Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux/fpc-iii.git] / arch / arm / mach-omap2 / cm2xxx.c
blobce25abbcffae1a7fae7bfe3bb0ee6855ec84b03e
1 /*
2 * OMAP2xxx CM module functions
4 * Copyright (C) 2009 Nokia Corporation
5 * Copyright (C) 2008-2010, 2012 Texas Instruments, Inc.
6 * Paul Walmsley
7 * Rajendra Nayak <rnayak@ti.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/kernel.h>
15 #include <linux/types.h>
16 #include <linux/delay.h>
17 #include <linux/errno.h>
18 #include <linux/err.h>
19 #include <linux/io.h>
21 #include "soc.h"
22 #include "iomap.h"
23 #include "common.h"
24 #include "prm2xxx.h"
25 #include "cm.h"
26 #include "cm2xxx.h"
27 #include "cm-regbits-24xx.h"
28 #include "clockdomain.h"
30 /* CM_AUTOIDLE_PLL.AUTO_* bit values for DPLLs */
31 #define DPLL_AUTOIDLE_DISABLE 0x0
32 #define OMAP2XXX_DPLL_AUTOIDLE_LOW_POWER_STOP 0x3
34 /* CM_AUTOIDLE_PLL.AUTO_* bit values for APLLs (OMAP2xxx only) */
35 #define OMAP2XXX_APLL_AUTOIDLE_DISABLE 0x0
36 #define OMAP2XXX_APLL_AUTOIDLE_LOW_POWER_STOP 0x3
38 /* CM_IDLEST_PLL bit value offset for APLLs (OMAP2xxx only) */
39 #define EN_APLL_LOCKED 3
41 static const u8 omap2xxx_cm_idlest_offs[] = {
42 CM_IDLEST1, CM_IDLEST2, OMAP2430_CM_IDLEST3, OMAP24XX_CM_IDLEST4
49 static void _write_clktrctrl(u8 c, s16 module, u32 mask)
51 u32 v;
53 v = omap2_cm_read_mod_reg(module, OMAP2_CM_CLKSTCTRL);
54 v &= ~mask;
55 v |= c << __ffs(mask);
56 omap2_cm_write_mod_reg(v, module, OMAP2_CM_CLKSTCTRL);
59 bool omap2xxx_cm_is_clkdm_in_hwsup(s16 module, u32 mask)
61 u32 v;
63 v = omap2_cm_read_mod_reg(module, OMAP2_CM_CLKSTCTRL);
64 v &= mask;
65 v >>= __ffs(mask);
67 return (v == OMAP24XX_CLKSTCTRL_ENABLE_AUTO) ? 1 : 0;
70 void omap2xxx_cm_clkdm_enable_hwsup(s16 module, u32 mask)
72 _write_clktrctrl(OMAP24XX_CLKSTCTRL_ENABLE_AUTO, module, mask);
75 void omap2xxx_cm_clkdm_disable_hwsup(s16 module, u32 mask)
77 _write_clktrctrl(OMAP24XX_CLKSTCTRL_DISABLE_AUTO, module, mask);
81 * DPLL autoidle control
84 static void _omap2xxx_set_dpll_autoidle(u8 m)
86 u32 v;
88 v = omap2_cm_read_mod_reg(PLL_MOD, CM_AUTOIDLE);
89 v &= ~OMAP24XX_AUTO_DPLL_MASK;
90 v |= m << OMAP24XX_AUTO_DPLL_SHIFT;
91 omap2_cm_write_mod_reg(v, PLL_MOD, CM_AUTOIDLE);
94 void omap2xxx_cm_set_dpll_disable_autoidle(void)
96 _omap2xxx_set_dpll_autoidle(OMAP2XXX_DPLL_AUTOIDLE_LOW_POWER_STOP);
99 void omap2xxx_cm_set_dpll_auto_low_power_stop(void)
101 _omap2xxx_set_dpll_autoidle(DPLL_AUTOIDLE_DISABLE);
105 * APLL control
