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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /drivers/tty/serial/pch_uart.c
parentInitial commit. (diff)
downloadlinux-upstream/5.10.209.tar.xz
linux-upstream/5.10.209.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/tty/serial/pch_uart.c')
-rw-r--r--drivers/tty/serial/pch_uart.c1968
1 files changed, 1968 insertions, 0 deletions
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
new file mode 100644
index 000000000..cb68a1028
--- /dev/null
+++ b/drivers/tty/serial/pch_uart.c
@@ -0,0 +1,1968 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
+ */
+#include <linux/kernel.h>
+#include <linux/serial_reg.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/console.h>
+#include <linux/serial_core.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/dmi.h>
+#include <linux/nmi.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+
+#include <linux/debugfs.h>
+#include <linux/dmaengine.h>
+#include <linux/pch_dma.h>
+
+enum {
+ PCH_UART_HANDLED_RX_INT_SHIFT,
+ PCH_UART_HANDLED_TX_INT_SHIFT,
+ PCH_UART_HANDLED_RX_ERR_INT_SHIFT,
+ PCH_UART_HANDLED_RX_TRG_INT_SHIFT,
+ PCH_UART_HANDLED_MS_INT_SHIFT,
+ PCH_UART_HANDLED_LS_INT_SHIFT,
+};
+
+#define PCH_UART_DRIVER_DEVICE "ttyPCH"
+
+/* Set the max number of UART port
+ * Intel EG20T PCH: 4 port
+ * LAPIS Semiconductor ML7213 IOH: 3 port
+ * LAPIS Semiconductor ML7223 IOH: 2 port
+*/
+#define PCH_UART_NR 4
+
+#define PCH_UART_HANDLED_RX_INT (1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1))
+#define PCH_UART_HANDLED_TX_INT (1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1))
+#define PCH_UART_HANDLED_RX_ERR_INT (1<<((\
+ PCH_UART_HANDLED_RX_ERR_INT_SHIFT)<<1))
+#define PCH_UART_HANDLED_RX_TRG_INT (1<<((\
+ PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1))
+#define PCH_UART_HANDLED_MS_INT (1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1))
+
+#define PCH_UART_HANDLED_LS_INT (1<<((PCH_UART_HANDLED_LS_INT_SHIFT)<<1))
+
+#define PCH_UART_RBR 0x00
+#define PCH_UART_THR 0x00
+
+#define PCH_UART_IER_MASK (PCH_UART_IER_ERBFI|PCH_UART_IER_ETBEI|\
+ PCH_UART_IER_ELSI|PCH_UART_IER_EDSSI)
+#define PCH_UART_IER_ERBFI 0x00000001
+#define PCH_UART_IER_ETBEI 0x00000002
+#define PCH_UART_IER_ELSI 0x00000004
+#define PCH_UART_IER_EDSSI 0x00000008
+
+#define PCH_UART_IIR_IP 0x00000001
+#define PCH_UART_IIR_IID 0x00000006
+#define PCH_UART_IIR_MSI 0x00000000
+#define PCH_UART_IIR_TRI 0x00000002
+#define PCH_UART_IIR_RRI 0x00000004
+#define PCH_UART_IIR_REI 0x00000006
+#define PCH_UART_IIR_TOI 0x00000008
+#define PCH_UART_IIR_FIFO256 0x00000020
+#define PCH_UART_IIR_FIFO64 PCH_UART_IIR_FIFO256
+#define PCH_UART_IIR_FE 0x000000C0
+
+#define PCH_UART_FCR_FIFOE 0x00000001
+#define PCH_UART_FCR_RFR 0x00000002
+#define PCH_UART_FCR_TFR 0x00000004
+#define PCH_UART_FCR_DMS 0x00000008
+#define PCH_UART_FCR_FIFO256 0x00000020
+#define PCH_UART_FCR_RFTL 0x000000C0
+
+#define PCH_UART_FCR_RFTL1 0x00000000
+#define PCH_UART_FCR_RFTL64 0x00000040
+#define PCH_UART_FCR_RFTL128 0x00000080
+#define PCH_UART_FCR_RFTL224 0x000000C0
+#define PCH_UART_FCR_RFTL16 PCH_UART_FCR_RFTL64
+#define PCH_UART_FCR_RFTL32 PCH_UART_FCR_RFTL128
+#define PCH_UART_FCR_RFTL56 PCH_UART_FCR_RFTL224
+#define PCH_UART_FCR_RFTL4 PCH_UART_FCR_RFTL64
+#define PCH_UART_FCR_RFTL8 PCH_UART_FCR_RFTL128
+#define PCH_UART_FCR_RFTL14 PCH_UART_FCR_RFTL224
+#define PCH_UART_FCR_RFTL_SHIFT 6
+
+#define PCH_UART_LCR_WLS 0x00000003
+#define PCH_UART_LCR_STB 0x00000004
+#define PCH_UART_LCR_PEN 0x00000008
+#define PCH_UART_LCR_EPS 0x00000010
+#define PCH_UART_LCR_SP 0x00000020
+#define PCH_UART_LCR_SB 0x00000040
+#define PCH_UART_LCR_DLAB 0x00000080
+#define PCH_UART_LCR_NP 0x00000000
+#define PCH_UART_LCR_OP PCH_UART_LCR_PEN
+#define PCH_UART_LCR_EP (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS)
+#define PCH_UART_LCR_1P (PCH_UART_LCR_PEN | PCH_UART_LCR_SP)
+#define PCH_UART_LCR_0P (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS |\
+ PCH_UART_LCR_SP)
+
+#define PCH_UART_LCR_5BIT 0x00000000
+#define PCH_UART_LCR_6BIT 0x00000001
+#define PCH_UART_LCR_7BIT 0x00000002
+#define PCH_UART_LCR_8BIT 0x00000003
+
+#define PCH_UART_MCR_DTR 0x00000001
+#define PCH_UART_MCR_RTS 0x00000002
+#define PCH_UART_MCR_OUT 0x0000000C
+#define PCH_UART_MCR_LOOP 0x00000010
+#define PCH_UART_MCR_AFE 0x00000020
+
+#define PCH_UART_LSR_DR 0x00000001
+#define PCH_UART_LSR_ERR (1<<7)
+
+#define PCH_UART_MSR_DCTS 0x00000001
+#define PCH_UART_MSR_DDSR 0x00000002
+#define PCH_UART_MSR_TERI 0x00000004
+#define PCH_UART_MSR_DDCD 0x00000008
+#define PCH_UART_MSR_CTS 0x00000010
+#define PCH_UART_MSR_DSR 0x00000020
+#define PCH_UART_MSR_RI 0x00000040
+#define PCH_UART_MSR_DCD 0x00000080
+#define PCH_UART_MSR_DELTA (PCH_UART_MSR_DCTS | PCH_UART_MSR_DDSR |\
+ PCH_UART_MSR_TERI | PCH_UART_MSR_DDCD)
+
+#define PCH_UART_DLL 0x00
+#define PCH_UART_DLM 0x01
+
+#define PCH_UART_BRCSR 0x0E
+
+#define PCH_UART_IID_RLS (PCH_UART_IIR_REI)
+#define PCH_UART_IID_RDR (PCH_UART_IIR_RRI)
+#define PCH_UART_IID_RDR_TO (PCH_UART_IIR_RRI | PCH_UART_IIR_TOI)
+#define PCH_UART_IID_THRE (PCH_UART_IIR_TRI)
+#define PCH_UART_IID_MS (PCH_UART_IIR_MSI)
+
+#define PCH_UART_HAL_PARITY_NONE (PCH_UART_LCR_NP)
+#define PCH_UART_HAL_PARITY_ODD (PCH_UART_LCR_OP)
+#define PCH_UART_HAL_PARITY_EVEN (PCH_UART_LCR_EP)
+#define PCH_UART_HAL_PARITY_FIX1 (PCH_UART_LCR_1P)
+#define PCH_UART_HAL_PARITY_FIX0 (PCH_UART_LCR_0P)
+#define PCH_UART_HAL_5BIT (PCH_UART_LCR_5BIT)
+#define PCH_UART_HAL_6BIT (PCH_UART_LCR_6BIT)
+#define PCH_UART_HAL_7BIT (PCH_UART_LCR_7BIT)
+#define PCH_UART_HAL_8BIT (PCH_UART_LCR_8BIT)
+#define PCH_UART_HAL_STB1 0
+#define PCH_UART_HAL_STB2 (PCH_UART_LCR_STB)
+
+#define PCH_UART_HAL_CLR_TX_FIFO (PCH_UART_FCR_TFR)
+#define PCH_UART_HAL_CLR_RX_FIFO (PCH_UART_FCR_RFR)
+#define PCH_UART_HAL_CLR_ALL_FIFO (PCH_UART_HAL_CLR_TX_FIFO | \
+ PCH_UART_HAL_CLR_RX_FIFO)
+
+#define PCH_UART_HAL_DMA_MODE0 0
+#define PCH_UART_HAL_FIFO_DIS 0
+#define PCH_UART_HAL_FIFO16 (PCH_UART_FCR_FIFOE)
+#define PCH_UART_HAL_FIFO256 (PCH_UART_FCR_FIFOE | \
+ PCH_UART_FCR_FIFO256)
+#define PCH_UART_HAL_FIFO64 (PCH_UART_HAL_FIFO256)
+#define PCH_UART_HAL_TRIGGER1 (PCH_UART_FCR_RFTL1)
+#define PCH_UART_HAL_TRIGGER64 (PCH_UART_FCR_RFTL64)
+#define PCH_UART_HAL_TRIGGER128 (PCH_UART_FCR_RFTL128)
+#define PCH_UART_HAL_TRIGGER224 (PCH_UART_FCR_RFTL224)
+#define PCH_UART_HAL_TRIGGER16 (PCH_UART_FCR_RFTL16)
+#define PCH_UART_HAL_TRIGGER32 (PCH_UART_FCR_RFTL32)
+#define PCH_UART_HAL_TRIGGER56 (PCH_UART_FCR_RFTL56)
