1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
--- a/drivers/spi/spi-ath79.c
+++ b/drivers/spi/spi-ath79.c
@@ -37,6 +37,11 @@
#define ATH79_SPI_CS_LINE_MAX 2
+enum ath79_spi_state {
+ ATH79_SPI_STATE_WAIT_CMD = 0,
+ ATH79_SPI_STATE_WAIT_READ,
+};
+
struct ath79_spi {
struct spi_bitbang bitbang;
u32 ioc_base;
@@ -44,6 +49,11 @@ struct ath79_spi {
void __iomem *base;
struct clk *clk;
unsigned rrw_delay;
+
+ enum ath79_spi_state state;
+ u32 clk_div;
+ unsigned long read_addr;
+ unsigned long ahb_rate;
};
static inline u32 ath79_spi_rr(struct ath79_spi *sp, unsigned reg)
@@ -108,9 +118,6 @@ static void ath79_spi_enable(struct ath7
/* save CTRL register */
sp->reg_ctrl = ath79_spi_rr(sp, AR71XX_SPI_REG_CTRL);
sp->ioc_base = ath79_spi_rr(sp, AR71XX_SPI_REG_IOC);
-
- /* TODO: setup speed? */
- ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43);
}
static void ath79_spi_disable(struct ath79_spi *sp)
@@ -229,6 +236,110 @@ static u32 ath79_spi_txrx_mode0(struct s
return ath79_spi_rr(sp, AR71XX_SPI_REG_RDS);
}
+static int ath79_spi_do_read_flash_data(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ struct ath79_spi *sp = ath79_spidev_to_sp(spi);
+
+ /* disable GPIO mode */
+ ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
+
+ memcpy_fromio(t->rx_buf, sp->base + sp->read_addr, t->len);
+
+ /* enable GPIO mode */
+ ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);
+
+ /* restore IOC register */
+ ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
+
+ return t->len;
+}
+
+static int ath79_spi_do_read_flash_cmd(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ struct ath79_spi *sp = ath79_spidev_to_sp(spi);
+ int len;
+ const u8 *p;
+
+ sp->read_addr = 0;
+
+ len = t->len - 1;
+ p = t->tx_buf;
+
+ while (len--) {
+ p++;
+ sp->read_addr <<= 8;
+ sp->read_addr |= *p;
+ }
+
+ return t->len;
+}
+
+static bool ath79_spi_is_read_cmd(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ return t->type == SPI_TRANSFER_FLASH_READ_CMD;
+}
+
+static bool ath79_spi_is_data_read(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ return t->type == SPI_TRANSFER_FLASH_READ_DATA;
+}
+
+static int ath79_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
+{
+ struct ath79_spi *sp = ath79_spidev_to_sp(spi);
+ int ret;
+
+ switch (sp->state) {
+ case ATH79_SPI_STATE_WAIT_CMD:
+ if (ath79_spi_is_read_cmd(spi, t)) {
+ ret = ath79_spi_do_read_flash_cmd(spi, t);
+ sp->state = ATH79_SPI_STATE_WAIT_READ;
+ } else {
+ ret = spi_bitbang_bufs(spi, t);
+ }
+ break;
+
+ case ATH79_SPI_STATE_WAIT_READ:
+ if (ath79_spi_is_data_read(spi, t)) {
+ ret = ath79_spi_do_read_flash_data(spi, t);
+ } else {
+ dev_warn(&spi->dev, "flash data read expected\n");
+ ret = -EIO;
+ }
+ sp->state = ATH79_SPI_STATE_WAIT_CMD;
+ break;
+
+ default:
+ BUG();
+ }
+
+ return ret;
+}
+
+static int ath79_spi_setup_transfer(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ struct ath79_spi *sp = ath79_spidev_to_sp(spi);
+ struct ath79_spi_controller_data *cdata;
+ int ret;
+
+ ret = spi_bitbang_setup_transfer(spi, t);
+ if (ret)
+ return ret;
+
+ cdata = spi->controller_data;
+ if (cdata->is_flash)
+ sp->bitbang.txrx_bufs = ath79_spi_txrx_bufs;
+ else
+ sp->bitbang.txrx_bufs = spi_bitbang_bufs;
+
+ return ret;
+}
+
static __devinit int ath79_spi_probe(struct platform_device *pdev)
{
struct spi_master *master;
@@ -251,6 +362,8 @@ static __devinit int ath79_spi_probe(str
sp = spi_master_get_devdata(master);
platform_set_drvdata(pdev, sp);
+ sp->state = ATH79_SPI_STATE_WAIT_CMD;
+
master->setup = ath79_spi_setup;
master->cleanup = ath79_spi_cleanup;
master->bus_num = pdata->bus_num;
@@ -259,7 +372,7 @@ static __devinit int ath79_spi_probe(str
sp->bitbang.master = spi_master_get(master);
sp->bitbang.chipselect = ath79_spi_chipselect;
sp->bitbang.txrx_word[SPI_MODE_0] = ath79_spi_txrx_mode0;
- sp->bitbang.setup_transfer = spi_bitbang_setup_transfer;
+ sp->bitbang.setup_transfer = ath79_spi_setup_transfer;
sp->bitbang.flags = SPI_CS_HIGH;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -284,7 +397,8 @@ static __devinit int ath79_spi_probe(str
if (ret)
goto err_clk_put;
- rate = DIV_ROUND_UP(clk_get_rate(sp->clk), MHZ);
+ sp->ahb_rate = clk_get_rate(sp->clk);
+ rate = DIV_ROUND_UP(sp->ahb_rate, MHZ);
if (!rate) {
ret = -EINVAL;
goto err_clk_disable;
--- a/arch/mips/include/asm/mach-ath79/ath79_spi_platform.h
+++ b/arch/mips/include/asm/mach-ath79/ath79_spi_platform.h
@@ -24,6 +24,7 @@ enum ath79_spi_cs_type {
struct ath79_spi_controller_data {
enum ath79_spi_cs_type cs_type;
unsigned cs_line;
+ bool is_flash;
};
#endif /* _ATH79_SPI_PLATFORM_H */
|
