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419 lines
10 KiB
419 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* |
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* Copyright (C) 2014 ARM Limited |
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*/ |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/of_device.h> |
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#include <linux/sched/signal.h> |
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#include <linux/slab.h> |
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#include <linux/vexpress.h> |
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#define SYS_MISC 0x0 |
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#define SYS_MISC_MASTERSITE (1 << 14) |
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#define SYS_PROCID0 0x24 |
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#define SYS_PROCID1 0x28 |
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#define SYS_HBI_MASK 0xfff |
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#define SYS_PROCIDx_HBI_SHIFT 0 |
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#define SYS_CFGDATA 0x40 |
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#define SYS_CFGCTRL 0x44 |
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#define SYS_CFGCTRL_START (1 << 31) |
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#define SYS_CFGCTRL_WRITE (1 << 30) |
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#define SYS_CFGCTRL_DCC(n) (((n) & 0xf) << 26) |
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#define SYS_CFGCTRL_FUNC(n) (((n) & 0x3f) << 20) |
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#define SYS_CFGCTRL_SITE(n) (((n) & 0x3) << 16) |
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#define SYS_CFGCTRL_POSITION(n) (((n) & 0xf) << 12) |
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#define SYS_CFGCTRL_DEVICE(n) (((n) & 0xfff) << 0) |
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#define SYS_CFGSTAT 0x48 |
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#define SYS_CFGSTAT_ERR (1 << 1) |
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#define SYS_CFGSTAT_COMPLETE (1 << 0) |
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#define VEXPRESS_SITE_MB 0 |
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#define VEXPRESS_SITE_DB1 1 |
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#define VEXPRESS_SITE_DB2 2 |
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#define VEXPRESS_SITE_MASTER 0xf |
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struct vexpress_syscfg { |
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struct device *dev; |
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void __iomem *base; |
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struct list_head funcs; |
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}; |
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struct vexpress_syscfg_func { |
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struct list_head list; |
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struct vexpress_syscfg *syscfg; |
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struct regmap *regmap; |
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int num_templates; |
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u32 template[]; /* Keep it last! */ |
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}; |
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struct vexpress_config_bridge_ops { |
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struct regmap * (*regmap_init)(struct device *dev, void *context); |
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void (*regmap_exit)(struct regmap *regmap, void *context); |
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}; |
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struct vexpress_config_bridge { |
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struct vexpress_config_bridge_ops *ops; |
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void *context; |
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}; |
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static DEFINE_MUTEX(vexpress_config_mutex); |
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static u32 vexpress_config_site_master = VEXPRESS_SITE_MASTER; |
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static void vexpress_config_set_master(u32 site) |
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{ |
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vexpress_config_site_master = site; |
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} |
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static void vexpress_config_lock(void *arg) |
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{ |
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mutex_lock(&vexpress_config_mutex); |
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} |
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static void vexpress_config_unlock(void *arg) |
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{ |
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mutex_unlock(&vexpress_config_mutex); |
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} |
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static void vexpress_config_find_prop(struct device_node *node, |
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const char *name, u32 *val) |
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{ |
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/* Default value */ |
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*val = 0; |
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of_node_get(node); |
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while (node) { |
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if (of_property_read_u32(node, name, val) == 0) { |
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of_node_put(node); |
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return; |
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} |
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node = of_get_next_parent(node); |
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} |
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} |
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static int vexpress_config_get_topo(struct device_node *node, u32 *site, |
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u32 *position, u32 *dcc) |
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{ |
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vexpress_config_find_prop(node, "arm,vexpress,site", site); |
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if (*site == VEXPRESS_SITE_MASTER) |
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*site = vexpress_config_site_master; |
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if (WARN_ON(vexpress_config_site_master == VEXPRESS_SITE_MASTER)) |
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return -EINVAL; |
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vexpress_config_find_prop(node, "arm,vexpress,position", position); |
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vexpress_config_find_prop(node, "arm,vexpress,dcc", dcc); |
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return 0; |
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} |
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static void vexpress_config_devres_release(struct device *dev, void *res) |
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{ |
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struct vexpress_config_bridge *bridge = dev_get_drvdata(dev->parent); |
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struct regmap *regmap = res; |
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bridge->ops->regmap_exit(regmap, bridge->context); |
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} |
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struct regmap *devm_regmap_init_vexpress_config(struct device *dev) |
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{ |
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struct vexpress_config_bridge *bridge; |
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struct regmap *regmap; |
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struct regmap **res; |
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bridge = dev_get_drvdata(dev->parent); |
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if (WARN_ON(!bridge)) |
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return ERR_PTR(-EINVAL); |
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res = devres_alloc(vexpress_config_devres_release, sizeof(*res), |
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GFP_KERNEL); |
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if (!res) |
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return ERR_PTR(-ENOMEM); |
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regmap = (bridge->ops->regmap_init)(dev, bridge->context); |
