arch/powerpc/platforms/82xx/ep8248e.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Embedded Planet EP8248E support
   4  *
   5  * Copyright 2007 Freescale Semiconductor, Inc.
   6  * Author: Scott Wood <scottwood@freescale.com>
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/fsl_devices.h>
  12 #include <linux/mdio-bitbang.h>
  13 #include <linux/of_mdio.h>
  14 #include <linux/slab.h>
  15 #include <linux/of_platform.h>
  16
  17 #include <asm/io.h>
  18 #include <asm/cpm2.h>
  19 #include <asm/udbg.h>
  20 #include <asm/machdep.h>
  21 #include <asm/time.h>
  22 #include <asm/mpc8260.h>
  23 #include <asm/prom.h>
  24
  25 #include <sysdev/fsl_soc.h>
  26 #include <sysdev/cpm2_pic.h>
  27
  28 #include "pq2.h"
  29
  30 static u8 __iomem *ep8248e_bcsr;
  31 static struct device_node *ep8248e_bcsr_node;
  32
  33 #define BCSR7_SCC2_ENABLE 0x10
  34
  35 #define BCSR8_PHY1_ENABLE 0x80
  36 #define BCSR8_PHY1_POWER  0x40
  37 #define BCSR8_PHY2_ENABLE 0x20
  38 #define BCSR8_PHY2_POWER  0x10
  39 #define BCSR8_MDIO_READ   0x04
  40 #define BCSR8_MDIO_CLOCK  0x02
  41 #define BCSR8_MDIO_DATA   0x01
  42
  43 #define BCSR9_USB_ENABLE  0x80
  44 #define BCSR9_USB_POWER   0x40
  45 #define BCSR9_USB_HOST    0x20
  46 #define BCSR9_USB_FULL_SPEED_TARGET 0x10
  47
  48 static void __init ep8248e_pic_init(void)
  49 {
  50         struct device_node *np = of_find_compatible_node(NULL, NULL, "fsl,pq2-pic");
  51         if (!np) {
  52                 printk(KERN_ERR "PIC init: can not find cpm-pic node\n");
  53                 return;
  54         }
  55
  56         cpm2_pic_init(np);
  57         of_node_put(np);
  58 }
  59
  60 static void ep8248e_set_mdc(struct mdiobb_ctrl *ctrl, int level)
  61 {
  62         if (level)
  63                 setbits8(&ep8248e_bcsr[8], BCSR8_MDIO_CLOCK);
  64         else
  65                 clrbits8(&ep8248e_bcsr[8], BCSR8_MDIO_CLOCK);
  66
  67         /* Read back to flush the write. */
  68         in_8(&ep8248e_bcsr[8]);
  69 }
  70
  71 static void ep8248e_set_mdio_dir(struct mdiobb_ctrl *ctrl, int output)
  72 {
  73         if (output)
  74                 clrbits8(&ep8248e_bcsr[8], BCSR8_MDIO_READ);
  75         else
  76                 setbits8(&ep8248e_bcsr[8], BCSR8_MDIO_READ);
  77
  78         /* Read back to flush the write. */
  79         in_8(&ep8248e_bcsr[8]);
  80 }
  81
  82 static void ep8248e_set_mdio_data(struct mdiobb_ctrl *ctrl, int data)
  83 {
  84         if (data)
  85                 setbits8(&ep8248e_bcsr[8], BCSR8_MDIO_DATA);
  86         else
  87                 clrbits8(&ep8248e_bcsr[8], BCSR8_MDIO_DATA);
  88
  89         /* Read back to flush the write. */
  90         in_8(&ep8248e_bcsr[8]);
  91 }
  92
  93 static int ep8248e_get_mdio_data(struct mdiobb_ctrl *ctrl)
  94 {
  95         return in_8(&ep8248e_bcsr[8]) & BCSR8_MDIO_DATA;
  96 }
  97
  98 static const struct mdiobb_ops ep8248e_mdio_ops = {
  99         .set_mdc = ep8248e_set_mdc,
 100         .set_mdio_dir = ep8248e_set_mdio_dir,
 101         .set_mdio_data = ep8248e_set_mdio_data,
 102         .get_mdio_data = ep8248e_get_mdio_data,
 103         .owner = THIS_MODULE,
 104 };
 105
 106 static struct mdiobb_ctrl ep8248e_mdio_ctrl = {
 107         .ops = &ep8248e_mdio_ops,
 108 };
 109
 110 static int ep8248e_mdio_probe(struct platform_device *ofdev)
 111 {
 112         struct mii_bus *bus;
 113         struct resource res;
 114         struct device_node *node;
 115         int ret;
 116
 117         node = of_get_parent(ofdev->dev.of_node);
 118         of_node_put(node);
 119         if (node != ep8248e_bcsr_node)
 120                 return -ENODEV;
 121
 122         ret = of_address_to_resource(ofdev->dev.of_node, 0, &res);
 123         if (ret)
 124                 return ret;
 125
 126         bus = alloc_mdio_bitbang(&ep8248e_mdio_ctrl);
 127         if (!bus)
 128                 return -ENOMEM;
 129
 130         bus->name = "ep8248e-mdio-bitbang";
 131         bus->parent = &ofdev->dev;
