arch/mips/momentum/ocelot_3/platform.c

   1 #include <linux/delay.h>
   2 #include <linux/if_ether.h>
   3 #include <linux/ioport.h>
   4 #include <linux/mv643xx.h>
   5 #include <linux/platform_device.h>
   6
   7 #include "ocelot_3_fpga.h"
   8
   9 #if defined(CONFIG_MV643XX_ETH) || defined(CONFIG_MV643XX_ETH_MODULE)
  10
  11 static struct resource mv643xx_eth_shared_resources[] = {
  12         [0] = {
  13                 .name   = "ethernet shared base",
  14                 .start  = 0xf1000000 + MV643XX_ETH_SHARED_REGS,
  15                 .end    = 0xf1000000 + MV643XX_ETH_SHARED_REGS +
  16                                        MV643XX_ETH_SHARED_REGS_SIZE - 1,
  17                 .flags  = IORESOURCE_MEM,
  18         },
  19 };
  20
  21 static struct platform_device mv643xx_eth_shared_device = {
  22         .name           = MV643XX_ETH_SHARED_NAME,
  23         .id             = 0,
  24         .num_resources  = ARRAY_SIZE(mv643xx_eth_shared_resources),
  25         .resource       = mv643xx_eth_shared_resources,
  26 };
  27
  28 #define MV_SRAM_BASE                    0xfe000000UL
  29 #define MV_SRAM_SIZE                    (256 * 1024)
  30
  31 #define MV_SRAM_RXRING_SIZE             (MV_SRAM_SIZE / 4)
  32 #define MV_SRAM_TXRING_SIZE             (MV_SRAM_SIZE / 4)
  33
  34 #define MV_SRAM_BASE_ETH0               MV_SRAM_BASE
  35 #define MV_SRAM_BASE_ETH1               (MV_SRAM_BASE + (MV_SRAM_SIZE / 2))
  36
  37 #define MV64x60_IRQ_ETH_0 48
  38 #define MV64x60_IRQ_ETH_1 49
  39 #define MV64x60_IRQ_ETH_2 50
  40
  41 static struct resource mv64x60_eth0_resources[] = {
  42         [0] = {
  43                 .name   = "eth0 irq",
  44                 .start  = MV64x60_IRQ_ETH_0,
  45                 .end    = MV64x60_IRQ_ETH_0,
  46                 .flags  = IORESOURCE_IRQ,
  47         },
  48 };
  49
  50 static struct mv643xx_eth_platform_data eth0_pd = {
  51         .port_number    = 0,
  52
  53         .tx_sram_addr   = MV_SRAM_BASE_ETH0,
  54         .tx_sram_size   = MV_SRAM_TXRING_SIZE,
  55         .tx_queue_size  = MV_SRAM_TXRING_SIZE / 16,
  56
  57         .rx_sram_addr   = MV_SRAM_BASE_ETH0 + MV_SRAM_TXRING_SIZE,
  58         .rx_sram_size   = MV_SRAM_RXRING_SIZE,
  59         .rx_queue_size  = MV_SRAM_RXRING_SIZE / 16,
  60 };
  61
  62 static struct platform_device eth0_device = {
  63         .name           = MV643XX_ETH_NAME,
  64         .id             = 0,
  65         .num_resources  = ARRAY_SIZE(mv64x60_eth0_resources),
  66         .resource       = mv64x60_eth0_resources,
  67         .dev = {
  68                 .platform_data = &eth0_pd,
  69         },
  70 };
  71
  72 static struct resource mv64x60_eth1_resources[] = {
  73         [0] = {
  74                 .name   = "eth1 irq",
  75                 .start  = MV64x60_IRQ_ETH_1,
  76                 .end    = MV64x60_IRQ_ETH_1,
  77                 .flags  = IORESOURCE_IRQ,
  78         },
  79 };
  80
  81 static struct mv643xx_eth_platform_data eth1_pd = {
  82         .port_number    = 1,
  83
  84         .tx_sram_addr   = MV_SRAM_BASE_ETH1,
  85         .tx_sram_size   = MV_SRAM_TXRING_SIZE,
  86         .tx_queue_size  = MV_SRAM_TXRING_SIZE / 16,
  87
  88         .rx_sram_addr   = MV_SRAM_BASE_ETH1 + MV_SRAM_TXRING_SIZE,
  89         .rx_sram_size   = MV_SRAM_RXRING_SIZE,
  90         .rx_queue_size  = MV_SRAM_RXRING_SIZE / 16,
  91 };
  92
  93 static struct platform_device eth1_device = {
  94         .name           = MV643XX_ETH_NAME,
  95         .id             = 1,
