msm: Platform initialization for the IOMMU driver
Register a driver for the MSM IOMMU devices and a driver for the translation context devices. Set up the global IOMMU registers and initialize the context banks. Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org> Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
This commit is contained in:
Stepan Moskovchenko
Daniel Walker
parent
0720d1f052
commit
c6a5951ee5
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@ -12,7 +12,7 @@ obj-y += irq.o
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endif
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endif
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obj-$(CONFIG_ARCH_MSM8X60) += clock-dummy.o
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obj-$(CONFIG_ARCH_MSM8X60) += clock-dummy.o iommu.o iommu_dev.o
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obj-$(CONFIG_MSM_PROC_COMM) += proc_comm.o clock-pcom.o vreg.o
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obj-$(CONFIG_MSM_PROC_COMM) += clock.o
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obj-$(CONFIG_ARCH_QSD8X50) += sirc.o
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@ -0,0 +1,374 @@
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/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
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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 and
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* only version 2 as 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. See the
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* 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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/iommu.h>
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#include <linux/interrupt.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <mach/iommu_hw-8xxx.h>
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#include <mach/iommu.h>
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struct iommu_ctx_iter_data {
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/* input */
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const char *name;
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/* output */
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struct device *dev;
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};
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static struct platform_device *msm_iommu_root_dev;
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static int each_iommu_ctx(struct device *dev, void *data)
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{
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struct iommu_ctx_iter_data *res = data;
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struct msm_iommu_ctx_dev *c = dev->platform_data;
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if (!res || !c || !c->name || !res->name)
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return -EINVAL;
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if (!strcmp(res->name, c->name)) {
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res->dev = dev;
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return 1;
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}
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return 0;
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}
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static int each_iommu(struct device *dev, void *data)
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{
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return device_for_each_child(dev, data, each_iommu_ctx);
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}
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struct device *msm_iommu_get_ctx(const char *ctx_name)
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{
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struct iommu_ctx_iter_data r;
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int found;
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if (!msm_iommu_root_dev) {
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pr_err("No root IOMMU device.\n");
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goto fail;
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}
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r.name = ctx_name;
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found = device_for_each_child(&msm_iommu_root_dev->dev, &r, each_iommu);
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if (!found) {
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pr_err("Could not find context <%s>\n", ctx_name);
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goto fail;
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}
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return r.dev;
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fail:
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return NULL;
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}
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EXPORT_SYMBOL(msm_iommu_get_ctx);
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static void msm_iommu_reset(void __iomem *base)
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{
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int ctx, ncb;
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SET_RPUE(base, 0);
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SET_RPUEIE(base, 0);
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SET_ESRRESTORE(base, 0);
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SET_TBE(base, 0);
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SET_CR(base, 0);
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SET_SPDMBE(base, 0);
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SET_TESTBUSCR(base, 0);
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SET_TLBRSW(base, 0);
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SET_GLOBAL_TLBIALL(base, 0);
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SET_RPU_ACR(base, 0);
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SET_TLBLKCRWE(base, 1);
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ncb = GET_NCB(base)+1;
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for (ctx = 0; ctx < ncb; ctx++) {
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SET_BPRCOSH(base, ctx, 0);
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SET_BPRCISH(base, ctx, 0);
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SET_BPRCNSH(base, ctx, 0);
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SET_BPSHCFG(base, ctx, 0);
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SET_BPMTCFG(base, ctx, 0);
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SET_ACTLR(base, ctx, 0);
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SET_SCTLR(base, ctx, 0);
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SET_FSRRESTORE(base, ctx, 0);
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SET_TTBR0(base, ctx, 0);
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SET_TTBR1(base, ctx, 0);
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SET_TTBCR(base, ctx, 0);
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SET_BFBCR(base, ctx, 0);
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SET_PAR(base, ctx, 0);
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SET_FAR(base, ctx, 0);
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SET_CTX_TLBIALL(base, ctx, 0);
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SET_TLBFLPTER(base, ctx, 0);
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SET_TLBSLPTER(base, ctx, 0);
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SET_TLBLKCR(base, ctx, 0);
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SET_PRRR(base, ctx, 0);
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SET_NMRR(base, ctx, 0);
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SET_CONTEXTIDR(base, ctx, 0);
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}
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}
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static int msm_iommu_probe(struct platform_device *pdev)
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{
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struct resource *r;
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struct clk *iommu_clk;
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struct msm_iommu_drvdata *drvdata;
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struct msm_iommu_dev *iommu_dev = pdev->dev.platform_data;
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void __iomem *regs_base;
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resource_size_t len;
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int ret = 0, ncb, nm2v, irq;
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if (pdev->id != -1) {
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drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
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if (!drvdata) {
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ret = -ENOMEM;
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goto fail;
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}
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if (!iommu_dev) {
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ret = -ENODEV;
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goto fail;
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}
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if (iommu_dev->clk_rate != 0) {
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iommu_clk = clk_get(&pdev->dev, "iommu_clk");
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if (IS_ERR(iommu_clk)) {
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ret = -ENODEV;
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goto fail;
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}
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if (iommu_dev->clk_rate > 0) {
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ret = clk_set_rate(iommu_clk,
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iommu_dev->clk_rate);
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if (ret) {
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clk_put(iommu_clk);
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goto fail;
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}
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}
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ret = clk_enable(iommu_clk);
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if (ret) {
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clk_put(iommu_clk);
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goto fail;
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}
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clk_put(iommu_clk);
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}
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r = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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"physbase");
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if (!r) {
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ret = -ENODEV;
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goto fail;
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}
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len = r->end - r->start + 1;
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r = request_mem_region(r->start, len, r->name);
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if (!r) {
