1 /*
2 * Copyright (C) 2009 by Sascha Hauer, Pengutronix
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
16 * MA 02110-1301, USA.
17 */
18
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/list.h>
22 #include <linux/clk.h>
23 #include <linux/io.h>
24 #include <linux/clkdev.h>
25
26 #include <mach/clock.h>
27 #include <mach/hardware.h>
28 #include <mach/common.h>
29 #include <mach/mx25.h>
30
31 #define CRM_BASE MX25_IO_ADDRESS(MX25_CRM_BASE_ADDR)
32
33 #define CCM_MPCTL 0x00
34 #define CCM_UPCTL 0x04
35 #define CCM_CCTL 0x08
36 #define CCM_CGCR0 0x0C
37 #define CCM_CGCR1 0x10
38 #define CCM_CGCR2 0x14
39 #define CCM_PCDR0 0x18
40 #define CCM_PCDR1 0x1C
41 #define CCM_PCDR2 0x20
42 #define CCM_PCDR3 0x24
43 #define CCM_RCSR 0x28
44 #define CCM_CRDR 0x2C
45 #define CCM_DCVR0 0x30
46 #define CCM_DCVR1 0x34
47 #define CCM_DCVR2 0x38
48 #define CCM_DCVR3 0x3c
49 #define CCM_LTR0 0x40
50 #define CCM_LTR1 0x44
51 #define CCM_LTR2 0x48
52 #define CCM_LTR3 0x4c
53
get_rate_mpll(void)54 static unsigned long get_rate_mpll(void)
55 {
56 ulong mpctl = __raw_readl(CRM_BASE + CCM_MPCTL);
57
58 return mxc_decode_pll(mpctl, 24000000);
59 }
60
get_rate_upll(void)61 static unsigned long get_rate_upll(void)
62 {
63 ulong mpctl = __raw_readl(CRM_BASE + CCM_UPCTL);
64
65 return mxc_decode_pll(mpctl, 24000000);
66 }
67
get_rate_arm(struct clk * clk)68 unsigned long get_rate_arm(struct clk *clk)
69 {
70 unsigned long cctl = readl(CRM_BASE + CCM_CCTL);
71 unsigned long rate = get_rate_mpll();
72
73 if (cctl & (1 << 14))
74 rate = (rate * 3) >> 2;
75
76 return rate / ((cctl >> 30) + 1);
77 }
78
get_rate_ahb(struct clk * clk)79 static unsigned long get_rate_ahb(struct clk *clk)
80 {
81 unsigned long cctl = readl(CRM_BASE + CCM_CCTL);
82
83 return get_rate_arm(NULL) / (((cctl >> 28) & 0x3) + 1);
84 }
85
get_rate_ipg(struct clk * clk)86 static unsigned long get_rate_ipg(struct clk *clk)
87 {
88 return get_rate_ahb(NULL) >> 1;
89 }
90
get_rate_per(int per)91 static unsigned long get_rate_per(int per)
92 {
93 unsigned long ofs = (per & 0x3) * 8;
94 unsigned long reg = per & ~0x3;
95 unsigned long val = (readl(CRM_BASE + CCM_PCDR0 + reg) >> ofs) & 0x3f;
96 unsigned long fref;
97
98 if (readl(CRM_BASE + 0x64) & (1 << per))
99 fref = get_rate_upll();
100 else
101 fref = get_rate_ahb(NULL);
102
103 return fref / (val + 1);
104 }
105
get_rate_uart(struct clk * clk)106 static unsigned long get_rate_uart(struct clk *clk)
107 {
108 return get_rate_per(15);
