forked from luck/tmp_suning_uos_patched
ARM: PL011: add support for extended FIFO-size of PL011-r1p5
The latest r1p5-revision of the ARM PL011 UART has 32-byte FIFOs, while all earlier ones have 16-byte FIFOs. This patch suggests a way to set the FIFO-size correctly & flexibly by using a member function named get_fifosize, rather than using the fifosize member variable. The function takes the UARTPeriphID, and returns the correct FIFO size. Signed-off-by: Jongsung Kim <neidhard.kim@lge.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -73,32 +73,44 @@
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/* There is by now at least one vendor with differing details, so handle it */
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struct vendor_data {
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unsigned int ifls;
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unsigned int fifosize;
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unsigned int lcrh_tx;
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unsigned int lcrh_rx;
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bool oversampling;
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bool dma_threshold;
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bool cts_event_workaround;
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unsigned int (*get_fifosize)(unsigned int periphid);
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};
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static unsigned int get_fifosize_arm(unsigned int periphid)
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{
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unsigned int rev = (periphid >> 20) & 0xf;
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return rev < 3 ? 16 : 32;
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}
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static struct vendor_data vendor_arm = {
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.ifls = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
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.fifosize = 16,
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.lcrh_tx = UART011_LCRH,
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.lcrh_rx = UART011_LCRH,
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.oversampling = false,
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.dma_threshold = false,
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.cts_event_workaround = false,
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.get_fifosize = get_fifosize_arm,
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};
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static unsigned int get_fifosize_st(unsigned int periphid)
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{
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return 64;
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}
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static struct vendor_data vendor_st = {
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.ifls = UART011_IFLS_RX_HALF|UART011_IFLS_TX_HALF,
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.fifosize = 64,
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.lcrh_tx = ST_UART011_LCRH_TX,
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.lcrh_rx = ST_UART011_LCRH_RX,
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.oversampling = true,
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.dma_threshold = true,
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.cts_event_workaround = true,
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.get_fifosize = get_fifosize_st,
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};
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static struct uart_amba_port *amba_ports[UART_NR];
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@ -2133,7 +2145,7 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
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uap->lcrh_rx = vendor->lcrh_rx;
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uap->lcrh_tx = vendor->lcrh_tx;
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uap->old_cr = 0;
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uap->fifosize = vendor->fifosize;
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uap->fifosize = vendor->get_fifosize(dev->periphid);
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uap->port.dev = &dev->dev;
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uap->port.mapbase = dev->res.start;
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uap->port.membase = base;
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