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2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87 
 kernel/arch/x86/pci/sta2x11-fixup.c
....@@ -1,25 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
2
- * arch/x86/pci/sta2x11-fixup.c
3
- * glue code for lib/swiotlb.c and DMA translation between STA2x11
4
- * AMBA memory mapping and the X86 memory mapping
3
+ * DMA translation between STA2x11 AMBA memory mapping and the x86 memory mapping
54  *
65  * ST Microelectronics ConneXt (STA2X11/STA2X10)
76  *
87  * Copyright (c) 2010-2011 Wind River Systems, Inc.
9
- *
10
- * This program is free software; you can redistribute it and/or modify
11
- * it under the terms of the GNU General Public License version 2 as
12
- * 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
20
- * 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
22
- *
238  */
249 
2510 #include <linux/pci.h>
....@@ -30,7 +15,6 @@
3015 #include <asm/iommu.h>
3116 
3217 #define STA2X11_SWIOTLB_SIZE (4*1024*1024)
33
-extern int swiotlb_late_init_with_default_size(size_t default_size);
3418 
3519 /*
3620  * We build a list of bus numbers that are under the ConneXt. The
....@@ -45,7 +29,6 @@
4529 };
4630 
4731 struct sta2x11_mapping {
48
-	u32 amba_base;
4932 	int is_suspended;
5033 	struct sta2x11_ahb_regs regs[STA2X11_NR_FUNCS];
5134 };
....@@ -107,57 +90,12 @@
10790 	return pdev->bus->number - instance->bus0;
10891 }
10992 
110
-static struct sta2x11_mapping *sta2x11_pdev_to_mapping(struct pci_dev *pdev)
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-{
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-	struct sta2x11_instance *instance;
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-	int ep;
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-
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-	instance = sta2x11_pdev_to_instance(pdev);
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-	if (!instance)
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-		return NULL;
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-	ep = sta2x11_pdev_to_ep(pdev);
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-	return instance->map + ep;
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-}
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-
12293 /* This is exported, as some devices need to access the MFD registers */
12394 struct sta2x11_instance *sta2x11_get_instance(struct pci_dev *pdev)
12495 {
12596 	return sta2x11_pdev_to_instance(pdev);
12697 }
12798 EXPORT_SYMBOL(sta2x11_get_instance);
128
-
129
-
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-/**
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- * p2a - Translate physical address to STA2x11 AMBA address,
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- *       used for DMA transfers to STA2x11
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- * @p: Physical address
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- * @pdev: PCI device (must be hosted within the connext)
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- */
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-static dma_addr_t p2a(dma_addr_t p, struct pci_dev *pdev)
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-{
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-	struct sta2x11_mapping *map;
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-	dma_addr_t a;
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-
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-	map = sta2x11_pdev_to_mapping(pdev);
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-	a = p + map->amba_base;
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-	return a;
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-}
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-
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-/**
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- * a2p - Translate STA2x11 AMBA address to physical address
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- *       used for DMA transfers from STA2x11
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- * @a: STA2x11 AMBA address
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- * @pdev: PCI device (must be hosted within the connext)
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- */
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-static dma_addr_t a2p(dma_addr_t a, struct pci_dev *pdev)
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-{
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-	struct sta2x11_mapping *map;
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-	dma_addr_t p;
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-
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-	map = sta2x11_pdev_to_mapping(pdev);
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-	p = a - map->amba_base;
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-	return p;
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-}
16199 
162100 /* At setup time, we use our own ops if the device is a ConneXt one */
163101 static void sta2x11_setup_pdev(struct pci_dev *pdev)
....@@ -166,70 +104,11 @@
166104 
167105 	if (!instance) /* either a sta2x11 bridge or another ST device */
168106 		return;
169
-	pci_set_consistent_dma_mask(pdev, STA2X11_AMBA_SIZE - 1);
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-	pci_set_dma_mask(pdev, STA2X11_AMBA_SIZE - 1);
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-	pdev->dev.dma_ops = &swiotlb_dma_ops;
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-	pdev->dev.archdata.is_sta2x11 = true;
173107 
174108 	/* We must enable all devices as master, for audio DMA to work */
175109 	pci_set_master(pdev);
176110 }
