diff options
Diffstat (limited to 'drivers/pci/dwc/pci-exynos.c')
-rw-r--r-- | drivers/pci/dwc/pci-exynos.c | 227 |
1 files changed, 14 insertions, 213 deletions
diff --git a/drivers/pci/dwc/pci-exynos.c b/drivers/pci/dwc/pci-exynos.c index 5596fdedbb94..ca6278113936 100644 --- a/drivers/pci/dwc/pci-exynos.c +++ b/drivers/pci/dwc/pci-exynos.c | |||
@@ -1,3 +1,4 @@ | |||
1 | // SPDX-License-Identifier: GPL-2.0 | ||
1 | /* | 2 | /* |
2 | * PCIe host controller driver for Samsung EXYNOS SoCs | 3 | * PCIe host controller driver for Samsung EXYNOS SoCs |
3 | * | 4 | * |
@@ -5,10 +6,6 @@ | |||
5 | * http://www.samsung.com | 6 | * http://www.samsung.com |
6 | * | 7 | * |
7 | * Author: Jingoo Han <jg1.han@samsung.com> | 8 | * Author: Jingoo Han <jg1.han@samsung.com> |
8 | * | ||
9 | * This program is free software; you can redistribute it and/or modify | ||
10 | * it under the terms of the GNU General Public License version 2 as | ||
11 | * published by the Free Software Foundation. | ||
12 | */ | 9 | */ |
13 | 10 | ||
14 | #include <linux/clk.h> | 11 | #include <linux/clk.h> |
@@ -55,49 +52,8 @@ | |||
55 | #define PCIE_ELBI_SLV_ARMISC 0x120 | 52 | #define PCIE_ELBI_SLV_ARMISC 0x120 |
56 | #define PCIE_ELBI_SLV_DBI_ENABLE BIT(21) | 53 | #define PCIE_ELBI_SLV_DBI_ENABLE BIT(21) |
57 | 54 | ||
58 | /* PCIe Purple registers */ | ||
59 | #define PCIE_PHY_GLOBAL_RESET 0x000 | ||
60 | #define PCIE_PHY_COMMON_RESET 0x004 | ||
61 | #define PCIE_PHY_CMN_REG 0x008 | ||
62 | #define PCIE_PHY_MAC_RESET 0x00c | ||
63 | #define PCIE_PHY_PLL_LOCKED 0x010 | ||
64 | #define PCIE_PHY_TRSVREG_RESET 0x020 | ||
65 | #define PCIE_PHY_TRSV_RESET 0x024 | ||
66 | |||
67 | /* PCIe PHY registers */ | ||
68 | #define PCIE_PHY_IMPEDANCE 0x004 | ||
69 | #define PCIE_PHY_PLL_DIV_0 0x008 | ||
70 | #define PCIE_PHY_PLL_BIAS 0x00c | ||
71 | #define PCIE_PHY_DCC_FEEDBACK 0x014 | ||
72 | #define PCIE_PHY_PLL_DIV_1 0x05c | ||
73 | #define PCIE_PHY_COMMON_POWER 0x064 | ||
74 | #define PCIE_PHY_COMMON_PD_CMN BIT(3) | ||
75 | #define PCIE_PHY_TRSV0_EMP_LVL 0x084 | ||
76 | #define PCIE_PHY_TRSV0_DRV_LVL 0x088 | ||
77 | #define PCIE_PHY_TRSV0_RXCDR 0x0ac | ||
78 | #define PCIE_PHY_TRSV0_POWER 0x0c4 | ||
79 | #define PCIE_PHY_TRSV0_PD_TSV BIT(7) | ||
80 | #define PCIE_PHY_TRSV0_LVCC 0x0dc | ||
81 | #define PCIE_PHY_TRSV1_EMP_LVL 0x144 | ||
82 | #define PCIE_PHY_TRSV1_RXCDR 0x16c | ||
83 | #define PCIE_PHY_TRSV1_POWER 0x184 | ||
84 | #define PCIE_PHY_TRSV1_PD_TSV BIT(7) | ||
85 | #define PCIE_PHY_TRSV1_LVCC 0x19c | ||
86 | #define PCIE_PHY_TRSV2_EMP_LVL 0x204 | ||
87 | #define PCIE_PHY_TRSV2_RXCDR 0x22c | ||
88 | #define PCIE_PHY_TRSV2_POWER 0x244 | ||
89 | #define PCIE_PHY_TRSV2_PD_TSV BIT(7) | ||
90 | #define PCIE_PHY_TRSV2_LVCC 0x25c | ||
91 | #define PCIE_PHY_TRSV3_EMP_LVL 0x2c4 | ||
92 | #define PCIE_PHY_TRSV3_RXCDR 0x2ec | ||
93 | #define PCIE_PHY_TRSV3_POWER 0x304 | ||
94 | #define PCIE_PHY_TRSV3_PD_TSV BIT(7) | ||
95 | #define PCIE_PHY_TRSV3_LVCC 0x31c | ||
96 | |||
97 | struct exynos_pcie_mem_res { | 55 | struct exynos_pcie_mem_res { |
98 | void __iomem *elbi_base; /* DT 0th resource: PCIe CTRL */ | 56 | void __iomem *elbi_base; /* DT 0th resource: PCIe CTRL */ |
