rockchip/rk*: replace UART special snowflake with standard driver

The standard uart8250mem_32 driver is now usable on ARM, so use it.

BUG=none
BRANCH=none
TEST=see that serial firmware builds still log on serial in all stages
on veyron_minnie. Also verified that a 9600 baud console is functional.

Change-Id: I653b70a0d51a8d136e1da17537988f5b33c7a160
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: fa27c60fd38002775072d11fca431d4788b4d1d7
Original-Change-Id: I047d74ac2d5c311f303955e62391114e16ec087a
Original-Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/337551
Original-Commit-Ready: Patrick Georgi <pgeorgi@chromium.org>
Original-Tested-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://review.coreboot.org/14319
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

3 files changed, 6 insertions, 142 deletions

diff --git a/src/soc/rockchip/common/uart.c b/src/soc/rockchip/common/uart.c
index 5e1f8ef467..d2115da5e8 100644
--- a/src/soc/rockchip/common/uart.c
+++ b/src/soc/rockchip/common/uart.c
@@ -13,151 +13,15 @@
  * GNU General Public License for more details.
  */
 
-#include <arch/io.h>
-#include <boot/coreboot_tables.h>
-#include <console/console.h>	/* for __console definition */
 #include <console/uart.h>
-#include <drivers/uart/uart8250reg.h>
 #include <stdint.h>
 
-/*
- * TODO: Use DRIVERS_UART_8250MEM driver instead.
- * There is an issue in the IO call functions where x86 and ARM
- * ordering is reversed. This 8250MEM driver uses the x86 convention.
- * This driver can be replaced once the IO calls are sorted.
- */
-
-struct rk_uart {
-	union {
-		uint32_t thr; /* Transmit holding register. */
-		uint32_t rbr; /* Receive buffer register. */
-		uint32_t dll; /* Divisor latch lsb. */
-	};
-	union {
-		uint32_t ier; /* Interrupt enable register. */
-		uint32_t dlm; /* Divisor latch msb. */
-	};
-	union {
-		uint32_t iir; /* Interrupt identification register. */
-		uint32_t fcr; /* FIFO control register. */
-	};
-	uint32_t lcr; /* Line control register. */
-	uint32_t mcr; /* Modem control register. */
-	uint32_t lsr; /* Line status register. */
-	uint32_t msr; /* Modem status register. */
-	uint32_t scr;
-	uint32_t reserved1[(0x30 - 0x20) / 4];
-	uint32_t srbr[(0x70 - 0x30) / 4];
-	uint32_t far;
-	uint32_t tfr;
-	uint32_t rfw;
-	uint32_t usr;
-	uint32_t tfl;
-	uint32_t rfl;
-	uint32_t srr;
-	uint32_t srts;
-	uint32_t sbcr;
-	uint32_t sdmam;
-	uint32_t sfe;
-	uint32_t srt;
-	uint32_t stet;
-	uint32_t htx;
-	uint32_t dmasa;
-	uint32_t reserver2[(0xf4 - 0xac) / 4];
-	uint32_t cpr;
-	uint32_t ucv;
-	uint32_t ctr;
-} __attribute__ ((packed));
-
-
-static struct rk_uart * const uart_ptr =
-	(void *)CONFIG_CONSOLE_SERIAL_UART_ADDRESS;
-
-static void rk_uart_tx_flush(void);
-static int rk_uart_tst_byte(void);
-
-static void rk_uart_init(void)
-{
-	/* FIXME: Use a hardcoded divisor for now.
-	 * uint16_t divisor = (u16) uart_baudrate_divisor(default_baudrate(),
-	 *	uart_platform_refclk(), 16)
-	 */
-	const unsigned divisor = 13;
-	const uint8_t line_config = UART8250_LCR_WLS_8; // 8n1
-
-	rk_uart_tx_flush();
-
-	// Disable interrupts.
-	write32(&uart_ptr->ier, 0);
-	// Force DTR and RTS to high.
-	write32(&uart_ptr->mcr, UART8250_MCR_DTR | UART8250_MCR_RTS);
-	// Set line configuration, access divisor latches.
-	write32(&uart_ptr->lcr, UART8250_LCR_DLAB | line_config);
-	// Set the divisor.
-	write32(&uart_ptr->dll, divisor & 0xff);
-	write32(&uart_ptr->dlm, (divisor >> 8) & 0xff);
-	// Hide the divisor latches.
-	write32(&uart_ptr->lcr, line_config);
-	// Enable FIFOs, and clear receive and transmit.
-	write32(&uart_ptr->fcr, UART8250_FCR_FIFO_EN |
-		UART8250_FCR_CLEAR_RCVR | UART8250_FCR_CLEAR_XMIT);
-}
-
-static void rk_uart_tx_byte(unsigned char data)
-{
-	while (!(read32(&uart_ptr->lsr) & UART8250_LSR_THRE));
-	write32(&uart_ptr->thr, data);
-}
-
-static void rk_uart_tx_flush(void)
-{
-	while (!(read32(&uart_ptr->lsr) & UART8250_LSR_TEMT));
-}
-
-static unsigned char rk_uart_rx_byte(void)
+unsigned int uart_platform_refclk(void)
 {
-	if (!rk_uart_tst_byte())
-		return 0;
-	return read32(&uart_ptr->rbr);
+	return 23040000;
 }
 
