| Message ID | 20220929143225.17907-6-hal.feng@linux.starfivetech.com |
|---|---|
| State | New |
| Headers | show |
| Series | Basic StarFive JH7110 RISC-V SoC support | expand |
On Thu, 29 Sept 2022 at 19:59, Ben Dooks <ben.dooks@sifive.com> wrote: > > On 29/09/2022 15:32, Hal Feng wrote: > > From: Emil Renner Berthing <kernel@esmil.dk> > > > > This converts the driver to use the builtin_platform_driver_probe macro > > to initialize the driver. This macro ends up calling device_initcall as > > was used previously, but also allocates a platform device which gives us > > access to much nicer APIs such as platform_ioremap_resource, > > platform_get_irq and dev_err_probe. > > This is useful, but also there are other changes currently being sorted > out by Zong Li (cc'd into this message) which have already been reviewed > and are hopefully queued for the next kernel release. > > > Signed-off-by: Emil Renner Berthing <kernel@esmil.dk> > > Signed-off-by: Hal Feng <hal.feng@linux.starfivetech.com> I'm ok with something like this being merged, but please note that if we ever want to support the JH7100 which uses registers in this peripheral to flush the cache for its non-coherent DMAs then this driver needs to be loaded before other peripherals or we will trigger the 2nd warning in arch/riscv/mm/dma-noncoherent.c. I'm not sure we can do that when it's a platform driver. See this patch for an alternative to support the JH71x0s: https://github.com/esmil/linux/commit/9c5b29da56ae29159c9572c5bb195fe3a1b535c5 /Emil > > drivers/soc/sifive/sifive_l2_cache.c | 79 ++++++++++++++-------------- > > 1 file changed, 40 insertions(+), 39 deletions(-) > > > > diff --git a/drivers/soc/sifive/sifive_l2_cache.c b/drivers/soc/sifive/sifive_l2_cache.c > > index 59640a1d0b28..010d612f7420 100644 > > --- a/drivers/soc/sifive/sifive_l2_cache.c > > +++ b/drivers/soc/sifive/sifive_l2_cache.c > > @@ -7,9 +7,9 @@ > > */ > > #include <linux/debugfs.h> > > #include <linux/interrupt.h> > > -#include <linux/of_irq.h> > > -#include <linux/of_address.h> > > -#include <linux/device.h> > > +#include <linux/io.h> > > +#include <linux/mod_devicetable.h> > > +#include <linux/platform_device.h> > > #include <asm/cacheinfo.h> > > #include <soc/sifive/sifive_l2_cache.h> > > > > @@ -96,12 +96,6 @@ static void l2_config_read(void) > > pr_info("L2CACHE: Index of the largest way enabled: %d\n", regval); > > } > > > > -static const struct of_device_id sifive_l2_ids[] = { > > - { .compatible = "sifive,fu540-c000-ccache" }, > > - { .compatible = "sifive,fu740-c000-ccache" }, > > - { /* end of table */ }, > > -}; > > - > > static ATOMIC_NOTIFIER_HEAD(l2_err_chain); > > > > int register_sifive_l2_error_notifier(struct notifier_block *nb) > > @@ -192,36 +186,29 @@ static irqreturn_t l2_int_handler(int irq, void *device) > > return IRQ_HANDLED; > > } > > > > -static int __init sifive_l2_init(void) > > +static int __init sifive_l2_probe(struct platform_device *pdev) > > { > > - struct device_node *np; > > - struct resource res; > > - int i, rc, intr_num; > > - > > - np = of_find_matching_node(NULL, sifive_l2_ids); > > - if (!np) > > - return -ENODEV; > > - > > - if (of_address_to_resource(np, 0, &res)) > > - return -ENODEV; > > - > > - l2_base = ioremap(res.start, resource_size(&res)); > > - if (!l2_base) > > - return -ENOMEM; > > - > > - intr_num = of_property_count_u32_elems(np, "interrupts"); > > - if (!intr_num) { > > - pr_err("L2CACHE: no interrupts property\n"); > > - return -ENODEV; > > - } > > - > > - for (i = 0; i < intr_num; i++) { > > - g_irq[i] = irq_of_parse_and_map(np, i); > > - rc = request_irq(g_irq[i], l2_int_handler, 0, "l2_ecc", NULL); > > - if (rc) { > > - pr_err("L2CACHE: Could not request IRQ %d\n", g_irq[i]); > > - return rc; > > - } > > + struct device *dev = &pdev->dev; > > + int nirqs; > > + int ret; > > + int