Commit | Line | Data |
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166bac38 JG |
1 | /* |
2 | * Driver for MMC and SSD cards for Cavium ThunderX SOCs. | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | * | |
8 | * Copyright (C) 2016 Cavium Inc. | |
9 | */ | |
b917c6d1 | 10 | #include <linux/device.h> |
166bac38 JG |
11 | #include <linux/dma-mapping.h> |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/mmc/mmc.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/of_platform.h> | |
17 | #include <linux/pci.h> | |
18 | #include "cavium.h" | |
19 | ||
20 | static void thunder_mmc_acquire_bus(struct cvm_mmc_host *host) | |
21 | { | |
22 | down(&host->mmc_serializer); | |
23 | } | |
24 | ||
25 | static void thunder_mmc_release_bus(struct cvm_mmc_host *host) | |
26 | { | |
27 | up(&host->mmc_serializer); | |
28 | } | |
29 | ||
30 | static void thunder_mmc_int_enable(struct cvm_mmc_host *host, u64 val) | |
31 | { | |
32 | writeq(val, host->base + MIO_EMM_INT(host)); | |
33 | writeq(val, host->base + MIO_EMM_INT_EN_SET(host)); | |
34 | } | |
35 | ||
36 | static int thunder_mmc_register_interrupts(struct cvm_mmc_host *host, | |
37 | struct pci_dev *pdev) | |
38 | { | |
39 | int nvec, ret, i; | |
40 | ||
41 | nvec = pci_alloc_irq_vectors(pdev, 1, 9, PCI_IRQ_MSIX); | |
42 | if (nvec < 0) | |
43 | return nvec; | |
44 | ||
45 | /* register interrupts */ | |
46 | for (i = 0; i < nvec; i++) { | |
47 | ret = devm_request_irq(&pdev->dev, pci_irq_vector(pdev, i), | |
48 | cvm_mmc_interrupt, | |
49 | 0, cvm_mmc_irq_names[i], host); | |
50 | if (ret) | |
51 | return ret; | |
52 | } | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static int thunder_mmc_probe(struct pci_dev *pdev, | |
57 | const struct pci_device_id *id) | |
58 | { | |
59 | struct device_node *node = pdev->dev.of_node; | |
60 | struct device *dev = &pdev->dev; | |
61 | struct device_node *child_node; | |
62 | struct cvm_mmc_host *host; | |
63 | int ret, i = 0; | |
64 | ||
65 | host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL); | |
66 | if (!host) | |
67 | return -ENOMEM; | |
68 | ||
69 | pci_set_drvdata(pdev, host); | |
70 | ret = pcim_enable_device(pdev); | |
71 | if (ret) | |
72 | return ret; | |
73 | ||
74 | ret = pci_request_regions(pdev, KBUILD_MODNAME); | |
75 | if (ret) | |
76 | return ret; | |
77 | ||
78 | host->base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0)); | |
79 | if (!host->base) | |
80 | return -EINVAL; | |
81 | ||
82 | /* On ThunderX these are identical */ | |
83 | host->dma_base = host->base; | |
84 | ||
85 | host->reg_off = 0x2000; | |
cd76e5c5 | 86 | host->reg_off_dma = 0x160; |
166bac38 JG |
87 | |
88 | host->clk = devm_clk_get(dev, NULL); | |
89 | if (IS_ERR(host->clk)) | |
90 | return PTR_ERR(host->clk); | |
91 | ||
92 | ret = clk_prepare_enable(host->clk); | |
93 | if (ret) | |
94 | return ret; | |
95 | host->sys_freq = clk_get_rate(host->clk); | |
96 | ||
97 | spin_lock_init(&host->irq_handler_lock); | |
98 | sema_init(&host->mmc_serializer, 1); | |
99 | ||
100 | host->dev = dev; | |
101 | host->acquire_bus = thunder_mmc_acquire_bus; | |
102 | host->release_bus = thunder_mmc_release_bus; | |
103 | host->int_enable = thunder_mmc_int_enable; | |
104 | ||
cd76e5c5 | 105 | host->use_sg = true; |
166bac38 JG |
