uart: pl011: Add support to ZTE ZX296702 uart

Support ZTE uart with some registers differing offset.
Probe as platform device for not AMBA IP ID is
available on ZTE uart.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 687b1ea294b79bbf999c4c86747ee2df7ba30df5..ed299b9e63752b4ec9d319a7e989fe3307433a77 100644 (file)
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -47,12 +47,12 @@ config SERIAL_AMBA_PL010_CONSOLE
 
 config SERIAL_AMBA_PL011
        tristate "ARM AMBA PL011 serial port support"
-       depends on ARM_AMBA
+       depends on ARM_AMBA || SOC_ZX296702
        select SERIAL_CORE
        help
          This selects the ARM(R) AMBA(R) PrimeCell PL011 UART.  If you have
          an Integrator/PP2, Integrator/CP or Versatile platform, say Y or M
-         here.
+         here. Say Y or M if you have SOC_ZX296702.
 
          If unsure, say N.
 

diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 017443d092c151fde4b781721ee171bb945e87ce..2af09ab153b6db628c09bf248219a65a0e40387d 100644 (file)
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -74,6 +74,10 @@
 /* There is by now at least one vendor with differing details, so handle it */
 struct vendor_data {
        unsigned int            ifls;
+       unsigned int            fr_busy;
+       unsigned int            fr_dsr;
+       unsigned int            fr_cts;
+       unsigned int            fr_ri;
        unsigned int            lcrh_tx;
        unsigned int            lcrh_rx;
        u16                     *reg_lut;
@@ -127,6 +131,7 @@ static u16 arm_reg[] = {
        [REG_DMACR]             = UART011_DMACR,
 };
 
+#ifdef CONFIG_ARM_AMBA
 static unsigned int get_fifosize_arm(struct amba_device *dev)
 {
        return amba_rev(dev) < 3 ? 16 : 32;
@@ -134,6 +139,10 @@ static unsigned int get_fifosize_arm(struct amba_device *dev)
 
 static struct vendor_data vendor_arm = {
        .ifls                   = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
+       .fr_busy                = UART01x_FR_BUSY,
+       .fr_dsr                 = UART01x_FR_DSR,
+       .fr_cts                 = UART01x_FR_CTS,
+       .fr_ri                  = UART011_FR_RI,
        .lcrh_tx                = REG_LCRH,
        .lcrh_rx                = REG_LCRH,
        .reg_lut                = arm_reg,
@@ -144,8 +153,13 @@ static struct vendor_data vendor_arm = {
        .fixed_options          = false,
        .get_fifosize           = get_fifosize_arm,
 };
+#endif
 
 static struct vendor_data vendor_sbsa = {
+       .fr_busy                = UART01x_FR_BUSY,
+       .fr_dsr                 = UART01x_FR_DSR,
+       .fr_cts                 = UART01x_FR_CTS,
+       .fr_ri                  = UART011_FR_RI,
        .reg_lut                = arm_reg,
        .oversampling           = false,
        .dma_threshold          = false,
@@ -154,6 +168,7 @@ static struct vendor_data vendor_sbsa = {
        .fixed_options          = true,
 };
 
+#ifdef CONFIG_ARM_AMBA
 static u16 st_reg[] = {
        [REG_DR]                = UART01x_DR,
        [REG_RSR]               = UART01x_RSR,
@@ -180,6 +195,10 @@ static unsigned int get_fifosize_st(struct amba_device *dev)
 