i; > > + > > + l2_base = devm_platform_ioremap_resource(pdev, 0); > > + if (IS_ERR(l2_base)) > > + return PTR_ERR(l2_base); > > + > > + nirqs = platform_irq_count(pdev); > > + if (nirqs <= 0) > > + return dev_err_probe(dev, -ENODEV, "no interrupts\n"); > > I wonder if zero irqs is an actual issue here? > > > + for (i = 0; i < nirqs; i++) { > > + g_irq[i] = platform_get_irq(pdev, i); > > I wonder if we need to keep g_irq[] around now? Is it going to be useful > in the future? > > > + if (g_irq[i] < 0) > > + return g_irq[i]; > > + > > + ret = devm_request_irq(dev, g_irq[i], l2_int_handler, 0, pdev->name, NULL); > > + if (ret) > > + return dev_err_probe(dev, ret, "Could not request IRQ %d\n", g_irq[i]); > > } > > > > l2_config_read(); > > @@ -234,4 +221,18 @@ static int __init sifive_l2_init(void) > > #endif > > return 0; > > } > > -device_initcall(sifive_l2_init); > > + > > +static const struct of_device_id sifive_l2_match[] = { > > + { .compatible = "sifive,fu540-c000-ccache" }, > > + { .compatible = "sifive,fu740-c000-ccache" }, > > + { /* sentinel */ } > > +}; > > + > > +static struct platform_driver sifive_l2_driver = { > > + .driver = { > > + .name = "sifive_l2_cache", > > + .of_match_table = sifive_l2_match, > > + .suppress_bind_attrs = true, > > + }, > > +}; > > +builtin_platform_driver_probe(sifive_l2_driver, sifive_l2_probe); > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv
On 05/10/2022 14:44, Emil Renner Berthing wrote: > On Thu, 29 Sept 2022 at 19:59, Ben Dooks <ben.dooks@sifive.com> wrote: >> >> On 29/09/2022 15:32, Hal Feng wrote: >>> From: Emil Renner Berthing <kernel@esmil.dk> >>> >>> This converts the driver to use the builtin_platform_driver_probe macro >>> to initialize the driver. This macro ends up calling device_initcall as >>> was used previously, but also allocates a platform device which gives us >>> access to much nicer APIs such as platform_ioremap_resource, >>> platform_get_irq and dev_err_probe. >> >> This is useful, but also there are other changes currently being sorted >> out by Zong Li (cc'd into this message) which have already been reviewed >> and are hopefully queued for the next kernel release. >> >>> Signed-off-by: Emil Renner Berthing <kernel@esmil.dk> >>> Signed-off-by: Hal Feng <hal.feng@linux.starfivetech.com> > > I'm ok with something like this being merged, but please note that if > we ever want to support the JH7100 which uses registers in this > peripheral to flush the cache for its non-coherent DMAs then this > driver needs to be loaded before other peripherals or we will trigger > the 2nd warning in arch/riscv/mm/dma-noncoherent.c. I'm not sure we > can do that when it's a platform driver. See this patch for an > alternative to support the JH71x0s: > https://github.com/esmil/linux/commit/9c5b29da56ae29159c9572c5bb195fe3a1b535c5 > > /Emil Are you replying to your own patch that does the conversion to platform driver and then saying that it could actually cause issues? I'm all for dropping this for the moment and keeping the old early init for the ccache. >>> drivers/soc/sifive/sifive_l2_cache.c | 79 ++++++++++++++-------------- >>> 1 file changed, 40 insertions(+), 39 deletions(-) >>> >>> diff --git a/drivers/soc/sifive/sifive_l2_cache.c b/drivers/soc/sifive/sifive_l2_cache.c >>> index 59640a1d0b28..010d612f7420 100644 >>> --- a/drivers/soc/sifive/sifive_l2_cache.c >>> +++ b/drivers/soc/sifive/sifive_l2_cache.c >>> @@ -7,9 +7,9 @@ >>> */ >>> #include <linux/debugfs.h> >>> #include <linux/interrupt.h> >>> -#include <linux/of_irq.h> >>> -#include <linux/of_address.h> >>> -#include <linux/device.h> >>> +#include <linux/io.h> >>> +#include <linux/mod_devicetable.h> >>> +#include <linux/platform_device.h> >>> #include <asm/cacheinfo.h> >>> #include <soc/sifive/sifive_l2_cache.h> >>> >>> @@ -96,12 +96,6 @@ static void