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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         struct device_node *child_node = NULL;
114 
115         plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
116         if (!plat)
117                 return ERR_PTR(-ENOMEM);
118 
119         *mac = of_get_mac_address(np);
120         plat->interface = of_get_phy_mode(np);
121 
122         /* Get max speed of operation from device tree */
123         if (of_property_read_u32(np, "max-speed", &plat->max_speed))
124                 plat->max_speed = -1;
125 
126         plat->bus_id = of_alias_get_id(np, "ethernet");
127         if (plat->bus_id < 0)
128                 plat->bus_id = 0;
129 
130         /* Default to phy auto-detection */
131         plat->phy_addr = -1;
132 
133         /* If we find a phy-handle property, use it as the PHY */
134         plat->phy_node = of_parse_phandle(np, "phy-handle", 0);
135 
136         /* If phy-handle is not specified, check if we have a fixed-phy */
137         if (!plat->phy_node && of_phy_is_fixed_link(np)) {
138                 if ((of_phy_register_fixed_link(np) < 0))
139                         return ERR_PTR(-ENODEV);
140 
141                 plat->phy_node = of_node_get(np);
142         }
143 
144         for_each_child_of_node(np, child_node)
145                 if (of_device_is_compatible(child_node, "snps,dwmac-mdio")) {
146                         plat->mdio_node = child_node;
147                         break;
148                 }
149 
150         /* "snps,phy-addr" is not a standard property. Mark it as deprecated
151          * and warn of its use. Remove this when phy node support is added.
152          */
153         if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
154                 dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
155 
156         if ((plat->phy_node && !of_phy_is_fixed_link(np)) || !plat->mdio_node)
157                 plat->mdio_bus_data = NULL;
158         else
159                 plat->mdio_bus_data =
160                         devm_kzalloc(&pdev->dev,
161                                      sizeof(struct stmmac_mdio_bus_data),
162                                      GFP_KERNEL);
163 
164         of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);
165 
166         of_property_read_u32(np, "rx-fifo-depth", &plat->rx_fifo_size);
167 
168         plat->force_sf_dma_mode =
169                 of_property_read_bool(np, "snps,force_sf_dma_mode");
170 
171         /* Set the maxmtu to a default of JUMBO_LEN in case the
172          * parameter is not present in the device tree.
173          */
174         plat->maxmtu = JUMBO_LEN;
175 
176         /* Set default value for multicast hash bins */
177         plat->multicast_filter_bins = HASH_TABLE_SIZE;
178 
179         /* Set default value for unicast filter entries */
180         plat->unicast_filter_entries = 1;
181 
182         /*
183          * Currently only the properties needed on SPEAr600
184          * are provided. All other properties should be added
185          * once needed on other platforms.
186          */
187         if (of_device_is_compatible(np, "st,spear600-gmac") ||
188                 of_device_is_compatible(np, "snps,dwmac-3.70a") ||
189                 of_device_is_compatible(np, "snps,dwmac")) {
190                 /* Note that the max-frame-size parameter as defined in the
191                  * ePAPR v1.1 spec is defined as max-frame-size, it's
192                  * actually used as the IEEE definition of MAC Client
193                  * data, or MTU. The ePAPR specification is confusing as
194                  * the definition is max-frame-size, but usage examples
195                  * are clearly MTUs
196                  */
197                 of_property_read_u32(np, "max-frame-size", &plat->maxmtu);
198                 of_property_read_u32(np, "snps,multicast-filter-bins",
199                                      &plat->multicast_filter_bins);
200                 of_property_read_u32(np, "snps,perfect-filter-entries",
201                                      &plat->unicast_filter_entries);
202                 plat->unicast_filter_entries = dwmac1000_validate_ucast_entries(
203                                                plat->unicast_filter_entries);
204                 plat->multicast_filter_bins = dwmac1000_validate_mcast_bins(
205                                               plat->multicast_filter_bins);
206                 plat->has_gmac = 1;
207                 plat->pmt = 1;
208         }
209 
210         if (of_device_is_compatible(np, "snps,dwmac-3.610") ||
211                 of_device_is_compatible(np, "snps,dwmac-3.710")) {
212                 plat->enh_desc = 1;
213                 plat->bugged_jumbo = 1;
214                 plat->force_sf_dma_mode = 1;
215         }
216 
217         if (of_find_property(np, "snps,pbl", NULL)) {
218                 dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg),
219                                        GFP_KERNEL);
220                 if (!dma_cfg) {
221                         of_node_put(np);
222                         return ERR_PTR(-ENOMEM);
223                 }
224                 plat->dma_cfg = dma_cfg;
225                 of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
226                 dma_cfg->fixed_burst =
227                         of_property_read_bool(np, "snps,fixed-burst");
228                 dma_cfg->mixed_burst =
229                         of_property_read_bool(np, "snps,mixed-burst");
230                 of_property_read_u32(np, "snps,burst_len", &dma_cfg->burst_len);
231                 if (dma_cfg->burst_len < 0 || dma_cfg->burst_len > 256)
232                         dma_cfg->burst_len = 0;
233         }
234         plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
235         if (plat->force_thresh_dma_mode) {
236                 plat->force_sf_dma_mode = 0;
237                 pr_warn("force_sf_dma_mode is ignored if force_thresh_dma_mode is set.");
238         }
239 
240         return plat;
241 }
242 #else
243 struct plat_stmmacenet_data *
244 stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
245 {
246         return ERR_PTR(-ENOSYS);
247 }
248 #endif /* CONFIG_OF */
249 EXPORT_SYMBOL_GPL(stmmac_probe_config_dt);
250 
251 int stmmac_get_platform_resources(struct platform_device *pdev,
252                                   struct stmmac_resources *stmmac_res)
253 {
254         struct resource *res;
255 
256         memset(stmmac_res, 0, sizeof(*stmmac_res));
257 
258         /* Get IRQ information early to have an ability to ask for deferred
259          * probe if needed before we went too far with resource allocation.
