130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
/*
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* Sonics Silicon Backplane
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* Broadcom EXTIF core driver
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*
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* Copyright 2005, Broadcom Corporation
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* Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
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* Copyright 2006, 2007, Felix Fietkau <nbd@openwrt.org>
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* Copyright 2007, Aurelien Jarno <aurelien@aurel32.net>
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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#include <linux/serial.h>
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#include <linux/serial_core.h>
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#include <linux/serial_reg.h>
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#include "ssb_private.h"
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static inline u32 extif_read32(struct ssb_extif *extif, u16 offset)
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{
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return ssb_read32(extif->dev, offset);
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}
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static inline void extif_write32(struct ssb_extif *extif, u16 offset, u32 value)
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{
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ssb_write32(extif->dev, offset, value);
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}
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static inline void extif_write32_masked(struct ssb_extif *extif, u16 offset,
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u32 mask, u32 value)
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{
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value &= mask;
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value |= extif_read32(extif, offset) & ~mask;
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extif_write32(extif, offset, value);
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}
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#ifdef CONFIG_SSB_SERIAL
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static bool serial_exists(u8 *regs)
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{
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u8 save_mcr, msr = 0;
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if (regs) {
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save_mcr = regs[UART_MCR];
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regs[UART_MCR] = (UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_RTS);
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msr = regs[UART_MSR] & (UART_MSR_DCD | UART_MSR_RI
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| UART_MSR_CTS | UART_MSR_DSR);
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regs[UART_MCR] = save_mcr;
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}
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return (msr == (UART_MSR_DCD | UART_MSR_CTS));
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}
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int ssb_extif_serial_init(struct ssb_extif *extif, struct ssb_serial_port *ports)
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{
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u32 i, nr_ports = 0;
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/* Disable GPIO interrupt initially */
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extif_write32(extif, SSB_EXTIF_GPIO_INTPOL, 0);
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extif_write32(extif, SSB_EXTIF_GPIO_INTMASK, 0);
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for (i = 0; i < 2; i++) {
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void __iomem *uart_regs;
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uart_regs = ioremap_nocache(SSB_EUART, 16);
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if (uart_regs) {
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uart_regs += (i * 8);
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if (serial_exists(uart_regs) && ports) {
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extif_write32(extif, SSB_EXTIF_GPIO_INTMASK, 2);
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nr_ports++;
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ports[i].regs = uart_regs;
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ports[i].irq = 2;
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ports[i].baud_base = 13500000;
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ports[i].reg_shift = 0;
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}
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iounmap(uart_regs);
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}
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}
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return nr_ports;
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}
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#endif /* CONFIG_SSB_SERIAL */
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void ssb_extif_timing_init(struct ssb_extif *extif, unsigned long ns)
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{
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u32 tmp;
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/* Initialize extif so we can get to the LEDs and external UART */
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extif_write32(extif, SSB_EXTIF_PROG_CFG, SSB_EXTCFG_EN);
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/* Set timing for the flash */
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tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;
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tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT;
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tmp |= DIV_ROUND_UP(120, ns);
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extif_write32(extif, SSB_EXTIF_PROG_WAITCNT, tmp);
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/* Set programmable interface timing for external uart */
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tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;
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tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT;
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tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT;
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tmp |= DIV_ROUND_UP(120, ns);
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extif_write32(extif, SSB_EXTIF_PROG_WAITCNT, tmp);
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}
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void ssb_extif_get_clockcontrol(struct ssb_extif *extif,
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u32 *pll_type, u32 *n, u32 *m)
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{
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*pll_type = SSB_PLLTYPE_1;
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*n = extif_read32(extif, SSB_EXTIF_CLOCK_N);
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*m = extif_read32(extif, SSB_EXTIF_CLOCK_SB);
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}
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u32 ssb_extif_gpio_in(struct ssb_extif *extif, u32 mask)
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{
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return extif_read32(extif, SSB_EXTIF_GPIO_IN) & mask;
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}
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void ssb_extif_gpio_out(struct ssb_extif *extif, u32 mask, u32 value)
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{
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return extif_write32_masked(extif, SSB_EXTIF_GPIO_OUT(0),
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mask, value);
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}
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void ssb_extif_gpio_outen(struct ssb_extif *extif, u32 mask, u32 value)
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{
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return extif_write32_masked(extif, SSB_EXTIF_GPIO_OUTEN(0),
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mask, value);
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}
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