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if (IS_ERR(regmap)) { |
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devres_free(res); |
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return regmap; |
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} |
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*res = regmap; |
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devres_add(dev, res); |
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return regmap; |
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} |
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EXPORT_SYMBOL_GPL(devm_regmap_init_vexpress_config); |
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static int vexpress_syscfg_exec(struct vexpress_syscfg_func *func, |
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int index, bool write, u32 *data) |
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{ |
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struct vexpress_syscfg *syscfg = func->syscfg; |
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u32 command, status; |
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int tries; |
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long timeout; |
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if (WARN_ON(index >= func->num_templates)) |
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return -EINVAL; |
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command = readl(syscfg->base + SYS_CFGCTRL); |
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if (WARN_ON(command & SYS_CFGCTRL_START)) |
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return -EBUSY; |
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command = func->template[index]; |
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command |= SYS_CFGCTRL_START; |
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command |= write ? SYS_CFGCTRL_WRITE : 0; |
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/* Use a canary for reads */ |
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if (!write) |
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*data = 0xdeadbeef; |
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dev_dbg(syscfg->dev, "func %p, command %x, data %x\n", |
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func, command, *data); |
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writel(*data, syscfg->base + SYS_CFGDATA); |
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writel(0, syscfg->base + SYS_CFGSTAT); |
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writel(command, syscfg->base + SYS_CFGCTRL); |
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mb(); |
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/* The operation can take ages... Go to sleep, 100us initially */ |
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tries = 100; |
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timeout = 100; |
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do { |
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if (!irqs_disabled()) { |
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set_current_state(TASK_INTERRUPTIBLE); |
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schedule_timeout(usecs_to_jiffies(timeout)); |
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if (signal_pending(current)) |
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return -EINTR; |
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} else { |
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udelay(timeout); |
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} |
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status = readl(syscfg->base + SYS_CFGSTAT); |
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if (status & SYS_CFGSTAT_ERR) |
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return -EFAULT; |
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if (timeout > 20) |
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timeout -= 20; |
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} while (--tries && !(status & SYS_CFGSTAT_COMPLETE)); |
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if (WARN_ON_ONCE(!tries)) |
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return -ETIMEDOUT; |
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if (!write) { |
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*data = readl(syscfg->base + SYS_CFGDATA); |
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dev_dbg(syscfg->dev, "func %p, read data %x\n", func, *data); |
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} |
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return 0; |
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} |
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static int vexpress_syscfg_read(void *context, unsigned int index, |
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unsigned int *val) |
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{ |
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struct vexpress_syscfg_func *func = context; |
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return vexpress_syscfg_exec(func, index, false, val); |
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} |
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static int vexpress_syscfg_write(void *context, unsigned int index, |
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unsigned int val) |
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{ |
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struct vexpress_syscfg_func *func = context; |
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return vexpress_syscfg_exec(func, index, true, &val); |
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} |
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static struct regmap_config vexpress_syscfg_regmap_config = { |
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.lock = vexpress_config_lock, |
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.unlock = vexpress_config_unlock, |
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.reg_bits = 32, |
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.val_bits = 32, |
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.reg_read = vexpress_syscfg_read, |
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.reg_write = vexpress_syscfg_write, |
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.reg_format_endian = REGMAP_ENDIAN_LITTLE, |
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.val_format_endian = REGMAP_ENDIAN_LITTLE, |
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}; |
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static struct regmap *vexpress_syscfg_regmap_init(struct device *dev, |
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void *context) |
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{ |
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int err; |
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struct vexpress_syscfg *syscfg = context; |
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struct vexpress_syscfg_func *func; |
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struct property *prop; |
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const __be32 *val = NULL; |
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__be32 energy_quirk[4]; |
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int num; |
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u32 site, position, dcc; |
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int i; |
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err = vexpress_config_get_topo(dev->of_node, &site, |
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&position, &dcc); |
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if (err) |
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return ERR_PTR(err); |
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prop = of_find_property(dev->of_node, |
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"arm,vexpress-sysreg,func", NULL); |
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if (!prop) |
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return ERR_PTR(-EINVAL); |
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num = prop->length / sizeof(u32) / 2; |
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val = prop->value; |
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/* |
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* "arm,vexpress-energy" function used to be described |
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* by its first device only, now it requires both |
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*/ |
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if (num == 1 && of_device_is_compatible(dev->of_node, |
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"arm,vexpress-energy")) { |
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num = 2; |
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energy_quirk[0] = *val; |
