2 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 /* Simple clock driver for Allwinner A10 */
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
37 #include <sys/malloc.h>
39 #include <machine/bus.h>
41 #include <dev/ofw/openfirm.h>
42 #include <dev/ofw/ofw_bus_subr.h>
46 struct a10_ccm_softc {
49 bus_space_handle_t bsh;
53 static struct a10_ccm_softc *a10_ccm_sc = NULL;
55 #define ccm_read_4(sc, reg) \
56 bus_space_read_4((sc)->bst, (sc)->bsh, (reg))
57 #define ccm_write_4(sc, reg, val) \
58 bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val))
61 a10_ccm_probe(device_t dev)
64 if (!ofw_bus_status_okay(dev))
67 if (ofw_bus_is_compatible(dev, "allwinner,sun4i-ccm")) {
68 device_set_desc(dev, "Allwinner Clock Control Module");
69 return(BUS_PROBE_DEFAULT);
76 a10_ccm_attach(device_t dev)
78 struct a10_ccm_softc *sc = device_get_softc(dev);
84 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
86 device_printf(dev, "could not allocate resource\n");
90 sc->bst = rman_get_bustag(sc->res);
91 sc->bsh = rman_get_bushandle(sc->res);
98 static device_method_t a10_ccm_methods[] = {
99 DEVMETHOD(device_probe, a10_ccm_probe),
100 DEVMETHOD(device_attach, a10_ccm_attach),
104 static driver_t a10_ccm_driver = {
107 sizeof(struct a10_ccm_softc),
110 static devclass_t a10_ccm_devclass;
112 EARLY_DRIVER_MODULE(a10_ccm, simplebus, a10_ccm_driver, a10_ccm_devclass, 0, 0,
113 BUS_PASS_TIMER + BUS_PASS_ORDER_MIDDLE);
116 a10_clk_usb_activate(void)
118 struct a10_ccm_softc *sc = a10_ccm_sc;
124 /* Gating AHB clock for USB */
125 reg_value = ccm_read_4(sc, CCM_AHB_GATING0);
126 reg_value |= CCM_AHB_GATING_USB0; /* AHB clock gate usb0 */
127 reg_value |= CCM_AHB_GATING_EHCI0; /* AHB clock gate ehci0 */
128 reg_value |= CCM_AHB_GATING_EHCI1; /* AHB clock gate ehci1 */
129 ccm_write_4(sc, CCM_AHB_GATING0, reg_value);
131 /* Enable clock for USB */
132 reg_value = ccm_read_4(sc, CCM_USB_CLK);
133 reg_value |= CCM_USB_PHY; /* USBPHY */
134 reg_value |= CCM_USB0_RESET; /* disable reset for USB0 */
135 reg_value |= CCM_USB1_RESET; /* disable reset for USB1 */
136 reg_value |= CCM_USB2_RESET; /* disable reset for USB2 */
137 ccm_write_4(sc, CCM_USB_CLK, reg_value);
143 a10_clk_usb_deactivate(void)
145 struct a10_ccm_softc *sc = a10_ccm_sc;
151 /* Disable clock for USB */
152 reg_value = ccm_read_4(sc, CCM_USB_CLK);
153 reg_value &= ~CCM_USB_PHY; /* USBPHY */
154 reg_value &= ~CCM_USB0_RESET; /* reset for USB0 */
155 reg_value &= ~CCM_USB1_RESET; /* reset for USB1 */
156 reg_value &= ~CCM_USB2_RESET; /* reset for USB2 */
157 ccm_write_4(sc, CCM_USB_CLK, reg_value);
159 /* Disable gating AHB clock for USB */
160 reg_value = ccm_read_4(sc, CCM_AHB_GATING0);
161 reg_value &= ~CCM_AHB_GATING_USB0; /* disable AHB clock gate usb0 */
