![Alessandro Rubini](/assets/img/avatar_default.png)
This also introduces <asm/sta2x11.h> to export a function that is in the base sta2x11 support patches. The header will increase with other prototypes and constants over time. Signed-off-by: Alessandro Rubini <rubini@gnudd.com> Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@st.com> Cc: Alan Cox <alan@linux.intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
468 lines
12 KiB
C
468 lines
12 KiB
C
/*
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* Copyright (c) 2009-2011 Wind River Systems, Inc.
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* Copyright (c) 2011 ST Microelectronics (Alessandro Rubini)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/errno.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/pci.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/sta2x11-mfd.h>
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#include <asm/sta2x11.h>
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/* This describes STA2X11 MFD chip for us, we may have several */
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struct sta2x11_mfd {
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struct sta2x11_instance *instance;
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spinlock_t lock;
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struct list_head list;
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void __iomem *sctl_regs;
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void __iomem *apbreg_regs;
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};
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static LIST_HEAD(sta2x11_mfd_list);
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/* Three functions to act on the list */
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static struct sta2x11_mfd *sta2x11_mfd_find(struct pci_dev *pdev)
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{
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struct sta2x11_instance *instance;
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struct sta2x11_mfd *mfd;
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if (!pdev && !list_empty(&sta2x11_mfd_list)) {
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pr_warning("%s: Unspecified device, "
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"using first instance\n", __func__);
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return list_entry(sta2x11_mfd_list.next,
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struct sta2x11_mfd, list);
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}
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instance = sta2x11_get_instance(pdev);
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if (!instance)
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return NULL;
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list_for_each_entry(mfd, &sta2x11_mfd_list, list) {
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if (mfd->instance == instance)
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return mfd;
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}
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return NULL;
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}
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static int __devinit sta2x11_mfd_add(struct pci_dev *pdev, gfp_t flags)
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{
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struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
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struct sta2x11_instance *instance;
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if (mfd)
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return -EBUSY;
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instance = sta2x11_get_instance(pdev);
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if (!instance)
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return -EINVAL;
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mfd = kzalloc(sizeof(*mfd), flags);
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if (!mfd)
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return -ENOMEM;
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INIT_LIST_HEAD(&mfd->list);
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spin_lock_init(&mfd->lock);
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mfd->instance = instance;
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list_add(&mfd->list, &sta2x11_mfd_list);
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return 0;
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}
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static int __devexit mfd_remove(struct pci_dev *pdev)
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{
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struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
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if (!mfd)
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return -ENODEV;
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list_del(&mfd->list);
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kfree(mfd);
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return 0;
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}
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/* These two functions are exported and are not expected to fail */
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u32 sta2x11_sctl_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val)
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{
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struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
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u32 r;
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unsigned long flags;
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if (!mfd) {
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dev_warn(&pdev->dev, ": can't access sctl regs\n");
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return 0;
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}
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if (!mfd->sctl_regs) {
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dev_warn(&pdev->dev, ": system ctl not initialized\n");
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return 0;
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}
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spin_lock_irqsave(&mfd->lock, flags);
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r = readl(mfd->sctl_regs + reg);
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r &= ~mask;
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r |= val;
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if (mask)
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writel(r, mfd->sctl_regs + reg);
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spin_unlock_irqrestore(&mfd->lock, flags);
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return r;
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}
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EXPORT_SYMBOL(sta2x11_sctl_mask);
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u32 sta2x11_apbreg_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val)
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{
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struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
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u32 r;
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unsigned long flags;