108 static void _omap2xxx_set_apll_autoidle(u8 m, u32 mask)
110 u32 v;
112 v = omap2_cm_read_mod_reg(PLL_MOD, CM_AUTOIDLE);
113 v &= ~mask;
114 v |= m << __ffs(mask);
115 omap2_cm_write_mod_reg(v, PLL_MOD, CM_AUTOIDLE);
118 void omap2xxx_cm_set_apll54_disable_autoidle(void)
120 _omap2xxx_set_apll_autoidle(OMAP2XXX_APLL_AUTOIDLE_LOW_POWER_STOP,
121 OMAP24XX_AUTO_54M_MASK);
124 void omap2xxx_cm_set_apll54_auto_low_power_stop(void)
126 _omap2xxx_set_apll_autoidle(OMAP2XXX_APLL_AUTOIDLE_DISABLE,
127 OMAP24XX_AUTO_54M_MASK);
130 void omap2xxx_cm_set_apll96_disable_autoidle(void)
132 _omap2xxx_set_apll_autoidle(OMAP2XXX_APLL_AUTOIDLE_LOW_POWER_STOP,
133 OMAP24XX_AUTO_96M_MASK);
136 void omap2xxx_cm_set_apll96_auto_low_power_stop(void)
138 _omap2xxx_set_apll_autoidle(OMAP2XXX_APLL_AUTOIDLE_DISABLE,
139 OMAP24XX_AUTO_96M_MASK);
142 /* Enable an APLL if off */
143 static int _omap2xxx_apll_enable(u8 enable_bit, u8 status_bit)
145 u32 v, m;
147 m = EN_APLL_LOCKED << enable_bit;
149 v = omap2_cm_read_mod_reg(PLL_MOD, CM_CLKEN);
150 if (v & m)
151 return 0; /* apll already enabled */
153 v |= m;
154 omap2_cm_write_mod_reg(v, PLL_MOD, CM_CLKEN);
156 omap2xxx_cm_wait_module_ready(PLL_MOD, 1, status_bit);
159 * REVISIT: Should we return an error code if
160 * omap2xxx_cm_wait_module_ready() fails?
162 return 0;
165 /* Stop APLL */
166 static void _omap2xxx_apll_disable(u8 enable_bit)
168 u32 v;
170 v = omap2_cm_read_mod_reg(PLL_MOD, CM_CLKEN);
171 v &= ~(EN_APLL_LOCKED << enable_bit);
172 omap2_cm_write_mod_reg(v, PLL_MOD, CM_CLKEN);
175 /* Enable an APLL if off */
176 int omap2xxx_cm_apll54_enable(void)
178 return _omap2xxx_apll_enable(OMAP24XX_EN_54M_PLL_SHIFT,
179 OMAP24XX_ST_54M_APLL_SHIFT);
182 /* Enable an APLL if off */
183 int omap2xxx_cm_apll96_enable(void)
185 return _omap2xxx_apll_enable(OMAP24XX_EN_96M_PLL_SHIFT,
186 OMAP24XX_ST_96M_APLL_SHIFT);
189 /* Stop APLL */
190 void omap2xxx_cm_apll54_disable(void)
192 _omap2xxx_apll_disable(OMAP24XX_EN_54M_PLL_SHIFT);
195 /* Stop APLL */
196 void omap2xxx_cm_apll96_disable(void)
198 _omap2xxx_apll_disable(OMAP24XX_EN_96M_PLL_SHIFT);
202 * omap2xxx_cm_split_idlest_reg - split CM_IDLEST reg addr into its components
203 * @idlest_reg: CM_IDLEST* virtual address
204 * @prcm_inst: pointer to an s16 to return the PRCM instance offset
205 * @idlest_reg_id: pointer to a u8 to return the CM_IDLESTx register ID
207 * XXX This function is only needed until absolute register addresses are
208 * removed from the OMAP struct clk records.
