summaryrefslogtreecommitdiff
path: root/target/linux/ar71xx/patches-3.2/306-spi-rb4xx-3.2-fixes.patch
blob: cd154324d90fd7f7a41abc3471f5ce67b964615a (plain)
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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
--- a/drivers/spi/spi-rb4xx.c
+++ b/drivers/spi/spi-rb4xx.c
@@ -12,7 +12,10 @@
  *
  */
 
+#include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/spinlock.h>
@@ -20,7 +23,8 @@
 #include <linux/platform_device.h>
 #include <linux/spi/spi.h>
 
-#include <asm/mach-ar71xx/ar71xx.h>
+#include <asm/mach-ath79/ar71xx_regs.h>
+#include <asm/mach-ath79/ath79.h>
 
 #define DRV_NAME	"rb4xx-spi"
 #define DRV_DESC	"Mikrotik RB4xx SPI controller driver"
@@ -41,13 +45,16 @@ struct rb4xx_spi {
 	unsigned		spi_ctrl_flash;
 	unsigned		spi_ctrl_fread;
 
+	struct clk		*ahb_clk;
+	unsigned long		ahb_freq;
+
 	spinlock_t		lock;
 	struct list_head	queue;
 	int			busy:1;
 	int			cs_wait;
 };
 
-static unsigned spi_clk_low = SPI_IOC_CS1;
+static unsigned spi_clk_low = AR71XX_SPI_IOC_CS1;
 
 #ifdef RB4XX_SPI_DEBUG
 static inline void do_spi_delay(void)
@@ -60,10 +67,11 @@ static inline void do_spi_delay(void) { 
 
 static inline void do_spi_init(struct spi_device *spi)
 {
-	unsigned cs = SPI_IOC_CS0 | SPI_IOC_CS1;
+	unsigned cs = AR71XX_SPI_IOC_CS0 | AR71XX_SPI_IOC_CS1;
 
 	if (!(spi->mode & SPI_CS_HIGH))
-		cs ^= (spi->chip_select == 2) ? SPI_IOC_CS1 : SPI_IOC_CS0;
+		cs ^= (spi->chip_select == 2) ? AR71XX_SPI_IOC_CS1 :
+						AR71XX_SPI_IOC_CS0;
 
 	spi_clk_low = cs;
 }
@@ -71,17 +79,18 @@ static inline void do_spi_init(struct sp
 static inline void do_spi_finish(void __iomem *base)
 {
 	do_spi_delay();
-	__raw_writel(SPI_IOC_CS0 | SPI_IOC_CS1, base + SPI_REG_IOC);
+	__raw_writel(AR71XX_SPI_IOC_CS0 | AR71XX_SPI_IOC_CS1,
+		     base + AR71XX_SPI_REG_IOC);
 }
 
 static inline void do_spi_clk(void __iomem *base, int bit)
 {
-	unsigned bval = spi_clk_low | ((bit & 1) ? SPI_IOC_DO : 0);
+	unsigned bval = spi_clk_low | ((bit & 1) ? AR71XX_SPI_IOC_DO : 0);
 
 	do_spi_delay();
-	__raw_writel(bval, base + SPI_REG_IOC);
+	__raw_writel(bval, base + AR71XX_SPI_REG_IOC);
 	do_spi_delay();
-	__raw_writel(bval | SPI_IOC_CLK, base + SPI_REG_IOC);
+	__raw_writel(bval | AR71XX_SPI_IOC_CLK, base + AR71XX_SPI_REG_IOC);
 }
 
 static void do_spi_byte(void __iomem *base, unsigned char byte)
@@ -97,19 +106,19 @@ static void do_spi_byte(void __iomem *ba
 
 	pr_debug("spi_byte sent 0x%02x got 0x%02x\n",
 	       (unsigned)byte,
-	       (unsigned char)__raw_readl(base + SPI_REG_RDS));
+	       (unsigned char)__raw_readl(base + AR71XX_SPI_REG_RDS));
 }
 
