2 * OMAP2/3 PRM module functions
4 * Copyright (C) 2010-2011 Texas Instruments, Inc.
5 * Copyright (C) 2010 Nokia Corporation
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/errno.h>
16 #include <linux/err.h>
21 #include <plat/prcm.h>
25 #include "prm2xxx_3xxx.h"
26 #include "cm2xxx_3xxx.h"
27 #include "prm-regbits-24xx.h"
28 #include "prm-regbits-34xx.h"
30 static const struct omap_prcm_irq omap3_prcm_irqs[] = {
31 OMAP_PRCM_IRQ("wkup", 0, 0),
32 OMAP_PRCM_IRQ("io", 9, 1),
35 static struct omap_prcm_irq_setup omap3_prcm_irq_setup = {
36 .ack = OMAP3_PRM_IRQSTATUS_MPU_OFFSET,
37 .mask = OMAP3_PRM_IRQENABLE_MPU_OFFSET,
39 .irqs = omap3_prcm_irqs,
40 .nr_irqs = ARRAY_SIZE(omap3_prcm_irqs),
41 .irq = INT_34XX_PRCM_MPU_IRQ,
42 .read_pending_irqs = &omap3xxx_prm_read_pending_irqs,
43 .ocp_barrier = &omap3xxx_prm_ocp_barrier,
44 .save_and_clear_irqen = &omap3xxx_prm_save_and_clear_irqen,
45 .restore_irqen = &omap3xxx_prm_restore_irqen,
48 u32 omap2_prm_read_mod_reg(s16 module, u16 idx)
50 return __raw_readl(prm_base + module + idx);
53 void omap2_prm_write_mod_reg(u32 val, s16 module, u16 idx)
55 __raw_writel(val, prm_base + module + idx);
58 /* Read-modify-write a register in a PRM module. Caller must lock */
59 u32 omap2_prm_rmw_mod_reg_bits(u32 mask, u32 bits, s16 module, s16 idx)
63 v = omap2_prm_read_mod_reg(module, idx);
66 omap2_prm_write_mod_reg(v, module, idx);
71 /* Read a PRM register, AND it, and shift the result down to bit 0 */
72 u32 omap2_prm_read_mod_bits_shift(s16 domain, s16 idx, u32 mask)
76 v = omap2_prm_read_mod_reg(domain, idx);
83 u32 omap2_prm_set_mod_reg_bits(u32 bits, s16 module, s16 idx)
85 return omap2_prm_rmw_mod_reg_bits(bits, bits, module, idx);
88 u32 omap2_prm_clear_mod_reg_bits(u32 bits, s16 module, s16 idx)
90 return omap2_prm_rmw_mod_reg_bits(bits, 0x0, module, idx);
95 * omap2_prm_is_hardreset_asserted - read the HW reset line state of
96 * submodules contained in the hwmod module
97 * @prm_mod: PRM submodule base (e.g. CORE_MOD)
98 * @shift: register bit shift corresponding to the reset line to check
100 * Returns 1 if the (sub)module hardreset line is currently asserted,
101 * 0 if the (sub)module hardreset line is not currently asserted, or
102 * -EINVAL if called while running on a non-OMAP2/3 chip.
104 int omap2_prm_is_hardreset_asserted(s16 prm_mod, u8 shift)
106 if (!(cpu_is_omap24xx() || cpu_is_omap34xx()))
109 return omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTCTRL,
114 * omap2_prm_assert_hardreset - assert the HW reset line of a submodule
115 * @prm_mod: PRM submodule base (e.g. CORE_MOD)
116 * @shift: register bit shift corresponding to the reset line to assert
118 * Some IPs like dsp or iva contain processors that require an HW
119 * reset line to be asserted / deasserted in order to fully enable the
120 * IP. These modules may have multiple hard-reset lines that reset
121 * different 'submodules' inside the IP block. This function will
122 * place the submodule into reset. Returns 0 upon success or -EINVAL
123 * upon an argument error.
125 int omap2_prm_assert_hardreset(s16 prm_mod, u8 shift)
129 if (!(cpu_is_omap24xx() || cpu_is_omap34xx()))
133 omap2_prm_rmw_mod_reg_bits(mask, mask, prm_mod, OMAP2_RM_RSTCTRL);
139 * omap2_prm_deassert_hardreset - deassert a submodule hardreset line and wait
140 * @prm_mod: PRM submodule base (e.g. CORE_MOD)
141 * @rst_shift: register bit shift corresponding to the reset line to deassert
142 * @st_shift: register bit shift for the status of the deasserted submodule
144 * Some IPs like dsp or iva contain processors that require an HW
145 * reset line to be asserted / deasserted in order to fully enable the
146 * IP. These modules may have multiple hard-reset lines that reset
147 * different 'submodules' inside the IP block. This function will
148 * take the submodule out of reset and wait until the PRCM indicates
149 * that the reset has completed before returning. Returns 0 upon success or
150 * -EINVAL upon an argument error, -EEXIST if the submodule was already out
151 * of reset, or -EBUSY if the submodule did not exit reset promptly.
