| Message ID | 1308567752-13451-2-git-send-email-thomas.abraham@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Jun 20, 2011 at 5:02 AM, Thomas Abraham <thomas.abraham@linaro.org> wrote: > The driver depends on pdev->dev.platform_data to retrive information > about the platform data even after the initialization. To add device > tree support, this has to be changed in way that the platform data > is avialable from driver's private data. This patch adds support > for keeping a copy of the plaform data in s3c24xx_uart_info and using > it when needed after the initialization. > > Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> > --- > drivers/tty/serial/s5pv210.c | 12 ++++++++++-- > drivers/tty/serial/samsung.c | 24 ++++++++++++++++++++---- > drivers/tty/serial/samsung.h | 4 +++- > 3 files changed, 33 insertions(+), 7 deletions(-) Hi Thomas. Don't forget you need to cc Alan Cox and the linux-serial mailing list for tty driver patches. Comments below... > > diff --git a/drivers/tty/serial/s5pv210.c b/drivers/tty/serial/s5pv210.c > index d6b2423..3b2021a 100644 > --- a/drivers/tty/serial/s5pv210.c > +++ b/drivers/tty/serial/s5pv210.c > @@ -27,9 +27,13 @@ > static int s5pv210_serial_setsource(struct uart_port *port, > struct s3c24xx_uart_clksrc *clk) > { > - struct s3c2410_uartcfg *cfg = port->dev->platform_data; > + struct s3c24xx_uart_port *ourport; > + struct s3c2410_uartcfg *cfg; > unsigned long ucon = rd_regl(port, S3C2410_UCON); > > + ourport = container_of(port, struct s3c24xx_uart_port, port); > + cfg = &ourport->info->cfg; > + > if ((cfg->clocks_size) == 1) > return 0; > > @@ -50,9 +54,13 @@ static int s5pv210_serial_setsource(struct uart_port *port, > static int s5pv210_serial_getsource(struct uart_port *port, > struct s3c24xx_uart_clksrc *clk) > { > - struct s3c2410_uartcfg *cfg = port->dev->platform_data; > + struct s3c24xx_uart_port *ourport; > + struct s3c2410_uartcfg *cfg; > u32 ucon = rd_regl(port, S3C2410_UCON); > > + ourport = container_of(port, struct s3c24xx_uart_port, port); > + cfg = &ourport->info->cfg; > + > clk->divisor = 1; > > if ((cfg->clocks_size) == 1) > diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c > index 7ead421..77d900f 100644 > --- a/drivers/tty/serial/samsung.c > +++ b/drivers/tty/serial/samsung.c > @@ -42,6 +42,7 @@ > #include <linux/delay.h> > #include <linux/clk.h> > #include <linux/cpufreq.h> > +#include <linux/slab.h> > > #include <asm/irq.h> > > @@ -169,10 +170,13 @@ static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *p > > static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port) > { > + struct s3c24xx_uart_port *ourport; > + > if (port->dev == NULL) > return NULL; > > - return (struct s3c2410_uartcfg *)port->dev->platform_data; > + ourport = container_of(port, struct s3c24xx_uart_port, port); > + return &ourport->info->cfg; > } > > static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport, > @@ -1053,7 +1057,7 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, > struct platform_device *platdev) > { > struct uart_port *port = &ourport->port; > - struct s3c2410_uartcfg *cfg; > + struct s3c2410_uartcfg *cfg = platdev->dev.platform_data; > struct resource *res; > int ret; > > @@ -1062,14 +1066,24 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, > if (platdev == NULL) > return -ENODEV; > > - cfg = s3c24xx_dev_to_cfg(&platdev->dev); > - > if (port->mapbase != 0) > return 0; > > + if (cfg) { > + memcpy((void *)&info->cfg, cfg, sizeof(struct s3c2410_uartcfg)); "info->cfg = *cfg;" should be sufficient. > + info->cfg.clocks = kzalloc(sizeof(struct