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if (!mfd) {
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dev_warn(&pdev->dev, ": can't access apb regs\n");
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return 0;
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}
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if (!mfd->apbreg_regs) {
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dev_warn(&pdev->dev, ": apb bridge not initialized\n");
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return 0;
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}
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spin_lock_irqsave(&mfd->lock, flags);
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r = readl(mfd->apbreg_regs + reg);
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r &= ~mask;
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r |= val;
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if (mask)
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writel(r, mfd->apbreg_regs + reg);
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spin_unlock_irqrestore(&mfd->lock, flags);
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return r;
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}
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EXPORT_SYMBOL(sta2x11_apbreg_mask);
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/* Two debugfs files, for our registers (FIXME: one instance only) */
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#define REG(regname) {.name = #regname, .offset = SCTL_ ## regname}
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static struct debugfs_reg32 sta2x11_sctl_regs[] = {
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REG(SCCTL), REG(ARMCFG), REG(SCPLLCTL), REG(SCPLLFCTRL),
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REG(SCRESFRACT), REG(SCRESCTRL1), REG(SCRESXTRL2), REG(SCPEREN0),
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REG(SCPEREN1), REG(SCPEREN2), REG(SCGRST), REG(SCPCIPMCR1),
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REG(SCPCIPMCR2), REG(SCPCIPMSR1), REG(SCPCIPMSR2), REG(SCPCIPMSR3),
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REG(SCINTREN), REG(SCRISR), REG(SCCLKSTAT0), REG(SCCLKSTAT1),
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REG(SCCLKSTAT2), REG(SCRSTSTA),
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};
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#undef REG
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static struct debugfs_regset32 sctl_regset = {
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.regs = sta2x11_sctl_regs,
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.nregs = ARRAY_SIZE(sta2x11_sctl_regs),
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};
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#define REG(regname) {.name = #regname, .offset = regname}
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static struct debugfs_reg32 sta2x11_apbreg_regs[] = {
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REG(APBREG_BSR), REG(APBREG_PAER), REG(APBREG_PWAC), REG(APBREG_PRAC),
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REG(APBREG_PCG), REG(APBREG_PUR), REG(APBREG_EMU_PCG),
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};
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#undef REG
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static struct debugfs_regset32 apbreg_regset = {
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.regs = sta2x11_apbreg_regs,
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.nregs = ARRAY_SIZE(sta2x11_apbreg_regs),
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};
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static struct dentry *sta2x11_sctl_debugfs;
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static struct dentry *sta2x11_apbreg_debugfs;
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/* Probe for the two platform devices */
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static int sta2x11_sctl_probe(struct platform_device *dev)
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{
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struct pci_dev **pdev;
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struct sta2x11_mfd *mfd;
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struct resource *res;
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pdev = dev->dev.platform_data;
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mfd = sta2x11_mfd_find(*pdev);
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if (!mfd)
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return -ENODEV;
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res = platform_get_resource(dev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENOMEM;
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if (!request_mem_region(res->start, resource_size(res),
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"sta2x11-sctl"))
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return -EBUSY;
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mfd->sctl_regs = ioremap(res->start, resource_size(res));
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if (!mfd->sctl_regs) {
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release_mem_region(res->start, resource_size(res));
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return -ENOMEM;
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}
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sctl_regset.base = mfd->sctl_regs;
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sta2x11_sctl_debugfs = debugfs_create_regset32("sta2x11-sctl",
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S_IFREG | S_IRUGO,
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NULL, &sctl_regset);
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return 0;
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}
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static int sta2x11_apbreg_probe(struct platform_device *dev)
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{
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struct pci_dev **pdev;
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struct sta2x11_mfd *mfd;
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struct resource *res;
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pdev = dev->dev.platform_data;
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dev_dbg(&dev->dev, "%s: pdata is %p\n", __func__, pdev);
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dev_dbg(&dev->dev, "%s: *pdata is %p\n", __func__, *pdev);
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mfd = sta2x11_mfd_find(*pdev);
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if (!mfd)
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return -ENODEV;
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res = platform_get_resource(dev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENOMEM;
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if (!request_mem_region(res->start, resource_size(res),
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"sta2x11-apbreg"))
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return -EBUSY;
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mfd->apbreg_regs = ioremap(res->start, resource_size(res));
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if (!mfd->apbreg_regs) {
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release_mem_region(res->start, resource_size(res));
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return -ENOMEM;
