diff options
Diffstat (limited to 'arch/arm/mach-versatile/versatile.c')
| -rw-r--r-- | arch/arm/mach-versatile/versatile.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/arch/arm/mach-versatile/versatile.c b/arch/arm/mach-versatile/versatile.c new file mode 100644 index 000000000..02ba68abe --- /dev/null +++ b/arch/arm/mach-versatile/versatile.c @@ -0,0 +1,185 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Versatile board support using the device tree + * + * Copyright (C) 2010 Secret Lab Technologies Ltd. + * Copyright (C) 2009 Jeremy Kerr <jeremy.kerr@canonical.com> + * Copyright (C) 2004 ARM Limited + * Copyright (C) 2000 Deep Blue Solutions Ltd + */ + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/slab.h> +#include <linux/amba/bus.h> +#include <linux/amba/mmci.h> +#include <asm/mach-types.h> +#include <asm/mach/arch.h> +#include <asm/mach/map.h> + +/* macro to get at MMIO space when running virtually */ +#define IO_ADDRESS(x) (((x) & 0x0fffffff) + (((x) >> 4) & 0x0f000000) + 0xf0000000) +#define __io_address(n) ((void __iomem __force *)IO_ADDRESS(n)) + +/* + * ------------------------------------------------------------------------ + * Versatile Registers + * ------------------------------------------------------------------------ + */ +#define VERSATILE_SYS_PCICTL_OFFSET 0x44 +#define VERSATILE_SYS_MCI_OFFSET 0x48 + +/* + * VERSATILE peripheral addresses + */ +#define VERSATILE_MMCI0_BASE 0x10005000 /* MMC interface */ +#define VERSATILE_MMCI1_BASE 0x1000B000 /* MMC Interface */ +#define VERSATILE_SCTL_BASE 0x101E0000 /* System controller */ + +/* + * System controller bit assignment + */ +#define VERSATILE_REFCLK 0 +#define VERSATILE_TIMCLK 1 + +#define VERSATILE_TIMER1_EnSel 15 +#define VERSATILE_TIMER2_EnSel 17 +#define VERSATILE_TIMER3_EnSel 19 +#define VERSATILE_TIMER4_EnSel 21 + +static void __iomem *versatile_sys_base; + +unsigned int mmc_status(struct device *dev) +{ + struct amba_device *adev = container_of(dev, struct amba_device, dev); + u32 mask; + + if (adev->res.start == VERSATILE_MMCI0_BASE) + mask = 1; + else + mask = 2; + + return readl(versatile_sys_base + VERSATILE_SYS_MCI_OFFSET) & mask; +} + +static struct mmci_platform_data mmc0_plat_data = { + .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34, + .status = mmc_status, +}; + +static struct mmci_platform_data mmc1_plat_data = { + .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34, + .status = mmc_status, +}; + +/* + * Lookup table for attaching a specific name and platform_data pointer to + * devices as they get created by of_platform_populate(). Ideally this table + * would not exist, but the current clock implementation depends on some devices + * having a specific name. + */ +struct of_dev_auxdata versatile_auxdata_lookup[] __initdata = { + OF_DEV_AUXDATA("arm,primecell", VERSATILE_MMCI0_BASE, "fpga:05", &mmc0_plat_data), + OF_DEV_AUXDATA("arm,primecell", VERSATILE_MMCI1_BASE, "fpga:0b", &mmc1_plat_data), + {} +}; + +static struct map_desc versatile_io_desc[] __initdata __maybe_unused = { + { + .virtual = IO_ADDRESS(VERSATILE_SCTL_BASE), + .pfn = __phys_to_pfn(VERSATILE_SCTL_BASE), + .length = SZ_4K * 9, + .type = MT_DEVICE + } +}; + +static void __init versatile_map_io(void) +{ + debug_ll_io_init(); + iotable_init(versatile_io_desc, ARRAY_SIZE(versatile_io_desc)); +} + +static void __init versatile_init_early(void) +{ + u32 val; + + /* + * set clock frequency: + * VERSATILE_REFCLK is 32KHz + * VERSATILE_TIMCLK is 1MHz + */ + val = readl(__io_address(VERSATILE_SCTL_BASE)); + writel((VERSATILE_TIMCLK << VERSATILE_TIMER1_EnSel) | + (VERSATILE_TIMCLK << VERSATILE_TIMER2_EnSel) | + (VERSATILE_TIMCLK << VERSATILE_TIMER3_EnSel) | + (VERSATILE_TIMCLK << VERSATILE_TIMER4_EnSel) | val, + __io_address(VERSATILE_SCTL_BASE)); +} + +static void __init versatile_dt_pci_init(void) +{ + u32 val; + struct device_node *np; + struct property *newprop; + + np = of_find_compatible_node(NULL, NULL, "arm,versatile-pci"); + if (!np) + return; + + /* Check if PCI backplane is detected */ + val = readl(versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET); + if (val & 1) { + /* + * Enable PCI accesses. Note that the documentaton is + * inconsistent whether or not this is needed, but the old + * driver had it so we will keep it. + */ + writel(1, versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET); + goto out_put_node; + } + + newprop = kzalloc(sizeof(*newprop), GFP_KERNEL); + if (!newprop) + goto out_put_node; + + newprop->name = kstrdup("status", GFP_KERNEL); + newprop->value = kstrdup("disabled", GFP_KERNEL); + newprop->length = sizeof("disabled"); + of_update_property(np, newprop); + + pr_info("Not plugged into PCI backplane!\n"); + +out_put_node: + of_node_put(np); +} + +static void __init versatile_dt_init(void) +{ + struct device_node *np; + + np = of_find_compatible_node(NULL, NULL, "arm,core-module-versatile"); + if (np) + versatile_sys_base = of_iomap(np, 0); + WARN_ON(!versatile_sys_base); + + versatile_dt_pci_init(); + + of_platform_default_populate(NULL, versatile_auxdata_lookup, NULL); +} + +static const char *const versatile_dt_match[] __initconst = { + "arm,versatile-ab", + "arm,versatile-pb", + NULL, +}; + +DT_MACHINE_START(VERSATILE_PB, "ARM-Versatile (Device Tree Support)") + .map_io = versatile_map_io, + .init_early = versatile_init_early, + .init_machine = versatile_dt_init, + .dt_compat = versatile_dt_match, +MACHINE_END |