 static struct vendor_data vendor_st = {
        .ifls                   = UART011_IFLS_RX_HALF|UART011_IFLS_TX_HALF,
+       .fr_busy                = UART01x_FR_BUSY,
+       .fr_dsr                 = UART01x_FR_DSR,
+       .fr_cts                 = UART01x_FR_CTS,
+       .fr_ri                  = UART011_FR_RI,
        .lcrh_tx                = REG_LCRH,
        .lcrh_rx                = REG_ST_LCRH_RX,
        .reg_lut                = st_reg,
@@ -190,6 +209,43 @@ static struct vendor_data vendor_st = {
        .fixed_options          = false,
        .get_fifosize           = get_fifosize_st,
 };
+#endif
+
+#ifdef CONFIG_SOC_ZX296702
+static u16 zte_reg[] = {
+       [REG_DR]                = ZX_UART01x_DR,
+       [REG_RSR]               = UART01x_RSR,
+       [REG_ST_DMAWM]          = ST_UART011_DMAWM,
+       [REG_FR]                = ZX_UART01x_FR,
+       [REG_ST_LCRH_RX]        = ST_UART011_LCRH_RX,
+       [REG_ILPR]              = UART01x_ILPR,
+       [REG_IBRD]              = UART011_IBRD,
+       [REG_FBRD]              = UART011_FBRD,
+       [REG_LCRH]              = ZX_UART011_LCRH_TX,
+       [REG_CR]                = ZX_UART011_CR,
+       [REG_IFLS]              = ZX_UART011_IFLS,
+       [REG_IMSC]              = ZX_UART011_IMSC,
+       [REG_RIS]               = ZX_UART011_RIS,
+       [REG_MIS]               = ZX_UART011_MIS,
+       [REG_ICR]               = ZX_UART011_ICR,
+       [REG_DMACR]             = ZX_UART011_DMACR,
+};
+
+static struct vendor_data vendor_zte = {
+       .ifls                   = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
+       .fr_busy                = ZX_UART01x_FR_BUSY,
+       .fr_dsr                 = ZX_UART01x_FR_DSR,
+       .fr_cts                 = ZX_UART01x_FR_CTS,
+       .fr_ri                  = ZX_UART011_FR_RI,
+       .lcrh_tx                = REG_LCRH,
+       .lcrh_rx                = REG_ST_LCRH_RX,
+       .reg_lut                = zte_reg,
+       .oversampling           = false,
+       .dma_threshold          = false,
+       .cts_event_workaround   = false,
+       .fixed_options          = false,
+};
+#endif
 
 /* Deals with DMA transactions */
 
@@ -233,6 +289,10 @@ struct uart_amba_port {
        unsigned int            im;             /* interrupt mask */
        unsigned int            old_status;
        unsigned int            fifosize;       /* vendor-specific */
+       unsigned int            fr_busy;        /* vendor-specific */
+       unsigned int            fr_dsr;         /* vendor-specific */
+       unsigned int            fr_cts;         /* vendor-specific */
+       unsigned int            fr_ri;          /* vendor-specific */
        unsigned int            lcrh_tx;        /* vendor-specific */
        unsigned int            lcrh_rx;        /* vendor-specific */
        unsigned int            old_cr;         /* state during shutdown */
@@ -1163,7 +1223,7 @@ static void pl011_dma_shutdown(struct uart_amba_port *uap)
                return;
 
        /* Disable RX and TX DMA */
-       while (pl011_readw(uap, REG_FR) & UART01x_FR_BUSY)
+       while (pl011_readw(uap, REG_FR) & uap->fr_busy)
                barrier();
 
        spin_lock_irq(&uap->port.lock);
@@ -1412,11 +1472,11 @@ static void pl011_modem_status(struct uart_amba_port *uap)
        if (delta & UART01x_FR_DCD)
                uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
 
-       if (delta & UART01x_FR_DSR)
+       if (delta & uap->fr_dsr)
                uap->port.icount.dsr++;
 
-       if (delta & UART01x_FR_CTS)
-               uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
+       if (delta & uap->fr_cts)
+               uart_handle_cts_change(&uap->port, status & uap->fr_cts);
 
        wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
 }
@@ -1487,7 +1547,7 @@ static unsigned int pl011_tx_empty(struct uart_port *port)
        struct uart_amba_port *uap =
            container_of(port, struct uart_amba_port, port);
        unsigned int status = pl011_readw(uap, REG_FR);
-       return status & (UART01x_FR_BUSY|UART01x_FR_TXFF) ? 0 : TIOCSER_TEMT;
+       return status & (uap->fr_busy|UART01x_FR_TXFF) ? 0 : TIOCSER_TEMT;
 }
 
 static unsigned int pl011_get_mctrl(struct uart_port *port)
@@ -1502,9 +1562,9 @@ static unsigned int pl011_get_mctrl(struct uart_port *port)
                result |= tiocmbit
 
