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13#include <linux/slab.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/of.h>
17#include <linux/mtd/mtd.h>
18#include <linux/mtd/nand.h>
19#include <linux/mtd/partitions.h>
20#include <linux/clk.h>
21#include <linux/err.h>
22#include <asm/io.h>
23#include <asm/sizes.h>
24#include <linux/platform_data/mtd-orion_nand.h>
25
26static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
27{
28 struct nand_chip *nc = mtd->priv;
29 struct orion_nand_data *board = nc->priv;
30 u32 offs;
31
32 if (cmd == NAND_CMD_NONE)
33 return;
34
35 if (ctrl & NAND_CLE)
36 offs = (1 << board->cle);
37 else if (ctrl & NAND_ALE)
38 offs = (1 << board->ale);
39 else
40 return;
41
42 if (nc->options & NAND_BUSWIDTH_16)
43 offs <<= 1;
44
45 writeb(cmd, nc->IO_ADDR_W + offs);
46}
47
48static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
49{
50 struct nand_chip *chip = mtd->priv;
51 void __iomem *io_base = chip->IO_ADDR_R;
52 uint64_t *buf64;
53 int i = 0;
54
55 while (len && (unsigned long)buf & 7) {
56 *buf++ = readb(io_base);
57 len--;
58 }
59 buf64 = (uint64_t *)buf;
60 while (i < len/8) {
61
62
63
64
65
66 register uint64_t x asm ("r2");
67
68 asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base));
69 buf64[i++] = x;
70 }
71 i *= 8;
72 while (i < len)
73 buf[i++] = readb(io_base);
74}
75
76static int __init orion_nand_probe(struct platform_device *pdev)
77{
78 struct mtd_info *mtd;
79 struct mtd_part_parser_data ppdata = {};
80 struct nand_chip *nc;
81 struct orion_nand_data *board;
82 struct resource *res;
83 struct clk *clk;
84 void __iomem *io_base;
85 int ret = 0;
86 u32 val = 0;
87
88 nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
89 if (!nc) {
90 printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
91 ret = -ENOMEM;
92 goto no_res;
93 }
94 mtd = (struct mtd_info *)(nc + 1);
95
96 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
97 if (!res) {
98 ret = -ENODEV;
99 goto no_res;
100 }
101
102 io_base = ioremap(res->start, resource_size(res));
103 if (!io_base) {
104 printk(KERN_ERR "orion_nand: ioremap failed\n");
105 ret = -EIO;
106 goto no_res;
107 }
108
109 if (pdev->dev.of_node) {
110 board = devm_kzalloc(&pdev->dev, sizeof(struct orion_nand_data),
111 GFP_KERNEL);
112 if (!board) {
113 printk(KERN_ERR "orion_nand: failed to allocate board structure.\n");
114 ret = -ENOMEM;
115 goto no_res;
116 }
117 if (!of_property_read_u32(pdev->dev.of_node, "cle", &val))
118 board->cle = (u8)val;
119 else
120 board->cle = 0;
121 if (!of_property_read_u32(pdev->dev.of_node, "ale", &val))
122 board->ale = (u8)val;
123 else
124 board->ale = 1;
125 if (!of_property_read_u32(pdev->dev.of_node,
126 "bank-width", &val))
127 board->width = (u8)val * 8;
128 else
129 board->width = 8;
130 if (!of_property_read_u32(pdev->dev.of_node,
131 "chip-delay", &val))
132 board->chip_delay = (u8)val;
133 } else
134 board = pdev->dev.platform_data;
135
136 mtd->priv = nc;
137 mtd->owner = THIS_MODULE;
138
139 nc->priv = board;
140 nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
141 nc->cmd_ctrl = orion_nand_cmd_ctrl;
142 nc->read_buf = orion_nand_read_buf;
143 nc->ecc.mode = NAND_ECC_SOFT;
144
145 if (board->chip_delay)
146 nc->chip_delay = board->chip_delay;
147
148 WARN(board->width > 16,
149 "%d bit bus width out of range",
150 board->width);
151
152 if (board->width == 16)
153 nc->options |= NAND_BUSWIDTH_16;
154
155 if (board->dev_ready)
156 nc->dev_ready = board->dev_ready;
157
158 platform_set_drvdata(pdev, mtd);
159
160
161
162 clk = clk_get(&pdev->dev, NULL);
163 if (!IS_ERR(clk)) {
164 clk_prepare_enable(clk);
165 clk_put(clk);
166 }
167
168 if (nand_scan(mtd, 1)) {
169 ret = -ENXIO;
170 goto no_dev;
171 }
172
173 mtd->name = "orion_nand";
174 ppdata.of_node = pdev->dev.of_node;
175 ret = mtd_device_parse_register(mtd, NULL, &ppdata,
176 board->parts, board->nr_parts);
177 if (ret) {
178 nand_release(mtd);
179 goto no_dev;
180 }
181
182 return 0;
183
184no_dev:
185 if (!IS_ERR(clk)) {
186 clk_disable_unprepare(clk);
187 clk_put(clk);
188 }
189 platform_set_drvdata(pdev, NULL);
190 iounmap(io_base);
191no_res:
192 kfree(nc);
193
194 return ret;
195}
196
197static int orion_nand_remove(struct platform_device *pdev)
198{
199 struct mtd_info *mtd = platform_get_drvdata(pdev);
200 struct nand_chip *nc = mtd->priv;
201 struct clk *clk;
202
203 nand_release(mtd);
204
205 iounmap(nc->IO_ADDR_W);
206
207 kfree(nc);
208
209 clk = clk_get(&pdev->dev, NULL);
210 if (!IS_ERR(clk)) {
211 clk_disable_unprepare(clk);
212 clk_put(clk);
213 }
214
215 return 0;
216}
217
218#ifdef CONFIG_OF
219static struct of_device_id orion_nand_of_match_table[] = {
220 { .compatible = "marvell,orion-nand", },
221 {},
222};
223#endif
224
225static struct platform_driver orion_nand_driver = {
226 .remove = orion_nand_remove,
227 .driver = {
228 .name = "orion_nand",
229 .owner = THIS_MODULE,
230 .of_match_table = of_match_ptr(orion_nand_of_match_table),
231 },
232};
233
234module_platform_driver_probe(orion_nand_driver, orion_nand_probe);
235
236MODULE_LICENSE("GPL");
237MODULE_AUTHOR("Tzachi Perelstein");
238MODULE_DESCRIPTION("NAND glue for Orion platforms");
239MODULE_ALIAS("platform:orion_nand");
240
