[mirror_ubuntu-bionic-kernel.git] / arch / sh / boards / mach-sdk7786 / sram.c

/*
 * 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);
Commit	Line	Data
d8d6b902 PM	1	/*
	2	* SDK7786 FPGA SRAM Support.
	3	*
	4	* Copyright (C) 2010 Paul Mundt
	5	*
	6	* This file is subject to the terms and conditions of the GNU General Public
	7	* License. See the file "COPYING" in the main directory of this archive
	8	* for more details.
	9	*/
	10	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	11
	12	#include <linux/init.h>
	13	#include <linux/kernel.h>
	14	#include <linux/types.h>
	15	#include <linux/io.h>
	16	#include <linux/string.h>
	17	#include <mach/fpga.h>
	18	#include <asm/sram.h>
	19	#include <asm/sizes.h>
	20
	21	static int __init fpga_sram_init(void)
	22	{
	23	unsigned long phys;
	24	unsigned int area;
	25	void __iomem *vaddr;
	26	int ret;
	27	u16 data;
	28
	29	/* Enable FPGA SRAM */
	30	data = fpga_read_reg(LCLASR);
	31	data \|= LCLASR_FRAMEN;
	32	fpga_write_reg(data, LCLASR);
	33
	34	/*
	35	* FPGA_SEL determines the area mapping
	36	*/
	37	area = (data & LCLASR_FPGA_SEL_MASK) >> LCLASR_FPGA_SEL_SHIFT;
	38	if (unlikely(area == LCLASR_AREA_MASK)) {
	39	pr_err("FPGA memory unmapped.\n");
	40	return -ENXIO;
	41	}
	42
	43	/*
	44	* The memory itself occupies a 2KiB range at the top of the area
	45	* immediately below the system registers.
	46	*/
	47	phys = (area << 26) + SZ_64M - SZ_4K;
	48
	49	/*
	50	* The FPGA SRAM resides in translatable physical space, so set
	51	* up a mapping prior to inserting it in to the pool.
	52	*/
	53	vaddr = ioremap(phys, SZ_2K);
	54	if (unlikely(!vaddr)) {
	55	pr_err("Failed remapping FPGA memory.\n");
	56	return -ENXIO;
	57	}
	58
	59	pr_info("Adding %dKiB of FPGA memory at 0x%08lx-0x%08lx "
	60	"(area %d) to pool.\n",
	61	SZ_2K >> 10, phys, phys + SZ_2K - 1, area);
	62
	63	ret = gen_pool_add(sram_pool, (unsigned long)vaddr, SZ_2K, -1);
	64	if (unlikely(ret < 0)) {
65	pr_err("Failed adding memory\n");
66	iounmap(vaddr);
67	return ret;
68	}
69
70	return 0;
71	}
72	postcore_initcall(fpga_sram_init);