2 * OMAP4 PRM module functions
4 * Copyright (C) 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/delay.h>
16 #include <linux/errno.h>
17 #include <linux/err.h>
20 #include <plat/prcm.h>
27 #include "prm-regbits-44xx.h"
29 #include "prminst44xx.h"
31 static const struct omap_prcm_irq omap4_prcm_irqs[] = {
32 OMAP_PRCM_IRQ("wkup", 0, 0),
33 OMAP_PRCM_IRQ("io", 9, 1),
36 static struct omap_prcm_irq_setup omap4_prcm_irq_setup = {
37 .ack = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
38 .mask = OMAP4_PRM_IRQENABLE_MPU_OFFSET,
40 .irqs = omap4_prcm_irqs,
41 .nr_irqs = ARRAY_SIZE(omap4_prcm_irqs),
42 .irq = 11 + OMAP44XX_IRQ_GIC_START,
43 .read_pending_irqs = &omap44xx_prm_read_pending_irqs,
44 .ocp_barrier = &omap44xx_prm_ocp_barrier,
45 .save_and_clear_irqen = &omap44xx_prm_save_and_clear_irqen,
46 .restore_irqen = &omap44xx_prm_restore_irqen,
49 /* PRM low-level functions */
51 /* Read a register in a CM/PRM instance in the PRM module */
52 u32 omap4_prm_read_inst_reg(s16 inst, u16 reg)
54 return __raw_readl(OMAP44XX_PRM_REGADDR(inst, reg));
57 /* Write into a register in a CM/PRM instance in the PRM module */
58 void omap4_prm_write_inst_reg(u32 val, s16 inst, u16 reg)
60 __raw_writel(val, OMAP44XX_PRM_REGADDR(inst, reg));
63 /* Read-modify-write a register in a PRM module. Caller must lock */
64 u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 reg)
68 v = omap4_prm_read_inst_reg(inst, reg);
71 omap4_prm_write_inst_reg(v, inst, reg);
79 * struct omap4_vp - OMAP4 VP register access description.
80 * @irqstatus_mpu: offset to IRQSTATUS_MPU register for VP
81 * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
88 static struct omap4_vp omap4_vp[] = {
89 [OMAP4_VP_VDD_MPU_ID] = {
90 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET,
91 .tranxdone_status = OMAP4430_VP_MPU_TRANXDONE_ST_MASK,
93 [OMAP4_VP_VDD_IVA_ID] = {
94 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
95 .tranxdone_status = OMAP4430_VP_IVA_TRANXDONE_ST_MASK,
97 [OMAP4_VP_VDD_CORE_ID] = {
98 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
99 .tranxdone_status = OMAP4430_VP_CORE_TRANXDONE_ST_MASK,
103 u32 omap4_prm_vp_check_txdone(u8 vp_id)
105 struct omap4_vp *vp = &omap4_vp[vp_id];
108 irqstatus = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
109 OMAP4430_PRM_OCP_SOCKET_INST,
111 return irqstatus & vp->tranxdone_status;
114 void omap4_prm_vp_clear_txdone(u8 vp_id)
116 struct omap4_vp *vp = &omap4_vp[vp_id];
118 omap4_prminst_write_inst_reg(vp->tranxdone_status,
119 OMAP4430_PRM_PARTITION,
120 OMAP4430_PRM_OCP_SOCKET_INST,
124 u32 omap4_prm_vcvp_read(u8 offset)
126 return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
127 OMAP4430_PRM_DEVICE_INST, offset);
130 void omap4_prm_vcvp_write(u32 val, u8 offset)
132 omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION,
133 OMAP4430_PRM_DEVICE_INST, offset);
136 u32 omap4_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
138 return omap4_prminst_rmw_inst_reg_bits(mask, bits,
139 OMAP4430_PRM_PARTITION,
140 OMAP4430_PRM_DEVICE_INST,
144 static inline u32 _read_pending_irq_reg(u16 irqen_offs, u16 irqst_offs)
148 /* XXX read mask from RAM? */
149 mask = omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
151 st = omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST, irqst_offs);
157 * omap44xx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
158 * @events: ptr to two consecutive u32s, preallocated by caller
160 * Read PRM_IRQSTATUS_MPU* bits, AND'ed with the currently-enabled PRM
161 * MPU IRQs, and store the result into the two u32s pointed to by @events.
164 void omap44xx_prm_read_pending_irqs(unsigned long *events)
166 events[0] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_OFFSET,
167 OMAP4_PRM_IRQSTATUS_MPU_OFFSET);
169 events[1] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_2_OFFSET,
170 OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);
174 * omap44xx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
176 * Force any buffered writes to the PRM IP block to complete. Needed
177 * by the PRM IRQ handler, which reads and writes directly to the IP
178 * block, to avoid race conditions after acknowledging or clearing IRQ
179 * bits. No return value.
