diff options
Diffstat (limited to 'drivers/hsi/controllers/omap_ssi.c')
| -rw-r--r-- | drivers/hsi/controllers/omap_ssi.c | 610 |
1 files changed, 0 insertions, 610 deletions
diff --git a/drivers/hsi/controllers/omap_ssi.c b/drivers/hsi/controllers/omap_ssi.c deleted file mode 100644 index 27b91f14b..000000000 --- a/drivers/hsi/controllers/omap_ssi.c +++ /dev/null @@ -1,610 +0,0 @@ -/* 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; - void __iomem *base; - struct hsi_controller *ssi = platform_get_drvdata(pd); - - mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); - base = devm_ioremap_resource(&ssi->device, mem); - if (IS_ERR(base)) - return PTR_ERR(base); - - *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; - } - - err = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL); - if (err < 0) - goto out_err; - ssi->id = 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 -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", - .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"); |