109 }
110
get_rate_ssi2(struct clk * clk)111 static unsigned long get_rate_ssi2(struct clk *clk)
112 {
113 return get_rate_per(14);
114 }
115
get_rate_ssi1(struct clk * clk)116 static unsigned long get_rate_ssi1(struct clk *clk)
117 {
118 return get_rate_per(13);
119 }
120
get_rate_i2c(struct clk * clk)121 static unsigned long get_rate_i2c(struct clk *clk)
122 {
123 return get_rate_per(6);
124 }
125
get_rate_nfc(struct clk * clk)126 static unsigned long get_rate_nfc(struct clk *clk)
127 {
128 return get_rate_per(8);
129 }
130
get_rate_gpt(struct clk * clk)131 static unsigned long get_rate_gpt(struct clk *clk)
132 {
133 return get_rate_per(5);
134 }
135
get_rate_lcdc(struct clk * clk)136 static unsigned long get_rate_lcdc(struct clk *clk)
137 {
138 return get_rate_per(7);
139 }
140
get_rate_esdhc1(struct clk * clk)141 static unsigned long get_rate_esdhc1(struct clk *clk)
142 {
143 return get_rate_per(3);
144 }
145
get_rate_esdhc2(struct clk * clk)146 static unsigned long get_rate_esdhc2(struct clk *clk)
147 {
148 return get_rate_per(4);
149 }
150
get_rate_csi(struct clk * clk)151 static unsigned long get_rate_csi(struct clk *clk)
152 {
153 return get_rate_per(0);
154 }
155
get_rate_otg(struct clk * clk)156 static unsigned long get_rate_otg(struct clk *clk)
157 {
158 unsigned long cctl = readl(CRM_BASE + CCM_CCTL);
159 unsigned long rate = get_rate_upll();
160
161 return (cctl & (1 << 23)) ? 0 : rate / ((0x3F & (cctl >> 16)) + 1);
162 }
163
clk_cgcr_enable(struct clk * clk)164 static int clk_cgcr_enable(struct clk *clk)
165 {
166 u32 reg;
167
168 reg = __raw_readl(clk->enable_reg);
169 reg |= 1 << clk->enable_shift;
170 __raw_writel(reg, clk->enable_reg);
171
172 return 0;
173 }
174
clk_cgcr_disable(struct clk * clk)175 static void clk_cgcr_disable(struct clk *clk)
176 {
177 u32 reg;
178
179 reg = __raw_readl(clk->enable_reg);
180 reg &= ~(1 << clk->enable_shift);
181 __raw_writel(reg, clk->enable_reg);
182 }
183
184 #define DEFINE_CLOCK(name, i, er, es, gr, sr, s) \
185 static struct clk name = { \
186 .id = i, \
187 .enable_reg = CRM_BASE + er, \
188 .enable_shift = es, \
189 .get_rate = gr, \
190 .set_rate = sr, \
191 .enable = clk_cgcr_enable, \
192 .disable = clk_cgcr_disable, \
193 .secondary = s, \
194 }
195
196 /*
197 * Note: the following IPG clock gating bits are wrongly marked "Reserved" in
198 * the i.MX25 Reference Manual Rev 1, table 15-13. The information below is
199 * taken from the Freescale released BSP.