+#define PCH_UART_HAL_TRIGGER4 (PCH_UART_FCR_RFTL4)
+#define PCH_UART_HAL_TRIGGER8 (PCH_UART_FCR_RFTL8)
+#define PCH_UART_HAL_TRIGGER14 (PCH_UART_FCR_RFTL14)
+#define PCH_UART_HAL_TRIGGER_L (PCH_UART_FCR_RFTL64)
+#define PCH_UART_HAL_TRIGGER_M (PCH_UART_FCR_RFTL128)
+#define PCH_UART_HAL_TRIGGER_H (PCH_UART_FCR_RFTL224)
+
+#define PCH_UART_HAL_RX_INT (PCH_UART_IER_ERBFI)
+#define PCH_UART_HAL_TX_INT (PCH_UART_IER_ETBEI)
+#define PCH_UART_HAL_RX_ERR_INT (PCH_UART_IER_ELSI)
+#define PCH_UART_HAL_MS_INT (PCH_UART_IER_EDSSI)
+#define PCH_UART_HAL_ALL_INT (PCH_UART_IER_MASK)
+
+#define PCH_UART_HAL_DTR (PCH_UART_MCR_DTR)
+#define PCH_UART_HAL_RTS (PCH_UART_MCR_RTS)
+#define PCH_UART_HAL_OUT (PCH_UART_MCR_OUT)
+#define PCH_UART_HAL_LOOP (PCH_UART_MCR_LOOP)
+#define PCH_UART_HAL_AFE (PCH_UART_MCR_AFE)
+
+#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
+
+#define DEFAULT_UARTCLK 1843200 /* 1.8432 MHz */
+#define CMITC_UARTCLK 192000000 /* 192.0000 MHz */
+#define FRI2_64_UARTCLK 64000000 /* 64.0000 MHz */
+#define FRI2_48_UARTCLK 48000000 /* 48.0000 MHz */
+#define NTC1_UARTCLK 64000000 /* 64.0000 MHz */
+#define MINNOW_UARTCLK 50000000 /* 50.0000 MHz */
+
+struct pch_uart_buffer {
+ unsigned char *buf;
+ int size;
+};
+
+struct eg20t_port {
+ struct uart_port port;
+ int port_type;
+ void __iomem *membase;
+ resource_size_t mapbase;
+ unsigned int iobase;
+ struct pci_dev *pdev;
+ int fifo_size;
+ unsigned int uartclk;
+ int start_tx;
+ int start_rx;
+ int tx_empty;
+ int trigger;
+ int trigger_level;
+ struct pch_uart_buffer rxbuf;
+ unsigned int dmsr;
+ unsigned int fcr;
+ unsigned int mcr;
+ unsigned int use_dma;
+ struct dma_async_tx_descriptor *desc_tx;
+ struct dma_async_tx_descriptor *desc_rx;
+ struct pch_dma_slave param_tx;
+ struct pch_dma_slave param_rx;
+ struct dma_chan *chan_tx;
+ struct dma_chan *chan_rx;
+ struct scatterlist *sg_tx_p;
+ int nent;
+ int orig_nent;
+ struct scatterlist sg_rx;
+ int tx_dma_use;
+ void *rx_buf_virt;
+ dma_addr_t rx_buf_dma;
+
+ struct dentry *debugfs;
+#define IRQ_NAME_SIZE 17
+ char irq_name[IRQ_NAME_SIZE];
+
+ /* protect the eg20t_port private structure and io access to membase */
+ spinlock_t lock;
+};
+
+/**
+ * struct pch_uart_driver_data - private data structure for UART-DMA
+ * @port_type: The type of UART port
+ * @line_no: UART port line number (0, 1, 2...)
+ */
+struct pch_uart_driver_data {
+ int port_type;
+ int line_no;
+};
+
+enum pch_uart_num_t {
+ pch_et20t_uart0 = 0,
+ pch_et20t_uart1,
+ pch_et20t_uart2,
+ pch_et20t_uart3,
+ pch_ml7213_uart0,
+ pch_ml7213_uart1,
+ pch_ml7213_uart2,
+ pch_ml7223_uart0,
+ pch_ml7223_uart1,
+ pch_ml7831_uart0,
+ pch_ml7831_uart1,
+};
+
+static struct pch_uart_driver_data drv_dat[] = {
+ [pch_et20t_uart0] = {PORT_PCH_8LINE, 0},
+ [pch_et20t_uart1] = {PORT_PCH_2LINE, 1},
+ [pch_et20t_uart2] = {PORT_PCH_2LINE, 2},
+ [pch_et20t_uart3] = {PORT_PCH_2LINE, 3},
+ [pch_ml7213_uart0] = {PORT_PCH_8LINE, 0},
+ [pch_ml7213_uart1] = {PORT_PCH_2LINE, 1},
+ [pch_ml7213_uart2] = {PORT_PCH_2LINE, 2},
+ [pch_ml7223_uart0] = {PORT_PCH_8LINE, 0},
+ [pch_ml7223_uart1] = {PORT_PCH_2LINE, 1},
+ [pch_ml7831_uart0] = {PORT_PCH_8LINE, 0},
+ [pch_ml7831_uart1] = {PORT_PCH_2LINE, 1},
+};
+
+#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
+static struct eg20t_port *pch_uart_ports[PCH_UART_NR];
+#endif
+static unsigned int default_baud = 9600;
+static unsigned int user_uartclk = 0;
+static const int trigger_level_256[4] = { 1, 64, 128, 224 };
+static const int trigger_level_64[4] = { 1, 16, 32, 56 };
+static const int trigger_level_16[4] = { 1, 4, 8, 14 };
+static const int trigger_level_1[4] = { 1, 1, 1, 1 };
+
+#ifdef CONFIG_DEBUG_FS
+
+#define PCH_REGS_BUFSIZE 1024
+
+
+static ssize_t port_show_regs(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct eg20t_port *priv = file->private_data;
+ char *buf;
+ u32 len = 0;
+ ssize_t ret;
+ unsigned char lcr;
+
+ buf = kzalloc(PCH_REGS_BUFSIZE, GFP_KERNEL);
+ if (!buf)
+ return 0;
+
+ len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
+ "PCH EG20T port[%d] regs:\n", priv->port.line);
+
+ len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
+ "=================================\n");
+ len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
+ "IER: \t0x%02x\n", ioread8(priv->membase + UART_IER));
+ len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
+ "IIR: \t0x%02x\n", ioread8(priv->membase + UART_IIR));
+ len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
+ "LCR: \t0x%02x\n", ioread8(priv->membase + UART_LCR));
+ len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
+ "MCR: \t0x%02x\n", ioread8(priv->membase + UART_MCR));
+ len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
+ "LSR: \t0x%02x\n", ioread8(priv->membase + UART_LSR));
+ len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
+ "MSR: \t0x%02x\n", ioread8(priv->membase + UART_MSR));
+ len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
+ "BRCSR: \t0x%02x\n",
+ ioread8(priv->membase + PCH_UART_BRCSR));
+
+ lcr = ioread8(priv->membase + UART_LCR);
+ iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
+ len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
+ "DLL: \t0x%02x\n", ioread8(priv->membase + UART_DLL));
+ len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
+ "DLM: \t0x%02x\n", ioread8(priv->membase + UART_DLM));
+ iowrite8(lcr, priv->membase + UART_LCR);
+
+ if (len > PCH_REGS_BUFSIZE)
+ len = PCH_REGS_BUFSIZE;
+
+ ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+ kfree(buf);
+ return ret;
+}
+
+static const struct file_operations port_regs_ops = {
+ .owner = THIS_MODULE,
+ .open = simple_open,
+ .read = port_show_regs,
+ .llseek = default_llseek,
+};
+#endif /* CONFIG_DEBUG_FS */
+
+static const struct dmi_system_id pch_uart_dmi_table[] = {
+ {
+ .ident = "CM-iTC",
+ {
+ DMI_MATCH(DMI_BOARD_NAME, "CM-iTC"),
+ },
+ (void *)CMITC_UARTCLK,
+ },
+ {
+ .ident = "FRI2",
+ {
+ DMI_MATCH(DMI_BIOS_VERSION, "FRI2"),
+ },
+ (void *)FRI2_64_UARTCLK,
+ },
+ {
+ .ident = "Fish River Island II",
+ {
+ DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"),
+ },
+ (void *)FRI2_48_UARTCLK,
+ },
+ {
+ .ident = "COMe-mTT",
+ {
+ DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"),
+ },
+ (void *)NTC1_UARTCLK,
+ },
+ {
+ .ident = "nanoETXexpress-TT",
+ {
+ DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"),
+ },
+ (void *)NTC1_UARTCLK,
+ },
+ {
+ .ident = "MinnowBoard",
+ {
+ DMI_MATCH(DMI_BOARD_NAME, "MinnowBoard"),
+ },
+ (void *)MINNOW_UARTCLK,
+ },
+ { }
+};
+
+/* Return UART clock, checking for board specific clocks. */