 static inline void do_spi_clk_fast(void __iomem *base, unsigned bit1,
 				   unsigned bit2)
 {
 	unsigned bval = (spi_clk_low |
-			 ((bit1 & 1) ? SPI_IOC_DO : 0) |
-			 ((bit2 & 1) ? SPI_IOC_CS2 : 0));
+			 ((bit1 & 1) ? AR71XX_SPI_IOC_DO : 0) |
+			 ((bit2 & 1) ? AR71XX_SPI_IOC_CS2 : 0));
 	do_spi_delay();
-	__raw_writel(bval, base + SPI_REG_IOC);
+	__raw_writel(bval, base + AR71XX_SPI_REG_IOC);
 	do_spi_delay();
-	__raw_writel(bval | SPI_IOC_CLK, base + SPI_REG_IOC);
+	__raw_writel(bval | AR71XX_SPI_IOC_CLK, base + AR71XX_SPI_REG_IOC);
 }
 
 static void do_spi_byte_fast(void __iomem *base, unsigned char byte)
@@ -121,7 +130,7 @@ static void do_spi_byte_fast(void __iome
 
 	pr_debug("spi_byte_fast sent 0x%02x got 0x%02x\n",
 	       (unsigned)byte,
-	       (unsigned char) __raw_readl(base + SPI_REG_RDS));
+	       (unsigned char) __raw_readl(base + AR71XX_SPI_REG_RDS));
 }
 
 static int rb4xx_spi_txrx(void __iomem *base, struct spi_transfer *t)
@@ -150,9 +159,9 @@ static int rb4xx_spi_txrx(void __iomem *
 			do_spi_byte(base, sdata);
 
 		if (rx_ptr) {
-			rx_ptr[i] = __raw_readl(base + SPI_REG_RDS) & 0xff;
+			rx_ptr[i] = __raw_readl(base + AR71XX_SPI_REG_RDS) & 0xff;
 		} else if (rxv_ptr) {
-			unsigned char c = __raw_readl(base + SPI_REG_RDS);
+			unsigned char c = __raw_readl(base + AR71XX_SPI_REG_RDS);
 			if (rxv_ptr[i] != c)
 				return i;
 		}
@@ -201,9 +210,9 @@ static int rb4xx_spi_read_fast(struct rb
 	if (t->tx_buf && !t->verify)
 		return -1;
 
-	__raw_writel(SPI_FS_GPIO, base + SPI_REG_FS);
-	__raw_writel(rbspi->spi_ctrl_fread, base + SPI_REG_CTRL);
-	__raw_writel(0, base + SPI_REG_FS);
+	__raw_writel(AR71XX_SPI_FS_GPIO, base + AR71XX_SPI_REG_FS);
+	__raw_writel(rbspi->spi_ctrl_fread, base + AR71XX_SPI_REG_CTRL);
+	__raw_writel(0, base + AR71XX_SPI_REG_FS);
 
 	if (t->rx_buf) {
 		memcpy(t->rx_buf, (const void *)addr, t->len);
@@ -216,9 +225,9 @@ static int rb4xx_spi_read_fast(struct rb
 	m->actual_length += t->len;
 
 	if (rbspi->spi_ctrl_flash != rbspi->spi_ctrl_fread) {
-		__raw_writel(SPI_FS_GPIO, base + SPI_REG_FS);
-		__raw_writel(rbspi->spi_ctrl_flash, base + SPI_REG_CTRL);
-		__raw_writel(0, base + SPI_REG_FS);
+		__raw_writel(AR71XX_SPI_FS_GPIO, base + AR71XX_SPI_REG_FS);
+		__raw_writel(rbspi->spi_ctrl_flash, base + AR71XX_SPI_REG_CTRL);
+		__raw_writel(0, base + AR71XX_SPI_REG_FS);
 	}
 
 	return 0;
@@ -237,8 +246,8 @@ static int rb4xx_spi_msg(struct rb4xx_sp
 		if (rb4xx_spi_read_fast(rbspi, m) == 0)
 			return -1;
 
