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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 <linux/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_to_nand(mtd);
29 struct orion_nand_data *board = nand_get_controller_data(nc);
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_to_nand(mtd);
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 nand_chip *nc;
80 struct orion_nand_data *board;
81 struct resource *res;
82 struct clk *clk;
83 void __iomem *io_base;
84 int ret = 0;
85 u32 val = 0;
86
87 nc = devm_kzalloc(&pdev->dev,
88 sizeof(struct nand_chip),
89 GFP_KERNEL);
90 if (!nc)
91 return -ENOMEM;
92 mtd = nand_to_mtd(nc);
93
94 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
95 io_base = devm_ioremap_resource(&pdev->dev, res);
96
97 if (IS_ERR(io_base))
98 return PTR_ERR(io_base);
99
100 if (pdev->dev.of_node) {
101 board = devm_kzalloc(&pdev->dev, sizeof(struct orion_nand_data),
102 GFP_KERNEL);
103 if (!board)
104 return -ENOMEM;
105 if (!of_property_read_u32(pdev->dev.of_node, "cle", &val))
106 board->cle = (u8)val;
107 else
108 board->cle = 0;
109 if (!of_property_read_u32(pdev->dev.of_node, "ale", &val))
110 board->ale = (u8)val;
111 else
112 board->ale = 1;
113 if (!of_property_read_u32(pdev->dev.of_node,
114 "bank-width", &val))
115 board->width = (u8)val * 8;
116 else
117 board->width = 8;
118 if (!of_property_read_u32(pdev->dev.of_node,
119 "chip-delay", &val))
120 board->chip_delay = (u8)val;
121 } else {
122 board = dev_get_platdata(&pdev->dev);
123 }
124
125 mtd->dev.parent = &pdev->dev;
126
127 nand_set_controller_data(nc, board);
128 nand_set_flash_node(nc, pdev->dev.of_node);
129 nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
130 nc->cmd_ctrl = orion_nand_cmd_ctrl;
131 nc->read_buf = orion_nand_read_buf;
132 nc->ecc.mode = NAND_ECC_SOFT;
133 nc->ecc.algo = NAND_ECC_HAMMING;
134
135 if (board->chip_delay)
136 nc->chip_delay = board->chip_delay;
137
138 WARN(board->width > 16,
139 "%d bit bus width out of range",
140 board->width);
141
142 if (board->width == 16)
143 nc->options |= NAND_BUSWIDTH_16;
144
145 if (board->dev_ready)
146 nc->dev_ready = board->dev_ready;
147
148 platform_set_drvdata(pdev, mtd);
149
150
151
152 clk = clk_get(&pdev->dev, NULL);
153 if (!IS_ERR(clk)) {
154 clk_prepare_enable(clk);
155 clk_put(clk);
156 }
157
158 if (nand_scan(mtd, 1)) {
159 ret = -ENXIO;
160 goto no_dev;
161 }
162
163 mtd->name = "orion_nand";
164 ret = mtd_device_register(mtd, board->parts, board->nr_parts);
165 if (ret) {
166 nand_release(mtd);
167 goto no_dev;
168 }
169
170 return 0;
171
172no_dev:
173 if (!IS_ERR(clk)) {
174 clk_disable_unprepare(clk);
175 clk_put(clk);
176 }
177
178 return ret;
179}
180
181static int orion_nand_remove(struct platform_device *pdev)
182{
183 struct mtd_info *mtd = platform_get_drvdata(pdev);
184 struct clk *clk;
185
186 nand_release(mtd);
187
188 clk = clk_get(&pdev->dev, NULL);
189 if (!IS_ERR(clk)) {
190 clk_disable_unprepare(clk);
191 clk_put(clk);
192 }
193
194 return 0;
195}
196
197#ifdef CONFIG_OF
198static const struct of_device_id orion_nand_of_match_table[] = {
199 { .compatible = "marvell,orion-nand", },
200 {},
201};
202MODULE_DEVICE_TABLE(of, orion_nand_of_match_table);
203#endif
204
205static struct platform_driver orion_nand_driver = {
206 .remove = orion_nand_remove,
207 .driver = {
208 .name = "orion_nand",
209 .of_match_table = of_match_ptr(orion_nand_of_match_table),
210 },
211};
212
213module_platform_driver_probe(orion_nand_driver, orion_nand_probe);
214
215MODULE_LICENSE("GPL");
216MODULE_AUTHOR("Tzachi Perelstein");
217MODULE_DESCRIPTION("NAND glue for Orion platforms");
218MODULE_ALIAS("platform:orion_nand");
219