181 void omap44xx_prm_ocp_barrier(void)
183 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
184 OMAP4_REVISION_PRM_OFFSET);
188 * omap44xx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU* regs
189 * @saved_mask: ptr to a u32 array to save IRQENABLE bits
191 * Save the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers to
192 * @saved_mask. @saved_mask must be allocated by the caller.
193 * Intended to be used in the PRM interrupt handler suspend callback.
194 * The OCP barrier is needed to ensure the write to disable PRM
195 * interrupts reaches the PRM before returning; otherwise, spurious
196 * interrupts might occur. No return value.
198 void omap44xx_prm_save_and_clear_irqen(u32 *saved_mask)
201 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
202 OMAP4_PRM_IRQSTATUS_MPU_OFFSET);
204 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
205 OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);
207 omap4_prm_write_inst_reg(0, OMAP4430_PRM_OCP_SOCKET_INST,
208 OMAP4_PRM_IRQENABLE_MPU_OFFSET);
209 omap4_prm_write_inst_reg(0, OMAP4430_PRM_OCP_SOCKET_INST,
210 OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
213 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
214 OMAP4_REVISION_PRM_OFFSET);
218 * omap44xx_prm_restore_irqen - set PRM_IRQENABLE_MPU* registers from args
219 * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
221 * Restore the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers from
222 * @saved_mask. Intended to be used in the PRM interrupt handler resume
223 * callback to restore values saved by omap44xx_prm_save_and_clear_irqen().
224 * No OCP barrier should be needed here; any pending PRM interrupts will fire
225 * once the writes reach the PRM. No return value.
227 void omap44xx_prm_restore_irqen(u32 *saved_mask)
229 omap4_prm_write_inst_reg(saved_mask[0], OMAP4430_PRM_OCP_SOCKET_INST,
230 OMAP4_PRM_IRQENABLE_MPU_OFFSET);
231 omap4_prm_write_inst_reg(saved_mask[1], OMAP4430_PRM_OCP_SOCKET_INST,
232 OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
236 * omap44xx_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain
238 * Clear any previously-latched I/O wakeup events and ensure that the
239 * I/O wakeup gates are aligned with the current mux settings. Works
240 * by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then
241 * deasserting WUCLKIN and waiting for WUCLKOUT to be deasserted.
242 * No return value. XXX Are the final two steps necessary?
244 void omap44xx_prm_reconfigure_io_chain(void)
248 /* Trigger WUCLKIN enable */
249 omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK,
250 OMAP4430_WUCLK_CTRL_MASK,
251 OMAP4430_PRM_DEVICE_INST,
252 OMAP4_PRM_IO_PMCTRL_OFFSET);
254 (((omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
255 OMAP4_PRM_IO_PMCTRL_OFFSET) &
256 OMAP4430_WUCLK_STATUS_MASK) >>
257 OMAP4430_WUCLK_STATUS_SHIFT) == 1),
258 MAX_IOPAD_LATCH_TIME, i);
259 if (i == MAX_IOPAD_LATCH_TIME)
260 pr_warn("PRM: I/O chain clock line assertion timed out\n");
262 /* Trigger WUCLKIN disable */
263 omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK, 0x0,
264 OMAP4430_PRM_DEVICE_INST,
265 OMAP4_PRM_IO_PMCTRL_OFFSET);
267 (((omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
268 OMAP4_PRM_IO_PMCTRL_OFFSET) &
269 OMAP4430_WUCLK_STATUS_MASK) >>
270 OMAP4430_WUCLK_STATUS_SHIFT) == 0),
271 MAX_IOPAD_LATCH_TIME, i);
272 if (i == MAX_IOPAD_LATCH_TIME)
273 pr_warn("PRM: I/O chain clock line deassertion timed out\n");
279 * omap44xx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches
281 * Activates the I/O wakeup event latches and allows events logged by
282 * those latches to signal a wakeup event to the PRCM. For I/O wakeups
283 * to occur, WAKEUPENABLE bits must be set in the pad mux registers, and
284 * omap44xx_prm_reconfigure_io_chain() must be called. No return value.
286 static void __init omap44xx_prm_enable_io_wakeup(void)
288 omap4_prm_rmw_inst_reg_bits(OMAP4430_GLOBAL_WUEN_MASK,
289 OMAP4430_GLOBAL_WUEN_MASK,
290 OMAP4430_PRM_DEVICE_INST,
291 OMAP4_PRM_IO_PMCTRL_OFFSET);
294 static int __init omap4xxx_prcm_init(void)
296 if (cpu_is_omap44xx()) {
297 omap44xx_prm_enable_io_wakeup();
298 return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);
302 subsys_initcall(omap4xxx_prcm_init);