162 reg_value &= ~CCM_AHB_GATING_EHCI0; /* disable AHB clock gate ehci0 */
163 reg_value &= ~CCM_AHB_GATING_EHCI1; /* disable AHB clock gate ehci1 */
164 ccm_write_4(sc, CCM_AHB_GATING0, reg_value);
170 a10_clk_emac_activate(void)
172 struct a10_ccm_softc *sc = a10_ccm_sc;
178 /* Gating AHB clock for EMAC */
179 reg_value = ccm_read_4(sc, CCM_AHB_GATING0);
180 reg_value |= CCM_AHB_GATING_EMAC;
181 ccm_write_4(sc, CCM_AHB_GATING0, reg_value);
187 a10_clk_gmac_activate(phandle_t node)
190 struct a10_ccm_softc *sc;
197 /* Gating AHB clock for GMAC */
198 reg_value = ccm_read_4(sc, CCM_AHB_GATING1);
199 reg_value |= CCM_AHB_GATING_GMAC;
200 ccm_write_4(sc, CCM_AHB_GATING1, reg_value);
203 reg_value = CCM_GMAC_CLK_MII;
204 if (OF_getprop_alloc(node, "phy-mode", 1, (void **)&phy_type) > 0) {
205 if (strcasecmp(phy_type, "rgmii") == 0)
206 reg_value = CCM_GMAC_CLK_RGMII | CCM_GMAC_MODE_RGMII;
207 else if (strcasecmp(phy_type, "rgmii-bpi") == 0) {
208 reg_value = CCM_GMAC_CLK_RGMII | CCM_GMAC_MODE_RGMII;
209 reg_value |= (3 << CCM_GMAC_CLK_DELAY_SHIFT);
211 free(phy_type, M_OFWPROP);
213 ccm_write_4(sc, CCM_GMAC_CLK, reg_value);
219 a10_clk_pll6_enable(void)
221 struct a10_ccm_softc *sc;
225 * SATA needs PLL6 to be a 100MHz clock.
226 * The SATA output frequency is 24MHz * n * k / m / 6.
227 * To get to 100MHz, k & m must be equal and n must be 25.
228 * For other uses the output frequency is 24MHz * n * k / 2.
231 if (sc->pll6_enabled)
233 reg_value = ccm_read_4(sc, CCM_PLL6_CFG);
234 reg_value &= ~CCM_PLL_CFG_BYPASS;
235 reg_value &= ~(CCM_PLL_CFG_FACTOR_K | CCM_PLL_CFG_FACTOR_M |
236 CCM_PLL_CFG_FACTOR_N);
237 reg_value |= (25 << CCM_PLL_CFG_FACTOR_N_SHIFT);
238 reg_value |= CCM_PLL6_CFG_SATA_CLKEN;
239 reg_value |= CCM_PLL_CFG_ENABLE;
240 ccm_write_4(sc, CCM_PLL6_CFG, reg_value);
241 sc->pll6_enabled = 1;
245 a10_clk_pll6_get_rate(void)
247 struct a10_ccm_softc *sc;
248 uint32_t k, n, reg_value;
251 reg_value = ccm_read_4(sc, CCM_PLL6_CFG);
252 n = ((reg_value & CCM_PLL_CFG_FACTOR_N) >> CCM_PLL_CFG_FACTOR_N_SHIFT);
253 k = ((reg_value & CCM_PLL_CFG_FACTOR_K) >> CCM_PLL_CFG_FACTOR_K_SHIFT) +
256 return ((CCM_CLK_REF_FREQ * n * k) / 2);
260 a10_clk_pll2_set_rate(unsigned int freq)
262 struct a10_ccm_softc *sc;
264 unsigned int prediv, postdiv, n;
270 reg_value = ccm_read_4(sc, CCM_PLL2_CFG);
271 reg_value &= ~(CCM_PLL2_CFG_PREDIV | CCM_PLL2_CFG_POSTDIV |
272 CCM_PLL_CFG_FACTOR_N);
275 * Audio Codec needs PLL2 to be either 24576000 Hz or 22579200 Hz
277 * PLL2 output frequency is 24MHz * n / prediv / postdiv.
278 * To get as close as possible to the desired rate, we use a
279 * pre-divider of 21 and a post-divider of 4. With these values,
280 * a multiplier of 86 or 79 gets us close to the target rates.