+static unsigned int pch_uart_get_uartclk(void)
+{
+ const struct dmi_system_id *d;
+
+ if (user_uartclk)
+ return user_uartclk;
+
+ d = dmi_first_match(pch_uart_dmi_table);
+ if (d)
+ return (unsigned long)d->driver_data;
+
+ return DEFAULT_UARTCLK;
+}
+
+static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv,
+ unsigned int flag)
+{
+ u8 ier = ioread8(priv->membase + UART_IER);
+ ier |= flag & PCH_UART_IER_MASK;
+ iowrite8(ier, priv->membase + UART_IER);
+}
+
+static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
+ unsigned int flag)
+{
+ u8 ier = ioread8(priv->membase + UART_IER);
+ ier &= ~(flag & PCH_UART_IER_MASK);
+ iowrite8(ier, priv->membase + UART_IER);
+}
+
+static int pch_uart_hal_set_line(struct eg20t_port *priv, unsigned int baud,
+ unsigned int parity, unsigned int bits,
+ unsigned int stb)
+{
+ unsigned int dll, dlm, lcr;
+ int div;
+
+ div = DIV_ROUND_CLOSEST(priv->uartclk / 16, baud);
+ if (div < 0 || USHRT_MAX <= div) {
+ dev_err(priv->port.dev, "Invalid Baud(div=0x%x)\n", div);
+ return -EINVAL;
+ }
+
+ dll = (unsigned int)div & 0x00FFU;
+ dlm = ((unsigned int)div >> 8) & 0x00FFU;
+
+ if (parity & ~(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS | PCH_UART_LCR_SP)) {
+ dev_err(priv->port.dev, "Invalid parity(0x%x)\n", parity);
+ return -EINVAL;
+ }
+
+ if (bits & ~PCH_UART_LCR_WLS) {
+ dev_err(priv->port.dev, "Invalid bits(0x%x)\n", bits);
+ return -EINVAL;
+ }
+
+ if (stb & ~PCH_UART_LCR_STB) {
+ dev_err(priv->port.dev, "Invalid STB(0x%x)\n", stb);
+ return -EINVAL;
+ }
+
+ lcr = parity;
+ lcr |= bits;
+ lcr |= stb;
+
+ dev_dbg(priv->port.dev, "%s:baud = %u, div = %04x, lcr = %02x (%lu)\n",
+ __func__, baud, div, lcr, jiffies);
+ iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
+ iowrite8(dll, priv->membase + PCH_UART_DLL);
+ iowrite8(dlm, priv->membase + PCH_UART_DLM);
+ iowrite8(lcr, priv->membase + UART_LCR);
+
+ return 0;
+}
+
+static int pch_uart_hal_fifo_reset(struct eg20t_port *priv,
+ unsigned int flag)
+{
+ if (flag & ~(PCH_UART_FCR_TFR | PCH_UART_FCR_RFR)) {
+ dev_err(priv->port.dev, "%s:Invalid flag(0x%x)\n",
+ __func__, flag);
+ return -EINVAL;
+ }
+
+ iowrite8(PCH_UART_FCR_FIFOE | priv->fcr, priv->membase + UART_FCR);
+ iowrite8(PCH_UART_FCR_FIFOE | priv->fcr | flag,
+ priv->membase + UART_FCR);
+ iowrite8(priv->fcr, priv->membase + UART_FCR);
+
+ return 0;
+}
+
+static int pch_uart_hal_set_fifo(struct eg20t_port *priv,
+ unsigned int dmamode,
+ unsigned int fifo_size, unsigned int trigger)
+{
+ u8 fcr;
+
+ if (dmamode & ~PCH_UART_FCR_DMS) {
+ dev_err(priv->port.dev, "%s:Invalid DMA Mode(0x%x)\n",
+ __func__, dmamode);
+ return -EINVAL;
+ }
+
+ if (fifo_size & ~(PCH_UART_FCR_FIFOE | PCH_UART_FCR_FIFO256)) {
+ dev_err(priv->port.dev, "%s:Invalid FIFO SIZE(0x%x)\n",
+ __func__, fifo_size);
+ return -EINVAL;
+ }
+
+ if (trigger & ~PCH_UART_FCR_RFTL) {
+ dev_err(priv->port.dev, "%s:Invalid TRIGGER(0x%x)\n",
+ __func__, trigger);
+ return -EINVAL;
+ }
+
+ switch (priv->fifo_size) {
+ case 256:
+ priv->trigger_level =
+ trigger_level_256[trigger >> PCH_UART_FCR_RFTL_SHIFT];
+ break;
+ case 64:
+ priv->trigger_level =
+ trigger_level_64[trigger >> PCH_UART_FCR_RFTL_SHIFT];
+ break;
+ case 16:
+ priv->trigger_level =
+ trigger_level_16[trigger >> PCH_UART_FCR_RFTL_SHIFT];
+ break;
+ default:
+ priv->trigger_level =
+ trigger_level_1[trigger >> PCH_UART_FCR_RFTL_SHIFT];
+ break;
+ }
+ fcr =
+ dmamode | fifo_size | trigger | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR;
+ iowrite8(PCH_UART_FCR_FIFOE, priv->membase + UART_FCR);
+ iowrite8(PCH_UART_FCR_FIFOE | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR,
+ priv->membase + UART_FCR);
+ iowrite8(fcr, priv->membase + UART_FCR);
+ priv->fcr = fcr;
+
+ return 0;
+}
+
+static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
+{
+ unsigned int msr = ioread8(priv->membase + UART_MSR);
+ priv->dmsr = msr & PCH_UART_MSR_DELTA;
+ return (u8)msr;
+}
+
+static void pch_uart_hal_write(struct eg20t_port *priv,
+ const unsigned char *buf, int tx_size)
+{
+ int i;
+ unsigned int thr;
+
+ for (i = 0; i < tx_size;) {
+ thr = buf[i++];
+ iowrite8(thr, priv->membase + PCH_UART_THR);
+ }
+}
+
+static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
+ int rx_size)
+{
+ int i;
+ u8 rbr, lsr;
+ struct uart_port *port = &priv->port;
+
+ lsr = ioread8(priv->membase + UART_LSR);
+ for (i = 0, lsr = ioread8(priv->membase + UART_LSR);
+ i < rx_size && lsr & (UART_LSR_DR | UART_LSR_BI);
+ lsr = ioread8(priv->membase + UART_LSR)) {
+ rbr = ioread8(priv->membase + PCH_UART_RBR);
+
+ if (lsr & UART_LSR_BI) {
+ port->icount.brk++;
+ if (uart_handle_break(port))
+ continue;
+ }
+ if (uart_handle_sysrq_char(port, rbr))
+ continue;
+
+ buf[i++] = rbr;
+ }
+ return i;
+}
+
+static unsigned char pch_uart_hal_get_iid(struct eg20t_port *priv)
+{
+ return ioread8(priv->membase + UART_IIR) &\
+ (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP);
+}
+
+static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
+{
+ return ioread8(priv->membase + UART_LSR);
+}
+
+static void pch_uart_hal_set_break(struct eg20t_port *priv, int on)
+{
+ unsigned int lcr;
+
+ lcr = ioread8(priv->membase + UART_LCR);
+ if (on)
+ lcr |= PCH_UART_LCR_SB;
+ else
+ lcr &= ~PCH_UART_LCR_SB;
+
+ iowrite8(lcr, priv->membase + UART_LCR);
+}
+
+static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
+ int size)
+{
+ struct uart_port *port = &priv->port;
+ struct tty_port *tport = &port->state->port;
+
+ tty_insert_flip_string(tport, buf, size);
+ tty_flip_buffer_push(tport);
+
+ return 0;
+}
+
+static int dma_push_rx(struct eg20t_port *priv, int size)
+{
+ int room;
+ struct uart_port *port = &priv->port;
+ struct tty_port *tport = &port->state->port;
+
+ room = tty_buffer_request_room(tport, size);
+
+ if (room < size)
+ dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
+ size - room);
+ if (!room)
+ return 0;
+
+ tty_insert_flip_string(tport, sg_virt(&priv->sg_rx), size);
+
+ port->icount.rx += room;
+
+ return room;
+}
+
+static void pch_free_dma(struct uart_port *port)
+{
+ struct eg20t_port *priv;
+ priv = container_of(port, struct eg20t_port, port);
+
+ if (priv->chan_tx) {
+ dma_release_channel(priv->chan_tx);
+ priv->chan_tx = NULL;
+ }
+ if (priv->chan_rx) {
+ dma_release_channel(priv->chan_rx);
+ priv->chan_rx = NULL;
+ }
+
+ if (priv->rx_buf_dma) {
+ dma_free_coherent(port->dev, port->fifosize, priv->rx_buf_virt,
+ priv->rx_buf_dma);
+ priv->rx_buf_virt = NULL;
+ priv->rx_buf_dma = 0;
+ }
+
+ return;
+}
+
