From: "Pandita, Vikram" <vikram.pandita@ti.com> To: Tony Lindgren <tony@atomide.com>, Russell King - ARM Linux <linux@arm.linux.org.uk> Cc: "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, "linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org> Subject: RE: [PATCH 2/4] omap: Make uncompress code and DEBUG_LL code generic Date: Tue, 19 Jan 2010 07:20:20 +0530 [thread overview] Message-ID: <FCCFB4CDC6E5564B9182F639FC356087030070F296@dbde02.ent.ti.com> (raw) In-Reply-To: <20100116200003.GL10318@atomide.com> >-----Original Message----- >From: linux-omap-owner@vger.kernel.org [mailto:linux-omap-owner@vger.kernel.org] On Behalf Of Tony >Lindgren >Sent: Saturday, January 16, 2010 2:00 PM >To: Russell King - ARM Linux >Cc: linux-arm-kernel@lists.infradead.org; linux-omap@vger.kernel.org >Subject: Re: [PATCH 2/4] omap: Make uncompress code and DEBUG_LL code generic > >* Russell King - ARM Linux <linux@arm.linux.org.uk> [100116 11:31]: >> On Sat, Jan 16, 2010 at 11:18:20AM -0800, Tony Lindgren wrote: >> > * Russell King - ARM Linux <linux@arm.linux.org.uk> [100116 01:33]: >> > > On Fri, Jan 15, 2010 at 05:35:15PM -0800, Tony Lindgren wrote: >> > > > diff --git a/arch/arm/mach-omap1/include/mach/debug-macro.S b/arch/arm/mach- >omap1/include/mach/debug-macro.S >> > > > index 23e4724..0174858 100644 >> > > > --- a/arch/arm/mach-omap1/include/mach/debug-macro.S >> > > > +++ b/arch/arm/mach-omap1/include/mach/debug-macro.S >> > > > @@ -15,18 +15,71 @@ >> > > > >> > > > #include <plat/serial.h> >> > > > >> > > > +omap_uart_phys: .word 0x0 >> > > > +omap_uart_virt: .word 0x0 >> > > >> > > I assume that you have no plans for XIP kernel support on OMAP, since >> > > these will be placed in the .text section, and is therefore read-only >> > > on XIP kernels. >> > >> > Did not think of that.. Maybe some addruart_premable solution here would. >> > Or adding \tmp register for addruart and just do the detection for each >> > character. >> >> How does doing it per-character help? The code is: >> >> ENTRY(printascii) >> addruart r3 >> b 2f >> 1: waituart r2, r3 >> senduart r1, r3 >> busyuart r2, r3 >> teq r1, #'\n' >> moveq r1, #'\r' >> beq 1b >> 2: teq r0, #0 >> ldrneb r1, [r0], #1 >> teqne r1, #0 >> bne 1b >> mov pc, lr >> >> Your wait/send/busy macros are just using the already provided base >> address which comes via r3 from addruart. That much is fine. >> >> I'm at a loss to understand why you think moving the address-getting >> functionality out of addruart into the individual wait/send/busy >> macros is going to help in any way. > >Sorry, I meant doing the detection each time addruart is run, not >for each character. > >> Why not do something like this: >> >> .pushsection .data >> omap_uart_phys: .word 0 >> omap_uart_virt: .word 0 Also We may need a: omap_uart_shift: .word 0 Since shift also varies depending on different omap boards (external debug board shift=1, internal omap has shift=2) Bingo..I think this was the key solution to the problem. I had posted long ago similar kind of implementation [1] and I wish rmk had given this nice idea then :) [1] http://marc.info/?l=linux-omap&m=125269221820632&w=2 See this part: + .align + .type __phy_uart_addr, #object +__phy_uart_addr: .word 0xFF + .type __virt_uart_addr, #object +__virt_uart_addr: .word 0xFF >> .popsection >> >> .macro addruart, rx >> ... >> + ldreq \rx, =omap_uart_phys @ physical base address >> + ldrne \rx, =omap_uart_virt @ virtual base >> ldr \rx, [\rx] >> + cmp \rx, #0 @ is port configured? >> + bne 99f @ already configured >> ... >> >> ? > >Sounds good to me. Will play with them and post refreshed patches. > >Regards, > >Tony >-- >To unsubscribe from this list: send the line "unsubscribe linux-omap" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html