 132         snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 133
 134         ret = of_mdiobus_register(bus, ofdev->dev.of_node);
 135         if (ret)
 136                 goto err_free_bus;
 137
 138         return 0;
 139 err_free_bus:
 140         free_mdio_bitbang(bus);
 141         return ret;
 142 }
 143
 144 static int ep8248e_mdio_remove(struct platform_device *ofdev)
 145 {
 146         BUG();
 147         return 0;
 148 }
 149
 150 static const struct of_device_id ep8248e_mdio_match[] = {
 151         {
 152                 .compatible = "fsl,ep8248e-mdio-bitbang",
 153         },
 154         {},
 155 };
 156
 157 static struct platform_driver ep8248e_mdio_driver = {
 158         .driver = {
 159                 .name = "ep8248e-mdio-bitbang",
 160                 .of_match_table = ep8248e_mdio_match,
 161         },
 162         .probe = ep8248e_mdio_probe,
 163         .remove = ep8248e_mdio_remove,
 164 };
 165
 166 struct cpm_pin {
 167         int port, pin, flags;
 168 };
 169
 170 static __initdata struct cpm_pin ep8248e_pins[] = {
 171         /* SMC1 */
 172         {2, 4, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 173         {2, 5, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 174
 175         /* SCC1 */
 176         {2, 14, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 177         {2, 15, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 178         {3, 29, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 179         {3, 30, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
 180         {3, 31, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 181
 182         /* FCC1 */
 183         {0, 14, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 184         {0, 15, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 185         {0, 16, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 186         {0, 17, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 187         {0, 18, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 188         {0, 19, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 189         {0, 20, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 190         {0, 21, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 191         {0, 26, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
 192         {0, 27, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
 193         {0, 28, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
 194         {0, 29, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
 195         {0, 30, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
 196         {0, 31, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
 197         {2, 21, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 198         {2, 22, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 199
 200         /* FCC2 */
 201         {1, 18, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 202         {1, 19, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 203         {1, 20, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 204         {1, 21, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 205         {1, 22, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 206         {1, 23, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 207         {1, 24, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 208         {1, 25, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 209         {1, 26, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 210         {1, 27, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 211         {1, 28, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 212         {1, 29, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
 213         {1, 30, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 214         {1, 31, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 215         {2, 18, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 216         {2, 19, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 217