99 | void __iomem *phy_base; /* DT 1st resource: PHY CTRL */ | ||
100 | void __iomem *block_base; /* DT 2nd resource: PHY ADDITIONAL CTRL */ | ||
101 | }; | 57 | }; |
102 | 58 | ||
103 | struct exynos_pcie_clk_res { | 59 | struct exynos_pcie_clk_res { |
@@ -112,8 +68,6 @@ struct exynos_pcie { | |||
112 | const struct exynos_pcie_ops *ops; | 68 | const struct exynos_pcie_ops *ops; |
113 | int reset_gpio; | 69 | int reset_gpio; |
114 | 70 | ||
115 | /* For Generic PHY Framework */ | ||
116 | bool using_phy; | ||
117 | struct phy *phy; | 71 | struct phy *phy; |
118 | }; | 72 | }; |
119 | 73 | ||
@@ -141,20 +95,6 @@ static int exynos5440_pcie_get_mem_resources(struct platform_device *pdev, | |||
141 | if (IS_ERR(ep->mem_res->elbi_base)) | 95 | if (IS_ERR(ep->mem_res->elbi_base)) |
142 | return PTR_ERR(ep->mem_res->elbi_base); | 96 | return PTR_ERR(ep->mem_res->elbi_base); |
143 | 97 | ||
144 | /* If using the PHY framework, doesn't need to get other resource */ | ||
145 | if (ep->using_phy) | ||
146 | return 0; | ||
147 | |||
148 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | ||
149 | ep->mem_res->phy_base = devm_ioremap_resource(dev, res); | ||
150 | if (IS_ERR(ep->mem_res->phy_base)) | ||
151 | return PTR_ERR(ep->mem_res->phy_base); | ||
152 | |||
153 | res = platform_get_resource(pdev, IORESOURCE_MEM, 2); | ||
154 | ep->mem_res->block_base = devm_ioremap_resource(dev, res); | ||
155 | if (IS_ERR(ep->mem_res->block_base)) | ||
156 | return PTR_ERR(ep->mem_res->block_base); | ||
157 | |||
158 | return 0; | 98 | return 0; |
159 | } | 99 | } |
160 | 100 | ||
@@ -279,111 +219,6 @@ static void exynos_pcie_deassert_core_reset(struct exynos_pcie *ep) | |||
279 | exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_NONSTICKY_RESET); | 219 | exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_NONSTICKY_RESET); |
280 | exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_APP_INIT_RESET); | 220 | exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_APP_INIT_RESET); |
281 | exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_APP_INIT_RESET); | 221 | exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_APP_INIT_RESET); |
282 | exynos_pcie_writel(ep->mem_res->block_base, 1, PCIE_PHY_MAC_RESET); | ||
283 | } | ||
284 | |||
285 | static void exynos_pcie_assert_phy_reset(struct exynos_pcie *ep) | ||
286 | { | ||
287 | exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_MAC_RESET); | ||
288 | exynos_pcie_writel(ep->mem_res->block_base, 1, PCIE_PHY_GLOBAL_RESET); | ||
289 | } | ||
290 | |||
291 | static void exynos_pcie_deassert_phy_reset(struct exynos_pcie *ep) | ||
292 | { | ||
293 | exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_GLOBAL_RESET); | ||
294 | exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_PWR_RESET); | ||
295 | exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_COMMON_RESET); | ||
296 | exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_CMN_REG); | ||
297 | exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_TRSVREG_RESET); | ||
298 | exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_TRSV_RESET); | ||