        TIOCMBIT(UART01x_FR_DCD, TIOCM_CAR);
-       TIOCMBIT(UART01x_FR_DSR, TIOCM_DSR);
-       TIOCMBIT(UART01x_FR_CTS, TIOCM_CTS);
-       TIOCMBIT(UART011_FR_RI, TIOCM_RNG);
+       TIOCMBIT(uap->fr_dsr, TIOCM_DSR);
+       TIOCMBIT(uap->fr_cts, TIOCM_CTS);
+       TIOCMBIT(uap->fr_ri, TIOCM_RNG);
 #undef TIOCMBIT
        return result;
 }
@@ -1720,8 +1780,7 @@ static int pl011_startup(struct uart_port *port)
        /*
         * initialise the old status of the modem signals
         */
-       uap->old_status = pl011_readw(uap, REG_FR) &
-                       UART01x_FR_MODEM_ANY;
+       uap->old_status = pl011_readw(uap, REG_FR) & UART01x_FR_MODEM_ANY;
 
        /* Startup DMA */
        pl011_dma_startup(uap);
@@ -1800,7 +1859,7 @@ static void pl011_disable_interrupts(struct uart_amba_port *uap)
        /* mask all interrupts and clear all pending ones */
        uap->im = 0;
        pl011_writew(uap, uap->im, REG_IMSC);
-       pl011_writew(0xffff, REG_ICR);
+       pl011_writew(uap, 0xffff, REG_ICR);
 
        spin_unlock_irq(&uap->port.lock);
 }
@@ -2178,7 +2237,7 @@ pl011_console_write(struct console *co, const char *s, unsigned int count)
         */
        do {
                status = pl011_readw(uap, REG_FR);
-       } while (status & UART01x_FR_BUSY);
+       } while (status & uap->fr_busy);
        if (!uap->vendor->always_enabled)
                pl011_writew(uap, old_cr, REG_CR);
 
@@ -2295,7 +2354,7 @@ static void pl011_putc(struct uart_port *port, int c)
        while (pl011_readw(uap, REG_FR) & UART01x_FR_TXFF)
                ;
        pl011_writeb(uap, c, REG_DR);
-       while (pl011_readw(uap, REG_FR) & UART01x_FR_BUSY)
+       while (pl011_readw(uap, REG_FR) & uap->fr_busy)
                ;
 }
 
@@ -2441,6 +2500,7 @@ static int pl011_register_port(struct uart_amba_port *uap)
        return ret;
 }
 
+#ifdef CONFIG_ARM_AMBA
 static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
 {
        struct uart_amba_port *uap;
@@ -2464,6 +2524,10 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
        uap->reg_lut = vendor->reg_lut;
        uap->lcrh_rx = vendor->lcrh_rx;
        uap->lcrh_tx = vendor->lcrh_tx;
+       uap->fr_busy = vendor->fr_busy;
+       uap->fr_dsr = vendor->fr_dsr;
+       uap->fr_cts = vendor->fr_cts;
+       uap->fr_ri = vendor->fr_ri;
        uap->fifosize = vendor->get_fifosize(dev);
        uap->port.irq = dev->irq[0];
        uap->port.ops = &amba_pl011_pops;
@@ -2487,6 +2551,67 @@ static int pl011_remove(struct amba_device *dev)
        pl011_unregister_port(uap);
        return 0;
 }
+#endif
+
+#ifdef CONFIG_SOC_ZX296702
+static int zx_uart_probe(struct platform_device *pdev)
+{
+       struct uart_amba_port *uap;
+       struct vendor_data *vendor = &vendor_zte;
+       struct resource *res;
+       int portnr, ret;
+
+       portnr = pl011_find_free_port();
+       if (portnr < 0)
+               return portnr;
+
+       uap = devm_kzalloc(&pdev->dev, sizeof(struct uart_amba_port),
+                       GFP_KERNEL);
+       if (!uap) {
+               ret = -ENOMEM;
+               goto out;
+       }
+
+       uap->clk = devm_clk_get(&pdev->dev, NULL);
+       if (IS_ERR(uap->clk)) {
+               ret = PTR_ERR(uap->clk);
+               goto out;
+       }
+
+       uap->vendor     = vendor;
+       uap->reg_lut    = vendor->reg_lut;
+       uap->lcrh_rx    = vendor->lcrh_rx;
+       uap->lcrh_tx    = vendor->lcrh_tx;
+       uap->fr_busy    = vendor->fr_busy;
+       uap->fr_dsr     = vendor->fr_dsr;
+       uap->fr_cts     = vendor->fr_cts;
+       uap->fr_ri      = vendor->fr_ri;
+       uap->fifosize   = 16;
+       uap->port.irq   = platform_get_irq(pdev, 0);
+       uap->port.ops   = &amba_pl011_pops;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+       ret = pl011_setup_port(&pdev->dev, uap, res, portnr);
+       if (ret)
+               return ret;
+
+       platform_set_drvdata(pdev, uap);
+
+       return pl011_register_port(uap);
+out:
+       return ret;
+}
+
+static int zx_uart_remove(struct platform_device *pdev)
+{
+       struct uart_amba_port *uap = platform_get_drvdata(pdev);
+
+       uart_remove_one_port(&amba_reg, &uap->port);
+       pl011_unregister_port(uap);
+       return 0;
+}
+#endif
 
