--- /dev/null
+/*
+ * Copyright (c) 2017
+ * Patrice Chotard <patrice.chotard@st.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <wait_bit.h>
+#include <dm.h>
+#include <reset-uclass.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <dt-bindings/reset/stih407-resets.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct sti_reset {
+ const struct syscfg_reset_controller_data *data;
+};
+
+/**
+ * Reset channel description for a system configuration register based
+ * reset controller.
+ *
+ * @compatible: Compatible string of the syscon containing this
+ * channel's control and ack (status) bits.
+ * @reset_offset: Reset register offset in sysconf bank.
+ * @reset_bit: Bit number in reset register.
+ * @ack_offset: Ack reset register offset in syscon bank.
+ * @ack_bit: Bit number in Ack reset register.
+ */
+
+struct syscfg_reset_channel_data {
+ const char *compatible;
+ int reset_offset;
+ int reset_bit;
+ int ack_offset;
+ int ack_bit;
+};
+
+/**
+ * Description of a system configuration register based reset controller.
+ *
+ * @wait_for_ack: The controller will wait for reset assert and de-assert to
+ * be "ack'd" in a channel's ack field.
+ * @active_low: Are the resets in this controller active low, i.e. clearing
+ * the reset bit puts the hardware into reset.
+ * @nr_channels: The number of reset channels in this controller.
+ * @channels: An array of reset channel descriptions.
+ */
+struct syscfg_reset_controller_data {
+ bool wait_for_ack;
+ bool active_low;
+ int nr_channels;
+ const struct syscfg_reset_channel_data *channels;
+};
+
+/* STiH407 Peripheral powerdown definitions. */
+static const char stih407_core[] = "st,stih407-core-syscfg";
+static const char stih407_sbc_reg[] = "st,stih407-sbc-reg-syscfg";
+static const char stih407_lpm[] = "st,stih407-lpm-syscfg";
+
+#define _SYSCFG_RST_CH(_c, _rr, _rb, _ar, _ab) \
+ { .compatible = _c, \
+ .reset_offset = _rr, \
+ .reset_bit = _rb, \
+ .ack_offset = _ar, \
+ .ack_bit = _ab, }
+
+#define _SYSCFG_RST_CH_NO_ACK(_c, _rr, _rb) \
+ { .compatible = _c, \
+ .reset_offset = _rr, \
+ .reset_bit = _rb, }
+
+#define STIH407_SRST_CORE(_reg, _bit) \
+ _SYSCFG_RST_CH_NO_ACK(stih407_core, _reg, _bit)
+
+#define STIH407_SRST_SBC(_reg, _bit) \
+ _SYSCFG_RST_CH_NO_ACK(stih407_sbc_reg, _reg, _bit)
+
+#define STIH407_SRST_LPM(_reg, _bit) \
+ _SYSCFG_RST_CH_NO_ACK(stih407_lpm, _reg, _bit)
+
+#define STIH407_PDN_0(_bit) \
+ _SYSCFG_RST_CH(stih407_core, SYSCFG_5000, _bit, SYSSTAT_5500, _bit)
+#define STIH407_PDN_1(_bit) \
+ _SYSCFG_RST_CH(stih407_core, SYSCFG_5001, _bit, SYSSTAT_5501, _bit)
+#define STIH407_PDN_ETH(_bit, _stat) \
+ _SYSCFG_RST_CH(stih407_sbc_reg, SYSCFG_4032, _bit, SYSSTAT_4520, _stat)
+
+/* Powerdown requests control 0 */
+#define SYSCFG_5000 0x0
+#define SYSSTAT_5500 0x7d0
+/* Powerdown requests control 1 (High Speed Links) */
+#define SYSCFG_5001 0x4
+#define SYSSTAT_5501 0x7d4
+
+/* Ethernet powerdown/status/reset */
+#define SYSCFG_4032 0x80
+#define SYSSTAT_4520 0x820
+#define SYSCFG_4002 0x8
+
+static const struct syscfg_reset_channel_data stih407_powerdowns[] = {
+ [STIH407_EMISS_POWERDOWN] = STIH407_PDN_0(1),
+ [STIH407_NAND_POWERDOWN] = STIH407_PDN_0(0),
+ [STIH407_USB3_POWERDOWN] = STIH407_PDN_1(6),
+ [STIH407_USB2_PORT1_POWERDOWN] = STIH407_PDN_1(5),
+ [STIH407_USB2_PORT0_POWERDOWN] = STIH407_PDN_1(4),
+ [STIH407_PCIE1_POWERDOWN] = STIH407_PDN_1(3),
+ [STIH407_PCIE0_POWERDOWN] = STIH407_PDN_1(2),
+ [STIH407_SATA1_POWERDOWN] = STIH407_PDN_1(1),