288 reg_value |= CCM_PLL_CFG_ENABLE;
292 reg_value |= CCM_PLL_CFG_ENABLE;
296 reg_value &= ~CCM_PLL_CFG_ENABLE;
302 reg_value |= (prediv << CCM_PLL2_CFG_PREDIV_SHIFT);
303 reg_value |= (postdiv << CCM_PLL2_CFG_POSTDIV_SHIFT);
304 reg_value |= (n << CCM_PLL_CFG_FACTOR_N_SHIFT);
305 ccm_write_4(sc, CCM_PLL2_CFG, reg_value);
311 a10_clk_ahci_activate(void)
313 struct a10_ccm_softc *sc;
320 a10_clk_pll6_enable();
322 /* Gating AHB clock for SATA */
323 reg_value = ccm_read_4(sc, CCM_AHB_GATING0);
324 reg_value |= CCM_AHB_GATING_SATA;
325 ccm_write_4(sc, CCM_AHB_GATING0, reg_value);
328 ccm_write_4(sc, CCM_SATA_CLK, CCM_PLL_CFG_ENABLE);
334 a10_clk_mmc_activate(int devid)
336 struct a10_ccm_softc *sc;
343 a10_clk_pll6_enable();
345 /* Gating AHB clock for SD/MMC */
346 reg_value = ccm_read_4(sc, CCM_AHB_GATING0);
347 reg_value |= CCM_AHB_GATING_SDMMC0 << devid;
348 ccm_write_4(sc, CCM_AHB_GATING0, reg_value);
354 a10_clk_mmc_cfg(int devid, int freq)
356 struct a10_ccm_softc *sc;
357 uint32_t clksrc, m, n, ophase, phase, reg_value;
358 unsigned int pll_freq;
366 pll_freq = CCM_CLK_REF_FREQ / 1000;
367 clksrc = CCM_SD_CLK_SRC_SEL_OSC24M;
371 } else if (freq <= 25000) {
372 pll_freq = a10_clk_pll6_get_rate() / 1000;
373 clksrc = CCM_SD_CLK_SRC_SEL_PLL6;
377 } else if (freq <= 50000) {
378 pll_freq = a10_clk_pll6_get_rate() / 1000;
379 clksrc = CCM_SD_CLK_SRC_SEL_PLL6;
385 m = ((pll_freq / (1 << n)) / (freq)) - 1;
386 reg_value = ccm_read_4(sc, CCM_MMC0_SCLK_CFG + (devid * 4));
387 reg_value &= ~CCM_SD_CLK_SRC_SEL;
388 reg_value |= (clksrc << CCM_SD_CLK_SRC_SEL_SHIFT);
389 reg_value &= ~CCM_SD_CLK_PHASE_CTR;
390 reg_value |= (phase << CCM_SD_CLK_PHASE_CTR_SHIFT);
391 reg_value &= ~CCM_SD_CLK_DIV_RATIO_N;
392 reg_value |= (n << CCM_SD_CLK_DIV_RATIO_N_SHIFT);
393 reg_value &= ~CCM_SD_CLK_OPHASE_CTR;
394 reg_value |= (ophase << CCM_SD_CLK_OPHASE_CTR_SHIFT);
395 reg_value &= ~CCM_SD_CLK_DIV_RATIO_M;
397 reg_value |= CCM_PLL_CFG_ENABLE;
398 ccm_write_4(sc, CCM_MMC0_SCLK_CFG + (devid * 4), reg_value);
404 a10_clk_dmac_activate(void)
406 struct a10_ccm_softc *sc;
413 /* Gating AHB clock for DMA controller */
414 reg_value = ccm_read_4(sc, CCM_AHB_GATING0);
415 reg_value |= CCM_AHB_GATING_DMA;
416 ccm_write_4(sc, CCM_AHB_GATING0, reg_value);
422 a10_clk_codec_activate(unsigned int freq)
424 struct a10_ccm_softc *sc;
431 a10_clk_pll2_set_rate(freq);
433 /* Gating APB clock for ADDA */
434 reg_value = ccm_read_4(sc, CCM_APB0_GATING);
435 reg_value |= CCM_APB0_GATING_ADDA;
436 ccm_write_4(sc, CCM_APB0_GATING, reg_value);
438 /* Enable audio codec clock */
439 reg_value = ccm_read_4(sc, CCM_AUDIO_CODEC_CLK);
440 reg_value |= CCM_AUDIO_CODEC_ENABLE;
441 ccm_write_4(sc, CCM_AUDIO_CODEC_CLK, reg_value);