^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2014 ARM Limited
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/vexpress.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define SYS_MISC 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define SYS_MISC_MASTERSITE (1 << 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define SYS_PROCID0 0x24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define SYS_PROCID1 0x28
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define SYS_HBI_MASK 0xfff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define SYS_PROCIDx_HBI_SHIFT 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define SYS_CFGDATA 0x40
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define SYS_CFGCTRL 0x44
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define SYS_CFGCTRL_START (1 << 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define SYS_CFGCTRL_WRITE (1 << 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define SYS_CFGCTRL_DCC(n) (((n) & 0xf) << 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define SYS_CFGCTRL_FUNC(n) (((n) & 0x3f) << 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define SYS_CFGCTRL_SITE(n) (((n) & 0x3) << 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define SYS_CFGCTRL_POSITION(n) (((n) & 0xf) << 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define SYS_CFGCTRL_DEVICE(n) (((n) & 0xfff) << 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define SYS_CFGSTAT 0x48
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define SYS_CFGSTAT_ERR (1 << 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define SYS_CFGSTAT_COMPLETE (1 << 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define VEXPRESS_SITE_MB 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define VEXPRESS_SITE_DB1 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define VEXPRESS_SITE_DB2 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #define VEXPRESS_SITE_MASTER 0xf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct vexpress_syscfg {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct list_head funcs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct vexpress_syscfg_func {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct vexpress_syscfg *syscfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) int num_templates;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) u32 template[]; /* Keep it last! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct vexpress_config_bridge_ops {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct regmap * (*regmap_init)(struct device *dev, void *context);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) void (*regmap_exit)(struct regmap *regmap, void *context);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct vexpress_config_bridge {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct vexpress_config_bridge_ops *ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) void *context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static DEFINE_MUTEX(vexpress_config_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static u32 vexpress_config_site_master = VEXPRESS_SITE_MASTER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static void vexpress_config_set_master(u32 site)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) vexpress_config_site_master = site;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static void vexpress_config_lock(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) mutex_lock(&vexpress_config_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static void vexpress_config_unlock(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) mutex_unlock(&vexpress_config_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static void vexpress_config_find_prop(struct device_node *node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) const char *name, u32 *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /* Default value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) *val = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) of_node_get(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) while (node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (of_property_read_u32(node, name, val) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) of_node_put(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) node = of_get_next_parent(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static int vexpress_config_get_topo(struct device_node *node, u32 *site,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) u32 *position, u32 *dcc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) vexpress_config_find_prop(node, "arm,vexpress,site", site);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (*site == VEXPRESS_SITE_MASTER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) *site = vexpress_config_site_master;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (WARN_ON(vexpress_config_site_master == VEXPRESS_SITE_MASTER))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) vexpress_config_find_prop(node, "arm,vexpress,position", position);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) vexpress_config_find_prop(node, "arm,vexpress,dcc", dcc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static void vexpress_config_devres_release(struct device *dev, void *res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct vexpress_config_bridge *bridge = dev_get_drvdata(dev->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct regmap *regmap = res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) bridge->ops->regmap_exit(regmap, bridge->context);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct regmap *devm_regmap_init_vexpress_config(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct vexpress_config_bridge *bridge;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct regmap *regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) struct regmap **res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) bridge = dev_get_drvdata(dev->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (WARN_ON(!bridge))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) res = devres_alloc(vexpress_config_devres_release, sizeof(*res),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (!res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) regmap = (bridge->ops->regmap_init)(dev, bridge->context);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (IS_ERR(regmap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) devres_free(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) *res = regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) devres_add(dev, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) EXPORT_SYMBOL_GPL(devm_regmap_init_vexpress_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static int vexpress_syscfg_exec(struct vexpress_syscfg_func *func,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) int index, bool write, u32 *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) struct vexpress_syscfg *syscfg = func->syscfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) u32 command, status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) int tries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) long timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (WARN_ON(index >= func->num_templates))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) command = readl(syscfg->base + SYS_CFGCTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (WARN_ON(command & SYS_CFGCTRL_START))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) command = func->template[index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) command |= SYS_CFGCTRL_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) command |= write ? SYS_CFGCTRL_WRITE : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) /* Use a canary for reads */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (!write)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) *data = 0xdeadbeef;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) dev_dbg(syscfg->dev, "func %p, command %x, data %x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) func, command, *data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) writel(*data, syscfg->base + SYS_CFGDATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) writel(0, syscfg->base + SYS_CFGSTAT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) writel(command, syscfg->base + SYS_CFGCTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /* The operation can take ages... Go to sleep, 100us initially */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) tries = 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) timeout = 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) if (!irqs_disabled()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) set_current_state(TASK_INTERRUPTIBLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) schedule_timeout(usecs_to_jiffies(timeout));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (signal_pending(current))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) return -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) udelay(timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) status = readl(syscfg->base + SYS_CFGSTAT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (status & SYS_CFGSTAT_ERR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if (timeout > 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) timeout -= 20;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) } while (--tries && !