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ts72xx.c
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1 /*
2  * arch/arm/mach-ep93xx/ts72xx.c
3  * Technologic Systems TS72xx SBC support.
4  *
5  * Copyright (C) 2006 Lennert Buytenhek <[email protected]>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or (at
10  * your option) any later version.
11  */
12 
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/platform_device.h>
18 #include <linux/io.h>
19 #include <linux/m48t86.h>
20 #include <linux/mtd/nand.h>
21 #include <linux/mtd/partitions.h>
22 
23 #include <mach/hardware.h>
24 
25 #include <asm/hardware/vic.h>
26 #include <asm/mach-types.h>
27 #include <asm/mach/map.h>
28 #include <asm/mach/arch.h>
29 
30 #include "soc.h"
31 #include "ts72xx.h"
32 
33 static struct map_desc ts72xx_io_desc[] __initdata = {
34  {
35  .virtual = (unsigned long)TS72XX_MODEL_VIRT_BASE,
36  .pfn = __phys_to_pfn(TS72XX_MODEL_PHYS_BASE),
37  .length = TS72XX_MODEL_SIZE,
38  .type = MT_DEVICE,
39  }, {
40  .virtual = (unsigned long)TS72XX_OPTIONS_VIRT_BASE,
41  .pfn = __phys_to_pfn(TS72XX_OPTIONS_PHYS_BASE),
42  .length = TS72XX_OPTIONS_SIZE,
43  .type = MT_DEVICE,
44  }, {
45  .virtual = (unsigned long)TS72XX_OPTIONS2_VIRT_BASE,
46  .pfn = __phys_to_pfn(TS72XX_OPTIONS2_PHYS_BASE),
47  .length = TS72XX_OPTIONS2_SIZE,
48  .type = MT_DEVICE,
49  }, {
50  .virtual = (unsigned long)TS72XX_RTC_INDEX_VIRT_BASE,
51  .pfn = __phys_to_pfn(TS72XX_RTC_INDEX_PHYS_BASE),
52  .length = TS72XX_RTC_INDEX_SIZE,
53  .type = MT_DEVICE,
54  }, {
55  .virtual = (unsigned long)TS72XX_RTC_DATA_VIRT_BASE,
56  .pfn = __phys_to_pfn(TS72XX_RTC_DATA_PHYS_BASE),
57  .length = TS72XX_RTC_DATA_SIZE,
58  .type = MT_DEVICE,
59  }
60 };
61 
62 static void __init ts72xx_map_io(void)
63 {
64  ep93xx_map_io();
65  iotable_init(ts72xx_io_desc, ARRAY_SIZE(ts72xx_io_desc));
66 }
67 
68 
69 /*************************************************************************
70  * NAND flash
71  *************************************************************************/
72 #define TS72XX_NAND_CONTROL_ADDR_LINE 22 /* 0xN0400000 */
73 #define TS72XX_NAND_BUSY_ADDR_LINE 23 /* 0xN0800000 */
74 
75 static void ts72xx_nand_hwcontrol(struct mtd_info *mtd,
76  int cmd, unsigned int ctrl)
77 {
78  struct nand_chip *chip = mtd->priv;
79 
80  if (ctrl & NAND_CTRL_CHANGE) {
81  void __iomem *addr = chip->IO_ADDR_R;
82  unsigned char bits;
83 
84  addr += (1 << TS72XX_NAND_CONTROL_ADDR_LINE);
85 
86  bits = __raw_readb(addr) & ~0x07;
87  bits |= (ctrl & NAND_NCE) << 2; /* bit 0 -> bit 2 */
88  bits |= (ctrl & NAND_CLE); /* bit 1 -> bit 1 */
89  bits |= (ctrl & NAND_ALE) >> 2; /* bit 2 -> bit 0 */
90 
91  __raw_writeb(bits, addr);
92  }
93 
94  if (cmd != NAND_CMD_NONE)
95  __raw_writeb(cmd, chip->IO_ADDR_W);
96 }
97 
98 static int ts72xx_nand_device_ready(struct mtd_info *mtd)
99 {
100  struct nand_chip *chip = mtd->priv;
101  void __iomem *addr = chip->IO_ADDR_R;
102 
103  addr += (1 << TS72XX_NAND_BUSY_ADDR_LINE);
104 
105  return !!(__raw_readb(addr) & 0x20);
106 }
107 
108 #define TS72XX_BOOTROM_PART_SIZE (SZ_16K)
109 #define TS72XX_REDBOOT_PART_SIZE (SZ_2M + SZ_1M)
110 
111 static struct mtd_partition ts72xx_nand_parts[] = {
112  {
113  .name = "TS-BOOTROM",
114  .offset = 0,
115  .size = TS72XX_BOOTROM_PART_SIZE,
116  .mask_flags = MTD_WRITEABLE, /* force read-only */
117  }, {
118  .name = "Linux",
119  .offset = MTDPART_OFS_RETAIN,
120  .size = TS72XX_REDBOOT_PART_SIZE,
121  /* leave so much for last partition */
122  }, {
123  .name = "RedBoot",
124  .offset = MTDPART_OFS_APPEND,
