drivers/usb/gadget/mv_udc_phy.c

   1 #include <linux/delay.h>
   2 #include <linux/timer.h>
   3 #include <linux/io.h>
   4 #include <linux/errno.h>
   5
   6 #include <mach/cputype.h>
   7
   8 #ifdef CONFIG_ARCH_MMP
   9
  10 #define UTMI_REVISION           0x0
  11 #define UTMI_CTRL               0x4
  12 #define UTMI_PLL                0x8
  13 #define UTMI_TX                 0xc
  14 #define UTMI_RX                 0x10
  15 #define UTMI_IVREF              0x14
  16 #define UTMI_T0                 0x18
  17 #define UTMI_T1                 0x1c
  18 #define UTMI_T2                 0x20
  19 #define UTMI_T3                 0x24
  20 #define UTMI_T4                 0x28
  21 #define UTMI_T5                 0x2c
  22 #define UTMI_RESERVE            0x30
  23 #define UTMI_USB_INT            0x34
  24 #define UTMI_DBG_CTL            0x38
  25 #define UTMI_OTG_ADDON          0x3c
  26
  27 /* For UTMICTRL Register */
  28 #define UTMI_CTRL_USB_CLK_EN                    (1 << 31)
  29 /* pxa168 */
  30 #define UTMI_CTRL_SUSPEND_SET1                  (1 << 30)
  31 #define UTMI_CTRL_SUSPEND_SET2                  (1 << 29)
  32 #define UTMI_CTRL_RXBUF_PDWN                    (1 << 24)
  33 #define UTMI_CTRL_TXBUF_PDWN                    (1 << 11)
  34
  35 #define UTMI_CTRL_INPKT_DELAY_SHIFT             30
  36 #define UTMI_CTRL_INPKT_DELAY_SOF_SHIFT         28
  37 #define UTMI_CTRL_PU_REF_SHIFT                  20
  38 #define UTMI_CTRL_ARC_PULLDN_SHIFT              12
  39 #define UTMI_CTRL_PLL_PWR_UP_SHIFT              1
  40 #define UTMI_CTRL_PWR_UP_SHIFT                  0
  41 /* For UTMI_PLL Register */
  42 #define UTMI_PLL_CLK_BLK_EN_SHIFT               24
  43 #define UTMI_PLL_FBDIV_SHIFT                    4
  44 #define UTMI_PLL_REFDIV_SHIFT                   0
  45 #define UTMI_PLL_FBDIV_MASK                     0x00000FF0
  46 #define UTMI_PLL_REFDIV_MASK                    0x0000000F
  47 #define UTMI_PLL_ICP_MASK                       0x00007000
  48 #define UTMI_PLL_KVCO_MASK                      0x00031000
  49 #define UTMI_PLL_PLLCALI12_SHIFT                29
  50 #define UTMI_PLL_PLLCALI12_MASK                 (0x3 << 29)
  51 #define UTMI_PLL_PLLVDD18_SHIFT                 27
  52 #define UTMI_PLL_PLLVDD18_MASK                  (0x3 << 27)
  53 #define UTMI_PLL_PLLVDD12_SHIFT                 25
  54 #define UTMI_PLL_PLLVDD12_MASK                  (0x3 << 25)
  55 #define UTMI_PLL_KVCO_SHIFT                     15
  56 #define UTMI_PLL_ICP_SHIFT                      12
  57 /* For UTMI_TX Register */
  58 #define UTMI_TX_REG_EXT_FS_RCAL_SHIFT           27
  59 #define UTMI_TX_REG_EXT_FS_RCAL_MASK            (0xf << 27)
  60 #define UTMI_TX_REG_EXT_FS_RCAL_EN_MASK         26
  61 #define UTMI_TX_REG_EXT_FS_RCAL_EN              (0x1 << 26)
  62 #define UTMI_TX_LOW_VDD_EN_SHIFT                11
  63 #define UTMI_TX_IMPCAL_VTH_SHIFT                14
  64 #define UTMI_TX_IMPCAL_VTH_MASK                 (0x7 << 14)
  65 #define UTMI_TX_CK60_PHSEL_SHIFT                17
  66 #define UTMI_TX_CK60_PHSEL_MASK                 (0xf << 17)
  67 #define UTMI_TX_TXVDD12_SHIFT                   22
  68 #define UTMI_TX_TXVDD12_MASK                    (0x3 << 22)
  69 #define UTMI_TX_AMP_SHIFT                       0
  70 #define UTMI_TX_AMP_MASK                        (0x7 << 0)
  71 /* For UTMI_RX Register */
  72 #define UTMI_RX_SQ_THRESH_SHIFT                 4
  73 #define UTMI_RX_SQ_THRESH_MASK                  (0xf << 4)
  74 #define UTMI_REG_SQ_LENGTH_SHIFT                15
  75 #define UTMI_REG_SQ_LENGTH_MASK                 (0x3 << 15)
  76
  77 #define REG_RCAL_START                          0x00001000
  78 #define VCOCAL_START                            0x00200000
  79 #define KVCO_EXT                                0x00400000
  80 #define PLL_READY                               0x00800000
  81 #define CLK_BLK_EN                              0x01000000
  82 #endif
  83
  84 static unsigned int u2o_read(unsigned int base, unsigned int offset)
  85 {
  86         return readl(base + offset);
  87 }
  88
  89 static void u2o_set(unsigned int base, unsigned int offset, unsigned int value)
  90 {
  91         unsigned int reg;
  92
  93         reg = readl(base + offset);
  94         reg |= value;
  95         writel(reg, base + offset);
  96         readl(base + offset);
  97 }
  98
  99 static void u2o_clear(unsigned int base, unsigned int offset,
