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Linux/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

  1 /*******************************************************************************
  2   This contains the functions to handle the platform driver.
  3 
  4   Copyright (C) 2007-2011  STMicroelectronics Ltd
  5 
  6   This program is free software; you can redistribute it and/or modify it
  7   under the terms and conditions of the GNU General Public License,
  8   version 2, as published by the Free Software Foundation.
  9 
 10   This program is distributed in the hope it will be useful, but WITHOUT
 11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 13   more details.
 14 
 15   You should have received a copy of the GNU General Public License along with
 16   this program; if not, write to the Free Software Foundation, Inc.,
 17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 18 
 19   The full GNU General Public License is included in this distribution in
 20   the file called "COPYING".
 21 
 22   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
 23 *******************************************************************************/
 24 
 25 #include <linux/platform_device.h>
 26 #include <linux/module.h>
 27 #include <linux/io.h>
 28 #include <linux/of.h>
 29 #include <linux/of_net.h>
 30 #include <linux/of_device.h>
 31 #include <linux/of_mdio.h>
 32 
 33 #include "stmmac.h"
 34 #include "stmmac_platform.h"
 35 
 36 #ifdef CONFIG_OF
 37 
 38 /**
 39  * dwmac1000_validate_mcast_bins - validates the number of Multicast filter bins
 40  * @mcast_bins: Multicast filtering bins
 41  * Description:
 42  * this function validates the number of Multicast filtering bins specified
 43  * by the configuration through the device tree. The Synopsys GMAC supports
 44  * 64 bins, 128 bins, or 256 bins. "bins" refer to the division of CRC
 45  * number space. 64 bins correspond to 6 bits of the CRC, 128 corresponds
 46  * to 7 bits, and 256 refers to 8 bits of the CRC. Any other setting is
 47  * invalid and will cause the filtering algorithm to use Multicast
 48  * promiscuous mode.
 49  */
 50 static int dwmac1000_validate_mcast_bins(int mcast_bins)
 51 {
 52         int x = mcast_bins;
 53 
 54         switch (x) {
 55         case HASH_TABLE_SIZE:
 56         case 128:
 57         case 256:
 58                 break;
 59         default:
 60                 x = 0;
 61                 pr_info("Hash table entries set to unexpected value %d",
 62                         mcast_bins);
 63                 break;
 64         }
 65         return x;
 66 }
 67 
 68 /**
 69  * dwmac1000_validate_ucast_entries - validate the Unicast address entries
 70  * @ucast_entries: number of Unicast address entries
 71  * Description:
 72  * This function validates the number of Unicast address entries supported
 73  * by a particular Synopsys 10/100/1000 controller. The Synopsys controller
 74  * supports 1, 32, 64, or 128 Unicast filter entries for it's Unicast filter
 75  * logic. This function validates a valid, supported configuration is
 76  * selected, and defaults to 1 Unicast address if an unsupported
 77  * configuration is selected.
 78  */
 79 static int dwmac1000_validate_ucast_entries(int ucast_entries)
 80 {
 81         int x = ucast_entries;
 82 
 83         switch (x) {
 84         case 1:
 85         case 32:
 86         case 64:
 87         case 128:
 88                 break;
 89         default:
 90                 x = 1;
 91                 pr_info("Unicast table entries set to unexpected value %d\n",
 92                         ucast_entries);
 93                 break;
 94         }
 95         return x;
 96 }
 97 
 98 /**
 99  * stmmac_probe_config_dt - parse device-tree driver parameters
100  * @pdev: platform_device structure
101  * @plat: driver data platform structure
102  * @mac: MAC address to use
103  * Description:
104  * this function is to read the driver parameters from device-tree and
105  * set some private fields that will be used by the main at runtime.
106  */
107 struct plat_stmmacenet_data *
108 stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
109 {
110         struct device_node *np = pdev->dev.of_node;
111         struct plat_stmmacenet_data *plat;
112         struct stmmac_dma_cfg *dma_cfg;
113 
114         plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
115         if (!plat)
116                 return ERR_PTR(-ENOMEM);
117 
118         *mac = of_get_mac_address(np);
119         plat->interface = of_get_phy_mode(np);
120 
121         /* Get max speed of operation from device tree */
122         if (of_property_read_u32(np, "max-speed", &plat->max_speed))
123                 plat->max_speed = -1;
124 
125         plat->bus_id = of_alias_get_id(np, "ethernet");
126         if (plat->bus_id < 0)
127                 plat->bus_id = 0;
128 
129         /* Default to phy auto-detection */
130         plat->phy_addr = -1;
131 
132         /* If we find a phy-handle property, use it as the PHY */
133         plat->phy_node = of_parse_phandle(np, "phy-handle", 0);
134 
135         /* If phy-handle is not specified, check if we have a fixed-phy */
136         if (!plat->phy_node && of_phy_is_fixed_link(np)) {
137                 if ((of_phy_register_fixed_link(np) < 0))
138                         return ERR_PTR(-ENODEV);
139 
140                 plat->phy_node = of_node_get(np);
141         }
142 
143         /* "snps,phy-addr" is not a standard property. Mark it as deprecated
144          * and warn of its use. Remove this when phy node support is added.