200 *
201 * bit reg offset clock
202 *
203 * 0 CGCR1 0 AUDMUX
204 * 12 CGCR1 12 ESAI
205 * 16 CGCR1 16 GPIO1
206 * 17 CGCR1 17 GPIO2
207 * 18 CGCR1 18 GPIO3
208 * 23 CGCR1 23 I2C1
209 * 24 CGCR1 24 I2C2
210 * 25 CGCR1 25 I2C3
211 * 27 CGCR1 27 IOMUXC
212 * 28 CGCR1 28 KPP
213 * 30 CGCR1 30 OWIRE
214 * 36 CGCR2 4 RTIC
215 * 51 CGCR2 19 WDOG
216 */
217
218 DEFINE_CLOCK(gpt_clk, 0, CCM_CGCR0, 5, get_rate_gpt, NULL, NULL);
219 DEFINE_CLOCK(uart_per_clk, 0, CCM_CGCR0, 15, get_rate_uart, NULL, NULL);
220 DEFINE_CLOCK(ssi1_per_clk, 0, CCM_CGCR0, 13, get_rate_ipg, NULL, NULL);
221 DEFINE_CLOCK(ssi2_per_clk, 0, CCM_CGCR0, 14, get_rate_ipg, NULL, NULL);
222 DEFINE_CLOCK(cspi1_clk, 0, CCM_CGCR1, 5, get_rate_ipg, NULL, NULL);
223 DEFINE_CLOCK(cspi2_clk, 0, CCM_CGCR1, 6, get_rate_ipg, NULL, NULL);
224 DEFINE_CLOCK(cspi3_clk, 0, CCM_CGCR1, 7, get_rate_ipg, NULL, NULL);
225 DEFINE_CLOCK(esdhc1_ahb_clk, 0, CCM_CGCR0, 21, get_rate_esdhc1, NULL, NULL);
226 DEFINE_CLOCK(esdhc1_per_clk, 0, CCM_CGCR0, 3, get_rate_esdhc1, NULL,
227 &esdhc1_ahb_clk);
228 DEFINE_CLOCK(esdhc2_ahb_clk, 0, CCM_CGCR0, 22, get_rate_esdhc2, NULL, NULL);
229 DEFINE_CLOCK(esdhc2_per_clk, 0, CCM_CGCR0, 4, get_rate_esdhc2, NULL,
230 &esdhc2_ahb_clk);
231 DEFINE_CLOCK(sdma_ahb_clk, 0, CCM_CGCR0, 26, NULL, NULL, NULL);
232 DEFINE_CLOCK(fec_ahb_clk, 0, CCM_CGCR0, 23, NULL, NULL, NULL);
233 DEFINE_CLOCK(lcdc_ahb_clk, 0, CCM_CGCR0, 24, NULL, NULL, NULL);
234 DEFINE_CLOCK(lcdc_per_clk, 0, CCM_CGCR0, 7, NULL, NULL, &lcdc_ahb_clk);
235 DEFINE_CLOCK(csi_ahb_clk, 0, CCM_CGCR0, 18, get_rate_csi, NULL, NULL);
236 DEFINE_CLOCK(csi_per_clk, 0, CCM_CGCR0, 0, get_rate_csi, NULL, &csi_ahb_clk);
237 DEFINE_CLOCK(uart1_clk, 0, CCM_CGCR2, 14, get_rate_uart, NULL, &uart_per_clk);
238 DEFINE_CLOCK(uart2_clk, 0, CCM_CGCR2, 15, get_rate_uart, NULL, &uart_per_clk);
239 DEFINE_CLOCK(uart3_clk, 0, CCM_CGCR2, 16, get_rate_uart, NULL, &uart_per_clk);
240 DEFINE_CLOCK(uart4_clk, 0, CCM_CGCR2, 17, get_rate_uart, NULL, &uart_per_clk);
241 DEFINE_CLOCK(uart5_clk, 0, CCM_CGCR2, 18, get_rate_uart, NULL, &uart_per_clk);
242 DEFINE_CLOCK(nfc_clk, 0, CCM_CGCR0, 8, get_rate_nfc, NULL, NULL);
243 DEFINE_CLOCK(usbotg_clk, 0, CCM_CGCR0, 28, get_rate_otg, NULL, NULL);
244 DEFINE_CLOCK(pwm1_clk, 0, CCM_CGCR1, 31, get_rate_ipg, NULL, NULL);
245 DEFINE_CLOCK(pwm2_clk, 0, CCM_CGCR2, 0, get_rate_ipg, NULL, NULL);
