ARM: bcm2835: Move to mach-bcm directory

Move the bcm2835 board file into the mach-bcm directory. This allows us
to get rid of the mach-bcm2835 directory with the associated Kconfig
and Makefile.

Signed-off-by: Markus Mayer <markus.mayer@linaro.org>
[swarren, adjust defconfig so ARCH_BCM2835 still gets enabled]
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>

3 files changed, 155 insertions, 0 deletions

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index b1aa6a9b3bd1..4e466e9eef44 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -32,6 +32,22 @@ config ARCH_BCM_MOBILE
           BCM11130, BCM11140, BCM11351, BCM28145 and
           BCM28155 variants.
 
+config ARCH_BCM2835
+        bool "Broadcom BCM2835 family" if ARCH_MULTI_V6
+        select ARCH_REQUIRE_GPIOLIB
+        select ARM_AMBA
+        select ARM_ERRATA_411920
+        select ARM_TIMER_SP804
+        select CLKDEV_LOOKUP
+        select CLKSRC_OF
+        select CPU_V6
+        select GENERIC_CLOCKEVENTS
+        select PINCTRL
+        select PINCTRL_BCM2835
+        help
+          This enables support for the Broadcom BCM2835 SoC. This SoC is
+          used in the Raspberry Pi and Roku 2 devices.
+
 endmenu
 
 endif
diff --git a/arch/arm/mach-bcm/Makefile b/arch/arm/mach-bcm/Makefile
index c2ccd5a0f772..0ad293882079 100644
--- a/arch/arm/mach-bcm/Makefile
+++ b/arch/arm/mach-bcm/Makefile
@@ -11,5 +11,7 @@
 # GNU General Public License for more details.
 
 obj-$(CONFIG_ARCH_BCM_MOBILE)   := board_bcm281xx.o bcm_kona_smc.o bcm_kona_smc_asm.o kona.o
+obj-$(CONFIG_ARCH_BCM2835)      += board_bcm2835.o
+
 plus_sec := $(call as-instr,.arch_extension sec,+sec)
 AFLAGS_bcm_kona_smc_asm.o       :=-Wa,-march=armv7-a$(plus_sec)
diff --git a/arch/arm/mach-bcm/board_bcm2835.c b/arch/arm/mach-bcm/board_bcm2835.c
new file mode 100644
index 000000000000..70f2f3925f0e
--- /dev/null
+++ b/arch/arm/mach-bcm/board_bcm2835.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2010 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/irqchip.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/clk/bcm2835.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#define PM_RSTC                         0x1c
+#define PM_RSTS                         0x20
+#define PM_WDOG                         0x24
+
+#define PM_PASSWORD                     0x5a000000
+#define PM_RSTC_WRCFG_MASK              0x00000030
+#define PM_RSTC_WRCFG_FULL_RESET        0x00000020
+#define PM_RSTS_HADWRH_SET              0x00000040
+
+#define BCM2835_PERIPH_PHYS     0x20000000
+#define BCM2835_PERIPH_VIRT     0xf0000000
+#define BCM2835_PERIPH_SIZE     SZ_16M
+
+static void __iomem *wdt_regs;
+
+/*
+ * The machine restart method can be called from an atomic context so we won't
+ * be able to ioremap the regs then.
+ */
+static void bcm2835_setup_restart(void)
+{
+        struct device_node *np = of_find_compatible_node(NULL, NULL,
+                                                "brcm,bcm2835-pm-wdt");
+        if (WARN(!np, "unable to setup watchdog restart"))
+                return;
+
+        wdt_regs = of_iomap(np, 0);
+        WARN(!wdt_regs, "failed to remap watchdog regs");
+}
+
+static void bcm2835_restart(enum reboot_mode mode, const char *cmd)
+{
+        u32 val;
+
+        if (!wdt_regs)
+                return;
+
+        /* use a timeout of 10 ticks (~150us) */
+        writel_relaxed(10 | PM_PASSWORD, wdt_regs + PM_WDOG);
+        val = readl_relaxed(wdt_regs + PM_RSTC);
+        val &= ~PM_RSTC_WRCFG_MASK;
+        val |= PM_PASSWORD | PM_RSTC_WRCFG_FULL_RESET;
+        writel_relaxed(val, wdt_regs + PM_RSTC);
+
+        /* No sleeping, possibly atomic. */
+        mdelay(1);
+}
+
+/*
+ * We can't really power off, but if we do the normal reset scheme, and
+ * indicate to bootcode.bin not to reboot, then most of the chip will be
+ * powered off.
+ */
+static void bcm2835_power_off(void)
+{
+        u32 val;
+
+        /*
+         * We set the watchdog hard reset bit here to distinguish this reset
+         * from the normal (full) reset. bootcode.bin will not reboot after a
+         * hard reset.
+         */
+        val = readl_relaxed(wdt_regs + PM_RSTS);
+        val &= ~PM_RSTC_WRCFG_MASK;
+        val |= PM_PASSWORD | PM_RSTS_HADWRH_SET;
+        writel_relaxed(val, wdt_regs + PM_RSTS);
+
+        /* Continue with normal reset mechanism */
+        bcm2835_restart(REBOOT_HARD, "");
+}
+
+static struct map_desc io_map __initdata = {
+        .virtual = BCM2835_PERIPH_VIRT,
+        .pfn = __phys_to_pfn(BCM2835_PERIPH_PHYS),
+        .length = BCM2835_PERIPH_SIZE,
+        .type = MT_DEVICE
+};
+
+static void __init bcm2835_map_io(void)
+{
+        iotable_init(&io_map, 1);
+}
+
+static void __init bcm2835_init(void)
+{
+        int ret;
+
+        bcm2835_setup_restart();
+        if (wdt_regs)
+                pm_power_off = bcm2835_power_off;
+
+        bcm2835_init_clocks();
+
+        ret = of_platform_populate(NULL, of_default_bus_match_table, NULL,
+                                   NULL);
+        if (ret) {
+                pr_err("of_platform_populate failed: %d\n", ret);
+                BUG();
+        }
+}
+
+static const char * const bcm2835_compat[] = {
+        "brcm,bcm2835",
+        NULL
+};
+
+DT_MACHINE_START(BCM2835, "BCM2835")
+        .map_io = bcm2835_map_io,
+        .init_irq = irqchip_init,
+        .init_machine = bcm2835_init,
+        .restart = bcm2835_restart,
+        .dt_compat = bcm2835_compat
+MACHINE_END