153 int omap2_prm_deassert_hardreset(s16 prm_mod, u8 rst_shift, u8 st_shift)
158 if (!(cpu_is_omap24xx() || cpu_is_omap34xx()))
161 rst = 1 << rst_shift;
164 /* Check the current status to avoid de-asserting the line twice */
165 if (omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTCTRL, rst) == 0)
168 /* Clear the reset status by writing 1 to the status bit */
169 omap2_prm_rmw_mod_reg_bits(0xffffffff, st, prm_mod, OMAP2_RM_RSTST);
170 /* de-assert the reset control line */
171 omap2_prm_rmw_mod_reg_bits(rst, 0, prm_mod, OMAP2_RM_RSTCTRL);
172 /* wait the status to be set */
173 omap_test_timeout(omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTST,
175 MAX_MODULE_HARDRESET_WAIT, c);
177 return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
183 * struct omap3_vp - OMAP3 VP register access description.
184 * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
187 u32 tranxdone_status;
190 static struct omap3_vp omap3_vp[] = {
191 [OMAP3_VP_VDD_MPU_ID] = {
192 .tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK,
194 [OMAP3_VP_VDD_CORE_ID] = {
195 .tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK,
199 #define MAX_VP_ID ARRAY_SIZE(omap3_vp);
201 u32 omap3_prm_vp_check_txdone(u8 vp_id)
203 struct omap3_vp *vp = &omap3_vp[vp_id];
206 irqstatus = omap2_prm_read_mod_reg(OCP_MOD,
207 OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
208 return irqstatus & vp->tranxdone_status;
211 void omap3_prm_vp_clear_txdone(u8 vp_id)
213 struct omap3_vp *vp = &omap3_vp[vp_id];
215 omap2_prm_write_mod_reg(vp->tranxdone_status,
216 OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
219 u32 omap3_prm_vcvp_read(u8 offset)
221 return omap2_prm_read_mod_reg(OMAP3430_GR_MOD, offset);
224 void omap3_prm_vcvp_write(u32 val, u8 offset)
226 omap2_prm_write_mod_reg(val, OMAP3430_GR_MOD, offset);
229 u32 omap3_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
231 return omap2_prm_rmw_mod_reg_bits(mask, bits, OMAP3430_GR_MOD, offset);
235 * omap3xxx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
236 * @events: ptr to a u32, preallocated by caller
238 * Read PRM_IRQSTATUS_MPU bits, AND'ed with the currently-enabled PRM
239 * MPU IRQs, and store the result into the u32 pointed to by @events.
242 void omap3xxx_prm_read_pending_irqs(unsigned long *events)
246 /* XXX Can the mask read be avoided (e.g., can it come from RAM?) */
247 mask = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
248 st = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
250 events[0] = mask & st;
254 * omap3xxx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
256 * Force any buffered writes to the PRM IP block to complete. Needed
257 * by the PRM IRQ handler, which reads and writes directly to the IP
258 * block, to avoid race conditions after acknowledging or clearing IRQ
259 * bits. No return value.
261 void omap3xxx_prm_ocp_barrier(void)
263 omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET);
267 * omap3xxx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU reg
268 * @saved_mask: ptr to a u32 array to save IRQENABLE bits
270 * Save the PRM_IRQENABLE_MPU register to @saved_mask. @saved_mask
271 * must be allocated by the caller. Intended to be used in the PRM
272 * interrupt handler suspend callback. The OCP barrier is needed to
273 * ensure the write to disable PRM interrupts reaches the PRM before
274 * returning; otherwise, spurious interrupts might occur. No return
277 void omap3xxx_prm_save_and_clear_irqen(u32 *saved_mask)
279 saved_mask[0] = omap2_prm_read_mod_reg(OCP_MOD,
280 OMAP3_PRM_IRQENABLE_MPU_OFFSET);
281 omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
284 omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET);
288 * omap3xxx_prm_restore_irqen - set PRM_IRQENABLE_MPU register from args
289 * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
291 * Restore the PRM_IRQENABLE_MPU register from @saved_mask. Intended
292 * to be used in the PRM interrupt handler resume callback to restore
293 * values saved by omap3xxx_prm_save_and_clear_irqen(). No OCP
294 * barrier should be needed here; any pending PRM interrupts will fire
295 * once the writes reach the PRM. No return value.
297 void omap3xxx_prm_restore_irqen(u32 *saved_mask)
299 omap2_prm_write_mod_reg(saved_mask[0], OCP_MOD,
300 OMAP3_PRM_IRQENABLE_MPU_OFFSET);
303 static int __init omap3xxx_prcm_init(void)
305 if (cpu_is_omap34xx())
306 return omap_prcm_register_chain_handler(&omap3_prcm_irq_setup);
309 subsys_initcall(omap3xxx_prcm_init);