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From: vikram.pandita@ti.com (Pandita, Vikram) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 2/4] omap: Make uncompress code and DEBUG_LL code generic Date: Tue, 19 Jan 2010 07:20:20 +0530 [thread overview] Message-ID: <FCCFB4CDC6E5564B9182F639FC356087030070F296@dbde02.ent.ti.com> (raw) In-Reply-To: <20100116200003.GL10318@atomide.com> >-----Original Message----- From: linux-omap-owner@vger.kernel.org [mailto:linux-omap-owner at vger.kernel.org] On Behalf Of Tony >Lindgren >Sent: Saturday, January 16, 2010 2:00 PM >To: Russell King - ARM Linux >Cc: linux-arm-kernel at lists.infradead.org; linux-omap at vger.kernel.org >Subject: Re: [PATCH 2/4] omap: Make uncompress code and DEBUG_LL code generic > >* Russell King - ARM Linux <linux@arm.linux.org.uk> [100116 11:31]: >> On Sat, Jan 16, 2010 at 11:18:20AM -0800, Tony Lindgren wrote: >> > * Russell King - ARM Linux <linux@arm.linux.org.uk> [100116 01:33]: >> > > On Fri, Jan 15, 2010 at 05:35:15PM -0800, Tony Lindgren wrote: >> > > > diff --git a/arch/arm/mach-omap1/include/mach/debug-macro.S b/arch/arm/mach- >omap1/include/mach/debug-macro.S >> > > > index 23e4724..0174858 100644 >> > > > --- a/arch/arm/mach-omap1/include/mach/debug-macro.S >> > > > +++ b/arch/arm/mach-omap1/include/mach/debug-macro.S >> > > > @@ -15,18 +15,71 @@ >> > > > >> > > > #include <plat/serial.h> >> > > > >> > > > +omap_uart_phys: .word 0x0 >> > > > +omap_uart_virt: .word 0x0 >> > > >> > > I assume that you have no plans for XIP kernel support on OMAP, since >> > > these will be placed in the .text section, and is therefore read-only >> > > on XIP kernels. >> > >> > Did not think of that.. Maybe some addruart_premable solution here would. >> > Or adding \tmp register for addruart and just do the detection for each >> > character. >> >> How does doing it per-character help? The code is: >> >> ENTRY(printascii) >> addruart r3 >> b 2f >> 1: waituart r2, r3 >> senduart r1, r3 >> busyuart r2, r3 >> teq r1, #'\n' >> moveq r1, #'\r' >> beq 1b >> 2: teq r0, #0 >> ldrneb r1, [r0], #1 >> teqne r1, #0 >> bne 1b >> mov pc, lr >> >> Your wait/send/busy macros are just using the already provided base >> address which comes via r3 from addruart. That much is fine. >> >> I'm at a loss to understand why you think moving the address-getting >> functionality out of addruart into the individual wait/send/busy >> macros is going to help in any way. > >Sorry, I meant doing the detection each time addruart is run, not >for each character. > >> Why not do something like this: >> >> .pushsection .data >> omap_uart_phys: .word 0 >> omap_uart_virt: .word 0 Also We may need a: omap_uart_shift: .word 0 Since shift also varies depending on different omap boards (external debug board shift=1, internal omap has shift=2) Bingo..I think this was the key solution to the problem. I had posted long ago similar kind of implementation [1] and I wish rmk had given this nice idea then :) [1] http://marc.info/?l=linux-omap&m=125269221820632&w=2 See this part: + .align + .type __phy_uart_addr, #object +__phy_uart_addr: .word 0xFF + .type __virt_uart_addr, #object +__virt_uart_addr: .word 0xFF >> .popsection >> >> .macro addruart, rx >> ... >> + ldreq \rx, =omap_uart_phys @ physical base address >> + ldrne \rx, =omap_uart_virt @ virtual base >> ldr \rx, [\rx] >> + cmp \rx, #0 @ is port configured? >> + bne 99f @ already configured >> ... >> >> ? > >Sounds good to