xref: /linux/drivers/net/wwan/t7xx/t7xx_pcie_mac.c (revision 6c8c1406a6d6a3f2e61ac590f5c0994231bc6be7) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2021, MediaTek Inc.
4  * Copyright (c) 2021-2022, Intel Corporation.
5  *
6  * Authors:
7  *  Haijun Liu <haijun.liu@mediatek.com>
8  *  Moises Veleta <moises.veleta@intel.com>
9  *  Sreehari Kancharla <sreehari.kancharla@intel.com>
10  *
11  * Contributors:
12  *  Amir Hanania <amir.hanania@intel.com>
13  *  Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
14  *  Ricardo Martinez <ricardo.martinez@linux.intel.com>
15  */
16 
17 #include <linux/bits.h>
18 #include <linux/bitops.h>
19 #include <linux/device.h>
20 #include <linux/io-64-nonatomic-lo-hi.h>
21 #include <linux/pci.h>
22 #include <linux/string.h>
23 #include <linux/types.h>
24 
25 #include "t7xx_pci.h"
26 #include "t7xx_pcie_mac.h"
27 #include "t7xx_reg.h"
28 
29 #define T7XX_PCIE_REG_BAR		2
30 #define T7XX_PCIE_REG_PORT		ATR_SRC_PCI_WIN0
31 #define T7XX_PCIE_REG_TABLE_NUM		0
32 #define T7XX_PCIE_REG_TRSL_PORT		ATR_DST_AXIM_0
33 
34 #define T7XX_PCIE_DEV_DMA_PORT_START	ATR_SRC_AXIS_0
35 #define T7XX_PCIE_DEV_DMA_PORT_END	ATR_SRC_AXIS_2
36 #define T7XX_PCIE_DEV_DMA_TABLE_NUM	0
37 #define T7XX_PCIE_DEV_DMA_TRSL_ADDR	0
38 #define T7XX_PCIE_DEV_DMA_SRC_ADDR	0
39 #define T7XX_PCIE_DEV_DMA_TRANSPARENT	1
40 #define T7XX_PCIE_DEV_DMA_SIZE		0
41 
42 enum t7xx_atr_src_port {
43 	ATR_SRC_PCI_WIN0,
44 	ATR_SRC_PCI_WIN1,
45 	ATR_SRC_AXIS_0,
46 	ATR_SRC_AXIS_1,
47 	ATR_SRC_AXIS_2,
48 	ATR_SRC_AXIS_3,
49 };
50 
51 enum t7xx_atr_dst_port {
52 	ATR_DST_PCI_TRX,
53 	ATR_DST_PCI_CONFIG,
54 	ATR_DST_AXIM_0 = 4,
55 	ATR_DST_AXIM_1,
56 	ATR_DST_AXIM_2,
57 	ATR_DST_AXIM_3,
58 };
59 
60 struct t7xx_atr_config {
61 	u64			src_addr;
62 	u64			trsl_addr;
63 	u64			size;
64 	u32			port;
65 	u32			table;
66 	enum t7xx_atr_dst_port	trsl_id;
67 	u32			transparent;
68 };
69 
70 static void t7xx_pcie_mac_atr_tables_dis(void __iomem *pbase, enum t7xx_atr_src_port port)
71 {
72 	void __iomem *reg;
73 	int i, offset;
74 
75 	for (i = 0; i < ATR_TABLE_NUM_PER_ATR; i++) {
76 		offset = ATR_PORT_OFFSET * port + ATR_TABLE_OFFSET * i;
77 		reg = pbase + ATR_PCIE_WIN0_T0_ATR_PARAM_SRC_ADDR + offset;
78 		iowrite64(0, reg);
79 	}
80 }
81 
82 static int t7xx_pcie_mac_atr_cfg(struct t7xx_pci_dev *t7xx_dev, struct t7xx_atr_config *cfg)
83 {
84 	struct device *dev = &t7xx_dev->pdev->dev;
85 	void __iomem *pbase = IREG_BASE(t7xx_dev);
86 	int atr_size, pos, offset;
87 	void __iomem *reg;
88 	u64 value;
89 
90 	if (cfg->transparent) {
91 		/* No address conversion is performed */
92 		atr_size = ATR_TRANSPARENT_SIZE;
93 	} else {
94 		if (cfg->src_addr & (cfg->size - 1)) {