-	__raw_writel(SPI_FS_GPIO, base + SPI_REG_FS);
-	__raw_writel(SPI_CTRL_FASTEST, base + SPI_REG_CTRL);
+	__raw_writel(AR71XX_SPI_FS_GPIO, base + AR71XX_SPI_REG_FS);
+	__raw_writel(SPI_CTRL_FASTEST, base + AR71XX_SPI_REG_CTRL);
 	do_spi_init(m->spi);
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -262,8 +271,8 @@ static int rb4xx_spi_msg(struct rb4xx_sp
 	}
 
 	do_spi_finish(base);
-	__raw_writel(rbspi->spi_ctrl_flash, base + SPI_REG_CTRL);
-	__raw_writel(0, base + SPI_REG_FS);
+	__raw_writel(rbspi->spi_ctrl_flash, base + AR71XX_SPI_REG_CTRL);
+	__raw_writel(0, base + AR71XX_SPI_REG_FS);
 	return -1;
 }
 
@@ -352,11 +361,12 @@ static int rb4xx_spi_setup(struct spi_de
 	return 0;
 }
 
-static unsigned get_spi_ctrl(unsigned hz_max, const char *name)
+static unsigned get_spi_ctrl(struct rb4xx_spi *rbspi, unsigned hz_max,
+			     const char *name)
 {
 	unsigned div;
 
-	div = (ar71xx_ahb_freq - 1) / (2 * hz_max);
+	div = (rbspi->ahb_freq - 1) / (2 * hz_max);
 
 	/*
 	 * CPU has a bug at (div == 0) - first bit read is random
@@ -365,7 +375,7 @@ static unsigned get_spi_ctrl(unsigned hz
 		++div;
 
 	if (name) {
-		unsigned ahb_khz = (ar71xx_ahb_freq + 500) / 1000;
+		unsigned ahb_khz = (rbspi->ahb_freq + 500) / 1000;
 		unsigned div_real = 2 * (div + 1);
 		pr_debug("rb4xx: %s SPI clock %u kHz (AHB %u kHz / %u)\n",
 		       name,
@@ -396,23 +406,40 @@ static int rb4xx_spi_probe(struct platfo
 	master->transfer = rb4xx_spi_transfer;
 
 	rbspi = spi_master_get_devdata(master);
+
+	rbspi->ahb_clk = clk_get(&pdev->dev, "AHB");
+	if (IS_ERR(rbspi->ahb_clk)) {
+		err = PTR_ERR(rbspi->ahb_clk);
+		goto err_put_master;
+	}
+
+	err = clk_enable(rbspi->ahb_clk);
+	if (err)
+		goto err_clk_put;
+
+	rbspi->ahb_freq = clk_get_rate(rbspi->ahb_clk);
+	if (!rbspi->ahb_freq) {
+		err = -EINVAL;
+		goto err_clk_disable;
+	}
+
 	platform_set_drvdata(pdev, rbspi);
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (r == NULL) {
 		err = -ENOENT;
-		goto err_put_master;
+		goto err_clk_disable;
 	}
 
 	rbspi->base = ioremap(r->start, r->end - r->start + 1);
 	if (!rbspi->base) {
 		err = -ENXIO;
-		goto err_put_master;
+		goto err_clk_disable;
 	}
 
 	rbspi->master = master;
-	rbspi->spi_ctrl_flash = get_spi_ctrl(SPI_FLASH_HZ, "FLASH");
-	rbspi->spi_ctrl_fread = get_spi_ctrl(SPI_CPLD_HZ, "CPLD");
+	rbspi->spi_ctrl_flash = get_spi_ctrl(rbspi, SPI_FLASH_HZ, "FLASH");
+	rbspi->spi_ctrl_fread = get_spi_ctrl(rbspi, SPI_CPLD_HZ, "CPLD");
 	rbspi->cs_wait = -1;
 
 	spin_lock_init(&rbspi->lock);
@@ -428,6 +455,10 @@ static int rb4xx_spi_probe(struct platfo
 
 err_iounmap:
 	iounmap(rbspi->base);
+err_clk_disable:
+	clk_disable(rbspi->ahb_clk);
+err_clk_put:
+	clk_put(rbspi->ahb_clk);
 err_put_master:
 	platform_set_drvdata(pdev, NULL);
 	spi_master_put(master);
@@ -440,6 +471,8 @@ static int rb4xx_spi_remove(struct platf
 	struct rb4xx_spi *rbspi = platform_get_drvdata(pdev);
 
 	iounmap(rbspi->base);
+	clk_disable(rbspi->ahb_clk);
+	clk_put(rbspi->ahb_clk);
 	platform_set_drvdata(pdev, NULL);
 	spi_master_put(rbspi->master);