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Date: Tue, 30 Aug 2005 00:53:38 -0300
From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: Jeff Garzik <jgarzik@pobox.com>
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Cc: Russell King <rmk+lkml@arm.linux.org.uk>, linux-kernel@vger.kernel.org,
	linux-ppc-embedded <linuxppc-embedded@ozlabs.org>
Subject: Re: [PATCH] MPC8xx PCMCIA driver
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On Mon, Aug 29, 2005 at 11:39:02PM -0400, Jeff Garzik wrote:
> Marcelo Tosatti wrote:
> >+static int voltage_set(int slot, int vcc, int vpp)
> >+{
> >+	u_int reg = 0;
> >+
> >+	switch(vcc) {
> >+	case 0: break;
> >+	case 33:
> >+		reg |= BCSR1_PCVCTL4;
> >+		break;
> >+	case 50: 
> >+		reg |= BCSR1_PCVCTL5;
> >+		break;
> >+	default: 
> >+		return 1;
> >+	}
> >+
> >+	switch(vpp) {
> >+	case 0: break;
> >+	case 33: 
> >+	case 50:
> >+		if(vcc == vpp)
> >+			reg |= BCSR1_PCVCTL6;
> >+		else
> >+			return 1;
> >+		break;
> >+	case 120: 
> >+		reg |= BCSR1_PCVCTL7;
> >+	default:
> >+		return 1;
> >+	}
> >+
> >+	if(!((vcc == 50) || (vcc == 0)))
> >+		return 1;
> >+
> >+	/* first, turn off all power */
> >+
> >+	*((uint *)RPX_CSR_ADDR) &= ~(BCSR1_PCVCTL4 | BCSR1_PCVCTL5
> >+				     | BCSR1_PCVCTL6 | BCSR1_PCVCTL7);
> >+
> >+	/* enable new powersettings */
> >+
> >+	*((uint *)RPX_CSR_ADDR) |= reg;
> 
> Should use bus read/write functions, such as foo_readl() or iowrite32().

The memory map structure which contains device configuration/registers
is _always_ directly mapped with pte's (the 8xx is a chip with builtin
UART/network/etc functionality).

I don't think there is a need to use read/write acessors.

> Don't use weird types in kernel code such as 'uint'.  Use the more 
> explicitly-sized u32.

OK, will fix the types and address the rest of your comments.

Thanks!