1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Driver for the Aardvark PCIe controller, used on Marvell Armada
4 * 3700.
5 *
6 * Copyright (C) 2016 Marvell
7 *
8 * Author: Hezi Shahmoon <hezi.shahmoon@marvell.com>
9 */
10
11 #include <linux/delay.h>
12 #include <linux/interrupt.h>
13 #include <linux/irq.h>
14 #include <linux/irqdomain.h>
15 #include <linux/kernel.h>
16 #include <linux/pci.h>
17 #include <linux/init.h>
18 #include <linux/platform_device.h>
19 #include <linux/of_address.h>
20 #include <linux/of_pci.h>
21
22 #include "../pci.h"
23 #include "../pci-bridge-emul.h"
24
25 /* PCIe core registers */
26 #define PCIE_CORE_DEV_ID_REG 0x0
27 #define PCIE_CORE_CMD_STATUS_REG 0x4
28 #define PCIE_CORE_CMD_IO_ACCESS_EN BIT(0)
29 #define PCIE_CORE_CMD_MEM_ACCESS_EN BIT(1)
30 #define PCIE_CORE_CMD_MEM_IO_REQ_EN BIT(2)
31 #define PCIE_CORE_DEV_REV_REG 0x8
32 #define PCIE_CORE_PCIEXP_CAP 0xc0
33 #define PCIE_CORE_DEV_CTRL_STATS_REG 0xc8
34 #define PCIE_CORE_DEV_CTRL_STATS_RELAX_ORDER_DISABLE (0 << 4)
35 #define PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SZ_SHIFT 5
36 #define PCIE_CORE_DEV_CTRL_STATS_SNOOP_DISABLE (0 << 11)
37 #define PCIE_CORE_DEV_CTRL_STATS_MAX_RD_REQ_SIZE_SHIFT 12
38 #define PCIE_CORE_DEV_CTRL_STATS_MAX_RD_REQ_SZ 0x2
39 #define PCIE_CORE_LINK_CTRL_STAT_REG 0xd0
40 #define PCIE_CORE_LINK_L0S_ENTRY BIT(0)
41 #define PCIE_CORE_LINK_TRAINING BIT(5)
42 #define PCIE_CORE_LINK_WIDTH_SHIFT 20
43 #define PCIE_CORE_ERR_CAPCTL_REG 0x118
44 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX BIT(5)
45 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN BIT(6)
46 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHCK BIT(7)
47 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHCK_RCV BIT(8)
48 #define PCIE_CORE_INT_A_ASSERT_ENABLE 1
49 #define PCIE_CORE_INT_B_ASSERT_ENABLE 2
50 #define PCIE_CORE_INT_C_ASSERT_ENABLE 3
51 #define PCIE_CORE_INT_D_ASSERT_ENABLE 4
52 /* PIO registers base address and register offsets */
53 #define PIO_BASE_ADDR 0x4000
54 #define PIO_CTRL (PIO_BASE_ADDR + 0x0)
55 #define PIO_CTRL_TYPE_MASK GENMASK(3, 0)
56 #define PIO_CTRL_ADDR_WIN_DISABLE BIT(24)
57 #define PIO_STAT (PIO_BASE_ADDR + 0x4)
58 #define PIO_COMPLETION_STATUS_SHIFT 7
59 #define PIO_COMPLETION_STATUS_MASK GENMASK(9, 7)
60 #define PIO_COMPLETION_STATUS_OK 0
61 #define PIO_COMPLETION_STATUS_UR 1
62 #define PIO_COMPLETION_STATUS_CRS 2
63 #define PIO_COMPLETION_STATUS_CA 4
64 #define PIO_NON_POSTED_REQ BIT(0)
65 #define PIO_ADDR_LS (PIO_BASE_ADDR + 0x8)
66 #define PIO_ADDR_MS (PIO_BASE_ADDR + 0xc)
67 #define PIO_WR_DATA (PIO_BASE_ADDR + 0x10)
68 #define PIO_WR_DATA_STRB (PIO_BASE_ADDR + 0x14)
69 #define PIO_RD_DATA (PIO_BASE_ADDR + 0x18)
70 #define PIO_START (PIO_BASE_ADDR + 0x1c)
71 #define PIO_ISR (PIO_BASE_ADDR + 0x20)
72 #define PIO_ISRM (PIO_BASE_ADDR + 0x24)
73
74 /* Aardvark Control registers */
75 #define CONTROL_BASE_ADDR 0x4800
76 #define PCIE_CORE_CTRL0_REG (CONTROL_BASE_ADDR + 0x0)
77 #define PCIE_GEN_SEL_MSK 0x3
78 #define PCIE_GEN_SEL_SHIFT 0x0
79 #define SPEED_GEN_1 0
80 #define SPEED_GEN_2 1
81 #define SPEED_GEN_3 2
82 #define IS_RC_MSK 1
83 #define IS_RC_SHIFT 2
84 #define LANE_CNT_MSK 0x18
85 #define LANE_CNT_SHIFT 0x3
86 #define LANE_COUNT_1 (0 << LANE_CNT_SHIFT)
87 #define LANE_COUNT_2 (1 << LANE_CNT_SHIFT)
88 #define LANE_COUNT_4 (2 << LANE_CNT_SHIFT)
89 #define LANE_COUNT_8 (3 << LANE_CNT_SHIFT)
90 #define LINK_TRAINING_EN BIT(6)
91 #define LEGACY_INTA BIT(28)
92 #define LEGACY_INTB BIT(29)
93 #define LEGACY_INTC BIT(30)
94 #define LEGACY_INTD BIT(31)
95 #define PCIE_CORE_CTRL1_REG (CONTROL_BASE_ADDR + 0x4)
96 #define HOT_RESET_GEN BIT(0)
97 #define PCIE_CORE_CTRL2_REG (CONTROL_BASE_ADDR + 0x8)
98 #define PCIE_CORE_CTRL2_RESERVED 0x7
99 #define PCIE_CORE_CTRL2_TD_ENABLE BIT(4)
100 #define PCIE_CORE_CTRL2_STRICT_ORDER_ENABLE BIT(5)
101 #define PCIE_CORE_CTRL2_OB_WIN_ENABLE BIT(6)
102 #define PCIE_CORE_CTRL2_MSI_ENABLE BIT(10)
103 #define PCIE_MSG_LOG_REG (CONTROL_BASE_ADDR + 0x30)
104 #define PCIE_ISR0_REG (CONTROL_BASE_ADDR + 0x40)
105 #define PCIE_MSG_PM_PME_MASK BIT(7)
106 #define PCIE_ISR0_MASK_REG (CONTROL_BASE_ADDR + 0x44)