246 DEFINE_CLOCK(pwm3_clk, 0, CCM_CGCR2, 1, get_rate_ipg, NULL, NULL);
247 DEFINE_CLOCK(pwm4_clk, 0, CCM_CGCR2, 2, get_rate_ipg, NULL, NULL);
248 DEFINE_CLOCK(kpp_clk, 0, CCM_CGCR1, 28, get_rate_ipg, NULL, NULL);
249 DEFINE_CLOCK(tsc_clk, 0, CCM_CGCR2, 13, get_rate_ipg, NULL, NULL);
250 DEFINE_CLOCK(i2c_clk, 0, CCM_CGCR0, 6, get_rate_i2c, NULL, NULL);
251 DEFINE_CLOCK(fec_clk, 0, CCM_CGCR1, 15, get_rate_ipg, NULL, &fec_ahb_clk);
252 DEFINE_CLOCK(dryice_clk, 0, CCM_CGCR1, 8, get_rate_ipg, NULL, NULL);
253 DEFINE_CLOCK(lcdc_clk, 0, CCM_CGCR1, 29, get_rate_lcdc, NULL, &lcdc_per_clk);
254 DEFINE_CLOCK(wdt_clk, 0, CCM_CGCR2, 19, get_rate_ipg, NULL, NULL);
255 DEFINE_CLOCK(ssi1_clk, 0, CCM_CGCR2, 11, get_rate_ssi1, NULL, &ssi1_per_clk);
256 DEFINE_CLOCK(ssi2_clk, 1, CCM_CGCR2, 12, get_rate_ssi2, NULL, &ssi2_per_clk);
257 DEFINE_CLOCK(sdma_clk, 0, CCM_CGCR2, 6, get_rate_ipg, NULL, &sdma_ahb_clk);
258 DEFINE_CLOCK(esdhc1_clk, 0, CCM_CGCR1, 13, get_rate_esdhc1, NULL,
259 &esdhc1_per_clk);
260 DEFINE_CLOCK(esdhc2_clk, 1, CCM_CGCR1, 14, get_rate_esdhc2, NULL,
261 &esdhc2_per_clk);
262 DEFINE_CLOCK(audmux_clk, 0, CCM_CGCR1, 0, NULL, NULL, NULL);
263 DEFINE_CLOCK(csi_clk, 0, CCM_CGCR1, 4, get_rate_csi, NULL, &csi_per_clk);
264 DEFINE_CLOCK(can1_clk, 0, CCM_CGCR1, 2, get_rate_ipg, NULL, NULL);
265 DEFINE_CLOCK(can2_clk, 1, CCM_CGCR1, 3, get_rate_ipg, NULL, NULL);
266 DEFINE_CLOCK(iim_clk, 0, CCM_CGCR1, 26, NULL, NULL, NULL);
267
268 #define _REGISTER_CLOCK(d, n, c) \
269 { \
270 .dev_id = d, \
271 .con_id = n, \
272 .clk = &c, \
273 },
274
275 static struct clk_lookup lookups[] = {
276 /* i.mx25 has the i.mx21 type uart */
277 _REGISTER_CLOCK("imx21-uart.0", NULL, uart1_clk)
278 _REGISTER_CLOCK("imx21-uart.1", NULL, uart2_clk)
279 _REGISTER_CLOCK("imx21-uart.2", NULL, uart3_clk)
280 _REGISTER_CLOCK("imx21-uart.3", NULL, uart4_clk)
281 _REGISTER_CLOCK("imx21-uart.4", NULL, uart5_clk)
282 _REGISTER_CLOCK("mxc-ehci.0", "usb", usbotg_clk)
283 _REGISTER_CLOCK("mxc-ehci.1", "usb", usbotg_clk)
284 _REGISTER_CLOCK("mxc-ehci.2", "usb", usbotg_clk)
285 _REGISTER_CLOCK("fsl-usb2-udc", "usb", usbotg_clk)
286 _REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk)
287 /* i.mx25 has the i.mx35 type cspi */
288 _REGISTER_CLOCK("imx35-cspi.0", NULL, cspi1_clk)