s3c24xx_uart_clksrc) * > + cfg->clocks_size, GFP_KERNEL); > + if (!info->cfg.clocks) > + return -ENOMEM; > + memcpy(info->cfg.clocks, cfg->clocks, > + sizeof(struct s3c24xx_uart_clksrc) * cfg->clocks_size); > + } ewwh. There has to be a better way to do this. Part of the point of putting a copy of pdata into the private data structure is to simplify the driver so that kzallocing wouldn't be necessary. With that clock table, the driver actually gets more complex because both DT and non-DT paths now need to kzalloc a clock array. From what I can tell, the list of clocks on all mainlined platforms is a static array of one or two entries; min & max baud are always set to 0, and names are one of: - uclk & pclk - uclk - uclk1 - fclk (with divisor either 10 or 0) - pclk_low & uclk1 You could also make the clock structure a static array of 2 elements in the private data structure. That would simplify both this code and the followon DT patch. Also, peaking forward at what the 2nd patch does, I think that it might just be a little premature to try and decode the clock info from the DT. But I'll address that issue when replying to the second patch. > + > + cfg = &info->cfg; > if (cfg->hwport > CONFIG_SERIAL_SAMSUNG_UARTS) { > printk(KERN_ERR "%s: port %d bigger than %d\n", __func__, > cfg->hwport, CONFIG_SERIAL_SAMSUNG_UARTS); > + kfree(info->cfg.clocks); > return -ERANGE; > } > > @@ -1181,11 +1195,13 @@ EXPORT_SYMBOL_GPL(s3c24xx_serial_probe); > int __devexit s3c24xx_serial_remove(struct platform_device *dev) > { > struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); > + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); > > if (port) { > s3c24xx_serial_cpufreq_deregister(to_ourport(port)); > device_remove_file(&dev->dev, &dev_attr_clock_source); > uart_remove_one_port(&s3c24xx_uart_drv, port); > + kfree(info->cfg.clocks); > } > > return 0; > diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h > index a69d9a5..4f2f6f5 100644 > --- a/drivers/tty/serial/samsung.h > +++ b/drivers/tty/serial/samsung.h > @@ -24,6 +24,9 @@ struct s3c24xx_uart_info { > > unsigned int has_divslot:1; > > + /* copy of platform data */ I'd change this to "copy of /configuration/ data" since the data doesn't necessarily come from the platform_data pointer anymore. > + struct s3c2410_uartcfg cfg; > + > /* clock source control */ > > int (*get_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk); > @@ -56,7 +59,6 @@ struct s3c24xx_uart_port { > /* conversion functions */ > > #define s3c24xx_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev) > -#define s3c24xx_dev_to_cfg(__dev) (struct s3c2410_uartcfg *)((__dev)->platform_data) > > /* register access controls */ > > -- > 1.6.6.rc2 > > > _______________________________________________ > linaro-dev mailing list > linaro-dev@lists.linaro.org > http://lists.linaro.org/mailman/listinfo/linaro-dev >
Hi Grant, On 20 June 2011 21:24, Grant Likely <grant.likely@secretlab.ca> wrote: > On Mon, Jun 20, 2011 at 5:02 AM, Thomas Abraham > <thomas.abraham@linaro.org> wrote: >> The driver depends on pdev->dev.platform_data to retrive information >> about the platform data even after the initialization. To add device >> tree support, this has to be changed in way that the platform data >> is avialable from driver's private data. This patch adds support >> for keeping a copy of the plaform data in s3c24xx_uart_info and using >> it when needed after the initialization. >> >> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> >> --- >> drivers/tty/serial/s5pv210.c | 12 ++++++++++-- >> drivers/tty/serial/samsung.c | 24 ++++++++++++++++++++---- >> drivers/tty/serial/samsung.h | 4 +++- >> 3 files changed, 33 insertions(+), 7 deletions(-) > > Hi Thomas. > > Don't forget you need to cc Alan Cox and the linux-serial mailing list > for tty driver patches. Ok. I will do that when I submit the next version of the patch. > > Comments below... > >> >> diff --git a/drivers/tty/serial/s5pv210.c b/drivers/tty/serial/s5pv210.c >> index d6b2423..3b2021a 100644 >> --- a/drivers/tty/serial/s5pv210.c >> +++ b/drivers/tty/serial/s5pv210.c >> @@ -27,9 +27,13 @@ <snip> >> + if (cfg) { >> + memcpy((void *)&info->cfg, cfg, sizeof(struct s3c2410_uartcfg)); > > "info->cfg = *cfg;" should be sufficient. > >> + info->cfg.clocks = kzalloc(sizeof(struct s3c24xx_uart_clksrc) * >> + cfg->clocks_size, GFP_KERNEL); >> + if (!info->cfg.clocks) >> + return -ENOMEM; >> + memcpy(info->cfg.clocks, cfg->clocks, >> + sizeof(struct s3c24xx_uart_clksrc) * cfg->clocks_size); >> + } > > ewwh. There has to be a better way to do this. Part of the point of > putting a copy of pdata into the private data structure is to simplify > the driver so that kzallocing wouldn't be necessary. With that clock > table, the driver actually gets more complex because both DT and > non-DT paths now need to kzalloc a clock array. > > From what I can tell, the list of clocks on all mainlined platforms is > a static array of one or two entries; min & max baud are always set to > 0, and names are one of: > - uclk & pclk > - uclk > - uclk1 > - fclk (with divisor either 10 or 0) > - pclk_low & uclk1 > > You could also make the clock structure a static array of 2 elements > in the private data structure. That would simplify both this code and > the followon DT patch. > > Also, peaking forward at what the 2nd patch does, I think that it > might just be a little premature to try and decode the clock info from > the DT. But I'll address that issue when replying to the second > patch. Thanks for the suggestion. I had not thought about these issues. One possible option in this case is using Sylwester's suggestion of changing exynos4 clkdev support to be similar to the omap clkdev support. That way, an additional level of indirection is possible. The uart driver could than be modified to lookup clock with generic names like "uart_clksrc0", "uart_clksrc1" and "uart_clksrc2". With this, there will be no need to pass clock names to the uart driver. I will check if this can be done. > >> + >> + cfg = &info->cfg; >> if (cfg->hwport > CONFIG_SERIAL_SAMSUNG_UARTS) { >> printk(KERN_ERR "%s: port %d bigger than %d\n", __func__, >> cfg->hwport, CONFIG_SERIAL_SAMSUNG_UARTS); >> + kfree(info->cfg.clocks); >> return -ERANGE; >> } >> >> @@ -1181,11 +1195,13 @@ EXPORT_SYMBOL_GPL(s3c24xx_serial_probe); >> int __devexit s3c24xx_serial_remove(struct platform_device *dev) >> { >> struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); >> + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); >> >> if (port) { >> s3c24xx_serial_cpufreq_deregister(to_ourport(port)); >> device_remove_file(&dev->dev, &dev_attr_clock_source); >> uart_remove_one_port(&s3c24xx_uart_drv, port); >> + kfree(info->cfg.clocks); >> } >> >> return 0; >> diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h >> index a69d9a5..4f2f6f5 100644 >> --- a/drivers/tty/serial/samsung.h >> +++ b/drivers/tty/serial/samsung.h >> @@ -24,6 +24,9 @@ struct s3c24xx_uart_info { >> >> unsigned int has_divslot:1; >> >> + /* copy of platform data */ > > I'd change this to "copy of /configuration/ data" since the data > doesn't necessarily come from the platform_data pointer anymore. Ok. I will change this. Thanks for reviewing the patches. Thomas.