l2_config_read(void) >>> pr_info("L2CACHE: Index of the largest way enabled: %d\n", regval); >>> } >>> >>> -static const struct of_device_id sifive_l2_ids[] = { >>> - { .compatible = "sifive,fu540-c000-ccache" }, >>> - { .compatible = "sifive,fu740-c000-ccache" }, >>> - { /* end of table */ }, >>> -}; >>> - >>> static ATOMIC_NOTIFIER_HEAD(l2_err_chain); >>> >>> int register_sifive_l2_error_notifier(struct notifier_block *nb) >>> @@ -192,36 +186,29 @@ static irqreturn_t l2_int_handler(int irq, void *device) >>> return IRQ_HANDLED; >>> } >>> >>> -static int __init sifive_l2_init(void) >>> +static int __init sifive_l2_probe(struct platform_device *pdev) >>> { >>> - struct device_node *np; >>> - struct resource res; >>> - int i, rc, intr_num; >>> - >>> - np = of_find_matching_node(NULL, sifive_l2_ids); >>> - if (!np) >>> - return -ENODEV; >>> - >>> - if (of_address_to_resource(np, 0, &res)) >>> - return -ENODEV; >>> - >>> - l2_base = ioremap(res.start, resource_size(&res)); >>> - if (!l2_base) >>> - return -ENOMEM; >>> - >>> - intr_num = of_property_count_u32_elems(np, "interrupts"); >>> - if (!intr_num) { >>> - pr_err("L2CACHE: no interrupts property\n"); >>> - return -ENODEV; >>> - } >>> - >>> - for (i = 0; i < intr_num; i++) { >>> - g_irq[i] = irq_of_parse_and_map(np, i); >>> - rc = request_irq(g_irq[i], l2_int_handler, 0, "l2_ecc", NULL); >>> - if (rc) { >>> - pr_err("L2CACHE: Could not request IRQ %d\n", g_irq[i]); >>> - return rc; >>> - } >>> + struct device *dev = &pdev->dev; >>> + int nirqs; >>> + int ret; >>> + int i; >>> + >>> + l2_base = devm_platform_ioremap_resource(pdev, 0); >>> + if (IS_ERR(l2_base)) >>> + return PTR_ERR(l2_base); >>> + >>> + nirqs = platform_irq_count(pdev); >>> + if (nirqs <= 0) >>> + return dev_err_probe(dev, -ENODEV, "no interrupts\n"); >> >> I wonder if zero irqs is an actual issue here? >> >>> + for (i = 0; i < nirqs; i++) { >>> + g_irq[i] = platform_get_irq(pdev, i); >> >> I wonder if we need to keep g_irq[] around now? Is it going to be useful >> in the future? >> >>> + if (g_irq[i] < 0) >>> + return g_irq[i]; >>> + >>> + ret = devm_request_irq(dev, g_irq[i], l2_int_handler, 0, pdev->name, NULL); >>> + if (ret) >>> + return dev_err_probe(dev, ret, "Could not request IRQ %d\n", g_irq[i]); >>> } >>> >>> l2_config_read(); >>> @@ -234,4 +221,18 @@ static int __init sifive_l2_init(void) >>> #endif >>> return 0; >>> } >>> -device_initcall(sifive_l2_init); >>> + >>> +static const struct of_device_id sifive_l2_match[] = { >>> + { .compatible = "sifive,fu540-c000-ccache" }, >>> + { .compatible = "sifive,fu740-c000-ccache" }, >>> + { /* sentinel */ } >>> +}; >>> + >>> +static struct platform_driver sifive_l2_driver = { >>> + .driver = { >>> + .name = "sifive_l2_cache", >>> + .of_match_table = sifive_l2_match, >>> + .suppress_bind_attrs = true, >>> + }, >>> +}; >>> +builtin_platform_driver_probe(sifive_l2_driver, sifive_l2_probe); >> >> >> _______________________________________________ >> linux-riscv mailing list >> linux-riscv@lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-riscv > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv >
On Wed, 5 Oct 2022 at 15:48, Ben Dooks <ben.dooks@codethink.co.uk> wrote: > > On 05/10/2022 14:44, Emil Renner Berthing wrote: > > On Thu, 29 Sept 2022 at 19:59, Ben Dooks <ben.dooks@sifive.com> wrote: > >> > >> On 29/09/2022 15:32, Hal Feng wrote: > >>> From: Emil Renner Berthing <kernel@esmil.dk> > >>> > >>> This converts the driver to use the builtin_platform_driver_probe macro > >>> to initialize the driver. This macro ends up calling device_initcall as > >>> was used previously, but also allocates a platform device which gives us > >>> access to much nicer APIs such as platform_ioremap_resource, > >>> platform_get_irq and dev_err_probe. > >> > >> This is useful, but also there are other changes currently being sorted > >> out by Zong Li (cc'd into this message) which have already been reviewed > >> and are hopefully queued for the next kernel release. > >> > >>> Signed-off-by: Emil Renner Berthing <kernel@esmil.dk> > >>> Signed-off-by: Hal Feng <hal.feng@linux.starfivetech.com> > > > > I'm ok with something like this being merged, but please note that if > > we ever want to support the JH7100 which uses registers in this > > peripheral to flush the cache for its non-coherent DMAs then this > > driver needs to be loaded before other peripherals or we will trigger > > the 2nd warning in arch/riscv/mm/dma-noncoherent.c. I'm not sure we > > can do that when it's a platform driver. See this patch for an > > alternative to support the JH71x0s: > > https://github.com/esmil/linux/commit/9c5b29da56ae29159c9572c5bb195fe3a1b535c5 > > > > /Emil > > Are you replying to your own patch that does the conversion to > platform driver and then saying that it could actually cause > issues? Yes, I can see it seems odd, but this patch lived for a while in the kernel repo for the JH7100 until I rebased on 6.0-rc1 and realized the above. Hal Feng must have based his patches on a version of the code before that when preparing this series. > I'm all for dropping this for the moment and keeping the old > early init for the ccache. Cool. /Emil > >>> drivers/soc/sifive/sifive_l2_cache.c | 79 ++++++++++++++-------------- > >>> 1 file changed, 40 insertions(+), 39 deletions(-) > >>> > >>> diff --git a/drivers/soc/sifive/sifive_l2_cache.c b/drivers/soc/sifive/sifive_l2_cache.c > >>> index 59640a1d0b28..010d612f7420 100644 > >>> --- a/drivers/soc/sifive/sifive_l2_cache.c > >>> +++ b/drivers/soc/sifive/sifive_l2_cache.c > >>> @@ -7,9 +7,9 @@ > >>> */ > >>> #include <linux/debugfs.h> > >>> #include <linux/interrupt.h> > >>> -#include <linux/of_irq.h> > >>> -#include <linux/of_address.h> > >>> -#include <linux/device.h> > >>> +#include <linux/io.h> > >>> +#include <linux/mod_devicetable.h> > >>> +#include <linux/platform_device.h> > >>> #include <asm/cacheinfo.h> > >>> #include <soc/sifive/sifive_l2_cache.h> > >>> > >>> @@ -96,12 +96,6 @@ static void l2_config_read(void) > >>> pr_info("L2CACHE: Index of the largest way enabled: %d\n", regval); > >>> } > >>> > >>> -static const struct of_device_id sifive_l2_ids[] = { > >>> - { .compatible = "sifive,fu540-c000-ccache" }, > >>> - { .compatible = "sifive,fu740-c000-ccache" }, > >>> - { /* end of table */ }, > >>> -}; > >>> - > >>> static ATOMIC_NOTIFIER_HEAD(l2_err_chain); > >>> > >>> int register_sifive_l2_error_notifier(struct notifier_block *nb) > >>> @@ -192,36 +186,29 @@ static irqreturn_t l2_int_handler(int irq, void *device) > >>> return IRQ_HANDLED; > >>> } > >>> > >>> -static int __init sifive_l2_init(void) > >>> +static int __init sifive_l2_probe(struct platform_device *pdev) > >>> { > >>> - struct device_node *np; > >>> - struct resource res; > >>> - int i, rc, intr_num; > >>> - > >>> - np = of_find_matching_node(NULL, sifive_l2_ids); > >>> - if (!np) > >>> - return -ENODEV; > >>> - > >>> - if (of_address_to_resource(np, 0, &res)) > >>> - return -ENODEV; > >>> - > >>> - l2_base = ioremap(res.start, resource_size(&res)); > >>> - if (!l2_base) > >>> - return -ENOMEM; > >>> - > >>> - intr_num = of_property_count_u32_elems(np, "interrupts"); > >>> - if (!intr_num) { > >>> - pr_err("L2CACHE: no interrupts property\n"); > >>> - return -ENODEV; > >>> - } > >>> - > >>> - for (i = 0; i < intr_num; i++) { > >>> - g_irq[i] = irq_of_parse_and_map(np, i); > >>> - rc = request_irq(g_irq[i], l2_int_handler, 0, "l2_ecc", NULL); > >>> - if (rc) { > >>> - pr_err("L2CACHE: Could not request IRQ %d\n", g_irq[i]); > >>> - return rc; > >>> - } > >>> + struct device *dev = &pdev->dev; > >>> + int nirqs; > >>> + int ret; > >>> + int i; > >>> + > >>> + l2_base = devm_platform_ioremap_resource(pdev, 