| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Dave Gerlach | 2052 | 94.69% | 2 | 40.00% |
| J Keerthy | 105 | 4.85% | 1 | 20.00% |
| Wei Yongjun | 7 | 0.32% | 1 | 20.00% |
| Arnd Bergmann | 3 | 0.14% | 1 | 20.00% |
| Total | 2167 | 5 |
/* * AMx3 Wkup M3 IPC driver * * Copyright (C) 2015 Texas Instruments, Inc. * * Dave Gerlach <d-gerlach@ti.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/err.h> #include <linux/kernel.h> #include <linux/kthread.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/module.h> #include <linux/of.h> #include <linux/omap-mailbox.h> #include <linux/platform_device.h> #include <linux/remoteproc.h> #include <linux/suspend.h> #include <linux/wkup_m3_ipc.h> #define AM33XX_CTRL_IPC_REG_COUNT 0x8 #define AM33XX_CTRL_IPC_REG_OFFSET(m) (0x4 + 4 * (m)) /* AM33XX M3_TXEV_EOI register */ #define AM33XX_CONTROL_M3_TXEV_EOI 0x00 #define AM33XX_M3_TXEV_ACK (0x1 << 0) #define AM33XX_M3_TXEV_ENABLE (0x0 << 0) #define IPC_CMD_DS0 0x4 #define IPC_CMD_STANDBY 0xc #define IPC_CMD_IDLE 0x10 #define IPC_CMD_RESET 0xe #define DS_IPC_DEFAULT 0xffffffff #define M3_VERSION_UNKNOWN 0x0000ffff #define M3_BASELINE_VERSION 0x191 #define M3_STATUS_RESP_MASK (0xffff << 16) #define M3_FW_VERSION_MASK 0xffff #define M3_WAKE_SRC_MASK 0xff #define M3_STATE_UNKNOWN 0 #define M3_STATE_RESET 1 #define M3_STATE_INITED 2 #define M3_STATE_MSG_FOR_LP 3 #define M3_STATE_MSG_FOR_RESET 4 static struct wkup_m3_ipc *m3_ipc_state; static const struct wkup_m3_wakeup_src wakeups[] = { {.irq_nr = 35, .src = "USB0_PHY"}, {.irq_nr = 36, .src = "USB1_PHY"}, {.irq_nr = 40, .src = "I2C0"}, {.irq_nr = 41, .src = "RTC Timer"}, {.irq_nr = 42, .src = "RTC Alarm"}, {.irq_nr = 43, .src = "Timer0"}, {.irq_nr = 44, .src = "Timer1"}, {.irq_nr = 45, .src = "UART"}, {.irq_nr = 46, .src = "GPIO0"}, {.irq_nr = 48, .src = "MPU_WAKE"}, {.irq_nr = 49, .src = "WDT0"}, {.irq_nr = 50, .src = "WDT1"}, {.irq_nr = 51, .src = "ADC_TSC"}, {.irq_nr = 0, .src = "Unknown"}, }; static void am33xx_txev_eoi(struct wkup_m3_ipc *m3_ipc) { writel(AM33XX_M3_TXEV_ACK, m3_ipc->ipc_mem_base + AM33XX_CONTROL_M3_TXEV_EOI); } static void am33xx_txev_enable(struct wkup_m3_ipc *m3_ipc) { writel(AM33XX_M3_TXEV_ENABLE, m3_ipc->ipc_mem_base + AM33XX_CONTROL_M3_TXEV_EOI); } static void wkup_m3_ctrl_ipc_write(struct wkup_m3_ipc *m3_ipc, u32 val, int ipc_reg_num) { if (WARN(ipc_reg_num < 0 || ipc_reg_num > AM33XX_CTRL_IPC_REG_COUNT, "ipc register operation out of range")) return; writel(val, m3_ipc->ipc_mem_base + AM33XX_CTRL_IPC_REG_OFFSET(ipc_reg_num)); } static unsigned int wkup_m3_ctrl_ipc_read(struct wkup_m3_ipc *m3_ipc, int ipc_reg_num) { if (WARN(ipc_reg_num < 0 || ipc_reg_num > AM33XX_CTRL_IPC_REG_COUNT, "ipc register operation out of range")) return 0; return readl(m3_ipc->ipc_mem_base + AM33XX_CTRL_IPC_REG_OFFSET(ipc_reg_num)); } static int wkup_m3_fw_version_read(struct wkup_m3_ipc *m3_ipc) { int val; val = wkup_m3_ctrl_ipc_read(m3_ipc, 2); return val & M3_FW_VERSION_MASK; } static irqreturn_t wkup_m3_txev_handler(int irq, void *ipc_data) { struct wkup_m3_ipc *m3_ipc = ipc_data; struct device *dev = m3_ipc->dev; int ver = 0; am33xx_txev_eoi(m3_ipc); switch (m3_ipc->state) { case M3_STATE_RESET: ver = wkup_m3_fw_version_read(m3_ipc); if (ver == M3_VERSION_UNKNOWN || ver < M3_BASELINE_VERSION) { dev_warn(dev, "CM3 Firmware Version %x not supported\n", ver); } else { dev_info(dev, "CM3 Firmware