1 /* Copyright (c) 2009 - 2016 Freescale Semiconductor, Inc.
2  *
3  * Redistribution and use in source and binary forms, with or without
4  * modification, are permitted provided that the following conditions are met:
5  *     * Redistributions of source code must retain the above copyright
6  *	 notice, this list of conditions and the following disclaimer.
7  *     * Redistributions in binary form must reproduce the above copyright
8  *	 notice, this list of conditions and the following disclaimer in the
9  *	 documentation and/or other materials provided with the distribution.
10  *     * Neither the name of Freescale Semiconductor nor the
11  *	 names of its contributors may be used to endorse or promote products
12  *	 derived from this software without specific prior written permission.
13  *
14  * ALTERNATIVELY, this software may be distributed under the terms of the
15  * GNU General Public License ("GPL") as published by the Free Software
16  * Foundation, either version 2 of that License or (at your option) any
17  * later version.
18  *
19  * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
20  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22  * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #include "bman_priv.h"
32 
33 u16 bman_ip_rev;
34 EXPORT_SYMBOL(bman_ip_rev);
35 
36 /* Register offsets */
37 #define REG_FBPR_FPC		0x0800
38 #define REG_ECSR		0x0a00
39 #define REG_ECIR		0x0a04
40 #define REG_EADR		0x0a08
41 #define REG_EDATA(n)		(0x0a10 + ((n) * 0x04))
42 #define REG_SBEC(n)		(0x0a80 + ((n) * 0x04))
43 #define REG_IP_REV_1		0x0bf8
44 #define REG_IP_REV_2		0x0bfc
45 #define REG_FBPR_BARE		0x0c00
46 #define REG_FBPR_BAR		0x0c04
47 #define REG_FBPR_AR		0x0c10
48 #define REG_SRCIDR		0x0d04
49 #define REG_LIODNR		0x0d08
50 #define REG_ERR_ISR		0x0e00
51 #define REG_ERR_IER		0x0e04
52 #define REG_ERR_ISDR		0x0e08
53 
54 /* Used by all error interrupt registers except 'inhibit' */
55 #define BM_EIRQ_IVCI	0x00000010	/* Invalid Command Verb */
56 #define BM_EIRQ_FLWI	0x00000008	/* FBPR Low Watermark */
57 #define BM_EIRQ_MBEI	0x00000004	/* Multi-bit ECC Error */
58 #define BM_EIRQ_SBEI	0x00000002	/* Single-bit ECC Error */
59 #define BM_EIRQ_BSCN	0x00000001	/* pool State Change Notification */
60 
61 struct bman_hwerr_txt {
62 	u32 mask;
63 	const char *txt;
64 };
65 
66 static const struct bman_hwerr_txt bman_hwerr_txts[] = {
67 	{ BM_EIRQ_IVCI, "Invalid Command Verb" },
68 	{ BM_EIRQ_FLWI, "FBPR Low Watermark" },
69 	{ BM_EIRQ_MBEI, "Multi-bit ECC Error" },
70 	{ BM_EIRQ_SBEI, "Single-bit ECC Error" },
71 	{ BM_EIRQ_BSCN, "Pool State Change Notification" },
72 };
73 
74 /* Only trigger low water mark interrupt once only */
75 #define BMAN_ERRS_TO_DISABLE BM_EIRQ_FLWI
76 
77 /* Pointer to the start of the BMan's CCSR space */
78 static u32 __iomem *bm_ccsr_start;
79 
bm_ccsr_in(u32 offset)80 static inline u32 bm_ccsr_in(u32 offset)
81 {
82 	return ioread32be(bm_ccsr_start + offset/4);
83 }
bm_ccsr_out(u32 offset,u32 val)84 static inline void bm_ccsr_out(u32 offset, u32 val)
85 {
86 	iowrite32be(val, bm_ccsr_start + offset/4);
87 }
88 
bm_get_version(u16 * id,u8 * major,u8 * minor)89 static void bm_get_version(u16 *id, u8 *major, u8 *minor)
90 {
91 	u32 v = bm_ccsr_in(REG_IP_REV_1);
92 	*id = (v >> 16);
93 	*major = (v >> 8) & 0xff;
94 	*minor = v & 0xff;