 100         unsigned int value)
 101 {
 102         unsigned int reg;
 103
 104         reg = readl(base + offset);
 105         reg &= ~value;
 106         writel(reg, base + offset);
 107         readl(base + offset);
 108 }
 109
 110 static void u2o_write(unsigned int base, unsigned int offset,
 111         unsigned int value)
 112 {
 113         writel(value, base + offset);
 114         readl(base + offset);
 115 }
 116
 117 #ifdef CONFIG_ARCH_MMP
 118 int mv_udc_phy_init(unsigned int base)
 119 {
 120         unsigned long timeout;
 121
 122         /* Initialize the USB PHY power */
 123         if (cpu_is_pxa910()) {
 124                 u2o_set(base, UTMI_CTRL, (1 << UTMI_CTRL_INPKT_DELAY_SOF_SHIFT)
 125                         | (1 << UTMI_CTRL_PU_REF_SHIFT));
 126         }
 127
 128         u2o_set(base, UTMI_CTRL, 1 << UTMI_CTRL_PLL_PWR_UP_SHIFT);
 129         u2o_set(base, UTMI_CTRL, 1 << UTMI_CTRL_PWR_UP_SHIFT);
 130
 131         /* UTMI_PLL settings */
 132         u2o_clear(base, UTMI_PLL, UTMI_PLL_PLLVDD18_MASK
 133                 | UTMI_PLL_PLLVDD12_MASK | UTMI_PLL_PLLCALI12_MASK
 134                 | UTMI_PLL_FBDIV_MASK | UTMI_PLL_REFDIV_MASK
 135                 | UTMI_PLL_ICP_MASK | UTMI_PLL_KVCO_MASK);
 136
 137         u2o_set(base, UTMI_PLL, (0xee << UTMI_PLL_FBDIV_SHIFT)
 138                 | (0xb << UTMI_PLL_REFDIV_SHIFT)
 139                 | (3 << UTMI_PLL_PLLVDD18_SHIFT)
 140                 | (3 << UTMI_PLL_PLLVDD12_SHIFT)
 141                 | (3 << UTMI_PLL_PLLCALI12_SHIFT)
 142                 | (1 << UTMI_PLL_ICP_SHIFT) | (3 << UTMI_PLL_KVCO_SHIFT));
 143
 144         /* UTMI_TX */
 145         u2o_clear(base, UTMI_TX, UTMI_TX_REG_EXT_FS_RCAL_EN_MASK
 146                 | UTMI_TX_TXVDD12_MASK
 147                 | UTMI_TX_CK60_PHSEL_MASK | UTMI_TX_IMPCAL_VTH_MASK
 148                 | UTMI_TX_REG_EXT_FS_RCAL_MASK | UTMI_TX_AMP_MASK);
 149         u2o_set(base, UTMI_TX, (3 << UTMI_TX_TXVDD12_SHIFT)
 150                 | (4 << UTMI_TX_CK60_PHSEL_SHIFT)
 151                 | (4 << UTMI_TX_IMPCAL_VTH_SHIFT)
 152                 | (8 << UTMI_TX_REG_EXT_FS_RCAL_SHIFT)
 153                 | (3 << UTMI_TX_AMP_SHIFT));
 154
 155         /* UTMI_RX */
 156         u2o_clear(base, UTMI_RX, UTMI_RX_SQ_THRESH_MASK
 157                 | UTMI_REG_SQ_LENGTH_MASK);
 158         if (cpu_is_pxa168())
 159                 u2o_set(base, UTMI_RX, (7 << UTMI_RX_SQ_THRESH_SHIFT)
 160                         | (2 << UTMI_REG_SQ_LENGTH_SHIFT));
 161         else
 162                 u2o_set(base, UTMI_RX, (0x7 << UTMI_RX_SQ_THRESH_SHIFT)
 163                         | (2 << UTMI_REG_SQ_LENGTH_SHIFT));
 164
 165         /* UTMI_IVREF */
 166         if (cpu_is_pxa168())
 167                 /*
 168                  * fixing Microsoft Altair board interface with NEC hub issue -
 169                  * Set UTMI_IVREF from 0x4a3 to 0x4bf
 170                  */
 171                 u2o_write(base, UTMI_IVREF, 0x4bf);
 172
 173         /* calibrate */
 174         timeout = jiffies + 100;
 175         while ((u2o_read(base, UTMI_PLL) & PLL_READY) == 0) {
 176                 if (time_after(jiffies, timeout))
 177                         return -ETIME;
 178                 cpu_relax();
 179         }
 180
 181         /* toggle VCOCAL_START bit of UTMI_PLL */
 182         udelay(200);
 183         u2o_set(base, UTMI_PLL, VCOCAL_START);
 184         udelay(40);
 185         u2o_clear(base, UTMI_PLL, VCOCAL_START);
 186
 187         /* toggle REG_RCAL_START bit of UTMI_TX */
 188         udelay(200);
 189         u2o_set(base, UTMI_TX, REG_RCAL_START);
 190         udelay(40);
 191         u2o_clear(base, UTMI_TX, REG_RCAL_START);
 192         udelay(200);
 193
 194         /* make sure phy is ready */
 195         timeout = jiffies + 100;
 196         while ((u2o_read(base, UTMI_PLL) & PLL_READY) == 0) {
 197                 if (time_after(jiffies, timeout))
 198                         return -ETIME;
 199                 cpu_relax();
 200         }
 201
 202         if (cpu_is_pxa168()) {
 203                 u2o_set(base, UTMI_RESERVE, 1 << 5);
 204                 /* Turn on UTMI PHY OTG extension */
 205                 u2o_write(base, UTMI_OTG_ADDON, 1);
 206         }
 207         return 0;
 208 }
 209 #else
 210 int mv_udc_phy_init(unsigned int base)
 211 {
 212         return 0;
 213 }
 214 #endif