0); > >>> + if (IS_ERR(l2_base)) > >>> + return PTR_ERR(l2_base); > >>> + > >>> + nirqs = platform_irq_count(pdev); > >>> + if (nirqs <= 0) > >>> + return dev_err_probe(dev, -ENODEV, "no interrupts\n"); > >> > >> I wonder if zero irqs is an actual issue here? > >> > >>> + for (i = 0; i < nirqs; i++) { > >>> + g_irq[i] = platform_get_irq(pdev, i); > >> > >> I wonder if we need to keep g_irq[] around now? Is it going to be useful > >> in the future? > >> > >>> + if (g_irq[i] < 0) > >>> + return g_irq[i]; > >>> + > >>> + ret = devm_request_irq(dev, g_irq[i], l2_int_handler, 0, pdev->name, NULL); > >>> + if (ret) > >>> + return dev_err_probe(dev, ret, "Could not request IRQ %d\n", g_irq[i]); > >>> } > >>> > >>> l2_config_read(); > >>> @@ -234,4 +221,18 @@ static int __init sifive_l2_init(void) > >>> #endif > >>> return 0; > >>> } > >>> -device_initcall(sifive_l2_init); > >>> + > >>> +static const struct of_device_id sifive_l2_match[] = { > >>> + { .compatible = "sifive,fu540-c000-ccache" }, > >>> + { .compatible = "sifive,fu740-c000-ccache" }, > >>> + { /* sentinel */ } > >>> +}; > >>> + > >>> +static struct platform_driver sifive_l2_driver = { > >>> + .driver = { > >>> + .name = "sifive_l2_cache", > >>> + .of_match_table = sifive_l2_match, > >>> + .suppress_bind_attrs = true, > >>> + }, > >>> +}; > >>> +builtin_platform_driver_probe(sifive_l2_driver, sifive_l2_probe); > >> > >> > >> _______________________________________________ > >> linux-riscv mailing list > >> linux-riscv@lists.infradead.org > >> http://lists.infradead.org/mailman/listinfo/linux-riscv > > > > _______________________________________________ > > linux-riscv mailing list > > linux-riscv@lists.infradead.org > > http://lists.infradead.org/mailman/listinfo/linux-riscv > > > > -- > Ben Dooks http://www.codethink.co.uk/ > Senior Engineer Codethink - Providing Genius > > https://www.codethink.co.uk/privacy.html >
On Wed, Oct 05, 2022 at 03:55:17PM +0200, Emil Renner Berthing wrote: > On Wed, 5 Oct 2022 at 15:48, Ben Dooks <ben.dooks@codethink.co.uk> wrote: > > > > On 05/10/2022 14:44, Emil Renner Berthing wrote: > > > On Thu, 29 Sept 2022 at 19:59, Ben Dooks <ben.dooks@sifive.com> wrote: > > >> > > >> On 29/09/2022 15:32, Hal Feng wrote: > > >>> From: Emil Renner Berthing <kernel@esmil.dk> > > >>> > > >>> This converts the driver to use the builtin_platform_driver_probe macro > > >>> to initialize the driver. This macro ends up calling device_initcall as > > >>> was used previously, but also allocates a platform device which gives us > > >>> access to much nicer APIs such as platform_ioremap_resource, > > >>> platform_get_irq and dev_err_probe. > > >> > > >> This is useful, but also there are other changes currently being sorted > > >> out by Zong Li (cc'd into this message) which have already been reviewed > > >> and are hopefully queued for the next kernel release. > > >> > > >>> Signed-off-by: Emil Renner Berthing <kernel@esmil.dk> > > >>> Signed-off-by: Hal Feng <hal.feng@linux.starfivetech.com> > > > > > > I'm ok with something like this being merged, but please note that if > > > we ever want to support the JH7100 which uses registers in this > > > peripheral to flush the cache for its non-coherent DMAs then this > > > driver needs to be loaded before other peripherals or we will trigger > > > the 2nd warning in arch/riscv/mm/dma-noncoherent.c. I'm not sure we > > > can do that when it's a platform driver. See this patch for an > > > alternative to support the JH71x0s: > > > https://github.com/esmil/linux/commit/9c5b29da56ae29159c9572c5bb195fe3a1b535c5 > > > > > > /Emil > > > > Are you replying to your own patch that does the conversion to > > platform driver and then saying that it could actually cause > > issues? > > Yes, I can see it seems odd, but this patch lived for a while in the > kernel repo for the