95 }
96 
97 /* signal transactions for FBPRs with higher priority */
98 #define FBPR_AR_RPRIO_HI BIT(30)
99 
100 /* Track if probe has occurred and if cleanup is required */
101 static int __bman_probed;
102 static int __bman_requires_cleanup;
103 
104 
bm_set_memory(u64 ba,u32 size)105 static int bm_set_memory(u64 ba, u32 size)
106 {
107 	u32 bar, bare;
108 	u32 exp = ilog2(size);
109 	/* choke if size isn't within range */
110 	DPAA_ASSERT(size >= 4096 && size <= 1024*1024*1024 &&
111 		   is_power_of_2(size));
112 	/* choke if '[e]ba' has lower-alignment than 'size' */
113 	DPAA_ASSERT(!(ba & (size - 1)));
114 
115 	/* Check to see if BMan has already been initialized */
116 	bar = bm_ccsr_in(REG_FBPR_BAR);
117 	if (bar) {
118 		/* Maker sure ba == what was programmed) */
119 		bare = bm_ccsr_in(REG_FBPR_BARE);
120 		if (bare != upper_32_bits(ba) || bar != lower_32_bits(ba)) {
121 			pr_err("Attempted to reinitialize BMan with different BAR, got 0x%llx read BARE=0x%x BAR=0x%x\n",
122 			       ba, bare, bar);
123 			return -ENOMEM;
124 		}
125 		pr_info("BMan BAR already configured\n");
126 		__bman_requires_cleanup = 1;
127 		return 1;
128 	}
129 
130 	bm_ccsr_out(REG_FBPR_BARE, upper_32_bits(ba));
131 	bm_ccsr_out(REG_FBPR_BAR, lower_32_bits(ba));
132 	bm_ccsr_out(REG_FBPR_AR, exp - 1);
133 	return 0;
134 }
135 
136 /*
137  * Location and size of BMan private memory
138  *
139  * Ideally we would use the DMA API to turn rmem->base into a DMA address
140  * (especially if iommu translations ever get involved).  Unfortunately, the
141  * DMA API currently does not allow mapping anything that is not backed with
142  * a struct page.
143  */
144 static dma_addr_t fbpr_a;
145 static size_t fbpr_sz;
146 
bman_fbpr(struct reserved_mem * rmem)147 static int bman_fbpr(struct reserved_mem *rmem)
148 {
149 	fbpr_a = rmem->base;
150 	fbpr_sz = rmem->size;
151 
152 	WARN_ON(!(fbpr_a && fbpr_sz));
153 
154 	return 0;
155 }
156 RESERVEDMEM_OF_DECLARE(bman_fbpr, "fsl,bman-fbpr", bman_fbpr);
157 
bman_isr(int irq,void * ptr)158 static irqreturn_t bman_isr(int irq, void *ptr)
159 {
160 	u32 isr_val, ier_val, ecsr_val, isr_mask, i;
161 	struct device *dev = ptr;
162 
163 	ier_val = bm_ccsr_in(REG_ERR_IER);
164 	isr_val = bm_ccsr_in(REG_ERR_ISR);
165 	ecsr_val = bm_ccsr_in(REG_ECSR);
166 	isr_mask = isr_val & ier_val;
167 
168 	if (!isr_mask)
169 		return IRQ_NONE;
170 
171 	for (i = 0; i < ARRAY_SIZE(bman_hwerr_txts); i++) {
172 		if (bman_hwerr_txts[i].mask & isr_mask) {
173 			dev_err_ratelimited(dev, "ErrInt: %s\n",
174 					    bman_hwerr_txts[i].txt);
175 			if (bman_hwerr_txts[i].mask & ecsr_val) {
176 				/* Re-arm error capture registers */
177 				bm_ccsr_out(REG_ECSR, ecsr_val);
178 			}
179 			if (bman_hwerr_txts[i].mask & BMAN_ERRS_TO_DISABLE) {
180 				dev_dbg(dev, "Disabling error 0x%x\n",
181 					bman_hwerr_txts[i].mask);
182 				ier_val &= ~bman_hwerr_txts[i].mask;
183 				bm_ccsr_out(REG_ERR_IER, ier_val);
184 			}
185 		}
186 	}
187 	bm_ccsr_out(REG_ERR_ISR, isr_val);
188 
189 	return IRQ_HANDLED;
190 }
191 
bman_is_probed(void)192 int bman_is_probed(void)
193 {
194 	return __bman_probed;
195 }
196 EXPORT_SYMBOL_GPL(bman_is_probed);
197 
bman_requires_cleanup(void)198 int bman_requires_cleanup(void)
199 {
200 	return __bman_requires_cleanup;
201 }
202 