 #ifdef CONFIG_PM_SLEEP
 static int pl011_suspend(struct device *dev)
@@ -2544,6 +2669,10 @@ static int sbsa_uart_probe(struct platform_device *pdev)
 
        uap->vendor     = &vendor_sbsa;
        uap->reg_lut    = vendor_sbsa.reg_lut;
+       uap->fr_busy    = vendor_sbsa.fr_busy;
+       uap->fr_dsr     = vendor_sbsa.fr_dsr;
+       uap->fr_cts     = vendor_sbsa.fr_cts;
+       uap->fr_ri      = vendor_sbsa.fr_ri;
        uap->fifosize   = 32;
        uap->port.irq   = platform_get_irq(pdev, 0);
        uap->port.ops   = &sbsa_uart_pops;
@@ -2593,6 +2722,7 @@ static struct platform_driver arm_sbsa_uart_platform_driver = {
        },
 };
 
+#ifdef CONFIG_ARM_AMBA
 static struct amba_id pl011_ids[] = {
        {
                .id     = 0x00041011,
@@ -2618,20 +2748,57 @@ static struct amba_driver pl011_driver = {
        .probe          = pl011_probe,
        .remove         = pl011_remove,
 };
+#endif
+
+#ifdef CONFIG_SOC_ZX296702
+static const struct of_device_id zx_uart_dt_ids[] = {
+       { .compatible = "zte,zx296702-uart", },
+       { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, zx_uart_dt_ids);
+
+static struct platform_driver zx_uart_driver = {
+       .driver = {
+               .name   = "zx-uart",
+               .owner  = THIS_MODULE,
+               .pm     = &pl011_dev_pm_ops,
+               .of_match_table = zx_uart_dt_ids,
+       },
+       .probe          = zx_uart_probe,
+       .remove         = zx_uart_remove,
+};
+#endif
+
 
 static int __init pl011_init(void)
 {
+       int ret;
        printk(KERN_INFO "Serial: AMBA PL011 UART driver\n");
 
        if (platform_driver_register(&arm_sbsa_uart_platform_driver))
                pr_warn("could not register SBSA UART platform driver\n");
-       return amba_driver_register(&pl011_driver);
+
+#ifdef CONFIG_SOC_ZX296702
+       ret = platform_driver_register(&zx_uart_driver);
+       if (ret)
+               pr_warn("could not register ZX UART platform driver\n");
+#endif
+
+#ifdef CONFIG_ARM_AMBA
+       ret = amba_driver_register(&pl011_driver);
+#endif
+       return ret;
 }
 
 static void __exit pl011_exit(void)
 {
        platform_driver_unregister(&arm_sbsa_uart_platform_driver);
+#ifdef CONFIG_SOC_ZX296702
+       platform_driver_unregister(&zx_uart_driver);
+#endif
+#ifdef CONFIG_ARM_AMBA
        amba_driver_unregister(&pl011_driver);
+#endif
 }
 