145          */
146         if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
147                 dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
148 
149         if (plat->phy_node || plat->phy_bus_name)
150                 plat->mdio_bus_data = NULL;
151         else
152                 plat->mdio_bus_data =
153                         devm_kzalloc(&pdev->dev,
154                                      sizeof(struct stmmac_mdio_bus_data),
155                                      GFP_KERNEL);
156 
157         of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);
158 
159         of_property_read_u32(np, "rx-fifo-depth", &plat->rx_fifo_size);
160 
161         plat->force_sf_dma_mode =
162                 of_property_read_bool(np, "snps,force_sf_dma_mode");
163 
164         /* Set the maxmtu to a default of JUMBO_LEN in case the
165          * parameter is not present in the device tree.
166          */
167         plat->maxmtu = JUMBO_LEN;
168 
169         /* Set default value for multicast hash bins */
170         plat->multicast_filter_bins = HASH_TABLE_SIZE;
171 
172         /* Set default value for unicast filter entries */
173         plat->unicast_filter_entries = 1;
174 
175         /*
176          * Currently only the properties needed on SPEAr600
177          * are provided. All other properties should be added
178          * once needed on other platforms.
179          */
180         if (of_device_is_compatible(np, "st,spear600-gmac") ||
181                 of_device_is_compatible(np, "snps,dwmac-3.70a") ||
182                 of_device_is_compatible(np, "snps,dwmac")) {
183                 /* Note that the max-frame-size parameter as defined in the
184                  * ePAPR v1.1 spec is defined as max-frame-size, it's
185                  * actually used as the IEEE definition of MAC Client
186                  * data, or MTU. The ePAPR specification is confusing as
187                  * the definition is max-frame-size, but usage examples
188                  * are clearly MTUs
189                  */
190                 of_property_read_u32(np, "max-frame-size", &plat->maxmtu);
191                 of_property_read_u32(np, "snps,multicast-filter-bins",
192                                      &plat->multicast_filter_bins);
193                 of_property_read_u32(np, "snps,perfect-filter-entries",
194                                      &plat->unicast_filter_entries);
195                 plat->unicast_filter_entries = dwmac1000_validate_ucast_entries(
196                                                plat->unicast_filter_entries);
197                 plat->multicast_filter_bins = dwmac1000_validate_mcast_bins(
198                                               plat->multicast_filter_bins);
199                 plat->has_gmac = 1;
200                 plat->pmt = 1;
201         }
202 
203         if (of_device_is_compatible(np, "snps,dwmac-3.610") ||
204                 of_device_is_compatible(np, "snps,dwmac-3.710")) {
205                 plat->enh_desc = 1;
206                 plat->bugged_jumbo = 1;
207                 plat->force_sf_dma_mode = 1;
208         }
209 
210         if (of_find_property(np, "snps,pbl", NULL)) {
211                 dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg),
212                                        GFP_KERNEL);
213                 if (!dma_cfg) {
214                         of_node_put(np);
215                         return ERR_PTR(-ENOMEM);
216                 }
217                 plat->dma_cfg = dma_cfg;
218                 of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
219                 dma_cfg->fixed_burst =
220                         of_property_read_bool(np, "snps,fixed-burst");
221                 dma_cfg->mixed_burst =
222                         of_property_read_bool(np, "snps,mixed-burst");
223                 of_property_read_u32(np, "snps,burst_len", &dma_cfg->burst_len);
224                 if (dma_cfg->burst_len < 0 || dma_cfg->burst_len > 256)
225                         dma_cfg->burst_len = 0;
226         }
227         plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
228         if (plat->force_thresh_dma_mode) {
229                 plat->force_sf_dma_mode = 0;
230                 pr_warn("force_sf_dma_mode is ignored if force_thresh_dma_mode is set.");
231         }
232 
233         return plat;
234 }
235 #else
236 struct plat_stmmacenet_data *
237 stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
238 {
239         return ERR_PTR(-ENOSYS);
240 }
241 #endif /* CONFIG_OF */
242 EXPORT_SYMBOL_GPL(stmmac_probe_config_dt);
243 
244 int stmmac_get_platform_resources(struct platform_device *pdev,
245                                   struct stmmac_resources *stmmac_res)
246 {
247         struct resource *res;
248 
249         memset(stmmac_res, 0, sizeof(*stmmac_res));
250 
251         /* Get IRQ information early to have an ability to ask for deferred
252          * probe if needed before we went too far with resource allocation.