95 			dev_err(dev, "Source address is not aligned to size\n");
96 			return -EINVAL;
97 		}
98 
99 		if (cfg->trsl_addr & (cfg->size - 1)) {
100 			dev_err(dev, "Translation address %llx is not aligned to size %llx\n",
101 				cfg->trsl_addr, cfg->size - 1);
102 			return -EINVAL;
103 		}
104 
105 		pos = __ffs64(cfg->size);
106 
107 		/* HW calculates the address translation space as 2^(atr_size + 1) */
108 		atr_size = pos - 1;
109 	}
110 
111 	offset = ATR_PORT_OFFSET * cfg->port + ATR_TABLE_OFFSET * cfg->table;
112 
113 	reg = pbase + ATR_PCIE_WIN0_T0_TRSL_ADDR + offset;
114 	value = cfg->trsl_addr & ATR_PCIE_WIN0_ADDR_ALGMT;
115 	iowrite64(value, reg);
116 
117 	reg = pbase + ATR_PCIE_WIN0_T0_TRSL_PARAM + offset;
118 	iowrite32(cfg->trsl_id, reg);
119 
120 	reg = pbase + ATR_PCIE_WIN0_T0_ATR_PARAM_SRC_ADDR + offset;
121 	value = (cfg->src_addr & ATR_PCIE_WIN0_ADDR_ALGMT) | (atr_size << 1) | BIT(0);
122 	iowrite64(value, reg);
123 
124 	/* Ensure ATR is set */
125 	ioread64(reg);
126 	return 0;
127 }
128 
129 /**
130  * t7xx_pcie_mac_atr_init() - Initialize address translation.
131  * @t7xx_dev: MTK device.
132  *
133  * Setup ATR for ports & device.
134  */
135 void t7xx_pcie_mac_atr_init(struct t7xx_pci_dev *t7xx_dev)
136 {
137 	struct t7xx_atr_config cfg;
138 	u32 i;
139 
140 	/* Disable for all ports */
141 	for (i = ATR_SRC_PCI_WIN0; i <= ATR_SRC_AXIS_3; i++)
142 		t7xx_pcie_mac_atr_tables_dis(IREG_BASE(t7xx_dev), i);
143 
144 	memset(&cfg, 0, sizeof(cfg));
145 	/* Config ATR for RC to access device's register */
146 	cfg.src_addr = pci_resource_start(t7xx_dev->pdev, T7XX_PCIE_REG_BAR);
147 	cfg.size = T7XX_PCIE_REG_SIZE_CHIP;
148 	cfg.trsl_addr = T7XX_PCIE_REG_TRSL_ADDR_CHIP;
149 	cfg.port = T7XX_PCIE_REG_PORT;
150 	cfg.table = T7XX_PCIE_REG_TABLE_NUM;
151 	cfg.trsl_id = T7XX_PCIE_REG_TRSL_PORT;
152 	t7xx_pcie_mac_atr_tables_dis(IREG_BASE(t7xx_dev), cfg.port);
153 	t7xx_pcie_mac_atr_cfg(t7xx_dev, &cfg);
154 
155 	t7xx_dev->base_addr.pcie_dev_reg_trsl_addr = T7XX_PCIE_REG_TRSL_ADDR_CHIP;
156 
157 	/* Config ATR for EP to access RC's memory */
158 	for (i = T7XX_PCIE_DEV_DMA_PORT_START; i <= T7XX_PCIE_DEV_DMA_PORT_END; i++) {
159 		cfg.src_addr = T7XX_PCIE_DEV_DMA_SRC_ADDR;
160 		cfg.size = T7XX_PCIE_DEV_DMA_SIZE;
161 		cfg.trsl_addr = T7XX_PCIE_DEV_DMA_TRSL_ADDR;
162 		cfg.port = i;
163 		cfg.table = T7XX_PCIE_DEV_DMA_TABLE_NUM;
164 		cfg.trsl_id = ATR_DST_PCI_TRX;
165 		cfg.transparent = T7XX_PCIE_DEV_DMA_TRANSPARENT;
166 		t7xx_pcie_mac_atr_tables_dis(IREG_BASE(t7xx_dev), cfg.port);
167 		t7xx_pcie_mac_atr_cfg(t7xx_dev, &cfg);
168 	}
169 }
170 
171 /**
172  * t7xx_pcie_mac_enable_disable_int() - Enable/disable interrupts.