107 #define PCIE_ISR0_MSI_INT_PENDING BIT(24)
108 #define PCIE_ISR0_INTX_ASSERT(val) BIT(16 + (val))
109 #define PCIE_ISR0_INTX_DEASSERT(val) BIT(20 + (val))
110 #define PCIE_ISR0_ALL_MASK GENMASK(26, 0)
111 #define PCIE_ISR1_REG (CONTROL_BASE_ADDR + 0x48)
112 #define PCIE_ISR1_MASK_REG (CONTROL_BASE_ADDR + 0x4C)
113 #define PCIE_ISR1_POWER_STATE_CHANGE BIT(4)
114 #define PCIE_ISR1_FLUSH BIT(5)
115 #define PCIE_ISR1_INTX_ASSERT(val) BIT(8 + (val))
116 #define PCIE_ISR1_ALL_MASK GENMASK(11, 4)
117 #define PCIE_MSI_ADDR_LOW_REG (CONTROL_BASE_ADDR + 0x50)
118 #define PCIE_MSI_ADDR_HIGH_REG (CONTROL_BASE_ADDR + 0x54)
119 #define PCIE_MSI_STATUS_REG (CONTROL_BASE_ADDR + 0x58)
120 #define PCIE_MSI_MASK_REG (CONTROL_BASE_ADDR + 0x5C)
121 #define PCIE_MSI_PAYLOAD_REG (CONTROL_BASE_ADDR + 0x9C)
122
123 /* LMI registers base address and register offsets */
124 #define LMI_BASE_ADDR 0x6000
125 #define CFG_REG (LMI_BASE_ADDR + 0x0)
126 #define LTSSM_SHIFT 24
127 #define LTSSM_MASK 0x3f
128 #define LTSSM_L0 0x10
129 #define RC_BAR_CONFIG 0x300
130
131 /* PCIe core controller registers */
132 #define CTRL_CORE_BASE_ADDR 0x18000
133 #define CTRL_CONFIG_REG (CTRL_CORE_BASE_ADDR + 0x0)
134 #define CTRL_MODE_SHIFT 0x0
135 #define CTRL_MODE_MASK 0x1
136 #define PCIE_CORE_MODE_DIRECT 0x0
137 #define PCIE_CORE_MODE_COMMAND 0x1
138
139 /* PCIe Central Interrupts Registers */
140 #define CENTRAL_INT_BASE_ADDR 0x1b000
141 #define HOST_CTRL_INT_STATUS_REG (CENTRAL_INT_BASE_ADDR + 0x0)
142 #define HOST_CTRL_INT_MASK_REG (CENTRAL_INT_BASE_ADDR + 0x4)
143 #define PCIE_IRQ_CMDQ_INT BIT(0)
144 #define PCIE_IRQ_MSI_STATUS_INT BIT(1)
145 #define PCIE_IRQ_CMD_SENT_DONE BIT(3)
146 #define PCIE_IRQ_DMA_INT BIT(4)
147 #define PCIE_IRQ_IB_DXFERDONE BIT(5)
148 #define PCIE_IRQ_OB_DXFERDONE BIT(6)
149 #define PCIE_IRQ_OB_RXFERDONE BIT(7)
150 #define PCIE_IRQ_COMPQ_INT BIT(12)
151 #define PCIE_IRQ_DIR_RD_DDR_DET BIT(13)
152 #define PCIE_IRQ_DIR_WR_DDR_DET BIT(14)
153 #define PCIE_IRQ_CORE_INT BIT(16)
154 #define PCIE_IRQ_CORE_INT_PIO BIT(17)
155 #define PCIE_IRQ_DPMU_INT BIT(18)
156 #define PCIE_IRQ_PCIE_MIS_INT BIT(19)
157 #define PCIE_IRQ_MSI_INT1_DET BIT(20)
158 #define PCIE_IRQ_MSI_INT2_DET BIT(21)
159 #define PCIE_IRQ_RC_DBELL_DET BIT(22)
160 #define PCIE_IRQ_EP_STATUS BIT(23)
161 #define PCIE_IRQ_ALL_MASK 0xfff0fb
162 #define PCIE_IRQ_ENABLE_INTS_MASK PCIE_IRQ_CORE_INT
163
164 /* Transaction types */
165 #define PCIE_CONFIG_RD_TYPE0 0x8
166 #define PCIE_CONFIG_RD_TYPE1 0x9
167 #define PCIE_CONFIG_WR_TYPE0 0xa
168 #define PCIE_CONFIG_WR_TYPE1 0xb
169
170 #define PCIE_CONF_BUS(bus) (((bus) & 0xff) << 20)
171 #define PCIE_CONF_DEV(dev) (((dev) & 0x1f) << 15)
172 #define PCIE_CONF_FUNC(fun) (((fun) & 0x7) << 12)
173 #define PCIE_CONF_REG(reg) ((reg) & 0xffc)
174 #define PCIE_CONF_ADDR(bus, devfn, where) \
175 (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
176 PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where))
177
178 #define PIO_TIMEOUT_MS 1
179
180 #define LINK_WAIT_MAX_RETRIES 10
181 #define LINK_WAIT_USLEEP_MIN 90000
182 #define LINK_WAIT_USLEEP_MAX 100000
183
184 #define MSI_IRQ_NUM 32
185
186 struct advk_pcie {
187 struct platform_device *pdev;
188 void __iomem *base;
189 struct list_head resources;
190 struct irq_domain *irq_domain;
191 struct irq_chip irq_chip;
192 struct irq_domain *msi_domain;
193 struct irq_domain *msi_inner_domain;
194 struct irq_chip msi_bottom_irq_chip;
195 struct irq_chip msi_irq_chip;
196 struct msi_domain_info msi_domain_info;
197 DECLARE_BITMAP(msi_used, MSI_IRQ_NUM);
198 struct mutex msi_used_lock;
199 u16 msi_msg;
200 int root_bus_nr;
201 struct pci_bridge_emul bridge;
202 };
203
advk_writel(struct advk_pcie * pcie,u32 val,u64 reg)204 static inline void advk_writel(struct advk_pcie *pcie, u32 val, u64 reg)
205 {
206 writel(val, pcie->base + reg);
207 }
208
advk_readl(struct advk_pcie * pcie,u64 reg)209 static inline u32 advk_readl(struct advk_pcie *pcie, u64 reg)
210 {
211 return readl(pcie->base + reg);
212 }
213
advk_pcie_link_up(struct advk_pcie * pcie)214 static int advk_pcie_link_up(struct advk_pcie *pcie)