Version = 0x%x\n", ver); } m3_ipc->state = M3_STATE_INITED; complete(&m3_ipc->sync_complete); break; case M3_STATE_MSG_FOR_RESET: m3_ipc->state = M3_STATE_INITED; complete(&m3_ipc->sync_complete); break; case M3_STATE_MSG_FOR_LP: complete(&m3_ipc->sync_complete); break; case M3_STATE_UNKNOWN: dev_warn(dev, "Unknown CM3 State\n"); } am33xx_txev_enable(m3_ipc); return IRQ_HANDLED; } static int wkup_m3_ping(struct wkup_m3_ipc *m3_ipc) { struct device *dev = m3_ipc->dev; mbox_msg_t dummy_msg = 0; int ret; if (!m3_ipc->mbox) { dev_err(dev, "No IPC channel to communicate with wkup_m3!\n"); return -EIO; } /* * Write a dummy message to the mailbox in order to trigger the RX * interrupt to alert the M3 that data is available in the IPC * registers. We must enable the IRQ here and disable it after in * the RX callback to avoid multiple interrupts being received * by the CM3. */ ret = mbox_send_message(m3_ipc->mbox, &dummy_msg); if (ret < 0) { dev_err(dev, "%s: mbox_send_message() failed: %d\n", __func__, ret); return ret; } ret = wait_for_completion_timeout(&m3_ipc->sync_complete, msecs_to_jiffies(500)); if (!ret) { dev_err(dev, "MPU<->CM3 sync failure\n"); m3_ipc->state = M3_STATE_UNKNOWN; return -EIO; } mbox_client_txdone(m3_ipc->mbox, 0); return 0; } static int wkup_m3_ping_noirq(struct wkup_m3_ipc *m3_ipc) { struct device *dev = m3_ipc->dev; mbox_msg_t dummy_msg = 0; int ret; if (!m3_ipc->mbox) { dev_err(dev, "No IPC channel to communicate with wkup_m3!\n"); return -EIO; } ret = mbox_send_message(m3_ipc->mbox, &dummy_msg); if (ret < 0) { dev_err(dev, "%s: mbox_send_message() failed: %d\n", __func__, ret); return ret; } mbox_client_txdone(m3_ipc->mbox, 0); return 0; } static int wkup_m3_is_available(struct wkup_m3_ipc *m3_ipc) { return ((m3_ipc->state != M3_STATE_RESET) && (m3_ipc->state != M3_STATE_UNKNOWN)); } /* Public functions */ /** * wkup_m3_set_mem_type - Pass wkup_m3 which type of memory is in use * @mem_type: memory type value read directly from emif * * wkup_m3 must know what memory type is in use to properly suspend * and resume. */ static void wkup_m3_set_mem_type(struct wkup_m3_ipc *m3_ipc, int mem_type) { m3_ipc->mem_type = mem_type; } /** * wkup_m3_set_resume_address - Pass wkup_m3 resume address * @addr: Physical address from which resume code should execute */ static void wkup_m3_set_resume_address(struct wkup_m3_ipc *m3_ipc, void *addr) { m3_ipc->resume_addr = (unsigned long)addr; } /** * wkup_m3_request_pm_status - Retrieve wkup_m3 status code after suspend * * Returns code representing the status of a low power mode transition. * 0 - Successful transition * 1 - Failure to transition to low power state */ static int wkup_m3_request_pm_status(struct wkup_m3_ipc *m3_ipc) { unsigned int i; int val; val = wkup_m3_ctrl_ipc_read(m3_ipc, 1); i = M3_STATUS_RESP_MASK & val; i >>= __ffs(M3_STATUS_RESP_MASK); return i; } /** * wkup_m3_prepare_low_power - Request preparation for transition to * low power state * @state: A kernel suspend state to enter, either MEM or STANDBY * * Returns 0 if preparation was successful, otherwise returns error code */ static int wkup_m3_prepare_low_power(struct wkup_m3_ipc *m3_ipc, int state) { struct device *dev = m3_ipc->dev; int m3_power_state; int ret = 0; if (!wkup_m3_is_available(m3_ipc)) return -ENODEV; switch (state) { case WKUP_M3_DEEPSLEEP: m3_power_state = IPC_CMD_DS0; break; case WKUP_M3_STANDBY: m3_power_state = IPC_CMD_STANDBY; break; case WKUP_M3_IDLE: m3_power_state = IPC_CMD_IDLE; break; default: return 1; } /* Program each required IPC register then write defaults to others */ wkup_m3_ctrl_ipc_write(m3_ipc, m3_ipc->resume_addr, 0); wkup_m3_ctrl_ipc_write(m3_ipc, m3_power_state, 1); wkup_m3_ctrl_ipc_write(m3_ipc, m3_ipc->mem_type, 4); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 2); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 3); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 5); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 6); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 7); m3_ipc->state = M3_STATE_MSG_FOR_LP; if (state == WKUP_M3_IDLE) ret = wkup_m3_ping_noirq(m3_ipc); else ret = wkup_m3_ping(m3_ipc); if (ret) { dev_err(dev, "Unable to ping CM3\n"); return ret; } return 0; } /** * wkup_m3_finish_low_power - Return m3 to reset state * * Returns 0 if reset was successful, otherwise returns error code */ static int wkup_m3_finish_low_power(struct wkup_m3_ipc *m3_ipc) { struct device *dev = m3_ipc->dev; int ret = 0; if (!wkup_m3_is_available(m3_ipc)) return -ENODEV; wkup_m3_ctrl_ipc_write(m3_ipc, IPC_CMD_RESET, 1); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 2); m3_ipc->state = M3_STATE_MSG_FOR_RESET; ret = wkup_m3_ping(m3_ipc); if (ret) { dev_err(dev, "Unable to ping CM3\n"); return ret; } return 0; } /** * wkup_m3_request_wake_src - Get the wakeup source info passed from wkup_m3 * @m3_ipc: Pointer to wkup_m3_ipc context */ static const char *wkup_m3_request_wake_src(struct wkup_m3_ipc *m3_ipc) { unsigned int wakeup_src_idx; int j, val; val = wkup_m3_ctrl_ipc_read(m3_ipc, 6); wakeup_src_idx = val & M3_WAKE_SRC_MASK; for (j = 0; j < ARRAY_SIZE(wakeups) - 1; j++) { if (wakeups[j].irq_nr == wakeup_src_idx) return wakeups[j].src; } return wakeups[j].src; } /** * wkup_m3_set_rtc_only - Set the rtc_only flag * @wkup_m3_wakeup: struct wkup_m3_wakeup_src * gets assigned the * wakeup src value */ static void wkup_m3_set_rtc_only(struct wkup_m3_ipc *m3_ipc) { if (m3_ipc_state) m3_ipc_state->is_rtc_only = true; } static struct wkup_m3_ipc_ops ipc_ops = { .set_mem_type = wkup_m3_set_mem_type, .set_resume_address = wkup_m3_set_resume_address, .prepare_low_power = wkup_m3_prepare_low_power, .finish_low_power = wkup_m3_finish_low_power, .request_pm_status = wkup_m3_request_pm_status, .request_wake_src = wkup_m3_request_wake_src, .set_rtc_only = wkup_m3_set_rtc_only, }; /** * wkup_m3_ipc_get - Return handle to wkup_m3_ipc * * Returns NULL if the wkup_m3 is not yet available, otherwise returns * pointer to wkup_m3_ipc struct. */ struct wkup_m3_ipc *wkup_m3_ipc_get(void) { if (m3_ipc_state) get_device(m3_ipc_state->dev); else return NULL; return m3_ipc_state; } EXPORT_SYMBOL_GPL(wkup_m3_ipc_get); /** * wkup_m3_ipc_put - Free handle to wkup_m3_ipc returned from wkup_m3_ipc_get * @m3_ipc: A pointer to wkup_m3_ipc struct returned by wkup_m3_ipc_get */ void wkup_m3_ipc_put(struct wkup_m3_ipc *m3_ipc) { if (m3_ipc_state) put_device(m3_ipc_state->dev); } EXPORT_SYMBOL_GPL(wkup_m3_ipc_put); static void wkup_m3_rproc_boot_thread(struct wkup_m3_ipc *m3_ipc) { struct device *dev = m3_ipc->dev; int ret; init_completion(&m3_ipc->sync_complete); ret = rproc_boot(m3_ipc->rproc); if (ret) dev_err(dev, "rproc_boot failed\n"); do_exit(0); } static int wkup_m3_ipc_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; int