 218         /* I2C */
 219         {4, 14, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
 220         {4, 15, CPM_PIN_INPUT | CPM_PIN_SECONDARY},
 221
 222         /* USB */
 223         {2, 10, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 224         {2, 11, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 225         {2, 20, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 226         {2, 24, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 227         {3, 23, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 228         {3, 24, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 229         {3, 25, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 230 };
 231
 232 static void __init init_ioports(void)
 233 {
 234         int i;
 235
 236         for (i = 0; i < ARRAY_SIZE(ep8248e_pins); i++) {
 237                 const struct cpm_pin *pin = &ep8248e_pins[i];
 238                 cpm2_set_pin(pin->port, pin->pin, pin->flags);
 239         }
 240
 241         cpm2_smc_clk_setup(CPM_CLK_SMC1, CPM_BRG7);
 242         cpm2_clk_setup(CPM_CLK_SCC1, CPM_BRG1, CPM_CLK_RX);
 243         cpm2_clk_setup(CPM_CLK_SCC1, CPM_BRG1, CPM_CLK_TX);
 244         cpm2_clk_setup(CPM_CLK_SCC3, CPM_CLK8, CPM_CLK_TX); /* USB */
 245         cpm2_clk_setup(CPM_CLK_FCC1, CPM_CLK11, CPM_CLK_RX);
 246         cpm2_clk_setup(CPM_CLK_FCC1, CPM_CLK10, CPM_CLK_TX);
 247         cpm2_clk_setup(CPM_CLK_FCC2, CPM_CLK13, CPM_CLK_RX);
 248         cpm2_clk_setup(CPM_CLK_FCC2, CPM_CLK14, CPM_CLK_TX);
 249 }
 250
 251 static void __init ep8248e_setup_arch(void)
 252 {
 253         if (ppc_md.progress)
 254                 ppc_md.progress("ep8248e_setup_arch()", 0);
 255
 256         cpm2_reset();
 257
 258         /* When this is set, snooping CPM DMA from RAM causes
 259          * machine checks.  See erratum SIU18.
 260          */
 261         clrbits32(&cpm2_immr->im_siu_conf.siu_82xx.sc_bcr, MPC82XX_BCR_PLDP);
 262
 263         ep8248e_bcsr_node =
 264                 of_find_compatible_node(NULL, NULL, "fsl,ep8248e-bcsr");
 265         if (!ep8248e_bcsr_node) {
 266                 printk(KERN_ERR "No bcsr in device tree\n");
 267                 return;
 268         }
 269
 270         ep8248e_bcsr = of_iomap(ep8248e_bcsr_node, 0);
 271         if (!ep8248e_bcsr) {
 272                 printk(KERN_ERR "Cannot map BCSR registers\n");
 273                 of_node_put(ep8248e_bcsr_node);
 274                 ep8248e_bcsr_node = NULL;
 275                 return;
 276         }
 277
 278         setbits8(&ep8248e_bcsr[7], BCSR7_SCC2_ENABLE);
 279         setbits8(&ep8248e_bcsr[8], BCSR8_PHY1_ENABLE | BCSR8_PHY1_POWER |
 280                                    BCSR8_PHY2_ENABLE | BCSR8_PHY2_POWER);
 281
 282         init_ioports();
 283
 284         if (ppc_md.progress)
 285                 ppc_md.progress("ep8248e_setup_arch(), finish", 0);
 286 }
 287
 288 static const struct of_device_id of_bus_ids[] __initconst = {
 289         { .compatible = "simple-bus", },
 290         { .compatible = "fsl,ep8248e-bcsr", },
 291         {},
 292 };
 293
 294 static int __init declare_of_platform_devices(void)
 295 {
 296         of_platform_bus_probe(NULL, of_bus_ids, NULL);
 297
 298         if (IS_ENABLED(CONFIG_MDIO_BITBANG))
 299                 platform_driver_register(&ep8248e_mdio_driver);
 300
 301         return 0;
 302 }
 303 machine_device_initcall(ep8248e, declare_of_platform_devices);
 304
 305 /*
 306  * Called very early, device-tree isn't unflattened
 307  */
 308 static int __init ep8248e_probe(void)
 309 {
 310         return of_machine_is_compatible("fsl,ep8248e");
 311 }
 312
 313 define_machine(ep8248e)
 314 {
 315         .name = "Embedded Planet EP8248E",
 316         .probe = ep8248e_probe,
 317         .setup_arch = ep8248e_setup_arch,
 318         .init_IRQ = ep8248e_pic_init,
 319         .get_irq = cpm2_get_irq,
 320         .calibrate_decr = generic_calibrate_decr,
 321         .restart = pq2_restart,
 322         .progress = udbg_progress,
 323 };