+static bool filter(struct dma_chan *chan, void *slave)
+{
+ struct pch_dma_slave *param = slave;
+
+ if ((chan->chan_id == param->chan_id) && (param->dma_dev ==
+ chan->device->dev)) {
+ chan->private = param;
+ return true;
+ } else {
+ return false;
+ }
+}
+
+static void pch_request_dma(struct uart_port *port)
+{
+ dma_cap_mask_t mask;
+ struct dma_chan *chan;
+ struct pci_dev *dma_dev;
+ struct pch_dma_slave *param;
+ struct eg20t_port *priv =
+ container_of(port, struct eg20t_port, port);
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ /* Get DMA's dev information */
+ dma_dev = pci_get_slot(priv->pdev->bus,
+ PCI_DEVFN(PCI_SLOT(priv->pdev->devfn), 0));
+
+ /* Set Tx DMA */
+ param = &priv->param_tx;
+ param->dma_dev = &dma_dev->dev;
+ param->chan_id = priv->port.line * 2; /* Tx = 0, 2, 4, ... */
+
+ param->tx_reg = port->mapbase + UART_TX;
+ chan = dma_request_channel(mask, filter, param);
+ if (!chan) {
+ dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n",
+ __func__);
+ pci_dev_put(dma_dev);
+ return;
+ }
+ priv->chan_tx = chan;
+
+ /* Set Rx DMA */
+ param = &priv->param_rx;
+ param->dma_dev = &dma_dev->dev;
+ param->chan_id = priv->port.line * 2 + 1; /* Rx = Tx + 1 */
+
+ param->rx_reg = port->mapbase + UART_RX;
+ chan = dma_request_channel(mask, filter, param);
+ if (!chan) {
+ dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Rx)\n",
+ __func__);
+ dma_release_channel(priv->chan_tx);
+ priv->chan_tx = NULL;
+ pci_dev_put(dma_dev);
+ return;
+ }
+
+ /* Get Consistent memory for DMA */
+ priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
+ &priv->rx_buf_dma, GFP_KERNEL);
+ priv->chan_rx = chan;
+
+ pci_dev_put(dma_dev);
+}
+
+static void pch_dma_rx_complete(void *arg)
+{
+ struct eg20t_port *priv = arg;
+ struct uart_port *port = &priv->port;
+ int count;
+
+ dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE);
+ count = dma_push_rx(priv, priv->trigger_level);
+ if (count)
+ tty_flip_buffer_push(&port->state->port);
+ async_tx_ack(priv->desc_rx);
+ pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
+ PCH_UART_HAL_RX_ERR_INT);
+}
+
+static void pch_dma_tx_complete(void *arg)
+{
+ struct eg20t_port *priv = arg;
+ struct uart_port *port = &priv->port;
+ struct circ_buf *xmit = &port->state->xmit;
+ struct scatterlist *sg = priv->sg_tx_p;
+ int i;
+
+ for (i = 0; i < priv->nent; i++, sg++) {
+ xmit->tail += sg_dma_len(sg);
+ port->icount.tx += sg_dma_len(sg);
+ }
+ xmit->tail &= UART_XMIT_SIZE - 1;
+ async_tx_ack(priv->desc_tx);
+ dma_unmap_sg(port->dev, priv->sg_tx_p, priv->orig_nent, DMA_TO_DEVICE);
+ priv->tx_dma_use = 0;
+ priv->nent = 0;
+ priv->orig_nent = 0;
+ kfree(priv->sg_tx_p);
+ pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
+}
+
+static int pop_tx(struct eg20t_port *priv, int size)
+{
+ int count = 0;
+ struct uart_port *port = &priv->port;
+ struct circ_buf *xmit = &port->state->xmit;
+
+ if (uart_tx_stopped(port) || uart_circ_empty(xmit) || count >= size)
+ goto pop_tx_end;
+
+ do {
+ int cnt_to_end =
+ CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ int sz = min(size - count, cnt_to_end);
+ pch_uart_hal_write(priv, &xmit->buf[xmit->tail], sz);
+ xmit->tail = (xmit->tail + sz) & (UART_XMIT_SIZE - 1);
+ count += sz;
+ } while (!uart_circ_empty(xmit) && count < size);
+
+pop_tx_end:
+ dev_dbg(priv->port.dev, "%d characters. Remained %d characters.(%lu)\n",
+ count, size - count, jiffies);
+
+ return count;
+}
+
+static int handle_rx_to(struct eg20t_port *priv)
+{
+ struct pch_uart_buffer *buf;
+ int rx_size;
+ int ret;
+ if (!priv->start_rx) {
+ pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
+ PCH_UART_HAL_RX_ERR_INT);
+ return 0;
+ }
+ buf = &priv->rxbuf;
+ do {
+ rx_size = pch_uart_hal_read(priv, buf->buf, buf->size);
+ ret = push_rx(priv, buf->buf, rx_size);
+ if (ret)
+ return 0;
+ } while (rx_size == buf->size);
+
+ return PCH_UART_HANDLED_RX_INT;
+}
+
+static int handle_rx(struct eg20t_port *priv)
+{
+ return handle_rx_to(priv);
+}
+
+static int dma_handle_rx(struct eg20t_port *priv)
+{
+ struct uart_port *port = &priv->port;
+ struct dma_async_tx_descriptor *desc;
+ struct scatterlist *sg;
+
+ priv = container_of(port, struct eg20t_port, port);
+ sg = &priv->sg_rx;
+
+ sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */
+
+ sg_dma_len(sg) = priv->trigger_level;
+
+ sg_set_page(&priv->sg_rx, virt_to_page(priv->rx_buf_virt),
+ sg_dma_len(sg), offset_in_page(priv->rx_buf_virt));
+
+ sg_dma_address(sg) = priv->rx_buf_dma;
+
+ desc = dmaengine_prep_slave_sg(priv->chan_rx,
+ sg, 1, DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+
+ if (!desc)
+ return 0;
+
+ priv->desc_rx = desc;
+ desc->callback = pch_dma_rx_complete;
+ desc->callback_param = priv;
+ desc->tx_submit(desc);
+ dma_async_issue_pending(priv->chan_rx);
+
+ return PCH_UART_HANDLED_RX_INT;
+}
+
+static unsigned int handle_tx(struct eg20t_port *priv)
+{
+ struct uart_port *port = &priv->port;
+ struct circ_buf *xmit = &port->state->xmit;
+ int fifo_size;
+ int tx_size;
+ int size;
+ int tx_empty;
+
+ if (!priv->start_tx) {
+ dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
+ __func__, jiffies);
+ pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
+ priv->tx_empty = 1;
+ return 0;
+ }
+
+ fifo_size = max(priv->fifo_size, 1);
+ tx_empty = 1;
+ if (port->x_char) {
+ pch_uart_hal_write(priv, &port->x_char, 1);
+ port->icount.tx++;
+ port->x_char = 0;
+ tx_empty = 0;
+ fifo_size--;
+ }
+ size = min(xmit->head - xmit->tail, fifo_size);
+ if (size < 0)
+ size = fifo_size;
+
+ tx_size = pop_tx(priv, size);
+ if (tx_size > 0) {
+ port->icount.tx += tx_size;
+ tx_empty = 0;
+ }
+
+ priv->tx_empty = tx_empty;
+
+ if (tx_empty) {
+ pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
+ uart_write_wakeup(port);
+ }
+
+ return PCH_UART_HANDLED_TX_INT;
+}
+
+static unsigned int dma_handle_tx(struct eg20t_port *priv)
+{
+ struct uart_port *port = &priv->port;
+ struct circ_buf *xmit = &port->state->xmit;
+ struct scatterlist *sg;
+ int nent;
+ int fifo_size;
+ struct dma_async_tx_descriptor *desc;
+ int num;
+ int i;
+ int bytes;
+ int size;
+ int rem;
+
+ if (!priv->start_tx) {
+ dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
+ __func__, jiffies);
+ pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
+ priv->tx_empty = 1;
+ return 0;
+ }
+
+ if (priv->tx_dma_use) {
+ dev_dbg(priv->port.dev, "%s:Tx is not completed. (%lu)\n",
+ __func__, jiffies);
+ pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
+ priv->tx_empty = 1;
+ return 0;
+ }
+
+ fifo_size = max(priv->fifo_size, 1);
+
+ if (port->x_char) {
