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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/module.h>
3#include <linux/netdevice.h>
4#include <linux/platform_device.h>
5#include <linux/zorro.h>
6#include <net/ax88796.h>
7#include <asm/amigaints.h>
8
9#define ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF100 \
10 ZORRO_ID(INDIVIDUAL_COMPUTERS, 0x64, 0)
11
12#define XS100_IRQSTATUS_BASE 0x40
13#define XS100_8390_BASE 0x800
14
15/* Longword-access area. Translated to 2 16-bit access cycles by the
16 * X-Surf 100 FPGA
17 */
18#define XS100_8390_DATA32_BASE 0x8000
19#define XS100_8390_DATA32_SIZE 0x2000
20/* Sub-Areas for fast data register access; addresses relative to area begin */
21#define XS100_8390_DATA_READ32_BASE 0x0880
22#define XS100_8390_DATA_WRITE32_BASE 0x0C80
23#define XS100_8390_DATA_AREA_SIZE 0x80
24
25#define __NS8390_init ax_NS8390_init
26
27/* force unsigned long back to 'void __iomem *' */
28#define ax_convert_addr(_a) ((void __force __iomem *)(_a))
29
30#define ei_inb(_a) z_readb(ax_convert_addr(_a))
31#define ei_outb(_v, _a) z_writeb(_v, ax_convert_addr(_a))
32
33#define ei_inw(_a) z_readw(ax_convert_addr(_a))
34#define ei_outw(_v, _a) z_writew(_v, ax_convert_addr(_a))
35
36#define ei_inb_p(_a) ei_inb(_a)
37#define ei_outb_p(_v, _a) ei_outb(_v, _a)
38
39/* define EI_SHIFT() to take into account our register offsets */
40#define EI_SHIFT(x) (ei_local->reg_offset[(x)])
41
42/* Ensure we have our RCR base value */
43#define AX88796_PLATFORM
44
45static unsigned char version[] =
46 "ax88796.c: Copyright 2005,2007 Simtec Electronics\n";
47
48#include "lib8390.c"
49
50/* from ne.c */
51#define NE_CMD EI_SHIFT(0x00)
52#define NE_RESET EI_SHIFT(0x1f)
53#define NE_DATAPORT EI_SHIFT(0x10)
54
55struct xsurf100_ax_plat_data {
56 struct ax_plat_data ax;
57 void __iomem *base_regs;
58 void __iomem *data_area;
59};
60
61static int is_xsurf100_network_irq(struct platform_device *pdev)
62{
63 struct xsurf100_ax_plat_data *xs100 = dev_get_platdata(&pdev->dev);
64
65 return (readw(xs100->base_regs + XS100_IRQSTATUS_BASE) & 0xaaaa) != 0;
66}
67
68/* These functions guarantee that the iomem is accessed with 32 bit
69 * cycles only. z_memcpy_fromio / z_memcpy_toio don't
70 */
71static void z_memcpy_fromio32(void *dst, const void __iomem *src, size_t bytes)
72{
73 while (bytes > 32) {
74 asm __volatile__
75 ("movem.l (%0)+,%%d0-%%d7\n"
76 "movem.l %%d0-%%d7,(%1)\n"
77 "adda.l #32,%1" : "=a"(src), "=a"(dst)
78 : "0"(src), "1"(dst) : "d0", "d1", "d2", "d3", "d4",
79 "d5", "d6", "d7", "memory");
80 bytes -= 32;
81 }
82 while (bytes) {
83 *(uint32_t *)dst = z_readl(src);
84 src += 4;
85 dst += 4;
86 bytes -= 4;
87 }
88}
89
90static void z_memcpy_toio32(void __iomem *dst, const void *src, size_t bytes)
91{
92 while (bytes) {
93 z_writel(*(const uint32_t *)src, dst);
94 src += 4;
95 dst += 4;
96 bytes -= 4;
97 }
98}
99
100static void xs100_write(struct net_device *dev, const void *src,
101 unsigned int count)
102{
103 struct ei_device *ei_local = netdev_priv(dev);
104 struct platform_device *pdev = to_platform_device(dev->dev.parent);
