From: Noam Camus <noamc@ezchip.com>
To: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"jslaby@suse.com" <jslaby@suse.com>,
"peter@hurleysoftware.com" <peter@hurleysoftware.com>,
"fransklaver@gmail.com" <fransklaver@gmail.com>,
"Alexey.Brodkin@synopsys.com" <Alexey.Brodkin@synopsys.com>,
"vgupta@synopsys.com" <vgupta@synopsys.com>
Subject: RE: [PATCH-v8] serial: 8250_dw: Add support for big-endian MMIO accesses
Date: Thu, 10 Dec 2015 07:26:42 +0000 [thread overview]
Message-ID: <DB5PR02MB1141B69C5E327950511F4590D6E90@DB5PR02MB1141.eurprd02.prod.outlook.com> (raw)
In-Reply-To: <20151209131939.GA14285@kuha.fi.intel.com>
>From: Heikki Krogerus [mailto:heikki.krogerus@linux.intel.com]
>Sent: Wednesday, December 09, 2015 3:20 PM
>> @@ -171,7 +174,8 @@ static void dw8250_serial_out32(struct uart_port *p, int offset, int value)
>> if ((value & ~UART_LCR_SPAR) == (lcr & ~UART_LCR_SPAR))
>> return;
>> dw8250_force_idle(p);
>> - writel(value, p->membase + (UART_LCR << p->regshift));
>> + d->serial_out(value,
>> + p->membase + (UART_LCR << p->regshift));
>> }
>.. The way I see it, this is the only place where you would really need the new private serial_in/out hooks, so why not just check the >iotype here and based on that use writeb/writel/iowrite32be or what ever ..
In previous versions (V2) Greg dis-liked using iotype here this is why I added the private serial_in/serial_out
>> static void dw8250_setup_port(struct uart_port *p) {
>> struct uart_8250_port *up = up_to_u8250p(p);
>> + struct dw8250_data *d = p->private_data;
>> u32 reg;
>>
>> /*
>> * If the Component Version Register returns zero, we know that
>> * ADDITIONAL_FEATURES are not enabled. No need to go any further.
>> */
>> - reg = readl(p->membase + DW_UART_UCV);
>> + reg = d->serial_in(p->membase + DW_UART_UCV);
>> if (!reg)
>> return;
>>
>> dev_dbg(p->dev, "Designware UART version %c.%c%c\n",
>> (reg >> 24) & 0xff, (reg >> 16) & 0xff, (reg >> 8) & 0xff);
>>
>> - reg = readl(p->membase + DW_UART_CPR);
>> + reg = d->serial_in(p->membase + DW_UART_CPR);
>> if (!reg)
>> return;
>.. Here you could as well replace the direct readl calls with serial_port_in calls.
Again, if you meant here for using iotype it was rejected.
>> @@ -390,9 +434,19 @@ static int dw8250_probe(struct platform_device
>> *pdev)
>>
>> err = device_property_read_u32(p->dev, "reg-io-width", &val);
>> if (!err && val == 4) {
>> - p->iotype = UPIO_MEM32;
>> - p->serial_in = dw8250_serial_in32;
>> - p->serial_out = dw8250_serial_out32;
>> + p->iotype = of_device_is_big_endian(p->dev->of_node) ?
>> + UPIO_MEM32BE : UPIO_MEM32;
>If this has to be tied to DT, do this check in dw8250_quirks.
Thanks , I will move this to dw8250_quirks.
>> dw8250_quirks(p, data);
>>
>> + data->serial_in = _dw8250_serial_in32;
>> + data->serial_out = _dw8250_serial_out32;
>I don't think I understand what is going on here? You would never actually even use _dw8250_serial_in32be/out32be, no?
>Maybe I'm misunderstanding something.
This is a default in case where "reg-io-width != 4".