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}
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dev_dbg(&dev->dev, "%s: regbase %p\n", __func__, mfd->apbreg_regs);
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apbreg_regset.base = mfd->apbreg_regs;
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sta2x11_apbreg_debugfs = debugfs_create_regset32("sta2x11-apbreg",
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S_IFREG | S_IRUGO,
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NULL, &apbreg_regset);
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return 0;
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}
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/* The two platform drivers */
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static struct platform_driver sta2x11_sctl_platform_driver = {
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.driver = {
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.name = "sta2x11-sctl",
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.owner = THIS_MODULE,
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},
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.probe = sta2x11_sctl_probe,
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};
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static int __init sta2x11_sctl_init(void)
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{
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pr_info("%s\n", __func__);
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return platform_driver_register(&sta2x11_sctl_platform_driver);
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}
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static struct platform_driver sta2x11_platform_driver = {
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.driver = {
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.name = "sta2x11-apbreg",
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.owner = THIS_MODULE,
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},
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.probe = sta2x11_apbreg_probe,
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};
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static int __init sta2x11_apbreg_init(void)
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{
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pr_info("%s\n", __func__);
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return platform_driver_register(&sta2x11_platform_driver);
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}
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/*
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* What follows is the PCI device that hosts the above two pdevs.
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* Each logic block is 4kB and they are all consecutive: we use this info.
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*/
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/* Bar 0 */
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enum bar0_cells {
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STA2X11_GPIO_0 = 0,
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STA2X11_GPIO_1,
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STA2X11_GPIO_2,
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STA2X11_GPIO_3,
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STA2X11_SCTL,
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STA2X11_SCR,
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STA2X11_TIME,
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};
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/* Bar 1 */
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enum bar1_cells {
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STA2X11_APBREG = 0,
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};
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#define CELL_4K(_name, _cell) { \
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.name = _name, \
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.start = _cell * 4096, .end = _cell * 4096 + 4095, \
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.flags = IORESOURCE_MEM, \
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}
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static const __devinitconst struct resource gpio_resources[] = {
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{
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.name = "sta2x11_gpio", /* 4 consecutive cells, 1 driver */
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.start = 0,
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.end = (4 * 4096) - 1,
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.flags = IORESOURCE_MEM,
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}
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};
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static const __devinitconst struct resource sctl_resources[] = {
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CELL_4K("sta2x11-sctl", STA2X11_SCTL),
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};
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static const __devinitconst struct resource scr_resources[] = {
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CELL_4K("sta2x11-scr", STA2X11_SCR),
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};
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static const __devinitconst struct resource time_resources[] = {
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CELL_4K("sta2x11-time", STA2X11_TIME),
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};
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static const __devinitconst struct resource apbreg_resources[] = {
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CELL_4K("sta2x11-apbreg", STA2X11_APBREG),
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};
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#define DEV(_name, _r) \
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{ .name = _name, .num_resources = ARRAY_SIZE(_r), .resources = _r, }
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static __devinitdata struct mfd_cell sta2x11_mfd_bar0[] = {
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DEV("sta2x11-gpio", gpio_resources), /* offset 0: we add pdata later */
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DEV("sta2x11-sctl", sctl_resources),
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DEV("sta2x11-scr", scr_resources),
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DEV("sta2x11-time", time_resources),
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};
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static __devinitdata struct mfd_cell sta2x11_mfd_bar1[] = {
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DEV("sta2x11-apbreg", apbreg_resources),
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};
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static int sta2x11_mfd_suspend(struct pci_dev *pdev, pm_message_t state)
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{
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pci_save_state(pdev);
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pci_disable_device(pdev);
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pci_set_power_state(pdev, pci_choose_state(pdev, state));
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return 0;
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}
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static int sta2x11_mfd_resume(struct pci_dev *pdev)