JH7100 until I rebased on 6.0-rc1 and realized the > above. > Hal Feng must have based his patches on a version of the code before > that when preparing this series. > > > I'm all for dropping this for the moment and keeping the old > > early init for the ccache. > > Cool. FWIW, if converting to a platform driver will inhibit using the driver for doing non-coherent stuff I would like to NAK the patch :) > > /Emil > > > >>> drivers/soc/sifive/sifive_l2_cache.c | 79 ++++++++++++++-------------- > > >>> 1 file changed, 40 insertions(+), 39 deletions(-) > > >>> > > >>> diff --git a/drivers/soc/sifive/sifive_l2_cache.c b/drivers/soc/sifive/sifive_l2_cache.c > > >>> index 59640a1d0b28..010d612f7420 100644 > > >>> --- a/drivers/soc/sifive/sifive_l2_cache.c > > >>> +++ b/drivers/soc/sifive/sifive_l2_cache.c > > >>> @@ -7,9 +7,9 @@ > > >>> */ > > >>> #include <linux/debugfs.h> > > >>> #include <linux/interrupt.h> > > >>> -#include <linux/of_irq.h> > > >>> -#include <linux/of_address.h> > > >>> -#include <linux/device.h> > > >>> +#include <linux/io.h> > > >>> +#include <linux/mod_devicetable.h> > > >>> +#include <linux/platform_device.h> > > >>> #include <asm/cacheinfo.h> > > >>> #include <soc/sifive/sifive_l2_cache.h> > > >>> > > >>> @@ -96,12 +96,6 @@ static void l2_config_read(void) > > >>> pr_info("L2CACHE: Index of the largest way enabled: %d\n", regval); > > >>> } > > >>> > > >>> -static const struct of_device_id sifive_l2_ids[] = { > > >>> - { .compatible = "sifive,fu540-c000-ccache" }, > > >>> - { .compatible = "sifive,fu740-c000-ccache" }, > > >>> - { /* end of table */ }, > > >>> -}; > > >>> - > > >>> static ATOMIC_NOTIFIER_HEAD(l2_err_chain); > > >>> > > >>> int register_sifive_l2_error_notifier(struct notifier_block *nb) > > >>> @@ -192,36 +186,29 @@ static irqreturn_t l2_int_handler(int irq, void *device) > > >>> return IRQ_HANDLED; > > >>> } > > >>> > > >>> -static int __init sifive_l2_init(void) > > >>> +static int __init sifive_l2_probe(struct platform_device *pdev) > > >>> { > > >>> - struct device_node *np; > > >>> - struct resource res; > > >>> - int i, rc, intr_num; > > >>> - > > >>> - np = of_find_matching_node(NULL, sifive_l2_ids); > > >>> - if (!np) > > >>> - return -ENODEV; > > >>> - > > >>> - if (of_address_to_resource(np, 0, &res)) > > >>> - return -ENODEV; > > >>> - > > >>> - l2_base = ioremap(res.start, resource_size(&res)); > > >>> - if (!l2_base) > > >>> - return -ENOMEM; > > >>> - > > >>> - intr_num = of_property_count_u32_elems(np, "interrupts"); > > >>> - if (!intr_num) { > > >>> - pr_err("L2CACHE: no interrupts property\n"); > > >>> - return -ENODEV; > > >>> - } > > >>> - > > >>> - for (i = 0; i < intr_num; i++) { > > >>> - g_irq[i] = irq_of_parse_and_map(np, i); > > >>> - rc = request_irq(g_irq[i], l2_int_handler, 0, "l2_ecc", NULL); > > >>> - if (rc) { > > >>> - pr_err("L2CACHE: Could not request IRQ %d\n", g_irq[i]); > > >>> - return rc; > > >>> - } > > >>> + struct device *dev = &pdev->dev; > > >>> + int nirqs; > > >>> + int ret; > > >>> + int i; > > >>> + > > >>> + l2_base = devm_platform_ioremap_resource(pdev, 0); > > >>> + if (IS_ERR(l2_base)) > > >>> + return PTR_ERR(l2_base); > > >>> + > > >>> + nirqs = platform_irq_count(pdev); > > >>> + if (nirqs <= 0) > > >>> + return dev_err_probe(dev, -ENODEV, "no interrupts\n"); > > >> > > >> I wonder if zero irqs is an actual issue here? > > >> > > >>> + for (i = 0; i < nirqs; i++) { > > >>> + g_irq[i] = platform_get_irq(pdev, i); > > >> > > >> I wonder if we need to keep g_irq[] around now? Is it going to be useful > > >> in the future? > > >> > > >>> + if (g_irq[i] < 0) > > >>> + return g_irq[i]; > > >>> + > > >>> + ret = devm_request_irq(dev, g_irq[i], l2_int_handler, 0, pdev->name, NULL); > > >>> + if (ret) > > >>> + return dev_err_probe(dev, ret, "Could not request IRQ %d\n", g_irq[i]); > > >>> } > > >>> > > >>> l2_config_read(); > > >>> @@ -234,4 +221,18 @@ static int __init sifive_l2_init(void) > > >>> #endif > > >>> return 0; > > >>> } > > >>> -device_initcall(sifive_l2_init); > > >>> + > > >>> +static const struct of_device_id sifive_l2_match[] = { > > >>> + { .compatible = "sifive,fu540-c000-ccache" }, > > >>> + { .compatible = "sifive,fu740-c000-ccache" }, > > >>> + { /* sentinel */ } > > >>> +}; > > >>> + > > >>> +static struct platform_driver sifive_l2_driver = { > > >>> + .driver = { > > >>> + .name = "sifive_l2_cache", > > >>> + .of_match_table = sifive_l2_match, > > >>> + .suppress_bind_attrs = true, > > >>> + }, > > >>> +}; > > >>> +builtin_platform_driver_probe(sifive_l2_driver, sifive_l2_probe); > > >> > > >> > > >> _______________________________________________ > > >> linux-riscv mailing list > > >> linux-riscv@lists.infradead.org > > >> http://lists.infradead.org/mailman/listinfo/linux-riscv > > > > > > _______________________________________________ > > > linux-riscv mailing list > > > linux-riscv@lists.infradead.org > > > http://lists.infradead.org/mailman/listinfo/linux-riscv > > > > > > > -- > > Ben Dooks http://www.codethink.co.uk/ > > Senior Engineer Codethink - Providing Genius > > > > https://www.codethink.co.uk/privacy.html > >
On Wed, 5 Oct 2022 15:05:03 +0100, Conor Dooley wrote: > On Wed, Oct 05, 2022 at 03:55:17PM +0200, Emil Renner Berthing wrote: > > On Wed, 5 Oct 2022 at 15:48, Ben Dooks <ben.dooks@codethink.co.uk> wrote: > > > > > > On 05/10/2022 14:44, Emil Renner Berthing wrote: > > > > On Thu, 29 Sept 2022 at 19:59, Ben Dooks <ben.dooks@sifive.com> wrote: > > > >> > > > >> On 29/09/2022 15:32, Hal Feng wrote: > > > >>> From: Emil Renner Berthing <kernel@esmil.dk> > > > >>> > > > >>> This converts the driver to use the builtin_platform_driver_probe macro > > > >>> to initialize the driver. This macro ends up calling device_initcall as > > > >>> was used previously, but also allocates a platform device which gives us > > > >>> access to much nicer APIs such as platform_ioremap_resource, > > > >>> platform_get_irq and dev_err_probe. > > > >> > > > >> This is useful, but also there are other changes currently being sorted > > > >> out by Zong Li (cc'd into this message) which have already been reviewed > > > >> and are hopefully queued for the next kernel release. > > > >> > > > >>> Signed-off-by: Emil Renner Berthing <kernel@esmil.dk> > > > >>> Signed-off-by: Hal Feng <hal.feng@linux.starfivetech.com> > > > > > > > > I'm ok with something like this being merged, but please note that if > > > > we ever want to support the JH7100 which uses registers in this > > > > peripheral to flush the cache for its non-coherent DMAs then this > > > > driver needs to be loaded before other peripherals or we will trigger > > > > the 2nd warning in arch/riscv/mm/dma-noncoherent.c. I'm not sure we > > > > can do that when it's a platform driver. See this patch for an > > > > alternative to support the JH71x0s: > > > > https://github.com/esmil/linux/commit/9c5b29da56ae29159c9572c5bb195fe3a1b535c5 > > > > > > > > /Emil > > > > > > Are you replying to your own patch that does the conversion to > > > platform driver and then saying that it could actually cause > > > issues? > > > > Yes, I can see it seems odd, but this patch lived for a while in the > > kernel repo for the JH7100 until I rebased on 6.0-rc1 and realized the > > above. > > Hal Feng must have based his patches on a version of the code before > > that when preparing this series. > > > > > I'm all for dropping this for the moment and keeping the old > > > early init for the ccache. > > > > Cool. > > FWIW, if converting to a platform driver will inhibit using the driver > for doing non-coherent stuff I would like to NAK the patch :) > Yeah, I agree, and this patch will be dropped on the next version.