215 {
216 u32 val, ltssm_state;
217
218 val = advk_readl(pcie, CFG_REG);
219 ltssm_state = (val >> LTSSM_SHIFT) & LTSSM_MASK;
220 return ltssm_state >= LTSSM_L0;
221 }
222
advk_pcie_wait_for_link(struct advk_pcie * pcie)223 static int advk_pcie_wait_for_link(struct advk_pcie *pcie)
224 {
225 struct device *dev = &pcie->pdev->dev;
226 int retries;
227
228 /* check if the link is up or not */
229 for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
230 if (advk_pcie_link_up(pcie)) {
231 dev_info(dev, "link up\n");
232 return 0;
233 }
234
235 usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
236 }
237
238 dev_err(dev, "link never came up\n");
239 return -ETIMEDOUT;
240 }
241
advk_pcie_setup_hw(struct advk_pcie * pcie)242 static void advk_pcie_setup_hw(struct advk_pcie *pcie)
243 {
244 u32 reg;
245
246 /* Set to Direct mode */
247 reg = advk_readl(pcie, CTRL_CONFIG_REG);
248 reg &= ~(CTRL_MODE_MASK << CTRL_MODE_SHIFT);
249 reg |= ((PCIE_CORE_MODE_DIRECT & CTRL_MODE_MASK) << CTRL_MODE_SHIFT);
250 advk_writel(pcie, reg, CTRL_CONFIG_REG);
251
252 /* Set PCI global control register to RC mode */
253 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
254 reg |= (IS_RC_MSK << IS_RC_SHIFT);
255 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
256
257 /* Set Advanced Error Capabilities and Control PF0 register */
258 reg = PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX |
259 PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN |
260 PCIE_CORE_ERR_CAPCTL_ECRC_CHCK |
261 PCIE_CORE_ERR_CAPCTL_ECRC_CHCK_RCV;
262 advk_writel(pcie, reg, PCIE_CORE_ERR_CAPCTL_REG);
263
264 /* Set PCIe Device Control and Status 1 PF0 register */
265 reg = PCIE_CORE_DEV_CTRL_STATS_RELAX_ORDER_DISABLE |
266 (7 << PCIE_CORE_DEV_CTRL_STATS_MAX_PAYLOAD_SZ_SHIFT) |
267 PCIE_CORE_DEV_CTRL_STATS_SNOOP_DISABLE |
268 (PCIE_CORE_DEV_CTRL_STATS_MAX_RD_REQ_SZ <<
269 PCIE_CORE_DEV_CTRL_STATS_MAX_RD_REQ_SIZE_SHIFT);
270 advk_writel(pcie, reg, PCIE_CORE_DEV_CTRL_STATS_REG);
271
272 /* Program PCIe Control 2 to disable strict ordering */
273 reg = PCIE_CORE_CTRL2_RESERVED |
274 PCIE_CORE_CTRL2_TD_ENABLE;
275 advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
276
277 /* Set GEN2 */
278 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
279 reg &= ~PCIE_GEN_SEL_MSK;
280 reg |= SPEED_GEN_2;
281 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
282
283 /* Set lane X1 */
284 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
285 reg &= ~LANE_CNT_MSK;
286 reg |= LANE_COUNT_1;
287 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
288
289 /* Enable link training */
290 reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
291 reg |= LINK_TRAINING_EN;
292 advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
293
294 /* Enable MSI */
295 reg = advk_readl(pcie, PCIE_CORE_CTRL2_REG);
296 reg |= PCIE_CORE_CTRL2_MSI_ENABLE;
297 advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
298
299 /* Clear all interrupts */
300 advk_writel(pcie, PCIE_ISR0_ALL_MASK, PCIE_ISR0_REG);
301 advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_REG);
302 advk_writel(pcie, PCIE_IRQ_ALL_MASK, HOST_CTRL_INT_STATUS_REG);
303
304 /* Disable All ISR0/1 Sources */
305 reg = PCIE_ISR0_ALL_MASK;
306 reg &= ~PCIE_ISR0_MSI_INT_PENDING;
307 advk_writel(pcie, reg, PCIE_ISR0_MASK_REG);
308
309 advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_MASK_REG);
310
311 /* Unmask all MSIs */
312 advk_writel(pcie, 0, PCIE_MSI_MASK_REG);
313
314 /* Enable summary interrupt for GIC SPI source */
315 reg = PCIE_IRQ_ALL_MASK & (~PCIE_IRQ_ENABLE_INTS_MASK);
316 advk_writel(pcie, reg, HOST_CTRL_INT_MASK_REG);
317
318 reg = advk_readl(pcie, PCIE_CORE_CTRL2_REG);
319 reg |= PCIE_CORE_CTRL2_OB_WIN_ENABLE;
320 advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
321
322 /* Bypass the address window mapping for PIO */
323 reg = advk_readl(pcie, PIO_CTRL);
324 reg |= PIO_CTRL_ADDR_WIN_DISABLE;
325 advk_writel(pcie, reg, PIO_CTRL);
326
327 /* Start link training */
328 reg = advk_readl(pcie, PCIE_CORE_LINK_CTRL_STAT_REG);
329 reg |= PCIE_CORE_LINK_TRAINING;