-static int rk_uart_tst_byte(void)
+uintptr_t uart_platform_base(int idx)
 {
-	return (read32(&uart_ptr->lsr) & UART8250_LSR_DR) == UART8250_LSR_DR;
-}
-
-
-
-void uart_init(int idx)
-{
-	rk_uart_init();
-}
-
-unsigned char uart_rx_byte(int idx)
-{
-	return rk_uart_rx_byte();
-}
-
-void uart_tx_byte(int idx, unsigned char data)
-{
-	rk_uart_tx_byte(data);
-}
-
-void uart_tx_flush(int idx)
-{
-	rk_uart_tx_flush();
-}
-
-#ifndef __PRE_RAM__
-void uart_fill_lb(void *data)
-{
-	struct lb_serial serial;
-	serial.type = LB_SERIAL_TYPE_MEMORY_MAPPED;
-	serial.baseaddr = CONFIG_CONSOLE_SERIAL_UART_ADDRESS;
-	serial.baud = default_baudrate();
-	serial.regwidth = 4;
-	lb_add_serial(&serial, data);
-
-	lb_add_console(LB_TAG_CONSOLE_SERIAL8250MEM, data);
+	return CONFIG_CONSOLE_SERIAL_UART_ADDRESS;
 }
-#endif
diff --git a/src/soc/rockchip/rk3288/Kconfig b/src/soc/rockchip/rk3288/Kconfig
index 0f39f75be2..8b15d3dc45 100644
--- a/src/soc/rockchip/rk3288/Kconfig
+++ b/src/soc/rockchip/rk3288/Kconfig
@@ -20,9 +20,9 @@ config SOC_ROCKCHIP_RK3288
 	select ARCH_VERSTAGE_ARMV7
 	select ARCH_ROMSTAGE_ARMV7
 	select ARCH_RAMSTAGE_ARMV7
+	select DRIVERS_UART_8250MEM_32
 	select HAVE_MONOTONIC_TIMER
 	select GENERIC_UDELAY
-	select HAVE_UART_SPECIAL
 	select BOOTBLOCK_CONSOLE
 	select UNCOMPRESSED_RAMSTAGE
 	select GENERIC_GPIO_LIB
diff --git a/src/soc/rockchip/rk3399/Kconfig b/src/soc/rockchip/rk3399/Kconfig
index 0c1f258ded..283f6c2c9e 100644
--- a/src/soc/rockchip/rk3399/Kconfig
+++ b/src/soc/rockchip/rk3399/Kconfig
@@ -7,9 +7,9 @@ config SOC_ROCKCHIP_RK3399
 	select ARCH_VERSTAGE_ARMV8_64
 	select ARM64_A53_ERRATUM_843419
 	select BOOTBLOCK_CONSOLE
+	select DRIVERS_UART_8250MEM_32
 	select GENERIC_UDELAY
 	select HAVE_MONOTONIC_TIMER
-	select HAVE_UART_SPECIAL
 	select UNCOMPRESSED_RAMSTAGE
 
 if SOC_ROCKCHIP_RK3399