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12c3dca25d
The MaverickCrunch support for ep93xx never made it into glibc and was removed from gcc in its 4.8 release in 2012. It is now one of the last parts of arch/arm/ that fails to build with the clang integrated assembler, which is unlikely to ever want to support it. The two alternatives are to force the use of binutils/gas when building the crunch support, or to remove it entirely. According to Hartley Sweeten: "Martin Guy did a lot of work trying to get the maverick crunch working but I was never able to successfully use it for anything. It "kind" of works but depending on the EP93xx silicon revision there are still a number of hardware bugs that either give imprecise or garbage results. I have no problem with removing the kernel support for the maverick crunch." Unless someone else comes up with a good reason to keep it around, remove it now. This touches mostly the ep93xx platform, but removes a bit of code from ARM common ptrace and signal frame handling as well. If there are remaining users of MaverickCrunch, they can use LTS kernels for at least another five years before kernel support ends. Link: https://lore.kernel.org/linux-arm-kernel/20210802141245.1146772-1-arnd@kernel.org/ Link: https://lore.kernel.org/linux-arm-kernel/20210226164345.3889993-1-arnd@kernel.org/ Link: https://github.com/ClangBuiltLinux/linux/issues/1272 Link: https://gcc.gnu.org/legacy-ml/gcc/2008-03/msg01063.html Cc: "Martin Guy" <martinwguy@martinwguy@gmail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
161 lines
4 KiB
C
161 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* arch/arm/mach-ep93xx/snappercl15.c
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* Bluewater Systems Snapper CL15 system module
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*
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* Copyright (C) 2009 Bluewater Systems Ltd
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* Author: Ryan Mallon
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*
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* NAND code adapted from driver by:
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* Andre Renaud <andre@bluewatersys.com>
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* James R. McKaskill
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*/
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#include <linux/platform_device.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/i2c.h>
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#include <linux/fb.h>
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#include <linux/mtd/platnand.h>
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#include "hardware.h"
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#include <linux/platform_data/video-ep93xx.h>
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#include "gpio-ep93xx.h"
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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#include "soc.h"
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#define SNAPPERCL15_NAND_BASE (EP93XX_CS7_PHYS_BASE + SZ_16M)
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#define SNAPPERCL15_NAND_WPN (1 << 8) /* Write protect (active low) */
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#define SNAPPERCL15_NAND_ALE (1 << 9) /* Address latch */
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#define SNAPPERCL15_NAND_CLE (1 << 10) /* Command latch */
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#define SNAPPERCL15_NAND_CEN (1 << 11) /* Chip enable (active low) */
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#define SNAPPERCL15_NAND_RDY (1 << 14) /* Device ready */
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#define NAND_CTRL_ADDR(chip) (chip->legacy.IO_ADDR_W + 0x40)
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static void snappercl15_nand_cmd_ctrl(struct nand_chip *chip, int cmd,
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unsigned int ctrl)
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{
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static u16 nand_state = SNAPPERCL15_NAND_WPN;
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u16 set;
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if (ctrl & NAND_CTRL_CHANGE) {
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set = SNAPPERCL15_NAND_CEN | SNAPPERCL15_NAND_WPN;
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if (ctrl & NAND_NCE)
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set &= ~SNAPPERCL15_NAND_CEN;
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if (ctrl & NAND_CLE)
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set |= SNAPPERCL15_NAND_CLE;
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if (ctrl & NAND_ALE)
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set |= SNAPPERCL15_NAND_ALE;
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nand_state &= ~(SNAPPERCL15_NAND_CEN |
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SNAPPERCL15_NAND_CLE |
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SNAPPERCL15_NAND_ALE);
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nand_state |= set;
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__raw_writew(nand_state, NAND_CTRL_ADDR(chip));
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}
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if (cmd != NAND_CMD_NONE)
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__raw_writew((cmd & 0xff) | nand_state,
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chip->legacy.IO_ADDR_W);
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}
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static int snappercl15_nand_dev_ready(struct nand_chip *chip)
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{
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return !!(__raw_readw(NAND_CTRL_ADDR(chip)) & SNAPPERCL15_NAND_RDY);
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}
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static struct mtd_partition snappercl15_nand_parts[] = {
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{
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.name = "Kernel",
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.offset = 0,
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.size = SZ_2M,
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},
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{
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.name = "Filesystem",
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.offset = MTDPART_OFS_APPEND,
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.size = MTDPART_SIZ_FULL,
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},
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};
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static struct platform_nand_data snappercl15_nand_data = {
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.chip = {
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.nr_chips = 1,
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.partitions = snappercl15_nand_parts,
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.nr_partitions = ARRAY_SIZE(snappercl15_nand_parts),
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.chip_delay = 25,
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},
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.ctrl = {
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.dev_ready = snappercl15_nand_dev_ready,
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.cmd_ctrl = snappercl15_nand_cmd_ctrl,
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},
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};
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static struct resource snappercl15_nand_resource[] = {
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{
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.start = SNAPPERCL15_NAND_BASE,
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.end = SNAPPERCL15_NAND_BASE + SZ_4K - 1,
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.flags = IORESOURCE_MEM,
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},
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};
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static struct platform_device snappercl15_nand_device = {
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.name = "gen_nand",
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.id = -1,
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.dev.platform_data = &snappercl15_nand_data,
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.resource = snappercl15_nand_resource,
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.num_resources = ARRAY_SIZE(snappercl15_nand_resource),
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};
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static struct ep93xx_eth_data __initdata snappercl15_eth_data = {
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.phy_id = 1,
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};
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static struct i2c_board_info __initdata snappercl15_i2c_data[] = {
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{
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/* Audio codec */
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I2C_BOARD_INFO("tlv320aic23", 0x1a),
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},
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};
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static struct ep93xxfb_mach_info __initdata snappercl15_fb_info = {
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};
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static struct platform_device snappercl15_audio_device = {
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.name = "snappercl15-audio",
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.id = -1,
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};
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static void __init snappercl15_register_audio(void)
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{
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ep93xx_register_i2s();
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platform_device_register(&snappercl15_audio_device);
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}
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static void __init snappercl15_init_machine(void)
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{
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ep93xx_init_devices();
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ep93xx_register_eth(&snappercl15_eth_data, 1);
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ep93xx_register_i2c(snappercl15_i2c_data,
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ARRAY_SIZE(snappercl15_i2c_data));
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ep93xx_register_fb(&snappercl15_fb_info);
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snappercl15_register_audio();
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platform_device_register(&snappercl15_nand_device);
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}
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MACHINE_START(SNAPPER_CL15, "Bluewater Systems Snapper CL15")
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/* Maintainer: Ryan Mallon */
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.atag_offset = 0x100,
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.map_io = ep93xx_map_io,
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.init_irq = ep93xx_init_irq,
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.init_time = ep93xx_timer_init,
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.init_machine = snappercl15_init_machine,
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.restart = ep93xx_restart,
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MACHINE_END
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