210 int omap2xxx_cm_split_idlest_reg(void __iomem *idlest_reg, s16 *prcm_inst,
211 u8 *idlest_reg_id)
213 unsigned long offs;
214 u8 idlest_offs;
215 int i;
217 if (idlest_reg < cm_base || idlest_reg > (cm_base + 0x0fff))
218 return -EINVAL;
220 idlest_offs = (unsigned long)idlest_reg & 0xff;
221 for (i = 0; i < ARRAY_SIZE(omap2xxx_cm_idlest_offs); i++) {
222 if (idlest_offs == omap2xxx_cm_idlest_offs[i]) {
223 *idlest_reg_id = i + 1;
224 break;
228 if (i == ARRAY_SIZE(omap2xxx_cm_idlest_offs))
229 return -EINVAL;
231 offs = idlest_reg - cm_base;
232 offs &= 0xff00;
233 *prcm_inst = offs;
235 return 0;
243 * omap2xxx_cm_wait_module_ready - wait for a module to leave idle or standby
244 * @prcm_mod: PRCM module offset
245 * @idlest_id: CM_IDLESTx register ID (i.e., x = 1, 2, 3)
246 * @idlest_shift: shift of the bit in the CM_IDLEST* register to check
248 * Wait for the PRCM to indicate that the module identified by
249 * (@prcm_mod, @idlest_id, @idlest_shift) is clocked. Return 0 upon
250 * success or -EBUSY if the module doesn't enable in time.
252 int omap2xxx_cm_wait_module_ready(s16 prcm_mod, u8 idlest_id, u8 idlest_shift)
254 int ena = 0, i = 0;
255 u8 cm_idlest_reg;
256 u32 mask;
258 if (!idlest_id || (idlest_id > ARRAY_SIZE(omap2xxx_cm_idlest_offs)))
259 return -EINVAL;
261 cm_idlest_reg = omap2xxx_cm_idlest_offs[idlest_id - 1];
263 mask = 1 << idlest_shift;
264 ena = mask;
266 omap_test_timeout(((omap2_cm_read_mod_reg(prcm_mod, cm_idlest_reg) &
267 mask) == ena), MAX_MODULE_READY_TIME, i);
269 return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
272 /* Clockdomain low-level functions */
274 static void omap2xxx_clkdm_allow_idle(struct clockdomain *clkdm)
276 omap2xxx_cm_clkdm_enable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
277 clkdm->clktrctrl_mask);
280 static void omap2xxx_clkdm_deny_idle(struct clockdomain *clkdm)
282 omap2xxx_cm_clkdm_disable_hwsup(clkdm->pwrdm.ptr->prcm_offs,
283 clkdm->clktrctrl_mask);
286 static int omap2xxx_clkdm_clk_enable(struct clockdomain *clkdm)
288 bool hwsup = false;
290 if (!clkdm->clktrctrl_mask)
291 return 0;
293 hwsup = omap2xxx_cm_is_clkdm_in_hwsup(clkdm->pwrdm.ptr->prcm_offs,
294 clkdm->clktrctrl_mask);
295 if (!hwsup && clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
296 omap2xxx_clkdm_wakeup(clkdm);
298 return 0;
301 static int omap2xxx_clkdm_clk_disable(struct clockdomain *clkdm)
303 bool hwsup = false;
305 if (!clkdm->clktrctrl_mask)
306 return 0;
308 hwsup = omap2xxx_cm_is_clkdm_in_hwsup(clkdm->pwrdm.ptr->prcm_offs,
309 clkdm->clktrctrl_mask);
311 if (!hwsup && clkdm->flags & CLKDM_CAN_FORCE_SLEEP)
312 omap2xxx_clkdm_sleep(clkdm);
314 return 0;
317 struct clkdm_ops omap2_clkdm_operations = {
318 .clkdm_add_wkdep = omap2_clkdm_add_wkdep,