253          */
254         stmmac_res->irq = platform_get_irq_byname(pdev, "macirq");
255         if (stmmac_res->irq < 0) {
256                 if (stmmac_res->irq != -EPROBE_DEFER) {
257                         dev_err(&pdev->dev,
258                                 "MAC IRQ configuration information not found\n");
259                 }
260                 return stmmac_res->irq;
261         }
262 
263         /* On some platforms e.g. SPEAr the wake up irq differs from the mac irq
264          * The external wake up irq can be passed through the platform code
265          * named as "eth_wake_irq"
266          *
267          * In case the wake up interrupt is not passed from the platform
268          * so the driver will continue to use the mac irq (ndev->irq)
269          */
270         stmmac_res->wol_irq = platform_get_irq_byname(pdev, "eth_wake_irq");
271         if (stmmac_res->wol_irq < 0) {
272                 if (stmmac_res->wol_irq == -EPROBE_DEFER)
273                         return -EPROBE_DEFER;
274                 stmmac_res->wol_irq = stmmac_res->irq;
275         }
276 
277         stmmac_res->lpi_irq = platform_get_irq_byname(pdev, "eth_lpi");
278         if (stmmac_res->lpi_irq == -EPROBE_DEFER)
279                 return -EPROBE_DEFER;
280 
281         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
282         stmmac_res->addr = devm_ioremap_resource(&pdev->dev, res);
283 
284         return PTR_ERR_OR_ZERO(stmmac_res->addr);
285 }
286 EXPORT_SYMBOL_GPL(stmmac_get_platform_resources);
287 
288 /**
289  * stmmac_pltfr_remove
290  * @pdev: platform device pointer
291  * Description: this function calls the main to free the net resources
292  * and calls the platforms hook and release the resources (e.g. mem).
293  */
294 int stmmac_pltfr_remove(struct platform_device *pdev)
295 {
296         struct net_device *ndev = platform_get_drvdata(pdev);
297         struct stmmac_priv *priv = netdev_priv(ndev);
298         int ret = stmmac_dvr_remove(ndev);
299 
300         if (priv->plat->exit)
301                 priv->plat->exit(pdev, priv->plat->bsp_priv);
302 
303         return ret;
304 }
305 EXPORT_SYMBOL_GPL(stmmac_pltfr_remove);
306 
307 #ifdef CONFIG_PM_SLEEP
308 /**
309  * stmmac_pltfr_suspend
310  * @dev: device pointer
311  * Description: this function is invoked when suspend the driver and it direcly
312  * call the main suspend function and then, if required, on some platform, it
313  * can call an exit helper.
314  */
315 static int stmmac_pltfr_suspend(struct device *dev)
316 {
317         int ret;
318         struct net_device *ndev = dev_get_drvdata(dev);
319         struct stmmac_priv *priv = netdev_priv(ndev);
320         struct platform_device *pdev = to_platform_device(dev);
321 
322         ret = stmmac_suspend(ndev);
323         if (priv->plat->exit)
324                 priv->plat->exit(pdev, priv->plat->bsp_priv);
325 
326         return ret;
327 }
328 
329 /**
330  * stmmac_pltfr_resume
331  * @dev: device pointer
332  * Description: this function is invoked when resume the driver before calling
333  * the main resume function, on some platforms, it can call own init helper
334  * if required.
335  */
336 static int stmmac_pltfr_resume(struct device *dev)
337 {
338         struct net_device *ndev = dev_get_drvdata(dev);
339         struct stmmac_priv *priv = netdev_priv(ndev);
340         struct platform_device *pdev = to_platform_device(dev);
341 
342         if (priv->plat->init)
343                 priv->plat->init(pdev, priv->plat->bsp_priv);
344 
345         return stmmac_resume(ndev);
346 }
347 #endif /* CONFIG_PM_SLEEP */
348 
349 SIMPLE_DEV_PM_OPS(stmmac_pltfr_pm_ops, stmmac_pltfr_suspend,
350                                        stmmac_pltfr_resume);
351 EXPORT_SYMBOL_GPL(stmmac_pltfr_pm_ops);
352 
353 MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet platform support");
354 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
355 MODULE_LICENSE("GPL");
356 

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