105 struct xsurf100_ax_plat_data *xs100 = dev_get_platdata(&pdev->dev);
106
107 /* copy whole blocks */
108 while (count > XS100_8390_DATA_AREA_SIZE) {
109 z_memcpy_toio32(xs100->data_area +
110 XS100_8390_DATA_WRITE32_BASE, src,
111 XS100_8390_DATA_AREA_SIZE);
112 src += XS100_8390_DATA_AREA_SIZE;
113 count -= XS100_8390_DATA_AREA_SIZE;
114 }
115 /* copy whole dwords */
116 z_memcpy_toio32(xs100->data_area + XS100_8390_DATA_WRITE32_BASE,
117 src, count & ~3);
118 src += count & ~3;
119 if (count & 2) {
120 ei_outw(*(uint16_t *)src, ei_local->mem + NE_DATAPORT);
121 src += 2;
122 }
123 if (count & 1)
124 ei_outb(*(uint8_t *)src, ei_local->mem + NE_DATAPORT);
125}
126
127static void xs100_read(struct net_device *dev, void *dst, unsigned int count)
128{
129 struct ei_device *ei_local = netdev_priv(dev);
130 struct platform_device *pdev = to_platform_device(dev->dev.parent);
131 struct xsurf100_ax_plat_data *xs100 = dev_get_platdata(&pdev->dev);
132
133 /* copy whole blocks */
134 while (count > XS100_8390_DATA_AREA_SIZE) {
135 z_memcpy_fromio32(dst, xs100->data_area +
136 XS100_8390_DATA_READ32_BASE,
137 XS100_8390_DATA_AREA_SIZE);
138 dst += XS100_8390_DATA_AREA_SIZE;
139 count -= XS100_8390_DATA_AREA_SIZE;
140 }
141 /* copy whole dwords */
142 z_memcpy_fromio32(dst, xs100->data_area + XS100_8390_DATA_READ32_BASE,
143 count & ~3);
144 dst += count & ~3;
145 if (count & 2) {
146 *(uint16_t *)dst = ei_inw(ei_local->mem + NE_DATAPORT);
147 dst += 2;
148 }
149 if (count & 1)
150 *(uint8_t *)dst = ei_inb(ei_local->mem + NE_DATAPORT);
151}
152
153/* Block input and output, similar to the Crynwr packet driver. If
154 * you are porting to a new ethercard, look at the packet driver
155 * source for hints. The NEx000 doesn't share the on-board packet
156 * memory -- you have to put the packet out through the "remote DMA"
157 * dataport using ei_outb.
158 */
159static void xs100_block_input(struct net_device *dev, int count,
160 struct sk_buff *skb, int ring_offset)
161{
162 struct ei_device *ei_local = netdev_priv(dev);
163 void __iomem *nic_base = ei_local->mem;
164 char *buf = skb->data;
165
166 if (ei_local->dmaing) {
167 netdev_err(dev,
168 "DMAing conflict in %s [DMAstat:%d][irqlock:%d]\n",
169 __func__,
170 ei_local->dmaing, ei_local->irqlock);
171 return;
172 }
173
174 ei_local->dmaing |= 0x01;
175
176 ei_outb(E8390_NODMA + E8390_PAGE0 + E8390_START, nic_base + NE_CMD);
177 ei_outb(count & 0xff, nic_base + EN0_RCNTLO);
178 ei_outb(count >> 8, nic_base + EN0_RCNTHI);
179 ei_outb(ring_offset & 0xff, nic_base + EN0_RSARLO);
180 ei_outb(ring_offset >> 8, nic_base + EN0_RSARHI);
181 ei_outb(E8390_RREAD + E8390_START, nic_base + NE_CMD);
182
183 xs100_read(dev, buf, count);
184
185 ei_local->dmaing &= ~1;
186}
187
188static void xs100_block_output(struct net_device *dev, int count,
189 const unsigned char *buf, const int start_page)
190{
191 struct ei_device *ei_local = netdev_priv(dev);
192 void __iomem *nic_base = ei_local->mem;
193 unsigned long dma_start;
194
195 /* Round the count up for word writes. Do we need to do this?