299 | } | ||
300 | |||
301 | static void exynos_pcie_power_on_phy(struct exynos_pcie *ep) | ||
302 | { | ||
303 | u32 val; | ||
304 | |||
305 | val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_COMMON_POWER); | ||
306 | val &= ~PCIE_PHY_COMMON_PD_CMN; | ||
307 | exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_COMMON_POWER); | ||
308 | |||
309 | val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV0_POWER); | ||
310 | val &= ~PCIE_PHY_TRSV0_PD_TSV; | ||
311 | exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV0_POWER); | ||
312 | |||
313 | val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV1_POWER); | ||
314 | val &= ~PCIE_PHY_TRSV1_PD_TSV; | ||
315 | exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV1_POWER); | ||
316 | |||
317 | val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV2_POWER); | ||
318 | val &= ~PCIE_PHY_TRSV2_PD_TSV; | ||
319 | exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV2_POWER); | ||
320 | |||
321 | val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV3_POWER); | ||
322 | val &= ~PCIE_PHY_TRSV3_PD_TSV; | ||
323 | exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV3_POWER); | ||
324 | } | ||
325 | |||
326 | static void exynos_pcie_power_off_phy(struct exynos_pcie *ep) | ||
327 | { | ||
328 | u32 val; | ||
329 | |||
330 | val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_COMMON_POWER); | ||
331 | val |= PCIE_PHY_COMMON_PD_CMN; | ||
332 | exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_COMMON_POWER); | ||
333 | |||
334 | val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV0_POWER); | ||
335 | val |= PCIE_PHY_TRSV0_PD_TSV; | ||
336 | exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV0_POWER); | ||
337 | |||
338 | val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV1_POWER); | ||
339 | val |= PCIE_PHY_TRSV1_PD_TSV; | ||
340 | exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV1_POWER); | ||
341 | |||
342 | val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV2_POWER); | ||
343 | val |= PCIE_PHY_TRSV2_PD_TSV; | ||
344 | exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV2_POWER); | ||
345 | |||
346 | val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV3_POWER); | ||
347 | val |= PCIE_PHY_TRSV3_PD_TSV; | ||
348 | exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV3_POWER); | ||
349 | } | ||
350 | |||
351 | static void exynos_pcie_init_phy(struct exynos_pcie *ep) | ||
352 | { | ||
353 | /* DCC feedback control off */ | ||
354 | exynos_pcie_writel(ep->mem_res->phy_base, 0x29, PCIE_PHY_DCC_FEEDBACK); | ||
355 | |||
356 | /* set TX/RX impedance */ | ||
357 | exynos_pcie_writel(ep->mem_res->phy_base, 0xd5, PCIE_PHY_IMPEDANCE); | ||
358 | |||
359 | /* set 50Mhz PHY clock */ | ||
360 | exynos_pcie_writel(ep->mem_res->phy_base, 0x14, PCIE_PHY_PLL_DIV_0); | ||
361 | exynos_pcie_writel(ep->mem_res->phy_base, 0x12, PCIE_PHY_PLL_DIV_1); | ||
362 | |||
363 | /* set TX Differential output for lane 0 */ | ||
364 | exynos_pcie_writel(ep->mem_res->phy_base, 0x7f, PCIE_PHY_TRSV0_DRV_LVL); | ||
365 | |||
366 | /* set TX Pre-emphasis Level Control for lane 0 to minimum */ | ||