330 advk_writel(pcie, reg, PCIE_CORE_LINK_CTRL_STAT_REG);
331
332 advk_pcie_wait_for_link(pcie);
333
334 reg = PCIE_CORE_LINK_L0S_ENTRY |
335 (1 << PCIE_CORE_LINK_WIDTH_SHIFT);
336 advk_writel(pcie, reg, PCIE_CORE_LINK_CTRL_STAT_REG);
337
338 reg = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG);
339 reg |= PCIE_CORE_CMD_MEM_ACCESS_EN |
340 PCIE_CORE_CMD_IO_ACCESS_EN |
341 PCIE_CORE_CMD_MEM_IO_REQ_EN;
342 advk_writel(pcie, reg, PCIE_CORE_CMD_STATUS_REG);
343 }
344
advk_pcie_check_pio_status(struct advk_pcie * pcie)345 static void advk_pcie_check_pio_status(struct advk_pcie *pcie)
346 {
347 struct device *dev = &pcie->pdev->dev;
348 u32 reg;
349 unsigned int status;
350 char *strcomp_status, *str_posted;
351
352 reg = advk_readl(pcie, PIO_STAT);
353 status = (reg & PIO_COMPLETION_STATUS_MASK) >>
354 PIO_COMPLETION_STATUS_SHIFT;
355
356 if (!status)
357 return;
358
359 switch (status) {
360 case PIO_COMPLETION_STATUS_UR:
361 strcomp_status = "UR";
362 break;
363 case PIO_COMPLETION_STATUS_CRS:
364 strcomp_status = "CRS";
365 break;
366 case PIO_COMPLETION_STATUS_CA:
367 strcomp_status = "CA";
368 break;
369 default:
370 strcomp_status = "Unknown";
371 break;
372 }
373
374 if (reg & PIO_NON_POSTED_REQ)
375 str_posted = "Non-posted";
376 else
377 str_posted = "Posted";
378
379 dev_err(dev, "%s PIO Response Status: %s, %#x @ %#x\n",
380 str_posted, strcomp_status, reg, advk_readl(pcie, PIO_ADDR_LS));
381 }
382
advk_pcie_wait_pio(struct advk_pcie * pcie)383 static int advk_pcie_wait_pio(struct advk_pcie *pcie)
384 {
385 struct device *dev = &pcie->pdev->dev;
386 unsigned long timeout;
387
388 timeout = jiffies + msecs_to_jiffies(PIO_TIMEOUT_MS);
389
390 while (time_before(jiffies, timeout)) {
391 u32 start, isr;
392
393 start = advk_readl(pcie, PIO_START);
394 isr = advk_readl(pcie, PIO_ISR);
395 if (!start && isr)
396 return 0;
397 }
398
399 dev_err(dev, "config read/write timed out\n");
400 return -ETIMEDOUT;
401 }
402
403
404 static pci_bridge_emul_read_status_t
advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul * bridge,int reg,u32 * value)405 advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
406 int reg, u32 *value)
407 {
408 struct advk_pcie *pcie = bridge->data;
409
410
411 switch (reg) {
412 case PCI_EXP_SLTCTL:
413 *value = PCI_EXP_SLTSTA_PDS << 16;
414 return PCI_BRIDGE_EMUL_HANDLED;
415
416 case PCI_EXP_RTCTL: {
417 u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG);
418 *value = (val & PCIE_MSG_PM_PME_MASK) ? PCI_EXP_RTCTL_PMEIE : 0;
419 return PCI_BRIDGE_EMUL_HANDLED;
420 }
421
422 case PCI_EXP_RTSTA: {
423 u32 isr0 = advk_readl(pcie, PCIE_ISR0_REG);
424 u32 msglog = advk_readl(pcie, PCIE_MSG_LOG_REG);
425 *value = (isr0 & PCIE_MSG_PM_PME_MASK) << 16 | (msglog >> 16);
426 return PCI_BRIDGE_EMUL_HANDLED;
427 }
428
429 case PCI_CAP_LIST_ID:
430 case PCI_EXP_DEVCAP:
431 case PCI_EXP_DEVCTL:
432 case PCI_EXP_LNKCAP:
433 case PCI_EXP_LNKCTL:
434 *value = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + reg);
435 return PCI_BRIDGE_EMUL_HANDLED;
436 default:
437 return PCI_BRIDGE_EMUL_NOT_HANDLED;
438 }
439
440 }
441
442 static void
advk_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul * bridge,int reg,u32 old,u32 new,u32 mask)443 advk_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge,
444 int reg, u32 old, u32 new, u32 mask)
445 {
446 struct advk_pcie *pcie = bridge->data;
447
448 switch (reg) {
449 case PCI_EXP_DEVCTL:
450 case PCI_EXP_LNKCTL:
451 advk_writel(pcie, new, PCIE_CORE_PCIEXP_CAP + reg);
452 break;
453
454 case PCI_EXP_RTCTL:
455 new = (new & PCI_EXP_RTCTL_PMEIE) << 3;
456 advk_writel(pcie, new, PCIE_ISR0_MASK_REG);
457 break;
458
459 case PCI_EXP_RTSTA:
460 new = (new & PCI_EXP_RTSTA_PME) >> 9;
461 advk_writel(pcie, new, PCIE_ISR0_REG);
462 break;
463
464 default:
465 break;
466 }
467 }
468
469 static struct pci_bridge_emul_ops advk_pci_bridge_emul_ops = {
470 .read_pcie = advk_pci_bridge_emul_pcie_conf_read,
471 .write_pcie = advk_pci_bridge_emul_pcie_conf_write,
472 };
473
474 /*
475 * Initialize the configuration space of the PCI-to-PCI bridge
476 * associated with the given PCIe interface.
