/* OMAP SSI driver. * * Copyright (C) 2010 Nokia Corporation. All rights reserved. * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org> * * Contact: Carlos Chinea <carlos.chinea@nokia.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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA */ #include <linux/compiler.h> #include <linux/err.h> #include <linux/ioport.h> #include <linux/io.h> #include <linux/gpio.h> #include <linux/clk.h> #include <linux/device.h> #include <linux/platform_device.h> #include <linux/dma-mapping.h> #include <linux/dmaengine.h> #include <linux/delay.h> #include <linux/seq_file.h> #include <linux/scatterlist.h> #include <linux/interrupt.h> #include <linux/spinlock.h> #include <linux/debugfs.h> #include <linux/pm_runtime.h> #include <linux/of_platform.h> #include <linux/hsi/hsi.h> #include <linux/idr.h> #include "omap_ssi_regs.h" #include "omap_ssi.h" /* For automatically allocated device IDs */ static DEFINE_IDA(platform_omap_ssi_ida); #ifdef CONFIG_DEBUG_FS static int ssi_debug_show(struct seq_file *m, void *p __maybe_unused) { struct hsi_controller *ssi = m->private; struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); void __iomem *sys = omap_ssi->sys; pm_runtime_get_sync(ssi->device.parent); seq_printf(m, "REVISION\t: 0x%08x\n", readl(sys + SSI_REVISION_REG)); seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG)); seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG)); pm_runtime_put_sync(ssi->device.parent); return 0; } static int ssi_debug_gdd_show(struct seq_file *m, void *p __maybe_unused) { struct hsi_controller *ssi = m->private; struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); void __iomem *gdd = omap_ssi->gdd; void __iomem *sys = omap_ssi->sys; int lch; pm_runtime_get_sync(ssi->device.parent); seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n", readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG)); seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n", readl(sys + SSI_GDD_MPU_IRQ_ENABLE_REG)); seq_printf(m, "HW_ID\t\t: 0x%08x\n", readl(gdd + SSI_GDD_HW_ID_REG)); seq_printf(m, "PPORT_ID\t: 0x%08x\n", readl(gdd + SSI_GDD_PPORT_ID_REG)); seq_printf(m, "MPORT_ID\t: 0x%08x\n", readl(gdd + SSI_GDD_MPORT_ID_REG)); seq_printf(m, "TEST\t\t: 0x%08x\n", readl(gdd + SSI_GDD_TEST_REG)); seq_printf(m, "GCR\t\t: 0x%08x\n", readl(gdd + SSI_GDD_GCR_REG)); for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { seq_printf(m, "\nGDD LCH %d\n=========\n", lch); seq_printf(m, "CSDP\t\t: 0x%04x\n", readw(gdd + SSI_GDD_CSDP_REG(lch))); seq_printf(m, "CCR\t\t: 0x%04x\n", readw(gdd + SSI_GDD_CCR_REG(lch))); seq_printf(m, "CICR\t\t: 0x%04x\n", readw(gdd + SSI_GDD_CICR_REG(lch))); seq_printf(m, "CSR\t\t: 0x%04x\n", readw(gdd + SSI_GDD_CSR_REG(lch))); seq_printf(m, "CSSA\t\t: 0x%08x\n", readl(gdd + SSI_GDD_CSSA_REG(lch))); seq_printf(m, "CDSA\t\t: 0x%08x\n", readl(gdd + SSI_GDD_CDSA_REG(lch))); seq_printf(m, "CEN\t\t: 0x%04x\n", readw(gdd + SSI_GDD_CEN_REG(lch))); seq_printf(m, "CSAC\t\t: 0x%04x\n", readw(gdd + SSI_GDD_CSAC_REG(lch))); seq_printf(m, "CDAC\t\t: 0x%04x\n", readw(gdd + SSI_GDD_CDAC_REG(lch))); seq_printf(m, "CLNK_CTRL\t: 0x%04x\n", readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch))); } pm_runtime_put_sync(ssi->device.parent); return 0; } static int ssi_regs_open(struct inode *inode, struct file *file) { return single_open(file, ssi_debug_show, inode->i_private); } static int ssi_gdd_regs_open(struct inode *inode, struct file *file) { return single_open(file, ssi_debug_gdd_show, inode->i_private); } static const struct file_operations ssi_regs_fops = { .open = ssi_regs_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static const struct file_operations ssi_gdd_regs_fops = { .open = ssi_gdd_regs_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int __init ssi_debug_add_ctrl(struct hsi_controller *ssi) { struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); struct dentry *dir; /* SSI controller */ omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL); if (!omap_ssi->dir) return -ENOMEM; debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi, &ssi_regs_fops); /* SSI GDD (DMA) */ dir = debugfs_create_dir("gdd", omap_ssi->dir); if (!dir) goto rback; debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops); return 0; rback: debugfs_remove_recursive(omap_ssi->dir); return -ENOMEM; } static void ssi_debug_remove_ctrl(struct hsi_controller *ssi) { struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); debugfs_remove_recursive(omap_ssi->dir); } #endif /* CONFIG_DEBUG_FS */ /* * FIXME: Horrible HACK needed until we remove the useless wakeline test * in the CMT. To be removed !!!! */ void ssi_waketest(struct hsi_client *cl, unsigned int enable) { struct hsi_port *port = hsi_get_port(cl); struct omap_ssi_port *omap_port = hsi_port_drvdata(port); struct hsi_controller *ssi = to_hsi_controller(port->device.parent); struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); omap_port->wktest = !!enable; if (omap_port->wktest) { pm_runtime_get_sync(ssi->device.parent); writel_relaxed(SSI_WAKE(0), omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); } else { writel_relaxed(SSI_WAKE(0), omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); pm_runtime_put_sync(ssi->device.parent); } } EXPORT_SYMBOL_GPL(ssi_waketest); static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch) { struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg; struct hsi_port *port = to_hsi_port(msg->cl->device.parent); struct omap_ssi_port *omap_port = hsi_port_drvdata(port); unsigned int dir; u32 csr; u32 val; spin_lock(&omap_ssi->lock); val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); val &= ~SSI_GDD_LCH(lch); writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); if (msg->ttype == HSI_MSG_READ) { dir = DMA_FROM_DEVICE; val = SSI_DATAAVAILABLE(msg->channel); pm_runtime_put_sync(ssi->device.parent); } else { dir = DMA_TO_DEVICE; val = SSI_DATAACCEPT(msg->channel); /* Keep clocks reference for write pio event */ } dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir); csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch)); omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */ dev_dbg(&port->device, "DMA completed ch %d ttype %d\n", msg->channel, msg->ttype); spin_unlock(&omap_ssi->lock); if (csr & SSI_CSR_TOUR) { /* Timeout error */ msg->status = HSI_STATUS_ERROR; msg->actual_len = 0; spin_lock(&omap_port->lock); list_del(&msg->link); /* Dequeue msg */ spin_unlock(&omap_port->lock); msg->complete(msg); return; } spin_lock(&omap_port->lock); val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); spin_unlock(&omap_port->lock); msg->status = HSI_STATUS_COMPLETED; msg->actual_len = sg_dma_len(msg->sgt.sgl); } static void ssi_gdd_tasklet(unsigned long dev) { struct hsi_controller *ssi = (struct hsi_controller *)dev; struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); void __iomem *sys = omap_ssi->sys; unsigned int lch; u32 status_reg; pm_runtime_get_sync(ssi->device.parent); status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { if (status_reg & SSI_GDD_LCH(lch)) ssi_gdd_complete(ssi, lch); } writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG); status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); pm_runtime_put_sync(ssi->device.parent); if (status_reg) tasklet_hi_schedule(&omap_ssi->gdd_tasklet); else enable_irq(omap_ssi->gdd_irq); } static irqreturn_t ssi_gdd_isr(int irq, void *ssi) { struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); tasklet_hi_schedule(&omap_ssi->gdd_tasklet); disable_irq_nosync(irq); return IRQ_HANDLED; } static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi) { struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); unsigned