irq, ret; phandle rproc_phandle; struct rproc *m3_rproc; struct resource *res; struct task_struct *task; struct wkup_m3_ipc *m3_ipc; m3_ipc = devm_kzalloc(dev, sizeof(*m3_ipc), GFP_KERNEL); if (!m3_ipc) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); m3_ipc->ipc_mem_base = devm_ioremap_resource(dev, res); if (IS_ERR(m3_ipc->ipc_mem_base)) { dev_err(dev, "could not ioremap ipc_mem\n"); return PTR_ERR(m3_ipc->ipc_mem_base); } irq = platform_get_irq(pdev, 0); if (!irq) { dev_err(&pdev->dev, "no irq resource\n"); return -ENXIO; } ret = devm_request_irq(dev, irq, wkup_m3_txev_handler, 0, "wkup_m3_txev", m3_ipc); if (ret) { dev_err(dev, "request_irq failed\n"); return ret; } m3_ipc->mbox_client.dev = dev; m3_ipc->mbox_client.tx_done = NULL; m3_ipc->mbox_client.tx_prepare = NULL; m3_ipc->mbox_client.rx_callback = NULL; m3_ipc->mbox_client.tx_block = false; m3_ipc->mbox_client.knows_txdone = false; m3_ipc->mbox = mbox_request_channel(&m3_ipc->mbox_client, 0); if (IS_ERR(m3_ipc->mbox)) { dev_err(dev, "IPC Request for A8->M3 Channel failed! %ld\n", PTR_ERR(m3_ipc->mbox)); return PTR_ERR(m3_ipc->mbox); } if (of_property_read_u32(dev->of_node, "ti,rproc", &rproc_phandle)) { dev_err(&pdev->dev, "could not get rproc phandle\n"); ret = -ENODEV; goto err_free_mbox; } m3_rproc = rproc_get_by_phandle(rproc_phandle); if (!m3_rproc) { dev_err(&pdev->dev, "could not get rproc handle\n"); ret = -EPROBE_DEFER; goto err_free_mbox; } m3_ipc->rproc = m3_rproc; m3_ipc->dev = dev; m3_ipc->state = M3_STATE_RESET; m3_ipc->ops = &ipc_ops; /* * Wait for firmware loading completion in a thread so we * can boot the wkup_m3 as soon as it's ready without holding * up kernel boot */ task = kthread_run((void *)wkup_m3_rproc_boot_thread, m3_ipc, "wkup_m3_rproc_loader"); if (IS_ERR(task)) { dev_err(dev, "can't create rproc_boot thread\n"); ret = PTR_ERR(task); goto err_put_rproc; } m3_ipc_state = m3_ipc; return 0; err_put_rproc: rproc_put(m3_rproc); err_free_mbox: mbox_free_channel(m3_ipc->mbox); return ret; } static int wkup_m3_ipc_remove(struct platform_device *pdev) { mbox_free_channel(m3_ipc_state->mbox); rproc_shutdown(m3_ipc_state->rproc); rproc_put(m3_ipc_state->rproc); m3_ipc_state = NULL; return 0; } static int __maybe_unused wkup_m3_ipc_suspend(struct device *dev) { /* * Nothing needs to be done on suspend even with rtc_only flag set */ return 0; } static int __maybe_unused wkup_m3_ipc_resume(struct device *dev) { if (m3_ipc_state->is_rtc_only) { rproc_shutdown(m3_ipc_state->rproc); rproc_boot(m3_ipc_state->rproc); } m3_ipc_state->is_rtc_only = false; return 0; } static const struct dev_pm_ops wkup_m3_ipc_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(wkup_m3_ipc_suspend, wkup_m3_ipc_resume) }; static const struct of_device_id wkup_m3_ipc_of_match[] = { { .compatible = "ti,am3352-wkup-m3-ipc", }, { .compatible = "ti,am4372-wkup-m3-ipc", }, {}, }; MODULE_DEVICE_TABLE(of, wkup_m3_ipc_of_match); static struct platform_driver wkup_m3_ipc_driver = { .probe = wkup_m3_ipc_probe, .remove = wkup_m3_ipc_remove, .driver = { .name = "wkup_m3_ipc", .of_match_table = wkup_m3_ipc_of_match, .pm = &wkup_m3_ipc_pm_ops, }, }; module_platform_driver(wkup_m3_ipc_driver); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("wkup m3 remote processor ipc driver"); MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
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