106 | host->big_dma_addr = true; |
107 | host->need_irq_handler_lock = true; | |
108 | host->last_slot = -1; | |
109 | ||
110 | ret = dma_set_mask(dev, DMA_BIT_MASK(48)); | |
111 | if (ret) | |
112 | goto error; | |
113 | ||
114 | /* | |
115 | * Clear out any pending interrupts that may be left over from | |
116 | * bootloader. Writing 1 to the bits clears them. | |
117 | */ | |
118 | writeq(127, host->base + MIO_EMM_INT_EN(host)); | |
119 | writeq(3, host->base + MIO_EMM_DMA_INT_ENA_W1C(host)); | |
cd76e5c5 JG |
120 | /* Clear DMA FIFO */ |
121 | writeq(BIT_ULL(16), host->base + MIO_EMM_DMA_FIFO_CFG(host)); | |
166bac38 JG |
122 | |
123 | ret = thunder_mmc_register_interrupts(host, pdev); | |
124 | if (ret) | |
125 | goto error; | |
126 | ||
127 | for_each_child_of_node(node, child_node) { | |
128 | /* | |
129 | * mmc_of_parse and devm* require one device per slot. | |
130 | * Create a dummy device per slot and set the node pointer to | |
131 | * the slot. The easiest way to get this is using | |
132 | * of_platform_device_create. | |
133 | */ | |
134 | if (of_device_is_compatible(child_node, "mmc-slot")) { | |
135 | host->slot_pdev[i] = of_platform_device_create(child_node, NULL, | |
136 | &pdev->dev); | |
137 | if (!host->slot_pdev[i]) | |
138 | continue; | |
139 | ||
140 | ret = cvm_mmc_of_slot_probe(&host->slot_pdev[i]->dev, host); | |
141 | if (ret) | |
142 | goto error; | |
143 | } | |
144 | i++; | |
145 | } | |
146 | dev_info(dev, "probed\n"); | |
147 | return 0; | |
148 | ||
149 | error: | |
8fb83b14 JG |
150 | for (i = 0; i < CAVIUM_MAX_MMC; i++) { |
151 | if (host->slot[i]) | |
152 | cvm_mmc_of_slot_remove(host->slot[i]); | |
b917c6d1 JG |
153 | if (host->slot_pdev[i]) { |
154 | get_device(&host->slot_pdev[i]->dev); | |
8fb83b14 | 155 | of_platform_device_destroy(&host->slot_pdev[i]->dev, NULL); |
b917c6d1 JG |
156 | put_device(&host->slot_pdev[i]->dev); |
157 | } | |
8fb83b14 | 158 | } |
166bac38 JG |
159 | clk_disable_unprepare(host->clk); |
160 | return ret; | |
161 | } | |
162 | ||
163 | static void thunder_mmc_remove(struct pci_dev *pdev) | |
164 | { | |
165 | struct cvm_mmc_host *host = pci_get_drvdata(pdev); | |
166 | u64 dma_cfg; | |
167 | int i; | |
168 | ||
169 | for (i = 0; i < CAVIUM_MAX_MMC; i++) | |
170 | if (host->slot[i]) | |
171 | cvm_mmc_of_slot_remove(host->slot[i]); | |
172 | ||
173 | dma_cfg = readq(host->dma_base + MIO_EMM_DMA_CFG(host)); | |
174 | dma_cfg &= ~MIO_EMM_DMA_CFG_EN; | |
175 | writeq(dma_cfg, host->dma_base + MIO_EMM_DMA_CFG(host)); | |
176 | ||
177 | clk_disable_unprepare(host->clk); | |
178 | } | |
179 | ||
180 | static const struct pci_device_id thunder_mmc_id_table[] = { | |
181 | { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa010) }, | |
182 | { 0, } /* end of table */ | |
183 | }; | |
184 | ||
185 | static struct pci_driver thunder_mmc_driver = { | |
186 | .name = KBUILD_MODNAME, | |
187 | .id_table = thunder_mmc_id_table, | |
188 | .probe = thunder_mmc_probe, | |
189 | .remove = thunder_mmc_remove, | |
190 | }; | |
191 | ||
dfc28b11 | 192 | module_pci_driver(thunder_mmc_driver); |
166bac38 JG |
193 | |
194 | MODULE_AUTHOR("Cavium Inc."); | |
195 | MODULE_DESCRIPTION("Cavium ThunderX eMMC Driver"); | |
196 | MODULE_LICENSE("GPL"); | |
197 | MODULE_DEVICE_TABLE(pci, thunder_mmc_id_table); |