196 * What effect will an odd byte count have on the 8390? I
197 * should check someday.
198 */
199 if (ei_local->word16 && (count & 0x01))
200 count++;
201
202 /* This *shouldn't* happen. If it does, it's the last thing
203 * you'll see
204 */
205 if (ei_local->dmaing) {
206 netdev_err(dev,
207 "DMAing conflict in %s [DMAstat:%d][irqlock:%d]\n",
208 __func__,
209 ei_local->dmaing, ei_local->irqlock);
210 return;
211 }
212
213 ei_local->dmaing |= 0x01;
214 /* We should already be in page 0, but to be safe... */
215 ei_outb(E8390_PAGE0 + E8390_START + E8390_NODMA, nic_base + NE_CMD);
216
217 ei_outb(ENISR_RDC, nic_base + EN0_ISR);
218
219 /* Now the normal output. */
220 ei_outb(count & 0xff, nic_base + EN0_RCNTLO);
221 ei_outb(count >> 8, nic_base + EN0_RCNTHI);
222 ei_outb(0x00, nic_base + EN0_RSARLO);
223 ei_outb(start_page, nic_base + EN0_RSARHI);
224
225 ei_outb(E8390_RWRITE + E8390_START, nic_base + NE_CMD);
226
227 xs100_write(dev, buf, count);
228
229 dma_start = jiffies;
230
231 while ((ei_inb(nic_base + EN0_ISR) & ENISR_RDC) == 0) {
232 if (jiffies - dma_start > 2 * HZ / 100) { /* 20ms */
233 netdev_warn(dev, "timeout waiting for Tx RDC.\n");
234 ei_local->reset_8390(dev);
235 ax_NS8390_init(dev, 1);
236 break;
237 }
238 }
239
240 ei_outb(ENISR_RDC, nic_base + EN0_ISR); /* Ack intr. */
241 ei_local->dmaing &= ~0x01;
242}
243
244static int xsurf100_probe(struct zorro_dev *zdev,
245 const struct zorro_device_id *ent)
246{
247 struct platform_device *pdev;
248 struct xsurf100_ax_plat_data ax88796_data;
249 struct resource res[2] = {
250 DEFINE_RES_NAMED(IRQ_AMIGA_PORTS, 1, NULL,
251 IORESOURCE_IRQ | IORESOURCE_IRQ_SHAREABLE),
252 DEFINE_RES_MEM(zdev->resource.start + XS100_8390_BASE,
253 4 * 0x20)
254 };
255 int reg;
256 /* This table is referenced in the device structure, so it must
257 * outlive the scope of xsurf100_probe.
258 */
259 static u32 reg_offsets[32];
260 int ret = 0;
261
262 /* X-Surf 100 control and 32 bit ring buffer data access areas.
263 * These resources are not used by the ax88796 driver, so must
264 * be requested here and passed via platform data.