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{
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int err;
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pci_set_power_state(pdev, 0);
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err = pci_enable_device(pdev);
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if (err)
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return err;
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pci_restore_state(pdev);
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return 0;
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}
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static int __devinit sta2x11_mfd_probe(struct pci_dev *pdev,
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const struct pci_device_id *pci_id)
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{
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int err, i;
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struct sta2x11_gpio_pdata *gpio_data;
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dev_info(&pdev->dev, "%s\n", __func__);
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err = pci_enable_device(pdev);
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if (err) {
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dev_err(&pdev->dev, "Can't enable device.\n");
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return err;
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}
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err = pci_enable_msi(pdev);
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if (err)
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dev_info(&pdev->dev, "Enable msi failed\n");
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/* Read gpio config data as pci device's platform data */
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gpio_data = dev_get_platdata(&pdev->dev);
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if (!gpio_data)
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dev_warn(&pdev->dev, "no gpio configuration\n");
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dev_dbg(&pdev->dev, "%s, gpio_data = %p (%p)\n", __func__,
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gpio_data, &gpio_data);
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dev_dbg(&pdev->dev, "%s, pdev = %p (%p)\n", __func__,
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pdev, &pdev);
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/* platform data is the pci device for all of them */
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for (i = 0; i < ARRAY_SIZE(sta2x11_mfd_bar0); i++) {
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sta2x11_mfd_bar0[i].pdata_size = sizeof(pdev);
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sta2x11_mfd_bar0[i].platform_data = &pdev;
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}
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sta2x11_mfd_bar1[0].pdata_size = sizeof(pdev);
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sta2x11_mfd_bar1[0].platform_data = &pdev;
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/* Record this pdev before mfd_add_devices: their probe looks for it */
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sta2x11_mfd_add(pdev, GFP_ATOMIC);
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err = mfd_add_devices(&pdev->dev, -1,
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sta2x11_mfd_bar0,
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ARRAY_SIZE(sta2x11_mfd_bar0),
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&pdev->resource[0],
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0);
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if (err) {
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dev_err(&pdev->dev, "mfd_add_devices[0] failed: %d\n", err);
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goto err_disable;
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}
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err = mfd_add_devices(&pdev->dev, -1,
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sta2x11_mfd_bar1,
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ARRAY_SIZE(sta2x11_mfd_bar1),
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&pdev->resource[1],
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0);
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if (err) {
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dev_err(&pdev->dev, "mfd_add_devices[1] failed: %d\n", err);
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goto err_disable;
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}
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return 0;
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err_disable:
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mfd_remove_devices(&pdev->dev);
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pci_disable_device(pdev);
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pci_disable_msi(pdev);
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return err;
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}
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static DEFINE_PCI_DEVICE_TABLE(sta2x11_mfd_tbl) = {
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{PCI_DEVICE(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_GPIO)},
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{0,},
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};
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static struct pci_driver sta2x11_mfd_driver = {
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.name = "sta2x11-mfd",
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.id_table = sta2x11_mfd_tbl,
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.probe = sta2x11_mfd_probe,
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.suspend = sta2x11_mfd_suspend,
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.resume = sta2x11_mfd_resume,
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};
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static int __init sta2x11_mfd_init(void)
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{
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pr_info("%s\n", __func__);
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return pci_register_driver(&sta2x11_mfd_driver);
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}
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/*
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* All of this must be ready before "normal" devices like MMCI appear.
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* But MFD (the pci device) can't be too early. The following choice
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* prepares platform drivers very early and probe the PCI device later,
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* but before other PCI devices.
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*/
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subsys_initcall(sta2x11_apbreg_init);
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subsys_initcall(sta2x11_sctl_init);
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rootfs_initcall(sta2x11_mfd_init);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Wind River");
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MODULE_DESCRIPTION("STA2x11 mfd for GPIO, SCTL and APBREG");
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MODULE_DEVICE_TABLE(pci, sta2x11_mfd_tbl);
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