^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2019-2020 Linaro Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/soc/qcom/smem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/soc/qcom/smem_state.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include "ipa_smp2p.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "ipa.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "ipa_uc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "ipa_clock.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * DOC: IPA SMP2P communication with the modem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * SMP2P is a primitive communication mechanism available between the AP and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * the modem. The IPA driver uses this for two purposes: to enable the modem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * to state that the GSI hardware is ready to use; and to communicate the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * state of the IPA clock in the event of a crash.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * GSI needs to have early initialization completed before it can be used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * This initialization is done either by Trust Zone or by the modem. In the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * latter case, the modem uses an SMP2P interrupt to tell the AP IPA driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * when the GSI is ready to use.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * The modem is also able to inquire about the current state of the IPA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * clock by trigging another SMP2P interrupt to the AP. We communicate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * whether the clock is enabled using two SMP2P state bits--one to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * indicate the clock state (on or off), and a second to indicate the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * clock state bit is valid. The modem will poll the valid bit until it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * is set, and at that time records whether the AP has the IPA clock enabled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * Finally, if the AP kernel panics, we update the SMP2P state bits even if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * we never receive an interrupt from the modem requesting this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * struct ipa_smp2p - IPA SMP2P information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * @ipa: IPA pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * @valid_state: SMEM state indicating enabled state is valid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * @enabled_state: SMEM state to indicate clock is enabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * @valid_bit: Valid bit in 32-bit SMEM state mask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * @enabled_bit: Enabled bit in 32-bit SMEM state mask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * @enabled_bit: Enabled bit in 32-bit SMEM state mask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * @clock_query_irq: IPA interrupt triggered by modem for clock query
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * @setup_ready_irq: IPA interrupt triggered by modem to signal GSI ready
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * @clock_on: Whether IPA clock is on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * @notified: Whether modem has been notified of clock state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * @disabled: Whether setup ready interrupt handling is disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * @mutex: Mutex protecting ready-interrupt/shutdown interlock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * @panic_notifier: Panic notifier structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct ipa_smp2p {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct ipa *ipa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct qcom_smem_state *valid_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct qcom_smem_state *enabled_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) u32 valid_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) u32 enabled_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) u32 clock_query_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) u32 setup_ready_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) bool clock_on;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) bool notified;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) bool disabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct mutex mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct notifier_block panic_notifier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * ipa_smp2p_notify() - use SMP2P to tell modem about IPA clock state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * @smp2p: SMP2P information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * This is called either when the modem has requested it (by triggering
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * the modem clock query IPA interrupt) or whenever the AP is shutting down
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * (via a panic notifier). It sets the two SMP2P state bits--one saying
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * whether the IPA clock is running, and the other indicating the first bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * is valid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static void ipa_smp2p_notify(struct ipa_smp2p *smp2p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) u32 value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) u32 mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (smp2p->notified)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) smp2p->clock_on = ipa_clock_get_additional(smp2p->ipa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /* Signal whether the clock is enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) mask = BIT(smp2p->enabled_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) value = smp2p->clock_on ? mask : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) qcom_smem_state_update_bits(smp2p->enabled_state, mask, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* Now indicate that the enabled flag is valid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) mask = BIT(smp2p->valid_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) value = mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) qcom_smem_state_update_bits(smp2p->valid_state, mask, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) smp2p->notified = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* Threaded IRQ handler for modem "ipa-clock-query" SMP2P interrupt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static irqreturn_t ipa_smp2p_modem_clk_query_isr(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct ipa_smp2p *smp2p = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ipa_smp2p_notify(smp2p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static int ipa_smp2p_panic_notifier(struct notifier_block *nb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) unsigned long action, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) struct ipa_smp2p *smp2p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) smp2p = container_of(nb, struct ipa_smp2p, panic_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) ipa_smp2p_notify(smp2p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (smp2p->clock_on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) ipa_uc_panic_notifier(smp2p->ipa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static int ipa_smp2p_panic_notifier_register(struct ipa_smp2p *smp2p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) /* IPA panic handler needs to run before modem shuts down */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) smp2p->panic_notifier.notifier_call = ipa_smp2p_panic_notifier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) smp2p->panic_notifier.priority = INT_MAX; /* Do it early */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return atomic_notifier_chain_register(&panic_notifier_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) &smp2p->panic_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static void ipa_smp2p_panic_notifier_unregister(struct ipa_smp2p *smp2p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) atomic_notifier_chain_unregister(&panic_notifier_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) &smp2p->panic_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* Threaded IRQ handler for modem "ipa-setup-ready" SMP2P interrupt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) static irqreturn_t ipa_smp2p_modem_setup_ready_isr(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct ipa_smp2p *smp2p = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) mutex_lock(&smp2p->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (!smp2p->disabled) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) ret = ipa_setup(smp2p->ipa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) dev_err(&smp2p->ipa->pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) "error %d from ipa_setup()\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) smp2p->disabled = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) mutex_unlock(&smp2p->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) /* Initialize SMP2P interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static int ipa_smp2p_irq_init(struct ipa_smp2p *smp2p, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) irq_handler_t handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) struct device *dev = &smp2p->ipa->pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) unsigned int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) ret = platform_get_irq_byname(smp2p->ipa->pdev, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (ret <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) dev_err(dev, "DT error %d getting \"%s\" IRQ property\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) ret, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return ret ? : -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) irq = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) ret = request_threaded_irq(irq, NULL, handler, 0, name, smp2p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) dev_err(dev, "error %d requesting \"%s\" IRQ\n", ret, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static void ipa_smp2p_irq_exit(struct ipa_smp2p *smp2p, u32 irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) free_irq(irq, smp2p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /* Drop the clock reference if it was taken in ipa_smp2p_notify() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static void ipa_smp2p_clock_release(struct ipa *ipa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (!ipa->smp2p->clock_on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) ipa_clock_put(ipa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) ipa->smp2p->clock_on = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) /* Initialize the IPA SMP2P subsystem */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) int ipa_smp2p_init(struct ipa *ipa, bool modem_init)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) struct qcom_smem_state *enabled_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) struct device *dev = &ipa->pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) struct qcom_smem_state *valid_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) struct ipa_smp2p *smp2p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) u32 enabled_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) u32 valid_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) valid_state = qcom_smem_state_get(dev, "ipa-clock-enabled-valid",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) &valid_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (IS_ERR(valid_state))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) return PTR_ERR(valid_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (valid_bit >= 32) /* BITS_PER_U32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) enabled_state = qcom_smem_state_get(dev, "ipa-clock-enabled",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) &enabled_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (IS_ERR(enabled_state))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) return PTR_ERR(enabled_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (enabled_bit >= 32) /* BITS_PER_U32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) smp2p = kzalloc(sizeof(*smp2p), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (!smp2p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) smp2p->ipa = ipa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) /* These fields are needed by the clock query interrupt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * handler, so initialize them now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) mutex_init(&smp2p->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) smp2p->valid_state = valid_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) smp2p->valid_bit = valid_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) smp2p->enabled_state = enabled_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) smp2p->enabled_bit = enabled_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /* We have enough information saved to handle notifications */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) ipa->smp2p = smp2p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) ret = ipa_smp2p_irq_init(smp2p, "ipa-clock-query",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) ipa_smp2p_modem_clk_query_isr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) goto err_null_smp2p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) smp2p->clock_query_irq = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) ret = ipa_smp2p_panic_notifier_register(smp2p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) goto err_irq_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (modem_init) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) /* Result will be non-zero (negative for error) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) ret = ipa_smp2p_irq_init(smp2p, "ipa-setup-ready",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) ipa_smp2p_modem_setup_ready_isr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) goto err_notifier_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) smp2p->setup_ready_irq = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) err_notifier_unregister:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) ipa_smp2p_panic_notifier_unregister(smp2p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) err_irq_exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) ipa_smp2p_irq_exit(smp2p, smp2p->clock_query_irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) err_null_smp2p:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) ipa->smp2p = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) mutex_destroy(&smp2p->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) kfree(smp2p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) void ipa_smp2p_exit(struct ipa *ipa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) struct ipa_smp2p *smp2p = ipa->smp2p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (smp2p->setup_ready_irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) ipa_smp2p_irq_exit(smp2p, smp2p->setup_ready_irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) ipa_smp2p_panic_notifier_unregister(smp2p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) ipa_smp2p_irq_exit(smp2p, smp2p->clock_query_irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) /* We won't get notified any more; drop clock reference (if any) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) ipa_smp2p_clock_release(ipa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) ipa->smp2p = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) mutex_destroy(&smp2p->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) kfree(smp2p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) void ipa_smp2p_disable(struct ipa *ipa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) struct ipa_smp2p *smp2p = ipa->smp2p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (!smp2p->setup_ready_irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) mutex_lock(&smp2p->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) smp2p->disabled = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) mutex_unlock(&smp2p->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) /* Reset state tracking whether we have notified the modem */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) void ipa_smp2p_notify_reset(struct ipa *ipa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) struct ipa_smp2p *smp2p = ipa->smp2p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) u32 mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) if (!smp2p->notified)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) ipa_smp2p_clock_release(ipa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) /* Reset the clock enabled valid flag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) mask = BIT(smp2p->valid_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) qcom_smem_state_update_bits(smp2p->valid_state, mask, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) /* Mark the clock disabled for good measure... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) mask = BIT(smp2p->enabled_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) qcom_smem_state_update_bits(smp2p->enabled_state, mask, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) smp2p->notified = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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