+ pch_uart_hal_write(priv, &port->x_char, 1);
+ port->icount.tx++;
+ port->x_char = 0;
+ fifo_size--;
+ }
+
+ bytes = min((int)CIRC_CNT(xmit->head, xmit->tail,
+ UART_XMIT_SIZE), CIRC_CNT_TO_END(xmit->head,
+ xmit->tail, UART_XMIT_SIZE));
+ if (!bytes) {
+ dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__);
+ pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
+ uart_write_wakeup(port);
+ return 0;
+ }
+
+ if (bytes > fifo_size) {
+ num = bytes / fifo_size + 1;
+ size = fifo_size;
+ rem = bytes % fifo_size;
+ } else {
+ num = 1;
+ size = bytes;
+ rem = bytes;
+ }
+
+ dev_dbg(priv->port.dev, "%s num=%d size=%d rem=%d\n",
+ __func__, num, size, rem);
+
+ priv->tx_dma_use = 1;
+
+ priv->sg_tx_p = kmalloc_array(num, sizeof(struct scatterlist), GFP_ATOMIC);
+ if (!priv->sg_tx_p) {
+ dev_err(priv->port.dev, "%s:kzalloc Failed\n", __func__);
+ return 0;
+ }
+
+ sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
+ sg = priv->sg_tx_p;
+
+ for (i = 0; i < num; i++, sg++) {
+ if (i == (num - 1))
+ sg_set_page(sg, virt_to_page(xmit->buf),
+ rem, fifo_size * i);
+ else
+ sg_set_page(sg, virt_to_page(xmit->buf),
+ size, fifo_size * i);
+ }
+
+ sg = priv->sg_tx_p;
+ nent = dma_map_sg(port->dev, sg, num, DMA_TO_DEVICE);
+ if (!nent) {
+ dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__);
+ return 0;
+ }
+ priv->orig_nent = num;
+ priv->nent = nent;
+
+ for (i = 0; i < nent; i++, sg++) {
+ sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) +
+ fifo_size * i;
+ sg_dma_address(sg) = (sg_dma_address(sg) &
+ ~(UART_XMIT_SIZE - 1)) + sg->offset;
+ if (i == (nent - 1))
+ sg_dma_len(sg) = rem;
+ else
+ sg_dma_len(sg) = size;
+ }
+
+ desc = dmaengine_prep_slave_sg(priv->chan_tx,
+ priv->sg_tx_p, nent, DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc) {
+ dev_err(priv->port.dev, "%s:dmaengine_prep_slave_sg Failed\n",
+ __func__);
+ return 0;
+ }
+ dma_sync_sg_for_device(port->dev, priv->sg_tx_p, nent, DMA_TO_DEVICE);
+ priv->desc_tx = desc;
+ desc->callback = pch_dma_tx_complete;
+ desc->callback_param = priv;
+
+ desc->tx_submit(desc);
+
+ dma_async_issue_pending(priv->chan_tx);
+
+ return PCH_UART_HANDLED_TX_INT;
+}
+
+static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
+{
+ struct uart_port *port = &priv->port;
+ struct tty_struct *tty = tty_port_tty_get(&port->state->port);
+ char *error_msg[5] = {};
+ int i = 0;
+
+ if (lsr & PCH_UART_LSR_ERR)
+ error_msg[i++] = "Error data in FIFO\n";
+
+ if (lsr & UART_LSR_FE) {
+ port->icount.frame++;
+ error_msg[i++] = " Framing Error\n";
+ }
+
+ if (lsr & UART_LSR_PE) {
+ port->icount.parity++;
+ error_msg[i++] = " Parity Error\n";
+ }
+
+ if (lsr & UART_LSR_OE) {
+ port->icount.overrun++;
+ error_msg[i++] = " Overrun Error\n";
+ }
+
+ if (tty == NULL) {
+ for (i = 0; error_msg[i] != NULL; i++)
+ dev_err(&priv->pdev->dev, error_msg[i]);
+ } else {
+ tty_kref_put(tty);
+ }
+}
+
+static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
+{
+ struct eg20t_port *priv = dev_id;
+ unsigned int handled;
+ u8 lsr;
+ int ret = 0;
+ unsigned char iid;
+ unsigned long flags;
+ int next = 1;
+ u8 msr;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ handled = 0;
+ while (next) {
+ iid = pch_uart_hal_get_iid(priv);
+ if (iid & PCH_UART_IIR_IP) /* No Interrupt */
+ break;
+ switch (iid) {
+ case PCH_UART_IID_RLS: /* Receiver Line Status */
+ lsr = pch_uart_hal_get_line_status(priv);
+ if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE |
+ UART_LSR_PE | UART_LSR_OE)) {
+ pch_uart_err_ir(priv, lsr);
+ ret = PCH_UART_HANDLED_RX_ERR_INT;
+ } else {
+ ret = PCH_UART_HANDLED_LS_INT;
+ }
+ break;
+ case PCH_UART_IID_RDR: /* Received Data Ready */
+ if (priv->use_dma) {
+ pch_uart_hal_disable_interrupt(priv,
+ PCH_UART_HAL_RX_INT |
+ PCH_UART_HAL_RX_ERR_INT);
+ ret = dma_handle_rx(priv);
+ if (!ret)
+ pch_uart_hal_enable_interrupt(priv,
+ PCH_UART_HAL_RX_INT |
+ PCH_UART_HAL_RX_ERR_INT);
+ } else {
+ ret = handle_rx(priv);
+ }
+ break;
+ case PCH_UART_IID_RDR_TO: /* Received Data Ready
+ (FIFO Timeout) */
+ ret = handle_rx_to(priv);
+ break;
+ case PCH_UART_IID_THRE: /* Transmitter Holding Register
+ Empty */
+ if (priv->use_dma)
+ ret = dma_handle_tx(priv);
+ else
+ ret = handle_tx(priv);
+ break;
+ case PCH_UART_IID_MS: /* Modem Status */
+ msr = pch_uart_hal_get_modem(priv);
+ next = 0; /* MS ir prioirty is the lowest. So, MS ir
+ means final interrupt */
+ if ((msr & UART_MSR_ANY_DELTA) == 0)
+ break;
+ ret |= PCH_UART_HANDLED_MS_INT;
+ break;
+ default: /* Never junp to this label */
+ dev_err(priv->port.dev, "%s:iid=%02x (%lu)\n", __func__,
+ iid, jiffies);
+ ret = -1;
+ next = 0;
+ break;
+ }
+ handled |= (unsigned int)ret;
+ }
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return IRQ_RETVAL(handled);
+}
+
+/* This function tests whether the transmitter fifo and shifter for the port
+ described by 'port' is empty. */
+static unsigned int pch_uart_tx_empty(struct uart_port *port)
+{
+ struct eg20t_port *priv;
+
+ priv = container_of(port, struct eg20t_port, port);
+ if (priv->tx_empty)
+ return TIOCSER_TEMT;
+ else
+ return 0;
+}
+
+/* Returns the current state of modem control inputs. */
+static unsigned int pch_uart_get_mctrl(struct uart_port *port)
+{
+ struct eg20t_port *priv;
+ u8 modem;
+ unsigned int ret = 0;
+
+ priv = container_of(port, struct eg20t_port, port);
+ modem = pch_uart_hal_get_modem(priv);
+
+ if (modem & UART_MSR_DCD)
+ ret |= TIOCM_CAR;
+
+ if (modem & UART_MSR_RI)
+ ret |= TIOCM_RNG;
+
+ if (modem & UART_MSR_DSR)
+ ret |= TIOCM_DSR;
+
+ if (modem & UART_MSR_CTS)
+ ret |= TIOCM_CTS;
+
+ return ret;
+}
+
+static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ u32 mcr = 0;
+ struct eg20t_port *priv = container_of(port, struct eg20t_port, port);
+
+ if (mctrl & TIOCM_DTR)
+ mcr |= UART_MCR_DTR;
+ if (mctrl & TIOCM_RTS)
+ mcr |= UART_MCR_RTS;
+ if (mctrl & TIOCM_LOOP)
+ mcr |= UART_MCR_LOOP;
+
+ if (priv->mcr & UART_MCR_AFE)
+ mcr |= UART_MCR_AFE;
+
+ if (mctrl)
+ iowrite8(mcr, priv->membase + UART_MCR);
+}
+
+static void pch_uart_stop_tx(struct uart_port *port)
+{
+ struct eg20t_port *priv;
+ priv = container_of(port, struct eg20t_port, port);
+ priv->start_tx = 0;
+ priv->tx_dma_use = 0;
+}
+
+static void pch_uart_start_tx(struct uart_port *port)
+{
+ struct eg20t_port *priv;
+
+ priv = container_of(port, struct eg20t_port, port);
+
+ if (priv->use_dma) {
+ if (priv->tx_dma_use) {
+ dev_dbg(priv->port.dev, "%s : Tx DMA is NOT empty.\n",
+ __func__);
+ return;
+ }
+ }
+
+ priv->start_tx = 1;
+ pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