diff --git a/drivers/soc/sifive/sifive_l2_cache.c b/drivers/soc/sifive/sifive_l2_cache.c index 59640a1d0b28..010d612f7420 100644 --- a/drivers/soc/sifive/sifive_l2_cache.c +++ b/drivers/soc/sifive/sifive_l2_cache.c @@ -7,9 +7,9 @@ */ #include <linux/debugfs.h> #include <linux/interrupt.h> -#include <linux/of_irq.h> -#include <linux/of_address.h> -#include <linux/device.h> +#include <linux/io.h> +#include <linux/mod_devicetable.h> +#include <linux/platform_device.h> #include <asm/cacheinfo.h> #include <soc/sifive/sifive_l2_cache.h> @@ -96,12 +96,6 @@ static void l2_config_read(void) pr_info("L2CACHE: Index of the largest way enabled: %d\n", regval); } -static const struct of_device_id sifive_l2_ids[] = { - { .compatible = "sifive,fu540-c000-ccache" }, - { .compatible = "sifive,fu740-c000-ccache" }, - { /* end of table */ }, -}; - static ATOMIC_NOTIFIER_HEAD(l2_err_chain); int register_sifive_l2_error_notifier(struct notifier_block *nb) @@ -192,36 +186,29 @@ static irqreturn_t l2_int_handler(int irq, void *device) return IRQ_HANDLED; } -static int __init sifive_l2_init(void) +static int __init sifive_l2_probe(struct platform_device *pdev) { - struct device_node *np; - struct resource res; - int i, rc, intr_num; - - np = of_find_matching_node(NULL, sifive_l2_ids); - if (!np) - return -ENODEV; - - if (of_address_to_resource(np, 0, &res)) - return -ENODEV; - - l2_base = ioremap(res.start, resource_size(&res)); - if (!l2_base) - return -ENOMEM; - - intr_num = of_property_count_u32_elems(np, "interrupts"); - if (!intr_num) { - pr_err("L2CACHE: no interrupts property\n"); - return -ENODEV; - } - - for (i = 0; i < intr_num; i++) { - g_irq[i] = irq_of_parse_and_map(np, i); - rc = request_irq(g_irq[i], l2_int_handler, 0, "l2_ecc", NULL); - if (rc) { - pr_err("L2CACHE: Could not request IRQ %d\n", g_irq[i]); - return rc; - } + struct device *dev = &pdev->dev; + int nirqs; + int ret; + int i; + + l2_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(l2_base)) + return PTR_ERR(l2_base); + + nirqs = platform_irq_count(pdev); + if (nirqs <= 0) + return dev_err_probe(dev, -ENODEV, "no interrupts\n"); + + for (i = 0; i < nirqs; i++) { + g_irq[i] = platform_get_irq(pdev, i); + if (g_irq[i] < 0) + return g_irq[i]; + + ret = devm_request_irq(dev, g_irq[i], l2_int_handler, 0, pdev->name, NULL); + if (ret) + return dev_err_probe(dev, ret, "Could not request IRQ %d\n", g_irq[i]); } l2_config_read(); @@ -234,4 +221,18 @@ static int __init sifive_l2_init(void) #endif return 0; } -device_initcall(sifive_l2_init); + +static const struct of_device_id sifive_l2_match[] = { + { .compatible = "sifive,fu540-c000-ccache" }, + { .compatible = "sifive,fu740-c000-ccache" }, + { /* sentinel */ } +}; + +static struct platform_driver sifive_l2_driver = { + .driver = { + .name = "sifive_l2_cache", + .of_match_table = sifive_l2_match, + .suppress_bind_attrs = true, + }, +}; +builtin_platform_driver_probe(sifive_l2_driver, sifive_l2_probe);