From d8d6b902b8a3b2c66151529694bb4a9a3555cf43 Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Fri, 15 Oct 2010 02:13:04 +0900 Subject: [PATCH] sh: mach-sdk7786: Add support for the FPGA SRAM. This ties in the 2KiB of FPGA SRAM in to the generic SRAM pool. Signed-off-by: Paul Mundt --- arch/sh/boards/Kconfig | 1 + arch/sh/boards/mach-sdk7786/Makefile | 3 +- arch/sh/boards/mach-sdk7786/sram.c | 72 ++++++++++++++++++++++++ arch/sh/include/asm/sizes.h | 1 + arch/sh/include/mach-sdk7786/mach/fpga.h | 17 +++++- 5 files changed, 92 insertions(+), 2 deletions(-) create mode 100644 arch/sh/boards/mach-sdk7786/sram.c diff --git a/arch/sh/boards/Kconfig b/arch/sh/boards/Kconfig index bb2cb27074e9..9c94711aa6ca 100644 --- a/arch/sh/boards/Kconfig +++ b/arch/sh/boards/Kconfig @@ -156,6 +156,7 @@ config SH_SDK7786 select SYS_SUPPORTS_PCI select NO_IOPORT if !PCI select ARCH_WANT_OPTIONAL_GPIOLIB + select HAVE_SRAM_POOL help Select SDK7786 if configuring for a Renesas Technology Europe SH7786-65nm board. diff --git a/arch/sh/boards/mach-sdk7786/Makefile b/arch/sh/boards/mach-sdk7786/Makefile index d0f801bd8416..23ff7d4ac491 100644 --- a/arch/sh/boards/mach-sdk7786/Makefile +++ b/arch/sh/boards/mach-sdk7786/Makefile @@ -1,3 +1,4 @@ -obj-y := setup.o fpga.o irq.o +obj-y := fpga.o irq.o setup.o obj-$(CONFIG_GENERIC_GPIO) += gpio.o +obj-$(CONFIG_HAVE_SRAM_POOL) += sram.o diff --git a/arch/sh/boards/mach-sdk7786/sram.c b/arch/sh/boards/mach-sdk7786/sram.c new file mode 100644 index 000000000000..c81c3abbe01c --- /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 +#include +#include +#include +#include +#include +#include +#include + +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); diff --git a/arch/sh/include/asm/sizes.h b/arch/sh/include/asm/sizes.h index 3a1fb97770f1..0b9fe2d5c36d 100644 --- a/arch/sh/include/asm/sizes.h +++ b/arch/sh/include/asm/sizes.h @@ -32,6 +32,7 @@ #define SZ_512 0x00000200 #define SZ_1K 0x00000400 +#define SZ_2K 0x00000800 #define SZ_4K 0x00001000 #define SZ_8K 0x00002000 #define SZ_16K 0x00004000 diff --git a/arch/sh/include/mach-sdk7786/mach/fpga.h b/arch/sh/include/mach-sdk7786/mach/fpga.h index b7d93699b679..40f0c2d3690c 100644 --- a/arch/sh/include/mach-sdk7786/mach/fpga.h +++ b/arch/sh/include/mach-sdk7786/mach/fpga.h @@ -43,8 +43,23 @@ #define FAER 0x150 #define USRGPIR 0x160 + /* 0x170 reserved */ -#define LCLASR 0x180 + +#define LCLASR 0x180 +#define LCLASR_FRAMEN BIT(15) + +#define LCLASR_FPGA_SEL_SHIFT 12 +#define LCLASR_NAND_SEL_SHIFT 8 +#define LCLASR_NORB_SEL_SHIFT 4 +#define LCLASR_NORA_SEL_SHIFT 0 + +#define LCLASR_AREA_MASK 0x7 + +#define LCLASR_FPGA_SEL_MASK (LCLASR_AREA_MASK << LCLASR_FPGA_SEL_SHIFT) +#define LCLASR_NAND_SEL_MASK (LCLASR_AREA_MASK << LCLASR_NAND_SEL_SHIFT) +#define LCLASR_NORB_SEL_MASK (LCLASR_AREA_MASK << LCLASR_NORB_SEL_SHIFT) +#define LCLASR_NORA_SEL_MASK (LCLASR_AREA_MASK << LCLASR_NORA_SEL_SHIFT) #define SBCR 0x190 #define SCBR_I2CMEN BIT(0) /* FPGA I2C master enable */ -- 2.20.1