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ARM: 6244/1: mmci: add variant data and default MCICLOCK support
Add a variant_data structure to handle the differences between the various variants of this peripheral. Add a first quirk for a default MCICLOCK value, required on the Ux500 variant where the enable bit needs to be always set, since it controls access to some registers. Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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2 changed files with 32 additions and 1 deletions
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@ -36,12 +36,30 @@
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static unsigned int fmax = 515633;
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/**
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* struct variant_data - MMCI variant-specific quirks
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* @clkreg: default value for MCICLOCK register
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*/
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struct variant_data {
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unsigned int clkreg;
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};
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static struct variant_data variant_arm = {
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};
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static struct variant_data variant_u300 = {
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};
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static struct variant_data variant_ux500 = {
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.clkreg = MCI_CLK_ENABLE,
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};
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/*
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* This must be called with host->lock held
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*/
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static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
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{
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u32 clk = 0;
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struct variant_data *variant = host->variant;
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u32 clk = variant->clkreg;
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if (desired) {
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if (desired >= host->mclk) {
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@ -563,6 +581,7 @@ static const struct mmc_host_ops mmci_ops = {
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static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
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{
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struct mmci_platform_data *plat = dev->dev.platform_data;
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struct variant_data *variant = id->data;
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struct mmci_host *host;
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struct mmc_host *mmc;
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int ret;
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@ -606,6 +625,7 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
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goto clk_free;
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host->plat = plat;
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host->variant = variant;
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host->mclk = clk_get_rate(host->clk);
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/*
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* According to the spec, mclk is max 100 MHz,
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@ -845,19 +865,28 @@ static struct amba_id mmci_ids[] = {
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{
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.id = 0x00041180,
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.mask = 0x000fffff,
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.data = &variant_arm,
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},
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{
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.id = 0x00041181,
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.mask = 0x000fffff,
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.data = &variant_arm,
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},
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/* ST Micro variants */
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{
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.id = 0x00180180,
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.mask = 0x00ffffff,
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.data = &variant_u300,
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},
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{
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.id = 0x00280180,
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.mask = 0x00ffffff,
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.data = &variant_u300,
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},
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{
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.id = 0x00480180,
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.mask = 0x00ffffff,
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.data = &variant_ux500,
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},
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{ 0, 0 },
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};
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@ -145,6 +145,7 @@
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#define NR_SG 16
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struct clk;
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struct variant_data;
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struct mmci_host {
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void __iomem *base;
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@ -164,6 +165,7 @@ struct mmci_host {
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unsigned int cclk;
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u32 pwr;
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struct mmci_platform_data *plat;
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struct variant_data *variant;
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u8 hw_designer;
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u8 hw_revision:4;
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