177111 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_setup_pdev);
178
-
179
-/*
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- * The following three functions are exported (used in swiotlb: FIXME)
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- */
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-/**
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- * dma_capable - Check if device can manage DMA transfers (FIXME: kill it)
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- * @dev: device for a PCI device
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- * @addr: DMA address
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- * @size: DMA size
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- */
188
-bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
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-{
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-	struct sta2x11_mapping *map;
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-
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-	if (!dev->archdata.is_sta2x11) {
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-		if (!dev->dma_mask)
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-			return false;
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-		return addr + size - 1 <= *dev->dma_mask;
196
-	}
197
-
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-	map = sta2x11_pdev_to_mapping(to_pci_dev(dev));
199
-
200
-	if (!map || (addr < map->amba_base))
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-		return false;
202
-	if (addr + size >= map->amba_base + STA2X11_AMBA_SIZE) {
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-		return false;
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-	}
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-
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-	return true;
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-}
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-
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-/**
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- * __phys_to_dma - Return the DMA AMBA address used for this STA2x11 device
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- * @dev: device for a PCI device
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- * @paddr: Physical address
213
- */
214
-dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
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-{
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-	if (!dev->archdata.is_sta2x11)
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-		return paddr;
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-	return p2a(paddr, to_pci_dev(dev));
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-}
220
-
221
-/**
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- * dma_to_phys - Return the physical address used for this STA2x11 DMA address
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- * @dev: device for a PCI device
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- * @daddr: STA2x11 AMBA DMA address
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- */
226
-phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
227
-{
228
-	if (!dev->archdata.is_sta2x11)
229
-		return daddr;
230
-	return a2p(daddr, to_pci_dev(dev));
231
-}
232
-
233112 
234113 /*
235114  * At boot we must set up the mappings for the pcie-to-amba bridge.
....@@ -250,12 +129,24 @@
250129 /* At probe time, enable mapping for each endpoint, using the pdev */
251130 static void sta2x11_map_ep(struct pci_dev *pdev)
252131 {
253
-	struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
254
-	int i;
132
+	struct sta2x11_instance *instance = sta2x11_pdev_to_instance(pdev);
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+	struct device *dev = &pdev->dev;
134
+	u32 amba_base, max_amba_addr;
135
+	int i, ret;
255136 
256
-	if (!map)
137
+	if (!instance)
257138 		return;
258
-	pci_read_config_dword(pdev, AHB_BASE(0), &map->amba_base);
139
+
140
+	pci_read_config_dword(pdev, AHB_BASE(0), &amba_base);
141
+	max_amba_addr = amba_base + STA2X11_AMBA_SIZE - 1;
142
+
143
+	ret = dma_direct_set_offset(dev, 0, amba_base, STA2X11_AMBA_SIZE);
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+	if (ret)
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+		dev_err(dev, "sta2x11: could not set DMA offset\n");
146
+
147
+	dev->bus_dma_limit = max_amba_addr;
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+	pci_set_consistent_dma_mask(pdev, max_amba_addr);
149
+	pci_set_dma_mask(pdev, max_amba_addr);
259150 
260151 	/* Configure AHB mapping */
261152 	pci_write_config_dword(pdev, AHB_PEXLBASE(0), 0);
....@@ -269,13 +160,24 @@
269160 
270161 	dev_info(&pdev->dev,
271162 		 "sta2x11: Map EP %i: AMBA address %#8x-%#8x\n",
272
-		 sta2x11_pdev_to_ep(pdev),  map->amba_base,
273
-		 map->amba_base + STA2X11_AMBA_SIZE - 1);
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+		 sta2x11_pdev_to_ep(pdev), amba_base, max_amba_addr);
274164 }
275165 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_map_ep);
276166 
277167 #ifdef CONFIG_PM /* Some register values must be saved and restored */
278168 
169
+static struct sta2x11_mapping *sta2x11_pdev_to_mapping(struct pci_dev *pdev)
170
+{
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+	struct sta2x11_instance *instance;
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+	int ep;
173
+
174
+	instance = sta2x11_pdev_to_instance(pdev);
175
+	if (!instance)
176
+		return NULL;
177
+	ep = sta2x11_pdev_to_ep(pdev);
178
+	return instance->map + ep;
179
+}
180
+
279181 static void suspend_mapping(struct pci_dev *pdev)
280182 {
281183 	struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);