bman_done_cleanup(void)203 void bman_done_cleanup(void)
204 {
205 	__bman_requires_cleanup = 0;
206 }
207 
fsl_bman_probe(struct platform_device * pdev)208 static int fsl_bman_probe(struct platform_device *pdev)
209 {
210 	int ret, err_irq;
211 	struct device *dev = &pdev->dev;
212 	struct device_node *node = dev->of_node;
213 	struct resource *res;
214 	u16 id, bm_pool_cnt;
215 	u8 major, minor;
216 
217 	__bman_probed = -1;
218 
219 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
220 	if (!res) {
221 		dev_err(dev, "Can't get %pOF property 'IORESOURCE_MEM'\n",
222 			node);
223 		return -ENXIO;
224 	}
225 	bm_ccsr_start = devm_ioremap(dev, res->start, resource_size(res));
226 	if (!bm_ccsr_start)
227 		return -ENXIO;
228 
229 	bm_get_version(&id, &major, &minor);
230 	if (major == 1 && minor == 0) {
231 		bman_ip_rev = BMAN_REV10;
232 		bm_pool_cnt = BM_POOL_MAX;
233 	} else if (major == 2 && minor == 0) {
234 		bman_ip_rev = BMAN_REV20;
235 		bm_pool_cnt = 8;
236 	} else if (major == 2 && minor == 1) {
237 		bman_ip_rev = BMAN_REV21;
238 		bm_pool_cnt = BM_POOL_MAX;
239 	} else {
240 		dev_err(dev, "Unknown Bman version:%04x,%02x,%02x\n",
241 			id, major, minor);
242 		return -ENODEV;
243 	}
244 
245 	/*
246 	 * If FBPR memory wasn't defined using the qbman compatible string
247 	 * try using the of_reserved_mem_device method
248 	 */
249 	if (!fbpr_a) {
250 		ret = qbman_init_private_mem(dev, 0, &fbpr_a, &fbpr_sz);
251 		if (ret) {
252 			dev_err(dev, "qbman_init_private_mem() failed 0x%x\n",
253 				ret);
254 			return -ENODEV;
255 		}
256 	}
257 
258 	dev_dbg(dev, "Allocated FBPR 0x%llx 0x%zx\n", fbpr_a, fbpr_sz);
259 
260 	bm_set_memory(fbpr_a, fbpr_sz);
261 
262 	err_irq = platform_get_irq(pdev, 0);
263 	if (err_irq <= 0) {
264 		dev_info(dev, "Can't get %pOF IRQ\n", node);
265 		return -ENODEV;
266 	}
267 	ret = devm_request_irq(dev, err_irq, bman_isr, IRQF_SHARED, "bman-err",
268 			       dev);
269 	if (ret)  {
270 		dev_err(dev, "devm_request_irq() failed %d for '%pOF'\n",
271 			ret, node);
272 		return ret;
273 	}
274 	/* Disable Buffer Pool State Change */
275 	bm_ccsr_out(REG_ERR_ISDR, BM_EIRQ_BSCN);
276 	/*
277 	 * Write-to-clear any stale bits, (eg. starvation being asserted prior
278 	 * to resource allocation during driver init).
279 	 */
280 	bm_ccsr_out(REG_ERR_ISR, 0xffffffff);
281 	/* Enable Error Interrupts */
282 	bm_ccsr_out(REG_ERR_IER, 0xffffffff);
283 
284 	bm_bpalloc = devm_gen_pool_create(dev, 0, -1, "bman-bpalloc");
285 	if (IS_ERR(bm_bpalloc)) {
286 		ret = PTR_ERR(bm_bpalloc);
287 		dev_err(dev, "bman-bpalloc pool init failed (%d)\n", ret);
288 		return ret;
289 	}
290 
291 	/* seed BMan resource pool */
292 	ret = gen_pool_add(bm_bpalloc, DPAA_GENALLOC_OFF, bm_pool_cnt, -1);
293 	if (ret) {
294 		dev_err(dev, "Failed to seed BPID range [%d..%d] (%d)\n",
295 			0, bm_pool_cnt - 1, ret);
296 		return ret;
297 	}
298 
299 	__bman_probed = 1;
300 
301 	return 0;
302 };
303 
304 static const struct of_device_id fsl_bman_ids[] = {
305 	{
306 		.compatible = "fsl,bman",
307 	},
308 	{}
309 };
310 
311 static struct platform_driver fsl_bman_driver = {
312 	.driver = {
313 		.name = KBUILD_MODNAME,
314 		.of_match_table = fsl_bman_ids,
315 		.suppress_bind_attrs = true,
316 	},
317 	.probe = fsl_bman_probe,
318 };
319 
320 builtin_platform_driver(fsl_bman_driver);
321