367 | exynos_pcie_writel(ep->mem_res->phy_base, 0x0, PCIE_PHY_TRSV0_EMP_LVL); | ||
368 | |||
369 | /* set RX clock and data recovery bandwidth */ | ||
370 | exynos_pcie_writel(ep->mem_res->phy_base, 0xe7, PCIE_PHY_PLL_BIAS); | ||
371 | exynos_pcie_writel(ep->mem_res->phy_base, 0x82, PCIE_PHY_TRSV0_RXCDR); | ||
372 | exynos_pcie_writel(ep->mem_res->phy_base, 0x82, PCIE_PHY_TRSV1_RXCDR); | ||
373 | exynos_pcie_writel(ep->mem_res->phy_base, 0x82, PCIE_PHY_TRSV2_RXCDR); | ||
374 | exynos_pcie_writel(ep->mem_res->phy_base, 0x82, PCIE_PHY_TRSV3_RXCDR); | ||
375 | |||
376 | /* change TX Pre-emphasis Level Control for lanes */ | ||
377 | exynos_pcie_writel(ep->mem_res->phy_base, 0x39, PCIE_PHY_TRSV0_EMP_LVL); | ||
378 | exynos_pcie_writel(ep->mem_res->phy_base, 0x39, PCIE_PHY_TRSV1_EMP_LVL); | ||
379 | exynos_pcie_writel(ep->mem_res->phy_base, 0x39, PCIE_PHY_TRSV2_EMP_LVL); | ||
380 | exynos_pcie_writel(ep->mem_res->phy_base, 0x39, PCIE_PHY_TRSV3_EMP_LVL); | ||
381 | |||
382 | /* set LVCC */ | ||
383 | exynos_pcie_writel(ep->mem_res->phy_base, 0x20, PCIE_PHY_TRSV0_LVCC); | ||
384 | exynos_pcie_writel(ep->mem_res->phy_base, 0xa0, PCIE_PHY_TRSV1_LVCC); | ||
385 | exynos_pcie_writel(ep->mem_res->phy_base, 0xa0, PCIE_PHY_TRSV2_LVCC); | ||
386 | exynos_pcie_writel(ep->mem_res->phy_base, 0xa0, PCIE_PHY_TRSV3_LVCC); | ||
387 | } | 222 | } |
388 | 223 | ||
389 | static void exynos_pcie_assert_reset(struct exynos_pcie *ep) | 224 | static void exynos_pcie_assert_reset(struct exynos_pcie *ep) |
@@ -401,7 +236,6 @@ static int exynos_pcie_establish_link(struct exynos_pcie *ep) | |||
401 | struct dw_pcie *pci = ep->pci; | 236 | struct dw_pcie *pci = ep->pci; |
402 | struct pcie_port *pp = &pci->pp; | 237 | struct pcie_port *pp = &pci->pp; |
403 | struct device *dev = pci->dev; | 238 | struct device *dev = pci->dev; |
404 | u32 val; | ||
405 | 239 | ||
406 | if (dw_pcie_link_up(pci)) { | 240 | if (dw_pcie_link_up(pci)) { |
407 | dev_err(dev, "Link already up\n"); | 241 | dev_err(dev, "Link already up\n"); |
@@ -410,32 +244,13 @@ static int exynos_pcie_establish_link(struct exynos_pcie *ep) | |||
410 | 244 | ||
411 | exynos_pcie_assert_core_reset(ep); | 245 | exynos_pcie_assert_core_reset(ep); |
412 | 246 | ||
413 | if (ep->using_phy) { | 247 | phy_reset(ep->phy); |
414 | phy_reset(ep->phy); | ||
415 | |||
416 | exynos_pcie_writel(ep->mem_res->elbi_base, 1, | ||
417 | PCIE_PWR_RESET); | ||
418 | |||
419 | phy_power_on(ep->phy); | ||
420 | phy_init(ep->phy); | ||
421 | } else { | ||
422 | exynos_pcie_assert_phy_reset(ep); | ||
423 | exynos_pcie_deassert_phy_reset(ep); | ||
424 | exynos_pcie_power_on_phy(ep); | ||
425 | exynos_pcie_init_phy(ep); | ||
426 | |||
427 | /* pulse for common reset */ | ||
428 | exynos_pcie_writel(ep->mem_res->block_base, 1, | ||
429 | PCIE_PHY_COMMON_RESET); | ||
430 | udelay(500); | ||
431 | exynos_pcie_writel(ep->mem_res->block_base, 0, | ||
432 | PCIE_PHY_COMMON_RESET); | ||
433 | } | ||
434 | 248 | ||
435 | /* pulse for common reset */ | 249 | exynos_pcie_writel(ep->mem_res->elbi_base, 1, |
436 | exynos_pcie_writel(ep->mem_res->block_base, 1, PCIE_PHY_COMMON_RESET); | 250 | PCIE_PWR_RESET); |