  96         .num_resources  = ARRAY_SIZE(mv64x60_eth1_resources),
  97         .resource       = mv64x60_eth1_resources,
  98         .dev = {
  99                 .platform_data = &eth1_pd,
 100         },
 101 };
 102
 103 static struct resource mv64x60_eth2_resources[] = {
 104         [0] = {
 105                 .name   = "eth2 irq",
 106                 .start  = MV64x60_IRQ_ETH_2,
 107                 .end    = MV64x60_IRQ_ETH_2,
 108                 .flags  = IORESOURCE_IRQ,
 109         },
 110 };
 111
 112 static struct mv643xx_eth_platform_data eth2_pd = {
 113         .port_number    = 2,
 114 };
 115
 116 static struct platform_device eth2_device = {
 117         .name           = MV643XX_ETH_NAME,
 118         .id             = 2,
 119         .num_resources  = ARRAY_SIZE(mv64x60_eth2_resources),
 120         .resource       = mv64x60_eth2_resources,
 121         .dev = {
 122                 .platform_data = &eth2_pd,
 123         },
 124 };
 125
 126 static struct platform_device *mv643xx_eth_pd_devs[] __initdata = {
 127         &mv643xx_eth_shared_device,
 128         &eth0_device,
 129         &eth1_device,
 130         &eth2_device,
 131 };
 132
 133 static u8 __init exchange_bit(u8 val, u8 cs)
 134 {
 135         /* place the data */
 136         OCELOT_FPGA_WRITE((val << 2) | cs, EEPROM_MODE);
 137         udelay(1);
 138
 139         /* turn the clock on */
 140         OCELOT_FPGA_WRITE((val << 2) | cs | 0x2, EEPROM_MODE);
 141         udelay(1);
 142
 143         /* turn the clock off and read-strobe */
 144         OCELOT_FPGA_WRITE((val << 2) | cs | 0x10, EEPROM_MODE);
 145
 146         /* return the data */
 147         return (OCELOT_FPGA_READ(EEPROM_MODE) >> 3) & 0x1;
 148 }
 149
 150 static void __init get_mac(char dest[6])
 151 {
 152         u8 read_opcode[12] = {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
 153         int i,j;
 154
 155         for (i = 0; i < 12; i++)
 156                 exchange_bit(read_opcode[i], 1);
 157
 158         for (j = 0; j < 6; j++) {
 159                 dest[j] = 0;
 160                 for (i = 0; i < 8; i++) {
 161                         dest[j] <<= 1;
 162                         dest[j] |= exchange_bit(0, 1);
 163                 }
 164         }
 165
 166         /* turn off CS */
 167         exchange_bit(0,0);
 168 }
 169
 170 /*
 171  * Copy and increment ethernet MAC address by a small value.
 172  *
 173  * This is useful for systems where the only one MAC address is stored in
 174  * non-volatile memory for multiple ports.
 175  */
 176 static inline void eth_mac_add(unsigned char *dst, unsigned char *src,
 177         unsigned int add)
 178 {
 179         int i;
 180
 181         BUG_ON(add >= 256);
 182
 183         for (i = ETH_ALEN; i >= 0; i--) {
 184                 dst[i] = src[i] + add;
 185                 add = dst[i] < src[i];          /* compute carry */
 186         }
 187
 188         WARN_ON(add);
 189 }
 190
 191 static int __init mv643xx_eth_add_pds(void)
 192 {
 193         unsigned char mac[ETH_ALEN];
 194         int ret;
 195
 196         get_mac(mac);
 197         eth_mac_add(eth0_pd.mac_addr, mac, 0);
 198         eth_mac_add(eth1_pd.mac_addr, mac, 1);
 199         eth_mac_add(eth2_pd.mac_addr, mac, 2);
 200         ret = platform_add_devices(mv643xx_eth_pd_devs,
 201                         ARRAY_SIZE(mv643xx_eth_pd_devs));
 202
 203         return ret;
 204 }
 205
 206 device_initcall(mv643xx_eth_add_pds);
 207
 208 #endif /* defined(CONFIG_MV643XX_ETH) || defined(CONFIG_MV643XX_ETH_MODULE) */