260          */
261         stmmac_res->irq = platform_get_irq_byname(pdev, "macirq");
262         if (stmmac_res->irq < 0) {
263                 if (stmmac_res->irq != -EPROBE_DEFER) {
264                         dev_err(&pdev->dev,
265                                 "MAC IRQ configuration information not found\n");
266                 }
267                 return stmmac_res->irq;
268         }
269 
270         /* On some platforms e.g. SPEAr the wake up irq differs from the mac irq
271          * The external wake up irq can be passed through the platform code
272          * named as "eth_wake_irq"
273          *
274          * In case the wake up interrupt is not passed from the platform
275          * so the driver will continue to use the mac irq (ndev->irq)
276          */
277         stmmac_res->wol_irq = platform_get_irq_byname(pdev, "eth_wake_irq");
278         if (stmmac_res->wol_irq < 0) {
279                 if (stmmac_res->wol_irq == -EPROBE_DEFER)
280                         return -EPROBE_DEFER;
281                 stmmac_res->wol_irq = stmmac_res->irq;
282         }
283 
284         stmmac_res->lpi_irq = platform_get_irq_byname(pdev, "eth_lpi");
285         if (stmmac_res->lpi_irq == -EPROBE_DEFER)
286                 return -EPROBE_DEFER;
287 
288         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
289         stmmac_res->addr = devm_ioremap_resource(&pdev->dev, res);
290 
291         return PTR_ERR_OR_ZERO(stmmac_res->addr);
292 }
293 EXPORT_SYMBOL_GPL(stmmac_get_platform_resources);
294 
295 /**
296  * stmmac_pltfr_remove
297  * @pdev: platform device pointer
298  * Description: this function calls the main to free the net resources
299  * and calls the platforms hook and release the resources (e.g. mem).
300  */
301 int stmmac_pltfr_remove(struct platform_device *pdev)
302 {
303         struct net_device *ndev = platform_get_drvdata(pdev);
304         struct stmmac_priv *priv = netdev_priv(ndev);
305         int ret = stmmac_dvr_remove(ndev);
306 
307         if (priv->plat->exit)
308                 priv->plat->exit(pdev, priv->plat->bsp_priv);
309 
310         return ret;
311 }
312 EXPORT_SYMBOL_GPL(stmmac_pltfr_remove);
313 
314 #ifdef CONFIG_PM_SLEEP
315 /**
316  * stmmac_pltfr_suspend
317  * @dev: device pointer
318  * Description: this function is invoked when suspend the driver and it direcly
319  * call the main suspend function and then, if required, on some platform, it
320  * can call an exit helper.
321  */
322 static int stmmac_pltfr_suspend(struct device *dev)
323 {
324         int ret;
325         struct net_device *ndev = dev_get_drvdata(dev);
326         struct stmmac_priv *priv = netdev_priv(ndev);
327         struct platform_device *pdev = to_platform_device(dev);
328 
329         ret = stmmac_suspend(ndev);
330         if (priv->plat->exit)
331                 priv->plat->exit(pdev, priv->plat->bsp_priv);
332 
333         return ret;
334 }
335 
336 /**
337  * stmmac_pltfr_resume
338  * @dev: device pointer
339  * Description: this function is invoked when resume the driver before calling
340  * the main resume function, on some platforms, it can call own init helper
341  * if required.
342  */
343 static int stmmac_pltfr_resume(struct device *dev)
344 {
345         struct net_device *ndev = dev_get_drvdata(dev);
346         struct stmmac_priv *priv = netdev_priv(ndev);
347         struct platform_device *pdev = to_platform_device(dev);
348 
349         if (priv->plat->init)
350                 priv->plat->init(pdev, priv->plat->bsp_priv);
351 
352         return stmmac_resume(ndev);
353 }
354 #endif /* CONFIG_PM_SLEEP */
355 
356 SIMPLE_DEV_PM_OPS(stmmac_pltfr_pm_ops, stmmac_pltfr_suspend,
357                                        stmmac_pltfr_resume);
358 EXPORT_SYMBOL_GPL(stmmac_pltfr_pm_ops);
359 
360 MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet platform support");
361 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
362 MODULE_LICENSE("GPL");
363 

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