437 | udelay(500); | 251 | |
438 | exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_COMMON_RESET); | 252 | phy_power_on(ep->phy); |
253 | phy_init(ep->phy); | ||
439 | 254 | ||
440 | exynos_pcie_deassert_core_reset(ep); | 255 | exynos_pcie_deassert_core_reset(ep); |
441 | dw_pcie_setup_rc(pp); | 256 | dw_pcie_setup_rc(pp); |
@@ -449,18 +264,7 @@ static int exynos_pcie_establish_link(struct exynos_pcie *ep) | |||
449 | if (!dw_pcie_wait_for_link(pci)) | 264 | if (!dw_pcie_wait_for_link(pci)) |
450 | return 0; | 265 | return 0; |
451 | 266 | ||
452 | if (ep->using_phy) { | 267 | phy_power_off(ep->phy); |
453 | phy_power_off(ep->phy); | ||
454 | return -ETIMEDOUT; | ||
455 | } | ||
456 | |||
457 | while (exynos_pcie_readl(ep->mem_res->phy_base, | ||
458 | PCIE_PHY_PLL_LOCKED) == 0) { | ||
459 | val = exynos_pcie_readl(ep->mem_res->block_base, | ||
460 | PCIE_PHY_PLL_LOCKED); | ||
461 | dev_info(dev, "PLL Locked: 0x%x\n", val); | ||
462 | } | ||
463 | exynos_pcie_power_off_phy(ep); | ||
464 | return -ETIMEDOUT; | 268 | return -ETIMEDOUT; |
465 | } | 269 | } |
466 | 270 | ||
@@ -678,16 +482,13 @@ static int __init exynos_pcie_probe(struct platform_device *pdev) | |||
678 | 482 | ||
679 | ep->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0); | 483 | ep->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0); |
680 | 484 | ||
681 | /* Assume that controller doesn't use the PHY framework */ | ||
682 | ep->using_phy = false; | ||
683 | |||
684 | ep->phy = devm_of_phy_get(dev, np, NULL); | 485 | ep->phy = devm_of_phy_get(dev, np, NULL); |
685 | if (IS_ERR(ep->phy)) { | 486 | if (IS_ERR(ep->phy)) { |
686 | if (PTR_ERR(ep->phy) == -EPROBE_DEFER) | 487 | if (PTR_ERR(ep->phy) == -EPROBE_DEFER) |
687 | return PTR_ERR(ep->phy); | 488 | return PTR_ERR(ep->phy); |
688 | dev_warn(dev, "Use the 'phy' property. Current DT of pci-exynos was deprecated!!\n"); | 489 | |
689 | } else | 490 | ep->phy = NULL; |
690 | ep->using_phy = true; | 491 | } |
691 | 492 | ||
692 | if (ep->ops && ep->ops->get_mem_resources) { | 493 | if (ep->ops && ep->ops->get_mem_resources) { |
693 | ret = ep->ops->get_mem_resources(pdev, ep); | 494 | ret = ep->ops->get_mem_resources(pdev, ep); |
@@ -695,7 +496,8 @@ static int __init exynos_pcie_probe(struct platform_device *pdev) | |||
695 | return ret; | 496 | return ret; |
696 | } | 497 | } |
697 | 498 | ||
698 | if (ep->ops && ep->ops->get_clk_resources) { | 499 | if (ep->ops && ep->ops->get_clk_resources && |
500 | ep->ops->init_clk_resources) { | ||
699 | ret = ep->ops->get_clk_resources(ep); | 501 | ret = ep->ops->get_clk_resources(ep); |
700 | if (ret) | 502 | if (ret) |
701 | return ret; | 503 | return ret; |
@@ -713,8 +515,7 @@ static int __init exynos_pcie_probe(struct platform_device *pdev) | |||
713 | return 0; | 515 | return 0; |
714 | 516 | ||
715 | fail_probe: | 517 | fail_probe: |
716 | if (ep->using_phy) | 518 | phy_exit(ep->phy); |
717 | phy_exit(ep->phy); | ||
718 | 519 | ||
719 | if (ep->ops && ep->ops->deinit_clk_resources) | 520 | if (ep->ops && ep->ops->deinit_clk_resources) |
720 | ep->ops->deinit_clk_resources(ep); | 521 | ep->ops->deinit_clk_resources(ep); |