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author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-25 14:51:49 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-25 14:51:49 (GMT) |
commit | 1dfd166e93f98892aa4427069a23ed73259983c8 (patch) | |
tree | c70a347b963091b99bd16842537153fa36e5c0e9 /arch/sh/boards/mach-sdk7786/sram.c | |
parent | 8e775167d54e6521e7cdbc03ee7ec42a8c67b49a (diff) | |
parent | 8df399018df120d28f89fda6f2515cc6e096e43d (diff) | |
download | linux-fsl-qoriq-1dfd166e93f98892aa4427069a23ed73259983c8.tar.xz |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6: (110 commits)
sh: i2c-sh7760: Replase from ctrl_* to __raw_*
sh: clkfwk: Shuffle around to match the intc split up.
sh: clkfwk: modify for_each_frequency end condition
sh: fix clk_get() error handling
sh: clkfwk: Fix fault in frequency iterator.
sh: clkfwk: Add a helper for rate rounding by divisor ranges.
sh: clkfwk: Abstract rate rounding helper.
sh: clkfwk: support clock remapping.
sh: pci: Convert to upper/lower_32_bits() helpers.
sh: mach-sdk7786: Add support for the FPGA SRAM.
sh: Provide a generic SRAM pool for tiny memories.
sh: pci: Support secondary FPGA-driven PCIe clocks on SDK7786.
sh: pci: Support slot 4 routing on SDK7786.
sh: Fix up PMB locking.
sh: mach-sdk7786: Add support for fpga gpios.
sh: use pr_fmt for clock framework, too.
sh: remove name and id from struct clk
sh: free-without-alloc fix for sh_mobile_lcdcfb
sh: perf: Set up perf_max_events.
sh: perf: Support SH-X3 hardware counters.
...
Fix up trivial conflicts (perf_max_events got removed) in arch/sh/kernel/perf_event.c
Diffstat (limited to 'arch/sh/boards/mach-sdk7786/sram.c')
-rw-r--r-- | arch/sh/boards/mach-sdk7786/sram.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/sh/boards/mach-sdk7786/sram.c b/arch/sh/boards/mach-sdk7786/sram.c new file mode 100644 index 0000000..c81c3ab --- /dev/null +++ b/arch/sh/boards/mach-sdk7786/sram.c @@ -0,0 +1,72 @@ +/* + * SDK7786 FPGA SRAM Support. + * + * Copyright (C) 2010 Paul Mundt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/io.h> +#include <linux/string.h> +#include <mach/fpga.h> +#include <asm/sram.h> +#include <asm/sizes.h> + +static int __init fpga_sram_init(void) +{ + unsigned long phys; + unsigned int area; + void __iomem *vaddr; + int ret; + u16 data; + + /* Enable FPGA SRAM */ + data = fpga_read_reg(LCLASR); + data |= LCLASR_FRAMEN; + fpga_write_reg(data, LCLASR); + + /* + * FPGA_SEL determines the area mapping + */ + area = (data & LCLASR_FPGA_SEL_MASK) >> LCLASR_FPGA_SEL_SHIFT; + if (unlikely(area == LCLASR_AREA_MASK)) { + pr_err("FPGA memory unmapped.\n"); + return -ENXIO; + } + + /* + * The memory itself occupies a 2KiB range at the top of the area + * immediately below the system registers. + */ + phys = (area << 26) + SZ_64M - SZ_4K; + + /* + * The FPGA SRAM resides in translatable physical space, so set + * up a mapping prior to inserting it in to the pool. + */ + vaddr = ioremap(phys, SZ_2K); + if (unlikely(!vaddr)) { + pr_err("Failed remapping FPGA memory.\n"); + return -ENXIO; + } + + pr_info("Adding %dKiB of FPGA memory at 0x%08lx-0x%08lx " + "(area %d) to pool.\n", + SZ_2K >> 10, phys, phys + SZ_2K - 1, area); + + ret = gen_pool_add(sram_pool, (unsigned long)vaddr, SZ_2K, -1); + if (unlikely(ret < 0)) { + pr_err("Failed adding memory\n"); + iounmap(vaddr); + return ret; + } + + return 0; +} +postcore_initcall(fpga_sram_init); |