 /*

diff --git a/include/linux/amba/serial.h b/include/linux/amba/serial.h
index 0ddb5c02ad8b6c279047c4c8c9c90e5516327ca7..6a0a89ed7f81cac2b9eb4d04414874fc46243cb3 100644 (file)
--- a/include/linux/amba/serial.h
+++ b/include/linux/amba/serial.h
@@ -33,12 +33,14 @@
 #define UART01x_DR             0x00    /* Data read or written from the interface. */
 #define UART01x_RSR            0x04    /* Receive status register (Read). */
 #define UART01x_ECR            0x04    /* Error clear register (Write). */
+#define ZX_UART01x_DR          0x04    /* Data read or written from the interface. */
 #define UART010_LCRH           0x08    /* Line control register, high byte. */
 #define ST_UART011_DMAWM       0x08    /* DMA watermark configure register. */
 #define UART010_LCRM           0x0C    /* Line control register, middle byte. */
 #define ST_UART011_TIMEOUT     0x0C    /* Timeout period register. */
 #define UART010_LCRL           0x10    /* Line control register, low byte. */
 #define UART010_CR             0x14    /* Control register. */
+#define ZX_UART01x_FR          0x14    /* Flag register (Read only). */
 #define UART01x_FR             0x18    /* Flag register (Read only). */
 #define UART010_IIR            0x1C    /* Interrupt identification register (Read). */
 #define UART010_ICR            0x1C    /* Interrupt clear register (Write). */
@@ -49,13 +51,21 @@
 #define UART011_LCRH           0x2c    /* Line control register. */
 #define ST_UART011_LCRH_TX     0x2c    /* Tx Line control register. */
 #define UART011_CR             0x30    /* Control register. */
+#define ZX_UART011_LCRH_TX     0x30    /* Tx Line control register. */
 #define UART011_IFLS           0x34    /* Interrupt fifo level select. */
+#define ZX_UART011_CR          0x34    /* Control register. */
+#define ZX_UART011_IFLS                0x38    /* Interrupt fifo level select. */
 #define UART011_IMSC           0x38    /* Interrupt mask. */
 #define UART011_RIS            0x3c    /* Raw interrupt status. */
 #define UART011_MIS            0x40    /* Masked interrupt status. */
+#define ZX_UART011_IMSC                0x40    /* Interrupt mask. */
 #define UART011_ICR            0x44    /* Interrupt clear register. */
+#define ZX_UART011_RIS         0x44    /* Raw interrupt status. */
 #define UART011_DMACR          0x48    /* DMA control register. */
+#define ZX_UART011_MIS         0x48    /* Masked interrupt status. */
+#define ZX_UART011_ICR         0x4c    /* Interrupt clear register. */
 #define ST_UART011_XFCR                0x50    /* XON/XOFF control register. */
+#define ZX_UART011_DMACR       0x50    /* DMA control register. */
 #define ST_UART011_XON1                0x54    /* XON1 register. */
 #define ST_UART011_XON2                0x58    /* XON2 register. */
 #define ST_UART011_XOFF1       0x5C    /* XON1 register. */
@@ -75,15 +85,19 @@
 #define UART01x_RSR_PE                 0x02
 #define UART01x_RSR_FE                 0x01
 
+#define ZX_UART01x_FR_BUSY     0x300
 #define UART011_FR_RI          0x100
 #define UART011_FR_TXFE                0x080
 #define UART011_FR_RXFF                0x040
 #define UART01x_FR_TXFF                0x020
 #define UART01x_FR_RXFE                0x010
 #define UART01x_FR_BUSY                0x008
+#define ZX_UART01x_FR_DSR       0x008
 #define UART01x_FR_DCD                 0x004
 #define UART01x_FR_DSR                 0x002
+#define ZX_UART01x_FR_CTS      0x002
 #define UART01x_FR_CTS                 0x001
+#define ZX_UART011_FR_RI       0x001
 #define UART01x_FR_TMSK                (UART01x_FR_TXFF + UART01x_FR_BUSY)
 
 #define UART011_CR_CTSEN       0x8000  /* CTS hardware flow control */