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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
130 lines
3.0 KiB
C
130 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018 Arm Ltd
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* Author: Liviu Dudau <liviu.dudau@foss.arm.com>
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*
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*/
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#include <common.h>
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#include <dm.h>
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#include <malloc.h>
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#include <dm/read.h>
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#include <asm/io.h>
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <misc.h>
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#define SYS_CFGDATA 0xa0
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#define SYS_CFGCTRL 0xa4
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#define SYS_CFGCTRL_START BIT(31)
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#define SYS_CFGCTRL_WRITE BIT(30)
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#define SYS_CFGSTAT 0xa8
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#define SYS_CFGSTAT_ERR BIT(1)
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#define SYS_CFGSTAT_COMPLETE BIT(0)
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struct vexpress_config_sysreg {
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phys_addr_t addr;
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u32 site;
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};
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static int vexpress_config_exec(struct vexpress_config_sysreg *syscfg,
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bool write, void *buf, int size)
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{
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u32 cmd, status, tries = 100;
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cmd = (*(u32 *)buf) | SYS_CFGCTRL_START | (syscfg->site << 16);
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if (!write) {
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/* write a canary in the data register for reads */
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writel(0xdeadbeef, syscfg->addr + SYS_CFGDATA);
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} else {
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cmd |= SYS_CFGCTRL_WRITE;
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writel(((u32 *)buf)[1], syscfg->addr + SYS_CFGDATA);
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}
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writel(0, syscfg->addr + SYS_CFGSTAT);
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writel(cmd, syscfg->addr + SYS_CFGCTRL);
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/* completion of command takes ages, go to sleep (150us) */
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do {
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udelay(150);
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status = readl(syscfg->addr + SYS_CFGSTAT);
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if (status & SYS_CFGSTAT_ERR)
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return -EFAULT;
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} while (--tries && !(status & SYS_CFGSTAT_COMPLETE));
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if (!tries)
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return -ETIMEDOUT;
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if (!write)
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(*(u32 *)buf) = readl(syscfg->addr + SYS_CFGDATA);
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return 0;
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}
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static int vexpress_config_read(struct udevice *dev,
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int offset, void *buf, int size)
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{
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struct vexpress_config_sysreg *priv = dev_get_uclass_priv(dev);
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if (size != sizeof(u32))
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return -EINVAL;
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return vexpress_config_exec(priv, false, buf, size);
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}
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static int vexpress_config_write(struct udevice *dev,
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int offset, const void *buf, int size)
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{
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struct vexpress_config_sysreg *priv = dev_get_uclass_priv(dev);
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if (size != sizeof(u32) * 2)
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return -EINVAL;
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return vexpress_config_exec(priv, true, (void *)buf, size);
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}
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static struct misc_ops vexpress_config_ops = {
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.read = vexpress_config_read,
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.write = vexpress_config_write,
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};
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static int vexpress_config_probe(struct udevice *dev)
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{
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struct ofnode_phandle_args args;
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struct vexpress_config_sysreg *priv = dev_get_priv(dev);
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const char *prop;
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int err, prop_size;
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err = dev_read_phandle_with_args(dev, "arm,vexpress,config-bridge",
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NULL, 0, 0, &args);
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if (err)
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return err;
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prop = ofnode_get_property(args.node, "compatible", &prop_size);
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if (!prop || (strncmp(prop, "arm,vexpress-sysreg", 19) != 0))
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return -ENOENT;
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if (!priv)
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return -ENOMEM;
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priv->addr = ofnode_get_addr(args.node);
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return dev_read_u32(dev, "arm,vexpress,site", &priv->site);
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}
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static const struct udevice_id vexpress_config_ids[] = {
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{ .compatible = "arm,vexpress,config-bus" },
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{ }
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};
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U_BOOT_DRIVER(vexpress_config_drv) = {
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.name = "vexpress_config_bus",
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.id = UCLASS_MISC,
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.of_match = vexpress_config_ids,
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.bind = dm_scan_fdt_dev,
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.probe = vexpress_config_probe,
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.ops = &vexpress_config_ops,
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.priv_auto = sizeof(struct vexpress_config_sysreg),
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};
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