1 // SPDX-License-Identifier: GPL-2.0
3 * MediaTek PCIe host controller driver.
5 * Copyright (c) 2017-2019 MediaTek Inc.
6 * Author: Ryder Lee <ryder.lee@mediatek.com>
7 * Honghui Zhang <honghui.zhang@mediatek.com>
13 #include <generic-phy.h>
19 #include <dm/devres.h>
20 #include <linux/bitops.h>
21 #include <linux/iopoll.h>
22 #include <linux/list.h>
24 /* PCIe shared registers */
25 #define PCIE_SYS_CFG 0x00
26 #define PCIE_INT_ENABLE 0x0c
27 #define PCIE_CFG_ADDR 0x20
28 #define PCIE_CFG_DATA 0x24
30 /* PCIe per port registers */
31 #define PCIE_BAR0_SETUP 0x10
32 #define PCIE_CLASS 0x34
33 #define PCIE_LINK_STATUS 0x50
35 #define PCIE_PORT_INT_EN(x) BIT(20 + (x))
36 #define PCIE_PORT_PERST(x) BIT(1 + (x))
37 #define PCIE_PORT_LINKUP BIT(0)
38 #define PCIE_BAR_MAP_MAX GENMASK(31, 16)
40 #define PCIE_BAR_ENABLE BIT(0)
41 #define PCIE_REVISION_ID BIT(0)
42 #define PCIE_CLASS_CODE (0x60400 << 8)
43 #define PCIE_CONF_REG(regn) (((regn) & GENMASK(7, 2)) | \
44 ((((regn) >> 8) & GENMASK(3, 0)) << 24))
45 #define PCIE_CONF_ADDR(regn, bdf) \
46 (PCIE_CONF_REG(regn) | (bdf))
48 /* MediaTek specific configuration registers */
49 #define PCIE_FTS_NUM 0x70c
50 #define PCIE_FTS_NUM_MASK GENMASK(15, 8)
51 #define PCIE_FTS_NUM_L0(x) ((x) & 0xff << 8)
53 #define PCIE_FC_CREDIT 0x73c
54 #define PCIE_FC_CREDIT_MASK (GENMASK(31, 31) | GENMASK(28, 16))
55 #define PCIE_FC_CREDIT_VAL(x) ((x) << 16)
57 struct mtk_pcie_port {
59 struct list_head list;
60 struct mtk_pcie *pcie;
61 struct reset_ctl reset;
70 struct list_head ports;
73 static int mtk_pcie_config_address(const struct udevice *udev, pci_dev_t bdf,
74 uint offset, void **paddress)
76 struct mtk_pcie *pcie = dev_get_priv(udev);
78 writel(PCIE_CONF_ADDR(offset, bdf), pcie->base + PCIE_CFG_ADDR);
79 *paddress = pcie->base + PCIE_CFG_DATA + (offset & 3);
84 static int mtk_pcie_read_config(const struct udevice *bus, pci_dev_t bdf,
85 uint offset, ulong *valuep,
88 return pci_generic_mmap_read_config(bus, mtk_pcie_config_address,
89 bdf, offset, valuep, size);
92 static int mtk_pcie_write_config(struct udevice *bus, pci_dev_t bdf,
93 uint offset, ulong value,
96 return pci_generic_mmap_write_config(bus, mtk_pcie_config_address,
97 bdf, offset, value, size);
100 static const struct dm_pci_ops mtk_pcie_ops = {
101 .read_config = mtk_pcie_read_config,
102 .write_config = mtk_pcie_write_config,
105 static void mtk_pcie_port_free(struct mtk_pcie_port *port)
107 list_del(&port->list);
111 static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
113 struct mtk_pcie *pcie = port->pcie;
114 u32 slot = PCI_DEV(port->slot << 11);
118 /* assert port PERST_N */
119 setbits_le32(pcie->base + PCIE_SYS_CFG, PCIE_PORT_PERST(port->slot));
120 /* de-assert port PERST_N */
121 clrbits_le32(pcie->base + PCIE_SYS_CFG, PCIE_PORT_PERST(port->slot));
123 /* 100ms timeout value should be enough for Gen1/2 training */
124 err = readl_poll_timeout(port->base + PCIE_LINK_STATUS, val,