+}
+
+static void pch_uart_stop_rx(struct uart_port *port)
+{
+ struct eg20t_port *priv;
+ priv = container_of(port, struct eg20t_port, port);
+ priv->start_rx = 0;
+ pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
+ PCH_UART_HAL_RX_ERR_INT);
+}
+
+/* Enable the modem status interrupts. */
+static void pch_uart_enable_ms(struct uart_port *port)
+{
+ struct eg20t_port *priv;
+ priv = container_of(port, struct eg20t_port, port);
+ pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT);
+}
+
+/* Control the transmission of a break signal. */
+static void pch_uart_break_ctl(struct uart_port *port, int ctl)
+{
+ struct eg20t_port *priv;
+ unsigned long flags;
+
+ priv = container_of(port, struct eg20t_port, port);
+ spin_lock_irqsave(&priv->lock, flags);
+ pch_uart_hal_set_break(priv, ctl);
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+/* Grab any interrupt resources and initialise any low level driver state. */
+static int pch_uart_startup(struct uart_port *port)
+{
+ struct eg20t_port *priv;
+ int ret;
+ int fifo_size;
+ int trigger_level;
+
+ priv = container_of(port, struct eg20t_port, port);
+ priv->tx_empty = 1;
+
+ if (port->uartclk)
+ priv->uartclk = port->uartclk;
+ else
+ port->uartclk = priv->uartclk;
+
+ pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
+ ret = pch_uart_hal_set_line(priv, default_baud,
+ PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT,
+ PCH_UART_HAL_STB1);
+ if (ret)
+ return ret;
+
+ switch (priv->fifo_size) {
+ case 256:
+ fifo_size = PCH_UART_HAL_FIFO256;
+ break;
+ case 64:
+ fifo_size = PCH_UART_HAL_FIFO64;
+ break;
+ case 16:
+ fifo_size = PCH_UART_HAL_FIFO16;
+ break;
+ case 1:
+ default:
+ fifo_size = PCH_UART_HAL_FIFO_DIS;
+ break;
+ }
+
+ switch (priv->trigger) {
+ case PCH_UART_HAL_TRIGGER1:
+ trigger_level = 1;
+ break;
+ case PCH_UART_HAL_TRIGGER_L:
+ trigger_level = priv->fifo_size / 4;
+ break;
+ case PCH_UART_HAL_TRIGGER_M:
+ trigger_level = priv->fifo_size / 2;
+ break;
+ case PCH_UART_HAL_TRIGGER_H:
+ default:
+ trigger_level = priv->fifo_size - (priv->fifo_size / 8);
+ break;
+ }
+
+ priv->trigger_level = trigger_level;
+ ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
+ fifo_size, priv->trigger);
+ if (ret < 0)
+ return ret;
+
+ ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
+ priv->irq_name, priv);
+ if (ret < 0)
+ return ret;
+
+ if (priv->use_dma)
+ pch_request_dma(port);
+
+ priv->start_rx = 1;
+ pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
+ PCH_UART_HAL_RX_ERR_INT);
+ uart_update_timeout(port, CS8, default_baud);
+
+ return 0;
+}
+
+static void pch_uart_shutdown(struct uart_port *port)
+{
+ struct eg20t_port *priv;
+ int ret;
+
+ priv = container_of(port, struct eg20t_port, port);
+ pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
+ pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO);
+ ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
+ PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1);
+ if (ret)
+ dev_err(priv->port.dev,
+ "pch_uart_hal_set_fifo Failed(ret=%d)\n", ret);
+
+ pch_free_dma(port);
+
+ free_irq(priv->port.irq, priv);
+}
+
+/* Change the port parameters, including word length, parity, stop
+ *bits. Update read_status_mask and ignore_status_mask to indicate
+ *the types of events we are interested in receiving. */
+static void pch_uart_set_termios(struct uart_port *port,
+ struct ktermios *termios, struct ktermios *old)
+{
+ int rtn;
+ unsigned int baud, parity, bits, stb;
+ struct eg20t_port *priv;
+ unsigned long flags;
+
+ priv = container_of(port, struct eg20t_port, port);
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:
+ bits = PCH_UART_HAL_5BIT;
+ break;
+ case CS6:
+ bits = PCH_UART_HAL_6BIT;
+ break;
+ case CS7:
+ bits = PCH_UART_HAL_7BIT;
+ break;
+ default: /* CS8 */
+ bits = PCH_UART_HAL_8BIT;
+ break;
+ }
+ if (termios->c_cflag & CSTOPB)
+ stb = PCH_UART_HAL_STB2;
+ else
+ stb = PCH_UART_HAL_STB1;
+
+ if (termios->c_cflag & PARENB) {
+ if (termios->c_cflag & PARODD)
+ parity = PCH_UART_HAL_PARITY_ODD;
+ else
+ parity = PCH_UART_HAL_PARITY_EVEN;
+
+ } else
+ parity = PCH_UART_HAL_PARITY_NONE;
+
+ /* Only UART0 has auto hardware flow function */
+ if ((termios->c_cflag & CRTSCTS) && (priv->fifo_size == 256))
+ priv->mcr |= UART_MCR_AFE;
+ else
+ priv->mcr &= ~UART_MCR_AFE;
+
+ termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
+
+ baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ spin_lock(&port->lock);
+
+ uart_update_timeout(port, termios->c_cflag, baud);
+ rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb);
+ if (rtn)
+ goto out;
+
+ pch_uart_set_mctrl(&priv->port, priv->port.mctrl);
+ /* Don't rewrite B0 */
+ if (tty_termios_baud_rate(termios))
+ tty_termios_encode_baud_rate(termios, baud, baud);
+
+out:
+ spin_unlock(&port->lock);
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static const char *pch_uart_type(struct uart_port *port)
+{
+ return KBUILD_MODNAME;
+}
+
+static void pch_uart_release_port(struct uart_port *port)
+{
+ struct eg20t_port *priv;
+
+ priv = container_of(port, struct eg20t_port, port);
+ pci_iounmap(priv->pdev, priv->membase);
+ pci_release_regions(priv->pdev);
+}
+
+static int pch_uart_request_port(struct uart_port *port)
+{
+ struct eg20t_port *priv;
+ int ret;
+ void __iomem *membase;
+
+ priv = container_of(port, struct eg20t_port, port);
+ ret = pci_request_regions(priv->pdev, KBUILD_MODNAME);
+ if (ret < 0)
+ return -EBUSY;
+
+ membase = pci_iomap(priv->pdev, 1, 0);
+ if (!membase) {
+ pci_release_regions(priv->pdev);
+ return -EBUSY;
+ }
+ priv->membase = port->membase = membase;
+
+ return 0;
+}
+
+static void pch_uart_config_port(struct uart_port *port, int type)
+{
+ struct eg20t_port *priv;
+
+ priv = container_of(port, struct eg20t_port, port);
+ if (type & UART_CONFIG_TYPE) {
+ port->type = priv->port_type;
+ pch_uart_request_port(port);
+ }
+}
+
+static int pch_uart_verify_port(struct uart_port *port,
+ struct serial_struct *serinfo)
+{
+ struct eg20t_port *priv;
+
+ priv = container_of(port, struct eg20t_port, port);
+ if (serinfo->flags & UPF_LOW_LATENCY) {
+ dev_info(priv->port.dev,
+ "PCH UART : Use PIO Mode (without DMA)\n");
+ priv->use_dma = 0;
+ serinfo->flags &= ~UPF_LOW_LATENCY;
+ } else {
+#ifndef CONFIG_PCH_DMA
+ dev_err(priv->port.dev, "%s : PCH DMA is not Loaded.\n",
+ __func__);
+ return -EOPNOTSUPP;
+#endif
+ if (!priv->use_dma) {
+ pch_request_dma(port);
+ if (priv->chan_rx)
+ priv->use_dma = 1;
+ }
+ dev_info(priv->port.dev, "PCH UART: %s\n",
+ priv->use_dma ?
