1/*
2 * arch/arm/mach-netx/xc.c
3 *
4 * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18 */
19
20#include <linux/init.h>
21#include <linux/device.h>
22#include <linux/firmware.h>
23#include <linux/mutex.h>
24#include <linux/slab.h>
25#include <linux/io.h>
26#include <linux/export.h>
27
28#include <mach/hardware.h>
29#include <mach/irqs.h>
30#include <mach/netx-regs.h>
31
32#include <mach/xc.h>
33
34static DEFINE_MUTEX(xc_lock);
35
36static int xc_in_use = 0;
37
38struct fw_desc {
39	unsigned int ofs;
40	unsigned int size;
41	unsigned int patch_ofs;
42	unsigned int patch_entries;
43};
44
45struct fw_header {
46	unsigned int magic;
47	unsigned int type;
48	unsigned int version;
49	unsigned int reserved[5];
50	struct fw_desc fw_desc[3];
51} __attribute__ ((packed));
52
53int xc_stop(struct xc *x)
54{
55	writel(RPU_HOLD_PC, x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS);
56	writel(TPU_HOLD_PC, x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS);
57	writel(XPU_HOLD_PC, x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS);
58	return 0;
59}
60
61int xc_start(struct xc *x)
62{
63	writel(0, x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS);
64	writel(0, x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS);
65	writel(0, x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS);
66	return 0;
67}
68
69int xc_running(struct xc *x)
70{
71	return (readl(x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS) & RPU_HOLD_PC)
72	    || (readl(x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS) & TPU_HOLD_PC)
73	    || (readl(x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS) & XPU_HOLD_PC) ?
74		0 : 1;
75}
76
77int xc_reset(struct xc *x)
78{
79	writel(0, x->xpec_base + NETX_XPEC_PC_OFS);
80	return 0;
81}
82
83static int xc_check_ptr(struct xc *x, unsigned long adr, unsigned int size)
84{
85	if (adr >= NETX_PA_XMAC(x->no) &&
86	    adr + size < NETX_PA_XMAC(x->no) + XMAC_MEM_SIZE)
87		return 0;
88
89	if (adr >= NETX_PA_XPEC(x->no) &&
90	    adr + size < NETX_PA_XPEC(x->no) + XPEC_MEM_SIZE)
91		return 0;
92
93	dev_err(x->dev, "Illegal pointer in firmware found. aborting\n");
94
95	return -1;
96}
97
98static int xc_patch(struct xc *x, const void *patch, int count)
99{
100	unsigned int val, adr;
101	const unsigned int *data = patch;
102
103	int i;
104	for (i = 0; i < count; i++) {
105		adr = *data++;
106		val = *data++;
107		if (xc_check_ptr(x, adr, 4) < 0)
108			return -EINVAL;
109
110		writel(val, (void __iomem *)io_p2v(adr));
111	}
112	return 0;
113}
114
115int xc_request_firmware(struct xc *x)
116{
117	int ret;
118	char name[16];
119	const struct firmware *fw;
120	struct fw_header *head;
121	unsigned int size;
122	int i;
123	const void *src;
124	unsigned long dst;
125
126	sprintf(name, "xc%d.bin", x->no);
127
128	ret = request_firmware(&fw, name, x->dev);
129
130	if (ret < 0) {
131		dev_err(x->dev, "request_firmware failed\n");
132		return ret;
133	}
134
135	head = (struct fw_header *)fw->data;
136	if (head->magic != 0x4e657458) {
137		if (head->magic == 0x5874654e) {
138			dev_err(x->dev,
139			    "firmware magic is 'XteN'. Endianness problems?\n");
140			ret = -ENODEV;
141			goto exit_release_firmware;
142		}
143		dev_err(x->dev, "unrecognized firmware magic 0x%08x\n",
144			head->magic);
145		ret = -ENODEV;
146		goto exit_release_firmware;
147	}
148
149	x->type = head->type;
150	x->version = head->version;
151
152	ret = -EINVAL;
153
154	for (i = 0; i < 3; i++) {
155		src = fw->data + head->fw_desc[i].ofs;
156		dst = *(unsigned int *)src;
157		src += sizeof (unsigned int);
158		size = head->fw_desc[i].size - sizeof (unsigned int);
159
160		if (xc_check_ptr(x, dst, size))
161			goto exit_release_firmware;
162
163		memcpy((void *)io_p2v(dst), src, size);
164
165		src = fw->data + head->fw_desc[i].patch_ofs;
166		size = head->fw_desc[i].patch_entries;
167		ret = xc_patch(x, src, size);
168		if (ret < 0)
169			goto exit_release_firmware;
170	}
171
172	ret = 0;
173
174      exit_release_firmware:
175	release_firmware(fw);
176
177	return ret;
178}
179
180struct xc *request_xc(int xcno, struct device *dev)
181{
182	struct xc *x = NULL;
183
184	mutex_lock(&xc_lock);
185
186	if (xcno > 3)
187		goto exit;
188	if (xc_in_use & (1 << xcno))
189		goto exit;
190
191	x = kmalloc(sizeof (struct xc), GFP_KERNEL);
192	if (!x)
193		goto exit;
194
195	if (!request_mem_region
196	    (NETX_PA_XPEC(xcno), XPEC_MEM_SIZE, kobject_name(&dev->kobj)))
197		goto exit_free;
198
199	if (!request_mem_region
200	    (NETX_PA_XMAC(xcno), XMAC_MEM_SIZE, kobject_name(&dev->kobj)))
201		goto exit_release_1;
202
203	if (!request_mem_region
204	    (SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE, kobject_name(&dev->kobj)))
205		goto exit_release_2;
206
207	x->xpec_base = (void * __iomem)io_p2v(NETX_PA_XPEC(xcno));
208	x->xmac_base = (void * __iomem)io_p2v(NETX_PA_XMAC(xcno));
209	x->sram_base = ioremap(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
210	if (!x->sram_base)
211		goto exit_release_3;
212
213	x->irq = NETX_IRQ_XPEC(xcno);
214
215	x->no = xcno;
216	x->dev = dev;
217
218	xc_in_use |= (1 << xcno);
219
220	goto exit;
221
222      exit_release_3:
223	release_mem_region(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
224      exit_release_2:
225	release_mem_region(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE);
226      exit_release_1:
227	release_mem_region(NETX_PA_XPEC(xcno), XPEC_MEM_SIZE);
228      exit_free:
229	kfree(x);
230	x = NULL;
231      exit:
232	mutex_unlock(&xc_lock);
233	return x;
234}
235
236void free_xc(struct xc *x)
237{
238	int xcno = x->no;
239
240	mutex_lock(&xc_lock);
241
242	iounmap(x->sram_base);
243	release_mem_region(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
244	release_mem_region(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE);
245	release_mem_region(NETX_PA_XPEC(xcno), XPEC_MEM_SIZE);
246	xc_in_use &= ~(1 << x->no);
247	kfree(x);
248
249	mutex_unlock(&xc_lock);
250}
251
252EXPORT_SYMBOL(free_xc);
253EXPORT_SYMBOL(request_xc);
254EXPORT_SYMBOL(xc_request_firmware);
255EXPORT_SYMBOL(xc_reset);
256EXPORT_SYMBOL(xc_running);
257EXPORT_SYMBOL(xc_start);
258EXPORT_SYMBOL(xc_stop);
259