me. Will play with them and post refreshed patches. > >Regards, > >Tony >-- >To unsubscribe from this list: send the line "unsubscribe linux-omap" in >the body of a message to majordomo at vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2010-01-19 1:50 UTC|newest] Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-01-16 1:35 [PATCH 0/4] omap multiboot improvments for merge window after 2.6.34 Tony Lindgren 2010-01-16 1:35 ` Tony Lindgren 2010-01-16 1:35 ` [PATCH 1/4] omap: Clean the serial port defines Tony Lindgren 2010-01-16 1:35 ` Tony Lindgren 2010-01-16 7:48 ` Shilimkar, Santosh 2010-01-16 7:48 ` Shilimkar, Santosh 2010-01-16 19:25 ` Tony Lindgren 2010-01-16 19:25 ` Tony Lindgren 2010-01-16 19:33 ` Shilimkar, Santosh 2010-01-16 19:33 ` Shilimkar, Santosh 2010-01-16 20:03 ` Tony Lindgren 2010-01-16 20:03 ` Tony Lindgren 2010-01-19 0:39 ` Pandita, Vikram 2010-01-19 0:39 ` Pandita, Vikram 2010-01-20 23:10 ` Tony Lindgren 2010-01-20 23:10 ` Tony Lindgren 2010-01-16 1:35 ` [PATCH 2/4] omap: Make uncompress code and DEBUG_LL code generic Tony Lindgren 2010-01-16 1:35 ` Tony Lindgren 2010-01-16 9:35 ` Russell King - ARM Linux 2010-01-16 9:35 ` Russell King - ARM Linux 2010-01-16 19:18 ` Tony Lindgren 2010-01-16 19:18 ` Tony Lindgren 2010-01-16 19:33 ` Russell King - ARM Linux 2010-01-16 19:33 ` Russell King - ARM Linux 2010-01-16 20:00 ` Tony Lindgren 2010-01-16 20:00 ` Tony Lindgren 2010-01-19 1:50 ` Pandita, Vikram [this message] 2010-01-19 1:50 ` Pandita, Vikram 2010-01-22 3:07 ` [PATCH 2/4] omap: Make uncompress code and DEBUG_LL code generic, v2 Tony Lindgren 2010-01-22 3:07 ` Tony Lindgren 2010-01-22 14:48 ` Pandita, Vikram 2010-01-22 14:48 ` Pandita, Vikram 2010-01-22 20:55 ` Tony Lindgren 2010-01-22 20:55 ` Tony Lindgren 2010-01-22 20:58 ` Pandita, Vikram 2010-01-22 20:58 ` Pandita, Vikram 2010-01-22 21:10 ` Tony Lindgren 2010-01-22 21:10 ` Tony Lindgren 2010-01-22 23:10 ` Pandita, Vikram 2010-01-22 23:10 ` Pandita, Vikram 2010-01-23 17:13 ` Tony Lindgren 2010-01-23 17:13 ` Tony Lindgren 2010-01-21 19:03 ` [PATCH 2/4] omap: Make uncompress code and DEBUG_LL code generic Tony Lindgren 2010-01-21 19:03 ` Tony Lindgren 2010-01-16 11:04 ` Shilimkar, Santosh 2010-01-16 11:04 ` Shilimkar, Santosh 2010-01-16 19:20 ` Tony Lindgren 2010-01-16 19:20 ` Tony Lindgren 2010-01-16 19:34 ` Shilimkar, Santosh 2010-01-16 19:34 ` Shilimkar, Santosh 2010-01-19 1:26 ` Pandita, Vikram 2010-01-19 1:26 ` Pandita, Vikram 2010-01-19 17:19 ` Kevin Hilman 2010-01-19 17:19 ` Kevin Hilman 2010-01-26 17:22 ` Tony Lindgren 2010-01-26 17:22 ` Tony Lindgren 2010-01-16 1:35 ` [PATCH 3/4] omap: Remove old DEBUG_LL serial port options Tony Lindgren 2010-01-16 1:35 ` Tony Lindgren 2010-01-16 1:35 ` [PATCH 4/4] omap: Make get_irqnr_and_base common for mach-omap2 multiboot Tony Lindgren 2010-01-16 1:35 ` Tony Lindgren 2010-01-16 11:24 ` Shilimkar, Santosh 2010-01-16 11:24 ` Shilimkar, Santosh 2010-01-16 11:55 ` Russell King - ARM Linux 2010-01-16 11:55 ` Russell King - ARM Linux 2010-01-16 19:12 ` Tony Lindgren 2010-01-16 19:12 ` Tony Lindgren 2010-01-22 20:39 ` [PATCH 4/4] omap: Make get_irqnr_and_base common for mach-omap2 multiboot, v2 Tony Lindgren 2010-01-22 20:39 ` Tony Lindgren 2010-01-22 20:56 ` Russell King - ARM Linux 2010-01-22 20:56 ` Russell King - ARM Linux 2010-01-22 21:09 ` Tony Lindgren 2010-01-22 21:09 ` Tony Lindgren 2010-01-22 21:16 ` Tony Lindgren 2010-01-22 21:16 ` Tony Lindgren 2010-01-16 20:15 ` [PATCH 0/4] omap multiboot improvments for merge window after 2.6.34 Tony Lindgren 2010-01-16 20:15 ` Tony Lindgren
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