Commit 8cd90e50 authored by Jun Nie's avatar Jun Nie Committed by Greg Kroah-Hartman
Browse files

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: default avatarJun Nie <jun.nie@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 09dcc7df

drivers/tty/serial/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -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.

drivers/tty/serial/amba-pl011.c

+181 −14
Original line number Diff line number Diff line
@@ -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

}



/*

include/linux/amba/serial.h

+14 −0
Original line number Diff line number Diff line
@@ -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 */