477 */
advk_sw_pci_bridge_init(struct advk_pcie * pcie)478 static void advk_sw_pci_bridge_init(struct advk_pcie *pcie)
479 {
480 struct pci_bridge_emul *bridge = &pcie->bridge;
481
482 bridge->conf.vendor = advk_readl(pcie, PCIE_CORE_DEV_ID_REG) & 0xffff;
483 bridge->conf.device = advk_readl(pcie, PCIE_CORE_DEV_ID_REG) >> 16;
484 bridge->conf.class_revision =
485 advk_readl(pcie, PCIE_CORE_DEV_REV_REG) & 0xff;
486
487 /* Support 32 bits I/O addressing */
488 bridge->conf.iobase = PCI_IO_RANGE_TYPE_32;
489 bridge->conf.iolimit = PCI_IO_RANGE_TYPE_32;
490
491 /* Support 64 bits memory pref */
492 bridge->conf.pref_mem_base = PCI_PREF_RANGE_TYPE_64;
493 bridge->conf.pref_mem_limit = PCI_PREF_RANGE_TYPE_64;
494
495 /* Support interrupt A for MSI feature */
496 bridge->conf.intpin = PCIE_CORE_INT_A_ASSERT_ENABLE;
497
498 bridge->has_pcie = true;
499 bridge->data = pcie;
500 bridge->ops = &advk_pci_bridge_emul_ops;
501
502 pci_bridge_emul_init(bridge, 0);
503
504 }
505
advk_pcie_valid_device(struct advk_pcie * pcie,struct pci_bus * bus,int devfn)506 static bool advk_pcie_valid_device(struct advk_pcie *pcie, struct pci_bus *bus,
507 int devfn)
508 {
509 if ((bus->number == pcie->root_bus_nr) && PCI_SLOT(devfn) != 0)
510 return false;
511
512 return true;
513 }
514
advk_pcie_rd_conf(struct pci_bus * bus,u32 devfn,int where,int size,u32 * val)515 static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
516 int where, int size, u32 *val)
517 {
518 struct advk_pcie *pcie = bus->sysdata;
519 u32 reg;
520 int ret;
521
522 if (!advk_pcie_valid_device(pcie, bus, devfn)) {
523 *val = 0xffffffff;
524 return PCIBIOS_DEVICE_NOT_FOUND;
525 }
526
527 if (bus->number == pcie->root_bus_nr)
528 return pci_bridge_emul_conf_read(&pcie->bridge, where,
529 size, val);
530
531 /* Start PIO */
532 advk_writel(pcie, 0, PIO_START);
533 advk_writel(pcie, 1, PIO_ISR);
534
535 /* Program the control register */
536 reg = advk_readl(pcie, PIO_CTRL);
537 reg &= ~PIO_CTRL_TYPE_MASK;
538 if (bus->primary == pcie->root_bus_nr)
539 reg |= PCIE_CONFIG_RD_TYPE0;
540 else
541 reg |= PCIE_CONFIG_RD_TYPE1;
542 advk_writel(pcie, reg, PIO_CTRL);
543
544 /* Program the address registers */
545 reg = PCIE_CONF_ADDR(bus->number, devfn, where);
546 advk_writel(pcie, reg, PIO_ADDR_LS);
547 advk_writel(pcie, 0, PIO_ADDR_MS);
548
549 /* Program the data strobe */
550 advk_writel(pcie, 0xf, PIO_WR_DATA_STRB);
551
552 /* Start the transfer */
553 advk_writel(pcie, 1, PIO_START);
554
555 ret = advk_pcie_wait_pio(pcie);
556 if (ret < 0)
557 return PCIBIOS_SET_FAILED;
558
559 advk_pcie_check_pio_status(pcie);
560
561 /* Get the read result */
562 *val = advk_readl(pcie, PIO_RD_DATA);
563 if (size == 1)
564 *val = (*val >> (8 * (where & 3))) & 0xff;
565 else if (size == 2)
566 *val = (*val >> (8 * (where & 3))) & 0xffff;
567
568 return PCIBIOS_SUCCESSFUL;
569 }
570
advk_pcie_wr_conf(struct pci_bus * bus,u32 devfn,int where,int size,u32 val)571 static int advk_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
572 int where, int size, u32 val)
573 {
574 struct advk_pcie *pcie = bus->sysdata;
575 u32 reg;
576 u32 data_strobe = 0x0;
577 int offset;
578 int ret;
579
580 if (!advk_pcie_valid_device(pcie, bus, devfn))
581 return PCIBIOS_DEVICE_NOT_FOUND;
582
583 if (bus->number == pcie->root_bus_nr)
584 return pci_bridge_emul_conf_write(&pcie->bridge, where,
585 size, val);
586
587 if (where % size)
588 return PCIBIOS_SET_FAILED;
589
590 /* Start PIO */
591 advk_writel(pcie, 0, PIO_START);
592 advk_writel(pcie, 1, PIO_ISR);
593
594 /* Program the control register */
595 reg = advk_readl(pcie, PIO_CTRL);
596 reg &= ~PIO_CTRL_TYPE_MASK;
597 if (bus->primary == pcie->root_bus_nr)
598 reg |= PCIE_CONFIG_WR_TYPE0;
599 else
600 reg |= PCIE_CONFIG_WR_TYPE1;
601 advk_writel(pcie, reg, PIO_CTRL);
602
603 /* Program the address registers */
604 reg = PCIE_CONF_ADDR(bus->number, devfn, where);
605 advk_writel(pcie, reg, PIO_ADDR_LS);
606 advk_writel(pcie, 0, PIO_ADDR_MS);
607
608 /* Calculate the write strobe */
609 offset = where & 0x3;
610 reg = val << (8 * offset);
611 data_strobe = GENMASK(size - 1, 0) << offset;
612
613 /* Program the data register */
614 advk_writel(pcie, reg, PIO_WR_DATA);
615
616 /* Program the data strobe */
617 advk_writel(pcie, data_strobe, PIO_WR_DATA_STRB);
