drivers/ssb/driver_extif.c

   1 /*
   2  * Sonics Silicon Backplane
   3  * Broadcom EXTIF core driver
   4  *
   5  * Copyright 2005, Broadcom Corporation
   6  * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
   7  * Copyright 2006, 2007, Felix Fietkau <nbd@openwrt.org>
   8  * Copyright 2007, Aurelien Jarno <aurelien@aurel32.net>
   9  *
  10  * Licensed under the GNU/GPL. See COPYING for details.
  11  */
  12
  13 #include <linux/serial.h>
  14 #include <linux/serial_core.h>
  15 #include <linux/serial_reg.h>
  16
  17 #include "ssb_private.h"
  18
  19
  20 static inline u32 extif_read32(struct ssb_extif *extif, u16 offset)
  21 {
  22         return ssb_read32(extif->dev, offset);
  23 }
  24
  25 static inline void extif_write32(struct ssb_extif *extif, u16 offset, u32 value)
  26 {
  27         ssb_write32(extif->dev, offset, value);
  28 }
  29
  30 static inline u32 extif_write32_masked(struct ssb_extif *extif, u16 offset,
  31                                        u32 mask, u32 value)
  32 {
  33         value &= mask;
  34         value |= extif_read32(extif, offset) & ~mask;
  35         extif_write32(extif, offset, value);
  36
  37         return value;
  38 }
  39
  40 #ifdef CONFIG_SSB_SERIAL
  41 static bool serial_exists(u8 *regs)
  42 {
  43         u8 save_mcr, msr = 0;
  44
  45         if (regs) {
  46                 save_mcr = regs[UART_MCR];
  47                 regs[UART_MCR] = (UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_RTS);
  48                 msr = regs[UART_MSR] & (UART_MSR_DCD | UART_MSR_RI
  49                                         | UART_MSR_CTS | UART_MSR_DSR);
  50                 regs[UART_MCR] = save_mcr;
  51         }
  52         return (msr == (UART_MSR_DCD | UART_MSR_CTS));
  53 }
  54
  55 int ssb_extif_serial_init(struct ssb_extif *extif, struct ssb_serial_port *ports)
  56 {
  57         u32 i, nr_ports = 0;
  58
  59         /* Disable GPIO interrupt initially */
  60         extif_write32(extif, SSB_EXTIF_GPIO_INTPOL, 0);
  61         extif_write32(extif, SSB_EXTIF_GPIO_INTMASK, 0);
  62
  63         for (i = 0; i < 2; i++) {
  64                 void __iomem *uart_regs;
  65
  66                 uart_regs = ioremap_nocache(SSB_EUART, 16);
  67                 if (uart_regs) {
  68                         uart_regs += (i * 8);
  69
  70                         if (serial_exists(uart_regs) && ports) {
  71                                 extif_write32(extif, SSB_EXTIF_GPIO_INTMASK, 2);
  72
  73                                 nr_ports++;
  74                                 ports[i].regs = uart_regs;
  75                                 ports[i].irq = 2;
  76                                 ports[i].baud_base = 13500000;
  77                                 ports[i].reg_shift = 0;
  78                         }
  79                         iounmap(uart_regs);
  80                 }
  81         }
  82         return nr_ports;
  83 }
  84 #endif /* CONFIG_SSB_SERIAL */
  85
  86 void ssb_extif_timing_init(struct ssb_extif *extif, unsigned long ns)
  87 {
  88         u32 tmp;
  89
  90         /* Initialize extif so we can get to the LEDs and external UART */
  91         extif_write32(extif, SSB_EXTIF_PROG_CFG, SSB_EXTCFG_EN);
  92
  93         /* Set timing for the flash */
  94         tmp  = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;
  95         tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT;
  96         tmp |= DIV_ROUND_UP(120, ns);
  97         extif_write32(extif, SSB_EXTIF_PROG_WAITCNT, tmp);
  98
  99         /* Set programmable interface timing for external uart */
 100         tmp  = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;
 101         tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT;
 102         tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT;
 103         tmp |= DIV_ROUND_UP(120, ns);
 104         extif_write32(extif, SSB_EXTIF_PROG_WAITCNT, tmp);
 105 }
 106
 107 void ssb_extif_get_clockcontrol(struct ssb_extif *extif,
 108                                 u32 *pll_type, u32 *n, u32 *m)
 109 {
 110         *pll_type = SSB_PLLTYPE_1;
 111         *n = extif_read32(extif, SSB_EXTIF_CLOCK_N);
 112         *m = extif_read32(extif, SSB_EXTIF_CLOCK_SB);
 113 }
 114
 115 void ssb_extif_watchdog_timer_set(struct ssb_extif *extif,
 116                                   u32 ticks)
 117 {
 118         extif_write32(extif, SSB_EXTIF_WATCHDOG, ticks);
 119 }
 120
 121 u32 ssb_extif_gpio_in(struct ssb_extif *extif, u32 mask)
 122 {
 123         return extif_read32(extif, SSB_EXTIF_GPIO_IN) & mask;
 124 }
 125
 126 u32 ssb_extif_gpio_out(struct ssb_extif *extif, u32 mask, u32 value)
 127 {
 128         return extif_write32_masked(extif, SSB_EXTIF_GPIO_OUT(0),
 129                                    mask, value);
 130 }
 131
 132 u32 ssb_extif_gpio_outen(struct ssb_extif *extif, u32 mask, u32 value)
 133 {
 134         return extif_write32_masked(extif, SSB_EXTIF_GPIO_OUTEN(0),
 135                                    mask, value);
 136 }
 137
 138 u32 ssb_extif_gpio_polarity(struct ssb_extif *extif, u32 mask, u32 value)
 139 {
 140         return extif_write32_masked(extif, SSB_EXTIF_GPIO_INTPOL, mask, value);
 141 }
 142
 143 u32 ssb_extif_gpio_intmask(struct ssb_extif *extif, u32 mask, u32 value)
 144 {
 145         return extif_write32_masked(extif, SSB_EXTIF_GPIO_INTMASK, mask, value);
 146 }