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481 lines
13 KiB
481 lines
13 KiB
/* |
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* COM1 NS16550 support |
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* originally from linux source (arch/powerpc/boot/ns16550.c) |
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* modified to use CONFIG_SYS_ISA_MEM and new defines |
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*/ |
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#include <common.h> |
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#include <clk.h> |
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#include <dm.h> |
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#include <errno.h> |
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#include <ns16550.h> |
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#include <reset.h> |
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#include <serial.h> |
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#include <watchdog.h> |
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#include <linux/types.h> |
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#include <asm/io.h> |
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DECLARE_GLOBAL_DATA_PTR; |
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#define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */ |
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#define UART_MCRVAL (UART_MCR_DTR | \ |
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UART_MCR_RTS) /* RTS/DTR */ |
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#ifndef CONFIG_DM_SERIAL |
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#ifdef CONFIG_SYS_NS16550_PORT_MAPPED |
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#define serial_out(x, y) outb(x, (ulong)y) |
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#define serial_in(y) inb((ulong)y) |
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#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0) |
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#define serial_out(x, y) out_be32(y, x) |
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#define serial_in(y) in_be32(y) |
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#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0) |
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#define serial_out(x, y) out_le32(y, x) |
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#define serial_in(y) in_le32(y) |
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#else |
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#define serial_out(x, y) writeb(x, y) |
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#define serial_in(y) readb(y) |
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#endif |
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#endif /* !CONFIG_DM_SERIAL */ |
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#if defined(CONFIG_SOC_KEYSTONE) |
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#define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0 |
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#define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) | (1 << 13) | (1 << 0)) |
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#undef UART_MCRVAL |
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#ifdef CONFIG_SERIAL_HW_FLOW_CONTROL |
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#define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE) |
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#else |
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#define UART_MCRVAL (UART_MCR_RTS) |
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#endif |
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#endif |
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#ifndef CONFIG_SYS_NS16550_IER |
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#define CONFIG_SYS_NS16550_IER 0x00 |
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#endif /* CONFIG_SYS_NS16550_IER */ |
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static inline void serial_out_shift(void *addr, int shift, int value) |
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{ |
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#ifdef CONFIG_SYS_NS16550_PORT_MAPPED |
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outb(value, (ulong)addr); |
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#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_LITTLE_ENDIAN) |
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out_le32(addr, value); |
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#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN) |
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out_be32(addr, value); |
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#elif defined(CONFIG_SYS_NS16550_MEM32) |
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writel(value, addr); |
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#elif defined(CONFIG_SYS_BIG_ENDIAN) |
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writeb(value, addr + (1 << shift) - 1); |
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#else |
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writeb(value, addr); |
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#endif |
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} |
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static inline int serial_in_shift(void *addr, int shift) |
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{ |
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#ifdef CONFIG_SYS_NS16550_PORT_MAPPED |
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return inb((ulong)addr); |
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#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_LITTLE_ENDIAN) |
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return in_le32(addr); |
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#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN) |
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return in_be32(addr); |
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#elif defined(CONFIG_SYS_NS16550_MEM32) |
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return readl(addr); |
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#elif defined(CONFIG_SYS_BIG_ENDIAN) |
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return readb(addr + (1 << shift) - 1); |
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#else |
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return readb(addr); |
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#endif |
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} |
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#ifdef CONFIG_DM_SERIAL |
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#ifndef CONFIG_SYS_NS16550_CLK |
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#define CONFIG_SYS_NS16550_CLK 0 |
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#endif |
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static void ns16550_writeb(NS16550_t port, int offset, int value) |
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{ |
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struct ns16550_platdata *plat = port->plat; |
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unsigned char *addr; |
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offset *= 1 << plat->reg_shift; |
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addr = (unsigned char *)plat->base + offset; |
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/* |
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* As far as we know it doesn't make sense to support selection of |
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* these options at run-time, so use the existing CONFIG options. |
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*/ |
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serial_out_shift(addr + plat->reg_offset, plat->reg_shift, value); |
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} |
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static int ns16550_readb(NS16550_t port, int offset) |
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{ |
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struct ns16550_platdata *plat = port->plat; |
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unsigned char *addr; |
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offset *= 1 << plat->reg_shift; |
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addr = (unsigned char *)plat->base + offset; |