+ "Use DMA Mode" : "No DMA");
+ }
+
+ return 0;
+}
+
+#if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_PCH_UART_CONSOLE)
+/*
+ * Wait for transmitter & holding register to empty
+ */
+static void wait_for_xmitr(struct eg20t_port *up, int bits)
+{
+ unsigned int status, tmout = 10000;
+
+ /* Wait up to 10ms for the character(s) to be sent. */
+ for (;;) {
+ status = ioread8(up->membase + UART_LSR);
+
+ if ((status & bits) == bits)
+ break;
+ if (--tmout == 0)
+ break;
+ udelay(1);
+ }
+
+ /* Wait up to 1s for flow control if necessary */
+ if (up->port.flags & UPF_CONS_FLOW) {
+ unsigned int tmout;
+ for (tmout = 1000000; tmout; tmout--) {
+ unsigned int msr = ioread8(up->membase + UART_MSR);
+ if (msr & UART_MSR_CTS)
+ break;
+ udelay(1);
+ touch_nmi_watchdog();
+ }
+ }
+}
+#endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_PCH_UART_CONSOLE */
+
+#ifdef CONFIG_CONSOLE_POLL
+/*
+ * Console polling routines for communicate via uart while
+ * in an interrupt or debug context.
+ */
+static int pch_uart_get_poll_char(struct uart_port *port)
+{
+ struct eg20t_port *priv =
+ container_of(port, struct eg20t_port, port);
+ u8 lsr = ioread8(priv->membase + UART_LSR);
+
+ if (!(lsr & UART_LSR_DR))
+ return NO_POLL_CHAR;
+
+ return ioread8(priv->membase + PCH_UART_RBR);
+}
+
+
+static void pch_uart_put_poll_char(struct uart_port *port,
+ unsigned char c)
+{
+ unsigned int ier;
+ struct eg20t_port *priv =
+ container_of(port, struct eg20t_port, port);
+
+ /*
+ * First save the IER then disable the interrupts
+ */
+ ier = ioread8(priv->membase + UART_IER);
+ pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
+
+ wait_for_xmitr(priv, UART_LSR_THRE);
+ /*
+ * Send the character out.
+ */
+ iowrite8(c, priv->membase + PCH_UART_THR);
+
+ /*
+ * Finally, wait for transmitter to become empty
+ * and restore the IER
+ */
+ wait_for_xmitr(priv, BOTH_EMPTY);
+ iowrite8(ier, priv->membase + UART_IER);
+}
+#endif /* CONFIG_CONSOLE_POLL */
+
+static const struct uart_ops pch_uart_ops = {
+ .tx_empty = pch_uart_tx_empty,
+ .set_mctrl = pch_uart_set_mctrl,
+ .get_mctrl = pch_uart_get_mctrl,
+ .stop_tx = pch_uart_stop_tx,
+ .start_tx = pch_uart_start_tx,
+ .stop_rx = pch_uart_stop_rx,
+ .enable_ms = pch_uart_enable_ms,
+ .break_ctl = pch_uart_break_ctl,
+ .startup = pch_uart_startup,
+ .shutdown = pch_uart_shutdown,
+ .set_termios = pch_uart_set_termios,
+/* .pm = pch_uart_pm, Not supported yet */
+ .type = pch_uart_type,
+ .release_port = pch_uart_release_port,
+ .request_port = pch_uart_request_port,
+ .config_port = pch_uart_config_port,
+ .verify_port = pch_uart_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_get_char = pch_uart_get_poll_char,
+ .poll_put_char = pch_uart_put_poll_char,
+#endif
+};
+
+#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
+
+static void pch_console_putchar(struct uart_port *port, int ch)
+{
+ struct eg20t_port *priv =
+ container_of(port, struct eg20t_port, port);
+
+ wait_for_xmitr(priv, UART_LSR_THRE);
+ iowrite8(ch, priv->membase + PCH_UART_THR);
+}
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ *
+ * The console_lock must be held when we get here.
+ */
+static void
+pch_console_write(struct console *co, const char *s, unsigned int count)
+{
+ struct eg20t_port *priv;
+ unsigned long flags;
+ int priv_locked = 1;
+ int port_locked = 1;
+ u8 ier;
+
+ priv = pch_uart_ports[co->index];
+
+ touch_nmi_watchdog();
+
+ local_irq_save(flags);
+ if (priv->port.sysrq) {
+ /* call to uart_handle_sysrq_char already took the priv lock */
+ priv_locked = 0;
+ /* serial8250_handle_port() already took the port lock */
+ port_locked = 0;
+ } else if (oops_in_progress) {
+ priv_locked = spin_trylock(&priv->lock);
+ port_locked = spin_trylock(&priv->port.lock);
+ } else {
+ spin_lock(&priv->lock);
+ spin_lock(&priv->port.lock);
+ }
+
+ /*
+ * First save the IER then disable the interrupts
+ */
+ ier = ioread8(priv->membase + UART_IER);
+
+ pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
+
+ uart_console_write(&priv->port, s, count, pch_console_putchar);
+
+ /*
+ * Finally, wait for transmitter to become empty
+ * and restore the IER
+ */
+ wait_for_xmitr(priv, BOTH_EMPTY);
+ iowrite8(ier, priv->membase + UART_IER);
+
+ if (port_locked)
+ spin_unlock(&priv->port.lock);
+ if (priv_locked)
+ spin_unlock(&priv->lock);
+ local_irq_restore(flags);
+}
+
+static int __init pch_console_setup(struct console *co, char *options)
+{
+ struct uart_port *port;
+ int baud = default_baud;
+ int bits = 8;
+ int parity = 'n';
+ int flow = 'n';
+
+ /*
+ * Check whether an invalid uart number has been specified, and
+ * if so, search for the first available port that does have
+ * console support.