618
619 /* Start the transfer */
620 advk_writel(pcie, 1, PIO_START);
621
622 ret = advk_pcie_wait_pio(pcie);
623 if (ret < 0)
624 return PCIBIOS_SET_FAILED;
625
626 advk_pcie_check_pio_status(pcie);
627
628 return PCIBIOS_SUCCESSFUL;
629 }
630
631 static struct pci_ops advk_pcie_ops = {
632 .read = advk_pcie_rd_conf,
633 .write = advk_pcie_wr_conf,
634 };
635
advk_msi_irq_compose_msi_msg(struct irq_data * data,struct msi_msg * msg)636 static void advk_msi_irq_compose_msi_msg(struct irq_data *data,
637 struct msi_msg *msg)
638 {
639 struct advk_pcie *pcie = irq_data_get_irq_chip_data(data);
640 phys_addr_t msi_msg = virt_to_phys(&pcie->msi_msg);
641
642 msg->address_lo = lower_32_bits(msi_msg);
643 msg->address_hi = upper_32_bits(msi_msg);
644 msg->data = data->irq;
645 }
646
advk_msi_set_affinity(struct irq_data * irq_data,const struct cpumask * mask,bool force)647 static int advk_msi_set_affinity(struct irq_data *irq_data,
648 const struct cpumask *mask, bool force)
649 {
650 return -EINVAL;
651 }
652
advk_msi_irq_domain_alloc(struct irq_domain * domain,unsigned int virq,unsigned int nr_irqs,void * args)653 static int advk_msi_irq_domain_alloc(struct irq_domain *domain,
654 unsigned int virq,
655 unsigned int nr_irqs, void *args)
656 {
657 struct advk_pcie *pcie = domain->host_data;
658 int hwirq, i;
659
660 mutex_lock(&pcie->msi_used_lock);
661 hwirq = bitmap_find_next_zero_area(pcie->msi_used, MSI_IRQ_NUM,
662 0, nr_irqs, 0);
663 if (hwirq >= MSI_IRQ_NUM) {
664 mutex_unlock(&pcie->msi_used_lock);
665 return -ENOSPC;
666 }
667
668 bitmap_set(pcie->msi_used, hwirq, nr_irqs);
669 mutex_unlock(&pcie->msi_used_lock);
670
671 for (i = 0; i < nr_irqs; i++)
672 irq_domain_set_info(domain, virq + i, hwirq + i,
673 &pcie->msi_bottom_irq_chip,
674 domain->host_data, handle_simple_irq,
675 NULL, NULL);
676
677 return hwirq;
678 }
679
advk_msi_irq_domain_free(struct irq_domain * domain,unsigned int virq,unsigned int nr_irqs)680 static void advk_msi_irq_domain_free(struct irq_domain *domain,
681 unsigned int virq, unsigned int nr_irqs)
682 {
683 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
684 struct advk_pcie *pcie = domain->host_data;
685
686 mutex_lock(&pcie->msi_used_lock);
687 bitmap_clear(pcie->msi_used, d->hwirq, nr_irqs);
688 mutex_unlock(&pcie->msi_used_lock);
689 }
690
691 static const struct irq_domain_ops advk_msi_domain_ops = {
692 .alloc = advk_msi_irq_domain_alloc,
693 .free = advk_msi_irq_domain_free,
694 };
695
advk_pcie_irq_mask(struct irq_data * d)696 static void advk_pcie_irq_mask(struct irq_data *d)
697 {
698 struct advk_pcie *pcie = d->domain->host_data;
699 irq_hw_number_t hwirq = irqd_to_hwirq(d);
700 u32 mask;
701
702 mask = advk_readl(pcie, PCIE_ISR1_MASK_REG);
703 mask |= PCIE_ISR1_INTX_ASSERT(hwirq);
704 advk_writel(pcie, mask, PCIE_ISR1_MASK_REG);
705 }
706
advk_pcie_irq_unmask(struct irq_data * d)707 static void advk_pcie_irq_unmask(struct irq_data *d)
708 {
709 struct advk_pcie *pcie = d->domain->host_data;
710 irq_hw_number_t hwirq = irqd_to_hwirq(d);
711 u32 mask;
712
713 mask = advk_readl(pcie, PCIE_ISR1_MASK_REG);
714 mask &= ~PCIE_ISR1_INTX_ASSERT(hwirq);
715 advk_writel(pcie, mask, PCIE_ISR1_MASK_REG);
716 }
717
advk_pcie_irq_map(struct irq_domain * h,unsigned int virq,irq_hw_number_t hwirq)718 static int advk_pcie_irq_map(struct irq_domain *h,
719 unsigned int virq, irq_hw_number_t hwirq)
720 {
721 struct advk_pcie *pcie = h->host_data;
722
723 advk_pcie_irq_mask(irq_get_irq_data(virq));
724 irq_set_status_flags(virq, IRQ_LEVEL);
725 irq_set_chip_and_handler(virq, &pcie->irq_chip,
726 handle_level_irq);
727 irq_set_chip_data(virq, pcie);
728
729 return 0;
730 }
731
732 static const struct irq_domain_ops advk_pcie_irq_domain_ops = {
733 .map = advk_pcie_irq_map,
734 .xlate = irq_domain_xlate_onecell,
735 };
736
advk_pcie_init_msi_irq_domain(struct advk_pcie * pcie)737 static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
738 {
739 struct device *dev = &pcie->pdev->dev;
740 struct device_node *node = dev->of_node;
741 struct irq_chip *bottom_ic, *msi_ic;
742 struct msi_domain_info *msi_di;
743 phys_addr_t msi_msg_phys;
744
745 mutex_init(&pcie->msi_used_lock);
746
747 bottom_ic = &pcie->msi_bottom_irq_chip;
748
749 bottom_ic->name = "MSI";