265 */
266
267 if (!request_mem_region(zdev->resource.start, 0x100, zdev->name)) {
268 dev_err(&zdev->dev, "cannot reserve X-Surf 100 control registers\n");
269 return -ENXIO;
270 }
271
272 if (!request_mem_region(zdev->resource.start +
273 XS100_8390_DATA32_BASE,
274 XS100_8390_DATA32_SIZE,
275 "X-Surf 100 32-bit data access")) {
276 dev_err(&zdev->dev, "cannot reserve 32-bit area\n");
277 ret = -ENXIO;
278 goto exit_req;
279 }
280
281 for (reg = 0; reg < 0x20; reg++)
282 reg_offsets[reg] = 4 * reg;
283
284 memset(&ax88796_data, 0, sizeof(ax88796_data));
285 ax88796_data.ax.flags = AXFLG_HAS_EEPROM;
286 ax88796_data.ax.wordlength = 2;
287 ax88796_data.ax.dcr_val = 0x48;
288 ax88796_data.ax.rcr_val = 0x40;
289 ax88796_data.ax.reg_offsets = reg_offsets;
290 ax88796_data.ax.check_irq = is_xsurf100_network_irq;
291 ax88796_data.base_regs = ioremap(zdev->resource.start, 0x100);
292
293 /* error handling for ioremap regs */
294 if (!ax88796_data.base_regs) {
295 dev_err(&zdev->dev, "Cannot ioremap area %pR (registers)\n",
296 &zdev->resource);
297
298 ret = -ENXIO;
299 goto exit_req2;
300 }
301
302 ax88796_data.data_area = ioremap(zdev->resource.start +
303 XS100_8390_DATA32_BASE, XS100_8390_DATA32_SIZE);
304
305 /* error handling for ioremap data */
306 if (!ax88796_data.data_area) {
307 dev_err(&zdev->dev,
308 "Cannot ioremap area %pR offset %x (32-bit access)\n",
309 &zdev->resource, XS100_8390_DATA32_BASE);
310
311 ret = -ENXIO;
312 goto exit_mem;
313 }
314
315 ax88796_data.ax.block_output = xs100_block_output;
316 ax88796_data.ax.block_input = xs100_block_input;
317
318 pdev = platform_device_register_resndata(&zdev->dev, "ax88796",
319 zdev->slotaddr, res, 2,
320 &ax88796_data,
321 sizeof(ax88796_data));
322
323 if (IS_ERR(pdev)) {
324 dev_err(&zdev->dev, "cannot register platform device\n");
325 ret = -ENXIO;
326 goto exit_mem2;
327 }
328
329 zorro_set_drvdata(zdev, pdev);
330
331 if (!ret)
332 return 0;
333
334 exit_mem2:
335 iounmap(ax88796_data.data_area);
336
337 exit_mem:
338 iounmap(ax88796_data.base_regs);
339
340 exit_req2:
341 release_mem_region(zdev->resource.start + XS100_8390_DATA32_BASE,
342 XS100_8390_DATA32_SIZE);
343
344 exit_req:
345 release_mem_region(zdev->resource.start, 0x100);
346
347 return ret;
348}
349
350static void xsurf100_remove(struct zorro_dev *zdev)
351{
352 struct platform_device *pdev = zorro_get_drvdata(zdev);
353 struct xsurf100_ax_plat_data *xs100 = dev_get_platdata(&pdev->dev);
354
355 platform_device_unregister(pdev);
356
357 iounmap(xs100->base_regs);
358 release_mem_region(zdev->resource.start, 0x100);
359 iounmap(xs100->data_area);
360 release_mem_region(zdev->resource.start + XS100_8390_DATA32_BASE,
361 XS100_8390_DATA32_SIZE);
362}
363
364static const struct zorro_device_id xsurf100_zorro_tbl[] = {
365 { ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF100, },
366 { 0 }
367};
368
369MODULE_DEVICE_TABLE(zorro, xsurf100_zorro_tbl);
370
371static struct zorro_driver xsurf100_driver = {
372 .name = "xsurf100",
373 .id_table = xsurf100_zorro_tbl,
374 .probe = xsurf100_probe,
375 .remove = xsurf100_remove,
376};
377
378module_driver(xsurf100_driver, zorro_register_driver, zorro_unregister_driver);
379
380MODULE_DESCRIPTION("X-Surf 100 driver");
381MODULE_AUTHOR("Michael Karcher <kernel@mkarcher.dialup.fu-berlin.de>");
382MODULE_LICENSE("GPL v2");