319 .clkdm_del_wkdep = omap2_clkdm_del_wkdep,
320 .clkdm_read_wkdep = omap2_clkdm_read_wkdep,
321 .clkdm_clear_all_wkdeps = omap2_clkdm_clear_all_wkdeps,
322 .clkdm_sleep = omap2xxx_clkdm_sleep,
323 .clkdm_wakeup = omap2xxx_clkdm_wakeup,
324 .clkdm_allow_idle = omap2xxx_clkdm_allow_idle,
325 .clkdm_deny_idle = omap2xxx_clkdm_deny_idle,
326 .clkdm_clk_enable = omap2xxx_clkdm_clk_enable,
327 .clkdm_clk_disable = omap2xxx_clkdm_clk_disable,
330 int omap2xxx_cm_fclks_active(void)
332 u32 f1, f2;
334 f1 = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
335 f2 = omap2_cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
337 return (f1 | f2) ? 1 : 0;
340 int omap2xxx_cm_mpu_retention_allowed(void)
342 u32 l;
344 /* Check for MMC, UART2, UART1, McSPI2, McSPI1 and DSS1. */
345 l = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
346 if (l & (OMAP2420_EN_MMC_MASK | OMAP24XX_EN_UART2_MASK |
347 OMAP24XX_EN_UART1_MASK | OMAP24XX_EN_MCSPI2_MASK |
348 OMAP24XX_EN_MCSPI1_MASK | OMAP24XX_EN_DSS1_MASK))
349 return 0;
350 /* Check for UART3. */
351 l = omap2_cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
352 if (l & OMAP24XX_EN_UART3_MASK)
353 return 0;
355 return 1;
358 u32 omap2xxx_cm_get_core_clk_src(void)
360 u32 v;
362 v = omap2_cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
363 v &= OMAP24XX_CORE_CLK_SRC_MASK;
365 return v;
368 u32 omap2xxx_cm_get_core_pll_config(void)
370 return omap2_cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
373 u32 omap2xxx_cm_get_pll_config(void)
375 return omap2_cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
378 u32 omap2xxx_cm_get_pll_status(void)
380 return omap2_cm_read_mod_reg(PLL_MOD, CM_CLKEN);
383 void omap2xxx_cm_set_mod_dividers(u32 mpu, u32 dsp, u32 gfx, u32 core, u32 mdm)
385 u32 tmp;
387 omap2_cm_write_mod_reg(mpu, MPU_MOD, CM_CLKSEL);
388 omap2_cm_write_mod_reg(dsp, OMAP24XX_DSP_MOD, CM_CLKSEL);
389 omap2_cm_write_mod_reg(gfx, GFX_MOD, CM_CLKSEL);
390 tmp = omap2_cm_read_mod_reg(CORE_MOD, CM_CLKSEL1) &
391 OMAP24XX_CLKSEL_DSS2_MASK;
392 omap2_cm_write_mod_reg(core | tmp, CORE_MOD, CM_CLKSEL1);
393 if (cpu_is_omap2430())
394 omap2_cm_write_mod_reg(mdm, OMAP2430_MDM_MOD, CM_CLKSEL);
401 static struct cm_ll_data omap2xxx_cm_ll_data = {
402 .split_idlest_reg = &omap2xxx_cm_split_idlest_reg,
403 .wait_module_ready = &omap2xxx_cm_wait_module_ready,
406 int __init omap2xxx_cm_init(void)
408 if (!cpu_is_omap24xx())
409 return 0;
411 return cm_register(&omap2xxx_cm_ll_data);
414 static void __exit omap2xxx_cm_exit(void)
416 if (!cpu_is_omap24xx())
417 return;
419 /* Should never happen */
420 WARN(cm_unregister(&omap2xxx_cm_ll_data),
421 "%s: cm_ll_data function pointer mismatch\n", __func__);
423 __exitcall(omap2xxx_cm_exit);