750 bottom_ic->irq_compose_msi_msg = advk_msi_irq_compose_msi_msg;
751 bottom_ic->irq_set_affinity = advk_msi_set_affinity;
752
753 msi_ic = &pcie->msi_irq_chip;
754 msi_ic->name = "advk-MSI";
755
756 msi_di = &pcie->msi_domain_info;
757 msi_di->flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
758 MSI_FLAG_MULTI_PCI_MSI;
759 msi_di->chip = msi_ic;
760
761 msi_msg_phys = virt_to_phys(&pcie->msi_msg);
762
763 advk_writel(pcie, lower_32_bits(msi_msg_phys),
764 PCIE_MSI_ADDR_LOW_REG);
765 advk_writel(pcie, upper_32_bits(msi_msg_phys),
766 PCIE_MSI_ADDR_HIGH_REG);
767
768 pcie->msi_inner_domain =
769 irq_domain_add_linear(NULL, MSI_IRQ_NUM,
770 &advk_msi_domain_ops, pcie);
771 if (!pcie->msi_inner_domain)
772 return -ENOMEM;
773
774 pcie->msi_domain =
775 pci_msi_create_irq_domain(of_node_to_fwnode(node),
776 msi_di, pcie->msi_inner_domain);
777 if (!pcie->msi_domain) {
778 irq_domain_remove(pcie->msi_inner_domain);
779 return -ENOMEM;
780 }
781
782 return 0;
783 }
784
advk_pcie_remove_msi_irq_domain(struct advk_pcie * pcie)785 static void advk_pcie_remove_msi_irq_domain(struct advk_pcie *pcie)
786 {
787 irq_domain_remove(pcie->msi_domain);
788 irq_domain_remove(pcie->msi_inner_domain);
789 }
790
advk_pcie_init_irq_domain(struct advk_pcie * pcie)791 static int advk_pcie_init_irq_domain(struct advk_pcie *pcie)
792 {
793 struct device *dev = &pcie->pdev->dev;
794 struct device_node *node = dev->of_node;
795 struct device_node *pcie_intc_node;
796 struct irq_chip *irq_chip;
797 int ret = 0;
798
799 pcie_intc_node = of_get_next_child(node, NULL);
800 if (!pcie_intc_node) {
801 dev_err(dev, "No PCIe Intc node found\n");
802 return -ENODEV;
803 }
804
805 irq_chip = &pcie->irq_chip;
806
807 irq_chip->name = devm_kasprintf(dev, GFP_KERNEL, "%s-irq",
808 dev_name(dev));
809 if (!irq_chip->name) {
810 ret = -ENOMEM;
811 goto out_put_node;
812 }
813
814 irq_chip->irq_mask = advk_pcie_irq_mask;
815 irq_chip->irq_mask_ack = advk_pcie_irq_mask;
816 irq_chip->irq_unmask = advk_pcie_irq_unmask;
817
818 pcie->irq_domain =
819 irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
820 &advk_pcie_irq_domain_ops, pcie);
821 if (!pcie->irq_domain) {
822 dev_err(dev, "Failed to get a INTx IRQ domain\n");
823 ret = -ENOMEM;
824 goto out_put_node;
825 }
826
827 out_put_node:
828 of_node_put(pcie_intc_node);
829 return ret;
830 }
831
advk_pcie_remove_irq_domain(struct advk_pcie * pcie)832 static void advk_pcie_remove_irq_domain(struct advk_pcie *pcie)
833 {
834 irq_domain_remove(pcie->irq_domain);
835 }
836
advk_pcie_handle_msi(struct advk_pcie * pcie)837 static void advk_pcie_handle_msi(struct advk_pcie *pcie)
838 {
839 u32 msi_val, msi_mask, msi_status, msi_idx;
840 u16 msi_data;
841
842 msi_mask = advk_readl(pcie, PCIE_MSI_MASK_REG);
843 msi_val = advk_readl(pcie, PCIE_MSI_STATUS_REG);
844 msi_status = msi_val & ~msi_mask;
845
846 for (msi_idx = 0; msi_idx < MSI_IRQ_NUM; msi_idx++) {
847 if (!(BIT(msi_idx) & msi_status))
848 continue;
849
850 advk_writel(pcie, BIT(msi_idx), PCIE_MSI_STATUS_REG);
851 msi_data = advk_readl(pcie, PCIE_MSI_PAYLOAD_REG) & 0xFF;
852 generic_handle_irq(msi_data);
853 }
854
855 advk_writel(pcie, PCIE_ISR0_MSI_INT_PENDING,
856 PCIE_ISR0_REG);
857 }
858
advk_pcie_handle_int(struct advk_pcie * pcie)859 static void advk_pcie_handle_int(struct advk_pcie *pcie)
860 {
861 u32 isr0_val, isr0_mask, isr0_status;
862 u32 isr1_val, isr1_mask, isr1_status;
863 int i, virq;
864
865 isr0_val = advk_readl(pcie, PCIE_ISR0_REG);
866 isr0_mask = advk_readl(pcie, PCIE_ISR0_MASK_REG);
867 isr0_status = isr0_val & ((~isr0_mask) & PCIE_ISR0_ALL_MASK);
868
869 isr1_val = advk_readl(pcie, PCIE_ISR1_REG);
870 isr1_mask = advk_readl(pcie, PCIE_ISR1_MASK_REG);
871 isr1_status = isr1_val & ((~isr1_mask) & PCIE_ISR1_ALL_MASK);
872
873 if (!isr0_status && !isr1_status) {
874 advk_writel(pcie, isr0_val, PCIE_ISR0_REG);
875 advk_writel(pcie, isr1_val, PCIE_ISR1_REG);
876 return;
877 }
878
879 /* Process MSI interrupts */
880 if (isr0_status & PCIE_ISR0_MSI_INT_PENDING)
881 advk_pcie_handle_msi(pcie);
882
883 /* Process legacy interrupts */
884 for (i = 0; i < PCI_NUM_INTX; i++) {
885 if (!(isr1_status & PCIE_ISR1_INTX_ASSERT(i)))
886 continue;
887
888 advk_writel(pcie, PCIE_ISR1_INTX_ASSERT(i),
889 PCIE_ISR1_REG);
890