+ [STIH407_SATA0_POWERDOWN] = STIH407_PDN_1(0),
+ [STIH407_ETH1_POWERDOWN] = STIH407_PDN_ETH(0, 2),
+};
+
+/* Reset Generator control 0/1 */
+#define SYSCFG_5128 0x200
+#define SYSCFG_5131 0x20c
+#define SYSCFG_5132 0x210
+
+#define LPM_SYSCFG_1 0x4 /* Softreset IRB & SBC UART */
+
+static const struct syscfg_reset_channel_data stih407_softresets[] = {
+ [STIH407_ETH1_SOFTRESET] = STIH407_SRST_SBC(SYSCFG_4002, 4),
+ [STIH407_MMC1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 3),
+ [STIH407_USB2_PORT0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 28),
+ [STIH407_USB2_PORT1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 29),
+ [STIH407_PICOPHY_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 30),
+ [STIH407_IRB_SOFTRESET] = STIH407_SRST_LPM(LPM_SYSCFG_1, 6),
+ [STIH407_PCIE0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 6),
+ [STIH407_PCIE1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 15),
+ [STIH407_SATA0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 7),
+ [STIH407_SATA1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 16),
+ [STIH407_MIPHY0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 4),
+ [STIH407_MIPHY1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 13),
+ [STIH407_MIPHY2_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 22),
+ [STIH407_SATA0_PWR_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 5),
+ [STIH407_SATA1_PWR_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 14),
+ [STIH407_DELTA_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 3),
+ [STIH407_BLITTER_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 10),
+ [STIH407_HDTVOUT_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 11),
+ [STIH407_HDQVDP_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 12),
+ [STIH407_VDP_AUX_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 14),
+ [STIH407_COMPO_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 15),
+ [STIH407_HDMI_TX_PHY_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 21),
+ [STIH407_JPEG_DEC_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 23),
+ [STIH407_VP8_DEC_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 24),
+ [STIH407_GPU_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 30),
+ [STIH407_HVA_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 0),
+ [STIH407_ERAM_HVA_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 1),
+ [STIH407_LPM_SOFTRESET] = STIH407_SRST_SBC(SYSCFG_4002, 2),
+ [STIH407_KEYSCAN_SOFTRESET] = STIH407_SRST_LPM(LPM_SYSCFG_1, 8),
+ [STIH407_ST231_AUD_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 26),
+ [STIH407_ST231_DMU_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 27),
+ [STIH407_ST231_GP0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 28),
+ [STIH407_ST231_GP1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5128, 2),
+};
+
+/* PicoPHY reset/control */
+#define SYSCFG_5061 0x0f4
+
+static const struct syscfg_reset_channel_data stih407_picophyresets[] = {
+ [STIH407_PICOPHY0_RESET] = STIH407_SRST_CORE(SYSCFG_5061, 5),
+ [STIH407_PICOPHY1_RESET] = STIH407_SRST_CORE(SYSCFG_5061, 6),
+ [STIH407_PICOPHY2_RESET] = STIH407_SRST_CORE(SYSCFG_5061, 7),
+};
+
+static const struct
+syscfg_reset_controller_data stih407_powerdown_controller = {
+ .wait_for_ack = true,
+ .nr_channels = ARRAY_SIZE(stih407_powerdowns),
+ .channels = stih407_powerdowns,
+};
+
+static const struct
+syscfg_reset_controller_data stih407_softreset_controller = {
