On 23/10/07 21:39 -0600, Grant Likely wrote:
> From: Grant Likely <[email protected]>
>
> port_config and the cdm are the responsibility of firmware; and if
> firmware doesn't set it up correctly, it should be fixed up by
> platform code on a per-board basis because it's a property of the
> board.
>
> Drivers should never touch these registers. They are completely
> unprotected and the platform may do odd things with them that the
> driver must not interfere with.
>
> Signed-off-by: Grant Likely <[email protected]>
> ---
>
> Domen, Dragos; can you please check your usage of this driver. None of
> the in-tree board ports use it as-is, but they are of course just a
> device tree change away from being usable on the lite5200b.
My test cases were just a jumper on RX-TX line.
It's not even allowed to set mclken_div_pscX?
There can be different speed devices on same SPI
(spi_board_info->max_speed_hz).
>
> Board ports that use it need to be modified to make the cdm/port_config
> changes in firmware (prefered) or in arch/powerpc/platforms/52xx/<board>.c
>
> Cheers,
> g.
>
> drivers/spi/mpc52xx_psc_spi.c | 77 +----------------------------------------
> 1 files changed, 2 insertions(+), 75 deletions(-)
>
> diff --git a/drivers/spi/mpc52xx_psc_spi.c b/drivers/spi/mpc52xx_psc_spi.c
> index 7051e6c..ec3a618 100644
> --- a/drivers/spi/mpc52xx_psc_spi.c
> +++ b/drivers/spi/mpc52xx_psc_spi.c
> @@ -328,78 +328,15 @@ static void mpc52xx_psc_spi_cleanup(struct spi_device *spi)
> kfree(spi->controller_state);
> }
>
> -static int mpc52xx_psc_spi_port_config(int psc_id, struct mpc52xx_psc_spi *mps)
> +static void mpc52xx_psc_spi_config(int psc_id, struct mpc52xx_psc_spi *mps)
> {
> - struct mpc52xx_cdm __iomem *cdm;
> - struct mpc52xx_gpio __iomem *gpio;
> struct mpc52xx_psc __iomem *psc = mps->psc;
> - u32 ul;
> u32 mclken_div;
> - int ret = 0;
> -
> -#if defined(CONFIG_PPC_MERGE)
> - cdm = mpc52xx_find_and_map("mpc5200-cdm");
> - gpio = mpc52xx_find_and_map("mpc5200-gpio");
> -#else
> - cdm = ioremap(MPC52xx_PA(MPC52xx_CDM_OFFSET), MPC52xx_CDM_SIZE);
> - gpio = ioremap(MPC52xx_PA(MPC52xx_GPIO_OFFSET), MPC52xx_GPIO_SIZE);
> -#endif
> - if (!cdm || !gpio) {
> - printk(KERN_ERR "Error mapping CDM/GPIO\n");
> - ret = -EFAULT;
> - goto unmap_regs;
> - }
>
> /* default sysclk is 512MHz */
> mclken_div = 0x8000 |
> (((mps->sysclk ? mps->sysclk : 512000000) / MCLK) & 0x1FF);
It's actually 528e6, and mclken_div doesn't seem to be used anywhere anymore.
>
> - switch (psc_id) {
> - case 1:
...
Domen
-
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