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pr_err("Could not request memory region: "
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"start=%p, len=%d\n", (void *) r->start, len);
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ret = -EBUSY;
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goto fail;
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}
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regs_base = ioremap(r->start, len);
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if (!regs_base) {
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pr_err("Could not ioremap: start=%p, len=%d\n",
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(void *) r->start, len);
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ret = -EBUSY;
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goto fail;
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}
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irq = platform_get_irq_byname(pdev, "secure_irq");
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if (irq < 0) {
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ret = -ENODEV;
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goto fail;
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}
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mb();
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if (GET_IDR(regs_base) == 0) {
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pr_err("Invalid IDR value detected\n");
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ret = -ENODEV;
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goto fail;
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}
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ret = request_irq(irq, msm_iommu_fault_handler, 0,
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"msm_iommu_secure_irpt_handler", drvdata);
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if (ret) {
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pr_err("Request IRQ %d failed with ret=%d\n", irq, ret);
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goto fail;
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}
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msm_iommu_reset(regs_base);
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drvdata->base = regs_base;
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drvdata->irq = irq;
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nm2v = GET_NM2VCBMT((unsigned long) regs_base);
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ncb = GET_NCB((unsigned long) regs_base);
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pr_info("device %s mapped at %p, irq %d with %d ctx banks\n",
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iommu_dev->name, regs_base, irq, ncb+1);
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platform_set_drvdata(pdev, drvdata);
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} else
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msm_iommu_root_dev = pdev;
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return 0;
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fail:
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kfree(drvdata);
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return ret;
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}
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static int msm_iommu_remove(struct platform_device *pdev)
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{
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struct msm_iommu_drvdata *drv = NULL;
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drv = platform_get_drvdata(pdev);
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if (drv) {
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memset(drv, 0, sizeof(struct msm_iommu_drvdata));
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kfree(drv);
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platform_set_drvdata(pdev, NULL);
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}
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return 0;
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}
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static int msm_iommu_ctx_probe(struct platform_device *pdev)
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{
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struct msm_iommu_ctx_dev *c = pdev->dev.platform_data;
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struct msm_iommu_drvdata *drvdata;
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struct msm_iommu_ctx_drvdata *ctx_drvdata = NULL;
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int i, ret = 0;
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if (!c || !pdev->dev.parent) {
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ret = -EINVAL;
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goto fail;
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}
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drvdata = dev_get_drvdata(pdev->dev.parent);
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if (!drvdata) {
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ret = -ENODEV;
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goto fail;
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}
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ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
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if (!ctx_drvdata) {
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ret = -ENOMEM;
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goto fail;
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}
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ctx_drvdata->num = c->num;
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ctx_drvdata->pdev = pdev;
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INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
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platform_set_drvdata(pdev, ctx_drvdata);
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/* Program the M2V tables for this context */
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for (i = 0; i < MAX_NUM_MIDS; i++) {
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int mid = c->mids[i];
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if (mid == -1)
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break;
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SET_M2VCBR_N(drvdata->base, mid, 0);
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SET_CBACR_N(drvdata->base, c->num, 0);
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/* Set VMID = MID */
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SET_VMID(drvdata->base, mid, mid);
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/* Set the context number for that MID to this context */
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SET_CBNDX(drvdata->base, mid, c->num);
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/* Set MID associated with this context bank */
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SET_CBVMID(drvdata->base, c->num, mid);
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/* Set security bit override to be Non-secure */
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SET_NSCFG(drvdata->base, mid, 3);
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}
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pr_info("context device %s with bank index %d\n", c->name, c->num);
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return 0;
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fail:
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kfree(ctx_drvdata);
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return ret;
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}
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static int msm_iommu_ctx_remove(struct platform_device *pdev)
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{
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struct msm_iommu_ctx_drvdata *drv = NULL;
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drv = platform_get_drvdata(pdev);
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if (drv) {
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memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata));
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kfree(drv);
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platform_set_drvdata(pdev, NULL);
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}
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return 0;
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}
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static struct platform_driver msm_iommu_driver = {
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.driver = {
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.name = "msm_iommu",
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},
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.probe = msm_iommu_probe,
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.remove = msm_iommu_remove,
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};
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static struct platform_driver msm_iommu_ctx_driver = {
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.driver = {
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.name = "msm_iommu_ctx",
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},
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.probe = msm_iommu_ctx_probe,
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.remove = msm_iommu_ctx_remove,
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};
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static int msm_iommu_driver_init(void)
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{
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int ret;
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ret = platform_driver_register(&msm_iommu_driver);
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if (ret != 0) {
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pr_err("Failed to register IOMMU driver\n");
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goto error;
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}
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ret = platform_driver_register(&msm_iommu_ctx_driver);
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if (ret != 0) {
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pr_err("Failed to register IOMMU context driver\n");
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goto error;
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}
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error:
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return ret;
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}
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static void msm_iommu_driver_exit(void)
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{
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platform_driver_unregister(&msm_iommu_ctx_driver);
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platform_driver_unregister(&msm_iommu_driver);
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}
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subsys_initcall(msm_iommu_driver_init);
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module_exit(msm_iommu_driver_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");
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