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return serial_in_shift(addr + plat->reg_offset, plat->reg_shift); |
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} |
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static u32 ns16550_getfcr(NS16550_t port) |
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{ |
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struct ns16550_platdata *plat = port->plat; |
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return plat->fcr; |
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} |
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/* We can clean these up once everything is moved to driver model */ |
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#define serial_out(value, addr) \ |
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ns16550_writeb(com_port, \ |
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(unsigned char *)addr - (unsigned char *)com_port, value) |
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#define serial_in(addr) \ |
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ns16550_readb(com_port, \ |
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(unsigned char *)addr - (unsigned char *)com_port) |
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#else |
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static u32 ns16550_getfcr(NS16550_t port) |
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{ |
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return UART_FCR_DEFVAL; |
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} |
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#endif |
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int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate) |
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{ |
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const unsigned int mode_x_div = 16; |
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return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate); |
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} |
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static void NS16550_setbrg(NS16550_t com_port, int baud_divisor) |
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{ |
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serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); |
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serial_out(baud_divisor & 0xff, &com_port->dll); |
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serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); |
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serial_out(UART_LCRVAL, &com_port->lcr); |
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} |
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void NS16550_init(NS16550_t com_port, int baud_divisor) |
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{ |
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#if (defined(CONFIG_SPL_BUILD) && \ |
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(defined(CONFIG_OMAP34XX) || defined(CONFIG_OMAP44XX))) |
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/* |
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* On some OMAP3/OMAP4 devices when UART3 is configured for boot mode |
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* before SPL starts only THRE bit is set. We have to empty the |
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* transmitter before initialization starts. |
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*/ |
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if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE)) |
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== UART_LSR_THRE) { |
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if (baud_divisor != -1) |
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NS16550_setbrg(com_port, baud_divisor); |
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serial_out(0, &com_port->mdr1); |
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} |
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#endif |
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while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT)) |
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; |
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serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); |
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#if defined(CONFIG_ARCH_OMAP2PLUS) || defined(CONFIG_OMAP_SERIAL) |
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serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/ |
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#endif |
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serial_out(UART_MCRVAL, &com_port->mcr); |
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serial_out(ns16550_getfcr(com_port), &com_port->fcr); |
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if (baud_divisor != -1) |
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NS16550_setbrg(com_port, baud_divisor); |
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#if defined(CONFIG_ARCH_OMAP2PLUS) || defined(CONFIG_SOC_DA8XX) || \ |
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defined(CONFIG_OMAP_SERIAL) |
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/* /16 is proper to hit 115200 with 48MHz */ |
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serial_out(0, &com_port->mdr1); |
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#endif |
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#if defined(CONFIG_SOC_KEYSTONE) |
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serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC); |
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#endif |
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} |
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#ifndef CONFIG_NS16550_MIN_FUNCTIONS |
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void NS16550_reinit(NS16550_t com_port, int baud_divisor) |
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{ |
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serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); |
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NS16550_setbrg(com_port, 0); |
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serial_out(UART_MCRVAL, &com_port->mcr); |
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serial_out(ns16550_getfcr(com_port), &com_port->fcr); |
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NS16550_setbrg(com_port, baud_divisor); |
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} |
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#endif /* CONFIG_NS16550_MIN_FUNCTIONS */ |
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void NS16550_putc(NS16550_t com_port, char c) |
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{ |
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while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0) |
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; |
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serial_out(c, &com_port->thr); |
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/* |
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* Call watchdog_reset() upon newline. This is done here in putc |
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* since the environment code uses a single puts() to print the complete |
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* environment upon "printenv". So we can't put this watchdog call |
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* in puts(). |
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*/ |
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if (c == '\n') |
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WATCHDOG_RESET(); |
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} |
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#ifndef CONFIG_NS16550_MIN_FUNCTIONS |
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char NS16550_getc(NS16550_t com_port) |
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{ |
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while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) { |
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#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY) |
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extern void usbtty_poll(void); |
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usbtty_poll(); |
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#endif |
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WATCHDOG_RESET(); |