long rate = clk_get_rate(omap_ssi->fck); return rate; } static int __init ssi_get_iomem(struct platform_device *pd, const char *name, void __iomem **pbase, dma_addr_t *phy) { struct resource *mem; struct resource *ioarea; void __iomem *base; struct hsi_controller *ssi = platform_get_drvdata(pd); mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); if (!mem) { dev_err(&pd->dev, "IO memory region missing (%s)\n", name); return -ENXIO; } ioarea = devm_request_mem_region(&ssi->device, mem->start, resource_size(mem), dev_name(&pd->dev)); if (!ioarea) { dev_err(&pd->dev, "%s IO memory region request failed\n", mem->name); return -ENXIO; } base = devm_ioremap(&ssi->device, mem->start, resource_size(mem)); if (!base) { dev_err(&pd->dev, "%s IO remap failed\n", mem->name); return -ENXIO; } *pbase = base; if (phy) *phy = mem->start; return 0; } static int __init ssi_add_controller(struct hsi_controller *ssi, struct platform_device *pd) { struct omap_ssi_controller *omap_ssi; int err; omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL); if (!omap_ssi) { dev_err(&pd->dev, "not enough memory for omap ssi\n"); return -ENOMEM; } ssi->id = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL); if (ssi->id < 0) { err = ssi->id; goto out_err; } ssi->owner = THIS_MODULE; ssi->device.parent = &pd->dev; dev_set_name(&ssi->device, "ssi%d", ssi->id); hsi_controller_set_drvdata(ssi, omap_ssi); omap_ssi->dev = &ssi->device; err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL); if (err < 0) goto out_err; err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL); if (err < 0) goto out_err; err = platform_get_irq_byname(pd, "gdd_mpu"); if (err < 0) { dev_err(&pd->dev, "GDD IRQ resource missing\n"); goto out_err; } omap_ssi->gdd_irq = err; tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet, (unsigned long)ssi); err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr, 0, "gdd_mpu", ssi); if (err < 0) { dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)", omap_ssi->gdd_irq, err); goto out_err; } omap_ssi->port = devm_kzalloc(&ssi->device, sizeof(struct omap_ssi_port *) * ssi->num_ports, GFP_KERNEL); if (!omap_ssi->port) { err = -ENOMEM; goto out_err; } omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck"); if (IS_ERR(omap_ssi->fck)) { dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n", PTR_ERR(omap_ssi->fck)); err = -ENODEV; goto out_err; } /* TODO: find register, which can be used to detect context loss */ omap_ssi->get_loss = NULL; omap_ssi->max_speed = UINT_MAX; spin_lock_init(&omap_ssi->lock); err = hsi_register_controller(ssi); if (err < 0) goto out_err; return 0; out_err: ida_simple_remove(&platform_omap_ssi_ida, ssi->id); return err; } static int __init ssi_hw_init(struct hsi_controller *ssi) { struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); unsigned int i; u32 val; int err; err = pm_runtime_get_sync(ssi->device.parent); if (err < 0) { dev_err(&ssi->device, "runtime PM failed %d\n", err); return err; } /* Reseting SSI controller */ writel_relaxed(SSI_SOFTRESET, omap_ssi->sys + SSI_SYSCONFIG_REG); val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG); for (i = 0; ((i < 20) && !(val & SSI_RESETDONE)); i++) { msleep(20); val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG); } if (!(val & SSI_RESETDONE)) { dev_err(&ssi->device, "SSI HW reset failed\n"); pm_runtime_put_sync(ssi->device.parent); return -EIO; } /* Reseting GDD */ writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); /* Get FCK rate in KHz */ omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); dev_dbg(&ssi->device, "SSI fck rate %lu KHz\n", omap_ssi->fck_rate); /* Set default PM settings */ val = SSI_AUTOIDLE | SSI_SIDLEMODE_SMART | SSI_MIDLEMODE_SMART; writel_relaxed(val, omap_ssi->sys + SSI_SYSCONFIG_REG); omap_ssi->sysconfig = val; writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; pm_runtime_put_sync(ssi->device.parent); return 0; } static void ssi_remove_controller(struct hsi_controller *ssi) { struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); int id = ssi->id; tasklet_kill(&omap_ssi->gdd_tasklet); hsi_unregister_controller(ssi); ida_simple_remove(&platform_omap_ssi_ida, id); } static inline int ssi_of_get_available_ports_count(const struct device_node *np) { struct device_node *child; int num = 0; for_each_available_child_of_node(np, child) if (of_device_is_compatible(child, "ti,omap3-ssi-port")) num++; return num; } static int ssi_remove_ports(struct device *dev, void *c) { struct platform_device *pdev = to_platform_device(dev); of_device_unregister(pdev); return 0; } static int __init ssi_probe(struct platform_device *pd) { struct platform_device *childpdev; struct device_node *np = pd->dev.of_node; struct device_node *child; struct hsi_controller *ssi; int err; int num_ports; if (!np) { dev_err(&pd->dev, "missing device tree data\n"); return -EINVAL; } num_ports = ssi_of_get_available_ports_count(np); ssi = hsi_alloc_controller(num_ports, GFP_KERNEL); if (!ssi) { dev_err(&pd->dev, "No memory for controller\n"); return -ENOMEM; } platform_set_drvdata(pd, ssi); err = ssi_add_controller(ssi, pd); if (err < 0) goto out1; pm_runtime_irq_safe(&pd->dev); pm_runtime_enable(&pd->dev); err = ssi_hw_init(ssi); if (err < 0) goto out2; #ifdef CONFIG_DEBUG_FS err = ssi_debug_add_ctrl(ssi); if (err < 0) goto out2; #endif for_each_available_child_of_node(np, child) { if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) continue; childpdev = of_platform_device_create(child, NULL, &pd->dev); if (!childpdev) { err = -ENODEV; dev_err(&pd->dev, "failed to create ssi controller port\n"); goto out3; } } dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", ssi->id, num_ports); return err; out3: device_for_each_child(&pd->dev, NULL, ssi_remove_ports); out2: ssi_remove_controller(ssi); out1: platform_set_drvdata(pd, NULL); pm_runtime_disable(&pd->dev); return err; } static int __exit ssi_remove(struct platform_device *pd) { struct hsi_controller *ssi = platform_get_drvdata(pd); #ifdef CONFIG_DEBUG_FS ssi_debug_remove_ctrl(ssi); #endif ssi_remove_controller(ssi); platform_set_drvdata(pd, NULL); pm_runtime_disable(&pd->dev); /* cleanup of of_platform_populate() call */ device_for_each_child(&pd->dev, NULL, ssi_remove_ports); return 0; } #ifdef CONFIG_PM_RUNTIME static int omap_ssi_runtime_suspend(struct device *dev) { struct hsi_controller *ssi = dev_get_drvdata(dev); struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); dev_dbg(dev, "runtime suspend!\n"); if (omap_ssi->get_loss) omap_ssi->loss_count = omap_ssi->get_loss(ssi->device.parent); return 0; } static int omap_ssi_runtime_resume(struct device *dev) { struct hsi_controller *ssi = dev_get_drvdata(dev); struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); dev_dbg(dev, "runtime resume!\n"); if ((omap_ssi->get_loss) && (omap_ssi->loss_count == omap_ssi->get_loss(ssi->device.parent))) return 0; writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); return 0; } static const struct dev_pm_ops omap_ssi_pm_ops = { SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, NULL) }; #define DEV_PM_OPS (&omap_ssi_pm_ops) #else #define DEV_PM_OPS NULL #endif #ifdef CONFIG_OF static const struct of_device_id omap_ssi_of_match[] = { { .compatible = "ti,omap3-ssi", }, {}, }; MODULE_DEVICE_TABLE(of, omap_ssi_of_match); #else #define omap_ssi_of_match NULL #endif static struct platform_driver ssi_pdriver = { .remove = __exit_p(ssi_remove), .driver = { .name = "omap_ssi", .owner = THIS_MODULE, .pm = DEV_PM_OPS, .of_match_table = omap_ssi_of_match, }, }; module_platform_driver_probe(ssi_pdriver, ssi_probe); MODULE_ALIAS("platform:omap_ssi"); MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); MODULE_LICENSE("GPL v2");