What is the case you see that they are not used? (_dw8250_serial_in32be is used from dw8250_setup_port just few lines below)
-Noam
next prev parent reply other threads:[~2015-12-10 7:26 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-22 9:34 [PATCH 0/4] *** 8250_dw *** Noam Camus
2015-07-22 9:34 ` [PATCH 1/4] serial: 8250_dw: Add support for big-endian MMIO accesses Noam Camus
2015-07-22 9:34 ` [PATCH 2/4] serial: 8250_dw: Add UPF_SKIP_TEST to flags depend on device tree Noam Camus
2015-07-22 9:34 ` [PATCH 3/4] serial: 8250_dw: Add UPF_FIXED_TYPE to flags Noam Camus
2015-07-22 9:34 ` [PATCH 4/4] serial: 8250_dw: use serial_in() and not readl() Noam Camus
2015-07-22 12:51 ` Peter Hurley
2015-07-23 10:40 ` Noam Camus
2015-07-22 12:38 ` [PATCH 3/4] serial: 8250_dw: Add UPF_FIXED_TYPE to flags Peter Hurley
2015-07-23 10:38 ` Noam Camus
2015-07-22 12:20 ` [PATCH 2/4] serial: 8250_dw: Add UPF_SKIP_TEST to flags depend on device tree Peter Hurley
2015-07-23 6:21 ` Noam Camus
2015-07-23 6:46 ` Frans Klaver
2015-07-22 12:19 ` [PATCH 1/4] serial: 8250_dw: Add support for big-endian MMIO accesses Peter Hurley
2015-07-22 12:41 ` Peter Hurley
2015-07-23 6:15 ` Noam Camus
2015-07-23 6:13 ` Noam Camus
[not found] ` <1437886478-29273-1-git-send-email-noamc@ezchip.com>
[not found] ` <1437886478-29273-2-git-send-email-noamc@ezchip.com>
[not found] ` <1437886478-29273-3-git-send-email-noamc@ezchip.com>
2015-08-03 23:42 ` [v2 2/3] serial: 8250_dw: dw8250_setup_port() use endianness aware read Greg KH
2015-08-10 19:13 ` Noam Camus
[not found] ` <1437886478-29273-4-git-send-email-noamc@ezchip.com>
2015-08-03 23:44 ` [v2 3/3] serial: 8250_dw: Add UPF_SKIP_TEST to flags depend on device tree Greg KH
2015-08-10 19:21 ` Noam Camus
2015-08-03 23:43 ` [v2 1/3] serial: 8250_dw: Add support for big-endian MMIO accesses Greg KH
2015-08-10 19:08 ` Noam Camus
[not found] ` <1439378312-6463-1-git-send-email-noamc@ezchip.com>
[not found] ` <1439378312-6463-2-git-send-email-noamc@ezchip.com>
[not found] ` <1439378312-6463-3-git-send-email-noamc@ezchip.com>
[not found] ` <1439378312-6463-4-git-send-email-noamc@ezchip.com>
2015-08-12 13:16 ` [v3 3/3] serial: 8250_dw: Add UPF_SKIP_TEST to flags depend on device tree Peter Hurley
2015-08-12 15:51 ` Noam Camus
2015-08-13 14:20 ` Vineet Gupta
2015-08-21 10:33 ` [v4 0/2] *** 8250_dw *** Noam Camus
2015-08-21 10:33 ` [v4 1/2] serial: 8250_dw: Add support for big-endian MMIO accesses Noam Camus
2015-08-21 10:33 ` [v4 2/2] serial: 8250_dw: dw8250_setup_port() use endianness aware read Noam Camus
2015-08-21 10:41 ` Vineet Gupta
2015-08-25 8:57 ` [v5] *** 8250_dw *** Noam Camus
2015-08-25 8:57 ` [v5] serial: 8250_dw: Add support for big-endian MMIO accesses Noam Camus
2015-10-04 17:37 ` Greg KH
2015-10-06 6:39 ` [v6] *** 8250_dw *** Noam Camus
2015-10-06 6:39 ` [v6] serial: 8250_dw: Add support for big-endian MMIO accesses Noam Camus
2015-10-06 7:25 ` kbuild test robot
2015-10-06 7:27 ` kbuild test robot
2015-10-06 7:56 ` Greg KH
2015-10-06 8:01 ` kbuild test robot
2015-10-06 8:53 ` [v7] *** 8250_dw *** Noam Camus
2015-10-06 8:53 ` [v7] serial: 8250_dw: Add support for big-endian MMIO accesses Noam Camus
2015-10-18 4:06 ` Greg KH
2015-10-18 5:30 ` Noam Camus
2015-10-18 5:57 ` Greg KH
2015-12-08 22:57 ` Noam Camus
2015-12-09 14:18 ` Andy Shevchenko
2015-12-10 7:30 ` Noam Camus
2015-10-18 9:01 ` [PATCH-v8] " Noam Camus
2015-12-09 13:19 ` Heikki Krogerus
2015-12-09 13:21 ` Heikki Krogerus
2015-12-10 7:26 ` Noam Camus [this message]
2015-12-10 9:31 ` Heikki Krogerus
2015-12-10 10:33 ` Heikki Krogerus
[not found] <45xw80lci7vs893wq469l1b0.1449765214447@com.syntomo.email>
2015-12-11 8:37 ` Heikki Krogerus
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