openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

uart: pl011: Introduce register look up table 

Introduce register look up table as different SOC venders
may have different register offset for the some register.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jun Nie 2015-07-31 15:49:17 +08:00 committed by Greg Kroah-Hartman
parent 7b753f318d
commit 2c096a9eed
1 changed files with 50 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
drivers/tty/serial/amba-pl011.c
View File

@ -76,6 +76,7 @@ struct vendor_data {
unsigned int ifls;
unsigned int lcrh_tx;
unsigned int lcrh_rx;
u16 *reg_lut;
bool oversampling;
bool dma_threshold;
bool cts_event_workaround;
@ -107,6 +108,25 @@ enum reg_idx {
REG_DMACR = IDX(UART011_DMACR),
};
static u16 arm_reg[] = {
[REG_DR] = UART01x_DR,
[REG_RSR] = UART01x_RSR,
[REG_ST_DMAWM] = ~0,
[REG_FR] = UART01x_FR,
[REG_ST_LCRH_RX] = ~0,
[REG_ILPR] = UART01x_ILPR,
[REG_IBRD] = UART011_IBRD,
[REG_FBRD] = UART011_FBRD,
[REG_LCRH] = UART011_LCRH,
[REG_CR] = UART011_CR,
[REG_IFLS] = UART011_IFLS,
[REG_IMSC] = UART011_IMSC,
[REG_RIS] = UART011_RIS,
[REG_MIS] = UART011_MIS,
[REG_ICR] = UART011_ICR,
[REG_DMACR] = UART011_DMACR,
};
static unsigned int get_fifosize_arm(struct amba_device *dev)
{
return amba_rev(dev) < 3 ? 16 : 32;
@ -116,6 +136,7 @@ static struct vendor_data vendor_arm = {
.ifls = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
.lcrh_tx = REG_LCRH,
.lcrh_rx = REG_LCRH,
.reg_lut = arm_reg,
.oversampling = false,
.dma_threshold = false,
.cts_event_workaround = false,
@ -125,6 +146,7 @@ static struct vendor_data vendor_arm = {
};
static struct vendor_data vendor_sbsa = {
.reg_lut = arm_reg,
.oversampling = false,
.dma_threshold = false,
.cts_event_workaround = false,
@ -132,6 +154,25 @@ static struct vendor_data vendor_sbsa = {
.fixed_options = true,
};
static u16 st_reg[] = {
[REG_DR] = UART01x_DR,
[REG_RSR] = UART01x_RSR,
[REG_ST_DMAWM] = ST_UART011_DMAWM,
[REG_FR] = UART01x_FR,
[REG_ST_LCRH_RX] = ST_UART011_LCRH_RX,
[REG_ILPR] = UART01x_ILPR,
[REG_IBRD] = UART011_IBRD,
[REG_FBRD] = UART011_FBRD,
[REG_LCRH] = UART011_LCRH,
[REG_CR] = UART011_CR,
[REG_IFLS] = UART011_IFLS,
[REG_IMSC] = UART011_IMSC,
[REG_RIS] = UART011_RIS,
[REG_MIS] = UART011_MIS,
[REG_ICR] = UART011_ICR,
[REG_DMACR] = UART011_DMACR,
};
static unsigned int get_fifosize_st(struct amba_device *dev)
{
return 64;
@ -141,6 +182,7 @@ static struct vendor_data vendor_st = {
.ifls = UART011_IFLS_RX_HALF|UART011_IFLS_TX_HALF,
.lcrh_tx = REG_LCRH,
.lcrh_rx = REG_ST_LCRH_RX,
.reg_lut = st_reg,
.oversampling = true,
.dma_threshold = true,
.cts_event_workaround = true,
@ -186,6 +228,7 @@ struct uart_amba_port {
struct uart_port port;
struct clk *clk;
const struct vendor_data *vendor;
u16 *reg_lut;
unsigned int dmacr; /* dma control reg */
unsigned int im; /* interrupt mask */
unsigned int old_status;
@ -209,19 +252,19 @@ struct uart_amba_port {
static unsigned int pl011_readw(struct uart_amba_port *uap, int index)
{
WARN_ON(index > REG_NR);
return readw_relaxed(uap->port.membase + (index << 2));
return readw_relaxed(uap->port.membase + uap->reg_lut[index]);
}
static void pl011_writew(struct uart_amba_port *uap, int val, int index)
{
WARN_ON(index > REG_NR);
writew_relaxed(val, uap->port.membase + (index << 2));
writew_relaxed(val, uap->port.membase + uap->reg_lut[index]);
}
static void pl011_writeb(struct uart_amba_port *uap, u8 val, int index)
{
WARN_ON(index > REG_NR);
writeb_relaxed(val, uap->port.membase + (index << 2));
writeb_relaxed(val, uap->port.membase + uap->reg_lut[index]);
}
/*
@ -324,7 +367,7 @@ static void pl011_dma_probe(struct uart_amba_port *uap)
struct amba_pl011_data *plat = dev_get_platdata(uap->port.dev);
struct device *dev = uap->port.dev;
struct dma_slave_config tx_conf = {
.dst_addr = uap->port.mapbase + REG_DR,
.dst_addr = uap->port.mapbase + uap->reg_lut[REG_DR],
.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
.direction = DMA_MEM_TO_DEV,
.dst_maxburst = uap->fifosize >> 1,
@ -379,7 +422,7 @@ static void pl011_dma_probe(struct uart_amba_port *uap)
if (chan) {
struct dma_slave_config rx_conf = {
.src_addr = uap->port.mapbase + REG_DR,
.src_addr = uap->port.mapbase + uap->reg_lut[REG_DR],
.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
.direction = DMA_DEV_TO_MEM,
.src_maxburst = uap->fifosize >> 2,
@ -2413,6 +2456,7 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
return PTR_ERR(uap->clk);
uap->vendor = vendor;
uap->reg_lut = vendor->reg_lut;
uap->lcrh_rx = vendor->lcrh_rx;
uap->lcrh_tx = vendor->lcrh_tx;
uap->fifosize = vendor->get_fifosize(dev);
@ -2494,6 +2538,7 @@ static int sbsa_uart_probe(struct platform_device *pdev)
return -ENOMEM;
uap->vendor = &vendor_sbsa;
uap->reg_lut = vendor_sbsa.reg_lut;
uap->fifosize = 32;
uap->port.irq = platform_get_irq(pdev, 0);
uap->port.ops = &sbsa_uart_pops;