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 <mb@bu3sch.de>
   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 void 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
  38 #ifdef CONFIG_SSB_SERIAL
  39 static bool serial_exists(u8 *regs)
  40 {
  41         u8 save_mcr, msr = 0;
  42
  43         if (regs) {
  44                 save_mcr = regs[UART_MCR];
  45                 regs[UART_MCR] = (UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_RTS);
  46                 msr = regs[UART_MSR] & (UART_MSR_DCD | UART_MSR_RI
  47                                         | UART_MSR_CTS | UART_MSR_DSR);
  48                 regs[UART_MCR] = save_mcr;
  49         }
  50         return (msr == (UART_MSR_DCD | UART_MSR_CTS));
  51 }
  52
  53 int ssb_extif_serial_init(struct ssb_extif *extif, struct ssb_serial_port *ports)
  54 {
  55         u32 i, nr_ports = 0;
  56
  57         /* Disable GPIO interrupt initially */
  58         extif_write32(extif, SSB_EXTIF_GPIO_INTPOL, 0);
  59         extif_write32(extif, SSB_EXTIF_GPIO_INTMASK, 0);
  60
  61         for (i = 0; i < 2; i++) {
  62                 void __iomem *uart_regs;
  63
  64                 uart_regs = ioremap_nocache(SSB_EUART, 16);
  65                 if (uart_regs) {
  66                         uart_regs += (i * 8);
  67
  68                         if (serial_exists(uart_regs) && ports) {
  69                                 extif_write32(extif, SSB_EXTIF_GPIO_INTMASK, 2);
  70
  71                                 nr_ports++;
  72                                 ports[i].regs = uart_regs;
  73                                 ports[i].irq = 2;
  74                                 ports[i].baud_base = 13500000;
  75                                 ports[i].reg_shift = 0;
  76                         }
  77                         iounmap(uart_regs);
  78                 }
  79         }
  80         return nr_ports;
  81 }
  82 #endif /* CONFIG_SSB_SERIAL */
  83
  84 void ssb_extif_timing_init(struct ssb_extif *extif, unsigned long ns)
  85 {
  86         u32 tmp;
  87
  88         /* Initialize extif so we can get to the LEDs and external UART */
  89         extif_write32(extif, SSB_EXTIF_PROG_CFG, SSB_EXTCFG_EN);
  90
  91         /* Set timing for the flash */
  92         tmp  = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;
  93         tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT;
  94         tmp |= DIV_ROUND_UP(120, ns);
  95         extif_write32(extif, SSB_EXTIF_PROG_WAITCNT, tmp);
  96
  97         /* Set programmable interface timing for external uart */
  98         tmp  = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;
  99         tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT;
 100         tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT;
 101         tmp |= DIV_ROUND_UP(120, ns);
 102         extif_write32(extif, SSB_EXTIF_PROG_WAITCNT, tmp);
 103 }
 104
 105 void ssb_extif_get_clockcontrol(struct ssb_extif *extif,
 106                                 u32 *pll_type, u32 *n, u32 *m)
 107 {
 108         *pll_type = SSB_PLLTYPE_1;
 109         *n = extif_read32(extif, SSB_EXTIF_CLOCK_N);
 110         *m = extif_read32(extif, SSB_EXTIF_CLOCK_SB);
 111 }
 112
 113 u32 ssb_extif_gpio_in(struct ssb_extif *extif, u32 mask)
 114 {
 115         return extif_read32(extif, SSB_EXTIF_GPIO_IN) & mask;
 116 }
 117
 118 void ssb_extif_gpio_out(struct ssb_extif *extif, u32 mask, u32 value)
 119 {
 120         return extif_write32_masked(extif, SSB_EXTIF_GPIO_OUT(0),
 121                                    mask, value);
 122 }
 123
 124 void ssb_extif_gpio_outen(struct ssb_extif *extif, u32 mask, u32 value)
 125 {
 126         return extif_write32_masked(extif, SSB_EXTIF_GPIO_OUTEN(0),
 127                                    mask, value);
 128 }
 129