891 virq = irq_find_mapping(pcie->irq_domain, i);
892 generic_handle_irq(virq);
893 }
894 }
895
advk_pcie_irq_handler(int irq,void * arg)896 static irqreturn_t advk_pcie_irq_handler(int irq, void *arg)
897 {
898 struct advk_pcie *pcie = arg;
899 u32 status;
900
901 status = advk_readl(pcie, HOST_CTRL_INT_STATUS_REG);
902 if (!(status & PCIE_IRQ_CORE_INT))
903 return IRQ_NONE;
904
905 advk_pcie_handle_int(pcie);
906
907 /* Clear interrupt */
908 advk_writel(pcie, PCIE_IRQ_CORE_INT, HOST_CTRL_INT_STATUS_REG);
909
910 return IRQ_HANDLED;
911 }
912
advk_pcie_parse_request_of_pci_ranges(struct advk_pcie * pcie)913 static int advk_pcie_parse_request_of_pci_ranges(struct advk_pcie *pcie)
914 {
915 int err, res_valid = 0;
916 struct device *dev = &pcie->pdev->dev;
917 struct resource_entry *win, *tmp;
918 resource_size_t iobase;
919
920 INIT_LIST_HEAD(&pcie->resources);
921
922 err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff,
923 &pcie->resources, &iobase);
924 if (err)
925 return err;
926
927 err = devm_request_pci_bus_resources(dev, &pcie->resources);
928 if (err)
929 goto out_release_res;
930
931 resource_list_for_each_entry_safe(win, tmp, &pcie->resources) {
932 struct resource *res = win->res;
933
934 switch (resource_type(res)) {
935 case IORESOURCE_IO:
936 err = devm_pci_remap_iospace(dev, res, iobase);
937 if (err) {
938 dev_warn(dev, "error %d: failed to map resource %pR\n",
939 err, res);
940 resource_list_destroy_entry(win);
941 }
942 break;
943 case IORESOURCE_MEM:
944 res_valid |= !(res->flags & IORESOURCE_PREFETCH);
945 break;
946 case IORESOURCE_BUS:
947 pcie->root_bus_nr = res->start;
948 break;
949 }
950 }
951
952 if (!res_valid) {
953 dev_err(dev, "non-prefetchable memory resource required\n");
954 err = -EINVAL;
955 goto out_release_res;
956 }
957
958 return 0;
959
960 out_release_res:
961 pci_free_resource_list(&pcie->resources);
962 return err;
963 }
964
advk_pcie_probe(struct platform_device * pdev)965 static int advk_pcie_probe(struct platform_device *pdev)
966 {
967 struct device *dev = &pdev->dev;
968 struct advk_pcie *pcie;
969 struct resource *res;
970 struct pci_host_bridge *bridge;
971 int ret, irq;
972
973 bridge = devm_pci_alloc_host_bridge(dev, sizeof(struct advk_pcie));
974 if (!bridge)
975 return -ENOMEM;
976
977 pcie = pci_host_bridge_priv(bridge);
978 pcie->pdev = pdev;
979
980 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
981 pcie->base = devm_ioremap_resource(dev, res);
982 if (IS_ERR(pcie->base))
983 return PTR_ERR(pcie->base);
984
985 irq = platform_get_irq(pdev, 0);
986 ret = devm_request_irq(dev, irq, advk_pcie_irq_handler,
987 IRQF_SHARED | IRQF_NO_THREAD, "advk-pcie",
988 pcie);
989 if (ret) {
990 dev_err(dev, "Failed to register interrupt\n");
991 return ret;
992 }
993
994 ret = advk_pcie_parse_request_of_pci_ranges(pcie);
995 if (ret) {
996 dev_err(dev, "Failed to parse resources\n");
997 return ret;
998 }
999
1000 advk_pcie_setup_hw(pcie);
1001
1002 advk_sw_pci_bridge_init(pcie);
1003
1004 ret = advk_pcie_init_irq_domain(pcie);
1005 if (ret) {
1006 dev_err(dev, "Failed to initialize irq\n");
1007 return ret;
1008 }
1009
1010 ret = advk_pcie_init_msi_irq_domain(pcie);
1011 if (ret) {
1012 dev_err(dev, "Failed to initialize irq\n");
1013 advk_pcie_remove_irq_domain(pcie);
1014 return ret;
1015 }
1016
1017 list_splice_init(&pcie->resources, &bridge->windows);
1018 bridge->dev.parent = dev;
1019 bridge->sysdata = pcie;
1020 bridge->busnr = 0;
1021 bridge->ops = &advk_pcie_ops;
1022 bridge->map_irq = of_irq_parse_and_map_pci;
1023 bridge->swizzle_irq = pci_common_swizzle;
1024
1025 ret = pci_host_probe(bridge);
1026 if (ret < 0) {
1027 advk_pcie_remove_msi_irq_domain(pcie);
1028 advk_pcie_remove_irq_domain(pcie);
1029 return ret;
1030 }
1031
1032 return 0;
1033 }
1034
1035 static const struct of_device_id advk_pcie_of_match_table[] = {
1036 { .compatible = "marvell,armada-3700-pcie", },
1037 {},
1038 };
1039
1040 static struct platform_driver advk_pcie_driver = {
1041 .driver = {
1042 .name = "advk-pcie",
1043 .of_match_table = advk_pcie_of_match_table,
1044 /* Driver unloading/unbinding currently not supported */
1045 .suppress_bind_attrs = true,
1046 },
1047 .probe = advk_pcie_probe,
1048 };
1049 builtin_platform_driver(advk_pcie_driver);
1050