125 !!(val & PCIE_PORT_LINKUP), 100000);
129 /* disable interrupt */
130 clrbits_le32(pcie->base + PCIE_INT_ENABLE,
131 PCIE_PORT_INT_EN(port->slot));
133 /* map to all DDR region. We need to set it before cfg operation. */
134 writel(PCIE_BAR_MAP_MAX | PCIE_BAR_ENABLE,
135 port->base + PCIE_BAR0_SETUP);
137 /* configure class code and revision ID */
138 writel(PCIE_CLASS_CODE | PCIE_REVISION_ID, port->base + PCIE_CLASS);
140 /* configure FC credit */
141 writel(PCIE_CONF_ADDR(PCIE_FC_CREDIT, slot),
142 pcie->base + PCIE_CFG_ADDR);
143 clrsetbits_le32(pcie->base + PCIE_CFG_DATA, PCIE_FC_CREDIT_MASK,
144 PCIE_FC_CREDIT_VAL(0x806c));
146 /* configure RC FTS number to 250 when it leaves L0s */
147 writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, slot), pcie->base + PCIE_CFG_ADDR);
148 clrsetbits_le32(pcie->base + PCIE_CFG_DATA, PCIE_FTS_NUM_MASK,
149 PCIE_FTS_NUM_L0(0x50));
154 static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
158 err = clk_enable(&port->sys_ck);
162 err = reset_assert(&port->reset);
166 err = reset_deassert(&port->reset);
170 err = generic_phy_init(&port->phy);
174 err = generic_phy_power_on(&port->phy);
178 if (!mtk_pcie_startup_port(port))
181 pr_err("Port%d link down\n", port->slot);
183 mtk_pcie_port_free(port);
186 static int mtk_pcie_parse_port(struct udevice *dev, u32 slot)
188 struct mtk_pcie *pcie = dev_get_priv(dev);
189 struct mtk_pcie_port *port;
193 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
197 snprintf(name, sizeof(name), "port%d", slot);
198 port->base = dev_remap_addr_name(dev, name);
202 snprintf(name, sizeof(name), "sys_ck%d", slot);
203 err = clk_get_by_name(dev, name, &port->sys_ck);
207 err = reset_get_by_index(dev, slot, &port->reset);
211 err = generic_phy_get_by_index(dev, slot, &port->phy);
218 INIT_LIST_HEAD(&port->list);
219 list_add_tail(&port->list, &pcie->ports);
224 static int mtk_pcie_probe(struct udevice *dev)
226 struct mtk_pcie *pcie = dev_get_priv(dev);
227 struct mtk_pcie_port *port, *tmp;
231 INIT_LIST_HEAD(&pcie->ports);
233 pcie->base = dev_remap_addr_name(dev, "subsys");
237 err = clk_get_by_name(dev, "free_ck", &pcie->free_ck);
241 /* enable top level clock */
242 err = clk_enable(&pcie->free_ck);
246 dev_for_each_subnode(subnode, dev) {
247 struct fdt_pci_addr addr;
250 if (!ofnode_is_available(subnode))
253 err = ofnode_read_pci_addr(subnode, 0, "reg", &addr);
257 slot = PCI_DEV(addr.phys_hi);
259 err = mtk_pcie_parse_port(dev, slot);
264 /* enable each port, and then check link status */
265 list_for_each_entry_safe(port, tmp, &pcie->ports, list)
266 mtk_pcie_enable_port(port);
271 static const struct udevice_id mtk_pcie_ids[] = {
272 { .compatible = "mediatek,mt7623-pcie", },
276 U_BOOT_DRIVER(pcie_mediatek) = {
277 .name = "pcie_mediatek",
279 .of_match = mtk_pcie_ids,
280 .ops = &mtk_pcie_ops,
281 .probe = mtk_pcie_probe,
282 .priv_auto_alloc_size = sizeof(struct mtk_pcie),