		.chipid = 0xe800,
+		.name = "DB3210",
+	},
+	{
+		.chipid = 0xf000,
+		.name = "DB3350 P1x",
+	},
+	{
+		.chipid = 0xf100,
+		.name = "DB3350 P2x",
+	},
+	{
+		.chipid = 0x0000, /* List terminator */
+		.name = NULL,
+	}
+};
+
+static void u300_init_check_chip(void)
+{
+
+	u16 val;
+	struct db_chip *chip;
+	const char *chipname;
+	const char unknown[] = "UNKNOWN";
+
+	/* Read out and print chip ID */
+	val = readw(U300_SYSCON_VBASE + U300_SYSCON_CIDR);
+	/* This is in funky bigendian order... */
+	val = (val & 0xFFU) << 8 | (val >> 8);
+	chip = db_chips;
+	chipname = unknown;
+
+	for ( ; chip->chipid; chip++) {
+		if (chip->chipid == (val & 0xFF00U)) {
+			chipname = chip->name;
+			break;
+		}
+	}
+	printk(KERN_INFO "Initializing U300 system on %s baseband chip " \
+	       "(chip ID 0x%04x)\n", chipname, val);
+
+#ifdef CONFIG_MACH_U300_BS26
+	if ((val & 0xFF00U) != 0xc800) {
+		printk(KERN_ERR "Platform configured for BS25/BS26 " \
+		       "with DB3150 but %s detected, expect problems!",
+		       chipname);
+	}
+#endif
+#ifdef CONFIG_MACH_U300_BS330
+	if ((val & 0xFF00U) != 0xd800) {
+		printk(KERN_ERR "Platform configured for BS330 " \
+		       "with DB3200 but %s detected, expect problems!",
+		       chipname);
+	}
+#endif
+#ifdef CONFIG_MACH_U300_BS335
+	if ((val & 0xFF00U) != 0xf000 && (val & 0xFF00U) != 0xf100) {
+		printk(KERN_ERR "Platform configured for BS365 " \
+		       " with DB3350 but %s detected, expect problems!",
+		       chipname);
+	}
+#endif
+#ifdef CONFIG_MACH_U300_BS365
+	if ((val & 0xFF00U) != 0xe800) {
+		printk(KERN_ERR "Platform configured for BS365 " \
+		       "with DB3210 but %s detected, expect problems!",
+		       chipname);
+	}
+#endif
+
+
+}
+
+/*
+ * Some devices and their resources require reserved physical memory from
+ * the end of the available RAM. This function traverses the list of devices
+ * and assigns actual adresses to these.
+ */
+static void __init u300_assign_physmem(void)
+{
+	unsigned long curr_start = __pa(high_memory);
+	int i, j;
+
+	for (i = 0; i < ARRAY_SIZE(platform_devs); i++) {
+		for (j = 0; j < platform_devs[i]->num_resources; j++) {
+			struct resource *const res =
+			  &platform_devs[i]->resource[j];
+
+			if (IORESOURCE_MEM == res->flags &&
+				     0 == res->start) {
+				res->start  = curr_start;
+				res->end   += curr_start;
+				curr_start += (res->end - res->start + 1);
+
+				printk(KERN_INFO "core.c: Mapping RAM " \
+				       "%#x-%#x to device %s:%s\n",
+					res->start, res->end,
+				       platform_devs[i]->name, res->name);
+			}
+		}
+	}
+}
+
+void __init u300_init_devices(void)
+{
+	int i;
+	u16 val;
+
+	/* Check what platform we run and print some status information */
+	u300_init_check_chip();
+
+	/* Set system to run at PLL208, max performance, a known state. */
+	val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
+	val &= ~U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK;
+	writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
+	/* Wait for the PLL208 to lock if not locked in yet */
+	while (!(readw(U300_SYSCON_VBASE + U300_SYSCON_CSR) &
+		 U300_SYSCON_CSR_PLL208_LOCK_IND));
+
+	/* Register the AMBA devices in the AMBA bus abstraction layer */
+	u300_clock_primecells();
+	for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
+		struct amba_device *d = amba_devs[i];
+		amba_device_register(d, &iomem_resource);
+	}
+	u300_unclock_primecells();
+
+	u300_assign_physmem();
+
+	/* Register the platform devices */
+	platform_add_devices(platform_devs, ARRAY_SIZE(platform_devs));
+
+#ifndef CONFIG_MACH_U300_SEMI_IS_SHARED
+	/*
+	 * Enable SEMI self refresh. Self-refresh of the SDRAM is entered when
+	 * both subsystems are requesting this mode.
+	 * If we not share the Acc SDRAM, this is never the case. Therefore
+	 * enable it here from the App side.
+	 */
+	val = readw(U300_SYSCON_VBASE + U300_SYSCON_SMCR) |
+		U300_SYSCON_SMCR_SEMI_SREFREQ_ENABLE;
+	writew(val, U300_SYSCON_VBASE + U300_SYSCON_SMCR);
+#endif /* CONFIG_MACH_U300_SEMI_IS_SHARED */
+}
+
+static int core_module_init(void)
+{
+	/*
+	 * This needs to be initialized later: it needs the input framework
+	 * to be initialized first.
+	 */
+	return mmc_init(&mmcsd_device);
+}
+module_init(core_module_init);