(status & SYS_CFGSTAT_COMPLETE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (WARN_ON_ONCE(!tries))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return -ETIMEDOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (!write) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) *data = readl(syscfg->base + SYS_CFGDATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) dev_dbg(syscfg->dev, "func %p, read data %x\n", func, *data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) static int vexpress_syscfg_read(void *context, unsigned int index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) unsigned int *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) struct vexpress_syscfg_func *func = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) return vexpress_syscfg_exec(func, index, false, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) static int vexpress_syscfg_write(void *context, unsigned int index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) unsigned int val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) struct vexpress_syscfg_func *func = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return vexpress_syscfg_exec(func, index, true, &val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static struct regmap_config vexpress_syscfg_regmap_config = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) .lock = vexpress_config_lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) .unlock = vexpress_config_unlock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) .reg_bits = 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) .val_bits = 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) .reg_read = vexpress_syscfg_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) .reg_write = vexpress_syscfg_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) .reg_format_endian = REGMAP_ENDIAN_LITTLE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) .val_format_endian = REGMAP_ENDIAN_LITTLE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) static struct regmap *vexpress_syscfg_regmap_init(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) struct vexpress_syscfg *syscfg = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) struct vexpress_syscfg_func *func;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) struct property *prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) const __be32 *val = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) __be32 energy_quirk[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) int num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) u32 site, position, dcc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) err = vexpress_config_get_topo(dev->of_node, &site,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) &position, &dcc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) prop = of_find_property(dev->of_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) "arm,vexpress-sysreg,func", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (!prop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) num = prop->length / sizeof(u32) / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) val = prop->value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * "arm,vexpress-energy" function used to be described
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) * by its first device only, now it requires both
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (num == 1 && of_device_is_compatible(dev->of_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) "arm,vexpress-energy")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) num = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) energy_quirk[0] = *val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) energy_quirk[2] = *val++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) energy_quirk[1] = *val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) energy_quirk[3] = cpu_to_be32(be32_to_cpup(val) + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) val = energy_quirk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) func = kzalloc(struct_size(func, template, num), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) if (!func)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) func->syscfg = syscfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) func->num_templates = num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) for (i = 0; i < num; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) u32 function, device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) function = be32_to_cpup(val++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) device = be32_to_cpup(val++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) dev_dbg(dev, "func %p: %u/%u/%u/%u/%u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) func, site, position, dcc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) function, device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) func->template[i] = SYS_CFGCTRL_DCC(dcc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) func->template[i] |= SYS_CFGCTRL_SITE(site);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) func->template[i] |= SYS_CFGCTRL_POSITION(position);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) func->template[i] |= SYS_CFGCTRL_FUNC(function);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) func->template[i] |= SYS_CFGCTRL_DEVICE(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) vexpress_syscfg_regmap_config.max_register = num - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) func->regmap = regmap_init(dev, NULL, func,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) &vexpress_syscfg_regmap_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) if (IS_ERR(func->regmap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) void *err = func->regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) kfree(func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) list_add(&func->list, &syscfg->funcs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) return func->regmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) static void vexpress_syscfg_regmap_exit(struct regmap *regmap, void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) struct vexpress_syscfg *syscfg = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) struct vexpress_syscfg_func *func, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) regmap_exit(regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) list_for_each_entry_safe(func, tmp, &syscfg->funcs, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (func->regmap == regmap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) list_del(&syscfg->funcs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) kfree(func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) static struct vexpress_config_bridge_ops vexpress_syscfg_bridge_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) .regmap_init = vexpress_syscfg_regmap_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) .regmap_exit = vexpress_syscfg_regmap_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) static int vexpress_syscfg_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) struct vexpress_syscfg *syscfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) struct vexpress_config_bridge *bridge;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) struct device_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) int master;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) u32 dt_hbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) syscfg = devm_kzalloc(&pdev->dev, sizeof(*syscfg), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) if (!syscfg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) syscfg->dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) INIT_LIST_HEAD(&syscfg->funcs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) syscfg->base = devm_ioremap_resource(&pdev->dev, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) if (IS_ERR(syscfg->base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) return PTR_ERR(syscfg->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) bridge = devm_kmalloc(&pdev->dev, sizeof(*bridge), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) if (!bridge)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) bridge->ops = &vexpress_syscfg_bridge_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) bridge->context = syscfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) dev_set_drvdata(&pdev->dev, bridge);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) master = readl(syscfg->base + SYS_MISC) & SYS_MISC_MASTERSITE ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) VEXPRESS_SITE_DB2 : VEXPRESS_SITE_DB1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) vexpress_config_set_master(master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) /* Confirm board type against DT property, if available */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) if (of_property_read_u32(of_root, "arm,hbi", &dt_hbi) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) u32 id = readl(syscfg->base + (master == VEXPRESS_SITE_DB1 ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) SYS_PROCID0 : SYS_PROCID1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) u32 hbi = (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (WARN_ON(dt_hbi != hbi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) dev_warn(&pdev->dev, "DT HBI (%x) is not matching hardware (%x)!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) dt_hbi, hbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) for_each_compatible_node(node, NULL, "arm,vexpress,config-bus") {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) struct device_node *bridge_np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) bridge_np = of_parse_phandle(node, "arm,vexpress,config-bridge", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) if (bridge_np != pdev->dev.parent->of_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) of_platform_populate(node, NULL, NULL, &pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) static const struct platform_device_id vexpress_syscfg_id_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) { "vexpress-syscfg", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) MODULE_DEVICE_TABLE(platform, vexpress_syscfg_id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) static struct platform_driver vexpress_syscfg_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) .driver.name = "vexpress-syscfg",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) .id_table = vexpress_syscfg_id_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) .probe = vexpress_syscfg_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) module_platform_driver(vexpress_syscfg_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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