125  .size = MTDPART_SIZ_FULL,
126  .mask_flags = MTD_WRITEABLE, /* force read-only */
127  },
128 };
129 
130 static struct platform_nand_data ts72xx_nand_data = {
131  .chip = {
132  .nr_chips = 1,
133  .chip_offset = 0,
134  .chip_delay = 15,
135  .partitions = ts72xx_nand_parts,
136  .nr_partitions = ARRAY_SIZE(ts72xx_nand_parts),
137  },
138  .ctrl = {
139  .cmd_ctrl = ts72xx_nand_hwcontrol,
140  .dev_ready = ts72xx_nand_device_ready,
141  },
142 };
143 
144 static struct resource ts72xx_nand_resource[] = {
145  {
146  .start = 0, /* filled in later */
147  .end = 0, /* filled in later */
148  .flags = IORESOURCE_MEM,
149  },
150 };
151 
152 static struct platform_device ts72xx_nand_flash = {
153  .name = "gen_nand",
154  .id = -1,
155  .dev.platform_data = &ts72xx_nand_data,
156  .resource = ts72xx_nand_resource,
157  .num_resources = ARRAY_SIZE(ts72xx_nand_resource),
158 };
159 
160 
161 static void __init ts72xx_register_flash(void)
162 {
163  /*
164  * TS7200 has NOR flash all other TS72xx board have NAND flash.
165  */
166  if (board_is_ts7200()) {
167  ep93xx_register_flash(2, EP93XX_CS6_PHYS_BASE, SZ_16M);
168  } else {
169  resource_size_t start;
170 
171  if (is_ts9420_installed())
172  start = EP93XX_CS7_PHYS_BASE;
173  else
174  start = EP93XX_CS6_PHYS_BASE;
175 
176  ts72xx_nand_resource[0].start = start;
177  ts72xx_nand_resource[0].end = start + SZ_16M - 1;
178 
179  platform_device_register(&ts72xx_nand_flash);
180  }
181 }
182 
183 
184 static unsigned char ts72xx_rtc_readbyte(unsigned long addr)
185 {
186  __raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);
187  return __raw_readb(TS72XX_RTC_DATA_VIRT_BASE);
188 }
189 
190 static void ts72xx_rtc_writebyte(unsigned char value, unsigned long addr)
191 {
192  __raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);
193  __raw_writeb(value, TS72XX_RTC_DATA_VIRT_BASE);
194 }
195 
196 static struct m48t86_ops ts72xx_rtc_ops = {
197  .readbyte = ts72xx_rtc_readbyte,
198  .writebyte = ts72xx_rtc_writebyte,
199 };
200 
201 static struct platform_device ts72xx_rtc_device = {
202  .name = "rtc-m48t86",
203  .id = -1,
204  .dev = {
205  .platform_data = &ts72xx_rtc_ops,
206  },
207  .num_resources = 0,
208 };
209 
210 static struct resource ts72xx_wdt_resources[] = {
211  {
212  .start = TS72XX_WDT_CONTROL_PHYS_BASE,
213  .end = TS72XX_WDT_CONTROL_PHYS_BASE + SZ_4K - 1,
214  .flags = IORESOURCE_MEM,
215  },
216  {
217  .start = TS72XX_WDT_FEED_PHYS_BASE,
218  .end = TS72XX_WDT_FEED_PHYS_BASE + SZ_4K - 1,
219  .flags = IORESOURCE_MEM,
220  },
221 };
222 
223 static struct platform_device ts72xx_wdt_device = {
224  .name = "ts72xx-wdt",
225  .id = -1,
226  .num_resources = ARRAY_SIZE(ts72xx_wdt_resources),
227  .resource = ts72xx_wdt_resources,
228 };
229 
230 static struct ep93xx_eth_data __initdata ts72xx_eth_data = {
231  .phy_id = 1,
232 };
233 
234 static void __init ts72xx_init_machine(void)
235 {
236  ep93xx_init_devices();
237  ts72xx_register_flash();
238  platform_device_register(&ts72xx_rtc_device);
239  platform_device_register(&ts72xx_wdt_device);
240 
241  ep93xx_register_eth(&ts72xx_eth_data, 1);
242 }
243 
244 MACHINE_START(TS72XX, "Technologic Systems TS-72xx SBC")
245  /* Maintainer: Lennert Buytenhek <[email protected]> */
246  .atag_offset = 0x100,
247  .map_io = ts72xx_map_io,
248  .init_irq = ep93xx_init_irq,
249  .handle_irq = vic_handle_irq,
250  .timer = &ep93xx_timer,
251  .init_machine = ts72xx_init_machine,
252  .init_late = ep93xx_init_late,
253  .restart = ep93xx_restart,
254 MACHINE_END
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