173  * @t7xx_dev: MTK device.
174  * @enable: Enable/disable.
175  *
176  * Enable or disable device interrupts.
177  */
178 static void t7xx_pcie_mac_enable_disable_int(struct t7xx_pci_dev *t7xx_dev, bool enable)
179 {
180 	u32 value;
181 
182 	value = ioread32(IREG_BASE(t7xx_dev) + ISTAT_HST_CTRL);
183 
184 	if (enable)
185 		value &= ~ISTAT_HST_CTRL_DIS;
186 	else
187 		value |= ISTAT_HST_CTRL_DIS;
188 
189 	iowrite32(value, IREG_BASE(t7xx_dev) + ISTAT_HST_CTRL);
190 }
191 
192 void t7xx_pcie_mac_interrupts_en(struct t7xx_pci_dev *t7xx_dev)
193 {
194 	t7xx_pcie_mac_enable_disable_int(t7xx_dev, true);
195 }
196 
197 void t7xx_pcie_mac_interrupts_dis(struct t7xx_pci_dev *t7xx_dev)
198 {
199 	t7xx_pcie_mac_enable_disable_int(t7xx_dev, false);
200 }
201 
202 /**
203  * t7xx_pcie_mac_clear_set_int() - Clear/set interrupt by type.
204  * @t7xx_dev: MTK device.
205  * @int_type: Interrupt type.
206  * @clear: Clear/set.
207  *
208  * Clear or set device interrupt by type.
209  */
210 static void t7xx_pcie_mac_clear_set_int(struct t7xx_pci_dev *t7xx_dev,
211 					enum t7xx_int int_type, bool clear)
212 {
213 	void __iomem *reg;
214 	u32 val;
215 
216 	if (clear)
217 		reg = IREG_BASE(t7xx_dev) + IMASK_HOST_MSIX_CLR_GRP0_0;
218 	else
219 		reg = IREG_BASE(t7xx_dev) + IMASK_HOST_MSIX_SET_GRP0_0;
220 
221 	val = BIT(EXT_INT_START + int_type);
222 	iowrite32(val, reg);
223 }
224 
225 void t7xx_pcie_mac_clear_int(struct t7xx_pci_dev *t7xx_dev, enum t7xx_int int_type)
226 {
227 	t7xx_pcie_mac_clear_set_int(t7xx_dev, int_type, true);
228 }
229 
230 void t7xx_pcie_mac_set_int(struct t7xx_pci_dev *t7xx_dev, enum t7xx_int int_type)
231 {
232 	t7xx_pcie_mac_clear_set_int(t7xx_dev, int_type, false);
233 }
234 
235 /**
236  * t7xx_pcie_mac_clear_int_status() - Clear interrupt status by type.
237  * @t7xx_dev: MTK device.
238  * @int_type: Interrupt type.
239  *
240  * Enable or disable device interrupts' status by type.
241  */
242 void t7xx_pcie_mac_clear_int_status(struct t7xx_pci_dev *t7xx_dev, enum t7xx_int int_type)
243 {
244 	void __iomem *reg = IREG_BASE(t7xx_dev) + MSIX_ISTAT_HST_GRP0_0;
245 	u32 val = BIT(EXT_INT_START + int_type);
246 
247 	iowrite32(val, reg);
248 }
249 
250 /**
251  * t7xx_pcie_set_mac_msix_cfg() - Write MSIX control configuration.
252  * @t7xx_dev: MTK device.
253  * @irq_count: Number of MSIX IRQ vectors.
254  *
255  * Write IRQ count to device.
256  */
257 void t7xx_pcie_set_mac_msix_cfg(struct t7xx_pci_dev *t7xx_dev, unsigned int irq_count)
258 {
259 	u32 val = ffs(irq_count) * 2 - 1;
260 
261 	iowrite32(val, IREG_BASE(t7xx_dev) + T7XX_PCIE_CFG_MSIX);
262 }
263