289 _REGISTER_CLOCK("imx35-cspi.1", NULL, cspi2_clk)
290 _REGISTER_CLOCK("imx35-cspi.2", NULL, cspi3_clk)
291 _REGISTER_CLOCK("mxc_pwm.0", NULL, pwm1_clk)
292 _REGISTER_CLOCK("mxc_pwm.1", NULL, pwm2_clk)
293 _REGISTER_CLOCK("mxc_pwm.2", NULL, pwm3_clk)
294 _REGISTER_CLOCK("mxc_pwm.3", NULL, pwm4_clk)
295 _REGISTER_CLOCK("imx-keypad", NULL, kpp_clk)
296 _REGISTER_CLOCK("mx25-adc", NULL, tsc_clk)
297 _REGISTER_CLOCK("imx-i2c.0", NULL, i2c_clk)
298 _REGISTER_CLOCK("imx-i2c.1", NULL, i2c_clk)
299 _REGISTER_CLOCK("imx-i2c.2", NULL, i2c_clk)
300 _REGISTER_CLOCK("imx25-fec.0", NULL, fec_clk)
301 _REGISTER_CLOCK("imxdi_rtc.0", NULL, dryice_clk)
302 _REGISTER_CLOCK("imx-fb.0", NULL, lcdc_clk)
303 _REGISTER_CLOCK("imx2-wdt.0", NULL, wdt_clk)
304 _REGISTER_CLOCK("imx-ssi.0", NULL, ssi1_clk)
305 _REGISTER_CLOCK("imx-ssi.1", NULL, ssi2_clk)
306 _REGISTER_CLOCK("sdhci-esdhc-imx25.0", NULL, esdhc1_clk)
307 _REGISTER_CLOCK("sdhci-esdhc-imx25.1", NULL, esdhc2_clk)
308 _REGISTER_CLOCK("mx2-camera.0", NULL, csi_clk)
309 _REGISTER_CLOCK(NULL, "audmux", audmux_clk)
310 _REGISTER_CLOCK("flexcan.0", NULL, can1_clk)
311 _REGISTER_CLOCK("flexcan.1", NULL, can2_clk)
312 /* i.mx25 has the i.mx35 type sdma */
313 _REGISTER_CLOCK("imx35-sdma", NULL, sdma_clk)
314 _REGISTER_CLOCK(NULL, "iim", iim_clk)
315 };
316
mx25_clocks_init(void)317 int __init mx25_clocks_init(void)
318 {
319 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
320
321 /* Turn off all clocks except the ones we need to survive, namely:
322 * EMI, GPIO1-3 (CCM_CGCR1[18:16]), GPT1, IOMUXC (CCM_CGCR1[27]), IIM,
323 * SCC
324 */
325 __raw_writel((1 << 19), CRM_BASE + CCM_CGCR0);
326 __raw_writel((0xf << 16) | (3 << 26), CRM_BASE + CCM_CGCR1);
327 __raw_writel((1 << 5), CRM_BASE + CCM_CGCR2);
328 #if defined(CONFIG_DEBUG_LL) && !defined(CONFIG_DEBUG_ICEDCC)
329 clk_enable(&uart1_clk);
330 #endif
331
332 /* Clock source for lcdc and csi is upll */
333 __raw_writel(__raw_readl(CRM_BASE+0x64) | (1 << 7) | (1 << 0),
334 CRM_BASE + 0x64);
335
336 /* Clock source for gpt is ahb_div */
337 __raw_writel(__raw_readl(CRM_BASE+0x64) & ~(1 << 5), CRM_BASE + 0x64);
338
339 clk_enable(&iim_clk);
340 imx_print_silicon_rev("i.MX25", mx25_revision());
341 clk_disable(&iim_clk);
342
343 mxc_timer_init(&gpt_clk, MX25_IO_ADDRESS(MX25_GPT1_BASE_ADDR), 54);
344
345 return 0;
346 }
347