diff --git a/drivers/tty/serial/s5pv210.c b/drivers/tty/serial/s5pv210.c index d6b2423..3b2021a 100644 --- a/drivers/tty/serial/s5pv210.c +++ b/drivers/tty/serial/s5pv210.c @@ -27,9 +27,13 @@ static int s5pv210_serial_setsource(struct uart_port *port, struct s3c24xx_uart_clksrc *clk) { - struct s3c2410_uartcfg *cfg = port->dev->platform_data; + struct s3c24xx_uart_port *ourport; + struct s3c2410_uartcfg *cfg; unsigned long ucon = rd_regl(port, S3C2410_UCON); + ourport = container_of(port, struct s3c24xx_uart_port, port); + cfg = &ourport->info->cfg; + if ((cfg->clocks_size) == 1) return 0; @@ -50,9 +54,13 @@ static int s5pv210_serial_setsource(struct uart_port *port, static int s5pv210_serial_getsource(struct uart_port *port, struct s3c24xx_uart_clksrc *clk) { - struct s3c2410_uartcfg *cfg = port->dev->platform_data; + struct s3c24xx_uart_port *ourport; + struct s3c2410_uartcfg *cfg; u32 ucon = rd_regl(port, S3C2410_UCON); + ourport = container_of(port, struct s3c24xx_uart_port, port); + cfg = &ourport->info->cfg; + clk->divisor = 1; if ((cfg->clocks_size) == 1) diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index 7ead421..77d900f 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -42,6 +42,7 @@ #include <linux/delay.h> #include <linux/clk.h> #include <linux/cpufreq.h> +#include <linux/slab.h> #include <asm/irq.h> @@ -169,10 +170,13 @@ static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *p static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port) { + struct s3c24xx_uart_port *ourport; + if (port->dev == NULL) return NULL; - return (struct s3c2410_uartcfg *)port->dev->platform_data; + ourport = container_of(port, struct s3c24xx_uart_port, port); + return &ourport->info->cfg; } static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport, @@ -1053,7 +1057,7 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, struct platform_device *platdev) { struct uart_port *port = &ourport->port; - struct s3c2410_uartcfg *cfg; + struct s3c2410_uartcfg *cfg = platdev->dev.platform_data; struct resource *res; int ret; @@ -1062,14 +1066,24 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, if (platdev == NULL) return -ENODEV; - cfg = s3c24xx_dev_to_cfg(&platdev->dev); - if (port->mapbase != 0) return 0; + if (cfg) { + memcpy((void *)&info->cfg, cfg, sizeof(struct s3c2410_uartcfg)); + info->cfg.clocks = kzalloc(sizeof(struct s3c24xx_uart_clksrc) * + cfg->clocks_size, GFP_KERNEL); + if (!info->cfg.clocks) + return -ENOMEM; + memcpy(info->cfg.clocks, cfg->clocks, + sizeof(struct s3c24xx_uart_clksrc) * cfg->clocks_size); + } + + cfg = &info->cfg; if (cfg->hwport > CONFIG_SERIAL_SAMSUNG_UARTS) { printk(KERN_ERR "%s: port %d bigger than %d\n", __func__, cfg->hwport, CONFIG_SERIAL_SAMSUNG_UARTS); + kfree(info->cfg.clocks); return -ERANGE; } @@ -1181,11 +1195,13 @@ EXPORT_SYMBOL_GPL(s3c24xx_serial_probe); int __devexit s3c24xx_serial_remove(struct platform_device *dev) { struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); if (port) { s3c24xx_serial_cpufreq_deregister(to_ourport(port)); device_remove_file(&dev->dev, &dev_attr_clock_source); uart_remove_one_port(&s3c24xx_uart_drv, port); + kfree(info->cfg.clocks); } return 0; diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h index a69d9a5..4f2f6f5 100644 --- a/drivers/tty/serial/samsung.h +++ b/drivers/tty/serial/samsung.h @@ -24,6 +24,9 @@ struct s3c24xx_uart_info { unsigned int has_divslot:1; + /* copy of platform data */ + struct s3c2410_uartcfg cfg; + /* clock source control */ int (*get_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk); @@ -56,7 +59,6 @@ struct s3c24xx_uart_port { /* conversion functions */ #define s3c24xx_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev) -#define s3c24xx_dev_to_cfg(__dev) (struct s3c2410_uartcfg *)((__dev)->platform_data) /* register access controls */
The driver depends on pdev->dev.platform_data to retrive information about the platform data even after the initialization. To add device tree support, this has to be changed in way that the platform data is avialable from driver's private data. This patch adds support for keeping a copy of the plaform data in s3c24xx_uart_info and using it when needed after the initialization. Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> --- drivers/tty/serial/s5pv210.c | 12 ++++++++++-- drivers/tty/serial/samsung.c | 24 ++++++++++++++++++++---- drivers/tty/serial/samsung.h | 4 +++- 3 files changed, 33 insertions(+), 7 deletions(-)