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} |
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return serial_in(&com_port->rbr); |
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} |
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int NS16550_tstc(NS16550_t com_port) |
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{ |
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return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0; |
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} |
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#endif /* CONFIG_NS16550_MIN_FUNCTIONS */ |
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#ifdef CONFIG_DEBUG_UART_NS16550 |
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#include <debug_uart.h> |
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static inline void _debug_uart_init(void) |
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{ |
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struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE; |
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int baud_divisor; |
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/* |
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* We copy the code from above because it is already horribly messy. |
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* Trying to refactor to nicely remove the duplication doesn't seem |
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* feasible. The better fix is to move all users of this driver to |
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* driver model. |
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*/ |
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baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK, |
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CONFIG_BAUDRATE); |
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serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER); |
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serial_dout(&com_port->mcr, UART_MCRVAL); |
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serial_dout(&com_port->fcr, UART_FCR_DEFVAL); |
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serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL); |
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serial_dout(&com_port->dll, baud_divisor & 0xff); |
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serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff); |
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serial_dout(&com_port->lcr, UART_LCRVAL); |
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} |
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static inline void _debug_uart_putc(int ch) |
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{ |
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struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE; |
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while (!(serial_din(&com_port->lsr) & UART_LSR_THRE)) |
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; |
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serial_dout(&com_port->thr, ch); |
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} |
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DEBUG_UART_FUNCS |
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#endif |
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#ifdef CONFIG_DM_SERIAL |
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static int ns16550_serial_putc(struct udevice *dev, const char ch) |
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{ |
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struct NS16550 *const com_port = dev_get_priv(dev); |
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if (!(serial_in(&com_port->lsr) & UART_LSR_THRE)) |
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return -EAGAIN; |
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serial_out(ch, &com_port->thr); |
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/* |
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* Call watchdog_reset() upon newline. This is done here in putc |
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* since the environment code uses a single puts() to print the complete |
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* environment upon "printenv". So we can't put this watchdog call |
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* in puts(). |
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*/ |
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if (ch == '\n') |
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WATCHDOG_RESET(); |
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return 0; |
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} |
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static int ns16550_serial_pending(struct udevice *dev, bool input) |
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{ |
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struct NS16550 *const com_port = dev_get_priv(dev); |
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if (input) |
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return (serial_in(&com_port->lsr) & UART_LSR_DR) ? 1 : 0; |
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else |
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return (serial_in(&com_port->lsr) & UART_LSR_THRE) ? 0 : 1; |
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} |
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static int ns16550_serial_getc(struct udevice *dev) |
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{ |
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struct NS16550 *const com_port = dev_get_priv(dev); |
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if (!(serial_in(&com_port->lsr) & UART_LSR_DR)) |
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return -EAGAIN; |
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return serial_in(&com_port->rbr); |
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} |
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static int ns16550_serial_setbrg(struct udevice *dev, int baudrate) |
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{ |
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struct NS16550 *const com_port = dev_get_priv(dev); |
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struct ns16550_platdata *plat = com_port->plat; |
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int clock_divisor; |
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clock_divisor = ns16550_calc_divisor(com_port, plat->clock, baudrate); |
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NS16550_setbrg(com_port, clock_divisor); |
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return 0; |
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} |
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int ns16550_serial_probe(struct udevice *dev) |
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{ |
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struct NS16550 *const com_port = dev_get_priv(dev); |
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struct reset_ctl_bulk reset_bulk; |
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int ret; |
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ret = reset_get_bulk(dev, &reset_bulk); |
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if (!ret) |
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reset_deassert_bulk(&reset_bulk); |
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com_port->plat = dev_get_platdata(dev); |
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NS16550_init(com_port, -1); |
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return 0; |
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} |
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#if CONFIG_IS_ENABLED(OF_CONTROL) |
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enum { |
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PORT_NS16550 = 0, |
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PORT_JZ4780, |
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}; |
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#endif |
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#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) |
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int ns16550_serial_ofdata_to_platdata(struct udevice *dev) |
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{ |
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struct ns16550_platdata *plat = dev->platdata; |