+ .wait_for_ack = false,
+ .active_low = true,
+ .nr_channels = ARRAY_SIZE(stih407_softresets),
+ .channels = stih407_softresets,
+};
+
+static const struct
+syscfg_reset_controller_data stih407_picophyreset_controller = {
+ .wait_for_ack = false,
+ .nr_channels = ARRAY_SIZE(stih407_picophyresets),
+ .channels = stih407_picophyresets,
+};
+
+phys_addr_t sti_reset_get_regmap(const char *compatible)
+{
+ struct udevice *syscon;
+ struct regmap *regmap;
+ int node, ret;
+
+ node = fdt_node_offset_by_compatible(gd->fdt_blob, -1,
+ compatible);
+ if (node < 0) {
+ error("unable to find %s node\n", compatible);
+ return node;
+ }
+
+ ret = uclass_get_device_by_of_offset(UCLASS_SYSCON, node, &syscon);
+ if (ret) {
+ error("%s: uclass_get_device_by_of_offset failed: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ regmap = syscon_get_regmap(syscon);
+ if (!regmap) {
+ error("unable to get regmap for %s\n", syscon->name);
+ return -ENODEV;
+ }
+
+ return regmap->base;
+}
+
+static int sti_reset_program_hw(struct reset_ctl *reset_ctl, int assert)
+{
+ struct udevice *dev = reset_ctl->dev;
+ struct syscfg_reset_controller_data *reset_desc =
+ (struct syscfg_reset_controller_data *)(dev->driver_data);
+ struct syscfg_reset_channel_data ch;
+ phys_addr_t base;
+ u32 ctrl_val = reset_desc->active_low ? !assert : !!assert;
+ void __iomem *reg;
+
+ /* check if reset id is inside available range */
+ if (reset_ctl->id >= reset_desc->nr_channels)
+ return -EINVAL;
+
+ /* get reset sysconf register base address */
+ base = sti_reset_get_regmap(reset_desc->channels[reset_ctl->id].compatible);
+
+ ch = reset_desc->channels[reset_ctl->id];
+ reg = (void __iomem *)base + ch.reset_offset;
+
+ if (ctrl_val)
+ generic_set_bit(ch.reset_bit, reg);
+ else
+ generic_clear_bit(ch.reset_bit, reg);
+
+ if (!reset_desc->wait_for_ack)
+ return 0;
+
+ reg = (void __iomem *)base + ch.ack_offset;
+ if (wait_for_bit(__func__, reg, BIT(ch.ack_bit), ctrl_val,
+ 1000, false)) {
+ error("Stuck on waiting ack reset_ctl=%p dev=%p id=%lu\n",
+ reset_ctl, reset_ctl->dev, reset_ctl->id);
+
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static int sti_reset_request(struct reset_ctl *reset_ctl)
+{
+ return 0;
+}
+
+static int sti_reset_free(struct reset_ctl *reset_ctl)
+{
+ return 0;
+}
+
+static int sti_reset_assert(struct reset_ctl *reset_ctl)
+{
+ return sti_reset_program_hw(reset_ctl, true);
+}
+
+static int sti_reset_deassert(struct reset_ctl *reset_ctl)
+{
+ return sti_reset_program_hw(reset_ctl, false);
+}
+
+struct reset_ops sti_reset_ops = {
+ .request = sti_reset_request,
+ .free = sti_reset_free,
+ .rst_assert = sti_reset_assert,
+ .rst_deassert = sti_reset_deassert,
+};
+
+static int sti_reset_probe(struct udevice *dev)
+{
+ struct sti_reset *priv = dev_get_priv(dev);
+
+ priv->data = (void *)dev_get_driver_data(dev);
+
+ return 0;
+}
+
+static const struct udevice_id sti_reset_ids[] = {
+ {
+ .compatible = "st,stih407-picophyreset",
+ .data = (ulong)&stih407_picophyreset_controller,
+ },
+ {
+ .compatible = "st,stih407-powerdown",
+ .data = (ulong)&stih407_powerdown_controller,
+ },
+ {
+ .compatible = "st,stih407-softreset",
+ .data = (ulong)&stih407_softreset_controller,
+ },
+ { }
+};
+
+U_BOOT_DRIVER(sti_reset) = {
+ .name = "sti_reset",
+ .id = UCLASS_RESET,
+ .of_match = sti_reset_ids,
+ .probe = sti_reset_probe,
+ .priv_auto_alloc_size = sizeof(struct sti_reset),
+ .ops = &sti_reset_ops,
+};
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