forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
185 lines
5.0 KiB
185 lines
5.0 KiB
// 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 <[email protected]> |
|
* 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
|
|
|