+ */
+ if (co->index >= PCH_UART_NR)
+ co->index = 0;
+ port = &pch_uart_ports[co->index]->port;
+
+ if (!port || (!port->iobase && !port->membase))
+ return -ENODEV;
+
+ port->uartclk = pch_uart_get_uartclk();
+
+ if (options)
+ uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+ return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver pch_uart_driver;
+
+static struct console pch_console = {
+ .name = PCH_UART_DRIVER_DEVICE,
+ .write = pch_console_write,
+ .device = uart_console_device,
+ .setup = pch_console_setup,
+ .flags = CON_PRINTBUFFER | CON_ANYTIME,
+ .index = -1,
+ .data = &pch_uart_driver,
+};
+
+#define PCH_CONSOLE (&pch_console)
+#else
+#define PCH_CONSOLE NULL
+#endif /* CONFIG_SERIAL_PCH_UART_CONSOLE */
+
+static struct uart_driver pch_uart_driver = {
+ .owner = THIS_MODULE,
+ .driver_name = KBUILD_MODNAME,
+ .dev_name = PCH_UART_DRIVER_DEVICE,
+ .major = 0,
+ .minor = 0,
+ .nr = PCH_UART_NR,
+ .cons = PCH_CONSOLE,
+};
+
+static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ struct eg20t_port *priv;
+ int ret;
+ unsigned int iobase;
+ unsigned int mapbase;
+ unsigned char *rxbuf;
+ int fifosize;
+ int port_type;
+ struct pch_uart_driver_data *board;
+#ifdef CONFIG_DEBUG_FS
+ char name[32]; /* for debugfs file name */
+#endif
+
+ board = &drv_dat[id->driver_data];
+ port_type = board->port_type;
+
+ priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
+ if (priv == NULL)
+ goto init_port_alloc_err;
+
+ rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
+ if (!rxbuf)
+ goto init_port_free_txbuf;
+
+ switch (port_type) {
+ case PORT_PCH_8LINE:
+ fifosize = 256; /* EG20T/ML7213: UART0 */
+ break;
+ case PORT_PCH_2LINE:
+ fifosize = 64; /* EG20T:UART1~3 ML7213: UART1~2*/
+ break;
+ default:
+ dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
+ goto init_port_hal_free;
+ }
+
+ pci_enable_msi(pdev);
+ pci_set_master(pdev);
+
+ spin_lock_init(&priv->lock);
+
+ iobase = pci_resource_start(pdev, 0);
+ mapbase = pci_resource_start(pdev, 1);
+ priv->mapbase = mapbase;
+ priv->iobase = iobase;
+ priv->pdev = pdev;
+ priv->tx_empty = 1;
+ priv->rxbuf.buf = rxbuf;
+ priv->rxbuf.size = PAGE_SIZE;
+
+ priv->fifo_size = fifosize;
+ priv->uartclk = pch_uart_get_uartclk();
+ priv->port_type = port_type;
+ priv->port.dev = &pdev->dev;
+ priv->port.iobase = iobase;
+ priv->port.membase = NULL;
+ priv->port.mapbase = mapbase;
+ priv->port.irq = pdev->irq;
+ priv->port.iotype = UPIO_PORT;
+ priv->port.ops = &pch_uart_ops;
+ priv->port.flags = UPF_BOOT_AUTOCONF;
+ priv->port.fifosize = fifosize;
+ priv->port.line = board->line_no;
+ priv->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_PCH_UART_CONSOLE);
+ priv->trigger = PCH_UART_HAL_TRIGGER_M;
+
+ snprintf(priv->irq_name, IRQ_NAME_SIZE,
+ KBUILD_MODNAME ":" PCH_UART_DRIVER_DEVICE "%d",
+ priv->port.line);
+
+ spin_lock_init(&priv->port.lock);
+
+ pci_set_drvdata(pdev, priv);
+ priv->trigger_level = 1;
+ priv->fcr = 0;
+
+ if (pdev->dev.of_node)
+ of_property_read_u32(pdev->dev.of_node, "clock-frequency"
+ , &user_uartclk);
+
+#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
+ pch_uart_ports[board->line_no] = priv;
+#endif
+ ret = uart_add_one_port(&pch_uart_driver, &priv->port);
+ if (ret < 0)
+ goto init_port_hal_free;
+
+#ifdef CONFIG_DEBUG_FS
+ snprintf(name, sizeof(name), "uart%d_regs", board->line_no);
+ priv->debugfs = debugfs_create_file(name, S_IFREG | S_IRUGO,
+ NULL, priv, &port_regs_ops);
+#endif
+
+ return priv;
+
+init_port_hal_free:
+#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
+ pch_uart_ports[board->line_no] = NULL;
+#endif
+ free_page((unsigned long)rxbuf);
+init_port_free_txbuf:
+ kfree(priv);
+init_port_alloc_err:
+
+ return NULL;
+}
+
+static void pch_uart_exit_port(struct eg20t_port *priv)
+{
+
+#ifdef CONFIG_DEBUG_FS
+ debugfs_remove(priv->debugfs);
+#endif
+ uart_remove_one_port(&pch_uart_driver, &priv->port);
+ free_page((unsigned long)priv->rxbuf.buf);
+}
+
+static void pch_uart_pci_remove(struct pci_dev *pdev)
+{
+ struct eg20t_port *priv = pci_get_drvdata(pdev);
+
+ pci_disable_msi(pdev);
+
+#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
+ pch_uart_ports[priv->port.line] = NULL;
+#endif
+ pch_uart_exit_port(priv);
+ pci_disable_device(pdev);
+ kfree(priv);
+ return;
+}
+
+static int __maybe_unused pch_uart_pci_suspend(struct device *dev)
+{
+ struct eg20t_port *priv = dev_get_drvdata(dev);
+
+ uart_suspend_port(&pch_uart_driver, &priv->port);
+
+ return 0;
+}
+
+static int __maybe_unused pch_uart_pci_resume(struct device *dev)
+{
+ struct eg20t_port *priv = dev_get_drvdata(dev);
+
+ uart_resume_port(&pch_uart_driver, &priv->port);
+
+ return 0;
+}
+
+static const struct pci_device_id pch_uart_pci_id[] = {
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
+ .driver_data = pch_et20t_uart0},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
+ .driver_data = pch_et20t_uart1},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
+ .driver_data = pch_et20t_uart2},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
+ .driver_data = pch_et20t_uart3},
+ {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027),
+ .driver_data = pch_ml7213_uart0},
+ {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028),
+ .driver_data = pch_ml7213_uart1},
+ {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029),
+ .driver_data = pch_ml7213_uart2},
+ {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800C),
+ .driver_data = pch_ml7223_uart0},
+ {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800D),
+ .driver_data = pch_ml7223_uart1},
+ {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8811),
+ .driver_data = pch_ml7831_uart0},
+ {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8812),
+ .driver_data = pch_ml7831_uart1},
+ {0,},
+};
+
+static int pch_uart_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ int ret;
+ struct eg20t_port *priv;
+
+ ret = pci_enable_device(pdev);
+ if (ret < 0)
+ goto probe_error;
+
+ priv = pch_uart_init_port(pdev, id);
+ if (!priv) {
+ ret = -EBUSY;
+ goto probe_disable_device;
+ }
+ pci_set_drvdata(pdev, priv);
+
+ return ret;
+
+probe_disable_device:
+ pci_disable_msi(pdev);
+ pci_disable_device(pdev);
+probe_error:
+ return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(pch_uart_pci_pm_ops,
+ pch_uart_pci_suspend,
+ pch_uart_pci_resume);
+
+static struct pci_driver pch_uart_pci_driver = {
+ .name = "pch_uart",
+ .id_table = pch_uart_pci_id,
+ .probe = pch_uart_pci_probe,
+ .remove = pch_uart_pci_remove,
+ .driver.pm = &pch_uart_pci_pm_ops,
+};
+
+static int __init pch_uart_module_init(void)
+{
+ int ret;
+
+ /* register as UART driver */
+ ret = uart_register_driver(&pch_uart_driver);
+ if (ret < 0)
+ return ret;
+
+ /* register as PCI driver */
+ ret = pci_register_driver(&pch_uart_pci_driver);
+ if (ret < 0)
+ uart_unregister_driver(&pch_uart_driver);
+
+ return ret;
+}
+module_init(pch_uart_module_init);
+
+static void __exit pch_uart_module_exit(void)
+{
+ pci_unregister_driver(&pch_uart_pci_driver);
+ uart_unregister_driver(&pch_uart_driver);
+}
+module_exit(pch_uart_module_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
+MODULE_DEVICE_TABLE(pci, pch_uart_pci_id);
+
+module_param(default_baud, uint, S_IRUGO);
+MODULE_PARM_DESC(default_baud,
+ "Default BAUD for initial driver state and console (default 9600)");
+module_param(user_uartclk, uint, S_IRUGO);
+MODULE_PARM_DESC(user_uartclk,
+ "Override UART default or board specific UART clock");