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energy_quirk[2] = *val++; |
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energy_quirk[1] = *val; |
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energy_quirk[3] = cpu_to_be32(be32_to_cpup(val) + 1); |
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val = energy_quirk; |
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} |
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func = kzalloc(struct_size(func, template, num), GFP_KERNEL); |
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if (!func) |
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return ERR_PTR(-ENOMEM); |
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func->syscfg = syscfg; |
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func->num_templates = num; |
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for (i = 0; i < num; i++) { |
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u32 function, device; |
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function = be32_to_cpup(val++); |
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device = be32_to_cpup(val++); |
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dev_dbg(dev, "func %p: %u/%u/%u/%u/%u\n", |
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func, site, position, dcc, |
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function, device); |
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func->template[i] = SYS_CFGCTRL_DCC(dcc); |
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func->template[i] |= SYS_CFGCTRL_SITE(site); |
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func->template[i] |= SYS_CFGCTRL_POSITION(position); |
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func->template[i] |= SYS_CFGCTRL_FUNC(function); |
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func->template[i] |= SYS_CFGCTRL_DEVICE(device); |
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} |
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vexpress_syscfg_regmap_config.max_register = num - 1; |
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func->regmap = regmap_init(dev, NULL, func, |
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&vexpress_syscfg_regmap_config); |
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if (IS_ERR(func->regmap)) { |
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void *err = func->regmap; |
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kfree(func); |
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return err; |
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} |
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list_add(&func->list, &syscfg->funcs); |
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return func->regmap; |
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} |
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static void vexpress_syscfg_regmap_exit(struct regmap *regmap, void *context) |
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{ |
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struct vexpress_syscfg *syscfg = context; |
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struct vexpress_syscfg_func *func, *tmp; |
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regmap_exit(regmap); |
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list_for_each_entry_safe(func, tmp, &syscfg->funcs, list) { |
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if (func->regmap == regmap) { |
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list_del(&syscfg->funcs); |
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kfree(func); |
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break; |
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} |
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} |
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} |
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static struct vexpress_config_bridge_ops vexpress_syscfg_bridge_ops = { |
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.regmap_init = vexpress_syscfg_regmap_init, |
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.regmap_exit = vexpress_syscfg_regmap_exit, |
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}; |
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static int vexpress_syscfg_probe(struct platform_device *pdev) |
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{ |
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struct vexpress_syscfg *syscfg; |
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struct resource *res; |
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struct vexpress_config_bridge *bridge; |
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struct device_node *node; |
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int master; |
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u32 dt_hbi; |
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syscfg = devm_kzalloc(&pdev->dev, sizeof(*syscfg), GFP_KERNEL); |
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if (!syscfg) |
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return -ENOMEM; |
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syscfg->dev = &pdev->dev; |
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INIT_LIST_HEAD(&syscfg->funcs); |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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syscfg->base = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(syscfg->base)) |
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return PTR_ERR(syscfg->base); |
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bridge = devm_kmalloc(&pdev->dev, sizeof(*bridge), GFP_KERNEL); |
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if (!bridge) |
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return -ENOMEM; |
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bridge->ops = &vexpress_syscfg_bridge_ops; |
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bridge->context = syscfg; |
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dev_set_drvdata(&pdev->dev, bridge); |
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master = readl(syscfg->base + SYS_MISC) & SYS_MISC_MASTERSITE ? |
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VEXPRESS_SITE_DB2 : VEXPRESS_SITE_DB1; |
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vexpress_config_set_master(master); |
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/* Confirm board type against DT property, if available */ |
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if (of_property_read_u32(of_root, "arm,hbi", &dt_hbi) == 0) { |
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u32 id = readl(syscfg->base + (master == VEXPRESS_SITE_DB1 ? |
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SYS_PROCID0 : SYS_PROCID1)); |
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u32 hbi = (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK; |
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if (WARN_ON(dt_hbi != hbi)) |
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dev_warn(&pdev->dev, "DT HBI (%x) is not matching hardware (%x)!\n", |
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dt_hbi, hbi); |
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} |
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for_each_compatible_node(node, NULL, "arm,vexpress,config-bus") { |
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struct device_node *bridge_np; |
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bridge_np = of_parse_phandle(node, "arm,vexpress,config-bridge", 0); |
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if (bridge_np != pdev->dev.parent->of_node) |
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continue; |
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of_platform_populate(node, NULL, NULL, &pdev->dev); |
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} |
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return 0; |
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} |
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static const struct platform_device_id vexpress_syscfg_id_table[] = { |
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{ "vexpress-syscfg", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(platform, vexpress_syscfg_id_table); |
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static struct platform_driver vexpress_syscfg_driver = { |
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.driver.name = "vexpress-syscfg", |
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.id_table = vexpress_syscfg_id_table, |
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.probe = vexpress_syscfg_probe, |
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}; |
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module_platform_driver(vexpress_syscfg_driver); |
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MODULE_LICENSE("GPL v2");
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