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const u32 port_type = dev_get_driver_data(dev); |
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fdt_addr_t addr; |
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struct clk clk; |
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int err; |
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/* try Processor Local Bus device first */ |
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addr = dev_read_addr(dev); |
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#if defined(CONFIG_PCI) && defined(CONFIG_DM_PCI) |
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if (addr == FDT_ADDR_T_NONE) { |
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/* then try pci device */ |
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struct fdt_pci_addr pci_addr; |
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u32 bar; |
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int ret; |
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/* we prefer to use a memory-mapped register */ |
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ret = fdtdec_get_pci_addr(gd->fdt_blob, dev_of_offset(dev), |
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FDT_PCI_SPACE_MEM32, "reg", |
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&pci_addr); |
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if (ret) { |
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/* try if there is any i/o-mapped register */ |
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ret = fdtdec_get_pci_addr(gd->fdt_blob, |
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dev_of_offset(dev), |
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FDT_PCI_SPACE_IO, |
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"reg", &pci_addr); |
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if (ret) |
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return ret; |
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} |
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ret = fdtdec_get_pci_bar32(dev, &pci_addr, &bar); |
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if (ret) |
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return ret; |
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addr = bar; |
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} |
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#endif |
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if (addr == FDT_ADDR_T_NONE) |
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return -EINVAL; |
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#ifdef CONFIG_SYS_NS16550_PORT_MAPPED |
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plat->base = addr; |
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#else |
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plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE); |
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#endif |
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plat->reg_offset = dev_read_u32_default(dev, "reg-offset", 0); |
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plat->reg_shift = dev_read_u32_default(dev, "reg-shift", 0); |
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err = clk_get_by_index(dev, 0, &clk); |
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if (!err) { |
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err = clk_get_rate(&clk); |
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if (!IS_ERR_VALUE(err)) |
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plat->clock = err; |
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} else if (err != -ENOENT && err != -ENODEV && err != -ENOSYS) { |
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debug("ns16550 failed to get clock\n"); |
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return err; |
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} |
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if (!plat->clock) |
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plat->clock = dev_read_u32_default(dev, "clock-frequency", |
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CONFIG_SYS_NS16550_CLK); |
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if (!plat->clock) { |
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debug("ns16550 clock not defined\n"); |
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return -EINVAL; |
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} |
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plat->fcr = UART_FCR_DEFVAL; |
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if (port_type == PORT_JZ4780) |
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plat->fcr |= UART_FCR_UME; |
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return 0; |
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} |
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#endif |
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const struct dm_serial_ops ns16550_serial_ops = { |
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.putc = ns16550_serial_putc, |
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.pending = ns16550_serial_pending, |
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.getc = ns16550_serial_getc, |
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.setbrg = ns16550_serial_setbrg, |
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}; |
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#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) |
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/* |
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* Please consider existing compatible strings before adding a new |
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* one to keep this table compact. Or you may add a generic "ns16550" |
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* compatible string to your dts. |
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*/ |
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static const struct udevice_id ns16550_serial_ids[] = { |
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{ .compatible = "ns16550", .data = PORT_NS16550 }, |
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{ .compatible = "ns16550a", .data = PORT_NS16550 }, |
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{ .compatible = "ingenic,jz4780-uart", .data = PORT_JZ4780 }, |
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{ .compatible = "nvidia,tegra20-uart", .data = PORT_NS16550 }, |
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{ .compatible = "snps,dw-apb-uart", .data = PORT_NS16550 }, |
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{} |
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}; |
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#endif /* OF_CONTROL && !OF_PLATDATA */ |
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#if CONFIG_IS_ENABLED(SERIAL_PRESENT) |
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/* TODO([email protected]): Integrate this into a macro like CONFIG_IS_ENABLED */ |
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#if !defined(CONFIG_TPL_BUILD) || defined(CONFIG_TPL_DM_SERIAL) |
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U_BOOT_DRIVER(ns16550_serial) = { |
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.name = "ns16550_serial", |
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.id = UCLASS_SERIAL, |
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#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) |
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.of_match = ns16550_serial_ids, |
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.ofdata_to_platdata = ns16550_serial_ofdata_to_platdata, |
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.platdata_auto_alloc_size = sizeof(struct ns16550_platdata), |
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#endif |
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.priv_auto_alloc_size = sizeof(struct NS16550), |
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.probe = ns16550_serial_probe, |
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.ops = &ns16550_serial_ops, |
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.flags = DM_FLAG_PRE_RELOC, |
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}; |
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#endif |
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#endif /* SERIAL_PRESENT */ |
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#endif /* CONFIG_DM_SERIAL */
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